godot/drivers/pulseaudio/audio_driver_pulseaudio.cpp
2017-09-12 15:13:28 -03:00

347 lines
8.9 KiB
C++

/*************************************************************************/
/* audio_driver_pulseaudio.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "audio_driver_pulseaudio.h"
#ifdef PULSEAUDIO_ENABLED
#include <pulse/pulseaudio.h>
#include "os/os.h"
#include "project_settings.h"
void pa_state_cb(pa_context *c, void *userdata) {
pa_context_state_t state;
int *pa_ready = (int *)userdata;
state = pa_context_get_state(c);
switch (state) {
case PA_CONTEXT_FAILED:
case PA_CONTEXT_TERMINATED:
*pa_ready = 2;
break;
case PA_CONTEXT_READY:
*pa_ready = 1;
break;
}
}
void sink_info_cb(pa_context *c, const pa_sink_info *l, int eol, void *userdata) {
unsigned int *channels = (unsigned int *)userdata;
// If eol is set to a positive number, you're at the end of the list
if (eol > 0) {
return;
}
*channels = l->channel_map.channels;
}
void server_info_cb(pa_context *c, const pa_server_info *i, void *userdata) {
char *default_output = (char *)userdata;
strncpy(default_output, i->default_sink_name, 1024);
}
static unsigned int detect_channels() {
pa_mainloop *pa_ml;
pa_mainloop_api *pa_mlapi;
pa_operation *pa_op;
pa_context *pa_ctx;
int state = 0;
int pa_ready = 0;
char default_output[1024];
unsigned int channels = 2;
pa_ml = pa_mainloop_new();
pa_mlapi = pa_mainloop_get_api(pa_ml);
pa_ctx = pa_context_new(pa_mlapi, "Godot");
int ret = pa_context_connect(pa_ctx, NULL, PA_CONTEXT_NOFLAGS, NULL);
if (ret < 0) {
pa_context_unref(pa_ctx);
pa_mainloop_free(pa_ml);
return 2;
}
pa_context_set_state_callback(pa_ctx, pa_state_cb, &pa_ready);
// Wait until the pa server is ready
while (pa_ready == 0) {
pa_mainloop_iterate(pa_ml, 1, NULL);
}
// Check if there was an error connecting to the pa server
if (pa_ready == 2) {
pa_context_disconnect(pa_ctx);
pa_context_unref(pa_ctx);
pa_mainloop_free(pa_ml);
return 2;
}
// Get the default output device name
pa_op = pa_context_get_server_info(pa_ctx, &server_info_cb, (void *)default_output);
if (pa_op) {
while (pa_operation_get_state(pa_op) == PA_OPERATION_RUNNING) {
ret = pa_mainloop_iterate(pa_ml, 1, NULL);
if (ret < 0) {
ERR_PRINT("pa_mainloop_iterate error");
}
}
pa_operation_unref(pa_op);
// Now using the device name get the amount of channels
pa_op = pa_context_get_sink_info_by_name(pa_ctx, default_output, &sink_info_cb, (void *)&channels);
if (pa_op) {
while (pa_operation_get_state(pa_op) == PA_OPERATION_RUNNING) {
ret = pa_mainloop_iterate(pa_ml, 1, NULL);
if (ret < 0) {
ERR_PRINT("pa_mainloop_iterate error");
}
}
pa_operation_unref(pa_op);
} else {
ERR_PRINT("pa_context_get_sink_info_by_name error");
}
} else {
ERR_PRINT("pa_context_get_server_info error");
}
pa_context_disconnect(pa_ctx);
pa_context_unref(pa_ctx);
pa_mainloop_free(pa_ml);
return channels;
}
Error AudioDriverPulseAudio::init() {
active = false;
thread_exited = false;
exit_thread = false;
mix_rate = GLOBAL_DEF("audio/mix_rate", DEFAULT_MIX_RATE);
channels = detect_channels();
switch (channels) {
case 2: // Stereo
case 4: // Surround 3.1
