/*+
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    SDL - Simple DirectMedia Layer+
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga+
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+
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    This library is free software; you can redistribute it and/or+
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    modify it under the terms of the GNU Library General Public+
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    License as published by the Free Software Foundation; either+
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    version 2 of the License, or (at your option) any later version.+
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+
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    This library is distributed in the hope that it will be useful,+
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    but WITHOUT ANY WARRANTY; without even the implied warranty of+
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU+
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    Library General Public License for more details.+
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+
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    You should have received a copy of the GNU Library General Public+
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    License along with this library; if not, write to the Free+
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA+
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+
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    BERO <bero@geocities.co.jp>+
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    based on SDL_diskaudio.c by Sam Lantinga <slouken@libsdl.org>+
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+
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*/+
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+
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#ifdef SAVE_RCSID+
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static char rcsid =+
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 "@(#) $Id$";+
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#endif+
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+
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/* Output dreamcast aica */+
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+
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#include <stdlib.h>+
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#include <stdio.h>+
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#include <string.h>+
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#include <errno.h>+
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#include <unistd.h>+
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#include <sys/stat.h>+
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#include <sys/types.h>+
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#include <sys/stat.h>+
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#include <fcntl.h>+
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+
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+
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#include "SDL_audio.h"+
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#include "SDL_error.h"+
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#include "SDL_audiomem.h"+
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#include "SDL_audio_c.h"+
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#include "SDL_timer.h"+
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#include "SDL_audiodev_c.h"+
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#include "SDL_dcaudio.h"+
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+
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#include "aica.h"+
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#include <dc/spu.h>+
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+
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/* Audio driver functions */+
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static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);+
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static void DCAUD_WaitAudio(_THIS);+
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static void DCAUD_PlayAudio(_THIS);+
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static Uint8 *DCAUD_GetAudioBuf(_THIS);+
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static void DCAUD_CloseAudio(_THIS);+
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+
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/* Audio driver bootstrap functions */+
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static int DCAUD_Available(void)+
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{+
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	return 1;+
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}+
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+
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static void DCAUD_DeleteDevice(SDL_AudioDevice *device)+
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{+
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	free(device->hidden);+
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	free(device);+
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}+
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+
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static SDL_AudioDevice *DCAUD_CreateDevice(int devindex)+
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{+
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	SDL_AudioDevice *this;+
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+
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	/* Initialize all variables that we clean on shutdown */+
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	this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));+
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	if ( this ) {+
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		memset(this, 0, (sizeof *this));+
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		this->hidden = (struct SDL_PrivateAudioData *)+
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				malloc((sizeof *this->hidden));+
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	}+
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	if ( (this == NULL) || (this->hidden == NULL) ) {+
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		SDL_OutOfMemory();+
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		if ( this ) {+
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			free(this);+
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		}+
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		return(0);+
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	}+
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	memset(this->hidden, 0, (sizeof *this->hidden));+
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+
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	/* Set the function pointers */+
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	this->OpenAudio = DCAUD_OpenAudio;+
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	this->WaitAudio = DCAUD_WaitAudio;+
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	this->PlayAudio = DCAUD_PlayAudio;+
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	this->GetAudioBuf = DCAUD_GetAudioBuf;+
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	this->CloseAudio = DCAUD_CloseAudio;+
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+
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	this->free = DCAUD_DeleteDevice;+
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+
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	spu_init();+
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+
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	return this;+
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}+
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+
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AudioBootStrap DCAUD_bootstrap = {+
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	"dcaudio", "Dreamcast AICA audio",+
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	DCAUD_Available, DCAUD_CreateDevice+
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};+
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+
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/* This function waits until it is possible to write a full sound buffer */+
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static void DCAUD_WaitAudio(_THIS)+
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{+
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	if (this->hidden->playing) {+
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		/* wait */+
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		while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) {+
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			thd_pass();+
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		}+
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	}+
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}+
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+
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#define	SPU_RAM_BASE	0xa0800000+
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+
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static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size)+
