| /* | |
| * copyright (c) 2001 Fabrice Bellard | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /** | |
| * @file | |
| * @ingroup libavc | |
| * Libavcodec external API header | |
| */ | |
| /* When included as part of the ffmpeg build, only include the major version | |
| * to avoid unnecessary rebuilds. When included externally, keep including | |
| * the full version information. */ | |
| /** | |
| * @defgroup libavc libavcodec | |
| * Encoding/Decoding Library | |
| * | |
| * @{ | |
| * | |
| * @defgroup lavc_decoding Decoding | |
| * @{ | |
| * @} | |
| * | |
| * @defgroup lavc_encoding Encoding | |
| * @{ | |
| * @} | |
| * | |
| * @defgroup lavc_codec Codecs | |
| * @{ | |
| * @defgroup lavc_codec_native Native Codecs | |
| * @{ | |
| * @} | |
| * @defgroup lavc_codec_wrappers External library wrappers | |
| * @{ | |
| * @} | |
| * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge | |
| * @{ | |
| * @} | |
| * @} | |
| * @defgroup lavc_internal Internal | |
| * @{ | |
| * @} | |
| * @} | |
| */ | |
| /** | |
| * @ingroup libavc | |
| * @defgroup lavc_encdec send/receive encoding and decoding API overview | |
| * @{ | |
| * | |
| * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/ | |
| * avcodec_receive_packet() functions provide an encode/decode API, which | |
| * decouples input and output. | |
| * | |
| * The API is very similar for encoding/decoding and audio/video, and works as | |
| * follows: | |
| * - Set up and open the AVCodecContext as usual. | |
| * - Send valid input: | |
| * - For decoding, call avcodec_send_packet() to give the decoder raw | |
| * compressed data in an AVPacket. | |
| * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame | |
| * containing uncompressed audio or video. | |
| * | |
| * In both cases, it is recommended that AVPackets and AVFrames are | |
| * refcounted, or libavcodec might have to copy the input data. (libavformat | |
| * always returns refcounted AVPackets, and av_frame_get_buffer() allocates | |
| * refcounted AVFrames.) | |
| * - Receive output in a loop. Periodically call one of the avcodec_receive_*() | |
| * functions and process their output: | |
| * - For decoding, call avcodec_receive_frame(). On success, it will return | |
| * an AVFrame containing uncompressed audio or video data. | |
| * - For encoding, call avcodec_receive_packet(). On success, it will return | |
| * an AVPacket with a compressed frame. | |
| * | |
| * Repeat this call until it returns AVERROR(EAGAIN) or an error. The | |
| * AVERROR(EAGAIN) return value means that new input data is required to | |
| * return new output. In this case, continue with sending input. For each | |
| * input frame/packet, the codec will typically return 1 output frame/packet, | |
| * but it can also be 0 or more than 1. | |
| * | |
| * At the beginning of decoding or encoding, the codec might accept multiple | |
| * input frames/packets without returning a frame, until its internal buffers | |
| * are filled. This situation is handled transparently if you follow the steps | |
| * outlined above. | |
| * | |
| * In theory, sending input can result in EAGAIN - this should happen only if | |
| * not all output was received. You can use this to structure alternative decode | |
| * or encode loops other than the one suggested above. For example, you could | |
| * try sending new input on each iteration, and try to receive output if that | |
| * returns EAGAIN. | |
| * | |
| * End of stream situations. These require "flushing" (aka draining) the codec, | |
| * as the codec might buffer multiple frames or packets internally for | |
| * performance or out of necessity (consider B-frames). | |
| * This is handled as follows: | |
| * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding) | |
| * or avcodec_send_frame() (encoding) functions. This will enter draining | |
| * mode. | |
| * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet() | |
| * (encoding) in a loop until AVERROR_EOF is returned. The functions will | |
| * not return AVERROR(EAGAIN), unless you forgot to enter draining mode. | |
| * - Before decoding can be resumed again, the codec has to be reset with | |
| * avcodec_flush_buffers(). | |
| * | |
| * Using the API as outlined above is highly recommended. But it is also | |
| * possible to call functions outside of this rigid schema. For example, you can | |
| * call avcodec_send_packet() repeatedly without calling | |
| * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed | |
| * until the codec's internal buffer has been filled up (which is typically of | |
| * size 1 per output frame, after initial input), and then reject input with | |
| * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to | |
| * read at least some output. | |
| * | |
| * Not all codecs will follow a rigid and predictable dataflow; the only | |
| * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on | |
| * one end implies that a receive/send call on the other end will succeed, or | |
| * at least will not fail with AVERROR(EAGAIN). In general, no codec will | |
| * permit unlimited buffering of input or output. | |
| * | |
| * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This | |
| * would be an invalid state, which could put the codec user into an endless | |
| * loop. The API has no concept of time either: it cannot happen that trying to | |
| * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second | |
| * later accepts the packet (with no other receive/flush API calls involved). | |
| * The API is a strict state machine, and the passage of time is not supposed | |
| * to influence it. Some timing-dependent behavior might still be deemed | |
| * acceptable in certain cases. But it must never result in both send/receive | |
| * returning EAGAIN at the same time at any point. It must also absolutely be | |
| * avoided that the current state is "unstable" and can "flip-flop" between | |
| * the send/receive APIs allowing progress. For example, it's not allowed that | |
| * the codec randomly decides that it actually wants to consume a packet now | |
| * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an | |
| * avcodec_send_packet() call. | |
| * @} | |
| */ | |
| /** | |
| * @defgroup lavc_core Core functions/structures. | |
| * @ingroup libavc | |
| * | |
| * Basic definitions, functions for querying libavcodec capabilities, | |
| * allocating core structures, etc. | |
| * @{ | |
| */ | |
| /** | |
| * @ingroup lavc_encoding | |
| * minimum encoding buffer size | |
| * Used to avoid some checks during header writing. | |
| */ | |
| /** | |
| * @ingroup lavc_encoding | |
| */ | |
| typedef struct RcOverride{ | |
| int start_frame; | |
| int end_frame; | |
| int qscale; // If this is 0 then quality_factor will be used instead. | |
| float quality_factor; | |
| } RcOverride; | |
| /* encoding support | |
| These flags can be passed in AVCodecContext.flags before initialization. | |
| Note: Not everything is supported yet. | |
| */ | |
| /** | |
| * Allow decoders to produce frames with data planes that are not aligned | |
| * to CPU requirements (e.g. due to cropping). | |
| */ | |
| /** | |
| * Use fixed qscale. | |
| */ | |
| /** | |
| * 4 MV per MB allowed / advanced prediction for H.263. | |
| */ | |
| /** | |
| * Output even those frames that might be corrupted. | |
| */ | |
| /** | |
| * Use qpel MC. | |
| */ | |
| /** | |
| * Don't output frames whose parameters differ from first | |
| * decoded frame in stream. | |
| * | |
| * @deprecated callers should implement this functionality in their own code | |
| */ | |
| /** | |
| * Request the encoder to output reconstructed frames, i.e.\ frames that would | |
| * be produced by decoding the encoded bistream. These frames may be retrieved | |
| * by calling avcodec_receive_frame() immediately after a successful call to | |
| * avcodec_receive_packet(). | |
| * | |
| * Should only be used with encoders flagged with the | |
| * @ref AV_CODEC_CAP_ENCODER_RECON_FRAME capability. | |
| * | |
| * @note | |
| * Each reconstructed frame returned by the encoder corresponds to the last | |
| * encoded packet, i.e. the frames are returned in coded order rather than | |
| * presentation order. | |
| * | |
| * @note | |
| * Frame parameters (like pixel format or dimensions) do not have to match the | |
| * AVCodecContext values. Make sure to use the values from the returned frame. | |
| */ | |
| /** | |
| * @par decoding | |
| * Request the decoder to propagate each packet's AVPacket.opaque and | |
| * AVPacket.opaque_ref to its corresponding output AVFrame. | |
| * | |
| * @par encoding: | |
| * Request the encoder to propagate each frame's AVFrame.opaque and | |
| * AVFrame.opaque_ref values to its corresponding output AVPacket. | |
| * | |
| * @par | |
| * May only be set on encoders that have the | |
| * @ref AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability flag. | |
| * | |
| * @note | |
| * While in typical cases one input frame produces exactly one output packet | |
| * (perhaps after a delay), in general the mapping of frames to packets is | |
| * M-to-N, so | |
| * - Any number of input frames may be associated with any given output packet. | |
| * This includes zero - e.g. some encoders may output packets that carry only | |
| * metadata about the whole stream. | |
| * - A given input frame may be associated with any number of output packets. | |
| * Again this includes zero - e.g. some encoders may drop frames under certain | |
| * conditions. | |
| * . | |
| * This implies that when using this flag, the caller must NOT assume that | |
| * - a given input frame's opaques will necessarily appear on some output packet; | |
| * - every output packet will have some non-NULL opaque value. | |
| * . | |
| * When an output packet contains multiple frames, the opaque values will be | |
| * taken from the first of those. | |
| * | |
| * @note | |
| * The converse holds for decoders, with frames and packets switched. | |
| */ | |
| /** | |
| * Signal to the encoder that the values of AVFrame.duration are valid and | |
| * should be used (typically for transferring them to output packets). | |
| * | |
| * If this flag is not set, frame durations are ignored. | |
| */ | |
| /** | |
| * Use internal 2pass ratecontrol in first pass mode. | |
| */ | |
| /** | |
| * Use internal 2pass ratecontrol in second pass mode. | |
| */ | |
| /** | |
| * loop filter. | |
| */ | |
| /** | |
| * Only decode/encode grayscale. | |
| */ | |
| /** | |
| * error[?] variables will be set during encoding. | |
| */ | |
| /** | |
| * Use interlaced DCT. | |
| */ | |
| /** | |
| * Force low delay. | |
| */ | |
| /** | |
| * Place global headers in extradata instead of every keyframe. | |
| */ | |
| /** | |
| * Use only bitexact stuff (except (I)DCT). | |
| */ | |
| /* Fx : Flag for H.263+ extra options */ | |
| /** | |
| * H.263 advanced intra coding / MPEG-4 AC prediction | |
| */ | |
| /** | |
| * interlaced motion estimation | |
| */ | |
| /** | |
| * Allow non spec compliant speedup tricks. | |
| */ | |
| /** | |
| * Skip bitstream encoding. | |
| */ | |
| /** | |
| * Place global headers at every keyframe instead of in extradata. | |
| */ | |
| /** | |
| * Input bitstream might be truncated at a packet boundaries | |
| * instead of only at frame boundaries. | |
| */ | |
| /** | |
| * Discard cropping information from SPS. | |
| */ | |
| /** | |
| * Show all frames before the first keyframe | |
| */ | |
| /** | |
| * Export motion vectors through frame side data | |
| */ | |
| /** | |
| * Do not skip samples and export skip information as frame side data | |
| */ | |
| /** | |
| * Do not reset ASS ReadOrder field on flush (subtitles decoding) | |
| */ | |
| /** | |
| * Generate/parse ICC profiles on encode/decode, as appropriate for the type of | |
| * file. No effect on codecs which cannot contain embedded ICC profiles, or | |
| * when compiled without support for lcms2. | |
| */ | |
| /* Exported side data. | |
| These flags can be passed in AVCodecContext.export_side_data before initialization. | |
| */ | |
| /** | |
| * Export motion vectors through frame side data | |
| */ | |
| /** | |
| * Export encoder Producer Reference Time through packet side data | |
| */ | |
| /** | |
| * Decoding only. | |
| * Export the AVVideoEncParams structure through frame side data. | |
| */ | |
| /** | |
| * Decoding only. | |
| * Do not apply film grain, export it instead. | |
| */ | |
| /** | |
| * The decoder will keep a reference to the frame and may reuse it later. | |
| */ | |
| /** | |
| * The encoder will keep a reference to the packet and may reuse it later. | |
| */ | |
| /** | |
