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[FFmpeg-devel,1/2] avformat/mvdec: read frame rate from data stream

Message ID 20211218204628.22664-1-jpstewart@personalprojects.net
State Accepted
Commit 3c9ffbd009243b3e83ba20956ff6401918376073
Headers show
Series [FFmpeg-devel,1/2] avformat/mvdec: read frame rate from data stream | expand

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Commit Message

John-Paul Stewart Dec. 18, 2021, 8:46 p.m. UTC 
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>
---
 libavformat/mvdec.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
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Patch

diff --git a/libavformat/mvdec.c b/libavformat/mvdec.c
index 5d184f20a4..a5c5b205a6 100644
--- a/libavformat/mvdec.c
+++ b/libavformat/mvdec.c
@@ -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) {