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Support for uneven amount of channels on PulseAudio

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(cherry picked from commit 00693f4ad0)
This commit is contained in:
Marcelo Fernandez 2018-02-28 22:37:42 -03:00 committed by Hein-Pieter van Braam
parent 89e4125241
commit 985b84689f
2 changed files with 46 additions and 19 deletions
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62
drivers/pulseaudio/audio_driver_pulseaudio.cpp
View file

@ -156,38 +156,50 @@ Error AudioDriverPulseAudio::init() {
exit_thread = false;
mix_rate = GLOBAL_DEF("audio/mix_rate", DEFAULT_MIX_RATE);
channels = detect_channels();
switch (channels) {
// Detect the amount of channels PulseAudio is using
// Note: If using an even amount of channels (2, 4, etc) channels and pa_channels will be equal,
// if not then pa_channels will have the real amount of channels PulseAudio is using and channels
// will have the amount of channels Godot is using (in this case it's pa_channels + 1)
pa_channels = detect_channels();
switch (pa_channels) {
case 1: // Mono
case 3: // Surround 2.1
case 5: // Surround 5.0
case 7: // Surround 7.0
channels = pa_channels + 1;
break;
case 2: // Stereo
case 4: // Surround 3.1
case 4: // Surround 4.0
case 6: // Surround 5.1
case 8: // Surround 7.1
channels = pa_channels;
break;
default:
ERR_PRINTS("PulseAudio: Unsupported number of channels: " + itos(channels));
ERR_PRINTS("PulseAudio: Unsupported number of channels: " + itos(pa_channels));
ERR_FAIL_V(ERR_CANT_OPEN);
break;
}
pa_sample_spec spec;
spec.format = PA_SAMPLE_S16LE;
spec.channels = channels;
spec.channels = pa_channels;
spec.rate = mix_rate;
int latency = GLOBAL_DEF("audio/output_latency", DEFAULT_OUTPUT_LATENCY);
buffer_frames = closest_power_of_2(latency * mix_rate / 1000);
buffer_size = buffer_frames * channels;
pa_buffer_size = buffer_frames * pa_channels;
if (OS::get_singleton()->is_stdout_verbose()) {
print_line("PulseAudio: detected " + itos(channels) + " channels");
print_line("PulseAudio: detected " + itos(pa_channels) + " channels");
print_line("PulseAudio: audio buffer frames: " + itos(buffer_frames) + " calculated latency: " + itos(buffer_frames * 1000 / mix_rate) + "ms");
}
pa_buffer_attr attr;
// set to appropriate buffer length (in bytes) from global settings
attr.tlength = buffer_size * sizeof(int16_t);
attr.tlength = pa_buffer_size * sizeof(int16_t);
// set them to be automatically chosen
attr.prebuf = (uint32_t)-1;
attr.maxlength = (uint32_t)-1;
@ -209,8 +221,8 @@ Error AudioDriverPulseAudio::init() {
ERR_FAIL_COND_V(pulse == NULL, ERR_CANT_OPEN);
}
samples_in.resize(buffer_size);
samples_out.resize(buffer_size);
samples_in.resize(buffer_frames * channels);
samples_out.resize(pa_buffer_size);
mutex = Mutex::create();
thread = Thread::create(AudioDriverPulseAudio::thread_func, this);
@ -235,7 +247,7 @@ void AudioDriverPulseAudio::thread_func(void *p_udata) {
while (!ad->exit_thread) {
if (!ad->active) {
for (unsigned int i = 0; i < ad->buffer_size; i++) {
for (unsigned int i = 0; i < ad->pa_buffer_size; i++) {
ad->samples_out[i] = 0;
}
@ -246,15 +258,30 @@ void AudioDriverPulseAudio::thread_func(void *p_udata) {
ad->unlock();
for (unsigned int i = 0; i < ad->buffer_size; i++) {
ad->samples_out[i] = ad->samples_in[i] >> 16;
if (ad->channels == ad->pa_channels) {
for (unsigned int i = 0; i < ad->pa_buffer_size; i++) {
ad->samples_out[i] = ad->samples_in[i] >> 16;
}
} else {
// Uneven amount of channels
unsigned int in_idx = 0;
unsigned int out_idx = 0;
for (unsigned int i = 0; i < ad->buffer_frames; i++) {
for (unsigned int j = 0; j < ad->pa_channels - 1; j++) {
ad->samples_out[out_idx++] = ad->samples_in[in_idx++] >> 16;
}
uint32_t l = ad->samples_in[in_idx++];
uint32_t r = ad->samples_in[in_idx++];
ad->samples_out[out_idx++] = (l >> 1 + r >> 1) >> 16;
}
}
}
// pa_simple_write always consumes the entire buffer
int error_code;
int byte_size = ad->buffer_size * sizeof(int16_t);
int byte_size = ad->pa_buffer_size * sizeof(int16_t);
if (pa_simple_write(ad->pulse, ad->samples_out.ptr(), byte_size, &error_code) < 0) {
// can't recover here
fprintf(stderr, "PulseAudio failed and can't recover: %s\n", pa_strerror(error_code));
@ -328,17 +355,16 @@ AudioDriverPulseAudio::AudioDriverPulseAudio() {
samples_out.clear();
mix_rate = 0;
buffer_size = 0;
buffer_frames = 0;
pa_buffer_size = 0;
channels = 0;
pa_channels = 0;
active = false;
thread_exited = false;
exit_thread = false;
latency = 0;
buffer_frames = 0;
buffer_size = 0;
channels = 0;
}
AudioDriverPulseAudio::~AudioDriverPulseAudio() {

3
drivers/pulseaudio/audio_driver_pulseaudio.h
View file

@ -51,8 +51,9 @@ class AudioDriverPulseAudio : public AudioDriver {
unsigned int mix_rate;
unsigned int buffer_frames;
unsigned int buffer_size;
unsigned int pa_buffer_size;
int channels;
int pa_channels;
bool active;
bool thread_exited;