| * main external API structure. | |
| * New fields can be added to the end with minor version bumps. | |
| * Removal, reordering and changes to existing fields require a major | |
| * version bump. | |
| * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user | |
| * applications. | |
| * The name string for AVOptions options matches the associated command line | |
| * parameter name and can be found in libavcodec/options_table.h | |
| * The AVOption/command line parameter names differ in some cases from the C | |
| * structure field names for historic reasons or brevity. | |
| * sizeof(AVCodecContext) must not be used outside libav*. | |
| */ | |
| typedef struct AVCodecContext { | |
| /** | |
| * information on struct for av_log | |
| * - set by avcodec_alloc_context3 | |
| */ | |
| const AVClass *av_class; | |
| int log_level_offset; | |
| enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */ | |
| const struct AVCodec *codec; | |
| enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */ | |
| /** | |
| * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). | |
| * This is used to work around some encoder bugs. | |
| * A demuxer should set this to what is stored in the field used to identify the codec. | |
| * If there are multiple such fields in a container then the demuxer should choose the one | |
| * which maximizes the information about the used codec. | |
| * If the codec tag field in a container is larger than 32 bits then the demuxer should | |
| * remap the longer ID to 32 bits with a table or other structure. Alternatively a new | |
| * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated | |
| * first. | |
| * - encoding: Set by user, if not then the default based on codec_id will be used. | |
| * - decoding: Set by user, will be converted to uppercase by libavcodec during init. | |
| */ | |
| unsigned int codec_tag; | |
| void *priv_data; | |
| /** | |
| * Private context used for internal data. | |
| * | |
| * Unlike priv_data, this is not codec-specific. It is used in general | |
| * libavcodec functions. | |
| */ | |
| struct AVCodecInternal *internal; | |
| /** | |
| * Private data of the user, can be used to carry app specific stuff. | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| */ | |
| void *opaque; | |
| /** | |
| * the average bitrate | |
| * - encoding: Set by user; unused for constant quantizer encoding. | |
| * - decoding: Set by user, may be overwritten by libavcodec | |
| * if this info is available in the stream | |
| */ | |
| int64_t bit_rate; | |
| /** | |
| * number of bits the bitstream is allowed to diverge from the reference. | |
| * the reference can be CBR (for CBR pass1) or VBR (for pass2) | |
| * - encoding: Set by user; unused for constant quantizer encoding. | |
| * - decoding: unused | |
| */ | |
| int bit_rate_tolerance; | |
| /** | |
| * Global quality for codecs which cannot change it per frame. | |
| * This should be proportional to MPEG-1/2/4 qscale. | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int global_quality; | |
| /** | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int compression_level; | |
| /** | |
| * AV_CODEC_FLAG_*. | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| */ | |
| int flags; | |
| /** | |
| * AV_CODEC_FLAG2_* | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| */ | |
| int flags2; | |
| /** | |
| * some codecs need / can use extradata like Huffman tables. | |
| * MJPEG: Huffman tables | |
| * rv10: additional flags | |
| * MPEG-4: global headers (they can be in the bitstream or here) | |
| * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger | |
| * than extradata_size to avoid problems if it is read with the bitstream reader. | |
| * The bytewise contents of extradata must not depend on the architecture or CPU endianness. | |
| * Must be allocated with the av_malloc() family of functions. | |
| * - encoding: Set/allocated/freed by libavcodec. | |
| * - decoding: Set/allocated/freed by user. | |
| */ | |
| uint8_t *extradata; | |
| int extradata_size; | |
| /** | |
| * This is the fundamental unit of time (in seconds) in terms | |
| * of which frame timestamps are represented. For fixed-fps content, | |
| * timebase should be 1/framerate and timestamp increments should be | |
| * identically 1. | |
| * This often, but not always is the inverse of the frame rate or field rate | |
| * for video. 1/time_base is not the average frame rate if the frame rate is not | |
| * constant. | |
| * | |
| * Like containers, elementary streams also can store timestamps, 1/time_base | |
| * is the unit in which these timestamps are specified. | |
| * As example of such codec time base see ISO/IEC 14496-2:2001(E) | |
| * vop_time_increment_resolution and fixed_vop_rate | |
| * (fixed_vop_rate == 0 implies that it is different from the framerate) | |
| * | |
| * - encoding: MUST be set by user. | |
| * - decoding: unused. | |
| */ | |
| AVRational time_base; | |
| /** | |
| * For some codecs, the time base is closer to the field rate than the frame rate. | |
| * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration | |
| * if no telecine is used ... | |
| * | |
| * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2. | |
| * | |
| * @deprecated | |
| * - decoding: Use AVCodecDescriptor.props & AV_CODEC_PROP_FIELDS | |
| * - encoding: Set AVCodecContext.framerate instead | |
| * | |
| */ | |
| attribute_deprecated | |
| int ticks_per_frame; | |
| /** | |
| * Codec delay. | |
| * | |
| * Encoding: Number of frames delay there will be from the encoder input to | |
| * the decoder output. (we assume the decoder matches the spec) | |
| * Decoding: Number of frames delay in addition to what a standard decoder | |
| * as specified in the spec would produce. | |
| * | |
| * Video: | |
| * Number of frames the decoded output will be delayed relative to the | |
| * encoded input. | |
| * | |
| * Audio: | |
| * For encoding, this field is unused (see initial_padding). | |
| * | |
| * For decoding, this is the number of samples the decoder needs to | |
| * output before the decoder's output is valid. When seeking, you should | |
| * start decoding this many samples prior to your desired seek point. | |
| * | |
| * - encoding: Set by libavcodec. | |
| * - decoding: Set by libavcodec. | |
| */ | |
| int delay; | |
| /* video only */ | |
| /** | |
| * picture width / height. | |
| * | |
| * @note Those fields may not match the values of the last | |
| * AVFrame output by avcodec_receive_frame() due frame | |
| * reordering. | |
| * | |
| * - encoding: MUST be set by user. | |
| * - decoding: May be set by the user before opening the decoder if known e.g. | |
| * from the container. Some decoders will require the dimensions | |
| * to be set by the caller. During decoding, the decoder may | |
| * overwrite those values as required while parsing the data. | |
| */ | |
| int width, height; | |
| /** | |
| * Bitstream width / height, may be different from width/height e.g. when | |
| * the decoded frame is cropped before being output or lowres is enabled. | |
| * | |
| * @note Those field may not match the value of the last | |
| * AVFrame output by avcodec_receive_frame() due frame | |
| * reordering. | |
| * | |
| * - encoding: unused | |
| * - decoding: May be set by the user before opening the decoder if known | |
| * e.g. from the container. During decoding, the decoder may | |
| * overwrite those values as required while parsing the data. | |
| */ | |
| int coded_width, coded_height; | |
| /** | |
| * the number of pictures in a group of pictures, or 0 for intra_only | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int gop_size; | |
| /** | |
| * Pixel format, see AV_PIX_FMT_xxx. | |
| * May be set by the demuxer if known from headers. | |
| * May be overridden by the decoder if it knows better. | |
| * | |
| * @note This field may not match the value of the last | |
| * AVFrame output by avcodec_receive_frame() due frame | |
| * reordering. | |
| * | |
| * - encoding: Set by user. | |
| * - decoding: Set by user if known, overridden by libavcodec while | |
| * parsing the data. | |
| */ | |
| enum AVPixelFormat pix_fmt; | |
| /** | |
| * If non NULL, 'draw_horiz_band' is called by the libavcodec | |
| * decoder to draw a horizontal band. It improves cache usage. Not | |
| * all codecs can do that. You must check the codec capabilities | |
| * beforehand. | |
| * When multithreading is used, it may be called from multiple threads | |
| * at the same time; threads might draw different parts of the same AVFrame, | |
| * or multiple AVFrames, and there is no guarantee that slices will be drawn | |
| * in order. | |
| * The function is also used by hardware acceleration APIs. | |
| * It is called at least once during frame decoding to pass | |
| * the data needed for hardware render. | |
| * In that mode instead of pixel data, AVFrame points to | |
| * a structure specific to the acceleration API. The application | |
| * reads the structure and can change some fields to indicate progress | |
| * or mark state. | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| * @param height the height of the slice | |
| * @param y the y position of the slice | |
| * @param type 1->top field, 2->bottom field, 3->frame | |
| * @param offset offset into the AVFrame.data from which the slice should be read | |
| */ | |
| void (*draw_horiz_band)(struct AVCodecContext *s, | |
| const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], | |
| int y, int type, int height); | |
| /** | |
| * Callback to negotiate the pixel format. Decoding only, may be set by the | |
| * caller before avcodec_open2(). | |
| * | |
| * Called by some decoders to select the pixel format that will be used for | |
| * the output frames. This is mainly used to set up hardware acceleration, | |
| * then the provided format list contains the corresponding hwaccel pixel | |
| * formats alongside the "software" one. The software pixel format may also | |
| * be retrieved from \ref sw_pix_fmt. | |
| * | |
| * This callback will be called when the coded frame properties (such as | |
| * resolution, pixel format, etc.) change and more than one output format is | |
| * supported for those new properties. If a hardware pixel format is chosen | |
| * and initialization for it fails, the callback may be called again | |
| * immediately. | |
| * | |
| * This callback may be called from different threads if the decoder is | |
| * multi-threaded, but not from more than one thread simultaneously. | |
| * | |
| * @param fmt list of formats which may be used in the current | |
| * configuration, terminated by AV_PIX_FMT_NONE. | |
| * @warning Behavior is undefined if the callback returns a value other | |
| * than one of the formats in fmt or AV_PIX_FMT_NONE. | |
| * @return the chosen format or AV_PIX_FMT_NONE | |
| */ | |
| enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt); | |
| /** | |
| * maximum number of B-frames between non-B-frames | |
| * Note: The output will be delayed by max_b_frames+1 relative to the input. | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int max_b_frames; | |
| /** | |
| * qscale factor between IP and B-frames | |
| * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset). | |
| * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float b_quant_factor; | |
| /** | |
| * qscale offset between IP and B-frames | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float b_quant_offset; | |
| /** | |
| * Size of the frame reordering buffer in the decoder. | |
| * For MPEG-2 it is 1 IPB or 0 low delay IP. | |
| * - encoding: Set by libavcodec. | |
| * - decoding: Set by libavcodec. | |
| */ | |
| int has_b_frames; | |
| /** | |
| * qscale factor between P- and I-frames | |
| * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset). | |
| * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float i_quant_factor; | |
| /** | |
| * qscale offset between P and I-frames | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float i_quant_offset; | |
| /** | |
| * luminance masking (0-> disabled) | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float lumi_masking; | |
| /** | |
| * temporary complexity masking (0-> disabled) | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float temporal_cplx_masking; | |
| /** | |
| * spatial complexity masking (0-> disabled) | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float spatial_cplx_masking; | |
| /** | |
| * p block masking (0-> disabled) | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float p_masking; | |
| /** | |
| * darkness masking (0-> disabled) | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| float dark_masking; | |
