src/audio/dsp/SDL_dspaudio.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 29 Jan 2006 06:40:13 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 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 Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 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,
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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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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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    Modified in Oct 2004 by Hannu Savolainen 
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    hannu@opensound.com
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/* Allow access to a raw mixing buffer */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#ifdef OSS_USE_SOUNDCARD_H
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/* This is installed on some systems */
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#include <soundcard.h>
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#else
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/* This is recommended by OSS */
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#include <sys/soundcard.h>
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#endif
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#include "SDL_audio.h"
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#include "SDL_error.h"
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#include "SDL_audiomem.h"
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#include "SDL_audio_c.h"
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#include "SDL_timer.h"
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#include "SDL_audiodev_c.h"
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#include "SDL_dspaudio.h"
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/* The tag name used by DSP audio */
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#define DSP_DRIVER_NAME         "dsp"
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/* Open the audio device for playback, and don't block if busy */
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#define OPEN_FLAGS	(O_WRONLY|O_NONBLOCK)
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/* Audio driver functions */
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static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void DSP_WaitAudio(_THIS);
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static void DSP_PlayAudio(_THIS);
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static Uint8 *DSP_GetAudioBuf(_THIS);
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static void DSP_CloseAudio(_THIS);
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/* Audio driver bootstrap functions */
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static int Audio_Available(void)
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{
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	int fd;
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	int available;
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	available = 0;
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	fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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	if ( fd >= 0 ) {
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		available = 1;
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		close(fd);
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	}
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	return(available);
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}
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static void Audio_DeleteDevice(SDL_AudioDevice *device)
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{
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	free(device->hidden);
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	free(device);
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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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	/* Initialize all variables that we clean on shutdown */
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	this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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	if ( this ) {
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		memset(this, 0, (sizeof *this));
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		this->hidden = (struct SDL_PrivateAudioData *)
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				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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			free(this);
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		}
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		return(0);
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	}
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	memset(this->hidden, 0, (sizeof *this->hidden));
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	audio_fd = -1;
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	/* Set the function pointers */
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	this->OpenAudio = DSP_OpenAudio;
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	this->WaitAudio = DSP_WaitAudio;
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	this->PlayAudio = DSP_PlayAudio;
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	this->GetAudioBuf = DSP_GetAudioBuf;
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	this->CloseAudio = DSP_CloseAudio;
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	this->free = Audio_DeleteDevice;
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	return this;
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}
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AudioBootStrap DSP_bootstrap = {
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	DSP_DRIVER_NAME, "OSS /dev/dsp standard audio",
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	Audio_Available, Audio_CreateDevice
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};
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/* This function waits until it is possible to write a full sound buffer */
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static void DSP_WaitAudio(_THIS)
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{
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	/* Not needed at all since OSS handles waiting automagically */
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}
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static void DSP_PlayAudio(_THIS)
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{
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	if (write(audio_fd, mixbuf, mixlen)==-1)
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	{
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		perror("Audio write");
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		this->enabled = 0;
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	}
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#ifdef DEBUG_AUDIO
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	fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen);
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#endif
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}
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static Uint8 *DSP_GetAudioBuf(_THIS)
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{
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	return(mixbuf);
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}
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   156
static void DSP_CloseAudio(_THIS)
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   157
{
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   158
	if ( mixbuf != NULL ) {
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   159
		SDL_FreeAudioMem(mixbuf);
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   160
		mixbuf = NULL;
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diff changeset
   161
	}
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   162
	if ( audio_fd >= 0 ) {
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   163
		close(audio_fd);
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   164
		audio_fd = -1;
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   165
	}
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diff changeset
   166
}
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diff changeset
   167
968
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   168
static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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   169
{
968
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   170
	char audiodev[1024];
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   171
	int format;
0
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   172
	int value;
968
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   173
	int frag_spec;
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   174
	Uint16 test_format;
0
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   175
968
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   176
	/* Open the audio device */
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   177
	audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
0
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   178
	if ( audio_fd < 0 ) {
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   179
		SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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   180
		return(-1);
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   181
	}
968
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   182
	mixbuf = NULL;
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   183
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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   184
	/* Make the file descriptor use blocking writes with fcntl() */
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   185
	{ long flags;
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   186
		flags = fcntl(audio_fd, F_GETFL);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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   187
		flags &= ~O_NONBLOCK;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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   188
		if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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   189
			SDL_SetError("Couldn't set audio blocking mode");
1037
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   190
			DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   191
			return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   192
		}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   193
	}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   194
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   195
	/* Get a list of supported hardware formats */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   196
	if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   197
		perror("SNDCTL_DSP_GETFMTS");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   198
		SDL_SetError("Couldn't get audio format list");
1037
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diff changeset
   199
		DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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   200
		return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   201
	}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   202
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   203
	/* Try for a closest match on audio format */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   204
	format = 0;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   205
	for ( test_format = SDL_FirstAudioFormat(spec->format);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   206
						! format && test_format; ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   207
#ifdef DEBUG_AUDIO
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   208
		fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   209
#endif
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   210
		switch ( test_format ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   211
			case AUDIO_U8:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   212
				if ( value & AFMT_U8 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   213
					format = AFMT_U8;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   214
				}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   215
				break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   216
			case AUDIO_S16LSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   217
				if ( value & AFMT_S16_LE ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   218
					format = AFMT_S16_LE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   219
				}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   220
				break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   221
			case AUDIO_S16MSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   222
				if ( value & AFMT_S16_BE ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   223
					format = AFMT_S16_BE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   224
				}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   225
				break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   226
#if 0
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   227
/*
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   228
 * These formats are not used by any real life systems so they are not 
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   229
 * needed here.
