/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 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

*/

/* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */

/* patch for IRIX 5 by Georg Schwarz 18/07/2004 */

#include "SDL_timer.h"

#include "SDL_audio.h"

#include "SDL_audiomem.h"

#include "SDL_audio_c.h"

#include "SDL_irixaudio.h"

#ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */

#define OLD_IRIX_AUDIO

#define alClosePort(x) ALcloseport(x)

#define alFreeConfig(x) ALfreeconfig(x)

#define alGetFillable(x) ALgetfillable(x)

#define alNewConfig() ALnewconfig()

#define alOpenPort(x,y,z) ALopenport(x,y,z)

#define alSetChannels(x,y) ALsetchannels(x,y)

#define alSetQueueSize(x,y) ALsetqueuesize(x,y)

#define alSetSampFmt(x,y) ALsetsampfmt(x,y)

#define alSetWidth(x,y) ALsetwidth(x,y)

#endif

/* Audio driver functions */

static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec);

static void AL_WaitAudio(_THIS);

static void AL_PlayAudio(_THIS);

static Uint8 *AL_GetAudioBuf(_THIS);

static void AL_CloseAudio(_THIS);

/* Audio driver bootstrap functions */

static int Audio_Available(void)

{

return 1;

}

static void Audio_DeleteDevice(SDL_AudioDevice *device)

{

SDL_free(device->hidden);

SDL_free(device);

}

static SDL_AudioDevice *Audio_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 = AL_OpenAudio;

this->WaitAudio = AL_WaitAudio;

this->PlayAudio = AL_PlayAudio;

this->GetAudioBuf = AL_GetAudioBuf;

this->CloseAudio = AL_CloseAudio;

this->free = Audio_DeleteDevice;

return this;

}

AudioBootStrap DMEDIA_bootstrap = {

"AL", "IRIX DMedia audio",

Audio_Available, Audio_CreateDevice

};

void static AL_WaitAudio(_THIS)

{

Sint32 timeleft;

timeleft = this->spec.samples - alGetFillable(audio_port);

if ( timeleft > 0 ) {

timeleft /= (this->spec.freq/1000);

SDL_Delay((Uint32)timeleft);

}

}

static void AL_PlayAudio(_THIS)

{

/* Write the audio data out */

if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) {

/* Assume fatal error, for now */

this->enabled = 0;

}

}

static Uint8 *AL_GetAudioBuf(_THIS)

{

return(mixbuf);

}

static void AL_CloseAudio(_THIS)

{

if ( mixbuf != NULL ) {

SDL_FreeAudioMem(mixbuf);

mixbuf = NULL;

}

if ( audio_port != NULL ) {

alClosePort(audio_port);

audio_port = NULL;

}

}

static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec)

{

ALconfig audio_config;

#ifdef OLD_IRIX_AUDIO

long audio_param[2];

#else

ALpv audio_param;

#endif

int width;

/* Determine the audio parameters from the AudioSpec */

switch ( spec->format & 0xFF ) {

case 8: { /* Signed 8 bit audio data */

spec->format = AUDIO_S8;

width = AL_SAMPLE_8;

}

break;

case 16: { /* Signed 16 bit audio data */

spec->format = AUDIO_S16MSB;

width = AL_SAMPLE_16;

}

break;

default: {

SDL_SetError("Unsupported audio format");

return(-1);

}

}

/* Update the fragment size as size in bytes */

SDL_CalculateAudioSpec(spec);

/* Set output frequency */

#ifdef OLD_IRIX_AUDIO

audio_param[0] = AL_OUTPUT_RATE;

audio_param[1] = spec->freq;

if( ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0 ) {

#else

audio_param.param = AL_RATE;

audio_param.value.i = spec->freq;

if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) {

#endif

SDL_SetError("alSetParams failed");

return(-1);

}

/* Open the audio port with the requested frequency */

audio_port = NULL;

audio_config = alNewConfig();

if ( audio_config &&

(alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) &&

(alSetWidth(audio_config, width) >= 0) &&

(alSetQueueSize(audio_config, spec->samples*2) >= 0) &&

(alSetChannels(audio_config, spec->channels) >= 0) ) {

audio_port = alOpenPort("SDL audio", "w", audio_config);

}

alFreeConfig(audio_config);

if( audio_port == NULL ) {

SDL_SetError("Unable to open audio port");

return(-1);

}

/* Allocate mixing buffer */

mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size);

if ( mixbuf == NULL ) {

SDL_OutOfMemory();

return(-1);

}

SDL_memset(mixbuf, spec->silence, spec->size);

/* We're ready to rock and roll. :-) */

return(0);

}