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pipewire/spa/plugins/audioconvert/channelmix-ops.c
Wim Taymans b7279a1728 channelmix: dont make FC from synthesized FC 
When we have stereo and need to make FC, don't try to upmix the
stereo into FC again.
Fix unit test now that we create FC channels.
2022-01-11 17:25:38 +01:00

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/* Spa
*
* Copyright © 2018 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <spa/param/audio/format-utils.h>
#include <spa/support/cpu.h>
#include <spa/support/log.h>
#include <spa/utils/defs.h>
#define VOLUME_MIN 0.0f
#define VOLUME_NORM 1.0f
#include "channelmix-ops.h"
#undef SPA_LOG_TOPIC_DEFAULT
#define SPA_LOG_TOPIC_DEFAULT log_topic
struct spa_log_topic *log_topic = &SPA_LOG_TOPIC(0, "spa.channelmix");
#define _M(ch) (1UL << SPA_AUDIO_CHANNEL_ ## ch)
#define MASK_MONO _M(FC)|_M(MONO)|_M(UNKNOWN)
#define MASK_STEREO _M(FL)|_M(FR)|_M(UNKNOWN)
#define MASK_QUAD _M(FL)|_M(FR)|_M(RL)|_M(RR)|_M(UNKNOWN)
#define MASK_3_1 _M(FL)|_M(FR)|_M(FC)|_M(LFE)
#define MASK_5_1 _M(FL)|_M(FR)|_M(FC)|_M(LFE)|_M(SL)|_M(SR)|_M(RL)|_M(RR)
#define MASK_7_1 _M(FL)|_M(FR)|_M(FC)|_M(LFE)|_M(SL)|_M(SR)|_M(RL)|_M(RR)
#define ANY ((uint32_t)-1)
#define EQ ((uint32_t)-2)
typedef void (*channelmix_func_t) (struct channelmix *mix, uint32_t n_dst, void * SPA_RESTRICT dst[n_dst],
uint32_t n_src, const void * SPA_RESTRICT src[n_src], uint32_t n_samples);
static const struct channelmix_info {
uint32_t src_chan;
uint64_t src_mask;
uint32_t dst_chan;
uint64_t dst_mask;
channelmix_func_t process;
uint32_t cpu_flags;
const char *name;
} channelmix_table[] =
{
#if defined (HAVE_SSE)
{ 2, MASK_MONO, 2, MASK_MONO, channelmix_copy_sse, SPA_CPU_FLAG_SSE, "copy_sse" },
{ 2, MASK_STEREO, 2, MASK_STEREO, channelmix_copy_sse, SPA_CPU_FLAG_SSE, "copy_sse" },
{ EQ, 0, EQ, 0, channelmix_copy_sse, SPA_CPU_FLAG_SSE, "copy_sse" },
#endif
{ 2, MASK_MONO, 2, MASK_MONO, channelmix_copy_c, 0, "copy_c" },
{ 2, MASK_STEREO, 2, MASK_STEREO, channelmix_copy_c, 0, "copy_c" },
{ EQ, 0, EQ, 0, channelmix_copy_c, 0 },
{ 1, MASK_MONO, 2, MASK_STEREO, channelmix_f32_1_2_c, 0, "f32_1_2_c" },
{ 2, MASK_STEREO, 1, MASK_MONO, channelmix_f32_2_1_c, 0, "f32_2_1_c" },
{ 4, MASK_QUAD, 1, MASK_MONO, channelmix_f32_4_1_c, 0, "f32_4_1_c" },
{ 4, MASK_3_1, 1, MASK_MONO, channelmix_f32_3p1_1_c, 0, "f32_3p1_1_c" },
#if defined (HAVE_SSE)
{ 2, MASK_STEREO, 4, MASK_QUAD, channelmix_f32_2_4_sse, SPA_CPU_FLAG_SSE, "f32_2_4_sse" },
#endif
{ 2, MASK_STEREO, 4, MASK_QUAD, channelmix_f32_2_4_c, 0, "f32_2_4_c" },
{ 2, MASK_STEREO, 4, MASK_3_1, channelmix_f32_2_3p1_c, 0, "f32_2_3p1_c" },
