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Implemented getting the number of FPS for an AVC video track from the MP4 file.

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This commit is contained in:
Moritz Bunkus 2005-01-10 21:29:55 +00:00
parent 273a7db8cb
commit 9ccac1e5b7
1 changed files with 44 additions and 1 deletions
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45
src/input/r_qtmp4.cpp
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@ -1396,14 +1396,57 @@ qtmp4_reader_c::create_packetizer(int64_t tid) {
dmx->v_height, false, ti));
} else if (!strncasecmp(dmx->fourcc, "avc1", 4)) {
double fps;
fps = 0.0;
if ((dmx->durmap_table.size() == 1) &&
(dmx->durmap_table[0].duration != 0)) {
if ((dmx->sample_size != 0) ||
(dmx->frame_offset_table.size() == 0)) {
// Constant FPS. Let's set the default duration.
fps = (double)dmx->timescale /
(double)dmx->durmap_table[0].duration;
mxverb(3, PFX "fps1: %f\n", fps);
} else if ((dmx->sample_table.size() > 0) &&
(dmx->sample_table.size() ==
dmx->frame_offset_table.size())) {
// Constant FPS but the frame offsets are used. This one is
// a bit trickier. I have to find the maximum timecode including
// the frame offsets (for PTS/DTS conversion) and divide that
// by the number of frames.
int64_t max_tc;
int i;
max_tc = 0;
for (i = 0; i < dmx->sample_table.size(); i++) {
int64_t timecode;
timecode = ((int64_t)dmx->sample_table[i].pts +
(int64_t)dmx->frame_offset_table[dmx->pos]) *
1000000000 / dmx->timescale;
if (timecode > max_tc)
max_tc = timecode;
}
if (max_tc > 0)
fps = (double)dmx->sample_table.size() * 1000000000.0 /
(double)max_tc;
mxverb(3, PFX "fps2: max_tc %lld s_t.s %u fps %f\n", max_tc,
dmx->sample_table.size(), fps);
}
}
ti->private_size = dmx->priv_size;
ti->private_data = dmx->priv;
dmx->ptzr =
add_packetizer(new video_packetizer_c(this, MKV_V_MPEG4_AVC, 0.0,
add_packetizer(new video_packetizer_c(this, MKV_V_MPEG4_AVC, fps,
dmx->v_width, dmx->v_height,
false, ti));
ti->private_data = NULL;
} else {
ti->private_size = dmx->v_stsd_size;
ti->private_data = (unsigned char *)dmx->v_stsd;