[sdl_omap.git] / src / audio / dc / SDL_dcaudio.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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"

/* Output dreamcast aica */

#include "SDL_timer.h"
#include "SDL_audio.h"
#include "../SDL_audiomem.h"
#include "../SDL_audio_c.h"
#include "../SDL_audiodev_c.h"
#include "SDL_dcaudio.h"

#include "aica.h"
#include <dc/spu.h>

/* Audio driver functions */
static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void DCAUD_WaitAudio(_THIS);
static void DCAUD_PlayAudio(_THIS);
static Uint8 *DCAUD_GetAudioBuf(_THIS);
static void DCAUD_CloseAudio(_THIS);

/* Audio driver bootstrap functions */
static int DCAUD_Available(void)
{
	return 1;
}

static void DCAUD_DeleteDevice(SDL_AudioDevice *device)
{
	SDL_free(device->hidden);
	SDL_free(device);
}

static SDL_AudioDevice *DCAUD_CreateDevice(int devindex)
{
	SDL_AudioDevice *this;

	/* Initialize all variables that we clean on shutdown */
	this = (SDL_AudioDevice *)SDL_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 = DCAUD_OpenAudio;
	this->WaitAudio = DCAUD_WaitAudio;
	this->PlayAudio = DCAUD_PlayAudio;
	this->GetAudioBuf = DCAUD_GetAudioBuf;
	this->CloseAudio = DCAUD_CloseAudio;

	this->free = DCAUD_DeleteDevice;

	spu_init();

	return this;
}

AudioBootStrap DCAUD_bootstrap = {
	"dcaudio", "Dreamcast AICA audio",
	DCAUD_Available, DCAUD_CreateDevice
};

/* This function waits until it is possible to write a full sound buffer */
static void DCAUD_WaitAudio(_THIS)
{
	if (this->hidden->playing) {
		/* wait */
		while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) {
			thd_pass();
		}
	}
}

#define	SPU_RAM_BASE	0xa0800000

static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size)
{
	uint8 *src = src0;
	uint32 *left  = (uint32*)(leftpos +SPU_RAM_BASE);
	uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
	size = (size+7)/8;
	while(size--) {
		unsigned lval,rval;
		lval = *src++;
		rval = *src++;
		lval|= (*src++)<<8;
		rval|= (*src++)<<8;
		lval|= (*src++)<<16;
		rval|= (*src++)<<16;
		lval|= (*src++)<<24;
		rval|= (*src++)<<24;
		g2_write_32(left++,lval);
		g2_write_32(right++,rval);
		g2_fifo_wait();
	}
}

static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size)
{
	uint16 *src = src0;
	uint32 *left  = (uint32*)(leftpos +SPU_RAM_BASE);
	uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
	size = (size+7)/8;
	while(size--) {
		unsigned lval,rval;
		lval = *src++;
		rval = *src++;
		lval|= (*src++)<<16;
		rval|= (*src++)<<16;
		g2_write_32(left++,lval);
		g2_write_32(right++,rval);
		g2_fifo_wait();
	}
}

static void DCAUD_PlayAudio(_THIS)
{
	SDL_AudioSpec *spec = &this->spec;
	unsigned int offset;

	if (this->hidden->playing) {
		/* wait */
		while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) {
			thd_pass();
		}
	}

	offset = this->hidden->nextbuf*spec->size;
	this->hidden->nextbuf^=1;
	/* Write the audio data, checking for EAGAIN on broken audio drivers */
	if (spec->channels==1) {
		spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
	} else {
		offset/=2;
		if ((this->spec.format&255)==8) {
			spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
		} else {
			spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
		}
	}

	if (!this->hidden->playing) {
		int mode;
		this->hidden->playing = 1;
		mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT;
		if (spec->channels==1) {
			aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1);
		} else {
			aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1);
			aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1);
		}
	}
}

static Uint8 *DCAUD_GetAudioBuf(_THIS)
{
	return(this->hidden->mixbuf);
}

static void DCAUD_CloseAudio(_THIS)
{
	aica_stop(0);
	if (this->spec.channels==2) aica_stop(1);
	if ( this->hidden->mixbuf != NULL ) {
		SDL_FreeAudioMem(this->hidden->mixbuf);
		this->hidden->mixbuf = NULL;
	}
}

