On Sun, 29 Apr 2018 at 22:57 Michael Niedermayer <mich...@niedermayer.cc>
wrote:
> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
> ---
> libavformat/m4vdec.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/libavformat/m4vdec.c b/libavformat/m4vdec.c
> index 34d434f7d2..be30f86a5c 100644
> --- a/libavformat/m4vdec.c
> +++ b/libavformat/m4vdec.c
> @@ -29,6 +29,7 @@ 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 +47,16 @@ static int mpeg4video_probe(AVProbeData *probe_packet)
> VO++;
> else if (temp_buffer >= 0x120 && temp_buffer < 0x130)
> VOL++;
> + else if (temp_buffer == 0x1B7 || temp_buffer == 0x1B8)
> + res_main++;
> else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) &&
> !(0x1B9 < temp_buffer && temp_buffer < 0x1C4))
> res++;
> }
>
> + 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;
>
Lots of interesting made up numbers here, explanation would be great.
Kieran
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