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examples/encode_audio: use the AVFrame API for allocating the data 

It is simpler and more efficient.
This commit is contained in:
Anton Khirnov 2016-10-19 21:21:08 +02:00
parent c00a11ab38
commit f76698e759
1 changed files with 10 additions and 16 deletions
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26
doc/examples/encode_audio.c
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@ -97,7 +97,6 @@ int main(int argc, char **argv)
AVFrame *frame;
AVPacket pkt;
int i, j, k, ret, got_output;
int buffer_size;
FILE *f;
uint16_t *samples;
float t, tincr;
@ -159,21 +158,10 @@ int main(int argc, char **argv)
frame->format = c->sample_fmt;
frame->channel_layout = c->channel_layout;
/* the codec gives us the frame size, in samples,
* we calculate the size of the samples buffer in bytes */
buffer_size = av_samples_get_buffer_size(NULL, c->channels, c->frame_size,
c->sample_fmt, 0);
samples = av_malloc(buffer_size);
if (!samples) {
fprintf(stderr, "could not allocate %d bytes for samples buffer\n",
buffer_size);
exit(1);
}
/* setup the data pointers in the AVFrame */
ret = avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt,
(const uint8_t*)samples, buffer_size, 0);
/* allocate the data buffers */
ret = av_frame_get_buffer(frame, 0);
if (ret < 0) {
fprintf(stderr, "could not setup audio frame\n");
fprintf(stderr, "could not allocate audio data buffers\n");
exit(1);
}
@ -185,6 +173,13 @@ int main(int argc, char **argv)
pkt.data = NULL; // packet data will be allocated by the encoder
pkt.size = 0;
/* make sure the frame is writable -- makes a copy if the encoder
* kept a reference internally */
ret = av_frame_make_writable(frame);
if (ret < 0)
exit(1);
samples = (uint16_t*)frame->data[0];
for (j = 0; j < c->frame_size; j++) {
samples[2*j] = (int)(sin(t) * 10000);
@ -205,7 +200,6 @@ int main(int argc, char **argv)
}
fclose(f);
av_freep(&samples);
av_frame_free(&frame);
avcodec_free_context(&c);
}