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Add mono audio support to WASAPI #76541

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May 12, 2023
Merged

Add mono audio support to WASAPI #76541

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23 changes: 22 additions & 1 deletion drivers/wasapi/audio_driver_wasapi.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -480,6 +480,14 @@ Error AudioDriverWASAPI::init_output_device(bool p_reinit) {
}

switch (audio_output.channels) {
case 1: // Mono
case 3: // Surround 2.1
case 5: // Surround 5.0
case 7: // Surround 7.0
// We will downmix as required.
channels = audio_output.channels + 1;
break;

case 2: // Stereo
case 4: // Surround 3.1
case 6: // Surround 5.1
Expand All @@ -499,7 +507,7 @@ Error AudioDriverWASAPI::init_output_device(bool p_reinit) {
input_position = 0;
input_size = 0;

print_verbose("WASAPI: detected " + itos(channels) + " channels");
print_verbose("WASAPI: detected " + itos(audio_output.channels) + " channels");
print_verbose("WASAPI: audio buffer frames: " + itos(buffer_frames) + " calculated latency: " + itos(buffer_frames * 1000 / mix_rate) + "ms");

return OK;
Expand Down Expand Up @@ -746,6 +754,19 @@ void AudioDriverWASAPI::thread_func(void *p_udata) {
for (unsigned int i = 0; i < write_frames * ad->channels; i++) {
ad->write_sample(ad->audio_output.format_tag, ad->audio_output.bits_per_sample, buffer, i, ad->samples_in.write[write_ofs++]);
}
} else if (ad->channels == ad->audio_output.channels + 1) {
// Pass all channels except the last two as-is, and then mix the last two
// together as one channel. E.g. stereo -> mono, or 3.1 -> 2.1.
unsigned int last_chan = ad->audio_output.channels - 1;
for (unsigned int i = 0; i < write_frames; i++) {
for (unsigned int j = 0; j < last_chan; j++) {
ad->write_sample(ad->audio_output.format_tag, ad->audio_output.bits_per_sample, buffer, i * ad->audio_output.channels + j, ad->samples_in.write[write_ofs++]);
}
int32_t l = ad->samples_in.write[write_ofs++];
int32_t r = ad->samples_in.write[write_ofs++];
int32_t c = (int32_t)(((int64_t)l + (int64_t)r) / 2);
ad->write_sample(ad->audio_output.format_tag, ad->audio_output.bits_per_sample, buffer, i * ad->audio_output.channels + last_chan, c);
}
} else {
for (unsigned int i = 0; i < write_frames; i++) {
for (unsigned int j = 0; j < MIN(ad->channels, ad->audio_output.channels); j++) {
Expand Down