av_cold int swr_build_matrix(uint64_t in_ch_layout_param, uint64_t out_ch_layout_param,
double center_mix_level, double surround_mix_level,
double lfe_mix_level, double maxval,
double rematrix_volume, double *matrix_param,
int stride, enum AVMatrixEncoding matrix_encoding, void *log_context)
{
int i, j, out_i;
double matrix[NUM_NAMED_CHANNELS][NUM_NAMED_CHANNELS]={{0}};
int64_t unaccounted, in_ch_layout, out_ch_layout;
double maxcoef=0;
char buf[128];
in_ch_layout = clean_layout(log_context, in_ch_layout_param);
out_ch_layout = clean_layout(log_context, out_ch_layout_param);
if( out_ch_layout == AV_CH_LAYOUT_STEREO_DOWNMIX
&& (in_ch_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == 0
)
out_ch_layout = AV_CH_LAYOUT_STEREO;
if( in_ch_layout == AV_CH_LAYOUT_STEREO_DOWNMIX
&& (out_ch_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == 0
)
in_ch_layout = AV_CH_LAYOUT_STEREO;
if(!sane_layout(in_ch_layout)){
av_get_channel_layout_string(buf, sizeof(buf), -1, in_ch_layout_param);
av_log(log_context, AV_LOG_ERROR, "Input channel layout '%s' is not supported\n", buf);
return AVERROR(EINVAL);
}
if(!sane_layout(out_ch_layout)){
av_get_channel_layout_string(buf, sizeof(buf), -1, out_ch_layout_param);
av_log(log_context, AV_LOG_ERROR, "Output channel layout '%s' is not supported\n", buf);
return AVERROR(EINVAL);
}
for(i=0; i<FF_ARRAY_ELEMS(matrix); i++){
if(in_ch_layout & out_ch_layout & (1ULL<<i))
matrix[i][i]= 1.0;
}
unaccounted= in_ch_layout & ~out_ch_layout;
//FIXME implement dolby surround
//FIXME implement full ac3
if(unaccounted & AV_CH_FRONT_CENTER){
if((out_ch_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO){
if(in_ch_layout & AV_CH_LAYOUT_STEREO) {
matrix[ FRONT_LEFT][FRONT_CENTER]+= center_mix_level;
matrix[FRONT_RIGHT][FRONT_CENTER]+= center_mix_level;
} else {
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(out_ch_layout & AV_CH_FRONT_CENTER){
matrix[FRONT_CENTER][ FRONT_LEFT]+= M_SQRT1_2;
matrix[FRONT_CENTER][FRONT_RIGHT]+= M_SQRT1_2;
if(in_ch_layout & AV_CH_FRONT_CENTER)
matrix[FRONT_CENTER][ FRONT_CENTER] = center_mix_level*sqrt(2);
}else
av_assert0(0);
}
if(unaccounted & AV_CH_BACK_CENTER){
if(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(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(out_ch_layout & AV_CH_FRONT_LEFT){
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] -= surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level * M_SQRT1_2;
} else {
matrix[FRONT_LEFT ][BACK_CENTER] -= surround_mix_level;
matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level;
}
} else {
matrix[ FRONT_LEFT][BACK_CENTER]+= surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_CENTER]+= surround_mix_level * M_SQRT1_2;
}
}else if(out_ch_layout & AV_CH_FRONT_CENTER){
matrix[ FRONT_CENTER][BACK_CENTER]+= surround_mix_level * M_SQRT1_2;
}else
av_assert0(0);
}
if(unaccounted & AV_CH_BACK_LEFT){
if(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(out_ch_layout & AV_CH_SIDE_LEFT){
if(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(out_ch_layout & AV_CH_FRONT_LEFT){