static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
    Uint16 test_format = SDL_FirstAudioFormat(spec->format);
    int valid_datatype = 0;
    while ((!valid_datatype) && (test_format)) {
        spec->format = test_format;
        switch (test_format) {
            /* only formats Dreamcast accepts... */
            case AUDIO_S8:
            case AUDIO_S16LSB:
                valid_datatype = 1;
                break;

            default:
                test_format = SDL_NextAudioFormat();
                break;
        }
    }

    if (!valid_datatype) {  /* shouldn't happen, but just in case... */
        SDL_SetError("Unsupported audio format");
        return (-1);
    }

    if (spec->channels > 2)
        spec->channels = 2;  /* no more than stereo on the Dreamcast. */

	/* 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 ) {
		return(-1);
	}
	SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
	this->hidden->leftpos = 0x11000;
	this->hidden->rightpos = 0x11000+spec->size;
	this->hidden->playing = 0;
	this->hidden->nextbuf = 0;

	/* We're ready to rock and roll. :-) */
	return(0);
}
Commit	Line	Data
e14743d1	1	/*
	2	SDL - Simple DirectMedia Layer
	3	Copyright (C) 1997-2009 Sam Lantinga
	4
	5	This library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	This library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with this library; if not, write to the Free Software
	17	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18
	19	Sam Lantinga
	20	slouken@libsdl.org
	21
	22	*/
	23	#include "SDL_config.h"
	24
	25	/* Output dreamcast aica */
	26
	27	#include "SDL_timer.h"
	28	#include "SDL_audio.h"
	29	#include "../SDL_audiomem.h"
	30	#include "../SDL_audio_c.h"
	31	#include "../SDL_audiodev_c.h"
	32	#include "SDL_dcaudio.h"
	33
	34	#include "aica.h"
	35	#include <dc/spu.h>
	36
	37	/* Audio driver functions */
	38	static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
	39	static void DCAUD_WaitAudio(_THIS);
	40	static void DCAUD_PlayAudio(_THIS);
	41	static Uint8 *DCAUD_GetAudioBuf(_THIS);
	42	static void DCAUD_CloseAudio(_THIS);
	43
	44	/* Audio driver bootstrap functions */
	45	static int DCAUD_Available(void)
	46	{
	47	return 1;
	48	}
	49
	50	static void DCAUD_DeleteDevice(SDL_AudioDevice *device)
	51	{
	52	SDL_free(device->hidden);
	53	SDL_free(device);
	54	}
	55
	56	static SDL_AudioDevice *DCAUD_CreateDevice(int devindex)
	57	{
	58	SDL_AudioDevice *this;
	59
	60	/* Initialize all variables that we clean on shutdown */
	61	this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
	62	if ( this ) {
	63	SDL_memset(this, 0, (sizeof *this));
	64	this->hidden = (struct SDL_PrivateAudioData *)
65	SDL_malloc((sizeof *this->hidden));
66	}
67	if ( (this == NULL) \|\| (this->hidden == NULL) ) {
68	SDL_OutOfMemory();
69	if ( this ) {
70	SDL_free(this);
71	}
72	return(0);
73	}
74	SDL_memset(this->hidden, 0, (sizeof *this->hidden));
75
76	/* Set the function pointers */
77	this->OpenAudio = DCAUD_OpenAudio;
78	this->WaitAudio = DCAUD_WaitAudio;
79	this->PlayAudio = DCAUD_PlayAudio;
80	this->GetAudioBuf = DCAUD_GetAudioBuf;
81	this->CloseAudio = DCAUD_CloseAudio;
82
83	this->free = DCAUD_DeleteDevice;
84
85	spu_init();
86
87	return this;
88	}
89
90	AudioBootStrap DCAUD_bootstrap = {
91	"dcaudio", "Dreamcast AICA audio",
92	DCAUD_Available, DCAUD_CreateDevice
93	};
94
95	/* This function waits until it is possible to write a full sound buffer */
96	static void DCAUD_WaitAudio(_THIS)
97	{
98	if (this->hidden->playing) {
99	/* wait */
100	while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) {
101	thd_pass();
102	}
103	}
104	}
105
106	#define SPU_RAM_BASE 0xa0800000
107
108	static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size)
