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-rw-r--r--libswresample/rematrix.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/libswresample/rematrix.c b/libswresample/rematrix.c
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--- /dev/null
+++ b/libswresample/rematrix.c
@@ -0,0 +1,280 @@
+/*
+ * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
+ *
+ * This file is part of libswresample
+ *
+ * libswresample is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * libswresample is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with libswresample; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "swresample_internal.h"
+#include "libavutil/audioconvert.h"
+#include "libavutil/avassert.h"
+
+#define ONE (1.0)
+#define R(x) x
+#define SAMPLE float
+#define RENAME(x) x ## _float
+#include "rematrix_template.c"
+#undef SAMPLE
+#undef RENAME
+#undef R
+#undef ONE
+
+#define ONE (-32768)
+#define R(x) (((x) + 16384)>>15)
+#define SAMPLE int16_t
+#define RENAME(x) x ## _s16
+#include "rematrix_template.c"
+
+
+#define FRONT_LEFT 0
+#define FRONT_RIGHT 1
+#define FRONT_CENTER 2
+#define LOW_FREQUENCY 3
+#define BACK_LEFT 4
+#define BACK_RIGHT 5
+#define FRONT_LEFT_OF_CENTER 6
+#define FRONT_RIGHT_OF_CENTER 7
+#define BACK_CENTER 8
+#define SIDE_LEFT 9
+#define SIDE_RIGHT 10
+#define TOP_CENTER 11
+#define TOP_FRONT_LEFT 12
+#define TOP_FRONT_CENTER 13
+#define TOP_FRONT_RIGHT 14
+#define TOP_BACK_LEFT 15
+#define TOP_BACK_CENTER 16
+#define TOP_BACK_RIGHT 17
+
+static int even(int64_t layout){
+ if(!layout) return 1;
+ if(layout&(layout-1)) return 1;
+ return 0;
+}
+
+static int sane_layout(int64_t layout){
+ if(!(layout & AV_CH_LAYOUT_SURROUND)) // at least 1 front speaker
+ return 0;
+ if(!even(layout & (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT))) // no asymetric front
+ return 0;
+ if(!even(layout & (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT))) // no asymetric side
+ return 0;
+ if(!even(layout & (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)))
+ return 0;
+ if(!even(layout & (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)))
+ return 0;
+ if(av_get_channel_layout_nb_channels(layout) >= SWR_CH_MAX)
+ return 0;
+
+ return 1;
+}
+
+int swr_rematrix_init(SwrContext *s){
+ int i, j, out_i;
+ double matrix[64][64]={{0}};
+ int64_t unaccounted= s->in_ch_layout & ~s->out_ch_layout;
+ double maxcoef=0;
+
+ for(i=0; i<64; i++){
+ if(s->in_ch_layout & s->out_ch_layout & (1LL<<i))
+ matrix[i][i]= 1.0;
+ }
+
+ if(!sane_layout(s->in_ch_layout)){
+ av_log(s, AV_LOG_ERROR, "Input channel layout isnt supported\n");
+ return AVERROR(EINVAL);
+ }
+ if(!sane_layout(s->out_ch_layout)){
+ av_log(s, AV_LOG_ERROR, "Output channel layout isnt supported\n");
+ return AVERROR(EINVAL);
+ }
+
+//FIXME implement dolby surround
+//FIXME implement full ac3
+
+
+ if(unaccounted & AV_CH_FRONT_CENTER){
