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channelmix: normalize matrix to avoid clipping

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This commit is contained in:
Wim Taymans 2020-09-02 18:36:42 +02:00
parent b8d65895c2
commit 5dea431372
1 changed files with 4 additions and 7 deletions
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11
spa/plugins/audioconvert/channelmix-ops.c
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@ -166,7 +166,6 @@ static int make_matrix(struct channelmix *mix)
float clev = SQRT1_2;
float slev = SQRT1_2;
float llev = 0.5f;
float max;
spa_log_debug(mix->log, "src-mask:%08"PRIx64" dst-mask:%08"PRIx64,
src_mask, dst_mask);
@ -329,8 +328,6 @@ static int make_matrix(struct channelmix *mix)
spa_log_warn(mix->log, "can't assign LFE");
}
}
max = 0.0f;
for (ic = 0, i = 0; i < NUM_CHAN; i++) {
float sum = 0.0f;
if ((dst_mask & (1UL << (i + 2))) == 0)
@ -341,8 +338,10 @@ static int make_matrix(struct channelmix *mix)
mix->matrix_orig[ic][jc++] = matrix[i][j];
sum += fabs(matrix[i][j]);
}
if (sum > 1.0f)
for (j = 0; j < jc; j++)
mix->matrix_orig[ic][j] /= sum;
ic++;
max = SPA_MAX(max, sum);
}
return 0;
}
@ -351,19 +350,17 @@ static void impl_channelmix_set_volume(struct channelmix *mix, float volume, boo
uint32_t n_channel_volumes, float *channel_volumes)
{
float volumes[SPA_AUDIO_MAX_CHANNELS];
float vol = mute ? 0.0f : volume, sum, t;
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;
/** apply global volume to channels */
sum = 0.0;
mix->norm = true;
for (i = 0; i < n_channel_volumes; i++) {
volumes[i] = channel_volumes[i] * vol;
if (volumes[i] != 1.0f)
mix->norm = false;
sum += volumes[i];
}
if (n_channel_volumes == src_chan) {