110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
/*****************************************************************************\
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Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
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This file is licensed under the Snes9x License.
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For further information, consult the LICENSE file in the root directory.
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\*****************************************************************************/
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#include "s9x_sound_driver_sdl.hpp"
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#include "SDL_audio.h"
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bool S9xSDLSoundDriver::write_samples(int16_t *data, int samples)
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{
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bool retval = true;
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auto empty = buffer.space_empty();
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if (samples > empty)
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{
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retval = false;
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buffer.dump(buffer.buffer_size / 2 - empty);
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}
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buffer.push(data, samples);
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return retval;
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}
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void S9xSDLSoundDriver::mix(unsigned char *output, int bytes)
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{
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if (buffer.avail() >= bytes >> 1)
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buffer.read((int16_t *)output, bytes >> 1);
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else
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{
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buffer.read((int16_t *)output, buffer.avail());
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buffer.add_silence(buffer.buffer_size / 2);
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}
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}
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S9xSDLSoundDriver::S9xSDLSoundDriver()
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{
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}
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S9xSDLSoundDriver::~S9xSDLSoundDriver()
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{
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deinit();
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}
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void S9xSDLSoundDriver::init()
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{
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SDL_InitSubSystem(SDL_INIT_AUDIO);
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stop();
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}
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void S9xSDLSoundDriver::deinit()
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{
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stop();
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SDL_CloseAudio();
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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}
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void S9xSDLSoundDriver::start()
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{
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SDL_PauseAudio(0);
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}
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void S9xSDLSoundDriver::stop()
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{
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SDL_PauseAudio(1);
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}
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bool S9xSDLSoundDriver::open_device(int playback_rate, int buffer_size)
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{
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audiospec = {};
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audiospec.freq = playback_rate;
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audiospec.channels = 2;
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audiospec.format = AUDIO_S16SYS;
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audiospec.samples = audiospec.freq * buffer_size / 8 / 1000; // 1/8th buffer per callback
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audiospec.callback = [](void *userdata, uint8_t *stream, int len) {
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((S9xSDLSoundDriver *)userdata)->mix((unsigned char *)stream, len);
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};
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audiospec.userdata = this;
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printf("SDL sound driver initializing...\n");
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printf(" --> (Frequency: %dhz, Latency: %dms)...",
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audiospec.freq,
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(audiospec.samples * 1000 / audiospec.freq));
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if (SDL_OpenAudio(&audiospec, NULL) < 0)
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{
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printf("Failed\n");
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return false;
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}
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printf("OK\n");
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if (buffer_size < 32)
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buffer_size = 32;
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buffer.resize(buffer_size * 4 * audiospec.freq / 1000);
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return true;
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}
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int S9xSDLSoundDriver::space_free()
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{
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auto space_empty = buffer.space_empty();
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return space_empty;
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}
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std::pair<int, int> S9xSDLSoundDriver::buffer_level()
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{
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std::pair<int, int> level = { buffer.space_empty(), buffer.buffer_size };
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return level;
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} |