{ 2, MASK_STEREO, 6, MASK_5_1, channelmix_f32_2_5p1_c, 0, "f32_2_5p1_c" },
#if defined (HAVE_SSE)
{ 6, MASK_5_1, 2, MASK_STEREO, channelmix_f32_5p1_2_sse, SPA_CPU_FLAG_SSE, "f32_5p1_2_sse" },
#endif
{ 6, MASK_5_1, 2, MASK_STEREO, channelmix_f32_5p1_2_c, 0, "f32_5p1_2_c" },
#if defined (HAVE_SSE)
{ 6, MASK_5_1, 4, MASK_QUAD, channelmix_f32_5p1_4_sse, SPA_CPU_FLAG_SSE, "f32_5p1_4_sse" },
#endif
{ 6, MASK_5_1, 4, MASK_QUAD, channelmix_f32_5p1_4_c, 0, "f32_5p1_4_c" },
#if defined (HAVE_SSE)
{ 6, MASK_5_1, 4, MASK_3_1, channelmix_f32_5p1_3p1_sse, SPA_CPU_FLAG_SSE, "f32_5p1_3p1_sse" },
#endif
{ 6, MASK_5_1, 4, MASK_3_1, channelmix_f32_5p1_3p1_c, 0, "f32_5p1_3p1_c" },
{ 8, MASK_7_1, 2, MASK_STEREO, channelmix_f32_7p1_2_c, 0, "f32_7p1_2_c" },
{ 8, MASK_7_1, 4, MASK_QUAD, channelmix_f32_7p1_4_c, 0, "f32_7p1_4_c" },
{ 8, MASK_7_1, 4, MASK_3_1, channelmix_f32_7p1_3p1_c, 0, "f32_7p1_3p1_c" },
{ ANY, 0, ANY, 0, channelmix_f32_n_m_c, 0, "f32_n_m_c" },
};
#define MATCH_CHAN(a,b) ((a) == ANY || (a) == (b))
#define MATCH_CPU_FLAGS(a,b) ((a) == 0 || ((a) & (b)) == a)
#define MATCH_MASK(a,b) ((a) == 0 || ((a) & (b)) == (b))
static const struct channelmix_info *find_channelmix_info(uint32_t src_chan, uint64_t src_mask,
uint32_t dst_chan, uint64_t dst_mask, uint32_t cpu_flags)
{
size_t i;
for (i = 0; i < SPA_N_ELEMENTS(channelmix_table); i++) {
if (!MATCH_CPU_FLAGS(channelmix_table[i].cpu_flags, cpu_flags))
continue;
if (src_chan == dst_chan && src_mask == dst_mask)
return &channelmix_table[i];
if (MATCH_CHAN(channelmix_table[i].src_chan, src_chan) &&
MATCH_CHAN(channelmix_table[i].dst_chan, dst_chan) &&
MATCH_MASK(channelmix_table[i].src_mask, src_mask) &&
MATCH_MASK(channelmix_table[i].dst_mask, dst_mask))
return &channelmix_table[i];
}
return NULL;
}
#define SQRT3_2 1.224744871f /* sqrt(3/2) */
#define SQRT1_2 0.707106781f
#define SQRT2 1.414213562f
#define MATRIX_NORMAL 0
#define MATRIX_DOLBY 1
#define MATRIX_DPLII 2
#define _CH(ch) ((SPA_AUDIO_CHANNEL_ ## ch)-3)
#define _MASK(ch) (1ULL << _CH(ch))
#define FRONT (_MASK(FC))
#define STEREO (_MASK(FL)|_MASK(FR))
#define REAR (_MASK(RL)|_MASK(RR))
#define SIDE (_MASK(SL)|_MASK(SR))
static int make_matrix(struct channelmix *mix)
{
float matrix[SPA_AUDIO_MAX_CHANNELS][SPA_AUDIO_MAX_CHANNELS] = {{ 0.0f }};
uint64_t src_mask = mix->src_mask;
uint64_t dst_mask = mix->dst_mask;
uint64_t unassigned, keep;
uint32_t i, j, ic, jc, matrix_encoding = MATRIX_NORMAL;
float clev = SQRT1_2;
float slev = SQRT1_2;
float llev = 0.5f;
float maxsum = 0.0f;
#define _MATRIX(s,d) matrix[_CH(s)][_CH(d)]
spa_log_debug(mix->log, "src-mask:%08"PRIx64" dst-mask:%08"PRIx64
