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Code Issues Releases Activity

adpcm: convert adpcm_ms to bytestream2.

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This commit is contained in:
Ronald S. Bultje 2012-03-17 13:04:12 -07:00
parent 89f3aa8ce2
commit 5353ee3c30
1 changed files with 24 additions and 16 deletions
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40
libavcodec/adpcm.c
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@ -194,12 +194,12 @@ static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble,
return c->predictor;
}
static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)
{
int predictor;
predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
predictor += ((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
c->sample2 = c->sample1;
c->sample1 = av_clip_int16(predictor);
@ -673,34 +673,42 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
{
int block_predictor;
if (avctx->block_align != 0 && buf_size > avctx->block_align)
buf_size = avctx->block_align;
block_predictor = av_clip(*src++, 0, 6);
block_predictor = bytestream2_get_byteu(&gb);
if (block_predictor > 6) {
av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[0] = %d\n",
block_predictor);
return AVERROR_INVALIDDATA;
}
c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
if (st) {
block_predictor = av_clip(*src++, 0, 6);
block_predictor = bytestream2_get_byteu(&gb);
if (block_predictor > 6) {
av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[1] = %d\n",
block_predictor);
return AVERROR_INVALIDDATA;
}
c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
}
c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
c->status[0].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);
if (st){
c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
c->status[1].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);
}
c->status[0].sample1 = bytestream_get_le16(&src);
if (st) c->status[1].sample1 = bytestream_get_le16(&src);
c->status[0].sample2 = bytestream_get_le16(&src);
if (st) c->status[1].sample2 = bytestream_get_le16(&src);
c->status[0].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
if (st) c->status[1].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
c->status[0].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
if (st) c->status[1].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
*samples++ = c->status[0].sample2;
if (st) *samples++ = c->status[1].sample2;
*samples++ = c->status[0].sample1;
if (st) *samples++ = c->status[1].sample1;
for(n = (nb_samples - 2) >> (1 - st); n > 0; n--, src++) {
*samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4 );
*samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
for(n = (nb_samples - 2) >> (1 - st); n > 0; n--) {
int byte = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ms_expand_nibble(&c->status[0 ], byte >> 4 );
*samples++ = adpcm_ms_expand_nibble(&c->status[st], byte & 0x0F);
}
break;
}