ref: 277a0b8e733256edfa746bc8e59eb18232fa49a1
dir: /src/Backends/Audio/WiiU-Software.cpp/
#include "../Audio.h"
#include <math.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <coreinit/cache.h>
#include <coreinit/mutex.h>
#include <coreinit/thread.h>
#include <sndcore2/core.h>
#include <sndcore2/voice.h>
#include <sndcore2/drcvs.h>
#include "SoftwareMixer.h"
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define CLAMP(x, y, z) MIN(MAX((x), (y)), (z))
static void (*organya_callback)(void);
static unsigned int organya_callback_milliseconds;
static OSMutex sound_list_mutex;
static OSMutex organya_mutex;
static AXVoice *voices[2];
static short *stream_buffers[2];
static float *stream_buffer_float;
static size_t buffer_length;
static unsigned long output_frequency;
static void FillMixerBuffer(float *stream, size_t frames_total)
{
OSLockMutex(&organya_mutex);
if (organya_callback_milliseconds == 0)
{
OSLockMutex(&sound_list_mutex);
Mixer_MixSounds(stream, frames_total);
OSUnlockMutex(&sound_list_mutex);
}
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);
OSLockMutex(&sound_list_mutex);
Mixer_MixSounds(stream + frames_done * 2, frames_to_do);
OSUnlockMutex(&sound_list_mutex);
frames_done += frames_to_do;
organya_countdown -= frames_to_do;
}
}
OSUnlockMutex(&organya_mutex);
}
static void FrameCallback(void)
{
// We use a double-buffer: while the Wii U is busy playing one half of the buffer, we update the other.
// The buffer is 10ms long in total, and this function runs every 3ms.
// Just assume both voices are in-sync, and only check the first one
AXVoiceOffsets offsets;
AXGetVoiceOffsets(voices[0], &offsets);
unsigned int current_buffer = offsets.currentOffset > buffer_length ? 1 : 0; // TODO - should probably be '>='
static unsigned int last_buffer = 1;
if (current_buffer != last_buffer)
{
// Clear the mixer buffer
for (unsigned int i = 0; i < buffer_length * 2; ++i)
stream_buffer_float[i] = 0.0f;
// Fill mixer buffer
FillMixerBuffer(stream_buffer_float, buffer_length);
// Deinterlate samples, convert them to S16, and write them to the double-buffers
short *left_output_buffer = &stream_buffers[0][buffer_length * last_buffer];
short *right_output_buffer = &stream_buffers[1][buffer_length * last_buffer];
float *mixer_buffer_pointer = stream_buffer_float;
short *left_output_buffer_pointer = left_output_buffer;
short *right_output_buffer_pointer = right_output_buffer;
for (unsigned int i = 0; i < buffer_length; ++i)
{
float left_sample = *mixer_buffer_pointer++;
float right_sample = *mixer_buffer_pointer++;
// Clamp samples to sane limits
if (left_sample < -1.0f)
left_sample = -1.0f;
else if (left_sample > 1.0f)
left_sample = 1.0f;
if (right_sample < -1.0f)
right_sample = -1.0f;
else if (right_sample > 1.0f)
right_sample = 1.0f;
// Convert to S16 and store in double-buffers
*left_output_buffer_pointer++ = (short)(left_sample * 32767.0f);
*right_output_buffer_pointer++ = (short)(right_sample * 32767.0f);
}
// Make sure the sound hardware can see our data
DCStoreRange(left_output_buffer, buffer_length * sizeof(short));
DCStoreRange(right_output_buffer, buffer_length * sizeof(short));
last_buffer = current_buffer;
}
}
bool AudioBackend_Init(void)
{
if (!AXIsInit())
{
AXInitParams initparams = {
.renderer = AX_INIT_RENDERER_48KHZ,
.pipeline = AX_INIT_PIPELINE_SINGLE,
};
AXInitWithParams(&initparams);
}
OSInitMutex(&sound_list_mutex);
OSInitMutex(&organya_mutex);
output_frequency = AXGetInputSamplesPerSec();
Mixer_Init(output_frequency);
buffer_length = output_frequency / 100; // 10ms buffer
// Create and initialise two 'voices': each one will stream its own
// audio - one for the left speaker, and one for the right.
// The software-mixer outputs interlaced float samples, so create
// a buffer for it here.
