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a/v sync support: added correct pts handling

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Originally committed as revision 1229 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2002-11-19 15:52:29 +00:00
parent 8949367ea5
commit 45dd5c69f9
2 changed files with 31 additions and 11 deletions
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35
libav/audio.c
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@ -220,21 +220,25 @@ static int audio_read_header(AVFormatContext *s1, AVFormatParameters *ap)
if (ret < 0) {
av_free(st);
return -EIO;
} else {
/* take real parameters */
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_id = s->codec_id;
st->codec.sample_rate = s->sample_rate;
st->codec.channels = s->channels;
return 0;
}
/* take real parameters */
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_id = s->codec_id;
st->codec.sample_rate = s->sample_rate;
st->codec.channels = s->channels;
av_set_pts_info(s1, 48, 1, 1000000); /* 48 bits pts in us */
return 0;
}
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
AudioData *s = s1->priv_data;
int ret;
int ret, bdelay;
int64_t cur_time;
struct audio_buf_info abufi;
if (av_new_packet(pkt, s->frame_size) < 0)
return -EIO;
for(;;) {
@ -252,6 +256,19 @@ static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
}
}
pkt->size = ret;
/* compute pts of the start of the packet */
cur_time = av_gettime();
bdelay = ret;
if (ioctl(s->fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) {
bdelay += abufi.bytes;
}
/* substract time represented by the number of bytes in the audio fifo */
cur_time -= (bdelay * 1000000LL) / (s->sample_rate * s->channels);
/* convert to wanted units */
pkt->pts = cur_time & ((1LL << 48) - 1);
if (s->flip_left && s->channels == 2) {
int i;
short *p = (short *) pkt->data;

7
libav/grab.c
View File

@ -240,6 +240,8 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
st->codec.height = height;
st->codec.frame_rate = frame_rate;
av_set_pts_info(s1, 48, 1, 1000000); /* 48 bits pts in us */
return 0;
fail:
if (video_fd >= 0)
@ -279,7 +281,6 @@ static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
VideoData *s = s1->priv_data;
INT64 curtime, delay;
struct timespec ts;
int first;
INT64 per_frame = (INT64_C(1000000) * FRAME_RATE_BASE) / s->frame_rate;
int dropped = 0;
@ -287,7 +288,7 @@ static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
s->time_frame += per_frame;
/* wait based on the frame rate */
for(first = 1;; first = 0) {
for(;;) {
curtime = av_gettime();
delay = s->time_frame - curtime;
if (delay <= 0) {
@ -306,6 +307,8 @@ static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
if (av_new_packet(pkt, s->frame_size) < 0)
return -EIO;
pkt->pts = curtime & ((1LL << 48) - 1);
if (dropped)
pkt->flags |= PKT_FLAG_DROPPED_FRAME;