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#include <inttypes.h> |
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#include "libavutil/dict.h" |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "apetag.h" |
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#include "demux.h" |
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#include "internal.h" |
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#include "mux.h" |
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#define APE_TAG_FLAG_CONTAINS_HEADER (1U << 31) |
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#define APE_TAG_FLAG_LACKS_FOOTER (1 << 30) |
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#define APE_TAG_FLAG_IS_HEADER (1 << 29) |
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#define APE_TAG_FLAG_IS_BINARY (1 << 1) |
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static int ape_tag_read_field(AVFormatContext *s) |
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{ |
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AVIOContext *pb = s->pb; |
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uint8_t key[1024], *value; |
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int64_t size, flags; |
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int i, c; |
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size = avio_rl32(pb); |
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flags = avio_rl32(pb); |
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for (i = 0; i < sizeof(key) - 1; i++) { |
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c = avio_r8(pb); |
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if (c < 0x20 || c > 0x7E) |
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break; |
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else |
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key[i] = c; |
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} |
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key[i] = 0; |
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if (c != 0) { |
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av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key); |
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return -1; |
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} |
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if (size > INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE) { |
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av_log(s, AV_LOG_ERROR, "APE tag size too large.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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if (flags & APE_TAG_FLAG_IS_BINARY) { |
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uint8_t filename[1024]; |
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enum AVCodecID id; |
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int ret; |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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ret = avio_get_str(pb, size, filename, sizeof(filename)); |
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if (ret < 0) |
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return ret; |
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if (size <= ret) { |
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av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key); |
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return 0; |
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} |
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size -= ret; |
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av_dict_set(&st->metadata, key, filename, 0); |
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if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) { |
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int ret = ff_add_attached_pic(s, st, s->pb, NULL, size); |
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if (ret < 0) { |
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av_log(s, AV_LOG_ERROR, "Error reading cover art.\n"); |
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return ret; |
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} |
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st->codecpar->codec_id = id; |
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} else { |
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if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0) |
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return ret; |
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st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT; |
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} |
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} else { |
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value = av_malloc(size+1); |
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if (!value) |
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return AVERROR(ENOMEM); |
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c = avio_read(pb, value, size); |
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if (c < 0) { |
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av_free(value); |
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return c; |
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} |
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value[c] = 0; |
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av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); |
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} |
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return 0; |
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} |
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int64_t ff_ape_parse_tag(AVFormatContext *s) |
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{ |
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AVIOContext *pb = s->pb; |
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int64_t file_size = avio_size(pb); |
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uint32_t val, fields, tag_bytes; |
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uint8_t buf[8]; |
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int64_t tag_start; |
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int i; |
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if (file_size < APE_TAG_FOOTER_BYTES) |
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return 0; |
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avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET); |
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avio_read(pb, buf, 8); |
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if (strncmp(buf, APE_TAG_PREAMBLE, 8)) { |
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return 0; |
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} |
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val = avio_rl32(pb); |
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if (val > APE_TAG_VERSION) { |
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av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION); |
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return 0; |
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} |
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tag_bytes = avio_rl32(pb); |
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if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) { |
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av_log(s, AV_LOG_ERROR, "Tag size is way too big\n"); |
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return 0; |
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} |
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if (tag_bytes > file_size - APE_TAG_FOOTER_BYTES) { |
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av_log(s, AV_LOG_ERROR, "Invalid tag size %"PRIu32".\n", tag_bytes); |
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return 0; |
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} |
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fields = avio_rl32(pb); |
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if (fields > 65536) { |
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av_log(s, AV_LOG_ERROR, "Too many tag fields (%"PRIu32")\n", fields); |
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return 0; |
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} |
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val = avio_rl32(pb); |
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if (val & APE_TAG_FLAG_IS_HEADER) { |
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av_log(s, AV_LOG_ERROR, "APE Tag is a header\n"); |
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return 0; |
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} |
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avio_seek(pb, file_size - tag_bytes, SEEK_SET); |
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if (val & APE_TAG_FLAG_CONTAINS_HEADER) |
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tag_bytes += APE_TAG_HEADER_BYTES; |
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tag_start = file_size - tag_bytes; |
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for (i=0; i<fields; i++) |
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if (ape_tag_read_field(s) < 0) break; |
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return tag_start; |
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} |
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static int string_is_ascii(const uint8_t *str) |
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{ |
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while (*str && *str >= 0x20 && *str <= 0x7e ) str++; |
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return !*str; |
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} |
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int ff_ape_write_tag(AVFormatContext *s) |
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{ |
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const AVDictionaryEntry *e = NULL; |
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int size, ret, count = 0; |
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AVIOContext *dyn_bc; |
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uint8_t *dyn_buf; |
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if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0) |
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return ret; |
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ff_standardize_creation_time(s); |
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while ((e = av_dict_iterate(s->metadata, e))) { |
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int val_len; |
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if (!string_is_ascii(e->key)) { |
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av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n"); |
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continue; |
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} |
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val_len = strlen(e->value); |
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avio_wl32(dyn_bc, val_len); |
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avio_wl32(dyn_bc, 0); |
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avio_put_str(dyn_bc, e->key); |
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avio_write(dyn_bc, e->value, val_len); |
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count++; |
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} |
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if (!count) |
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goto end; |
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size = avio_get_dyn_buf(dyn_bc, &dyn_buf); |
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if (size <= 0) |
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goto end; |
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size += APE_TAG_FOOTER_BYTES; |
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avio_write(s->pb, "APETAGEX", 8); |
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avio_wl32(s->pb, APE_TAG_VERSION); |
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avio_wl32(s->pb, size); |
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avio_wl32(s->pb, count); |
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avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_IS_HEADER); |
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ffio_fill(s->pb, 0, 8); |
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avio_write(s->pb, dyn_buf, size - APE_TAG_FOOTER_BYTES); |
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avio_write(s->pb, "APETAGEX", 8); |
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avio_wl32(s->pb, APE_TAG_VERSION); |
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avio_wl32(s->pb, size); |
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avio_wl32(s->pb, count); |
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avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER); |
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ffio_fill(s->pb, 0, 8); |
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end: |
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ffio_free_dyn_buf(&dyn_bc); |
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return ret; |
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} |
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