| /** | |
| * slice count | |
| * - encoding: Set by libavcodec. | |
| * - decoding: Set by user (or 0). | |
| */ | |
| attribute_deprecated | |
| int slice_count; | |
| /** | |
| * slice offsets in the frame in bytes | |
| * - encoding: Set/allocated by libavcodec. | |
| * - decoding: Set/allocated by user (or NULL). | |
| */ | |
| attribute_deprecated | |
| int *slice_offset; | |
| /** | |
| * sample aspect ratio (0 if unknown) | |
| * That is the width of a pixel divided by the height of the pixel. | |
| * Numerator and denominator must be relatively prime and smaller than 256 for some video standards. | |
| * - encoding: Set by user. | |
| * - decoding: Set by libavcodec. | |
| */ | |
| AVRational sample_aspect_ratio; | |
| /** | |
| * motion estimation comparison function | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int me_cmp; | |
| /** | |
| * subpixel motion estimation comparison function | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int me_sub_cmp; | |
| /** | |
| * macroblock comparison function (not supported yet) | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int mb_cmp; | |
| /** | |
| * interlaced DCT comparison function | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int ildct_cmp; | |
| /** | |
| * ME diamond size & shape | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int dia_size; | |
| /** | |
| * amount of previous MV predictors (2a+1 x 2a+1 square) | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int last_predictor_count; | |
| /** | |
| * motion estimation prepass comparison function | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int me_pre_cmp; | |
| /** | |
| * ME prepass diamond size & shape | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int pre_dia_size; | |
| /** | |
| * subpel ME quality | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int me_subpel_quality; | |
| /** | |
| * maximum motion estimation search range in subpel units | |
| * If 0 then no limit. | |
| * | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int me_range; | |
| /** | |
| * slice flags | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| */ | |
| int slice_flags; | |
| /** | |
| * macroblock decision mode | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int mb_decision; | |
| /** | |
| * custom intra quantization matrix | |
| * Must be allocated with the av_malloc() family of functions, and will be freed in | |
| * avcodec_free_context(). | |
| * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL. | |
| * - decoding: Set/allocated/freed by libavcodec. | |
| */ | |
| uint16_t *intra_matrix; | |
| /** | |
| * custom inter quantization matrix | |
| * Must be allocated with the av_malloc() family of functions, and will be freed in | |
| * avcodec_free_context(). | |
| * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL. | |
| * - decoding: Set/allocated/freed by libavcodec. | |
| */ | |
| uint16_t *inter_matrix; | |
| /** | |
| * precision of the intra DC coefficient - 8 | |
| * - encoding: Set by user. | |
| * - decoding: Set by libavcodec | |
| */ | |
| int intra_dc_precision; | |
| /** | |
| * Number of macroblock rows at the top which are skipped. | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| */ | |
| int skip_top; | |
| /** | |
| * Number of macroblock rows at the bottom which are skipped. | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| */ | |
| int skip_bottom; | |
| /** | |
| * minimum MB Lagrange multiplier | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int mb_lmin; | |
| /** | |
| * maximum MB Lagrange multiplier | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int mb_lmax; | |
| /** | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int bidir_refine; | |
| /** | |
| * minimum GOP size | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int keyint_min; | |
| /** | |
| * number of reference frames | |
| * - encoding: Set by user. | |
| * - decoding: Set by lavc. | |
| */ | |
| int refs; | |
| /** | |
| * Note: Value depends upon the compare function used for fullpel ME. | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int mv0_threshold; | |
| /** | |
| * Chromaticity coordinates of the source primaries. | |
| * - encoding: Set by user | |
| * - decoding: Set by libavcodec | |
| */ | |
| enum AVColorPrimaries color_primaries; | |
| /** | |
| * Color Transfer Characteristic. | |
| * - encoding: Set by user | |
| * - decoding: Set by libavcodec | |
| */ | |
| enum AVColorTransferCharacteristic color_trc; | |
| /** | |
| * YUV colorspace type. | |
| * - encoding: Set by user | |
| * - decoding: Set by libavcodec | |
| */ | |
| enum AVColorSpace colorspace; | |
| /** | |
| * MPEG vs JPEG YUV range. | |
| * - encoding: Set by user to override the default output color range value, | |
| * If not specified, libavcodec sets the color range depending on the | |
| * output format. | |
| * - decoding: Set by libavcodec, can be set by the user to propagate the | |
| * color range to components reading from the decoder context. | |
| */ | |
| enum AVColorRange color_range; | |
| /** | |
| * This defines the location of chroma samples. | |
| * - encoding: Set by user | |
| * - decoding: Set by libavcodec | |
| */ | |
| enum AVChromaLocation chroma_sample_location; | |
| /** | |
| * Number of slices. | |
| * Indicates number of picture subdivisions. Used for parallelized | |
| * decoding. | |
| * - encoding: Set by user | |
| * - decoding: unused | |
| */ | |
| int slices; | |
| /** Field order | |
| * - encoding: set by libavcodec | |
| * - decoding: Set by user. | |
| */ | |
| enum AVFieldOrder field_order; | |
| /* audio only */ | |
| int sample_rate; ///< samples per second | |
| /** | |
| * number of audio channels | |
| * @deprecated use ch_layout.nb_channels | |
| */ | |
| attribute_deprecated | |
| int channels; | |
| /** | |
| * audio sample format | |
| * - encoding: Set by user. | |
| * - decoding: Set by libavcodec. | |
| */ | |
| enum AVSampleFormat sample_fmt; ///< sample format | |
| /* The following data should not be initialized. */ | |
| /** | |
| * Number of samples per channel in an audio frame. | |
| * | |
| * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame | |
| * except the last must contain exactly frame_size samples per channel. | |
| * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the | |
| * frame size is not restricted. | |
| * - decoding: may be set by some decoders to indicate constant frame size | |
| */ | |
| int frame_size; | |
| /** | |
| * Frame counter, set by libavcodec. | |
| * | |
| * - decoding: total number of frames returned from the decoder so far. | |
| * - encoding: total number of frames passed to the encoder so far. | |
| * | |
| * @note the counter is not incremented if encoding/decoding resulted in | |
| * an error. | |
| * @deprecated use frame_num instead | |
| */ | |
| attribute_deprecated | |
| int frame_number; | |
| /** | |
| * number of bytes per packet if constant and known or 0 | |
| * Used by some WAV based audio codecs. | |
| */ | |
| int block_align; | |
| /** | |
| * Audio cutoff bandwidth (0 means "automatic") | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int cutoff; | |
| /** | |
| * Audio channel layout. | |
| * - encoding: set by user. | |
| * - decoding: set by user, may be overwritten by libavcodec. | |
| * @deprecated use ch_layout | |
| */ | |
| attribute_deprecated | |
| uint64_t channel_layout; | |
| /** | |
| * Request decoder to use this channel layout if it can (0 for default) | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| * @deprecated use "downmix" codec private option | |
| */ | |
| attribute_deprecated | |
| uint64_t request_channel_layout; | |
| /** | |
| * Type of service that the audio stream conveys. | |
| * - encoding: Set by user. | |
| * - decoding: Set by libavcodec. | |
| */ | |
| enum AVAudioServiceType audio_service_type; | |
| /** | |
| * desired sample format | |
| * - encoding: Not used. | |
| * - decoding: Set by user. | |
| * Decoder will decode to this format if it can. | |
| */ | |
| enum AVSampleFormat request_sample_fmt; | |
| /** | |
| * This callback is called at the beginning of each frame to get data | |
| * buffer(s) for it. There may be one contiguous buffer for all the data or | |
| * there may be a buffer per each data plane or anything in between. What | |
| * this means is, you may set however many entries in buf[] you feel necessary. | |
| * Each buffer must be reference-counted using the AVBuffer API (see description | |
| * of buf[] below). | |
| * | |
| * The following fields will be set in the frame before this callback is | |
| * called: | |
| * - format | |
| * - width, height (video only) | |
| * - sample_rate, channel_layout, nb_samples (audio only) | |
| * Their values may differ from the corresponding values in | |
| * AVCodecContext. This callback must use the frame values, not the codec | |
| * context values, to calculate the required buffer size. | |
| * | |
| * This callback must fill the following fields in the frame: | |
| * - data[] | |
| * - linesize[] | |
| * - extended_data: | |
| * * if the data is planar audio with more than 8 channels, then this | |
| * callback must allocate and fill extended_data to contain all pointers | |
| * to all data planes. data[] must hold as many pointers as it can. | |
| * extended_data must be allocated with av_malloc() and will be freed in | |
| * av_frame_unref(). | |
| * * otherwise extended_data must point to data | |
| * - buf[] must contain one or more pointers to AVBufferRef structures. Each of | |
| * the frame's data and extended_data pointers must be contained in these. That | |
| * is, one AVBufferRef for each allocated chunk of memory, not necessarily one | |
| * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(), | |
| * and av_buffer_ref(). | |
| * - extended_buf and nb_extended_buf must be allocated with av_malloc() by | |
| * this callback and filled with the extra buffers if there are more | |
| * buffers than buf[] can hold. extended_buf will be freed in | |
| * av_frame_unref(). | |
| * | |
| * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call | |
| * avcodec_default_get_buffer2() instead of providing buffers allocated by | |
| * some other means. | |
| * | |
| * Each data plane must be aligned to the maximum required by the target | |
| * CPU. | |
| * | |
| * @see avcodec_default_get_buffer2() | |
| * | |
| * Video: | |
| * | |
| * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused | |
| * (read and/or written to if it is writable) later by libavcodec. | |
| * | |
| * avcodec_align_dimensions2() should be used to find the required width and | |
| * height, as they normally need to be rounded up to the next multiple of 16. | |
| * | |
| * Some decoders do not support linesizes changing between frames. | |
| * | |
| * If frame multithreading is used, this callback may be called from a | |
| * different thread, but not from more than one at once. Does not need to be | |
| * reentrant. | |
| * | |
| * @see avcodec_align_dimensions2() | |
| * | |
| * Audio: | |
| * | |
| * Decoders request a buffer of a particular size by setting | |
| * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may, | |
| * however, utilize only part of the buffer by setting AVFrame.nb_samples | |
| * to a smaller value in the output frame. | |
| * | |
| * As a convenience, av_samples_get_buffer_size() and | |
| * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2() | |
| * functions to find the required data size and to fill data pointers and | |
| * linesize. In AVFrame.linesize, only linesize[0] may be set for audio | |
| * since all planes must be the same size. | |
| * | |
| * @see av_samples_get_buffer_size(), av_samples_fill_arrays() | |
| * | |
| * - encoding: unused | |
| * - decoding: Set by libavcodec, user can override. | |
| */ | |
| int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags); | |
| /* - encoding parameters */ | |
| float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0) | |
| float qblur; ///< amount of qscale smoothing over time (0.0-1.0) | |
| /** | |
| * minimum quantizer | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int qmin; | |
| /** | |
| * maximum quantizer | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int qmax; | |
| /** | |
| * maximum quantizer difference between frames | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int max_qdiff; | |
| /** | |
| * decoder bitstream buffer size | |
| * - encoding: Set by user. | |
| * - decoding: May be set by libavcodec. | |
| */ | |
| int rc_buffer_size; | |
| /** | |
| * ratecontrol override, see RcOverride | |