" options:%08x", src_mask, dst_mask, mix->options);
/* move the MONO mask to FRONT so that the lower bits can be shifted
* away. */
if ((src_mask & (1Ull << SPA_AUDIO_CHANNEL_MONO)) != 0) {
if (mix->src_chan == 1)
src_mask = 0;
else
src_mask |= (1ULL << SPA_AUDIO_CHANNEL_FC);
}
if ((dst_mask & (1Ull << SPA_AUDIO_CHANNEL_MONO)) != 0)
dst_mask |= (1ULL << SPA_AUDIO_CHANNEL_FC);
/* shift so that bit 0 is FL */
src_mask >>= 3;
dst_mask >>= 3;
/* unknown channels or just 1 channel */
if (src_mask == 0 || dst_mask == 0) {
if (mix->src_chan == 1) {
/* one FC/MONO src goes everywhere */
spa_log_debug(mix->log, "distribute FC/MONO");
for (i = 0; i < SPA_AUDIO_MAX_CHANNELS; i++)
matrix[i][0]= 1.0f;
} else if (mix->dst_chan == 1) {
/* one FC/MONO dst get average of everything */
spa_log_debug(mix->log, "average FC/MONO");
for (i = 0; i < SPA_AUDIO_MAX_CHANNELS; i++)
matrix[0][i]= 1.0f / mix->src_chan;
} else {
/* just pair channels */
spa_log_debug(mix->log, "pairing channels");
for (i = 0; i < SPA_AUDIO_MAX_CHANNELS; i++)
matrix[i][i]= 1.0f;
}
src_mask = dst_mask = ~0LU;
goto done;
} else {
spa_log_debug(mix->log, "matching channels");
for (i = 0; i < SPA_AUDIO_MAX_CHANNELS; i++) {
if ((src_mask & dst_mask & (1ULL << i))) {
spa_log_debug(mix->log, "matched %u", i);
matrix[i][i]= 1.0f;
}
}
}
unassigned = src_mask & ~dst_mask;
keep = dst_mask & ~src_mask;
if (!SPA_FLAG_IS_SET(mix->options, CHANNELMIX_OPTION_UPMIX))
keep = 0;
keep |= FRONT;
if (mix->lfe_cutoff > 0.0f)
keep |= _MASK(LFE);
spa_log_debug(mix->log, "unassigned downmix %08" PRIx64, unassigned);
if (unassigned & FRONT){
if ((dst_mask & STEREO) == STEREO){
spa_log_debug(mix->log, "assign FC to STEREO");
if(src_mask & STEREO) {
_MATRIX(FL,FC) += clev;
_MATRIX(FR,FC) += clev;
} else {
_MATRIX(FL,FC) += SQRT1_2;
_MATRIX(FR,FC) += SQRT1_2;
}
} else {
spa_log_warn(mix->log, "can't assign FC");
}
}
if (unassigned & STEREO){
if (dst_mask & FRONT) {
spa_log_debug(mix->log, "assign STEREO to FC");
_MATRIX(FC,FL) += SQRT1_2;
_MATRIX(FC,FR) += SQRT1_2;
if (src_mask & FRONT)
_MATRIX(FC,FC) = clev * SQRT2;
keep &= ~FRONT;
} else {
spa_log_warn(mix->log, "can't assign STEREO");
}
}
if (unassigned & _MASK(RC)) {
if (dst_mask & REAR){
spa_log_debug(mix->log, "assign RC to RL+RR");
_MATRIX(RL,RC) += SQRT1_2;
_MATRIX(RR,RC) += SQRT1_2;
} else if (dst_mask & SIDE) {
spa_log_debug(mix->log, "assign RC to SL+SR");
_MATRIX(SL,RC) += SQRT1_2;
_MATRIX(SR,RC) += SQRT1_2;
} else if(dst_mask & STEREO) {
spa_log_debug(mix->log, "assign RC to FL+FR");
if (matrix_encoding == MATRIX_DOLBY ||
matrix_encoding == MATRIX_DPLII) {
if (unassigned & (_MASK(RL)|_MASK(RR))) {
_MATRIX(FL,RC) -= slev * SQRT1_2;
