src/audio/dma/SDL_dmaaudio.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 21 Feb 2006 08:46:50 +0000
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child 4159 a1b03ba2fcd0
permissions -rw-r--r--
Use consistent identifiers for the various platforms we support. Make sure every source file includes SDL_config.h, so the proper system headers are chosen.
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/*
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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,
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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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    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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    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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/* Allow access to a raw mixing buffer */
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#include <stdio.h>
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#include <string.h>	/* For strerror() */
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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/types.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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#include <sys/mman.h>
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#if SDL_AUDIO_DRIVER_OSS_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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#ifndef MAP_FAILED
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#define MAP_FAILED	((Uint8 *)-1)
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#endif
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#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "../SDL_audiodev_c.h"
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#include "SDL_dmaaudio.h"
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/* The tag name used by DMA audio */
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#define DMA_DRIVER_NAME         "dma"
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/* Open the audio device for playback, and don't block if busy */
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#define OPEN_FLAGS	(O_RDWR|O_NONBLOCK)
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/* Audio driver functions */
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static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void DMA_WaitAudio(_THIS);
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static void DMA_PlayAudio(_THIS);
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static Uint8 *DMA_GetAudioBuf(_THIS);
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static void DMA_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 available;
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	int fd;
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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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		int caps;
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		struct audio_buf_info info;
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		if ( (ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) &&
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	             (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) &&
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		     (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0) ) {
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			available = 1;
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		}
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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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	SDL_free(device->hidden);
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	SDL_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 *)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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	audio_fd = -1;
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	/* Set the function pointers */
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	this->OpenAudio = DMA_OpenAudio;
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	this->WaitAudio = DMA_WaitAudio;
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	this->PlayAudio = DMA_PlayAudio;
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	this->GetAudioBuf = DMA_GetAudioBuf;
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	this->CloseAudio = DMA_CloseAudio;
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	this->free = Audio_DeleteDevice;
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	return this;
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}
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AudioBootStrap DMA_bootstrap = {
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	DMA_DRIVER_NAME, "OSS /dev/dsp DMA 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 DMA_WaitAudio(_THIS)
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{
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	fd_set fdset;
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	/* Check to see if the thread-parent process is still alive */
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	{ static int cnt = 0;
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		/* Note that this only works with thread implementations 
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		   that use a different process id for each thread.
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		*/
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		if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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			if ( kill(parent, 0) < 0 ) {
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				this->enabled = 0;
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			}
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		}
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	}
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	/* See if we need to use timed audio synchronization */
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	if ( frame_ticks ) {
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		/* Use timer for general audio synchronization */
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		Sint32 ticks;
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		ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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		if ( ticks > 0 ) {
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			SDL_Delay(ticks);
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		}
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	} else {
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		/* Use select() for audio synchronization */
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		struct timeval timeout;
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		FD_ZERO(&fdset);
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		FD_SET(audio_fd, &fdset);
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		timeout.tv_sec = 10;
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		timeout.tv_usec = 0;
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#ifdef DEBUG_AUDIO
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		fprintf(stderr, "Waiting for audio to get ready\n");
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#endif
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		if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) {
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			const char *message =
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#ifdef AUDIO_OSPACE_HACK
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			"Audio timeout - buggy audio driver? (trying ospace)";
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#else
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			"Audio timeout - buggy audio driver? (disabled)";
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#endif
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			/* In general we should never print to the screen,
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			   but in this case we have no other way of letting
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			   the user know what happened.
