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Optimize vorbis_residue_decode() so that vr->type is a constant.

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Based on a patch by Siarhei Siamashka.

Originally committed as revision 15134 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-08-31 22:49:42 +00:00
parent 969c163f1f
commit c541e668f6
1 changed files with 20 additions and 9 deletions
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29
libavcodec/vorbis_dec.c
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@ -1224,7 +1224,7 @@ static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *
// Read and decode residue
static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) {
static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen, int vr_type) {
GetBitContext *gb=&vc->gb;
uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
uint_fast16_t n_to_read=vr->end-vr->begin;
@ -1235,7 +1235,7 @@ static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fa
uint_fast8_t i,j,l;
uint_fast16_t k;
if (vr->type==2) {
if (vr_type==2) {
for(j=1;j<ch;++j) {
do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input
}
@ -1292,7 +1292,7 @@ static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fa
: FASTDIV(vr->partition_size, dim);
vorbis_codebook codebook= vc->codebooks[vqbook];
if (vr->type==0) {
if (vr_type==0) {
voffs=voffset+j*vlen;
for(k=0;k<step;++k) {
@ -1302,7 +1302,7 @@ static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fa
}
}
}
else if (vr->type==1) {
else if (vr_type==1) {
voffs=voffset+j*vlen;
for(k=0;k<step;++k) {
coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
@ -1313,7 +1313,7 @@ static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fa
}
}
}
else if (vr->type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
voffs=voffset>>1;
if(dim==2) {
@ -1342,7 +1342,7 @@ static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fa
}
}
else if (vr->type==2) {
else if (vr_type==2) {
voffs=voffset;
for(k=0;k<step;++k) {
@ -1353,9 +1353,6 @@ static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fa
AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);
}
}
} else {
av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
return 1;
}
}
}
@ -1369,6 +1366,20 @@ static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fa
return 0;
}
static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen)
{
if (vr->type==2)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
else if (vr->type==1)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
else if (vr->type==0)
return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
else {
av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
return 1;
}
}
void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
{
int i;