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| author | Siarhei Siamashka <siarhei.siamashka@gmail.com> | 2008-10-01 07:28:34 +0000 |
|---|---|---|
| committer | Benoit Fouet <benoit.fouet@free.fr> | 2008-10-01 07:28:34 +0000 |
| commit | 9d2b5cf2e0add8f0af315c3d83851c4d8efe39d9 (patch) | |
| tree | 75ff399103d045f3032902f0030a5c8514e09413 /libavcodec/vorbis_dec.c | |
| parent | ba31df31d9170f808aec903a8f55da6bcd251c72 (diff) | |
Interleaved forward/backward channels processing in order to increase chances
of stepping on already cached data for the cores with extremely small data
cache.
Patch by Siarhei Siamashka: name dot surname at gmail
Originally committed as revision 15493 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vorbis_dec.c')
| -rw-r--r-- | libavcodec/vorbis_dec.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/libavcodec/vorbis_dec.c b/libavcodec/vorbis_dec.c index 7c975ffb01..9fc619b803 100644 --- a/libavcodec/vorbis_dec.c +++ b/libavcodec/vorbis_dec.c @@ -1426,7 +1426,7 @@ static int vorbis_parse_audio_packet(vorbis_context *vc) { uint_fast8_t mode_number; uint_fast8_t blockflag; uint_fast16_t blocksize; - int_fast32_t i,j,dir; + int_fast32_t i,j; uint_fast8_t no_residue[vc->audio_channels]; uint_fast8_t do_not_decode[vc->audio_channels]; vorbis_mapping *mapping; @@ -1518,29 +1518,27 @@ static int vorbis_parse_audio_packet(vorbis_context *vc) { vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2); } -// Dotproduct +// Dotproduct, MDCT - for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) { + for(j=vc->audio_channels-1;j>=0;j--) { + ch_floor_ptr=vc->channel_floors+j*blocksize/2; ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2; vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2); + ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr); } -// MDCT, overlap/add, save data for next overlapping FPMATH +// Overlap/add, save data for next overlapping FPMATH retlen = (blocksize + vc->blocksize[previous_window])/4; - dir = retlen <= blocksize/2; // pick an order so that ret[] can reuse floors[] without stepping on any data we need - for(j=dir?0:vc->audio_channels-1; (unsigned)j<vc->audio_channels; j+=dir*2-1) { + for(j=0;j<vc->audio_channels;j++) { uint_fast16_t bs0=vc->blocksize[0]; uint_fast16_t bs1=vc->blocksize[1]; float *residue=vc->channel_residues+res_chan[j]*blocksize/2; - float *floor=vc->channel_floors+j*blocksize/2; float *saved=vc->saved+j*bs1/4; float *ret=vc->channel_floors+j*retlen; float *buf=residue; const float *win=vc->win[blockflag&previous_window]; - ff_imdct_half(&vc->mdct[blockflag], buf, floor); - if(blockflag == previous_window) { vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4); } else if(blockflag > previous_window) { |