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| author | Alexander Kojevnikov <alexander@kojevnikov.com> | 2013-03-06 21:38:55 -0800 |
|---|---|---|
| committer | Anton Khirnov <anton@khirnov.net> | 2013-03-08 07:32:11 +0100 |
| commit | eae0879d961b78717dd2a0899809ad22819ae9e3 (patch) | |
| tree | 50091c13c60aca3bf5dc5a045d0419ec91e0d144 /libavformat/mp3dec.c | |
| parent | 4be368b504c6f4a03051448728fc62cd0ed506b2 (diff) | |
| download | ffmpeg-eae0879d961b78717dd2a0899809ad22819ae9e3.tar.gz | |
mp3dec: Fix VBR bit rate parsing
When parsing the Xing/Info tag, don't set the bit rate if it's an Info tag.
When parsing the stream, don't override the bit rate if it's already set,
otherwise calculate the mean bit rate from parsed frames. This way, the bit
rate will be set correctly both for CBR and VBR streams.
CC:libav-stable@libav.org
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Diffstat (limited to 'libavformat/mp3dec.c')
| -rw-r--r-- | libavformat/mp3dec.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavformat/mp3dec.c b/libavformat/mp3dec.c index 7d0c2fb6ed..48deefd126 100644 --- a/libavformat/mp3dec.c +++ b/libavformat/mp3dec.c @@ -128,6 +128,7 @@ static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base) const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}}; MPADecodeHeader c; int vbrtag_size = 0; + int is_cbr; v = avio_rb32(s->pb); if(ff_mpa_check_header(v) < 0) @@ -143,7 +144,8 @@ static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base) /* Check for Xing / Info tag */ avio_skip(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1]); v = avio_rb32(s->pb); - if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) { + is_cbr = v == MKBETAG('I', 'n', 'f', 'o'); + if (v == MKBETAG('X', 'i', 'n', 'g') || is_cbr) { v = avio_rb32(s->pb); if(v & XING_FLAG_FRAMES) frames = avio_rb32(s->pb); @@ -176,7 +178,7 @@ static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base) if(frames) st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate}, st->time_base); - if(size && frames) + if (size && frames && !is_cbr) st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf); return 0; |