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// Copyright 2023 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <utility>
#include <vector>
#include <AL/al.h>
#include <AL/alc.h>
#include "audio_core/input.h"
#include "audio_core/openal_input.h"
#include "audio_core/sink.h"
#include "common/logging/log.h"
namespace AudioCore {
struct OpenALInput::Impl {
ALCdevice* device = nullptr;
u8 sample_size_in_bytes = 0;
};
OpenALInput::OpenALInput(std::string device_id)
: impl(std::make_unique<Impl>()), device_id(std::move(device_id)) {}
OpenALInput::~OpenALInput() {
StopSampling();
}
void OpenALInput::StartSampling(const InputParameters& params) {
if (IsSampling()) {
return;
}
// OpenAL supports unsigned 8-bit and signed 16-bit PCM.
// TODO: Re-sample the stream.
if ((params.sample_size == 8 && params.sign == Signedness::Signed) ||
(params.sample_size == 16 && params.sign == Signedness::Unsigned)) {
LOG_WARNING(Audio, "Application requested unsupported unsigned PCM format. Falling back to "
"supported format.");
}
parameters = params;
impl->sample_size_in_bytes = params.sample_size / 8;
auto format = params.sample_size == 16 ? AL_FORMAT_MONO16 : AL_FORMAT_MONO8;
impl->device = alcCaptureOpenDevice(
device_id != auto_device_name && !device_id.empty() ? device_id.c_str() : nullptr,
params.sample_rate, format, static_cast<ALsizei>(params.buffer_size));
auto open_error = alcGetError(impl->device);
if (impl->device == nullptr || open_error != ALC_NO_ERROR) {
LOG_CRITICAL(Audio, "alcCaptureOpenDevice failed: {}", open_error);
StopSampling();
return;
}
alcCaptureStart(impl->device);
auto capture_error = alcGetError(impl->device);
if (capture_error != ALC_NO_ERROR) {
LOG_CRITICAL(Audio, "alcCaptureStart failed: {}", capture_error);
StopSampling();
return;
}
}
void OpenALInput::StopSampling() {
if (impl->device) {
alcCaptureStop(impl->device);
alcCaptureCloseDevice(impl->device);
impl->device = nullptr;
}
}
bool OpenALInput::IsSampling() {
return impl->device != nullptr;
}
void OpenALInput::AdjustSampleRate(u32 sample_rate) {
if (!IsSampling()) {
return;
}
auto new_params = parameters;
new_params.sample_rate = sample_rate;
StopSampling();
StartSampling(new_params);
}
Samples OpenALInput::Read() {
if (!IsSampling()) {
return {};
}
ALCint samples_captured = 0;
alcGetIntegerv(impl->device, ALC_CAPTURE_SAMPLES, 1, &samples_captured);
auto error = alcGetError(impl->device);
if (error != ALC_NO_ERROR) {
LOG_WARNING(Audio, "alcGetIntegerv(ALC_CAPTURE_SAMPLES) failed: {}", error);
return {};
}
auto num_samples = std::min(samples_captured, static_cast<ALsizei>(parameters.buffer_size /
impl->sample_size_in_bytes));
Samples samples(num_samples * impl->sample_size_in_bytes);
alcCaptureSamples(impl->device, samples.data(), num_samples);
error = alcGetError(impl->device);
if (error != ALC_NO_ERROR) {
LOG_WARNING(Audio, "alcCaptureSamples failed: {}", error);
return {};
}
return samples;
}
std::vector<std::string> ListOpenALInputDevices() {
const char* devices_str;
if (alcIsExtensionPresent(nullptr, "ALC_ENUMERATION_EXT") != AL_FALSE) {
devices_str = alcGetString(nullptr, ALC_CAPTURE_DEVICE_SPECIFIER);
} else {
LOG_WARNING(
Audio,
"Missing OpenAL device enumeration extensions, cannot list audio capture devices.");
return {};
}
if (!devices_str || *devices_str == '\0') {
return {};
}
std::vector<std::string> device_list;
while (*devices_str != '\0') {
device_list.emplace_back(devices_str);
devices_str += strlen(devices_str) + 1;
}
return device_list;
}
} // namespace AudioCore
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