case 6: // Surround 5.1
case 8: // Surround 7.1
break;
default:
ERR_PRINTS("PulseAudio: Unsupported number of channels: " + itos(channels));
ERR_FAIL_V(ERR_CANT_OPEN);
break;
}
pa_sample_spec spec;
spec.format = PA_SAMPLE_S16LE;
spec.channels = 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;
if (OS::get_singleton()->is_stdout_verbose()) {
print_line("PulseAudio: detected " + itos(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);
// set them to be automatically chosen
attr.prebuf = (uint32_t)-1;
attr.maxlength = (uint32_t)-1;
attr.minreq = (uint32_t)-1;
int error_code;
pulse = pa_simple_new(NULL, // default server
"Godot", // application name
PA_STREAM_PLAYBACK,
NULL, // default device
"Sound", // stream description
&spec,
NULL, // use default channel map
&attr, // use buffering attributes from above
&error_code);
if (pulse == NULL) {
fprintf(stderr, "PulseAudio ERR: %s\n", pa_strerror(error_code));
ERR_FAIL_COND_V(pulse == NULL, ERR_CANT_OPEN);
}
samples_in.resize(buffer_size);
samples_out.resize(buffer_size);
mutex = Mutex::create();
thread = Thread::create(AudioDriverPulseAudio::thread_func, this);
return OK;
}
float AudioDriverPulseAudio::get_latency() {
if (latency == 0) { //only do this once since it's approximate anyway
int error_code;
pa_usec_t palat = pa_simple_get_latency(pulse, &error_code);
latency = double(palat) / 1000000.0;
}
return latency;
}
void AudioDriverPulseAudio::thread_func(void *p_udata) {
AudioDriverPulseAudio *ad = (AudioDriverPulseAudio *)p_udata;
while (!ad->exit_thread) {
if (!ad->active) {
for (unsigned int i = 0; i < ad->buffer_size; i++) {
ad->samples_out[i] = 0;
}
} else {
ad->lock();
ad->audio_server_process(ad->buffer_frames, ad->samples_in.ptr());
ad->unlock();
for (unsigned int i = 0; i < ad->buffer_size; i++) {
ad->samples_out[i] = ad->samples_in[i] >> 16;
}
}
// pa_simple_write always consumes the entire buffer
int error_code;
int byte_size = ad->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));
ad->active = false;
ad->exit_thread = true;
break;
}
}
ad->thread_exited = true;
}
void AudioDriverPulseAudio::start() {
active = true;
}
int AudioDriverPulseAudio::get_mix_rate() const {
return mix_rate;
}
AudioDriver::SpeakerMode AudioDriverPulseAudio::get_speaker_mode() const {
return get_speaker_mode_by_total_channels(channels);
}
void AudioDriverPulseAudio::lock() {
if (!thread || !mutex)
return;
mutex->lock();
}
void AudioDriverPulseAudio::unlock() {
if (!thread || !mutex)
return;
mutex->unlock();
}
void AudioDriverPulseAudio::finish() {
if (!thread)
return;
exit_thread = true;
Thread::wait_to_finish(thread);
if (pulse) {
pa_simple_free(pulse);
pulse = NULL;
}
memdelete(thread);
if (mutex) {
memdelete(mutex);
mutex = NULL;
}
thread = NULL;
}
AudioDriverPulseAudio::AudioDriverPulseAudio() {
mutex = NULL;
thread = NULL;
pulse = NULL;
samples_in.clear();
samples_out.clear();
mix_rate = 0;
buffer_size = 0;
channels = 0;
active = false;
thread_exited = false;
exit_thread = false;
latency = 0;
buffer_frames = 0;
buffer_size = 0;
channels = 0;
}
AudioDriverPulseAudio::~AudioDriverPulseAudio() {
}
#endif