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   230
 */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   231
			case AUDIO_S8:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   232
				if ( value & AFMT_S8 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   233
					format = AFMT_S8;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   234
				}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   235
				break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
   236
			case AUDIO_U16LSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
   237
				if ( value & AFMT_U16_LE ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   238
					format = AFMT_U16_LE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   239
				}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   240
				break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
   241
			case AUDIO_U16MSB:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   242
				if ( value & AFMT_U16_BE ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   243
					format = AFMT_U16_BE;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   244
				}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
   245
				break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
   246
#endif
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   247
			default:
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   248
				format = 0;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   249
				break;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   250
		}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   251
		if ( ! format ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   252
			test_format = SDL_NextAudioFormat();
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   253
		}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   254
	}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   255
	if ( format == 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   256
		SDL_SetError("Couldn't find any hardware audio formats");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
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diff changeset
   257
		DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   258
		return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   259
	}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   260
	spec->format = test_format;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   261
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   262
	/* Set the audio format */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   263
	value = format;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
   264
	if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   265
						(value != format) ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   266
		perror("SNDCTL_DSP_SETFMT");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   267
		SDL_SetError("Couldn't set audio format");
1037
c5dedfdb4e42 Date: Tue, 01 Feb 2005 17:53:07 -0800
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diff changeset
   268
		DSP_CloseAudio(this);
968
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
   269
		return(-1);
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   270
	}
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   271
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   272
	/* Set the number of channels of output */
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   273
	value = spec->channels;
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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parents: 960
diff changeset
   274
	if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) {
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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diff changeset
   275
		perror("SNDCTL_DSP_CHANNELS");
4675910b0b7b Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST)
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		SDL_SetError("Cannot set the number of channels");
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		DSP_CloseAudio(this);
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		return(-1);
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	}
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	spec->channels = value;
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	/* Set the DSP frequency */
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	value = spec->freq;
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	if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) {
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		perror("SNDCTL_DSP_SPEED");
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		SDL_SetError("Couldn't set audio frequency");
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		DSP_CloseAudio(this);
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		return(-1);
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	}
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	spec->freq = value;
0
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	/* Calculate the final parameters for this audio specification */
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	SDL_CalculateAudioSpec(spec);
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	/* Determine the power of two of the fragment size */
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	for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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	if ( (0x01<<frag_spec) != spec->size ) {
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		SDL_SetError("Fragment size must be a power of two");
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		DSP_CloseAudio(this);
0
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		return(-1);
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	}
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	frag_spec |= 0x00020000;	/* two fragments, for low latency */
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	/* Set the audio buffering parameters */
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#ifdef DEBUG_AUDIO
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	fprintf(stderr, "Requesting %d fragments of size %d\n",
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		(frag_spec >> 16), 1<<(frag_spec&0xFFFF));
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#endif
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	if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
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		perror("SNDCTL_DSP_SETFRAGMENT");
0
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		fprintf(stderr, "Warning: Couldn't set audio fragment size\n");
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	}
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#ifdef DEBUG_AUDIO
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	{ audio_buf_info info;
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	  ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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	  fprintf(stderr, "fragments = %d\n", info.fragments);
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	  fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
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	  fprintf(stderr, "fragsize = %d\n", info.fragsize);
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	  fprintf(stderr, "bytes = %d\n", info.bytes);
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	}
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#endif
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	/* Allocate mixing buffer */
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	mixlen = spec->size;
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	mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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	if ( mixbuf == NULL ) {
1281
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		DSP_CloseAudio(this);
0
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		return(-1);
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	}
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	memset(mixbuf, spec->silence, spec->size);
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   331
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	/* Get the parent process id (we're the parent of the audio thread) */
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   333
	parent = getpid();
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   334
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   335
	/* We're ready to rock and roll. :-) */
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   336
	return(0);
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   337
}