SDL_irixaudio.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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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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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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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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#include <stdlib.h>
#include "SDL_endian.h"
#include "SDL_timer.h"
#include "SDL_audio.h"
#include "SDL_audiomem.h"
#include "SDL_audio_c.h"
#include "SDL_irixaudio.h"
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#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
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/* 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)
{
free(device->hidden);
free(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 ) {
memset(this, 0, (sizeof *this));
this->hidden = (struct SDL_PrivateAudioData *)
malloc((sizeof *this->hidden));
}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
free(this);
}
return(0);
}
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;
}
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AudioBootStrap DMEDIA_bootstrap = {
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"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 ) {
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alClosePort(audio_port);
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audio_port = NULL;
}
}
static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
ALconfig audio_config;
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#ifdef OLD_IRIX_AUDIO
long audio_param[2];
#else
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ALpv audio_param;
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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 */
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#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
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audio_param.param = AL_RATE;
audio_param.value.i = spec->freq;
if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) {
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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) ) {
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audio_port = alOpenPort("SDL audio", "w", audio_config);
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}
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);
}
memset(mixbuf, spec->silence, spec->size);
/* We're ready to rock and roll. :-) */
return(0);
}