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SIMD vector optimizations. 3% faster overall decoding. 

Originally committed as revision 6026 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Benjamin Larsson 2006-08-19 08:46:52 +00:00
parent a1c69e0b50
commit 9aee40d967
1 changed files with 7 additions and 14 deletions
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21
libavcodec/wmadec.c
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@ -130,6 +130,7 @@ typedef struct WMADecodeContext {
float lsp_pow_e_table[256];
float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
DSPContext dsp;
#ifdef TRACE
int frame_count;
@ -228,6 +229,8 @@ static int wma_decode_init(AVCodecContext * avctx)
s->bit_rate = avctx->bit_rate;
s->block_align = avctx->block_align;
dsputil_init(&s->dsp, avctx);
if (avctx->codec->id == CODEC_ID_WMAV1) {
s->version = 1;
} else {
@ -1109,7 +1112,7 @@ static int wma_decode_block(WMADecodeContext *s)
if (s->channel_coded[ch]) {
DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]);
float *ptr;
int i, n4, index, n;
int n4, index, n;
n = s->block_len;
n4 = s->block_len / 2;
@ -1118,27 +1121,17 @@ static int wma_decode_block(WMADecodeContext *s)
/* XXX: optimize all that by build the window and
multipying/adding at the same time */
/* multiply by the window */
for(i=0;i<n * 2;i++) {
output[i] *= window[i];
}
/* add in the frame */
/* multiply by the window and add in the frame */
index = (s->frame_len / 2) + s->block_pos - n4;
ptr = &s->frame_out[ch][index];
for(i=0;i<n * 2;i++) {
*ptr += output[i];
ptr++;
}
s->dsp.vector_fmul_add_add(ptr,window,output,ptr,0,2*n,1);
/* specific fast case for ms-stereo : add to second
channel if it is not coded */
if (s->ms_stereo && !s->channel_coded[1]) {
ptr = &s->frame_out[1][index];
for(i=0;i<n * 2;i++) {
*ptr += output[i];
ptr++;
}
s->dsp.vector_fmul_add_add(ptr,window,output,ptr,0,2*n,1);
}
}
}