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examples/output: convert to codecpar

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pull/200/head
Anton Khirnov 9 years ago
parent c23152a903
commit 9897d9f4e0
1 changed files with 43 additions and 17 deletions
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  1. 60
      doc/examples/output.c

60
doc/examples/output.c
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@ -52,6 +52,7 @@
// a wrapper around a single output AVStream
typedef struct OutputStream {
AVStream *st;
AVCodecContext *enc;
/* pts of the next frame that will be generated */
int64_t next_pts;
@ -85,13 +86,18 @@ static void add_audio_stream(OutputStream *ost, AVFormatContext *oc,
exit(1);
}
ost->st = avformat_new_stream(oc, codec);
ost->st = avformat_new_stream(oc, NULL);
if (!ost->st) {
fprintf(stderr, "Could not alloc stream\n");
exit(1);
}
c = ost->st->codec;
c = avcodec_alloc_context3(codec);
if (!c) {
fprintf(stderr, "Could not alloc an encoding context\n");
exit(1);
}
ost->enc = c;
/* put sample parameters */
c->sample_fmt = codec->sample_fmts ? codec->sample_fmts[0] : AV_SAMPLE_FMT_S16;
@ -162,9 +168,9 @@ static AVFrame *alloc_audio_frame(enum AVSampleFormat sample_fmt,
static void open_audio(AVFormatContext *oc, OutputStream *ost)
{
AVCodecContext *c;
int nb_samples;
int nb_samples, ret;
c = ost->st->codec;
c = ost->enc;
/* open it */
if (avcodec_open2(c, NULL, NULL) < 0) {
@ -187,6 +193,13 @@ static void open_audio(AVFormatContext *oc, OutputStream *ost)
c->sample_rate, nb_samples);
ost->tmp_frame = alloc_audio_frame(AV_SAMPLE_FMT_S16, AV_CH_LAYOUT_STEREO,
44100, nb_samples);
/* copy the stream parameters to the muxer */
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
if (ret < 0) {
fprintf(stderr, "Could not copy the stream parameters\n");
exit(1);
}
}
/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
@ -198,14 +211,14 @@ static AVFrame *get_audio_frame(OutputStream *ost)
int16_t *q = (int16_t*)frame->data[0];
/* check if we want to generate more frames */
if (av_compare_ts(ost->next_pts, ost->st->codec->time_base,
if (av_compare_ts(ost->next_pts, ost->enc->time_base,
STREAM_DURATION, (AVRational){ 1, 1 }) >= 0)
return NULL;
for (j = 0; j < frame->nb_samples; j++) {
v = (int)(sin(ost->t) * 10000);
for (i = 0; i < ost->st->codec->channels; i++)
for (i = 0; i < ost->enc->channels; i++)
*q++ = v;
ost->t += ost->tincr;
ost->tincr += ost->tincr2;
@ -224,12 +237,12 @@ static int encode_audio_frame(AVFormatContext *oc, OutputStream *ost,
int got_packet;
av_init_packet(&pkt);
avcodec_encode_audio2(ost->st->codec, &pkt, frame, &got_packet);
avcodec_encode_audio2(ost->enc, &pkt, frame, &got_packet);
if (got_packet) {
pkt.stream_index = ost->st->index;
av_packet_rescale_ts(&pkt, ost->st->codec->time_base, ost->st->time_base);
av_packet_rescale_ts(&pkt, ost->enc->time_base, ost->st->time_base);
/* Write the compressed frame to the media file. */
if (av_interleaved_write_frame(oc, &pkt) != 0) {
@ -324,13 +337,18 @@ static void add_video_stream(OutputStream *ost, AVFormatContext *oc,
exit(1);
}
ost->st = avformat_new_stream(oc, codec);
ost->st = avformat_new_stream(oc, NULL);
if (!ost->st) {
fprintf(stderr, "Could not alloc stream\n");
exit(1);
}
c = ost->st->codec;
c = avcodec_alloc_context3(codec);
if (!c) {
fprintf(stderr, "Could not alloc an encoding context\n");
exit(1);
}
ost->enc = c;
/* Put sample parameters. */
c->bit_rate = 400000;
@ -387,8 +405,9 @@ static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
static void open_video(AVFormatContext *oc, OutputStream *ost)
{
AVCodecContext *c;
int ret;
c = ost->st->codec;
c = ost->enc;
/* open the codec */
if (avcodec_open2(c, NULL, NULL) < 0) {
@ -414,6 +433,13 @@ static void open_video(AVFormatContext *oc, OutputStream *ost)
exit(1);
}
}
/* copy the stream parameters to the muxer */
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
if (ret < 0) {
fprintf(stderr, "Could not copy the stream parameters\n");
exit(1);
}
}
/* Prepare a dummy image. */
@ -448,10 +474,10 @@ static void fill_yuv_image(AVFrame *pict, int frame_index,
static AVFrame *get_video_frame(OutputStream *ost)
{
AVCodecContext *c = ost->st->codec;
AVCodecContext *c = ost->enc;
/* check if we want to generate more frames */
if (av_compare_ts(ost->next_pts, ost->st->codec->time_base,
if (av_compare_ts(ost->next_pts, c->time_base,
STREAM_DURATION, (AVRational){ 1, 1 }) >= 0)
return NULL;
@ -494,7 +520,7 @@ static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
AVPacket pkt = { 0 };
int got_packet = 0;
c = ost->st->codec;
c = ost->enc;
frame = get_video_frame(ost);
@ -525,7 +551,7 @@ static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
static void close_stream(AVFormatContext *oc, OutputStream *ost)
{
avcodec_close(ost->st->codec);
avcodec_free_context(&ost->enc);
av_frame_free(&ost->frame);
av_frame_free(&ost->tmp_frame);
sws_freeContext(ost->sws_ctx);
@ -614,8 +640,8 @@ int main(int argc, char **argv)
while (encode_video || encode_audio) {
/* select the stream to encode */
if (encode_video &&
(!encode_audio || av_compare_ts(video_st.next_pts, video_st.st->codec->time_base,
audio_st.next_pts, audio_st.st->codec->time_base) <= 0)) {
(!encode_audio || av_compare_ts(video_st.next_pts, video_st.enc->time_base,
audio_st.next_pts, audio_st.enc->time_base) <= 0)) {
encode_video = !write_video_frame(oc, &video_st);
} else {
encode_audio = !process_audio_stream(oc, &audio_st);

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