| * - encoding: Allocated/set/freed by user. | |
| * - decoding: unused | |
| */ | |
| int rc_override_count; | |
| RcOverride *rc_override; | |
| /** | |
| * maximum bitrate | |
| * - encoding: Set by user. | |
| * - decoding: Set by user, may be overwritten by libavcodec. | |
| */ | |
| int64_t rc_max_rate; | |
| /** | |
| * minimum bitrate | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int64_t rc_min_rate; | |
| /** | |
| * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow. | |
| * - encoding: Set by user. | |
| * - decoding: unused. | |
| */ | |
| float rc_max_available_vbv_use; | |
| /** | |
| * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow. | |
| * - encoding: Set by user. | |
| * - decoding: unused. | |
| */ | |
| float rc_min_vbv_overflow_use; | |
| /** | |
| * Number of bits which should be loaded into the rc buffer before decoding starts. | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int rc_initial_buffer_occupancy; | |
| /** | |
| * trellis RD quantization | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int trellis; | |
| /** | |
| * pass1 encoding statistics output buffer | |
| * - encoding: Set by libavcodec. | |
| * - decoding: unused | |
| */ | |
| char *stats_out; | |
| /** | |
| * pass2 encoding statistics input buffer | |
| * Concatenated stuff from stats_out of pass1 should be placed here. | |
| * - encoding: Allocated/set/freed by user. | |
| * - decoding: unused | |
| */ | |
| char *stats_in; | |
| /** | |
| * Work around bugs in encoders which sometimes cannot be detected automatically. | |
| * - encoding: Set by user | |
| * - decoding: Set by user | |
| */ | |
| int workaround_bugs; | |
| /** | |
| * strictly follow the standard (MPEG-4, ...). | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| * Setting this to STRICT or higher means the encoder and decoder will | |
| * generally do stupid things, whereas setting it to unofficial or lower | |
| * will mean the encoder might produce output that is not supported by all | |
| * spec-compliant decoders. Decoders don't differentiate between normal, | |
| * unofficial and experimental (that is, they always try to decode things | |
| * when they can) unless they are explicitly asked to behave stupidly | |
| * (=strictly conform to the specs) | |
| * This may only be set to one of the FF_COMPLIANCE_* values in defs.h. | |
| */ | |
| int strict_std_compliance; | |
| /** | |
| * error concealment flags | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| */ | |
| int error_concealment; | |
| /** | |
| * debug | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| */ | |
| int debug; | |
| /** | |
| * Error recognition; may misdetect some more or less valid parts as errors. | |
| * This is a bitfield of the AV_EF_* values defined in defs.h. | |
| * | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| */ | |
| int err_recognition; | |
| /** | |
| * opaque 64-bit number (generally a PTS) that will be reordered and | |
| * output in AVFrame.reordered_opaque | |
| * - encoding: Set by libavcodec to the reordered_opaque of the input | |
| * frame corresponding to the last returned packet. Only | |
| * supported by encoders with the | |
| * AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability. | |
| * - decoding: Set by user. | |
| * | |
| * @deprecated Use AV_CODEC_FLAG_COPY_OPAQUE instead | |
| */ | |
| attribute_deprecated | |
| int64_t reordered_opaque; | |
| /** | |
| * Hardware accelerator in use | |
| * - encoding: unused. | |
| * - decoding: Set by libavcodec | |
| */ | |
| const struct AVHWAccel *hwaccel; | |
| /** | |
| * Legacy hardware accelerator context. | |
| * | |
| * For some hardware acceleration methods, the caller may use this field to | |
| * signal hwaccel-specific data to the codec. The struct pointed to by this | |
| * pointer is hwaccel-dependent and defined in the respective header. Please | |
| * refer to the FFmpeg HW accelerator documentation to know how to fill | |
| * this. | |
| * | |
| * In most cases this field is optional - the necessary information may also | |
| * be provided to libavcodec through @ref hw_frames_ctx or @ref | |
| * hw_device_ctx (see avcodec_get_hw_config()). However, in some cases it | |
| * may be the only method of signalling some (optional) information. | |
| * | |
| * The struct and its contents are owned by the caller. | |
| * | |
| * - encoding: May be set by the caller before avcodec_open2(). Must remain | |
| * valid until avcodec_free_context(). | |
| * - decoding: May be set by the caller in the get_format() callback. | |
| * Must remain valid until the next get_format() call, | |
| * or avcodec_free_context() (whichever comes first). | |
| */ | |
| void *hwaccel_context; | |
| /** | |
| * error | |
| * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR. | |
| * - decoding: unused | |
| */ | |
| uint64_t error[AV_NUM_DATA_POINTERS]; | |
| /** | |
| * DCT algorithm, see FF_DCT_* below | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int dct_algo; | |
| /** | |
| * IDCT algorithm, see FF_IDCT_* below. | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| */ | |
| int idct_algo; | |
| // formerly used by xvmc | |
| /** | |
| * bits per sample/pixel from the demuxer (needed for huffyuv). | |
| * - encoding: Set by libavcodec. | |
| * - decoding: Set by user. | |
| */ | |
| int bits_per_coded_sample; | |
| /** | |
| * Bits per sample/pixel of internal libavcodec pixel/sample format. | |
| * - encoding: set by user. | |
| * - decoding: set by libavcodec. | |
| */ | |
| int bits_per_raw_sample; | |
| /** | |
| * low resolution decoding, 1-> 1/2 size, 2->1/4 size | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| */ | |
| int lowres; | |
| /** | |
| * thread count | |
| * is used to decide how many independent tasks should be passed to execute() | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| */ | |
| int thread_count; | |
| /** | |
| * Which multithreading methods to use. | |
| * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread, | |
| * so clients which cannot provide future frames should not use it. | |
| * | |
| * - encoding: Set by user, otherwise the default is used. | |
| * - decoding: Set by user, otherwise the default is used. | |
| */ | |
| int thread_type; | |
| /** | |
| * Which multithreading methods are in use by the codec. | |
| * - encoding: Set by libavcodec. | |
| * - decoding: Set by libavcodec. | |
| */ | |
| int active_thread_type; | |
| /** | |
| * The codec may call this to execute several independent things. | |
| * It will return only after finishing all tasks. | |
| * The user may replace this with some multithreaded implementation, | |
| * the default implementation will execute the parts serially. | |
| * @param count the number of things to execute | |
| * - encoding: Set by libavcodec, user can override. | |
| * - decoding: Set by libavcodec, user can override. | |
| */ | |
| int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size); | |
| /** | |
| * The codec may call this to execute several independent things. | |
| * It will return only after finishing all tasks. | |
| * The user may replace this with some multithreaded implementation, | |
| * the default implementation will execute the parts serially. | |
| * @param c context passed also to func | |
| * @param count the number of things to execute | |
| * @param arg2 argument passed unchanged to func | |
| * @param ret return values of executed functions, must have space for "count" values. May be NULL. | |
| * @param func function that will be called count times, with jobnr from 0 to count-1. | |
| * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no | |
| * two instances of func executing at the same time will have the same threadnr. | |
| * @return always 0 currently, but code should handle a future improvement where when any call to func | |
| * returns < 0 no further calls to func may be done and < 0 is returned. | |
| * - encoding: Set by libavcodec, user can override. | |
| * - decoding: Set by libavcodec, user can override. | |
| */ | |
| int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count); | |
| /** | |
| * noise vs. sse weight for the nsse comparison function | |
| * - encoding: Set by user. | |
| * - decoding: unused | |
| */ | |
| int nsse_weight; | |
| /** | |
| * profile | |
| * - encoding: Set by user. | |
| * - decoding: Set by libavcodec. | |
| * See the AV_PROFILE_* defines in defs.h. | |
| */ | |
| int profile; | |
| /** @deprecated The following defines are deprecated; use AV_PROFILE_* | |
| * in defs.h instead. */ | |
| /** | |
| * level | |
| * - encoding: Set by user. | |
| * - decoding: Set by libavcodec. | |
| * See AV_LEVEL_* in defs.h. | |
| */ | |
| int level; | |
| /** @deprecated The following define is deprecated; use AV_LEVEL_UNKOWN | |
| * in defs.h instead. */ | |
| /** | |
| * Skip loop filtering for selected frames. | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| */ | |
| enum AVDiscard skip_loop_filter; | |
| /** | |
| * Skip IDCT/dequantization for selected frames. | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| */ | |
| enum AVDiscard skip_idct; | |
| /** | |
| * Skip decoding for selected frames. | |
| * - encoding: unused | |
| * - decoding: Set by user. | |
| */ | |
| enum AVDiscard skip_frame; | |
| /** | |
| * Header containing style information for text subtitles. | |
| * For SUBTITLE_ASS subtitle type, it should contain the whole ASS | |
| * [Script Info] and [V4+ Styles] section, plus the [Events] line and | |
| * the Format line following. It shouldn't include any Dialogue line. | |
| * - encoding: Set/allocated/freed by user (before avcodec_open2()) | |
| * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2()) | |
| */ | |
| uint8_t *subtitle_header; | |
| int subtitle_header_size; | |
| /** | |
| * Audio only. The number of "priming" samples (padding) inserted by the | |
| * encoder at the beginning of the audio. I.e. this number of leading | |
| * decoded samples must be discarded by the caller to get the original audio | |
| * without leading padding. | |
| * | |
| * - decoding: unused | |
| * - encoding: Set by libavcodec. The timestamps on the output packets are | |
| * adjusted by the encoder so that they always refer to the | |
| * first sample of the data actually contained in the packet, | |
| * including any added padding. E.g. if the timebase is | |
| * 1/samplerate and the timestamp of the first input sample is | |
| * 0, the timestamp of the first output packet will be | |
| * -initial_padding. | |
| */ | |
| int initial_padding; | |
| /** | |
| * - decoding: For codecs that store a framerate value in the compressed | |
| * bitstream, the decoder may export it here. { 0, 1} when | |
| * unknown. | |
| * - encoding: May be used to signal the framerate of CFR content to an | |
| * encoder. | |
| */ | |
| AVRational framerate; | |
| /** | |
| * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx. | |
| * - encoding: unused. | |
| * - decoding: Set by libavcodec before calling get_format() | |
| */ | |
| enum AVPixelFormat sw_pix_fmt; | |
| /** | |
| * Timebase in which pkt_dts/pts and AVPacket.dts/pts are expressed. | |
| * - encoding: unused. | |
| * - decoding: set by user. | |
| */ | |
| AVRational pkt_timebase; | |
| /** | |
| * AVCodecDescriptor | |
| * - encoding: unused. | |
| * - decoding: set by libavcodec. | |
| */ | |
| const AVCodecDescriptor *codec_descriptor; | |
| /** | |
| * Current statistics for PTS correction. | |
| * - decoding: maintained and used by libavcodec, not intended to be used by user apps | |
| * - encoding: unused | |
| */ | |
| int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far | |
| int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far | |
| int64_t pts_correction_last_pts; /// PTS of the last frame | |
| int64_t pts_correction_last_dts; /// DTS of the last frame | |
| /** | |
| * Character encoding of the input subtitles file. | |
| * - decoding: set by user | |
| * - encoding: unused | |
| */ | |
| char *sub_charenc; | |
| /** | |
| * Subtitles character encoding mode. Formats or codecs might be adjusting | |
| * this setting (if they are doing the conversion themselves for instance). | |
| * - decoding: set by libavcodec | |
| * - encoding: unused | |
| */ | |
| int sub_charenc_mode; | |
| /** | |
| * Skip processing alpha if supported by codec. | |
| * Note that if the format uses pre-multiplied alpha (common with VP6, | |
| * and recommended due to better video quality/compression) | |
| * the image will look as if alpha-blended onto a black background. | |
| * However for formats that do not use pre-multiplied alpha | |
