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api-example: Try to avoid decoding incomplete frames 

Use a larger input audio buffer, refill it when it has less than 4 KB data
left.

Originally committed as revision 23323 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Martin Storsjö 2010-05-25 19:13:28 +00:00
parent 0ecfa7b7c7
commit 11f6181af1
1 changed files with 16 additions and 7 deletions
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23
libavcodec/api-example.c
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@ -39,6 +39,8 @@
#include "libavutil/mathematics.h"
#define INBUF_SIZE 4096
#define AUDIO_INBUF_SIZE 20480
#define AUDIO_REFILL_THRESH 4096
/*
* Audio encoding example
@ -118,7 +120,7 @@ static void audio_decode_example(const char *outfilename, const char *filename)
int out_size, len;
FILE *f, *outfile;
uint8_t *outbuf;
uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
AVPacket avpkt;
av_init_packet(&avpkt);
@ -155,12 +157,8 @@ static void audio_decode_example(const char *outfilename, const char *filename)
/* decode until eof */
avpkt.data = inbuf;
for(;;) {
avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
if (avpkt.size == 0)
break;
avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
avpkt.data = inbuf;
while (avpkt.size > 0) {
out_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
len = avcodec_decode_audio3(c, (short *)outbuf, &out_size, &avpkt);
@ -174,8 +172,19 @@ static void audio_decode_example(const char *outfilename, const char *filename)
}
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);
if (len > 0)
avpkt.size += len;
}
}
}
fclose(outfile);
fclose(f);