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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2012 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/* Allow access to a raw mixing buffer */
#include <nds.h>
#include "SDL.h"
#include "SDL_endian.h"
#include "SDL_timer.h"
#include "SDL_audio.h"
#include "../SDL_audiomem.h"
#include "../SDL_audio_c.h"
#include "SDL_ndsaudio.h"
#include "soundcommon.h"
/* Audio driver functions */
static int NDS_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void NDS_WaitAudio(_THIS);
static void NDS_PlayAudio(_THIS);
static Uint8 *NDS_GetAudioBuf(_THIS);
static void NDS_CloseAudio(_THIS);
/* Audio driver bootstrap functions */
u32 framecounter = 0,soundoffset = 0;
static SDL_AudioDevice *sdl_nds_audiodevice;
//void SoundMixCallback(void *stream,u32 size)
//{
// //printf("SoundMixCallback\n");
//
// Uint8 *buffer;
//
// buffer = sdl_nds_audiodevice->hidden->mixbuf;
// memset(buffer, sdl_nds_audiodevice->spec.silence, size);
//
// if (!sdl_nds_audiodevice->paused){
//
//
// //if (sdl_nds_audiodevice->convert.needed) {
// // int silence;
//
// // if (sdl_nds_audiodevice->convert.src_format == AUDIO_U8 ) {
// // silence = 0x80;
// // } else {
// // silence = 0;
// // }
// // memset(sdl_nds_audiodevice->convert.buf, silence, sdl_nds_audiodevice->convert.len);
// // sdl_nds_audiodevice->spec.callback(sdl_nds_audiodevice->spec.userdata,
// // (Uint8 *)sdl_nds_audiodevice->convert.buf,sdl_nds_audiodevice->convert.len);
// // SDL_ConvertAudio(&sdl_nds_audiodevice->convert);
// // memcpy(buffer, sdl_nds_audiodevice->convert.buf, sdl_nds_audiodevice->convert.len_cvt);
// //} else
// {
// sdl_nds_audiodevice->spec.callback(sdl_nds_audiodevice->spec.userdata, buffer, size);
// //memcpy((Sint16 *)stream,buffer, size);
// }
//
// }
//
// if(soundsystem->format == 8)
// {
// int i;
// s32 *buffer32 = (s32 *)buffer;
// s32 *stream32 = (s32 *)stream;
// for(i=0;i<size/4;i++){ *stream32++ = buffer32[i] ^ 0x80808080;}
// //for(i = 0; i < size; i++)
// // ((s8*)stream)[i]=(buffer[i]^0x80);
// }
// else
// {
// int i;
// for(i = 0; i < size; i++){
// //((short*)stream)[i] =(short)buffer[i] << 8; // sound 8bit ---> buffer 16bit
// //if (buffer[i] &0x80)
// //((Sint16*)stream)[i] = 0xff00 | buffer[i];
// ((Sint16*)stream)[i] = (buffer[i] - 128) << 8;
//
// //else
// // ((Sint16*)stream)[i] = buffer[i];
// }
// //register signed char *pSrc =buffer;
// //register short *pDest =stream;
// //int x;
// // for (x=size; x>0; x--)
// // {
// // register short temp = (((short)*pSrc)-128)<<8;
// // pSrc++;
// // *pDest++ = temp;
// // }
//
// //memcpy((Sint16 *)stream,buffer, size);
// }
//}
void SoundMixCallback(void *stream,u32 len)
{
SDL_AudioDevice *audio = (SDL_AudioDevice *)sdl_nds_audiodevice;
/* Silence the buffer, since it's ours */
SDL_memset(stream, audio->spec.silence, len);
/* Only do soemthing if audio is enabled */
if ( ! audio->enabled )
return;
if ( ! audio->paused ) {
if ( audio->convert.needed ) {
//fprintf(stderr,"converting audio\n");
SDL_mutexP(audio->mixer_lock);
(*audio->spec.callback)(audio->spec.userdata,
(Uint8 *)audio->convert.buf,audio->convert.len);
SDL_mutexV(audio->mixer_lock);
SDL_ConvertAudio(&audio->convert);
SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt);
} else {
SDL_mutexP(audio->mixer_lock);
(*audio->spec.callback)(audio->spec.userdata,
(Uint8 *)stream, len);
SDL_mutexV(audio->mixer_lock);
}
}
return;
}
void MixSound(void)
{
int remain;
if(soundsystem->format == 8)
{
if((soundsystem->soundcursor + soundsystem->numsamples) > soundsystem->buffersize)
{
SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor],soundsystem->buffersize - soundsystem->soundcursor);
remain = soundsystem->numsamples - (soundsystem->buffersize - soundsystem->soundcursor);
SoundMixCallback(soundsystem->mixbuffer,remain);
}
else
{
SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor],soundsystem->numsamples);
}
}
else
{
if((soundsystem->soundcursor + soundsystem->numsamples) > (soundsystem->buffersize >> 1))
{
SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor << 1],(soundsystem->buffersize >> 1) - soundsystem->soundcursor);
remain = soundsystem->numsamples - ((soundsystem->buffersize >> 1) - soundsystem->soundcursor);
SoundMixCallback(soundsystem->mixbuffer,remain);
}
else
{
SoundMixCallback(&soundsystem->mixbuffer[soundsystem->soundcursor << 1],soundsystem->numsamples);
}
}
}
void InterruptHandler(void)
{
framecounter++;
}
void FiFoHandler(void)
{
u32 command;
while ( !(REG_IPC_FIFO_CR & (IPC_FIFO_RECV_EMPTY)) )
{
command = REG_IPC_FIFO_RX;
switch(command)
{
case FIFO_NONE:
break;
case UPDATEON_ARM9:
REG_IME = 0;
MixSound();
REG_IME = 1;
SendCommandToArm7(MIXCOMPLETE_ONARM9);
break;
}
}
}
static int Audio_Available(void)
{
return(1);
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* Initialize all variables that we clean on shutdown */
this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
if ( this ) {
SDL_memset(this, 0, (sizeof *this));
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
SDL_free(this);
}
return(0);
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
/* Set the function pointers */
this->OpenAudio = NDS_OpenAudio;
this->WaitAudio = NDS_WaitAudio;
this->PlayAudio = NDS_PlayAudio;
this->GetAudioBuf = NDS_GetAudioBuf;
this->CloseAudio = NDS_CloseAudio;
this->free = Audio_DeleteDevice;
//fprintf(stderr,"Audio_CreateDevice\n");
return this;
}
AudioBootStrap NDSAUD_bootstrap = {
"nds", "NDS audio",
Audio_Available, Audio_CreateDevice
};
void static NDS_WaitAudio(_THIS)
{
//printf("NDS_WaitAudio\n");
}
static void NDS_PlayAudio(_THIS)
{
//printf("playing audio\n");
if (this->paused)
return;
}
static Uint8 *NDS_GetAudioBuf(_THIS)
{
return NULL;//(this->hidden->mixbuf);
}
static void NDS_CloseAudio(_THIS)
{
/* if ( this->hidden->mixbuf != NULL ) {
SDL_FreeAudioMem(this->hidden->mixbuf);
this->hidden->mixbuf = NULL;
}*/
}
static int NDS_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
//printf("NDS_OpenAudio\n");
int format = 0;
//switch(spec->format&0xff) {
//case 8: spec->format = AUDIO_S8;format=8; break;
//case 16: spec->format = AUDIO_S16LSB;format=16; break;
//default:
// SDL_SetError("Unsupported audio format");
// return(-1);
//}
switch (spec->format&~0x1000) {
case AUDIO_S8:
/* Signed 8-bit audio supported */
format=8;
break;
case AUDIO_U8:
spec->format ^= 0x80;format=8;
break;
case AUDIO_U16:
/* Unsigned 16-bit audio unsupported, convert to S16 */
spec->format ^=0x8000;format=16;
case AUDIO_S16:
/* Signed 16-bit audio supported */
format=16;
break;
}
/* Update the fragment size as size in bytes */
SDL_CalculateAudioSpec(spec);
/* Allocate mixing buffer */
//this->hidden->mixlen = spec->size;
//this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
//if ( this->hidden->mixbuf == NULL ) {
// SDL_SetError("Out of Memory");
// return(-1);
//}
SDL_NDSAudio_mutex = 0;
sdl_nds_audiodevice=this;
irqInit();
irqSet(IRQ_VBLANK,&InterruptHandler);
irqSet(IRQ_FIFO_NOT_EMPTY,&FiFoHandler);
irqEnable(IRQ_FIFO_NOT_EMPTY);
REG_IPC_FIFO_CR = IPC_FIFO_ENABLE | IPC_FIFO_SEND_CLEAR | IPC_FIFO_RECV_IRQ;
SoundSystemInit(spec->freq,spec->size,0,format);
SoundStartMixer();
return(1);
}
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