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avformat/movenc: use AVProducerReferenceTime side data to write the prft atom 

If not available, set flags to 24 (bits 4 and 5), to signal the wallclock value
is read at the time of writing the atom.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2019-10-04 12:04:17 -03:00
parent 4e4ac20340
commit 7abc0979e6
2 changed files with 17 additions and 2 deletions
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18
libavformat/movenc.c
View File

@ -4630,6 +4630,7 @@ static int mov_write_prft_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks)
{
int64_t pos = avio_tell(pb), pts_us, ntp_ts;
MOVTrack *first_track;
int flags = 24;
/* PRFT should be associated with at most one track. So, choosing only the
* first track. */
@ -4648,7 +4649,11 @@ static int mov_write_prft_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks)
}
if (mov->write_prft == MOV_PRFT_SRC_WALLCLOCK) {
ntp_ts = ff_get_formatted_ntp_time(ff_ntp_time(av_gettime()));
if (first_track->cluster[0].prft.wallclock) {
ntp_ts = ff_get_formatted_ntp_time(ff_ntp_time(first_track->cluster[0].prft.wallclock));
flags = first_track->cluster[0].prft.flags;
} else
ntp_ts = ff_get_formatted_ntp_time(ff_ntp_time(av_gettime()));
} else if (mov->write_prft == MOV_PRFT_SRC_PTS) {
pts_us = av_rescale_q(first_track->cluster[0].pts,
first_track->st->time_base, AV_TIME_BASE_Q);
@ -4662,7 +4667,7 @@ static int mov_write_prft_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks)
avio_wb32(pb, 0); // Size place holder
ffio_wfourcc(pb, "prft"); // Type
avio_w8(pb, 1); // Version
avio_wb24(pb, 0); // Flags
avio_wb24(pb, flags); // Flags
avio_wb32(pb, first_track->track_id); // reference track ID
avio_wb64(pb, ntp_ts); // NTP time stamp
avio_wb64(pb, first_track->cluster[0].pts); //media time
@ -5356,8 +5361,10 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
AVIOContext *pb = s->pb;
MOVTrack *trk = &mov->tracks[pkt->stream_index];
AVCodecParameters *par = trk->par;
AVProducerReferenceTime *prft;
unsigned int samples_in_chunk = 0;
int size = pkt->size, ret = 0;
int prft_size;
uint8_t *reformatted_data = NULL;
ret = check_pkt(s, pkt);
@ -5629,6 +5636,13 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
trk->cluster[trk->entry].flags |= MOV_DISPOSABLE_SAMPLE;
trk->has_disposable++;
}
prft = (AVProducerReferenceTime *)av_packet_get_side_data(pkt, AV_PKT_DATA_PRFT, &prft_size);
if (prft && prft_size == sizeof(AVProducerReferenceTime))
memcpy(&trk->cluster[trk->entry].prft, prft, prft_size);
else
memset(&trk->cluster[trk->entry].prft, 0, sizeof(AVProducerReferenceTime));
trk->entry++;
trk->sample_count += samples_in_chunk;
mov->mdat_size += size;

1
libavformat/movenc.h
View File

@ -56,6 +56,7 @@ typedef struct MOVIentry {
#define MOV_PARTIAL_SYNC_SAMPLE 0x0002
#define MOV_DISPOSABLE_SAMPLE 0x0004
uint32_t flags;
AVProducerReferenceTime prft;
} MOVIentry;
typedef struct HintSample {