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Code Issues Releases Activity

examples/muxing: flush encoders at the end

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This commit is contained in:
Stefano Sabatini 2014-01-19 18:31:49 +01:00
parent 0269b30fef
commit c92d2f98db
1 changed files with 30 additions and 23 deletions
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53
doc/examples/muxing.c
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@ -41,9 +41,10 @@
#include <libswscale/swscale.h>
#include <libswresample/swresample.h>
static int audio_is_eof, video_is_eof;
#define STREAM_DURATION 10.0
#define STREAM_FRAME_RATE 25 /* 25 images/s */
#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
static int sws_flags = SWS_BICUBIC;
@ -254,7 +255,7 @@ static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
}
}
static void write_audio_frame(AVFormatContext *oc, AVStream *st)
static void write_audio_frame(AVFormatContext *oc, AVStream *st, int flush)
{
AVCodecContext *c;
AVPacket pkt = { 0 }; // data and size must be 0;
@ -263,6 +264,7 @@ static void write_audio_frame(AVFormatContext *oc, AVStream *st)
av_init_packet(&pkt);
c = st->codec;
if (!flush) {
get_audio_frame((int16_t *)src_samples_data[0], src_nb_samples, c->channels);
/* convert samples from native format to destination codec format, using the resampler */
@ -298,15 +300,19 @@ static void write_audio_frame(AVFormatContext *oc, AVStream *st)
avcodec_fill_audio_frame(audio_frame, c->channels, c->sample_fmt,
dst_samples_data[0], dst_samples_size, 0);
samples_count += dst_nb_samples;
}
ret = avcodec_encode_audio2(c, &pkt, audio_frame, &got_packet);
ret = avcodec_encode_audio2(c, &pkt, flush ? NULL : audio_frame, &got_packet);
if (ret < 0) {
fprintf(stderr, "Error encoding audio frame: %s\n", av_err2str(ret));
exit(1);
}
if (!got_packet)
if (!got_packet) {
if (flush)
audio_is_eof = 1;
return;
}
ret = write_frame(oc, &c->time_base, st, &pkt);
if (ret < 0) {
@ -402,17 +408,13 @@ static void fill_yuv_image(AVPicture *pict, int frame_index,
}
}
static void write_video_frame(AVFormatContext *oc, AVStream *st)
static void write_video_frame(AVFormatContext *oc, AVStream *st, int flush)
{
int ret;
static struct SwsContext *sws_ctx;
AVCodecContext *c = st->codec;
if (frame_count >= STREAM_NB_FRAMES) {
/* No more frames to compress. The codec has a latency of a few
* frames if using B-frames, so we get the last frames by
* passing the same picture again. */
} else {
if (!flush) {
if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
/* as we only generate a YUV420P picture, we must convert it
* to the codec pixel format if needed */
@ -435,7 +437,7 @@ static void write_video_frame(AVFormatContext *oc, AVStream *st)
}
}
if (oc->oformat->flags & AVFMT_RAWPICTURE) {
if (oc->oformat->flags & AVFMT_RAWPICTURE && !flush) {
/* Raw video case - directly store the picture in the packet */
AVPacket pkt;
av_init_packet(&pkt);
@ -453,7 +455,7 @@ static void write_video_frame(AVFormatContext *oc, AVStream *st)
/* encode the image */
frame->pts = frame_count;
ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
ret = avcodec_encode_video2(c, &pkt, flush ? NULL : frame, &got_packet);
if (ret < 0) {
fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
exit(1);
@ -463,6 +465,8 @@ static void write_video_frame(AVFormatContext *oc, AVStream *st)
if (got_packet) {
ret = write_frame(oc, &c->time_base, st, &pkt);
} else {
if (flush)
video_is_eof = 1;
ret = 0;
}
}
@ -493,7 +497,7 @@ int main(int argc, char **argv)
AVStream *audio_st, *video_st;
AVCodec *audio_codec, *video_codec;
double audio_time, video_time;
int ret;
int flush, ret;
/* Initialize libavcodec, and register all codecs and formats. */
av_register_all();
@ -559,20 +563,23 @@ int main(int argc, char **argv)
return 1;
}
for (;;) {
flush = 0;
while ((video_st && !video_is_eof) || (audio_st && !audio_is_eof)) {
/* Compute current audio and video time. */
audio_time = audio_st ? audio_st->pts.val * av_q2d(audio_st->time_base) : 0.0;
video_time = video_st ? video_st->pts.val * av_q2d(video_st->time_base) : 0.0;
audio_time = (audio_st && !audio_is_eof) ? audio_st->pts.val * av_q2d(audio_st->time_base) : INFINITY;
video_time = (video_st && !video_is_eof) ? video_st->pts.val * av_q2d(video_st->time_base) : INFINITY;
if ((!audio_st || audio_time >= STREAM_DURATION) &&
(!video_st || video_time >= STREAM_DURATION))
break;
if (!flush &&
(!audio_st || audio_time >= STREAM_DURATION) &&
(!video_st || video_time >= STREAM_DURATION)) {
flush = 1;
}
/* write interleaved audio and video frames */
if (!video_st || (video_st && audio_st && audio_time < video_time)) {
write_audio_frame(oc, audio_st);
} else {
write_video_frame(oc, video_st);
if (audio_st && !audio_is_eof && audio_time <= video_time) {
write_audio_frame(oc, audio_st, flush);
} else if (video_st && !video_is_eof && video_time < audio_time) {
write_video_frame(oc, video_st, flush);
}
}