136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/*
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* $Id: sgidrv.c 1.5 1996/08/05 18:51:19 chasan released $
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*
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* Silicon Graphics Indigo audio driver.
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*
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* Copyright (C) 1995-1999 Carlos Hasan
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <audio.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "audio.h"
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#include "drivers.h"
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/*
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* SGI audio driver buffer size
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*/
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#define BUFFERSIZE 2048
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/*
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* SGI audio driver configuration structure
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*/
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static struct {
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ALport Port;
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ALconfig Config;
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WORD wFormat;
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BYTE aBuffer[BUFFERSIZE];
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LPFNAUDIOWAVE lpfnAudioWave;
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} Audio;
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/*
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* SGI audio driver API interface
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*/
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static UINT AIAPI GetAudioCaps(LPAUDIOCAPS lpCaps)
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{
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static AUDIOCAPS Caps =
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{
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AUDIO_PRODUCT_SGI, "Silicon Graphics",
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AUDIO_FORMAT_1M08 | AUDIO_FORMAT_1S08 |
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AUDIO_FORMAT_1M16 | AUDIO_FORMAT_1S16 |
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AUDIO_FORMAT_2M08 | AUDIO_FORMAT_2S08 |
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AUDIO_FORMAT_2M16 | AUDIO_FORMAT_2S16 |
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AUDIO_FORMAT_4M08 | AUDIO_FORMAT_4S08 |
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AUDIO_FORMAT_4M16 | AUDIO_FORMAT_4S16
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};
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memcpy(lpCaps, &Caps, sizeof(AUDIOCAPS));
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return AUDIO_ERROR_NONE;
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}
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static UINT AIAPI PingAudio(VOID)
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{
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return AUDIO_ERROR_NONE;
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}
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static UINT AIAPI OpenAudio(LPAUDIOINFO lpInfo)
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{
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long op[2];
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memset(&Audio, 0, sizeof(Audio));
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if ((Audio.Config = ALnewconfig()) != NULL) {
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/* setup encoding format for playback */
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ALsetwidth(Audio.Config, lpInfo->wFormat & AUDIO_FORMAT_16BITS ?
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AL_SAMPLE_16 : AL_SAMPLE_8);
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ALsetchannels(Audio.Config, lpInfo->wFormat & AUDIO_FORMAT_STEREO ?
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AL_STEREO : AL_MONO);
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/* open audio port and configure it */
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Audio.Port = ALopenport("Audio Port", "w", Audio.Config);
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Audio.wFormat = lpInfo->wFormat;
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/* setup playback sampling frequency */
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if (Audio.Port != NULL) {
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op[0] = AL_OUTPUT_RATE;
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op[1] = lpInfo->nSampleRate;
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ALsetparms(AL_DEFAULT_DEVICE, op, 2);
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return AUDIO_ERROR_NONE;
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}
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}
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return AUDIO_ERROR_DEVICEBUSY;
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}
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static UINT AIAPI CloseAudio(VOID)
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{
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while (ALgetfilled(Audio.Port) > 0)
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sleep(1);
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ALcloseport(Audio.Port);
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ALfreeconfig(Audio.Config);
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return AUDIO_ERROR_NONE;
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}
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static UINT AIAPI UpdateAudio(UINT nFrames)
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{
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if (Audio.wFormat & AUDIO_FORMAT_16BITS) nFrames <<= 1;
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if (Audio.wFormat & AUDIO_FORMAT_STEREO) nFrames <<= 1;
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if (nFrames <= 0 || nFrames >= sizeof(Audio.aBuffer))
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nFrames = sizeof(Audio.aBuffer);
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if (Audio.lpfnAudioWave != NULL) {
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Audio.lpfnAudioWave(Audio.aBuffer, nFrames);
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ALwritesamps(Audio.Port, Audio.aBuffer, nFrames >>
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((Audio.wFormat & AUDIO_FORMAT_16BITS) != 0));
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}
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return AUDIO_ERROR_NONE;
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}
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static UINT AIAPI SetAudioCallback(LPFNAUDIOWAVE lpfnAudioWave)
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{
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Audio.lpfnAudioWave = lpfnAudioWave;
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return AUDIO_ERROR_NONE;
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}
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/*
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* SGI audio driver public interface
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*/
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AUDIOWAVEDRIVER SiliconWaveDriver =
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{
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GetAudioCaps, PingAudio, OpenAudio, CloseAudio,
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UpdateAudio, SetAudioCallback
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};
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AUDIODRIVER SiliconDriver =
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{
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&SiliconWaveDriver, NULL
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};
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