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cleanup and simplify adx_decode_header() 

Originally committed as revision 10900 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2007-11-01 17:58:03 +00:00
parent 6177c7efe1
commit c4cc361099
1 changed files with 6 additions and 23 deletions
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29
libavcodec/adx.c
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@ -249,35 +249,18 @@ static int adx_encode_frame(AVCodecContext *avctx,
#endif //CONFIG_ENCODERS
static int is_adx(const unsigned char *buf,size_t bufsize)
/* return data offset or 0 */
static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
{
int offset;
int offset;
if (buf[0]!=0x80) return 0;
offset = (AV_RB32(buf)^0x80000000)+4;
if (bufsize<offset || memcmp(buf+offset-6,"(c)CRI",6)) return 0;
return offset;
}
/* return data offset or 6 */
static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
{
int offset;
int channels,freq,size;
offset = is_adx(buf,bufsize);
if (offset==0) return 0;
channels = buf[7];
freq = AV_RB32(buf+8);
size = AV_RB32(buf+12);
// printf("freq=%d ch=%d\n",freq,channels);
avctx->sample_rate = freq;
avctx->channels = channels;
avctx->bit_rate = freq*channels*18*8/32;
// avctx->frame_size = 18*channels;
avctx->channels = buf[7];
avctx->sample_rate = AV_RB32(buf+8);
avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
return offset;
}