Add mono audio support to WASAPI
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1 changed files with 22 additions and 1 deletions
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@ -480,6 +480,14 @@ Error AudioDriverWASAPI::init_output_device(bool p_reinit) {
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}
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switch (audio_output.channels) {
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case 1: // Mono
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case 3: // Surround 2.1
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case 5: // Surround 5.0
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case 7: // Surround 7.0
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// We will downmix as required.
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channels = audio_output.channels + 1;
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break;
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case 2: // Stereo
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case 4: // Surround 3.1
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case 6: // Surround 5.1
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@ -499,7 +507,7 @@ Error AudioDriverWASAPI::init_output_device(bool p_reinit) {
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input_position = 0;
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input_size = 0;
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print_verbose("WASAPI: detected " + itos(channels) + " channels");
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print_verbose("WASAPI: detected " + itos(audio_output.channels) + " channels");
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print_verbose("WASAPI: audio buffer frames: " + itos(buffer_frames) + " calculated latency: " + itos(buffer_frames * 1000 / mix_rate) + "ms");
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return OK;
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@ -746,6 +754,19 @@ void AudioDriverWASAPI::thread_func(void *p_udata) {
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for (unsigned int i = 0; i < write_frames * ad->channels; i++) {
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ad->write_sample(ad->audio_output.format_tag, ad->audio_output.bits_per_sample, buffer, i, ad->samples_in.write[write_ofs++]);
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}
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} else if (ad->channels == ad->audio_output.channels + 1) {
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// Pass all channels except the last two as-is, and then mix the last two
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// together as one channel. E.g. stereo -> mono, or 3.1 -> 2.1.
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unsigned int last_chan = ad->audio_output.channels - 1;
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for (unsigned int i = 0; i < write_frames; i++) {
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for (unsigned int j = 0; j < last_chan; j++) {
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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++]);
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}
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int32_t l = ad->samples_in.write[write_ofs++];
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int32_t r = ad->samples_in.write[write_ofs++];
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int32_t c = (int32_t)(((int64_t)l + (int64_t)r) / 2);
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ad->write_sample(ad->audio_output.format_tag, ad->audio_output.bits_per_sample, buffer, i * ad->audio_output.channels + last_chan, c);
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}
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} else {
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for (unsigned int i = 0; i < write_frames; i++) {
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for (unsigned int j = 0; j < MIN(ad->channels, ad->audio_output.channels); j++) {
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