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ws_snd: remove the 2-bit ADPCM table and just subtract 2 instead.

This commit is contained in:
Justin Ruggles 2011-09-12 10:22:31 -04:00
parent 618b067d21
commit 659c719bc7
1 changed files with 4 additions and 5 deletions
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9
libavcodec/ws-snd1.c
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@ -32,7 +32,6 @@
* http://www.multimedia.cx
*/
static const int8_t ws_adpcm_2bit[] = { -2, -1, 0, 1};
static const int8_t ws_adpcm_4bit[] = {
-9, -8, -6, -5, -4, -3, -2, -1,
0, 1, 2, 3, 4, 5, 6, 8 };
@ -117,16 +116,16 @@ static int ws_snd_decode_frame(AVCodecContext *avctx,
case 0: /* ADPCM 2-bit */
for (count++; count > 0; count--) {
code = *buf++;
sample += ws_adpcm_2bit[code & 0x3];
sample += ( code & 0x3) - 2;
sample = av_clip_uint8(sample);
*samples++ = sample;
sample += ws_adpcm_2bit[(code >> 2) & 0x3];
sample += ((code >> 2) & 0x3) - 2;
sample = av_clip_uint8(sample);
*samples++ = sample;
sample += ws_adpcm_2bit[(code >> 4) & 0x3];
sample += ((code >> 4) & 0x3) - 2;
sample = av_clip_uint8(sample);
*samples++ = sample;
sample += ws_adpcm_2bit[(code >> 6) & 0x3];
sample += (code >> 6) - 2;
sample = av_clip_uint8(sample);
*samples++ = sample;
}