_MATRIX(FR,RC) += slev * SQRT1_2;
} else {
_MATRIX(FL,RC) -= slev;
_MATRIX(FR,RC) += slev;
}
} else {
_MATRIX(FL,RC) += slev * SQRT1_2;
_MATRIX(FR,RC) += slev * SQRT1_2;
}
} else if (dst_mask & FRONT) {
spa_log_debug(mix->log, "assign RC to FC");
_MATRIX(FC,RC) += slev * SQRT1_2;
} else {
spa_log_warn(mix->log, "can't assign RC");
}
}
if (unassigned & REAR) {
if (dst_mask & _MASK(RC)) {
spa_log_debug(mix->log, "assign RL+RR to RC");
_MATRIX(RC,RL) += SQRT1_2;
_MATRIX(RC,RR) += SQRT1_2;
} else if (dst_mask & SIDE) {
spa_log_debug(mix->log, "assign RL+RR to SL+SR");
if (src_mask & SIDE) {
_MATRIX(SL,RL) += SQRT1_2;
_MATRIX(SR,RR) += SQRT1_2;
} else {
_MATRIX(SL,RL) += 1.0f;
_MATRIX(SR,RR) += 1.0f;
}
} else if (dst_mask & STEREO) {
spa_log_debug(mix->log, "assign RL+RR to FL+FR %f", slev);
if (matrix_encoding == MATRIX_DOLBY) {
_MATRIX(FL,RL) -= slev * SQRT1_2;
_MATRIX(FL,RR) -= slev * SQRT1_2;
_MATRIX(FR,RL) += slev * SQRT1_2;
_MATRIX(FR,RR) += slev * SQRT1_2;
} else if (matrix_encoding == MATRIX_DPLII) {
_MATRIX(FL,RL) -= slev * SQRT3_2;
_MATRIX(FL,RR) -= slev * SQRT1_2;
_MATRIX(FR,RL) += slev * SQRT1_2;
_MATRIX(FR,RR) += slev * SQRT3_2;
} else {
_MATRIX(FL,RL) += slev;
_MATRIX(FR,RR) += slev;
}
} else if (dst_mask & FRONT) {
spa_log_debug(mix->log, "assign RL+RR to FC");
_MATRIX(FC,RL)+= slev * SQRT1_2;
_MATRIX(FC,RR)+= slev * SQRT1_2;
} else {
spa_log_warn(mix->log, "can't assign RL");
}
}
if (unassigned & SIDE) {
if (dst_mask & REAR) {
spa_log_debug(mix->log, "assign SL+SR to RL+RR");
if (src_mask & _MASK(RL)) {
_MATRIX(RL,SL) += SQRT1_2;
_MATRIX(RR,SR) += SQRT1_2;
} else {
_MATRIX(RL,SL) += 1.0f;
_MATRIX(RR,SR) += 1.0f;
}
} else if (dst_mask & _MASK(RC)) {
spa_log_debug(mix->log, "assign SL+SR to RC");
_MATRIX(RC,SL)+= SQRT1_2;
_MATRIX(RC,SR)+= SQRT1_2;
} else if (dst_mask & STEREO) {
spa_log_debug(mix->log, "assign SL+SR to FL+FR");
if (matrix_encoding == MATRIX_DOLBY) {
_MATRIX(FL,SL) -= slev * SQRT1_2;
_MATRIX(FL,SR) -= slev * SQRT1_2;
_MATRIX(FR,SL) += slev * SQRT1_2;
_MATRIX(FR,SR) += slev * SQRT1_2;
} else if (matrix_encoding == MATRIX_DPLII) {
_MATRIX(FL,SL) -= slev * SQRT3_2;
_MATRIX(FL,SR) -= slev * SQRT1_2;
_MATRIX(FR,SL) += slev * SQRT1_2;
_MATRIX(FR,SR) += slev * SQRT3_2;
} else {
_MATRIX(FL,SL) += slev;
_MATRIX(FR,SR) += slev;
}
} else if (dst_mask & FRONT) {
spa_log_debug(mix->log, "assign SL+SR to FC");
_MATRIX(FC,SL) += slev * SQRT1_2;
_MATRIX(FC,SR) += slev * SQRT1_2;
} else {
spa_log_warn(mix->log, "can't assign SL");
}
}
if (unassigned & _MASK(FLC)) {
if (dst_mask & STEREO) {
spa_log_debug(mix->log, "assign FLC+FRC to FL+FR");
_MATRIX(FL,FLC)+= 1.0f;
