[FFmpeg-cvslog] examples/encode_audio: switch to the new audio encoding API
Anton Khirnov
git at videolan.org
Mon Apr 3 22:14:31 EEST 2017
ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Wed Oct 19 21:33:52 2016 +0200| [f27e262dbdea1991b22e08b639ac03e642a3482c] | committer: Anton Khirnov
examples/encode_audio: switch to the new audio encoding API
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f27e262dbdea1991b22e08b639ac03e642a3482c
---
doc/examples/encode_audio.c | 59 +++++++++++++++++++++++++++++++++------------
1 file changed, 43 insertions(+), 16 deletions(-)
diff --git a/doc/examples/encode_audio.c b/doc/examples/encode_audio.c
index db2440f..a32fcc9 100644
--- a/doc/examples/encode_audio.c
+++ b/doc/examples/encode_audio.c
@@ -89,14 +89,42 @@ static int select_channel_layout(const AVCodec *codec)
return best_ch_layout;
}
+static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt,
+ FILE *output)
+{
+ int ret;
+
+ /* send the frame for encoding */
+ ret = avcodec_send_frame(ctx, frame);
+ if (ret < 0) {
+ fprintf(stderr, "error sending the frame to the encoder\n");
+ exit(1);
+ }
+
+ /* read all the available output packets (in general there may be any
+ * number of them */
+ while (ret >= 0) {
+ ret = avcodec_receive_packet(ctx, pkt);
+ if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+ return;
+ else if (ret < 0) {
+ fprintf(stderr, "error encoding audio frame\n");
+ exit(1);
+ }
+
+ fwrite(pkt->data, 1, pkt->size, output);
+ av_packet_unref(pkt);
+ }
+}
+
int main(int argc, char **argv)
{
const char *filename;
const AVCodec *codec;
AVCodecContext *c= NULL;
AVFrame *frame;
- AVPacket pkt;
- int i, j, k, ret, got_output;
+ AVPacket *pkt;
+ int i, j, k, ret;
FILE *f;
uint16_t *samples;
float t, tincr;
@@ -147,6 +175,13 @@ int main(int argc, char **argv)
exit(1);
}
+ /* packet for holding encoded output */
+ pkt = av_packet_alloc();
+ if (!pkt) {
+ fprintf(stderr, "could not allocate the packet\n");
+ exit(1);
+ }
+
/* frame containing input raw audio */
frame = av_frame_alloc();
if (!frame) {
@@ -169,10 +204,6 @@ int main(int argc, char **argv)
t = 0;
tincr = 2 * M_PI * 440.0 / c->sample_rate;
for(i=0;i<200;i++) {
- av_init_packet(&pkt);
- 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);
@@ -187,19 +218,15 @@ int main(int argc, char **argv)
samples[2*j + k] = samples[2*j];
t += tincr;
}
- /* encode the samples */
- ret = avcodec_encode_audio2(c, &pkt, frame, &got_output);
- if (ret < 0) {
- fprintf(stderr, "error encoding audio frame\n");
- exit(1);
- }
- if (got_output) {
- fwrite(pkt.data, 1, pkt.size, f);
- av_packet_unref(&pkt);
- }
+ encode(c, frame, pkt, f);
}
+
+ /* flush the encoder */
+ encode(c, NULL, pkt, f);
+
fclose(f);
av_frame_free(&frame);
+ av_packet_free(&pkt);
avcodec_free_context(&c);
}
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