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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-04-29 23:56:14 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-04-30 20:39:56 +0200 |
| commit | 34dbdcfc20d69b7b67fd13112445cd05b9b5d979 (patch) | |
| tree | 2910b7c184b0ddef8025d37ae80a7e1abcced989 /libavformat/m4vdec.c | |
| parent | cae6f806a6367c7760ab6ed059d343d4a8eebd56 (diff) | |
avformat/m4vdec: Fix detection of raw MPEG-4 ES Studio
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavformat/m4vdec.c')
| -rw-r--r-- | libavformat/m4vdec.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/libavformat/m4vdec.c b/libavformat/m4vdec.c index 34d434f7d2..ebc7ab4f81 100644 --- a/libavformat/m4vdec.c +++ b/libavformat/m4vdec.c @@ -24,11 +24,14 @@ #define VISUAL_OBJECT_START_CODE 0x000001b5 #define VOP_START_CODE 0x000001b6 +#define SLICE_STARTCODE 0x1B7 +#define EXT_STARTCODE 0x1B8 static int mpeg4video_probe(AVProbeData *probe_packet) { uint32_t temp_buffer = -1; int VO = 0, VOL = 0, VOP = 0, VISO = 0, res = 0; + int res_main = 0; int i; for (i = 0; i < probe_packet->buf_size; i++) { @@ -46,11 +49,19 @@ static int mpeg4video_probe(AVProbeData *probe_packet) VO++; else if (temp_buffer >= 0x120 && temp_buffer < 0x130) VOL++; + else if (temp_buffer == SLICE_STARTCODE || temp_buffer == EXT_STARTCODE) + res_main++; else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++; } + // res_main repesents the reserved codes within the "main" profile, they are + // added to the reserved ones if it appears that this is a "main" profile + // stream + if (res_main && 2*res_main < VOP) + res += res_main; + if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res == 0) return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2; |