if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) {
matrix[FRONT_LEFT ][BACK_LEFT ] -= surround_mix_level * M_SQRT1_2;
matrix[FRONT_LEFT ][BACK_RIGHT] -= surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_LEFT ] += surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level * M_SQRT1_2;
} else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
matrix[FRONT_LEFT ][BACK_LEFT ] -= surround_mix_level * SQRT3_2;
matrix[FRONT_LEFT ][BACK_RIGHT] -= surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_LEFT ] += surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level * SQRT3_2;
} else {
matrix[ FRONT_LEFT][ BACK_LEFT] += surround_mix_level;
matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level;
}
}else if(out_ch_layout & AV_CH_FRONT_CENTER){
matrix[ FRONT_CENTER][BACK_LEFT ]+= surround_mix_level*M_SQRT1_2;
matrix[ FRONT_CENTER][BACK_RIGHT]+= surround_mix_level*M_SQRT1_2;
}else
av_assert0(0);
}
if(unaccounted & AV_CH_SIDE_LEFT){
if(out_ch_layout & AV_CH_BACK_LEFT){
/* if back channels do not exist in the input, just copy side
channels to back channels, otherwise mix side into back */
if (in_ch_layout & AV_CH_BACK_LEFT) {
matrix[BACK_LEFT ][SIDE_LEFT ] += M_SQRT1_2;
matrix[BACK_RIGHT][SIDE_RIGHT] += M_SQRT1_2;
} else {
matrix[BACK_LEFT ][SIDE_LEFT ] += 1.0;
matrix[BACK_RIGHT][SIDE_RIGHT] += 1.0;
}
}else if(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(out_ch_layout & AV_CH_FRONT_LEFT){
if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) {
matrix[FRONT_LEFT ][SIDE_LEFT ] -= surround_mix_level * M_SQRT1_2;
matrix[FRONT_LEFT ][SIDE_RIGHT] -= surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level * M_SQRT1_2;
} else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
matrix[FRONT_LEFT ][SIDE_LEFT ] -= surround_mix_level * SQRT3_2;
matrix[FRONT_LEFT ][SIDE_RIGHT] -= surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level * SQRT3_2;
} else {
matrix[ FRONT_LEFT][ SIDE_LEFT] += surround_mix_level;
matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level;
}
}else if(out_ch_layout & AV_CH_FRONT_CENTER){
matrix[ FRONT_CENTER][SIDE_LEFT ]+= surround_mix_level * M_SQRT1_2;
matrix[ FRONT_CENTER][SIDE_RIGHT]+= surround_mix_level * M_SQRT1_2;
}else
av_assert0(0);
}
if(unaccounted & AV_CH_FRONT_LEFT_OF_CENTER){
if(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(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);
}
/* mix LFE into front left/right or center */
if (unaccounted & AV_CH_LOW_FREQUENCY) {
if (out_ch_layout & AV_CH_FRONT_CENTER) {
matrix[FRONT_CENTER][LOW_FREQUENCY] += lfe_mix_level;
} else if (out_ch_layout & AV_CH_FRONT_LEFT) {
matrix[FRONT_LEFT ][LOW_FREQUENCY] += lfe_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][LOW_FREQUENCY] += lfe_mix_level * M_SQRT1_2;
} else
av_assert0(0);
}
for(out_i=i=0; i<64; i++){
double sum=0;
int in_i=0;
if((out_ch_layout & (1ULL<<i)) == 0)
continue;
for(j=0; j<64; j++){
if((in_ch_layout & (1ULL<<j)) == 0)
continue;
if (i < FF_ARRAY_ELEMS(matrix) && j < FF_ARRAY_ELEMS(matrix[0]))