stream_buffer_float = (float*)malloc(buffer_length * sizeof(float) * 2); // `* 2` because it's an interlaced stereo buffer
if (stream_buffer_float != NULL)
{
stream_buffers[0] = (short*)malloc(buffer_length * sizeof(short) * 2); // `* 2` because it's a double-buffer
if (stream_buffers[0] != NULL)
{
stream_buffers[1] = (short*)malloc(buffer_length * sizeof(short) * 2); // `* 2` because it's a double-buffer
if (stream_buffers[1] != NULL)
{
voices[0] = AXAcquireVoice(31, NULL, NULL);
if (voices[0] != NULL)
{
voices[1] = AXAcquireVoice(31, NULL, NULL);
if (voices[1] != NULL)
{
for (unsigned int i = 0; i < 2; ++i)
{
AXVoiceBegin(voices[i]);
AXSetVoiceType(voices[i], 0);
AXVoiceVeData vol = {.volume = 0x8000};
AXSetVoiceVe(voices[i], &vol);
AXVoiceDeviceMixData mix_data[6];
memset(mix_data, 0, sizeof(mix_data));
mix_data[0].bus[0].volume = i == 0 ? 0x8000 : 0; // Channel 1 goes on the left speaker
mix_data[1].bus[0].volume = i == 1 ? 0x8000 : 0; // Channel 2 goes on the right speaker
AXSetVoiceDeviceMix(voices[i], AX_DEVICE_TYPE_DRC, 0, mix_data);
AXSetVoiceDeviceMix(voices[i], AX_DEVICE_TYPE_TV, 0, mix_data);
AXSetVoiceSrcRatio(voices[i], 1.0f); // We use the native sample rate
AXSetVoiceSrcType(voices[i], AX_VOICE_SRC_TYPE_NONE);
AXVoiceOffsets offs = {
.dataType = AX_VOICE_FORMAT_LPCM16,
.loopingEnabled = AX_VOICE_LOOP_ENABLED,
.loopOffset = 0,
.endOffset = buffer_length * 2,
.currentOffset = 0,
.data = stream_buffers[i]
};
AXSetVoiceOffsets(voices[i], &offs);
AXSetVoiceState(voices[i], AX_VOICE_STATE_PLAYING);
AXVoiceEnd(voices[i]);
}
// Register the frame callback.
// Apparently, this fires every 3ms - we will use
// it to update the stream buffers when needed.
AXRegisterAppFrameCallback(FrameCallback);
return true;
}
AXFreeVoice(voices[0]);
}
free(stream_buffers[1]);
}
free(stream_buffers[0]);
}
free(stream_buffer_float);
}
return false;
}
void AudioBackend_Deinit(void)
{
for (unsigned int i = 0; i < 2; ++i)
{
AXFreeVoice(voices[i]);
free(stream_buffers[i]);
}
AXQuit();
}
AudioBackend_Sound* AudioBackend_CreateSound(unsigned int frequency, const unsigned char *samples, size_t length)
{
OSLockMutex(&sound_list_mutex);
Mixer_Sound *sound = Mixer_CreateSound(frequency, samples, length);
OSUnlockMutex(&sound_list_mutex);
return (AudioBackend_Sound*)sound;
}
void AudioBackend_DestroySound(AudioBackend_Sound *sound)
{
if (sound == NULL)
return;
OSLockMutex(&sound_list_mutex);
Mixer_DestroySound((Mixer_Sound*)sound);
OSUnlockMutex(&sound_list_mutex);
}
void AudioBackend_PlaySound(AudioBackend_Sound *sound, bool looping)
{
if (sound == NULL)
return;
OSLockMutex(&sound_list_mutex);
Mixer_PlaySound((Mixer_Sound*)sound, looping);
OSUnlockMutex(&sound_list_mutex);
}
void AudioBackend_StopSound(AudioBackend_Sound *sound)
{
if (sound == NULL)
return;
OSLockMutex(&sound_list_mutex);
Mixer_StopSound((Mixer_Sound*)sound);
OSUnlockMutex(&sound_list_mutex);
}
void AudioBackend_RewindSound(AudioBackend_Sound *sound)
{
if (sound == NULL)
return;
OSLockMutex(&sound_list_mutex);
Mixer_RewindSound((Mixer_Sound*)sound);
OSUnlockMutex(&sound_list_mutex);
}
void AudioBackend_SetSoundFrequency(AudioBackend_Sound *sound, unsigned int frequency)
{
if (sound == NULL)
return;
OSLockMutex(&sound_list_mutex);
Mixer_SetSoundFrequency((Mixer_Sound*)sound, frequency);
OSUnlockMutex(&sound_list_mutex);
}
void AudioBackend_SetSoundVolume(AudioBackend_Sound *sound, long volume)
{
if (sound == NULL)
return;
OSLockMutex(&sound_list_mutex);
Mixer_SetSoundVolume((Mixer_Sound*)sound, volume);
OSUnlockMutex(&sound_list_mutex);
}
void AudioBackend_SetSoundPan(AudioBackend_Sound *sound, long pan)
{
if (sound == NULL)
return;
OSLockMutex(&sound_list_mutex);
Mixer_SetSoundPan((Mixer_Sound*)sound, pan);
OSUnlockMutex(&sound_list_mutex);
}
void AudioBackend_SetOrganyaCallback(void (*callback)(void))
{
// As far as thread-safety goes - this is guarded by
// `organya_milliseconds`, which is guarded by `organya_mutex`.
organya_callback = callback;
}
void AudioBackend_SetOrganyaTimer(unsigned int milliseconds)
{
OSLockMutex(&organya_mutex);
organya_callback_milliseconds = milliseconds;
OSUnlockMutex(&organya_mutex);
}