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vmdaudio: simplify buffer pointer and header size handling.

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Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Justin Ruggles 2011-02-23 13:11:07 -05:00 committed by Ronald S. Bultje
parent 7a4fb3fd93
commit 2d213695fc
1 changed files with 10 additions and 9 deletions
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19
libavcodec/vmdav.c
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@ -511,9 +511,6 @@ static int vmdaudio_decode_frame(AVCodecContext *avctx,
int block_type;
unsigned char *output_samples = (unsigned char *)data;
/* point to the start of the encoded data */
const unsigned char *p = buf + 16;
if (buf_size < 16) {
av_log(avctx, AV_LOG_WARNING, "skipping small junk packet\n");
*data_size = 0;
@ -525,29 +522,33 @@ static int vmdaudio_decode_frame(AVCodecContext *avctx,
av_log(avctx, AV_LOG_ERROR, "unknown block type: %d\n", block_type);
return AVERROR(EINVAL);
}
buf += 16;
buf_size -= 16;
if (block_type == BLOCK_TYPE_AUDIO) {
/* the chunk contains audio */
*data_size = vmdaudio_loadsound(s, output_samples, p, 0, buf_size - 16);
*data_size = vmdaudio_loadsound(s, output_samples, buf, 0, buf_size);
} else if (block_type == BLOCK_TYPE_INITIAL) {
/* initial chunk, may contain audio and silence */
uint32_t flags = AV_RB32(p);
uint32_t flags = AV_RB32(buf);
int raw_block_size = s->block_align *
(av_get_bits_per_sample_fmt(avctx->sample_fmt) / 8);
int silent_chunks = av_popcount(flags);
if(*data_size < (s->block_align*silent_chunks + buf_size - 20) * 2)
buf += 4;
buf_size -= 4;
if(*data_size < (s->block_align*silent_chunks + buf_size) * 2)
return -1;
*data_size = 0;
memset(output_samples, 0, raw_block_size * silent_chunks);
output_samples += raw_block_size * silent_chunks;
*data_size = raw_block_size * silent_chunks;
*data_size += vmdaudio_loadsound(s, output_samples, p + 4, 0, buf_size - 20);
*data_size += vmdaudio_loadsound(s, output_samples, buf, 0, buf_size);
} else if (block_type == BLOCK_TYPE_SILENCE) {
/* silent chunk */
*data_size = vmdaudio_loadsound(s, output_samples, p, 1, s->block_align);
*data_size = vmdaudio_loadsound(s, output_samples, buf, 1, s->block_align);
}
return buf_size;
return avpkt->size;
}