109	{
110	uint8 *src = src0;
111	uint32 left = (uint32)(leftpos +SPU_RAM_BASE);
112	uint32 right = (uint32)(rightpos+SPU_RAM_BASE);
113	size = (size+7)/8;
114	while(size--) {
115	unsigned lval,rval;
116	lval = *src++;
117	rval = *src++;
118	lval\|= (*src++)<<8;
119	rval\|= (*src++)<<8;
120	lval\|= (*src++)<<16;
121	rval\|= (*src++)<<16;
122	lval\|= (*src++)<<24;
123	rval\|= (*src++)<<24;
124	g2_write_32(left++,lval);
125	g2_write_32(right++,rval);
126	g2_fifo_wait();
127	}
128	}
129
130	static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size)
131	{
132	uint16 *src = src0;
133	uint32 left = (uint32)(leftpos +SPU_RAM_BASE);
134	uint32 right = (uint32)(rightpos+SPU_RAM_BASE);
135	size = (size+7)/8;
136	while(size--) {
137	unsigned lval,rval;
138	lval = *src++;
139	rval = *src++;
140	lval\|= (*src++)<<16;
141	rval\|= (*src++)<<16;
142	g2_write_32(left++,lval);
143	g2_write_32(right++,rval);
144	g2_fifo_wait();
145	}
146	}
147
148	static void DCAUD_PlayAudio(_THIS)
149	{
150	SDL_AudioSpec *spec = &this->spec;
151	unsigned int offset;
152
153	if (this->hidden->playing) {
154	/* wait */
155	while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) {
156	thd_pass();
157	}
158	}
159
160	offset = this->hidden->nextbuf*spec->size;
161	this->hidden->nextbuf^=1;
162	/* Write the audio data, checking for EAGAIN on broken audio drivers */
163	if (spec->channels==1) {
164	spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
165	} else {
166	offset/=2;
167	if ((this->spec.format&255)==8) {
168	spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
169	} else {
170	spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
171	}
172	}
173
174	if (!this->hidden->playing) {
175	int mode;
176	this->hidden->playing = 1;
177	mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT;
178	if (spec->channels==1) {
179	aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1);
180	} else {
181	aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1);
182	aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1);
183	}
184	}
185	}
186
187	static Uint8 *DCAUD_GetAudioBuf(_THIS)
188	{
189	return(this->hidden->mixbuf);
190	}
191
192	static void DCAUD_CloseAudio(_THIS)
193	{
194	aica_stop(0);
195	if (this->spec.channels==2) aica_stop(1);
196	if ( this->hidden->mixbuf != NULL ) {
197	SDL_FreeAudioMem(this->hidden->mixbuf);
198	this->hidden->mixbuf = NULL;
199	}
200	}
201
202	static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
203	{
204	Uint16 test_format = SDL_FirstAudioFormat(spec->format);
205	int valid_datatype = 0;
206	while ((!valid_datatype) && (test_format)) {
207	spec->format = test_format;
208	switch (test_format) {
209	/* only formats Dreamcast accepts... */
210	case AUDIO_S8:
211	case AUDIO_S16LSB:
212	valid_datatype = 1;
213	break;
214
215	default:
216	test_format = SDL_NextAudioFormat();
217	break;
218	}
219	}
220
221	if (!valid_datatype) { /* shouldn't happen, but just in case... */
222	SDL_SetError("Unsupported audio format");
223	return (-1);
224	}
225
226	if (spec->channels > 2)
227	spec->channels = 2; /* no more than stereo on the Dreamcast. */
228
229	/* Update the fragment size as size in bytes */
230	SDL_CalculateAudioSpec(spec);
231
232	/* Allocate mixing buffer */
233	this->hidden->mixlen = spec->size;
234	this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
235	if ( this->hidden->mixbuf == NULL ) {
236	return(-1);
237	}
238	SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
239	this->hidden->leftpos = 0x11000;
240	this->hidden->rightpos = 0x11000+spec->size;
241	this->hidden->playing = 0;
242	this->hidden->nextbuf = 0;
243
244	/* We're ready to rock and roll. :-) */
245	return(0);
246	}