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			*/
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			fprintf(stderr, "SDL: %s\n", message);
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#ifdef AUDIO_OSPACE_HACK
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			/* We may be able to use GET_OSPACE trick */
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			frame_ticks = (float)(this->spec->samples*1000) /
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			                      this->spec->freq;
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			next_frame = SDL_GetTicks()+frame_ticks;
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#else
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			this->enabled = 0;
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			/* Don't try to close - may hang */
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			audio_fd = -1;
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#ifdef DEBUG_AUDIO
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			fprintf(stderr, "Done disabling audio\n");
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#endif
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#endif /* AUDIO_OSPACE_HACK */
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		}
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#ifdef DEBUG_AUDIO
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		fprintf(stderr, "Ready!\n");
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#endif
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	}
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}
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static void DMA_PlayAudio(_THIS)
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{
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	/* If timer synchronization is enabled, set the next write frame */
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	if ( frame_ticks ) {
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		next_frame += frame_ticks;
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	}
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	return;
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}
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static Uint8 *DMA_GetAudioBuf(_THIS)
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{
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	count_info info;
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	int playing;
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	int filling;
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	/* Get number of blocks, looping if we're not using select() */
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	do {
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		if ( ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0 ) {
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			/* Uh oh... */
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			this->enabled = 0;
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			return(NULL);
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		}
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	} while ( frame_ticks && (info.blocks < 1) );
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#ifdef DEBUG_AUDIO
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	if ( info.blocks > 1 ) {
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		printf("Warning: audio underflow (%d frags)\n", info.blocks-1);
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	}
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#endif
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	playing = info.ptr / this->spec.size;
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	filling = (playing + 1)%num_buffers;
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	return (dma_buf + (filling * this->spec.size));
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}
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static void DMA_CloseAudio(_THIS)
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{
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	if ( dma_buf != NULL ) {
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		munmap(dma_buf, dma_len);
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		dma_buf = NULL;
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   243
	}
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	if ( audio_fd >= 0 ) {
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		close(audio_fd);
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		audio_fd = -1;
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	}
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}
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static int DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo,
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							SDL_AudioSpec *spec)
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{
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	int frag_spec;
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	int value;
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	/* Close and then reopen the audio device */
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   257
	close(audio_fd);
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   258
	audio_fd = open(audiodev, O_RDWR, 0);
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   259
	if ( audio_fd < 0 ) {
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		SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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   261
		return(-1);
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   262
	}
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   264
	/* Calculate the final parameters for this audio specification */
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	SDL_CalculateAudioSpec(spec);
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   266
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   267
	/* Determine the power of two of the fragment size */
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   268
	for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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   269
	if ( (0x01<<frag_spec) != spec->size ) {
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		SDL_SetError("Fragment size must be a power of two");
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		return(-1);
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   272
	}
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	/* Set the audio buffering parameters */
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	if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
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		SDL_SetError("Couldn't set audio fragment spec");
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		return(-1);
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	}
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	/* Set the audio format */
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	value = format;
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	if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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   283
						(value != format) ) {
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   284
		SDL_SetError("Couldn't set audio format");
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   285
		return(-1);
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   286
	}
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   287
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   288
	/* Set mono or stereo audio */
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   289
	value = (spec->channels > 1);
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	if ( (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) ||
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   291
						(value != stereo) ) {
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   292
		SDL_SetError("Couldn't set audio channels");
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		return(-1);
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   294
	}
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   295
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   296
	/* Set the DSP frequency */
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	value = spec->freq;
960
eec28a5278be Date: Sat, 9 Oct 2004 02:46:18 +0300 (EEST)
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parents: 769
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   298
	if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) {
0
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   299
		SDL_SetError("Couldn't set audio frequency");
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		return(-1);
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   301
	}
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	spec->freq = value;
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   303
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   304
	/* We successfully re-opened the audio */
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   305
	return(0);
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   306
}
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   307
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   308
static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec)
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   309
{
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   310
	char audiodev[1024];
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diff changeset
   311
	int format;
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   312
	int stereo;
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parents:
diff changeset
   313
	int value;
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   314
	Uint16 test_format;
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parents:
diff changeset
   315
	struct audio_buf_info info;
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parents:
diff changeset
   316
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   317
	/* Reset the timer synchronization flag */
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   318
	frame_ticks = 0.0;
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parents:
diff changeset
   319
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   320
	/* Open the audio device */
74212992fb08 Initial revision
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parents:
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   321
	audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
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parents:
diff changeset
   322
	if ( audio_fd < 0 ) {
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   323
		SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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diff changeset
   324
		return(-1);
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diff changeset
   325
	}