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{+
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	uint8 *src = src0;+
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	uint32 *left  = (uint32*)(leftpos +SPU_RAM_BASE);+
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	uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);+
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	size = (size+7)/8;+
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	while(size--) {+
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		unsigned lval,rval;+
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		lval = *src++;+
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		rval = *src++;+
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		lval|= (*src++)<<8;+
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		rval|= (*src++)<<8;+
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		lval|= (*src++)<<16;+
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		rval|= (*src++)<<16;+
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		lval|= (*src++)<<24;+
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		rval|= (*src++)<<24;+
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		g2_write_32(left++,lval);+
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		g2_write_32(right++,rval);+
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		g2_fifo_wait();+
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	}+
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}+
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+
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static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size)+
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{+
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	uint16 *src = src0;+
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	uint32 *left  = (uint32*)(leftpos +SPU_RAM_BASE);+
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	uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);+
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	size = (size+7)/8;+
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	while(size--) {+
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		unsigned lval,rval;+
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		lval = *src++;+
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		rval = *src++;+
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		lval|= (*src++)<<16;+
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		rval|= (*src++)<<16;+
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		g2_write_32(left++,lval);+
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		g2_write_32(right++,rval);+
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		g2_fifo_wait();+
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	}+
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}+
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+
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static void DCAUD_PlayAudio(_THIS)+
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{+
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	SDL_AudioSpec *spec = &this->spec;+
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	unsigned int offset;+
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+
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	if (this->hidden->playing) {+
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		/* wait */+
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		while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) {+
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			thd_pass();+
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		}+
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	}+
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+
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	offset = this->hidden->nextbuf*spec->size;+
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	this->hidden->nextbuf^=1;+
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	/* Write the audio data, checking for EAGAIN on broken audio drivers */+
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	if (spec->channels==1) {+
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		spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen);+
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	} else {+
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		offset/=2;+
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		if ((this->spec.format&255)==8) {+
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			spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);+
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		} else {+
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			spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);+
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		}+
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	}+
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+
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	if (!this->hidden->playing) {+
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		int mode;+
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		this->hidden->playing = 1;+
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		mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT;+
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		if (spec->channels==1) {+
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			aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1);+
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		} else {+
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			aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1);+
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			aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1);+
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		}+
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	}+
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}+
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+
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static Uint8 *DCAUD_GetAudioBuf(_THIS)+
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{+
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	return(this->hidden->mixbuf);+
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}+
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+
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static void DCAUD_CloseAudio(_THIS)+
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{+
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	aica_stop(0);+
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	if (this->spec.channels==2) aica_stop(1);+
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	if ( this->hidden->mixbuf != NULL ) {+
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		SDL_FreeAudioMem(this->hidden->mixbuf);+
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		this->hidden->mixbuf = NULL;+
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	}+
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}+
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+
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static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)+
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{+
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	switch(spec->format&0xff) {+
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	case  8: spec->format = AUDIO_S8; break;+
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	case 16: spec->format = AUDIO_S16LSB; break;+
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	default:+
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		SDL_SetError("Unsupported audio format");+
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		return(-1);+
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	}+
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+
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	/* Update the fragment size as size in bytes */+
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	SDL_CalculateAudioSpec(spec);+
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+
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	/* Allocate mixing buffer */+
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	this->hidden->mixlen = spec->size;+
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	this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);+
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	if ( this->hidden->mixbuf == NULL ) {+
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		return(-1);+
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	}+
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	memset(this->hidden->mixbuf, spec->silence, spec->size);+
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	this->hidden->leftpos = 0x11000;+
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	this->hidden->rightpos = 0x11000+spec->size;+
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	this->hidden->playing = 0;+
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	this->hidden->nextbuf = 0;+
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+
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	/* We're ready to rock and roll. :-) */+
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	return(0);+
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}+
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