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| author | Anatoly Nenashev <anatoly.nenashev@ovsoft.ru> | 2011-02-10 16:09:48 +0000 |
|---|---|---|
| committer | Mans Rullgard <mans@mansr.com> | 2011-02-13 16:22:14 +0000 |
| commit | 7a4abe5912405474039198823d451b2a38361c48 (patch) | |
| tree | 5d3da001ab59dc034d003cd13e0e75803b9452a5 /libavcodec | |
| parent | 5d57846bba7010dc6ee65c3503dd06600e5441a5 (diff) | |
| download | ffmpeg-7a4abe5912405474039198823d451b2a38361c48.tar.gz | |
mpeg4video: ignore broken GOP headers
Some MPEG4 cameras produce files with empty GOP headers.
This patch makes the decoder ignore such broken headers and proceed
with the following I-frame. Without this change, the following
start code is missed resulting in the entire I-frame being skipped.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/mpeg4videodec.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c index 673c4e865c..617dcb9f18 100644 --- a/libavcodec/mpeg4videodec.c +++ b/libavcodec/mpeg4videodec.c @@ -1494,16 +1494,17 @@ end: static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){ int hours, minutes, seconds; - - hours= get_bits(gb, 5); - minutes= get_bits(gb, 6); - skip_bits1(gb); - seconds= get_bits(gb, 6); - - s->time_base= seconds + 60*(minutes + 60*hours); - - skip_bits1(gb); - skip_bits1(gb); + unsigned time_code = show_bits(gb, 18); + + if (time_code & 0x40) { /* marker_bit */ + hours = time_code >> 13; + minutes = time_code >> 7 & 0x3f; + seconds = time_code & 0x3f; + s->time_base = seconds + 60*(minutes + 60*hours); + skip_bits(gb, 20); /* time_code, closed_gov, broken_link */ + } else { + av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n"); + } return 0; } |