_MATRIX(FR,FRC)+= 1.0f;
} else if(dst_mask & FRONT) {
spa_log_debug(mix->log, "assign FLC+FRC to FC");
_MATRIX(FC,FLC)+= SQRT1_2;
_MATRIX(FC,FRC)+= SQRT1_2;
} else {
spa_log_warn(mix->log, "can't assign FLC");
}
}
if (unassigned & _MASK(LFE) &&
SPA_FLAG_IS_SET(mix->options, CHANNELMIX_OPTION_MIX_LFE)) {
if (dst_mask & FRONT) {
spa_log_debug(mix->log, "assign LFE to FC");
_MATRIX(FC,LFE) += llev;
} else if (dst_mask & STEREO) {
spa_log_debug(mix->log, "assign LFE to FL+FR");
_MATRIX(FL,LFE) += llev * SQRT1_2;
_MATRIX(FR,LFE) += llev * SQRT1_2;
} else {
spa_log_warn(mix->log, "can't assign LFE");
}
}
unassigned = dst_mask & ~src_mask & keep;
spa_log_debug(mix->log, "unassigned upmix %08"PRIx64" lfe:%f",
unassigned, mix->lfe_cutoff);
if (unassigned & FRONT) {
if ((src_mask & STEREO) == STEREO) {
spa_log_debug(mix->log, "produce FC from STEREO");
_MATRIX(FC,FL) += clev;
_MATRIX(FC,FR) += clev;
} else {
spa_log_warn(mix->log, "can't produce FC");
}
}
if (unassigned & _MASK(LFE)) {
if ((src_mask & STEREO) == STEREO) {
spa_log_debug(mix->log, "produce LFE from STEREO");
_MATRIX(LFE,FL) += llev;
_MATRIX(LFE,FR) += llev;
} else if ((src_mask & FRONT) == FRONT) {
spa_log_debug(mix->log, "produce LFE from FC");
_MATRIX(LFE,FC) += llev;
} else {
spa_log_warn(mix->log, "can't produce LFE");
}
}
if (unassigned & SIDE) {
if ((src_mask & REAR) == REAR) {
spa_log_debug(mix->log, "produce SIDE from REAR");
_MATRIX(SL,RL) += 1.0f;
_MATRIX(SR,RR) += 1.0f;
} else if ((src_mask & STEREO) == STEREO) {
spa_log_debug(mix->log, "produce SIDE from STEREO");
_MATRIX(SL,FL) += 1.0f;
_MATRIX(SR,FR) += 1.0f;
} else if ((src_mask & FRONT) == FRONT) {
spa_log_debug(mix->log, "produce SIDE from FC");
_MATRIX(SL,FC) += clev;
_MATRIX(SR,FC) += clev;
}
}
if (unassigned & REAR) {
if ((src_mask & SIDE) == SIDE) {
spa_log_debug(mix->log, "produce REAR from SIDE");
_MATRIX(RL,SL) += 1.0f;
_MATRIX(RR,SR) += 1.0f;
} else if ((src_mask & STEREO) == STEREO) {
spa_log_debug(mix->log, "produce REAR from STEREO");
_MATRIX(RL,FL) += 1.0f;
_MATRIX(RR,FR) += 1.0f;
} else if ((src_mask & FRONT) == FRONT) {
spa_log_debug(mix->log, "produce REAR from FC");
_MATRIX(RL,FC) += clev;
_MATRIX(RR,FC) += clev;
}
}
done:
for (jc = 0, ic = 0, i = 0; i < SPA_AUDIO_MAX_CHANNELS; i++) {
float sum = 0.0f;
if ((dst_mask & (1UL << i)) == 0)
continue;
for (jc = 0, j = 0; j < SPA_AUDIO_MAX_CHANNELS; j++) {
if ((src_mask & (1UL << j)) == 0)
continue;
mix->matrix_orig[ic][jc++] = matrix[i][j];
sum += fabs(matrix[i][j]);
}
maxsum = SPA_MAX(maxsum, sum);
if (i == _CH(LFE) && mix->lfe_cutoff > 0.0f) {
spa_log_debug(mix->log, "channel %d is LFE", ic);
lr4_set(&mix->lr4[ic], BQ_LOWPASS, mix->lfe_cutoff / mix->freq);
mix->lr4_info[ic] = 1;
} else {
mix->lr4_info[ic] = 0;
}
ic++;
}
if (SPA_FLAG_IS_SET(mix->options, CHANNELMIX_OPTION_NORMALIZE) &&
maxsum > 1.0f) {
spa_log_debug(mix->log, "normalize %f", maxsum);
for (i = 0; i < ic; i++)
for (j = 0; j < jc; j++)
mix->matrix_orig[i][j] /= maxsum;
}
return 0;
}
static void impl_channelmix_set_volume(struct channelmix *mix, float volume, bool mute,
uint32_t n_channel_volumes, float *channel_volumes)
{
float volumes[SPA_AUDIO_MAX_CHANNELS];
float vol = mute ? 0.0f : volume, t;
uint32_t i, j;
uint32_t src_chan = mix->src_chan;
uint32_t dst_chan = mix->dst_chan;
spa_log_debug(mix->log, "volume:%f mute:%d n_volumes:%d", volume, mute, n_channel_volumes);
/** apply global volume to channels */
for (i = 0; i < n_channel_volumes; i++) {
volumes[i] = channel_volumes[i] * vol;
spa_log_debug(mix->log, "%d: %f * %f = %f", i, channel_volumes[i], vol, volumes[i]);
}
/** apply volumes per channel */
if (n_channel_volumes == src_chan) {
for (i = 0; i < dst_chan; i++) {
for (j = 0; j < src_chan; j++) {
mix->matrix[i][j] = mix->matrix_orig[i][j] * volumes[j];
}
}
} else if (n_channel_volumes == dst_chan) {
for (i = 0; i < dst_chan; i++) {
for (j = 0; j < src_chan; j++) {
mix->matrix[i][j] = mix->matrix_orig[i][j] * volumes[i];
}
}
}
SPA_FLAG_SET(mix->flags, CHANNELMIX_FLAG_ZERO);
SPA_FLAG_SET(mix->flags, CHANNELMIX_FLAG_EQUAL);
SPA_FLAG_SET(mix->flags, CHANNELMIX_FLAG_COPY);
t = 0.0;
for (i = 0; i < dst_chan; i++) {
for (j = 0; j < src_chan; j++) {
float v = mix->matrix[i][j];
spa_log_debug(mix->log, "%d %d: %f", i, j, v);
if (i == 0 && j == 0)
t = v;
else if (t != v)
SPA_FLAG_CLEAR(mix->flags, CHANNELMIX_FLAG_EQUAL);
if (v != 0.0)
SPA_FLAG_CLEAR(mix->flags, CHANNELMIX_FLAG_ZERO);
if ((i == j && v != 1.0f) ||
(i != j && v != 0.0f))
SPA_FLAG_CLEAR(mix->flags, CHANNELMIX_FLAG_COPY);
}
}
SPA_FLAG_UPDATE(mix->flags, CHANNELMIX_FLAG_IDENTITY,
dst_chan == src_chan && SPA_FLAG_IS_SET(mix->flags, CHANNELMIX_FLAG_COPY));
spa_log_debug(mix->log, "flags:%08x", mix->flags);
}
static void impl_channelmix_free(struct channelmix *mix)
{
mix->process = NULL;
}
int channelmix_init(struct channelmix *mix)
{
const struct channelmix_info *info;
info = find_channelmix_info(mix->src_chan, mix->src_mask, mix->dst_chan, mix->dst_mask,
mix->cpu_flags);
if (info == NULL)
return -ENOTSUP;
spa_log_debug(mix->log, "selected %s", info->name);
mix->free = impl_channelmix_free;
mix->process = info->process;
mix->set_volume = impl_channelmix_set_volume;
mix->cpu_flags = info->cpu_flags;
return make_matrix(mix);
}
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