+ if((s->out_ch_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO){
+ matrix[ FRONT_LEFT][FRONT_CENTER]+= M_SQRT1_2;
+ matrix[FRONT_RIGHT][FRONT_CENTER]+= M_SQRT1_2;
+ }else
+ av_assert0(0);
+ }
+ if(unaccounted & AV_CH_LAYOUT_STEREO){
+ if(s->out_ch_layout & AV_CH_FRONT_CENTER){
+ matrix[FRONT_CENTER][ FRONT_LEFT]+= M_SQRT1_2;
+ matrix[FRONT_CENTER][FRONT_RIGHT]+= M_SQRT1_2;
+ if(s->in_ch_layout & AV_CH_FRONT_CENTER)
+ matrix[FRONT_CENTER][ FRONT_CENTER] = s->clev*sqrt(2);
+ }else
+ av_assert0(0);
+ }
+
+ if(unaccounted & AV_CH_BACK_CENTER){
+ if(s->out_ch_layout & AV_CH_BACK_LEFT){
+ matrix[ BACK_LEFT][BACK_CENTER]+= M_SQRT1_2;
+ matrix[BACK_RIGHT][BACK_CENTER]+= M_SQRT1_2;
+ }else if(s->out_ch_layout & AV_CH_SIDE_LEFT){
+ matrix[ SIDE_LEFT][BACK_CENTER]+= M_SQRT1_2;
+ matrix[SIDE_RIGHT][BACK_CENTER]+= M_SQRT1_2;
+ }else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
+ matrix[ FRONT_LEFT][BACK_CENTER]+= s->slev*M_SQRT1_2;
+ matrix[FRONT_RIGHT][BACK_CENTER]+= s->slev*M_SQRT1_2;
+ }else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
+ matrix[ FRONT_CENTER][BACK_CENTER]+= s->slev*M_SQRT1_2;
+ }else
+ av_assert0(0);
+ }
+ if(unaccounted & AV_CH_BACK_LEFT){
+ if(s->out_ch_layout & AV_CH_BACK_CENTER){
+ matrix[BACK_CENTER][ BACK_LEFT]+= M_SQRT1_2;
+ matrix[BACK_CENTER][BACK_RIGHT]+= M_SQRT1_2;
+ }else if(s->out_ch_layout & AV_CH_SIDE_LEFT){
+ if(s->in_ch_layout & AV_CH_SIDE_LEFT){
+ matrix[ SIDE_LEFT][ BACK_LEFT]+= M_SQRT1_2;
+ matrix[SIDE_RIGHT][BACK_RIGHT]+= M_SQRT1_2;
+ }else{
+ matrix[ SIDE_LEFT][ BACK_LEFT]+= 1.0;
+ matrix[SIDE_RIGHT][BACK_RIGHT]+= 1.0;
+ }
+ }else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
+ matrix[ FRONT_LEFT][ BACK_LEFT]+= s->slev;
+ matrix[FRONT_RIGHT][BACK_RIGHT]+= s->slev;
+ }else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
+ matrix[ FRONT_CENTER][BACK_LEFT ]+= s->slev*M_SQRT1_2;
+ matrix[ FRONT_CENTER][BACK_RIGHT]+= s->slev*M_SQRT1_2;
+ }else
+ av_assert0(0);
+ }
+
+ if(unaccounted & AV_CH_SIDE_LEFT){
+ if(s->out_ch_layout & AV_CH_BACK_LEFT){
+ matrix[ BACK_LEFT][ SIDE_LEFT]+= 1.0;
+ matrix[BACK_RIGHT][SIDE_RIGHT]+= 1.0;
+ }else if(s->out_ch_layout & AV_CH_BACK_CENTER){
+ matrix[BACK_CENTER][ SIDE_LEFT]+= M_SQRT1_2;
+ matrix[BACK_CENTER][SIDE_RIGHT]+= M_SQRT1_2;
+ }else if(s->out_ch_layout & AV_CH_FRONT_LEFT){
+ matrix[ FRONT_LEFT][ SIDE_LEFT]+= s->slev;
+ matrix[FRONT_RIGHT][SIDE_RIGHT]+= s->slev;
+ }else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
+ matrix[ FRONT_CENTER][SIDE_LEFT ]+= s->slev*M_SQRT1_2;
+ matrix[ FRONT_CENTER][SIDE_RIGHT]+= s->slev*M_SQRT1_2;
+ }else
+ av_assert0(0);
+ }
+
+ if(unaccounted & AV_CH_FRONT_LEFT_OF_CENTER){
+ if(s->out_ch_layout & AV_CH_FRONT_LEFT){
+ matrix[ FRONT_LEFT][ FRONT_LEFT_OF_CENTER]+= 1.0;
+ matrix[FRONT_RIGHT][FRONT_RIGHT_OF_CENTER]+= 1.0;
+ }else if(s->out_ch_layout & AV_CH_FRONT_CENTER){
+ matrix[ FRONT_CENTER][ FRONT_LEFT_OF_CENTER]+= M_SQRT1_2;
