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authorAnton Khirnov <anton@khirnov.net>2016-10-19 21:56:22 +0200
committerAnton Khirnov <anton@khirnov.net>2016-11-23 13:09:41 +0100
commit0946c754d99c05413e813ee515039adcf0f9232a (patch)
treec6be3c6240dc4cf0905f281b84b4675e3d06d808
parentf27e262dbdea1991b22e08b639ac03e642a3482c (diff)
downloadffmpeg-0946c754d99c05413e813ee515039adcf0f9232a.tar.gz
examples/decode_audio: use a parser for splitting the input
Do not rely on the decoder handling this, as it's not guaranteed to work.
-rw-r--r--doc/examples/decode_audio.c82
1 files changed, 54 insertions, 28 deletions
diff --git a/doc/examples/decode_audio.c b/doc/examples/decode_audio.c
index b56a5ee7f2..d2150a67c1 100644
--- a/doc/examples/decode_audio.c
+++ b/doc/examples/decode_audio.c
@@ -37,14 +37,40 @@
#define AUDIO_INBUF_SIZE 20480
#define AUDIO_REFILL_THRESH 4096
+static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame,
+ FILE *outfile)
+{
+ int len, got_frame;
+
+ while (pkt->size > 0) {
+ len = avcodec_decode_audio4(dec_ctx, frame, &got_frame, pkt);
+ if (len < 0) {
+ fprintf(stderr, "Error while decoding\n");
+ exit(1);
+ }
+ if (got_frame) {
+ /* if a frame has been decoded, output it */
+ int data_size = av_samples_get_buffer_size(NULL, dec_ctx->channels,
+ frame->nb_samples,
+ dec_ctx->sample_fmt, 1);
+ fwrite(frame->data[0], 1, data_size, outfile);
+ }
+ pkt->size -= len;
+ pkt->data += len;
+ }
+}
+
int main(int argc, char **argv)
{
const char *outfilename, *filename;
const AVCodec *codec;
AVCodecContext *c= NULL;
- int len;
+ AVCodecParserContext *parser = NULL;
+ int len, ret;
FILE *f, *outfile;
uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
+ uint8_t *data;
+ size_t data_size;
AVPacket avpkt;
AVFrame *decoded_frame = NULL;
@@ -67,6 +93,12 @@ int main(int argc, char **argv)
exit(1);
}
+ parser = av_parser_init(codec->id);
+ if (!parser) {
+ fprintf(stderr, "parser not found\n");
+ exit(1);
+ }
+
c = avcodec_alloc_context3(codec);
/* open it */
@@ -87,12 +119,10 @@ int main(int argc, char **argv)
}
/* decode until eof */
- avpkt.data = inbuf;
- avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
-
- while (avpkt.size > 0) {
- int got_frame = 0;
+ data = inbuf;
+ data_size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
+ while (data_size > 0) {
if (!decoded_frame) {
if (!(decoded_frame = av_frame_alloc())) {
fprintf(stderr, "out of memory\n");
@@ -100,31 +130,26 @@ int main(int argc, char **argv)
}
}
- len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt);
- if (len < 0) {
- fprintf(stderr, "Error while decoding\n");
+ ret = av_parser_parse2(parser, c, &avpkt.data, &avpkt.size,
+ data, data_size,
+ AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Error while parsing\n");
exit(1);
}
- if (got_frame) {
- /* if a frame has been decoded, output it */
- int data_size = av_samples_get_buffer_size(NULL, c->channels,
- decoded_frame->nb_samples,
- c->sample_fmt, 1);
- fwrite(decoded_frame->data[0], 1, data_size, outfile);
- }
- avpkt.size -= len;
- avpkt.data += len;
- if (avpkt.size < AUDIO_REFILL_THRESH) {
- /* Refill the input buffer, to avoid trying to decode
- * incomplete frames. Instead of this, one could also use
- * a parser, or use a proper container format through
- * libavformat. */
- memmove(inbuf, avpkt.data, avpkt.size);
- avpkt.data = inbuf;
- len = fread(avpkt.data + avpkt.size, 1,
- AUDIO_INBUF_SIZE - avpkt.size, f);
+ data += ret;
+ data_size -= ret;
+
+ if (avpkt.size)
+ decode(c, &avpkt, decoded_frame, outfile);
+
+ if (data_size < AUDIO_REFILL_THRESH) {
+ memmove(inbuf, data, data_size);
+ data = inbuf;
+ len = fread(data + data_size, 1,
+ AUDIO_INBUF_SIZE - data_size, f);
if (len > 0)
- avpkt.size += len;
+ data_size += len;
}
}
@@ -132,6 +157,7 @@ int main(int argc, char **argv)
fclose(f);
avcodec_free_context(&c);
+ av_parser_close(parser);
av_frame_free(&decoded_frame);
return 0;