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doc/examples/filtering_audio: fix chunked audio decoding 

Support the case when multiple frames are contained in a single packet.
In particular, fix fate-samples/lossless-audio/luckynight-partial.shn
sample decoding.
This commit is contained in:
Stefano Sabatini 2013-12-02 15:21:52 +01:00
parent 893f33e7f0
commit c490cd4c1a
1 changed files with 15 additions and 4 deletions
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19
doc/examples/filtering_audio.c
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@ -196,7 +196,7 @@ static void print_frame(const AVFrame *frame)
int main(int argc, char **argv)
{
int ret;
AVPacket packet;
AVPacket packet0, packet;
AVFrame *frame = av_frame_alloc();
AVFrame *filt_frame = av_frame_alloc();
int got_frame;
@ -220,9 +220,13 @@ int main(int argc, char **argv)
goto end;
/* read all packets */
packet.data = NULL;
while (1) {
if ((ret = av_read_frame(fmt_ctx, &packet)) < 0)
break;
if (!packet0.data) {
if ((ret = av_read_frame(fmt_ctx, &packet)) < 0)
break;
packet0 = packet;
}
if (packet.stream_index == audio_stream_index) {
avcodec_get_frame_defaults(frame);
@ -232,6 +236,8 @@ int main(int argc, char **argv)
av_log(NULL, AV_LOG_ERROR, "Error decoding audio\n");
continue;
}
packet.size -= ret;
packet.data += ret;
if (got_frame) {
/* push the audio data from decoded frame into the filtergraph */
@ -251,8 +257,13 @@ int main(int argc, char **argv)
av_frame_unref(filt_frame);
}
}
if (packet.size <= 0)
av_free_packet(&packet0);
} else {
/* discard non-wanted packets */
av_free_packet(&packet0);
}
av_free_packet(&packet);
}
end:
avfilter_graph_free(&filter_graph);