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avformat/mvdec: read frame rate from data stream

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Prior to this patch, for version 2 of the file format the frame rate was
hard-coded at 15 fps.  This uses the 64-bit floating-point value from
the data stream, similar to what is already done for version 3 of the
file format (around line 206).

Signed-off-by: John-Paul Stewart <jpstewart@personalprojects.net>
Reviewed-by: Peter Ross <pross@xvid.org>
This commit is contained in:
John-Paul Stewart 2021-12-18 15:46:27 -05:00 committed by Peter Ross
parent 15cfb4eee3
commit 3c9ffbd009
1 changed files with 7 additions and 3 deletions
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10
libavformat/mvdec.c
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@ -26,6 +26,7 @@
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/rational.h"
@ -300,8 +301,9 @@ static int mv_read_header(AVFormatContext *avctx)
uint64_t timestamp;
int v;
uint32_t bytes_per_sample;
AVRational fps;
avio_skip(pb, 22);
avio_skip(pb, 10);
/* allocate audio track first to prevent unnecessary seeking
* (audio packet always precede video packet for a given frame) */
@ -312,9 +314,11 @@ static int mv_read_header(AVFormatContext *avctx)
vst = avformat_new_stream(avctx, NULL);
if (!vst)
return AVERROR(ENOMEM);
avpriv_set_pts_info(vst, 64, 1, 15);
fps = av_d2q(av_int2double(avio_rb64(pb)), INT_MAX);
avpriv_set_pts_info(vst, 64, fps.den, fps.num);
avio_skip(pb, 4);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->avg_frame_rate = av_inv_q(vst->time_base);
vst->avg_frame_rate = fps;
vst->nb_frames = avio_rb32(pb);
v = avio_rb32(pb);
switch (v) {