Add an SDL 1.2 audio backend
This commit is contained in:
Cameron Cawley
parent
72a5f36654
commit
9b81f45381
2 changed files with 255 additions and 2 deletions
|
|
@ -25,7 +25,7 @@ option(LANCZOS_RESAMPLER "Use Lanczos filtering for audio resampling instead of
|
|||
option(FREETYPE_FONTS "Use FreeType2 to render the DejaVu Mono (English) or Migu1M (Japanese) fonts, instead of using pre-rendered copies of Courier New (English) and MS Gothic (Japanese)" OFF)
|
||||
|
||||
set(BACKEND_RENDERER "SDLTexture" CACHE STRING "Which renderer the game should use: 'OpenGL3' for an OpenGL 3.2 renderer, 'OpenGLES2' for an OpenGL ES 2.0 renderer, 'SDLTexture' for SDL2's hardware-accelerated Texture API, 'SDLSurface' for SDL2's software-rendered Surface API, 'Wii U' for the Wii U's hardware-accelerated GX2 API, '3DS' for the 3DS's hardware accelerated Citro2D/Citro3D API, or 'Software' for a handwritten software renderer")
|
||||
set(BACKEND_AUDIO "SDL2" CACHE STRING "Which audio backend the game should use: 'SDL2', 'miniaudio', 'WiiU-Hardware', 'WiiU-Software', '3DS-Hardware', '3DS-Software', or 'Null'")
|
||||
set(BACKEND_AUDIO "SDL2" CACHE STRING "Which audio backend the game should use: 'SDL2', 'SDL1', 'miniaudio', 'WiiU-Hardware', 'WiiU-Software', '3DS-Hardware', '3DS-Software', or 'Null'")
|
||||
set(BACKEND_PLATFORM "SDL2" CACHE STRING "Which platform backend the game should use: 'SDL2', 'SDL1', 'GLFW3', 'WiiU', '3DS', or 'Null'")
|
||||
|
||||
option(LTO "Enable link-time optimisation" OFF)
|
||||
|
|
@ -336,6 +336,12 @@ if(BACKEND_AUDIO MATCHES "SDL2")
|
|||
"src/Backends/Audio/SoftwareMixer/Backend.h"
|
||||
"src/Backends/Audio/SoftwareMixer/SDL2.cpp"
|
||||
)
|
||||
elseif(BACKEND_AUDIO MATCHES "SDL1")
|
||||
target_sources(CSE2 PRIVATE
|
||||
"src/Backends/Audio/SDL1.cpp"
|
||||
"src/Backends/Audio/SoftwareMixer.cpp"
|
||||
"src/Backends/Audio/SoftwareMixer.h"
|
||||
)
|
||||
elseif(BACKEND_AUDIO MATCHES "miniaudio")
|
||||
target_sources(CSE2 PRIVATE
|
||||
"src/Backends/Audio/SoftwareMixer.cpp"
|
||||
|
|
@ -607,7 +613,11 @@ if(BACKEND_PLATFORM MATCHES "SDL2" OR BACKEND_AUDIO MATCHES "SDL2")
|
|||
endif()
|
||||
endif()
|
||||
|
||||
if(BACKEND_PLATFORM MATCHES "SDL1")
|
||||
if(BACKEND_PLATFORM MATCHES "SDL1" OR BACKEND_AUDIO MATCHES "SDL1")
|
||||
if(BACKEND_PLATFORM MATCHES "SDL2" OR BACKEND_AUDIO MATCHES "SDL2")
|
||||
message(FATAL_ERROR "SDL1 and SDL2 cannot be used simultaneously!")
