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[Downmixer] Only downmix to stereo if not stereo 

When downmixing to mono, only downmix to stereo first if the source is
not already stereo.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
main
Christopher Snowhill 2022-07-10 15:08:56 -07:00
parent 000a2e0cb6
commit 8bc9738ccb
1 changed files with 6 additions and 4 deletions
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10
Audio/Chain/Downmix.m
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@ -149,10 +149,12 @@ static void downmix_to_stereo(const float *inBuffer, int channels, uint32_t conf
static void downmix_to_mono(const float *inBuffer, int channels, uint32_t config, float *outBuffer, size_t count) {
float tempBuffer[count * 2];
downmix_to_stereo(inBuffer, channels, config, tempBuffer, count);
inBuffer = tempBuffer;
channels = 2;
config = AudioConfigStereo;
if(channels > 2 || config != AudioConfigStereo) {
downmix_to_stereo(inBuffer, channels, config, tempBuffer, count);
inBuffer = tempBuffer;
channels = 2;
config = AudioConfigStereo;
}
cblas_scopy((int)count, inBuffer, 2, outBuffer, 1);
vDSP_vadd(outBuffer, 1, inBuffer + 1, 2, outBuffer, 1, count);
}