| * there might be serious artefacts (though e.g. libswscale currently | |
| * assumes pre-multiplied alpha anyway). | |
| * | |
| * - decoding: set by user | |
| * - encoding: unused | |
| */ | |
| int skip_alpha; | |
| /** | |
| * Number of samples to skip after a discontinuity | |
| * - decoding: unused | |
| * - encoding: set by libavcodec | |
| */ | |
| int seek_preroll; | |
| /** | |
| * custom intra quantization matrix | |
| * - encoding: Set by user, can be NULL. | |
| * - decoding: unused. | |
| */ | |
| uint16_t *chroma_intra_matrix; | |
| /** | |
| * dump format separator. | |
| * can be ", " or "\n " or anything else | |
| * - encoding: Set by user. | |
| * - decoding: Set by user. | |
| */ | |
| uint8_t *dump_separator; | |
| /** | |
| * ',' separated list of allowed decoders. | |
| * If NULL then all are allowed | |
| * - encoding: unused | |
| * - decoding: set by user | |
| */ | |
| char *codec_whitelist; | |
| /** | |
| * Properties of the stream that gets decoded | |
| * - encoding: unused | |
| * - decoding: set by libavcodec | |
| */ | |
| unsigned properties; | |
| /** | |
| * Additional data associated with the entire coded stream. | |
| * | |
| * - decoding: unused | |
| * - encoding: may be set by libavcodec after avcodec_open2(). | |
| */ | |
| AVPacketSideData *coded_side_data; | |
| int nb_coded_side_data; | |
| /** | |
| * A reference to the AVHWFramesContext describing the input (for encoding) | |
| * or output (decoding) frames. The reference is set by the caller and | |
| * afterwards owned (and freed) by libavcodec - it should never be read by | |
| * the caller after being set. | |
| * | |
| * - decoding: This field should be set by the caller from the get_format() | |
| * callback. The previous reference (if any) will always be | |
| * unreffed by libavcodec before the get_format() call. | |
| * | |
| * If the default get_buffer2() is used with a hwaccel pixel | |
| * format, then this AVHWFramesContext will be used for | |
| * allocating the frame buffers. | |
| * | |
| * - encoding: For hardware encoders configured to use a hwaccel pixel | |
| * format, this field should be set by the caller to a reference | |
| * to the AVHWFramesContext describing input frames. | |
| * AVHWFramesContext.format must be equal to | |
| * AVCodecContext.pix_fmt. | |
| * | |
| * This field should be set before avcodec_open2() is called. | |
| */ | |
| AVBufferRef *hw_frames_ctx; | |
| /** | |
| * Audio only. The amount of padding (in samples) appended by the encoder to | |
| * the end of the audio. I.e. this number of decoded samples must be | |
| * discarded by the caller from the end of the stream to get the original | |
| * audio without any trailing padding. | |
| * | |
| * - decoding: unused | |
| * - encoding: unused | |
| */ | |
| int trailing_padding; | |
| /** | |
| * The number of pixels per image to maximally accept. | |
| * | |
| * - decoding: set by user | |
| * - encoding: set by user | |
| */ | |
| int64_t max_pixels; | |
| /** | |
| * A reference to the AVHWDeviceContext describing the device which will | |
| * be used by a hardware encoder/decoder. The reference is set by the | |
| * caller and afterwards owned (and freed) by libavcodec. | |
| * | |
| * This should be used if either the codec device does not require | |
| * hardware frames or any that are used are to be allocated internally by | |
| * libavcodec. If the user wishes to supply any of the frames used as | |
| * encoder input or decoder output then hw_frames_ctx should be used | |
| * instead. When hw_frames_ctx is set in get_format() for a decoder, this | |
| * field will be ignored while decoding the associated stream segment, but | |
| * may again be used on a following one after another get_format() call. | |
| * | |
| * For both encoders and decoders this field should be set before | |
| * avcodec_open2() is called and must not be written to thereafter. | |
| * | |
| * Note that some decoders may require this field to be set initially in | |
| * order to support hw_frames_ctx at all - in that case, all frames | |
| * contexts used must be created on the same device. | |
| */ | |
| AVBufferRef *hw_device_ctx; | |
| /** | |
| * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated | |
| * decoding (if active). | |
| * - encoding: unused | |
| * - decoding: Set by user (either before avcodec_open2(), or in the | |
| * AVCodecContext.get_format callback) | |
| */ | |
| int hwaccel_flags; | |
| /** | |
| * Video decoding only. Certain video codecs support cropping, meaning that | |
| * only a sub-rectangle of the decoded frame is intended for display. This | |
| * option controls how cropping is handled by libavcodec. | |
| * | |
| * When set to 1 (the default), libavcodec will apply cropping internally. | |
| * I.e. it will modify the output frame width/height fields and offset the | |
| * data pointers (only by as much as possible while preserving alignment, or | |
| * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that | |
| * the frames output by the decoder refer only to the cropped area. The | |
| * crop_* fields of the output frames will be zero. | |
| * | |
| * When set to 0, the width/height fields of the output frames will be set | |
| * to the coded dimensions and the crop_* fields will describe the cropping | |
| * rectangle. Applying the cropping is left to the caller. | |
| * | |
| * @warning When hardware acceleration with opaque output frames is used, | |
| * libavcodec is unable to apply cropping from the top/left border. | |
| * | |
| * @note when this option is set to zero, the width/height fields of the | |
| * AVCodecContext and output AVFrames have different meanings. The codec | |
| * context fields store display dimensions (with the coded dimensions in | |
| * coded_width/height), while the frame fields store the coded dimensions | |
| * (with the display dimensions being determined by the crop_* fields). | |
| */ | |
| int apply_cropping; | |
| /* | |
| * Video decoding only. Sets the number of extra hardware frames which | |
| * the decoder will allocate for use by the caller. This must be set | |
| * before avcodec_open2() is called. | |
| * | |
| * Some hardware decoders require all frames that they will use for | |
| * output to be defined in advance before decoding starts. For such | |
| * decoders, the hardware frame pool must therefore be of a fixed size. | |
| * The extra frames set here are on top of any number that the decoder | |
| * needs internally in order to operate normally (for example, frames | |
| * used as reference pictures). | |
| */ | |
| int extra_hw_frames; | |
| /** | |
| * The percentage of damaged samples to discard a frame. | |
| * | |
| * - decoding: set by user | |
| * - encoding: unused | |
| */ | |
| int discard_damaged_percentage; | |
| /** | |
| * The number of samples per frame to maximally accept. | |
| * | |
| * - decoding: set by user | |
| * - encoding: set by user | |
| */ | |
| int64_t max_samples; | |
| /** | |
| * Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of | |
| * metadata exported in frame, packet, or coded stream side data by | |
| * decoders and encoders. | |
| * | |
| * - decoding: set by user | |
| * - encoding: set by user | |
| */ | |
| int export_side_data; | |
| /** | |
| * This callback is called at the beginning of each packet to get a data | |
| * buffer for it. | |
| * | |
| * The following field will be set in the packet before this callback is | |
| * called: | |
| * - size | |
| * This callback must use the above value to calculate the required buffer size, | |
| * which must padded by at least AV_INPUT_BUFFER_PADDING_SIZE bytes. | |
| * | |
| * In some specific cases, the encoder may not use the entire buffer allocated by this | |
| * callback. This will be reflected in the size value in the packet once returned by | |
| * avcodec_receive_packet(). | |
| * | |
| * This callback must fill the following fields in the packet: | |
| * - data: alignment requirements for AVPacket apply, if any. Some architectures and | |
| * encoders may benefit from having aligned data. | |
| * - buf: must contain a pointer to an AVBufferRef structure. The packet's | |
| * data pointer must be contained in it. See: av_buffer_create(), av_buffer_alloc(), | |
| * and av_buffer_ref(). | |
| * | |
| * If AV_CODEC_CAP_DR1 is not set then get_encode_buffer() must call | |
| * avcodec_default_get_encode_buffer() instead of providing a buffer allocated by | |
| * some other means. | |
| * | |
| * The flags field may contain a combination of AV_GET_ENCODE_BUFFER_FLAG_ flags. | |
| * They may be used for example to hint what use the buffer may get after being | |
| * created. | |
| * Implementations of this callback may ignore flags they don't understand. | |
| * If AV_GET_ENCODE_BUFFER_FLAG_REF is set in flags then the packet may be reused | |
| * (read and/or written to if it is writable) later by libavcodec. | |
| * | |
| * This callback must be thread-safe, as when frame threading is used, it may | |
| * be called from multiple threads simultaneously. | |
| * | |
| * @see avcodec_default_get_encode_buffer() | |
| * | |
| * - encoding: Set by libavcodec, user can override. | |
| * - decoding: unused | |
| */ | |
| int (*get_encode_buffer)(struct AVCodecContext *s, AVPacket *pkt, int flags); | |
| /** | |
| * Audio channel layout. | |
| * - encoding: must be set by the caller, to one of AVCodec.ch_layouts. | |
| * - decoding: may be set by the caller if known e.g. from the container. | |
| * The decoder can then override during decoding as needed. | |
| */ | |
| AVChannelLayout ch_layout; | |
| /** | |
| * Frame counter, set by libavcodec. | |
| * | |
| * - decoding: total number of frames returned from the decoder so far. | |
| * - encoding: total number of frames passed to the encoder so far. | |
| * | |
| * @note the counter is not incremented if encoding/decoding resulted in | |
| * an error. | |
| */ | |
| int64_t frame_num; | |
| } AVCodecContext; | |
| /** | |
| * @defgroup lavc_hwaccel AVHWAccel | |
| * | |
| * @note Nothing in this structure should be accessed by the user. At some | |
| * point in future it will not be externally visible at all. | |
| * | |
| * @{ | |
| */ | |
| typedef struct AVHWAccel { | |
| /** | |
| * Name of the hardware accelerated codec. | |
| * The name is globally unique among encoders and among decoders (but an | |
| * encoder and a decoder can share the same name). | |
| */ | |
| const char *name; | |
| /** | |
| * Type of codec implemented by the hardware accelerator. | |
| * | |
| * See AVMEDIA_TYPE_xxx | |
| */ | |
| enum AVMediaType type; | |
| /** | |
| * Codec implemented by the hardware accelerator. | |
| * | |
| * See AV_CODEC_ID_xxx | |
| */ | |
| enum AVCodecID id; | |
| /** | |
| * Supported pixel format. | |
| * | |
| * Only hardware accelerated formats are supported here. | |
| */ | |
| enum AVPixelFormat pix_fmt; | |
| /** | |
| * Hardware accelerated codec capabilities. | |
| * see AV_HWACCEL_CODEC_CAP_* | |
| */ | |
| int capabilities; | |
| } AVHWAccel; | |
| /** | |
| * HWAccel is experimental and is thus avoided in favor of non experimental | |
| * codecs | |
| */ | |
| /** | |
| * Hardware acceleration should be used for decoding even if the codec level | |
| * used is unknown or higher than the maximum supported level reported by the | |
| * hardware driver. | |
| * | |
| * It's generally a good idea to pass this flag unless you have a specific | |
| * reason not to, as hardware tends to under-report supported levels. | |
| */ | |
| /** | |
| * Hardware acceleration can output YUV pixel formats with a different chroma | |
| * sampling than 4:2:0 and/or other than 8 bits per component. | |
| */ | |
| /** | |
| * Hardware acceleration should still be attempted for decoding when the | |
| * codec profile does not match the reported capabilities of the hardware. | |
| * | |
| * For example, this can be used to try to decode baseline profile H.264 | |
| * streams in hardware - it will often succeed, because many streams marked | |
| * as baseline profile actually conform to constrained baseline profile. | |
| * | |
| * @warning If the stream is actually not supported then the behaviour is | |
| * undefined, and may include returning entirely incorrect output | |
| * while indicating success. | |
| */ | |
| /** | |
| * Some hardware decoders (namely nvdec) can either output direct decoder | |
| * surfaces, or make an on-device copy and return said copy. | |
| * There is a hard limit on how many decoder surfaces there can be, and it | |
| * cannot be accurately guessed ahead of time. | |
| * For some processing chains, this can be okay, but others will run into the | |
