98 lines
2.3 KiB
C++
98 lines
2.3 KiB
C++
#include <psemek/audio/engine.hpp>
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#include <psemek/audio/constants.hpp>
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#include <psemek/sdl2/init.hpp>
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#include <psemek/log/log.hpp>
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#include <psemek/prof/profiler.hpp>
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#include <psemek/util/at_scope_exit.hpp>
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#include <psemek/util/to_string.hpp>
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#include <SDL2/SDL.h>
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#include <mutex>
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#include <atomic>
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#include <vector>
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#include <optional>
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#include <cmath>
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namespace psemek::audio
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{
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struct engine::impl
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{
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std::shared_ptr<void> sdl_init;
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SDL_AudioDeviceID device;
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std::vector<float> buffer;
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bool thread_registered = false;
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channel_ptr output;
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impl();
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~impl();
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static void callback(void * userdata, std::uint8_t * stream, int len);
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};
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engine::impl::impl()
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: sdl_init(sdl2::init(SDL_INIT_AUDIO))
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{
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SDL_AudioSpec desired, obtained;
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desired.freq = frequency;
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desired.channels = 2;
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desired.format = AUDIO_S16SYS;
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desired.samples = 256;
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desired.callback = &callback;
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desired.userdata = this;
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if (device = SDL_OpenAudioDevice(nullptr, 0, &desired, &obtained, 0); device == 0)
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sdl2::fail("SDL_OpenAudioDevice failed:");
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log::info() << "Initialized audio: " << static_cast<int>(obtained.channels) << " channels, " << obtained.freq << " Hz, " << obtained.samples << " samples";
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buffer.resize(obtained.samples * obtained.channels);
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output = std::make_shared<channel>();
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SDL_PauseAudioDevice(device, 0);
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}
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engine::impl::~impl()
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{
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SDL_CloseAudioDevice(device);
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}
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void engine::impl::callback(void * userdata, std::uint8_t * dst_u8, int len)
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{
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static std::string const profiler_str = "audio";
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prof::profiler prof(profiler_str);
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auto self = static_cast<impl *>(userdata);
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stream_ptr output = self->output->stream();
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std::int16_t * dst = reinterpret_cast<std::int16_t *>(dst_u8);
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if (!self->thread_registered)
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{
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log::register_thread("audio");
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self->thread_registered = true;
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}
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std::size_t const size = len / 2;
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std::size_t read = 0;
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if (output)
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read = output->read(self->buffer.data(), size);
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std::fill(self->buffer.data() + read, self->buffer.data() + size, 0.f);
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for (auto s : self->buffer)
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*dst++ = static_cast<std::int16_t>(std::max(std::min((65535.f * s - 1.f) / 2.f, 32767.f), -32768.f));
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}
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engine::engine()
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: pimpl_(make_impl())
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{}
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engine::~engine() = default;
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channel_ptr engine::output()
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{
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return impl().output;
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}
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}
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