matrix_param[stride*out_i + in_i] = matrix[i][j];
else
matrix_param[stride*out_i + in_i] = i == j && (in_ch_layout & out_ch_layout & (1ULL<<i));
sum += fabs(matrix_param[stride*out_i + in_i]);
in_i++;
}
maxcoef= FFMAX(maxcoef, sum);
out_i++;
}
if(rematrix_volume < 0)
maxcoef = -rematrix_volume;
if(maxcoef > maxval || rematrix_volume < 0){
maxcoef /= maxval;
for(i=0; i<SWR_CH_MAX; i++)
for(j=0; j<SWR_CH_MAX; j++){
matrix_param[stride*i + j] /= maxcoef;
}
}
if(rematrix_volume > 0){
for(i=0; i<SWR_CH_MAX; i++)
for(j=0; j<SWR_CH_MAX; j++){
matrix_param[stride*i + j] *= rematrix_volume;
}
}
av_log(log_context, AV_LOG_DEBUG, "Matrix coefficients:\n");
for(i=0; i<av_get_channel_layout_nb_channels(out_ch_layout); i++){
const char *c =
av_get_channel_name(av_channel_layout_extract_channel(out_ch_layout, i));
av_log(log_context, AV_LOG_DEBUG, "%s: ", c ? c : "?");
for(j=0; j<av_get_channel_layout_nb_channels(in_ch_layout); j++){
c = av_get_channel_name(av_channel_layout_extract_channel(in_ch_layout, j));
av_log(log_context, AV_LOG_DEBUG, "%s:%f ", c ? c : "?", matrix_param[stride*i + j]);
}
av_log(log_context, AV_LOG_DEBUG, "\n");
}
return 0;
}
av_cold static int auto_matrix(SwrContext *s)
{
int i, j, out_i;
double matrix[NUM_NAMED_CHANNELS][NUM_NAMED_CHANNELS]={{0}};
int64_t unaccounted, in_ch_layout, out_ch_layout;
double maxcoef=0;
char buf[128];
const int matrix_encoding = s->matrix_encoding;
float maxval;
in_ch_layout = clean_layout(s, s->in_ch_layout);
out_ch_layout = clean_layout(s, s->out_ch_layout);
if( out_ch_layout == AV_CH_LAYOUT_STEREO_DOWNMIX
&& (in_ch_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == 0
)
out_ch_layout = AV_CH_LAYOUT_STEREO;
if( in_ch_layout == AV_CH_LAYOUT_STEREO_DOWNMIX
&& (out_ch_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == 0
)
in_ch_layout = AV_CH_LAYOUT_STEREO;
if(!sane_layout(in_ch_layout)){
av_get_channel_layout_string(buf, sizeof(buf), -1, s->in_ch_layout);
av_log(s, AV_LOG_ERROR, "Input channel layout '%s' is not supported\n", buf);
return AVERROR(EINVAL);
}
if(!sane_layout(out_ch_layout)){
av_get_channel_layout_string(buf, sizeof(buf), -1, s->out_ch_layout);
av_log(s, AV_LOG_ERROR, "Output channel layout '%s' is not supported\n", buf);
return AVERROR(EINVAL);
}
memset(s->matrix, 0, sizeof(s->matrix));
for(i=0; i<FF_ARRAY_ELEMS(matrix); i++){
if(in_ch_layout & out_ch_layout & (1ULL<<i))
matrix[i][i]= 1.0;
}
unaccounted= in_ch_layout & ~out_ch_layout;
//FIXME implement dolby surround
//FIXME implement full ac3
if(unaccounted & AV_CH_FRONT_CENTER){
if((out_ch_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO){
if(in_ch_layout & AV_CH_LAYOUT_STEREO) {
matrix[ FRONT_LEFT][FRONT_CENTER]+= s->clev;
matrix[FRONT_RIGHT][FRONT_CENTER]+= s->clev;
} else {
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(out_ch_layout & AV_CH_FRONT_CENTER){
matrix[FRONT_CENTER][ FRONT_LEFT]+= M_SQRT1_2;
matrix[FRONT_CENTER][FRONT_RIGHT]+= M_SQRT1_2;
if(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(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(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(out_ch_layout & AV_CH_FRONT_LEFT){