| * limit and in turn produce very confusing errors that require fine tuning of | |
| * more or less obscure options by the user, or in extreme cases cannot be | |
| * resolved at all without inserting an avfilter that forces a copy. | |
| * | |
| * Thus, the hwaccel will by default make a copy for safety and resilience. | |
| * If a users really wants to minimize the amount of copies, they can set this | |
| * flag and ensure their processing chain does not exhaust the surface pool. | |
| */ | |
| /** | |
| * @} | |
| */ | |
| enum AVSubtitleType { | |
| SUBTITLE_NONE, | |
| SUBTITLE_BITMAP, ///< A bitmap, pict will be set | |
| /** | |
| * Plain text, the text field must be set by the decoder and is | |
| * authoritative. ass and pict fields may contain approximations. | |
| */ | |
| SUBTITLE_TEXT, | |
| /** | |
| * Formatted text, the ass field must be set by the decoder and is | |
| * authoritative. pict and text fields may contain approximations. | |
| */ | |
| SUBTITLE_ASS, | |
| }; | |
| typedef struct AVSubtitleRect { | |
| int x; ///< top left corner of pict, undefined when pict is not set | |
| int y; ///< top left corner of pict, undefined when pict is not set | |
| int w; ///< width of pict, undefined when pict is not set | |
| int h; ///< height of pict, undefined when pict is not set | |
| int nb_colors; ///< number of colors in pict, undefined when pict is not set | |
| /** | |
| * data+linesize for the bitmap of this subtitle. | |
| * Can be set for text/ass as well once they are rendered. | |
| */ | |
| uint8_t *data[4]; | |
| int linesize[4]; | |
| enum AVSubtitleType type; | |
| char *text; ///< 0 terminated plain UTF-8 text | |
| /** | |
| * 0 terminated ASS/SSA compatible event line. | |
| * The presentation of this is unaffected by the other values in this | |
| * struct. | |
| */ | |
| char *ass; | |
| int flags; | |
| } AVSubtitleRect; | |
| typedef struct AVSubtitle { | |
| uint16_t format; /* 0 = graphics */ | |
| uint32_t start_display_time; /* relative to packet pts, in ms */ | |
| uint32_t end_display_time; /* relative to packet pts, in ms */ | |
| unsigned num_rects; | |
| AVSubtitleRect **rects; | |
| int64_t pts; ///< Same as packet pts, in AV_TIME_BASE | |
| } AVSubtitle; | |
| /** | |
| * Return the LIBAVCODEC_VERSION_INT constant. | |
| */ | |
| unsigned avcodec_version(void); | |
| /** | |
| * Return the libavcodec build-time configuration. | |
| */ | |
| const char *avcodec_configuration(void); | |
| /** | |
| * Return the libavcodec license. | |
| */ | |
| const char *avcodec_license(void); | |
| /** | |
| * Allocate an AVCodecContext and set its fields to default values. The | |
| * resulting struct should be freed with avcodec_free_context(). | |
| * | |
| * @param codec if non-NULL, allocate private data and initialize defaults | |
| * for the given codec. It is illegal to then call avcodec_open2() | |
| * with a different codec. | |
| * If NULL, then the codec-specific defaults won't be initialized, | |
| * which may result in suboptimal default settings (this is | |
| * important mainly for encoders, e.g. libx264). | |
| * | |
| * @return An AVCodecContext filled with default values or NULL on failure. | |
| */ | |
| AVCodecContext *avcodec_alloc_context3(const AVCodec *codec); | |
| /** | |
| * Free the codec context and everything associated with it and write NULL to | |
| * the provided pointer. | |
| */ | |
| void avcodec_free_context(AVCodecContext **avctx); | |
| /** | |
| * Get the AVClass for AVCodecContext. It can be used in combination with | |
| * AV_OPT_SEARCH_FAKE_OBJ for examining options. | |
| * | |
| * @see av_opt_find(). | |
| */ | |
| const AVClass *avcodec_get_class(void); | |
| /** | |
| * Get the AVClass for AVSubtitleRect. It can be used in combination with | |
| * AV_OPT_SEARCH_FAKE_OBJ for examining options. | |
| * | |
| * @see av_opt_find(). | |
| */ | |
| const AVClass *avcodec_get_subtitle_rect_class(void); | |
| /** | |
| * Fill the parameters struct based on the values from the supplied codec | |
| * context. Any allocated fields in par are freed and replaced with duplicates | |
| * of the corresponding fields in codec. | |
| * | |
| * @return >= 0 on success, a negative AVERROR code on failure | |
| */ | |
| int avcodec_parameters_from_context(AVCodecParameters *par, | |
| const AVCodecContext *codec); | |
| /** | |
| * Fill the codec context based on the values from the supplied codec | |
| * parameters. Any allocated fields in codec that have a corresponding field in | |
| * par are freed and replaced with duplicates of the corresponding field in par. | |
| * Fields in codec that do not have a counterpart in par are not touched. | |
| * | |
| * @return >= 0 on success, a negative AVERROR code on failure. | |
| */ | |
| int avcodec_parameters_to_context(AVCodecContext *codec, | |
| const AVCodecParameters *par); | |
| /** | |
| * Initialize the AVCodecContext to use the given AVCodec. Prior to using this | |
| * function the context has to be allocated with avcodec_alloc_context3(). | |
| * | |
| * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), | |
| * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for | |
| * retrieving a codec. | |
| * | |
| * Depending on the codec, you might need to set options in the codec context | |
| * also for decoding (e.g. width, height, or the pixel or audio sample format in | |
| * the case the information is not available in the bitstream, as when decoding | |
| * raw audio or video). | |
| * | |
| * Options in the codec context can be set either by setting them in the options | |
| * AVDictionary, or by setting the values in the context itself, directly or by | |
| * using the av_opt_set() API before calling this function. | |
| * | |
| * Example: | |
| * @code | |
| * av_dict_set(&opts, "b", "2.5M", 0); | |
| * codec = avcodec_find_decoder(AV_CODEC_ID_H264); | |
| * if (!codec) | |
| * exit(1); | |
| * | |
| * context = avcodec_alloc_context3(codec); | |
| * | |
| * if (avcodec_open2(context, codec, opts) < 0) | |
| * exit(1); | |
| * @endcode | |
| * | |
| * In the case AVCodecParameters are available (e.g. when demuxing a stream | |
| * using libavformat, and accessing the AVStream contained in the demuxer), the | |
| * codec parameters can be copied to the codec context using | |
| * avcodec_parameters_to_context(), as in the following example: | |
| * | |
| * @code | |
| * AVStream *stream = ...; | |
| * context = avcodec_alloc_context3(codec); | |
| * if (avcodec_parameters_to_context(context, stream->codecpar) < 0) | |
| * exit(1); | |
| * if (avcodec_open2(context, codec, NULL) < 0) | |
| * exit(1); | |
| * @endcode | |
| * | |
| * @note Always call this function before using decoding routines (such as | |
| * @ref avcodec_receive_frame()). | |
| * | |
| * @param avctx The context to initialize. | |
| * @param codec The codec to open this context for. If a non-NULL codec has been | |
| * previously passed to avcodec_alloc_context3() or | |
| * for this context, then this parameter MUST be either NULL or | |
| * equal to the previously passed codec. | |
| * @param options A dictionary filled with AVCodecContext and codec-private | |
| * options, which are set on top of the options already set in | |
| * avctx, can be NULL. On return this object will be filled with | |
| * options that were not found in the avctx codec context. | |
| * | |
| * @return zero on success, a negative value on error | |
| * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(), | |
| * av_dict_set(), av_opt_set(), av_opt_find(), avcodec_parameters_to_context() | |
| */ | |
| int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options); | |
| /** | |
| * Close a given AVCodecContext and free all the data associated with it | |
| * (but not the AVCodecContext itself). | |
| * | |
| * Calling this function on an AVCodecContext that hasn't been opened will free | |
| * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL | |
| * codec. Subsequent calls will do nothing. | |
| * | |
| * @note Do not use this function. Use avcodec_free_context() to destroy a | |
| * codec context (either open or closed). Opening and closing a codec context | |
| * multiple times is not supported anymore -- use multiple codec contexts | |
| * instead. | |
| */ | |
| int avcodec_close(AVCodecContext *avctx); | |
| /** | |
| * Free all allocated data in the given subtitle struct. | |
| * | |
| * @param sub AVSubtitle to free. | |
| */ | |
| void avsubtitle_free(AVSubtitle *sub); | |
| /** | |
| * @} | |
| */ | |
| /** | |
| * @addtogroup lavc_decoding | |
| * @{ | |
| */ | |
| /** | |
| * The default callback for AVCodecContext.get_buffer2(). It is made public so | |
| * it can be called by custom get_buffer2() implementations for decoders without | |
| * AV_CODEC_CAP_DR1 set. | |
| */ | |
| int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags); | |
| /** | |
| * The default callback for AVCodecContext.get_encode_buffer(). It is made public so | |
| * it can be called by custom get_encode_buffer() implementations for encoders without | |
| * AV_CODEC_CAP_DR1 set. | |
| */ | |
| int avcodec_default_get_encode_buffer(AVCodecContext *s, AVPacket *pkt, int flags); | |
| /** | |
| * Modify width and height values so that they will result in a memory | |
| * buffer that is acceptable for the codec if you do not use any horizontal | |
| * padding. | |
| * | |
| * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened. | |
| */ | |
| void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height); | |
| /** | |
| * Modify width and height values so that they will result in a memory | |
| * buffer that is acceptable for the codec if you also ensure that all | |
| * line sizes are a multiple of the respective linesize_align[i]. | |
| * | |
| * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened. | |
| */ | |
| void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, | |
| int linesize_align[AV_NUM_DATA_POINTERS]); | |
| /** | |
| * Converts AVChromaLocation to swscale x/y chroma position. | |
| * | |
| * The positions represent the chroma (0,0) position in a coordinates system | |
| * with luma (0,0) representing the origin and luma(1,1) representing 256,256 | |
| * | |
| * @param xpos horizontal chroma sample position | |
| * @param ypos vertical chroma sample position | |
| * @deprecated Use av_chroma_location_enum_to_pos() instead. | |
| */ | |
| attribute_deprecated | |
| int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos); | |
| /** | |
| * Converts swscale x/y chroma position to AVChromaLocation. | |
| * | |
| * The positions represent the chroma (0,0) position in a coordinates system | |
| * with luma (0,0) representing the origin and luma(1,1) representing 256,256 | |
| * | |
| * @param xpos horizontal chroma sample position | |
| * @param ypos vertical chroma sample position | |
| * @deprecated Use av_chroma_location_pos_to_enum() instead. | |
| */ | |
| attribute_deprecated | |
| enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos); | |
| /** | |
| * Decode a subtitle message. | |
| * Return a negative value on error, otherwise return the number of bytes used. | |
| * If no subtitle could be decompressed, got_sub_ptr is zero. | |
| * Otherwise, the subtitle is stored in *sub. | |
| * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for | |
| * simplicity, because the performance difference is expected to be negligible | |
| * and reusing a get_buffer written for video codecs would probably perform badly | |
| * due to a potentially very different allocation pattern. | |
| * | |
| * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input | |
| * and output. This means that for some packets they will not immediately | |
| * produce decoded output and need to be flushed at the end of decoding to get | |
| * all the decoded data. Flushing is done by calling this function with packets | |
| * with avpkt->data set to NULL and avpkt->size set to 0 until it stops | |
| * returning subtitles. It is safe to flush even those decoders that are not | |
| * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned. | |
| * | |
| * @note The AVCodecContext MUST have been opened with @ref avcodec_open2() | |
| * before packets may be fed to the decoder. | |
| * | |
| * @param avctx the codec context | |
| * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored, | |
| * must be freed with avsubtitle_free if *got_sub_ptr is set. | |
| * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero. | |
| * @param[in] avpkt The input AVPacket containing the input buffer. | |
| */ | |
| int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, | |
