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Factorize usum 

Originally committed as revision 8960 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2007-05-09 23:08:01 +00:00
parent 13dec85765
commit 7d5aaa049c
1 changed files with 4 additions and 2 deletions
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6
libavcodec/pcm.c
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@ -169,12 +169,13 @@ static int pcm_encode_close(AVCodecContext *avctx)
*/
static inline void encode_from16(int bps, int le, int us,
short **samples, uint8_t **dst, int n) {
int usum = us ? 0x8000 : 0;
if (bps > 2)
memset(*dst, 0, n * bps);
if (le) *dst += bps - 2;
for(;n>0;n--) {
register int v = *(*samples)++;
if (us) v += 0x8000;
v += usum;
(*dst)[le] = v >> 8;
(*dst)[1 - le] = v;
*dst += bps;
@ -361,10 +362,11 @@ static int pcm_decode_init(AVCodecContext * avctx)
static inline void decode_to16(int bps, int le, int us,
uint8_t **src, short **samples, int src_len)
{
int usum = us ? -0x8000 : 0;
register int n = src_len / bps;
if (le) *src += bps - 2;
for(;n>0;n--) {
*(*samples)++ = ((*src)[le] << 8 | (*src)[1 - le]) - (us?0x8000:0);
*(*samples)++ = ((*src)[le] << 8 | (*src)[1 - le]) + usum;
*src += bps;
}
if (le) *src -= bps - 2;