| /* | |
| * 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 | |
| */ | |
| /* minimum number of bytes to read from a DV stream in order to | |
| * determine the profile */ | |
| /* | |
| * AVDVProfile is used to express the differences between various | |
| * DV flavors. For now it's primarily used for differentiating | |
| * 525/60 and 625/50, but the plans are to use it for various | |
| * DV specs as well (e.g. SMPTE314M vs. IEC 61834). | |
| */ | |
| typedef struct AVDVProfile { | |
| int dsf; /* value of the dsf in the DV header */ | |
| int video_stype; /* stype for VAUX source pack */ | |
| int frame_size; /* total size of one frame in bytes */ | |
| int difseg_size; /* number of DIF segments per DIF channel */ | |
| int n_difchan; /* number of DIF channels per frame */ | |
| AVRational time_base; /* 1/framerate */ | |
| int ltc_divisor; /* FPS from the LTS standpoint */ | |
| int height; /* picture height in pixels */ | |
| int width; /* picture width in pixels */ | |
| AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */ | |
| enum AVPixelFormat pix_fmt; /* picture pixel format */ | |
| int bpm; /* blocks per macroblock */ | |
| const uint8_t *block_sizes; /* AC block sizes, in bits */ | |
| int audio_stride; /* size of audio_shuffle table */ | |
| int audio_min_samples[3]; /* min amount of audio samples */ | |
| /* for 48kHz, 44.1kHz and 32kHz */ | |
| int audio_samples_dist[5]; /* how many samples are supposed to be */ | |
| /* in each frame in a 5 frames window */ | |
| const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */ | |
| } AVDVProfile; | |
| /** | |
| * Get a DV profile for the provided compressed frame. | |
| * | |
| * @param sys the profile used for the previous frame, may be NULL | |
| * @param frame the compressed data buffer | |
| * @param buf_size size of the buffer in bytes | |
| * @return the DV profile for the supplied data or NULL on failure | |
| */ | |
| const AVDVProfile *av_dv_frame_profile(const AVDVProfile *sys, | |
| const uint8_t *frame, unsigned buf_size); | |
| /** | |
| * Get a DV profile for the provided stream parameters. | |
| */ | |
| const AVDVProfile *av_dv_codec_profile(int width, int height, enum AVPixelFormat pix_fmt); | |
| /** | |
| * Get a DV profile for the provided stream parameters. | |
| * The frame rate is used as a best-effort parameter. | |
| */ | |
| const AVDVProfile *av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate); | |