| int *got_sub_ptr, const AVPacket *avpkt); | |
| /** | |
| * Supply raw packet data as input to a decoder. | |
| * | |
| * Internally, this call will copy relevant AVCodecContext fields, which can | |
| * influence decoding per-packet, and apply them when the packet is actually | |
| * decoded. (For example AVCodecContext.skip_frame, which might direct the | |
| * decoder to drop the frame contained by the packet sent with this function.) | |
| * | |
| * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE | |
| * larger than the actual read bytes because some optimized bitstream | |
| * readers read 32 or 64 bits at once and could read over the end. | |
| * | |
| * @note The AVCodecContext MUST have been opened with @ref avcodec_open2() | |
| * before packets may be fed to the decoder. | |
| * | |
| * @param avctx codec context | |
| * @param[in] avpkt The input AVPacket. Usually, this will be a single video | |
| * frame, or several complete audio frames. | |
| * Ownership of the packet remains with the caller, and the | |
| * decoder will not write to the packet. The decoder may create | |
| * a reference to the packet data (or copy it if the packet is | |
| * not reference-counted). | |
| * Unlike with older APIs, the packet is always fully consumed, | |
| * and if it contains multiple frames (e.g. some audio codecs), | |
| * will require you to call avcodec_receive_frame() multiple | |
| * times afterwards before you can send a new packet. | |
| * It can be NULL (or an AVPacket with data set to NULL and | |
| * size set to 0); in this case, it is considered a flush | |
| * packet, which signals the end of the stream. Sending the | |
| * first flush packet will return success. Subsequent ones are | |
| * unnecessary and will return AVERROR_EOF. If the decoder | |
| * still has frames buffered, it will return them after sending | |
| * a flush packet. | |
| * | |
| * @retval 0 success | |
| * @retval AVERROR(EAGAIN) input is not accepted in the current state - user | |
| * must read output with avcodec_receive_frame() (once | |
| * all output is read, the packet should be resent, | |
| * and the call will not fail with EAGAIN). | |
| * @retval AVERROR_EOF the decoder has been flushed, and no new packets can be | |
| * sent to it (also returned if more than 1 flush | |
| * packet is sent) | |
| * @retval AVERROR(EINVAL) codec not opened, it is an encoder, or requires flush | |
| * @retval AVERROR(ENOMEM) failed to add packet to internal queue, or similar | |
| * @retval "another negative error code" legitimate decoding errors | |
| */ | |
| int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt); | |
| /** | |
| * Return decoded output data from a decoder or encoder (when the | |
| * @ref AV_CODEC_FLAG_RECON_FRAME flag is used). | |
| * | |
| * @param avctx codec context | |
| * @param frame This will be set to a reference-counted video or audio | |
| * frame (depending on the decoder type) allocated by the | |
| * codec. Note that the function will always call | |
| * av_frame_unref(frame) before doing anything else. | |
| * | |
| * @retval 0 success, a frame was returned | |
| * @retval AVERROR(EAGAIN) output is not available in this state - user must | |
| * try to send new input | |
| * @retval AVERROR_EOF the codec has been fully flushed, and there will be | |
| * no more output frames | |
| * @retval AVERROR(EINVAL) codec not opened, or it is an encoder without the | |
| * @ref AV_CODEC_FLAG_RECON_FRAME flag enabled | |
| * @retval "other negative error code" legitimate decoding errors | |
| */ | |
| int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame); | |
| /** | |
| * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet() | |
| * to retrieve buffered output packets. | |
| * | |
| * @param avctx codec context | |
| * @param[in] frame AVFrame containing the raw audio or video frame to be encoded. | |
| * Ownership of the frame remains with the caller, and the | |
| * encoder will not write to the frame. The encoder may create | |
| * a reference to the frame data (or copy it if the frame is | |
| * not reference-counted). | |
| * It can be NULL, in which case it is considered a flush | |
| * packet. This signals the end of the stream. If the encoder | |
| * still has packets buffered, it will return them after this | |
| * call. Once flushing mode has been entered, additional flush | |
| * packets are ignored, and sending frames will return | |
| * AVERROR_EOF. | |
| * | |
| * For audio: | |
| * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame | |
| * can have any number of samples. | |
| * If it is not set, frame->nb_samples must be equal to | |
| * avctx->frame_size for all frames except the last. | |
| * The final frame may be smaller than avctx->frame_size. | |
| * @retval 0 success | |
| * @retval AVERROR(EAGAIN) input is not accepted in the current state - user must | |
| * read output with avcodec_receive_packet() (once all | |
| * output is read, the packet should be resent, and the | |
| * call will not fail with EAGAIN). | |
| * @retval AVERROR_EOF the encoder has been flushed, and no new frames can | |
| * be sent to it | |
| * @retval AVERROR(EINVAL) codec not opened, it is a decoder, or requires flush | |
| * @retval AVERROR(ENOMEM) failed to add packet to internal queue, or similar | |
| * @retval "another negative error code" legitimate encoding errors | |
| */ | |
| int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame); | |
| /** | |
| * Read encoded data from the encoder. | |
| * | |
| * @param avctx codec context | |
| * @param avpkt This will be set to a reference-counted packet allocated by the | |
| * encoder. Note that the function will always call | |
| * av_packet_unref(avpkt) before doing anything else. | |
| * @retval 0 success | |
| * @retval AVERROR(EAGAIN) output is not available in the current state - user must | |
| * try to send input | |
| * @retval AVERROR_EOF the encoder has been fully flushed, and there will be no | |
| * more output packets | |
| * @retval AVERROR(EINVAL) codec not opened, or it is a decoder | |
| * @retval "another negative error code" legitimate encoding errors | |
| */ | |
| int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt); | |
| /** | |
| * Create and return a AVHWFramesContext with values adequate for hardware | |
| * decoding. This is meant to get called from the get_format callback, and is | |
| * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx. | |
| * This API is for decoding with certain hardware acceleration modes/APIs only. | |
| * | |
| * The returned AVHWFramesContext is not initialized. The caller must do this | |
| * with av_hwframe_ctx_init(). | |
| * | |
| * Calling this function is not a requirement, but makes it simpler to avoid | |
| * codec or hardware API specific details when manually allocating frames. | |
| * | |
| * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx, | |
| * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes | |
| * it unnecessary to call this function or having to care about | |
| * AVHWFramesContext initialization at all. | |
| * | |
| * There are a number of requirements for calling this function: | |
| * | |
| * - It must be called from get_format with the same avctx parameter that was | |
| * passed to get_format. Calling it outside of get_format is not allowed, and | |
| * can trigger undefined behavior. | |
| * - The function is not always supported (see description of return values). | |
| * Even if this function returns successfully, hwaccel initialization could | |
| * fail later. (The degree to which implementations check whether the stream | |
| * is actually supported varies. Some do this check only after the user's | |
| * get_format callback returns.) | |
| * - The hw_pix_fmt must be one of the choices suggested by get_format. If the | |
| * user decides to use a AVHWFramesContext prepared with this API function, | |
| * the user must return the same hw_pix_fmt from get_format. | |
| * - The device_ref passed to this function must support the given hw_pix_fmt. | |
| * - After calling this API function, it is the user's responsibility to | |
| * initialize the AVHWFramesContext (returned by the out_frames_ref parameter), | |
| * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done | |
| * before returning from get_format (this is implied by the normal | |
| * AVCodecContext.hw_frames_ctx API rules). | |
| * - The AVHWFramesContext parameters may change every time time get_format is | |
| * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So | |
| * you are inherently required to go through this process again on every | |
| * get_format call. | |
| * - It is perfectly possible to call this function without actually using | |
| * the resulting AVHWFramesContext. One use-case might be trying to reuse a | |
| * previously initialized AVHWFramesContext, and calling this API function | |
| * only to test whether the required frame parameters have changed. | |
| * - Fields that use dynamically allocated values of any kind must not be set | |
| * by the user unless setting them is explicitly allowed by the documentation. | |
| * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque, | |
| * the new free callback must call the potentially set previous free callback. | |
| * This API call may set any dynamically allocated fields, including the free | |
| * callback. | |
| * | |
| * The function will set at least the following fields on AVHWFramesContext | |
| * (potentially more, depending on hwaccel API): | |
| * | |
| * - All fields set by av_hwframe_ctx_alloc(). | |
| * - Set the format field to hw_pix_fmt. | |
| * - Set the sw_format field to the most suited and most versatile format. (An | |
| * implication is that this will prefer generic formats over opaque formats | |
| * with arbitrary restrictions, if possible.) | |
| * - Set the width/height fields to the coded frame size, rounded up to the | |
| * API-specific minimum alignment. | |
| * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size | |
| * field to the number of maximum reference surfaces possible with the codec, | |
| * plus 1 surface for the user to work (meaning the user can safely reference | |
| * at most 1 decoded surface at a time), plus additional buffering introduced | |
| * by frame threading. If the hwaccel does not require pre-allocation, the | |
| * field is left to 0, and the decoder will allocate new surfaces on demand | |
| * during decoding. | |
| * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying | |
| * hardware API. | |
| * | |
| * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but | |
| * with basic frame parameters set. | |
| * | |
| * The function is stateless, and does not change the AVCodecContext or the | |
| * device_ref AVHWDeviceContext. | |
| * | |
| * @param avctx The context which is currently calling get_format, and which | |
| * implicitly contains all state needed for filling the returned | |
| * AVHWFramesContext properly. | |
| * @param device_ref A reference to the AVHWDeviceContext describing the device | |
| * which will be used by the hardware decoder. | |
| * @param hw_pix_fmt The hwaccel format you are going to return from get_format. | |
| * @param out_frames_ref On success, set to a reference to an _uninitialized_ | |
| * AVHWFramesContext, created from the given device_ref. | |
| * Fields will be set to values required for decoding. | |
| * Not changed if an error is returned. | |
| * @return zero on success, a negative value on error. The following error codes | |
| * have special semantics: | |
| * AVERROR(ENOENT): the decoder does not support this functionality. Setup | |
| * is always manual, or it is a decoder which does not | |
| * support setting AVCodecContext.hw_frames_ctx at all, | |
| * or it is a software format. | |
| * AVERROR(EINVAL): it is known that hardware decoding is not supported for | |
| * this configuration, or the device_ref is not supported | |
| * for the hwaccel referenced by hw_pix_fmt. | |
| */ | |
| int avcodec_get_hw_frames_parameters(AVCodecContext *avctx, | |
| AVBufferRef *device_ref, | |
| enum AVPixelFormat hw_pix_fmt, | |
| AVBufferRef **out_frames_ref); | |
| /** | |
| * @defgroup lavc_parsing Frame parsing | |
| * @{ | |
| */ | |
| enum AVPictureStructure { | |
| AV_PICTURE_STRUCTURE_UNKNOWN, ///< unknown | |
| AV_PICTURE_STRUCTURE_TOP_FIELD, ///< coded as top field | |
| AV_PICTURE_STRUCTURE_BOTTOM_FIELD, ///< coded as bottom field | |
| AV_PICTURE_STRUCTURE_FRAME, ///< coded as frame | |
| }; | |
| typedef struct AVCodecParserContext { | |
| void *priv_data; | |
| const struct AVCodecParser *parser; | |