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(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(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(out_ch_layout & AV_CH_SIDE_LEFT){
if(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(out_ch_layout & AV_CH_FRONT_LEFT){
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(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(out_ch_layout & AV_CH_BACK_LEFT){
/* if back channels do not exist in the input, just copy side
channels to back channels, otherwise mix side into back */
if (in_ch_layout & AV_CH_BACK_LEFT) {
matrix[BACK_LEFT ][SIDE_LEFT ] += M_SQRT1_2;
matrix[BACK_RIGHT][SIDE_RIGHT] += M_SQRT1_2;
} else {
matrix[BACK_LEFT ][SIDE_LEFT ] += 1.0;
matrix[BACK_RIGHT][SIDE_RIGHT] += 1.0;
}
}else if(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(out_ch_layout & AV_CH_FRONT_LEFT){
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(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(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(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);
}
/* mix LFE into front left/right or center */
if (unaccounted & AV_CH_LOW_FREQUENCY) {
if (out_ch_layout & AV_CH_FRONT_CENTER) {
matrix[FRONT_CENTER][LOW_FREQUENCY] += s->lfe_mix_level;
} else if (out_ch_layout & AV_CH_FRONT_LEFT) {
matrix[FRONT_LEFT ][LOW_FREQUENCY] += s->lfe_mix_level * M_SQRT1_2;
matrix[FRONT_RIGHT][LOW_FREQUENCY] += s->lfe_mix_level * M_SQRT1_2;
} else
av_assert0(0);
}
for(out_i=i=0; i<64; i++){
double sum=0;
int in_i=0;
if((out_ch_layout & (1ULL<<i)) == 0)
continue;
for(j=0; j<64; j++){
if((in_ch_layout & (1ULL<<j)) == 0)
continue;
if (i < FF_ARRAY_ELEMS(matrix) && j < FF_ARRAY_ELEMS(matrix[0]))
s->matrix[out_i][in_i]= matrix[i][j];
else
s->matrix[out_i][in_i]= i == j && (in_ch_layout & out_ch_layout & (1ULL<<i));
sum += fabs(s->matrix[out_i][in_i]);
in_i++;
}
maxcoef= FFMAX(maxcoef, sum);
out_i++;
}
if(s->rematrix_volume < 0)
maxcoef = -s->rematrix_volume;
if (s->rematrix_maxval > 0) {
maxval = s->rematrix_maxval;
} else if ( av_get_packed_sample_fmt(s->out_sample_fmt) < AV_SAMPLE_FMT_FLT
|| av_get_packed_sample_fmt(s->int_sample_fmt) < AV_SAMPLE_FMT_FLT) {
maxval = 1.0;
} else
maxval = INT_MAX;
if(maxcoef > maxval || s->rematrix_volume < 0){
maxcoef /= maxval;
for(i=0; i<SWR_CH_MAX; i++)
for(j=0; j<SWR_CH_MAX; j++){
s->matrix[i][j] /= maxcoef;
}
}
if(s->rematrix_volume > 0){
for(i=0; i<SWR_CH_MAX; i++)
for(j=0; j<SWR_CH_MAX; j++){
s->matrix[i][j] *= s->rematrix_volume;
}
}
av_log(s, AV_LOG_DEBUG, "Matrix coefficients:\n");
for(i=0; i<av_get_channel_layout_nb_channels(out_ch_layout); i++){
const char *c =
av_get_channel_name(av_channel_layout_extract_channel(out_ch_layout, i));
av_log(s, AV_LOG_DEBUG, "%s: ", c ? c : "?");
for(j=0; j<av_get_channel_layout_nb_channels(in_ch_layout); j++){
c = av_get_channel_name(av_channel_layout_extract_channel(in_ch_layout, j));
av_log(s, AV_LOG_DEBUG, "%s:%f ", c ? c : "?", s->matrix[i][j]);
}
av_log(s, AV_LOG_DEBUG, "\n");
}
return 0;
}
