437 lines
12 KiB
C++
437 lines
12 KiB
C++
#include "audio_engine.h"
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#include <string.h>
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#include <mutex>
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#include <SDL.h>
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namespace fallout {
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#define AUDIO_ENGINE_SOUND_BUFFERS 8
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struct AudioEngineSoundBuffer {
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bool active;
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unsigned int size;
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int bitsPerSample;
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int channels;
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int rate;
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void* data;
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int volume;
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bool playing;
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bool looping;
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unsigned int pos;
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SDL_AudioStream* stream;
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std::recursive_mutex mutex;
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};
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extern bool gProgramIsActive;
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static bool soundBufferIsValid(int soundBufferIndex);
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static void audioEngineMixin(void* userData, Uint8* stream, int length);
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static SDL_AudioSpec gAudioEngineSpec;
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static SDL_AudioDeviceID gAudioEngineDeviceId = -1;
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static AudioEngineSoundBuffer gAudioEngineSoundBuffers[AUDIO_ENGINE_SOUND_BUFFERS];
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static bool soundBufferIsValid(int soundBufferIndex)
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{
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return soundBufferIndex >= 0 && soundBufferIndex < AUDIO_ENGINE_SOUND_BUFFERS;
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}
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static void audioEngineMixin(void* userData, Uint8* stream, int length)
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{
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memset(stream, gAudioEngineSpec.silence, length);
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if (!gProgramIsActive) {
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return;
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}
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for (int index = 0; index < AUDIO_ENGINE_SOUND_BUFFERS; index++) {
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[index]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (soundBuffer->active && soundBuffer->playing) {
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int srcFrameSize = soundBuffer->bitsPerSample / 8 * soundBuffer->channels;
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unsigned char buffer[1024];
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int pos = 0;
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while (pos < length) {
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int remaining = length - pos;
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if (remaining > sizeof(buffer)) {
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remaining = sizeof(buffer);
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}
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// TODO: Make something better than frame-by-frame convertion.
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SDL_AudioStreamPut(soundBuffer->stream, (unsigned char*)soundBuffer->data + soundBuffer->pos, srcFrameSize);
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soundBuffer->pos += srcFrameSize;
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int bytesRead = SDL_AudioStreamGet(soundBuffer->stream, buffer, remaining);
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if (bytesRead == -1) {
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break;
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}
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SDL_MixAudioFormat(stream + pos, buffer, gAudioEngineSpec.format, bytesRead, soundBuffer->volume);
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if (soundBuffer->pos >= soundBuffer->size) {
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if (soundBuffer->looping) {
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soundBuffer->pos %= soundBuffer->size;
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} else {
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soundBuffer->playing = false;
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break;
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}
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}
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pos += bytesRead;
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}
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}
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}
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}
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bool audioEngineInit()
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{
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if (SDL_InitSubSystem(SDL_INIT_AUDIO) == -1) {
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return false;
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}
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SDL_AudioSpec desiredSpec;
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desiredSpec.freq = 22050;
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desiredSpec.format = AUDIO_S16;
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desiredSpec.channels = 2;
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desiredSpec.samples = 1024;
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desiredSpec.callback = audioEngineMixin;
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gAudioEngineDeviceId = SDL_OpenAudioDevice(NULL, 0, &desiredSpec, &gAudioEngineSpec, SDL_AUDIO_ALLOW_ANY_CHANGE);
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if (gAudioEngineDeviceId == -1) {
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return false;
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}
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SDL_PauseAudioDevice(gAudioEngineDeviceId, 0);
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return true;
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}
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void audioEngineExit()
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{
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if (gAudioEngineDeviceId != -1) {
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SDL_CloseAudioDevice(gAudioEngineDeviceId);
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gAudioEngineDeviceId = -1;
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}
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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}
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void audioEnginePause()
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{
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if (gAudioEngineDeviceId != -1) {
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SDL_PauseAudioDevice(gAudioEngineDeviceId, 1);
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}
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}
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void audioEngineResume()
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{
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if (gAudioEngineDeviceId != -1) {
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SDL_PauseAudioDevice(gAudioEngineDeviceId, 0);
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}
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}
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int audioEngineCreateSoundBuffer(unsigned int size, int bitsPerSample, int channels, int rate)
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{
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for (int index = 0; index < AUDIO_ENGINE_SOUND_BUFFERS; index++) {
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[index]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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soundBuffer->active = true;
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soundBuffer->size = size;
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soundBuffer->bitsPerSample = bitsPerSample;
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soundBuffer->channels = channels;
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soundBuffer->rate = rate;
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soundBuffer->volume = SDL_MIX_MAXVOLUME;
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soundBuffer->playing = false;
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soundBuffer->looping = false;
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soundBuffer->pos = 0;
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soundBuffer->data = malloc(size);
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soundBuffer->stream = SDL_NewAudioStream(bitsPerSample == 16 ? AUDIO_S16 : AUDIO_S8, channels, rate, gAudioEngineSpec.format, gAudioEngineSpec.channels, gAudioEngineSpec.freq);
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return index;
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}
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}
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return -1;
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}
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bool audioEngineSoundBufferRelease(int soundBufferIndex)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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soundBuffer->active = false;
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free(soundBuffer->data);
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soundBuffer->data = NULL;
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SDL_FreeAudioStream(soundBuffer->stream);
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soundBuffer->stream = NULL;
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return true;
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}
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bool audioEngineSoundBufferSetVolume(int soundBufferIndex, int volume)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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soundBuffer->volume = volume;
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return true;
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}
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bool audioEngineSoundBufferGetVolume(int soundBufferIndex, int* volumePtr)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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*volumePtr = soundBuffer->volume;
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return true;
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}
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bool audioEngineSoundBufferSetPan(int soundBufferIndex, int pan)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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// NOTE: Audio engine does not support sound panning. I'm not sure it's
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// even needed. For now this value is silently ignored.