| int64_t frame_offset; /* offset of the current frame */ | |
| int64_t cur_offset; /* current offset | |
| (incremented by each av_parser_parse()) */ | |
| int64_t next_frame_offset; /* offset of the next frame */ | |
| /* video info */ | |
| int pict_type; /* XXX: Put it back in AVCodecContext. */ | |
| /** | |
| * This field is used for proper frame duration computation in lavf. | |
| * It signals, how much longer the frame duration of the current frame | |
| * is compared to normal frame duration. | |
| * | |
| * frame_duration = (1 + repeat_pict) * time_base | |
| * | |
| * It is used by codecs like H.264 to display telecined material. | |
| */ | |
| int repeat_pict; /* XXX: Put it back in AVCodecContext. */ | |
| int64_t pts; /* pts of the current frame */ | |
| int64_t dts; /* dts of the current frame */ | |
| /* private data */ | |
| int64_t last_pts; | |
| int64_t last_dts; | |
| int fetch_timestamp; | |
| int cur_frame_start_index; | |
| int64_t cur_frame_offset[AV_PARSER_PTS_NB]; | |
| int64_t cur_frame_pts[AV_PARSER_PTS_NB]; | |
| int64_t cur_frame_dts[AV_PARSER_PTS_NB]; | |
| int flags; | |
| /// Set if the parser has a valid file offset | |
| int64_t offset; ///< byte offset from starting packet start | |
| int64_t cur_frame_end[AV_PARSER_PTS_NB]; | |
| /** | |
| * Set by parser to 1 for key frames and 0 for non-key frames. | |
| * It is initialized to -1, so if the parser doesn't set this flag, | |
| * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames | |
| * will be used. | |
| */ | |
| int key_frame; | |
| // Timestamp generation support: | |
| /** | |
| * Synchronization point for start of timestamp generation. | |
| * | |
| * Set to >0 for sync point, 0 for no sync point and <0 for undefined | |
| * (default). | |
| * | |
| * For example, this corresponds to presence of H.264 buffering period | |
| * SEI message. | |
| */ | |
| int dts_sync_point; | |
| /** | |
| * Offset of the current timestamp against last timestamp sync point in | |
| * units of AVCodecContext.time_base. | |
| * | |
| * Set to INT_MIN when dts_sync_point unused. Otherwise, it must | |
| * contain a valid timestamp offset. | |
| * | |
| * Note that the timestamp of sync point has usually a nonzero | |
| * dts_ref_dts_delta, which refers to the previous sync point. Offset of | |
| * the next frame after timestamp sync point will be usually 1. | |
| * | |
| * For example, this corresponds to H.264 cpb_removal_delay. | |
| */ | |
| int dts_ref_dts_delta; | |
| /** | |
| * Presentation delay of current frame in units of AVCodecContext.time_base. | |
| * | |
| * Set to INT_MIN when dts_sync_point unused. Otherwise, it must | |
| * contain valid non-negative timestamp delta (presentation time of a frame | |
| * must not lie in the past). | |
| * | |
| * This delay represents the difference between decoding and presentation | |
| * time of the frame. | |
| * | |
| * For example, this corresponds to H.264 dpb_output_delay. | |
| */ | |
| int pts_dts_delta; | |
| /** | |
| * Position of the packet in file. | |
| * | |
| * Analogous to cur_frame_pts/dts | |
| */ | |
| int64_t cur_frame_pos[AV_PARSER_PTS_NB]; | |
| /** | |
| * Byte position of currently parsed frame in stream. | |
| */ | |
| int64_t pos; | |
| /** | |
| * Previous frame byte position. | |
| */ | |
| int64_t last_pos; | |
| /** | |
| * Duration of the current frame. | |
| * For audio, this is in units of 1 / AVCodecContext.sample_rate. | |
| * For all other types, this is in units of AVCodecContext.time_base. | |
| */ | |
| int duration; | |
| enum AVFieldOrder field_order; | |
| /** | |
| * Indicate whether a picture is coded as a frame, top field or bottom field. | |
| * | |
| * For example, H.264 field_pic_flag equal to 0 corresponds to | |
| * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag | |
| * equal to 1 and bottom_field_flag equal to 0 corresponds to | |
| * AV_PICTURE_STRUCTURE_TOP_FIELD. | |
| */ | |
| enum AVPictureStructure picture_structure; | |
| /** | |
| * Picture number incremented in presentation or output order. | |
| * This field may be reinitialized at the first picture of a new sequence. | |
| * | |
| * For example, this corresponds to H.264 PicOrderCnt. | |
| */ | |
| int output_picture_number; | |
| /** | |
| * Dimensions of the decoded video intended for presentation. | |
| */ | |
| int width; | |
| int height; | |
| /** | |
| * Dimensions of the coded video. | |
| */ | |
| int coded_width; | |
| int coded_height; | |
| /** | |
| * The format of the coded data, corresponds to enum AVPixelFormat for video | |
| * and for enum AVSampleFormat for audio. | |
| * | |
| * Note that a decoder can have considerable freedom in how exactly it | |
| * decodes the data, so the format reported here might be different from the | |
| * one returned by a decoder. | |
| */ | |
| int format; | |
| } AVCodecParserContext; | |
| typedef struct AVCodecParser { | |
| int codec_ids[7]; /* several codec IDs are permitted */ | |
| int priv_data_size; | |
| int (*parser_init)(AVCodecParserContext *s); | |
| /* This callback never returns an error, a negative value means that | |
| * the frame start was in a previous packet. */ | |
| int (*parser_parse)(AVCodecParserContext *s, | |
| AVCodecContext *avctx, | |
| const uint8_t **poutbuf, int *poutbuf_size, | |
| const uint8_t *buf, int buf_size); | |
| void (*parser_close)(AVCodecParserContext *s); | |
| int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size); | |
| } AVCodecParser; | |
| /** | |
| * Iterate over all registered codec parsers. | |
| * | |
| * @param opaque a pointer where libavcodec will store the iteration state. Must | |
| * point to NULL to start the iteration. | |
| * | |
| * @return the next registered codec parser or NULL when the iteration is | |
| * finished | |
| */ | |
| const AVCodecParser *av_parser_iterate(void **opaque); | |
| AVCodecParserContext *av_parser_init(int codec_id); | |
| /** | |
| * Parse a packet. | |
| * | |
| * @param s parser context. | |
| * @param avctx codec context. | |
| * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished. | |
| * @param poutbuf_size set to size of parsed buffer or zero if not yet finished. | |
| * @param buf input buffer. | |
| * @param buf_size buffer size in bytes without the padding. I.e. the full buffer | |
| size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE. | |
| To signal EOF, this should be 0 (so that the last frame | |
| can be output). | |
| * @param pts input presentation timestamp. | |
| * @param dts input decoding timestamp. | |
| * @param pos input byte position in stream. | |
| * @return the number of bytes of the input bitstream used. | |
| * | |
| * Example: | |
| * @code | |
| * while(in_len){ | |
| * len = av_parser_parse2(myparser, AVCodecContext, &data, &size, | |
| * in_data, in_len, | |
| * pts, dts, pos); | |
| * in_data += len; | |
| * in_len -= len; | |
| * | |
| * if(size) | |
| * decode_frame(data, size); | |
| * } | |
| * @endcode | |
| */ | |
| int av_parser_parse2(AVCodecParserContext *s, | |
| AVCodecContext *avctx, | |
| uint8_t **poutbuf, int *poutbuf_size, | |
| const uint8_t *buf, int buf_size, | |
| int64_t pts, int64_t dts, | |
| int64_t pos); | |
| void av_parser_close(AVCodecParserContext *s); | |
| /** | |
| * @} | |
| * @} | |
| */ | |
| /** | |
| * @addtogroup lavc_encoding | |
| * @{ | |
| */ | |
| int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, | |
| const AVSubtitle *sub); | |
| /** | |
| * @} | |
| */ | |
| /** | |
| * @defgroup lavc_misc Utility functions | |
| * @ingroup libavc | |
| * | |
| * Miscellaneous utility functions related to both encoding and decoding | |
| * (or neither). | |
| * @{ | |
| */ | |
| /** | |
| * @defgroup lavc_misc_pixfmt Pixel formats | |
| * | |
| * Functions for working with pixel formats. | |
| * @{ | |
| */ | |
| /** | |
| * Return a value representing the fourCC code associated to the | |
| * pixel format pix_fmt, or 0 if no associated fourCC code can be | |
| * found. | |
| */ | |
| unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt); | |
| /** | |
| * Find the best pixel format to convert to given a certain source pixel | |
| * format. When converting from one pixel format to another, information loss | |
| * may occur. For example, when converting from RGB24 to GRAY, the color | |
| * information will be lost. Similarly, other losses occur when converting from | |
| * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of | |
| * the given pixel formats should be used to suffer the least amount of loss. | |
| * The pixel formats from which it chooses one, are determined by the | |
| * pix_fmt_list parameter. | |
| * | |
| * | |
| * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from | |
| * @param[in] src_pix_fmt source pixel format | |
| * @param[in] has_alpha Whether the source pixel format alpha channel is used. | |
| * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur. | |
| * @return The best pixel format to convert to or -1 if none was found. | |
| */ | |
| enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, | |
| enum AVPixelFormat src_pix_fmt, | |
| int has_alpha, int *loss_ptr); | |
| enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt); | |
| /** | |
| * @} | |
| */ | |
| void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode); | |
| int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size); | |
| int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count); | |
| //FIXME func typedef | |
| /** | |
| * Fill AVFrame audio data and linesize pointers. | |
| * | |
| * The buffer buf must be a preallocated buffer with a size big enough | |
| * to contain the specified samples amount. The filled AVFrame data | |
| * pointers will point to this buffer. | |
| * | |
| * AVFrame extended_data channel pointers are allocated if necessary for | |
| * planar audio. | |
| * | |
| * @param frame the AVFrame | |
| * frame->nb_samples must be set prior to calling the | |
| * function. This function fills in frame->data, | |
| * frame->extended_data, frame->linesize[0]. | |
| * @param nb_channels channel count | |
| * @param sample_fmt sample format | |
| * @param buf buffer to use for frame data | |
| * @param buf_size size of buffer | |
| * @param align plane size sample alignment (0 = default) | |
| * @return >=0 on success, negative error code on failure | |
| * @todo return the size in bytes required to store the samples in | |
| * case of success, at the next libavutil bump | |
| */ | |
| int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, | |
| enum AVSampleFormat sample_fmt, const uint8_t *buf, | |
| int buf_size, int align); | |
| /** | |
| * Reset the internal codec state / flush internal buffers. Should be called | |
| * e.g. when seeking or when switching to a different stream. | |
| * | |
| * @note for decoders, this function just releases any references the decoder | |
| * might keep internally, but the caller's references remain valid. | |
| * | |
| * @note for encoders, this function will only do something if the encoder | |
| * declares support for AV_CODEC_CAP_ENCODER_FLUSH. When called, the encoder | |
| * will drain any remaining packets, and can then be re-used for a different | |
| * stream (as opposed to sending a null frame which will leave the encoder | |
| * in a permanent EOF state after draining). This can be desirable if the | |
| * cost of tearing down and replacing the encoder instance is high. | |
| */ | |
| void avcodec_flush_buffers(AVCodecContext *avctx); | |
| /** | |
| * Return audio frame duration. | |
| * | |
| * @param avctx codec context | |
| * @param frame_bytes size of the frame, or 0 if unknown | |
| * @return frame duration, in samples, if known. 0 if not able to | |
| * determine. | |
| */ | |
| int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes); | |
| /* memory */ | |
| /** | |
| * Same behaviour av_fast_malloc but the buffer has additional | |
| * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0. | |
| * | |
| * In addition the whole buffer will initially and after resizes | |
| * be 0-initialized so that no uninitialized data will ever appear. | |
| */ | |
| void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size); | |
| /** | |
| * Same behaviour av_fast_padded_malloc except that buffer will always | |
| * be 0-initialized after call. | |
| */ | |
| void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size); | |
| /** | |
| * @return a positive value if s is open (i.e. avcodec_open2() was called on it | |
| * with no corresponding avcodec_close()), 0 otherwise. | |
| */ | |
| int avcodec_is_open(AVCodecContext *s); | |
| /** | |
| * @} | |
| */ | |