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   326
	dma_buf = NULL;
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diff changeset
   327
	ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
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parents:
diff changeset
   328
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diff changeset
   329
	/* Get a list of supported hardware formats */
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   330
	if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
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parents:
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   331
		SDL_SetError("Couldn't get audio format list");
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   332
		return(-1);
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parents:
diff changeset
   333
	}
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parents:
diff changeset
   334
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parents:
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   335
	/* Try for a closest match on audio format */
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   336
	format = 0;
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   337
	for ( test_format = SDL_FirstAudioFormat(spec->format);
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parents:
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   338
						! format && test_format; ) {
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parents:
diff changeset
   339
#ifdef DEBUG_AUDIO
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   340
		fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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parents:
diff changeset
   341
#endif
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   342
		switch ( test_format ) {
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   343
			case AUDIO_U8:
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parents:
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   344
				if ( value & AFMT_U8 ) {
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parents:
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   345
					format = AFMT_U8;
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parents:
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   346
				}
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   347
				break;
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parents:
diff changeset
   348
			case AUDIO_S8:
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parents:
diff changeset
   349
				if ( value & AFMT_S8 ) {
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parents:
diff changeset
   350
					format = AFMT_S8;
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parents:
diff changeset
   351
				}
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parents:
diff changeset
   352
				break;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   353
			case AUDIO_S16LSB:
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parents:
diff changeset
   354
				if ( value & AFMT_S16_LE ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   355
					format = AFMT_S16_LE;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   356
				}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   357
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   358
			case AUDIO_S16MSB:
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   359
				if ( value & AFMT_S16_BE ) {
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parents:
diff changeset
   360
					format = AFMT_S16_BE;
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parents:
diff changeset
   361
				}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   362
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   363
			case AUDIO_U16LSB:
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parents:
diff changeset
   364
				if ( value & AFMT_U16_LE ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   365
					format = AFMT_U16_LE;
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parents:
diff changeset
   366
				}
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   367
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   368
			case AUDIO_U16MSB:
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parents:
diff changeset
   369
				if ( value & AFMT_U16_BE ) {
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parents:
diff changeset
   370
					format = AFMT_U16_BE;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   371
				}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   372
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   373
			default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   374
				format = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   375
				break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   376
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   377
		if ( ! format ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   378
			test_format = SDL_NextAudioFormat();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   379
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   380
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   381
	if ( format == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   382
		SDL_SetError("Couldn't find any hardware audio formats");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   383
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   384
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   385
	spec->format = test_format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   386
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   387
	/* Set the audio format */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   388
	value = format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   389
	if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   390
						(value != format) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   391
		SDL_SetError("Couldn't set audio format");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   392
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   393
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   394
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   395
	/* Set mono or stereo audio (currently only two channels supported) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   396
	stereo = (spec->channels > 1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   397
	ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   398
	if ( stereo ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   399
		spec->channels = 2;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   400
	} else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   401
		spec->channels = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   402
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   403
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   404
	/* Because some drivers don't allow setting the buffer size
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   405
	   after setting the format, we must re-open the audio device
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   406
	   once we know what format and channels are supported
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   407
	 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   408
	if ( DMA_ReopenAudio(this, audiodev, format, stereo, spec) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   409
		/* Error is set by DMA_ReopenAudio() */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   410
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   411
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   412
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   413
	/* Memory map the audio buffer */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   414
	if ( ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   415
		SDL_SetError("Couldn't get OSPACE parameters");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   416
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   417
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   418
	spec->size = info.fragsize;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   419
	spec->samples = spec->size / ((spec->format & 0xFF) / 8);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   420
	spec->samples /= spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   421
	num_buffers = info.fragstotal;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   422
	dma_len = num_buffers*spec->size;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   423
	dma_buf = (Uint8 *)mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   424
							audio_fd, 0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   425
	if ( dma_buf == MAP_FAILED ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   426
		SDL_SetError("DMA memory map failed");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   427
		dma_buf = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   428
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   429
	}
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
   430
	SDL_memset(dma_buf, spec->silence, dma_len);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   431
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   432
	/* Check to see if we need to use select() workaround */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   433
	{ char *workaround;
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
   434
		workaround = SDL_getenv("SDL_DSP_NOSELECT");
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   435
		if ( workaround ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   436
			frame_ticks = (float)(spec->samples*1000)/spec->freq;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   437
			next_frame = SDL_GetTicks()+frame_ticks;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   438
		}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   439
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   440
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   441
	/* Trigger audio playback */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   442
	value = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   443
	ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   444
	value = PCM_ENABLE_OUTPUT;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   445
	if ( ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   446
		SDL_SetError("Couldn't trigger audio output");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   447
		return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   448
	}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   449
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   450
	/* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   451
	parent = getpid();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   452
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   453
	/* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   454
	return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   455
}