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Add Dolby/DPLII downmix support to libswresample

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Based on code by John Stebbins <jstebbins.hb@gmail.com>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
pull/28/head
Michael Niedermayer 13 years ago
parent 2dd2e42951
commit c5278cb84f
3 changed files with 50 additions and 6 deletions
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  1. 48
      libswresample/rematrix.c
  2. 4
      libswresample/swresample.c
  3. 4
      libswresample/swresample_internal.h

48
libswresample/rematrix.c
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@ -126,6 +126,7 @@ static int auto_matrix(SwrContext *s)
int64_t unaccounted= s->in_ch_layout & ~s->out_ch_layout;
double maxcoef=0;
char buf[128];
const int matrix_encoding = s->matrix_encoding;
memset(s->matrix, 0, sizeof(s->matrix));
for(i=0; i<64; i++){
@ -178,8 +179,19 @@ static int auto_matrix(SwrContext *s)
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;
if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY ||
matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
if (unaccounted & (AV_CH_BACK_LEFT | AV_CH_SIDE_LEFT)) {
matrix[FRONT_LEFT ][BACK_CENTER] -= s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_CENTER] += s->slev * M_SQRT1_2;
} else {
matrix[FRONT_LEFT ][BACK_CENTER] -= s->slev;
matrix[FRONT_RIGHT][BACK_CENTER] += s->slev;
}
} else {
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
@ -198,8 +210,20 @@ static int auto_matrix(SwrContext *s)
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;
if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) {
matrix[FRONT_LEFT ][BACK_LEFT ] -= s->slev * M_SQRT1_2;
matrix[FRONT_LEFT ][BACK_RIGHT] -= s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_LEFT ] += s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_RIGHT] += s->slev * M_SQRT1_2;
} else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
matrix[FRONT_LEFT ][BACK_LEFT ] -= s->slev * SQRT3_2;
matrix[FRONT_LEFT ][BACK_RIGHT] -= s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_LEFT ] += s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_RIGHT] += s->slev * SQRT3_2;
} else {
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;
@ -222,8 +246,20 @@ static int auto_matrix(SwrContext *s)
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;
if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) {
matrix[FRONT_LEFT ][SIDE_LEFT ] -= s->slev * M_SQRT1_2;
matrix[FRONT_LEFT ][SIDE_RIGHT] -= s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][SIDE_LEFT ] += s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][SIDE_RIGHT] += s->slev * M_SQRT1_2;
} else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
matrix[FRONT_LEFT ][SIDE_LEFT ] -= s->slev * SQRT3_2;
matrix[FRONT_LEFT ][SIDE_RIGHT] -= s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][SIDE_LEFT ] += s->slev * M_SQRT1_2;
matrix[FRONT_RIGHT][SIDE_RIGHT] += s->slev * SQRT3_2;
} else {
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;

4
libswresample/swresample.c
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@ -88,6 +88,10 @@ static const AVOption options[]={
, OFFSET(soft_compensation_duration),AV_OPT_TYPE_FLOAT ,{.dbl=1 }, 0 , INT_MAX , PARAM },
{"max_soft_comp" , "Maximum factor by which data is stretched/squeezed to make it match the timestamps."
, OFFSET(max_soft_compensation),AV_OPT_TYPE_FLOAT ,{.dbl=0 }, INT_MIN, INT_MAX , PARAM },
{ "matrix_encoding" , "Matrixed Stereo Encoding" , OFFSET(matrix_encoding), AV_OPT_TYPE_INT ,{.i64 = AV_MATRIX_ENCODING_NONE}, AV_MATRIX_ENCODING_NONE, AV_MATRIX_ENCODING_NB-1, PARAM, "matrix_encoding" },
{ "none", "None", 0, AV_OPT_TYPE_CONST, { .i64 = AV_MATRIX_ENCODING_NONE }, INT_MIN, INT_MAX, PARAM, "matrix_encoding" },
{ "dolby", "Dolby", 0, AV_OPT_TYPE_CONST, { .i64 = AV_MATRIX_ENCODING_DOLBY }, INT_MIN, INT_MAX, PARAM, "matrix_encoding" },
{ "dplii", "Dolby Pro Logic II", 0, AV_OPT_TYPE_CONST, { .i64 = AV_MATRIX_ENCODING_DPLII }, INT_MIN, INT_MAX, PARAM, "matrix_encoding" },
{ "filter_type" , "Filter Type" , OFFSET(filter_type) , AV_OPT_TYPE_INT , { .i64 = SWR_FILTER_TYPE_KAISER }, SWR_FILTER_TYPE_CUBIC, SWR_FILTER_TYPE_KAISER, PARAM, "filter_type" },
{ "cubic" , "Cubic" , 0 , AV_OPT_TYPE_CONST, { .i64 = SWR_FILTER_TYPE_CUBIC }, INT_MIN, INT_MAX, PARAM, "filter_type" },
{ "blackman_nuttall", "Blackman Nuttall Windowed Sinc", 0 , AV_OPT_TYPE_CONST, { .i64 = SWR_FILTER_TYPE_BLACKMAN_NUTTALL }, INT_MIN, INT_MAX, PARAM, "filter_type" },

4
libswresample/swresample_internal.h
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@ -22,6 +22,9 @@
#define SWR_INTERNAL_H
#include "swresample.h"
#include "libavutil/audioconvert.h"
#define SQRT3_2 1.22474487139158904909 /* sqrt(3/2) */
typedef void (mix_1_1_func_type)(void *out, const void *in, void *coeffp, int index, int len);
typedef void (mix_2_1_func_type)(void *out, const void *in1, const void *in2, void *coeffp, int index1, int index2, int len);
@ -54,6 +57,7 @@ struct SwrContext {
float clev; ///< center mixing level
float lfe_mix_level; ///< LFE mixing level
float rematrix_volume; ///< rematrixing volume coefficient
enum AVMatrixEncoding matrix_encoding; /**< matrixed stereo encoding */
const int *channel_map; ///< channel index (or -1 if muted channel) map
int used_ch_count; ///< number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)
enum SwrDitherType dither_method;

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