|
||||
endif()
|
||||
|
||||
find_package(SDL 1.2.15)
|
||||
|
||||
if (PKG_CONFIG_FOUND)
|
||||
|
|
|
|||
243
src/Backends/Audio/SDL1.cpp
Normal file
243
src/Backends/Audio/SDL1.cpp
Normal file
|
|
@ -0,0 +1,243 @@
|
|||
#include "../Audio.h"
|
||||
|
||||
#include <stddef.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <string>
|
||||
|
||||
#include "SDL.h"
|
||||
|
||||
#include "../Misc.h"
|
||||
|
||||
#include "SoftwareMixer.h"
|
||||
|
||||
#define MIN(a, b) ((a) < (b) ? (a) : (b))
|
||||
|
||||
static unsigned long output_frequency;
|
||||
|
||||
static void (*organya_callback)(void);
|
||||
static unsigned int organya_callback_milliseconds;
|
||||
|
||||
static void MixSoundsAndUpdateOrganya(long *stream, size_t frames_total)
|
||||
{
|
||||
if (organya_callback_milliseconds == 0)
|
||||
{
|
||||
Mixer_MixSounds(stream, frames_total);
|
||||
}
|
||||
else
|
||||
{
|
||||
// Synchronise audio generation with Organya.
|
||||
// In the original game, Organya ran asynchronously in a separate thread,
|
||||
// firing off commands to DirectSound in realtime. To match that, we'd
|
||||
// need a very low-latency buffer, otherwise we'd get mistimed instruments.
|
||||
// Instead, we can just do this.
|
||||
unsigned int frames_done = 0;
|
||||
|
||||
while (frames_done != frames_total)
|
||||
{
|
||||
static unsigned long organya_countdown;
|
||||
|
||||
if (organya_countdown == 0)
|
||||
{
|
||||
organya_countdown = (organya_callback_milliseconds * output_frequency) / 1000; // organya_timer is in milliseconds, so convert it to audio frames
|
||||
organya_callback();
|
||||
}
|
||||
|
||||
const unsigned int frames_to_do = MIN(organya_countdown, frames_total - frames_done);
|
||||
|
||||
Mixer_MixSounds(stream + frames_done * 2, frames_to_do);
|
||||
|
||||
frames_done += frames_to_do;
|
||||
organya_countdown -= frames_to_do;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void Callback(void *user_data, Uint8 *stream_uint8, int len)
|
||||
{
|
||||
(void)user_data;
|
||||
|
||||
short *stream = (short*)stream_uint8;
|
||||
const size_t frames_total = len / sizeof(short) / 2;
|
||||
|
||||
size_t frames_done = 0;
|
||||
|
||||
while (frames_done != frames_total)
|
||||
{
|
||||
long mix_buffer[0x800 * 2]; // 2 because stereo
|
||||
|
||||
size_t subframes = MIN(0x800, frames_total - frames_done);
|
||||
|
||||
memset(mix_buffer, 0, subframes * sizeof(long) * 2);
|
||||
|
||||
MixSoundsAndUpdateOrganya(mix_buffer, subframes);
|
||||
|
||||
for (size_t i = 0; i < subframes * 2; ++i)
|
||||
{
|
||||
if (mix_buffer[i] > 0x7FFF)
|
||||
*stream++ = 0x7FFF;
|
||||
else if (mix_buffer[i] < -0x7FFF)
|
||||
*stream++ = -0x7FFF;
|
||||
else
|
||||
*stream++ = mix_buffer[i];
|
||||
}
|
||||
|
||||
frames_done += subframes;
|
||||
}
|
||||
}
|
||||
|
||||
bool AudioBackend_Init(void)
|
||||
{
|
||||
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0)
|
||||
{
|
||||
std::string errorMessage = std::string("'SDL_InitSubSystem(SDL_INIT_AUDIO)' failed: ") + SDL_GetError();
|
||||
Backend_ShowMessageBox("Fatal error (SDL1 audio backend)", errorMessage.c_str());
|
||||
return false;
|
||||
}
|
||||
|
||||
SDL_AudioSpec specification;
|
||||
specification.freq = 48000;
|
||||
specification.format = AUDIO_S16;
|
||||
specification.channels = 2;
|
||||
specification.samples = 0x400; // Roughly 10 milliseconds for 48000Hz
|
||||
specification.callback = Callback;
|
||||
specification.userdata = NULL;