+ matrix[ FRONT_CENTER][FRONT_RIGHT_OF_CENTER]+= M_SQRT1_2;
+ }else
+ av_assert0(0);
+ }
+
+ //FIXME quantize for integeres
+ for(out_i=i=0; i<64; i++){
+ double sum=0;
+ int in_i=0;
+ int ch_in=0;
+ for(j=0; j<64; j++){
+ s->matrix[out_i][in_i]= matrix[i][j];
+ s->matrix16[out_i][in_i]= lrintf(matrix[i][j] * 32768);
+ if(matrix[i][j]){
+ s->matrix_ch[out_i][++ch_in]= in_i;
+ sum += fabs(matrix[i][j]);
+ }
+ if(s->in_ch_layout & (1ULL<<j))
+ in_i++;
+ }
+ s->matrix_ch[out_i][0]= ch_in;
+ maxcoef= FFMAX(maxcoef, sum);
+ if(s->out_ch_layout & (1ULL<<i))
+ out_i++;
+ }
+ if(( s->out_sample_fmt < AV_SAMPLE_FMT_FLT
+ || s->int_sample_fmt < AV_SAMPLE_FMT_FLT) && maxcoef > 1.0){
+ for(i=0; i<SWR_CH_MAX; i++)
+ for(j=0; j<SWR_CH_MAX; j++){
+ s->matrix[i][j] /= maxcoef;
+ s->matrix16[i][j]= lrintf(s->matrix[i][j] * 32768);
+ }
+ }
+ for(i=0; i<av_get_channel_layout_nb_channels(s->out_ch_layout); i++){
+ for(j=0; j<av_get_channel_layout_nb_channels(s->in_ch_layout); j++){
+ av_log(NULL, AV_LOG_DEBUG, "%f ", s->matrix[i][j]);
+ }
+ av_log(NULL, AV_LOG_DEBUG, "\n");
+ }
+ return 0;
+}
+
+int swr_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy){
+ int out_i, in_i, i, j;
+
+ av_assert0(out->ch_count == av_get_channel_layout_nb_channels(s->out_ch_layout));
+ av_assert0(in ->ch_count == av_get_channel_layout_nb_channels(s-> in_ch_layout));
+
+ for(out_i=0; out_i<out->ch_count; out_i++){
+ switch(s->matrix_ch[out_i][0]){
+ case 1:
+ in_i= s->matrix_ch[out_i][1];
+ if(mustcopy || s->matrix[out_i][in_i]!=1.0){
+ if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
+ copy_float(out->ch[out_i], in->ch[in_i], s->matrix[out_i][in_i], len);
+ }else
+ copy_s16 (out->ch[out_i], in->ch[in_i], s->matrix16[out_i][in_i], len);
+ }else{
+ out->ch[out_i]= in->ch[in_i];
+ }
+ break;
+ case 2:
+ if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
+ sum2_float(out->ch[out_i], in->ch[ s->matrix_ch[out_i][1] ], in->ch[ s->matrix_ch[out_i][2] ],
+ s->matrix[out_i][ s->matrix_ch[out_i][1] ], s->matrix[out_i][ s->matrix_ch[out_i][2] ],
+ len);
+ }else{
+ sum2_s16 (out->ch[out_i], in->ch[ s->matrix_ch[out_i][1] ], in->ch[ s->matrix_ch[out_i][2] ],
+ s->matrix16[out_i][ s->matrix_ch[out_i][1] ], s->matrix16[out_i][ s->matrix_ch[out_i][2] ],
+ len);
+ }
+ break;
+ default:
+ if(s->int_sample_fmt == AV_SAMPLE_FMT_FLT){
+ for(i=0; i<len; i++){
+ float v=0;
+ for(j=0; j<s->matrix_ch[out_i][0]; j++){
+ in_i= s->matrix_ch[out_i][1+j];
+ v+= ((float*)in->ch[in_i])[i] * s->matrix[out_i][in_i];
+ }
+ ((float*)out->ch[out_i])[i]= v;
+ }
+ }else{
+ for(i=0; i<len; i++){
+ int v=0;
+ for(j=0; j<s->matrix_ch[out_i][0]; j++){
+ in_i= s->matrix_ch[out_i][1+j];
+ v+= ((int16_t*)in->ch[in_i])[i] * s->matrix16[out_i][in_i];
+ }
+ ((int16_t*)out->ch[out_i])[i]= (v + 16384)>>15;
+ }
+ }
+ }
+ }
+ return 0;
+}
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