generic-library/ffmpeg
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output example: allocate the audio frame only once

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This commit is contained in:
Anton Khirnov 2014-06-24 09:02:25 +02:00
parent edd5f95764
commit 63fd0d866c
1 changed files with 23 additions and 26 deletions
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49
doc/examples/output.c
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@ -55,7 +55,6 @@ typedef struct OutputStream {
AVFrame *tmp_frame;
float t, tincr, tincr2;
int audio_input_frame_size;
} OutputStream;
/**************************************************************/
@ -100,6 +99,7 @@ static void add_audio_stream(OutputStream *ost, AVFormatContext *oc,
static void open_audio(AVFormatContext *oc, OutputStream *ost)
{
AVCodecContext *c;
int ret;
c = ost->st->codec;
@ -115,10 +115,24 @@ static void open_audio(AVFormatContext *oc, OutputStream *ost)
/* increment frequency by 110 Hz per second */
ost->tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
ost->frame = av_frame_alloc();
if (!ost->frame)
exit(1);
ost->frame->sample_rate = c->sample_rate;
ost->frame->format = AV_SAMPLE_FMT_S16;
ost->frame->channel_layout = c->channel_layout;
if (c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)
ost->audio_input_frame_size = 10000;
ost->frame->nb_samples = 10000;
else
ost->audio_input_frame_size = c->frame_size;
ost->frame->nb_samples = c->frame_size;
ret = av_frame_get_buffer(ost->frame, 0);
if (ret < 0) {
fprintf(stderr, "Could not allocate an audio frame.\n");
exit(1);
}
}
/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
@ -149,25 +163,14 @@ static void write_audio_frame(AVFormatContext *oc, OutputStream *ost)
{
AVCodecContext *c;
AVPacket pkt = { 0 }; // data and size must be 0;
AVFrame *frame = av_frame_alloc();
int got_packet, ret;
av_init_packet(&pkt);
c = ost->st->codec;
frame->sample_rate = c->sample_rate;
frame->nb_samples = ost->audio_input_frame_size;
frame->format = AV_SAMPLE_FMT_S16;
frame->channel_layout = c->channel_layout;
ret = av_frame_get_buffer(frame, 0);
if (ret < 0) {
fprintf(stderr, "Could not allocate an audio frame.\n");
exit(1);
}
get_audio_frame(ost, ost->frame, c->channels);
get_audio_frame(ost, frame, c->channels);
avcodec_encode_audio2(c, &pkt, frame, &got_packet);
avcodec_encode_audio2(c, &pkt, ost->frame, &got_packet);
if (!got_packet)
return;
@ -178,12 +181,6 @@ static void write_audio_frame(AVFormatContext *oc, OutputStream *ost)
fprintf(stderr, "Error while writing audio frame\n");
exit(1);
}
av_frame_free(&frame);
}
static void close_audio(AVFormatContext *oc, OutputStream *ost)
{
avcodec_close(ost->st->codec);
}
/**************************************************************/
@ -399,7 +396,7 @@ static void write_video_frame(AVFormatContext *oc, OutputStream *ost)
frame_count++;
}
static void close_video(AVFormatContext *oc, OutputStream *ost)
static void close_stream(AVFormatContext *oc, OutputStream *ost)
{
avcodec_close(ost->st->codec);
av_frame_free(&ost->frame);
@ -411,7 +408,7 @@ static void close_video(AVFormatContext *oc, OutputStream *ost)
int main(int argc, char **argv)
{
OutputStream video_st, audio_st;
OutputStream video_st = { 0 }, audio_st = { 0 };
const char *filename;
AVOutputFormat *fmt;
AVFormatContext *oc;
@ -517,9 +514,9 @@ int main(int argc, char **argv)
/* Close each codec. */
if (have_video)
close_video(oc, &video_st);
close_stream(oc, &video_st);
if (have_audio)
close_audio(oc, &audio_st);
close_stream(oc, &audio_st);
/* Free the streams. */
for (i = 0; i < oc->nb_streams; i++) {