|
||||
|
||||
SDL_AudioSpec obtained_specification;
|
||||
if (SDL_OpenAudio(&specification, &obtained_specification) != 0)
|
||||
{
|
||||
std::string error_message = std::string("'SDL_OpenAudio' failed: ") + SDL_GetError();
|
||||
Backend_ShowMessageBox("Fatal error (SDL1 audio backend)", error_message.c_str());
|
||||
return false;
|
||||
}
|
||||
|
||||
output_frequency = obtained_specification.freq;
|
||||
Mixer_Init(obtained_specification.freq);
|
||||
|
||||
SDL_PauseAudio(0);
|
||||
|
||||
char driver[20];
|
||||
Backend_PrintInfo("Selected SDL audio driver: %s", SDL_AudioDriverName(driver, 20));
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
void AudioBackend_Deinit(void)
|
||||
{
|
||||
SDL_CloseAudio();
|
||||
|
||||
SDL_QuitSubSystem(SDL_INIT_AUDIO);
|
||||
}
|
||||
|
||||
AudioBackend_Sound* AudioBackend_CreateSound(unsigned int frequency, const unsigned char *samples, size_t length)
|
||||
{
|
||||
SDL_LockAudio();
|
||||
|
||||
Mixer_Sound *sound = Mixer_CreateSound(frequency, samples, length);
|
||||
|
||||
SDL_UnlockAudio();
|
||||
|
||||
return (AudioBackend_Sound*)sound;
|
||||
}
|
||||
|
||||
void AudioBackend_DestroySound(AudioBackend_Sound *sound)
|
||||
{
|
||||
if (sound == NULL)
|
||||
return;
|
||||
|
||||
SDL_LockAudio();
|
||||
|
||||
Mixer_DestroySound((Mixer_Sound*)sound);
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
|
||||
void AudioBackend_PlaySound(AudioBackend_Sound *sound, bool looping)
|
||||
{
|
||||
if (sound == NULL)
|
||||
return;
|
||||
|
||||
SDL_LockAudio();
|
||||
|
||||
Mixer_PlaySound((Mixer_Sound*)sound, looping);
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
|
||||
void AudioBackend_StopSound(AudioBackend_Sound *sound)
|
||||
{
|
||||
if (sound == NULL)
|
||||
return;
|
||||
|
||||
SDL_LockAudio();
|
||||
|
||||
Mixer_StopSound((Mixer_Sound*)sound);
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
|
||||
void AudioBackend_RewindSound(AudioBackend_Sound *sound)
|
||||
{
|
||||
if (sound == NULL)
|
||||
return;
|
||||
|
||||
SDL_LockAudio();
|
||||
|
||||
Mixer_RewindSound((Mixer_Sound*)sound);
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
|
||||
void AudioBackend_SetSoundFrequency(AudioBackend_Sound *sound, unsigned int frequency)
|
||||
{
|
||||
if (sound == NULL)
|
||||
return;
|
||||
|
||||
SDL_LockAudio();
|
||||
|
||||
Mixer_SetSoundFrequency((Mixer_Sound*)sound, frequency);
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
|
||||
void AudioBackend_SetSoundVolume(AudioBackend_Sound *sound, long volume)
|
||||
{
|
||||
if (sound == NULL)
|
||||
return;
|
||||
|
||||
SDL_LockAudio();
|
||||
|
||||
Mixer_SetSoundVolume((Mixer_Sound*)sound, volume);
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
|
||||
void AudioBackend_SetSoundPan(AudioBackend_Sound *sound, long pan)
|
||||
{
|
||||
if (sound == NULL)
|
||||
return;
|
||||
|
||||
SDL_LockAudio();
|
||||
|
||||
Mixer_SetSoundPan((Mixer_Sound*)sound, pan);
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
|
||||
void AudioBackend_SetOrganyaCallback(void (*callback)(void))
|
||||
{
|
||||
SDL_LockAudio();
|
||||
|
||||
organya_callback = callback;
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
|
||||
void AudioBackend_SetOrganyaTimer(unsigned int milliseconds)
|
||||
{
|
||||
SDL_LockAudio();
|
||||
|
||||
organya_callback_milliseconds = milliseconds;
|
||||
|
||||
SDL_UnlockAudio();
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue