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channelmix: add more generic upmixing

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Add options to enable lfe filtering and upmix.
Enable upmix by default, lfe is disabled because we don't actually
do a lowpass filter yet.
This commit is contained in:
Wim Taymans 2021-03-06 21:31:18 +01:00
parent c7309f0248
commit 6324298bc5
6 changed files with 67 additions and 17 deletions
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68
spa/plugins/audioconvert/channelmix-ops.c
View file

@ -220,22 +220,6 @@ static int make_matrix(struct channelmix *mix)
}
}
if (mix->src_chan <= 3 && (src_mask & STEREO) == STEREO && (dst_mask & REAR) == REAR) {
spa_log_debug(mix->log, "copy STEREO to REAR");
if ((src_mask & _MASK(RL)) == 0)
matrix[RL][FL] = 1.0f;
if ((src_mask & _MASK(RR)) == 0)
matrix[RR][FR] = 1.0f;
if ((dst_mask & SIDE) == SIDE) {
spa_log_debug(mix->log, "copy STEREO to SIDES");
if ((src_mask & _MASK(SL)) == 0)
matrix[SL][FL] = 1.0f;
if ((src_mask & _MASK(SR)) == 0)
matrix[SR][FR] = 1.0f;
}
}
if (unassigned & STEREO){
if (dst_mask & _MASK(FC)) {
spa_log_debug(mix->log, "assign STEREO to FC");
@ -384,6 +368,58 @@ static int make_matrix(struct channelmix *mix)
spa_log_warn(mix->log, "can't assign LFE");
}
}
if (!SPA_FLAG_IS_SET(mix->options, CHANNELMIX_OPTION_UPMIX))
goto done;
unassigned = dst_mask & ~src_mask;
spa_log_debug(mix->log, "unassigned upmix %08" PRIx64, unassigned);
if (unassigned & _MASK(FC)) {
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) &&
SPA_FLAG_IS_SET(mix->options, CHANNELMIX_OPTION_FILTER_LFE)) {
if ((src_mask & STEREO) == STEREO) {
spa_log_debug(mix->log, "produce LFE from STEREO");
matrix[LFE][FL] += llev;
matrix[LFE][FR] += 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;
}
}
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;
}
}
done:
for (jc = 0, ic = 0, i = 0; i < NUM_CHAN; i++) {
float sum = 0.0f;

2
spa/plugins/audioconvert/channelmix-ops.h
View file

@ -48,6 +48,8 @@ struct channelmix {
uint32_t cpu_flags;
#define CHANNELMIX_OPTION_MIX_LFE (1<<0) /**< mix LFE */
#define CHANNELMIX_OPTION_NORMALIZE (1<<1) /**< normalize volumes */
#define CHANNELMIX_OPTION_UPMIX (1<<2) /**< do simple upmixing */
#define CHANNELMIX_OPTION_FILTER_LFE (1<<3) /**< generate and filter LFE */
uint32_t options;
struct spa_log *log;

6
spa/plugins/audioconvert/channelmix.c
View file

@ -1250,6 +1250,12 @@ impl_init(const struct spa_handle_factory *factory,
if ((str = spa_dict_lookup(info, "channelmix.mix-lfe")) != NULL &&
(strcmp(str, "true") == 0 || atoi(str) != 0))
this->mix.options |= CHANNELMIX_OPTION_MIX_LFE;
if ((str = spa_dict_lookup(info, "channelmix.upmix")) != NULL &&
(strcmp(str, "true") == 0 || atoi(str) != 0))
this->mix.options |= CHANNELMIX_OPTION_UPMIX;
if ((str = spa_dict_lookup(info, "channelmix.filter-lfe")) != NULL &&
(strcmp(str, "true") == 0 || atoi(str) != 0))
this->mix.options |= CHANNELMIX_OPTION_FILTER_LFE;
if ((str = spa_dict_lookup(info, SPA_KEY_AUDIO_POSITION)) != NULL) {
size_t len;
const char *p = str;