/*+
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    SDL - Simple DirectMedia Layer+
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    Copyright (C) 1997-2006 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 Lesser General Public+
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    License as published by the Free Software Foundation; either+
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    version 2.1 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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    Lesser General Public License for more details.+
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+
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    You should have received a copy of the GNU Lesser General Public+
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    License along with this library; if not, write to the Free Software+
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA+
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+
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    Sam Lantinga+
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    slouken@libsdl.org+
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*/+
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#include "SDL_config.h"+
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+
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/* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */+
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/* patch for IRIX 5 by Georg Schwarz 18/07/2004 */+
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+
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#include "SDL_timer.h"+
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#include "SDL_audio.h"+
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#include "../SDL_audiomem.h"+
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#include "../SDL_audio_c.h"+
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#include "SDL_irixaudio.h"+
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+
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+
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#ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */+
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#define OLD_IRIX_AUDIO+
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#define alClosePort(x) ALcloseport(x)+
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#define alFreeConfig(x) ALfreeconfig(x)+
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#define alGetFillable(x) ALgetfillable(x)+
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#define alNewConfig() ALnewconfig()+
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#define alOpenPort(x,y,z) ALopenport(x,y,z)+
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#define alSetChannels(x,y) ALsetchannels(x,y)+
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#define alSetQueueSize(x,y) ALsetqueuesize(x,y)+
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#define alSetSampFmt(x,y) ALsetsampfmt(x,y)+
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#define alSetWidth(x,y) ALsetwidth(x,y)+
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#endif+
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+
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/* Audio driver functions */+
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static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec);+
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static void AL_WaitAudio(_THIS);+
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static void AL_PlayAudio(_THIS);+
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static Uint8 *AL_GetAudioBuf(_THIS);+
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static void AL_CloseAudio(_THIS);+
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+
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/* Audio driver bootstrap functions */+
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+
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static int Audio_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 Audio_DeleteDevice(SDL_AudioDevice *device)+
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{+
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	SDL_free(device->hidden);+
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	SDL_free(device);+
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}+
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+
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static SDL_AudioDevice *Audio_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 *)SDL_malloc(sizeof(SDL_AudioDevice));+
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	if ( this ) {+
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		SDL_memset(this, 0, (sizeof *this));+
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		this->hidden = (struct SDL_PrivateAudioData *)+
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				SDL_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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			SDL_free(this);+
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		}+
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		return(0);+
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	}+
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	SDL_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 = AL_OpenAudio;+
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	this->WaitAudio = AL_WaitAudio;+
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	this->PlayAudio = AL_PlayAudio;+
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	this->GetAudioBuf = AL_GetAudioBuf;+
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	this->CloseAudio = AL_CloseAudio;+
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+
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	this->free = Audio_DeleteDevice;+
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+
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	return this;+
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}+
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+
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AudioBootStrap DMEDIA_bootstrap = {+
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	"AL", "IRIX DMedia audio",+
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	Audio_Available, Audio_CreateDevice+
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};+
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+
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+
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void static AL_WaitAudio(_THIS)+
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{+
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	Sint32 timeleft;+
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+
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	timeleft = this->spec.samples - alGetFillable(audio_port);+
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	if ( timeleft > 0 ) {+
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		timeleft /= (this->spec.freq/1000);+
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		SDL_Delay((Uint32)timeleft);+
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	}+
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}+
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+
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static void AL_PlayAudio(_THIS)+
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{+
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	/* Write the audio data out */+
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	if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) {+
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		/* Assume fatal error, for now */+
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		this->enabled = 0;+
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	}+
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}+
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+
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static Uint8 *AL_GetAudioBuf(_THIS)+
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{+
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	return(mixbuf);+
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}+
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+
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static void AL_CloseAudio(_THIS)+
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{+
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	if ( mixbuf != NULL ) {+
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		SDL_FreeAudioMem(mixbuf);+
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		mixbuf = NULL;+
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	}+
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	if ( audio_port != NULL ) {+
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		alClosePort(audio_port);+
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		audio_port = NULL;+
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	}+
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}+
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+
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static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec)+
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{+
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	ALconfig audio_config;+
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#ifdef OLD_IRIX_AUDIO+
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	long audio_param[2];+
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#else+
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	ALpv audio_param;+
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#endif+
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	int width;+
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+
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	/* Determine the audio parameters from the AudioSpec */+
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	switch ( spec->format & 0xFF ) {+
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+
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		case 8: { /* Signed 8 bit audio data */+
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			spec->format = AUDIO_S8;+
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			width = AL_SAMPLE_8;+
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		}+
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		break;+
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+
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		case 16: { /* Signed 16 bit audio data */+
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			spec->format = AUDIO_S16MSB;+
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			width = AL_SAMPLE_16;+
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		}+
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		break;+
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+
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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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+
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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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	/* Set output frequency */+
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#ifdef OLD_IRIX_AUDIO+
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	audio_param[0] = AL_OUTPUT_RATE;+
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	audio_param[1] = spec->freq;+
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	if( ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0 ) {+
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#else+
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	audio_param.param = AL_RATE;+
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	audio_param.value.i = spec->freq;+
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	if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) {+
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#endif+
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		SDL_SetError("alSetParams failed");+
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		return(-1);+
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	}+
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+
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	/* Open the audio port with the requested frequency */+
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	audio_port = NULL;+
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	audio_config = alNewConfig();+
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	if ( audio_config &&+
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	     (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) &&+
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	     (alSetWidth(audio_config, width) >= 0) &&+
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	     (alSetQueueSize(audio_config, spec->samples*2) >= 0) &&+
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	     (alSetChannels(audio_config, spec->channels) >= 0) ) {+
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		audio_port = alOpenPort("SDL audio", "w", audio_config);+
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	}+
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	alFreeConfig(audio_config);+
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	if( audio_port == NULL ) {+
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		SDL_SetError("Unable to open audio port");+
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		return(-1);+
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	}+
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+
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	/* Allocate mixing buffer */+
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	mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size);+
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	if ( mixbuf == NULL ) {+
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		SDL_OutOfMemory();+
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		return(-1);+
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	}+
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	SDL_memset(mixbuf, spec->silence, spec->size);+
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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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