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return true;
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}
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bool audioEngineSoundBufferPlay(int soundBufferIndex, unsigned int flags)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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soundBuffer->playing = true;
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if ((flags & AUDIO_ENGINE_SOUND_BUFFER_PLAY_LOOPING) != 0) {
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soundBuffer->looping = true;
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}
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return true;
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}
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bool audioEngineSoundBufferStop(int soundBufferIndex)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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soundBuffer->playing = false;
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return true;
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}
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bool audioEngineSoundBufferGetCurrentPosition(int soundBufferIndex, unsigned int* readPosPtr, unsigned int* writePosPtr)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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if (readPosPtr != NULL) {
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*readPosPtr = soundBuffer->pos;
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}
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if (writePosPtr != NULL) {
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*writePosPtr = soundBuffer->pos;
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if (soundBuffer->playing) {
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// 15 ms lead
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// See: https://docs.microsoft.com/en-us/previous-versions/windows/desktop/mt708925(v=vs.85)#remarks
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*writePosPtr += soundBuffer->rate / 150;
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*writePosPtr %= soundBuffer->size;
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}
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}
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return true;
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}
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bool audioEngineSoundBufferSetCurrentPosition(int soundBufferIndex, unsigned int pos)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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soundBuffer->pos = pos % soundBuffer->size;
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return true;
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}
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bool audioEngineSoundBufferLock(int soundBufferIndex, unsigned int writePos, unsigned int writeBytes, void** audioPtr1, unsigned int* audioBytes1, void** audioPtr2, unsigned int* audioBytes2, unsigned int flags)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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if (audioBytes1 == NULL) {
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return false;
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}
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if ((flags & AUDIO_ENGINE_SOUND_BUFFER_LOCK_FROM_WRITE_POS) != 0) {
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if (!audioEngineSoundBufferGetCurrentPosition(soundBufferIndex, NULL, &writePos)) {
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return false;
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}
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}
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if ((flags & AUDIO_ENGINE_SOUND_BUFFER_LOCK_ENTIRE_BUFFER) != 0) {
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writeBytes = soundBuffer->size;
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}
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if (writePos + writeBytes <= soundBuffer->size) {
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*(unsigned char**)audioPtr1 = (unsigned char*)soundBuffer->data + writePos;
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*audioBytes1 = writeBytes;
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if (audioPtr2 != NULL) {
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*audioPtr2 = NULL;
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}
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if (audioBytes2 != NULL) {
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*audioBytes2 = 0;
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}
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} else {
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unsigned int remainder = writePos + writeBytes - soundBuffer->size;
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*(unsigned char**)audioPtr1 = (unsigned char*)soundBuffer->data + writePos;
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*audioBytes1 = soundBuffer->size - writePos;
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if (audioPtr2 != NULL) {
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*(unsigned char**)audioPtr2 = (unsigned char*)soundBuffer->data;
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}
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if (audioBytes2 != NULL) {
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*audioBytes2 = writeBytes - (soundBuffer->size - writePos);
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}
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}
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// TODO: Mark range as locked.
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return true;
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}
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bool audioEngineSoundBufferUnlock(int soundBufferIndex, void* audioPtr1, unsigned int audioBytes1, void* audioPtr2, unsigned int audioBytes2)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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// TODO: Mark range as unlocked.
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return true;
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}
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bool audioEngineSoundBufferGetStatus(int soundBufferIndex, unsigned int* statusPtr)
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{
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if (!soundBufferIsValid(soundBufferIndex)) {
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return false;
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}
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AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[soundBufferIndex]);
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std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
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if (!soundBuffer->active) {
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return false;
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}
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if (statusPtr == NULL) {
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return false;
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}
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*statusPtr = 0;
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if (soundBuffer->playing) {
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*statusPtr |= AUDIO_ENGINE_SOUND_BUFFER_STATUS_PLAYING;
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if (soundBuffer->looping) {
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*statusPtr |= AUDIO_ENGINE_SOUND_BUFFER_STATUS_LOOPING;
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}
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}
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return true;
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}
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} // namespace fallout
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