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Add notes for FAudio implementation

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This commit is contained in:
Ethan Lee 2022-01-14 17:11:16 -05:00
parent 5202b80a3d
commit adcabb9483
1 changed files with 18 additions and 0 deletions
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18
desktop_version/src/Music.cpp
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@ -25,6 +25,7 @@ class MusicTrack
public:
MusicTrack(SDL_RWops *rw)
{
/* Open an stb_vorbis handle */
m_music = Mix_LoadMUS_RW(rw, 1);
if (m_music == NULL)
{
@ -34,11 +35,13 @@ public:
void Dispose()
{
/* Free stb_vorbis */
Mix_FreeMusic(m_music);
}
bool Play(bool loop)
{
/* Create/Validate static FAudioSourceVoice, begin streaming */
if (Mix_PlayMusic(m_music, loop ? -1 : 0) == -1)
{
vlog_error("Mix_PlayMusic: %s", Mix_GetError());
@ -49,26 +52,31 @@ public:
static void Halt()
{
/* FAudioVoice_Destroy */
Mix_HaltMusic();
}
static bool IsHalted()
{
/* return musicVoice == NULL; */
return Mix_PausedMusic() == 1;
}
static void Pause()
{
/* FAudioSourceVoice_Pause */
Mix_PauseMusic();
}
static void Resume()
{
/* FAudioSourceVoice_Resume */
Mix_ResumeMusic();
}
static void SetVolume(int musicVolume)
{
/* FAudioSourceVoice_SetVolume */
Mix_VolumeMusic(musicVolume);
}
@ -81,6 +89,7 @@ class SoundTrack
public:
SoundTrack(const char* fileName)
{
/* Parse WAV header, fill in FAudioBuffer, read PCM to malloc buffer */
unsigned char *mem;
size_t length;
FILESYSTEM_loadAssetToMemory(fileName, &mem, &length, false);
@ -103,11 +112,13 @@ public:
void Dispose()
{
/* Destroy all source voices, free buffer used by FAudioBuffer */
Mix_FreeChunk(m_sound);
}
void Play()
{
/* Fire-and-forget from a per-track FAudioSourceVoice pool */
if (Mix_PlayChannel(-1, m_sound, 0) == -1)
{
vlog_error("Unable to play WAV file: %s", Mix_GetError());
@ -119,6 +130,7 @@ public:
const Uint16 audio_format = AUDIO_S16SYS;
const int audio_buffers = 1024;
/* FAudioCreate, FAudio_CreateMasteringVoice */
if (Mix_OpenAudio(audio_rate, audio_format, audio_channels, audio_buffers) != 0)
{
vlog_error("Unable to initialize audio: %s", Mix_GetError());
@ -128,16 +140,22 @@ public:
static void Pause()
{
/* FAudio_StopEngine */
Mix_Pause(-1);
}
static void Resume()
{
/* FAudio_StartEngine */
Mix_Resume(-1);
}
static void SetVolume(int soundVolume)
{
/* FAudioVoice_SetVolume on all sounds. Yeah, all of them :/
* If we get desperate we can use a submix and set volume on that, but
* the submix is an extra mix stage so just loop all sounds manually...
*/
Mix_Volume(-1, soundVolume);
}