src/audio/esd/SDL_esdaudio.c
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001  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@devolution.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 an ESD network stream mixing buffer */
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#ifdef ESD_SUPPORT
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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 <signal.h>
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#include <unistd.h>
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#include <esd.h>
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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_esdaudio.h"
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/* The tag name used by ESD audio */
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#define ESD_DRIVER_NAME		"esd"
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/* Audio driver functions */
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static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void ESD_WaitAudio(_THIS);
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static void ESD_PlayAudio(_THIS);
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static Uint8 *ESD_GetAudioBuf(_THIS);
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static void ESD_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 connection;
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	int available;
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	available = 0;
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	connection = esd_open_sound(NULL);
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	if ( connection >= 0 ) {
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		available = 1;
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		esd_close(connection);
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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 = ESD_OpenAudio;
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	this->WaitAudio = ESD_WaitAudio;
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	this->PlayAudio = ESD_PlayAudio;
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	this->GetAudioBuf = ESD_GetAudioBuf;
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	this->CloseAudio = ESD_CloseAudio;
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	this->free = Audio_DeleteDevice;
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	return this;
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}
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AudioBootStrap ESD_bootstrap = {
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	ESD_DRIVER_NAME, "Enlightened Sound Daemon",
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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 ESD_WaitAudio(_THIS)
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{
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	Sint32 ticks;
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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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	/* Use timer for general audio synchronization */
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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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}
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static void ESD_PlayAudio(_THIS)
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{
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	int written;
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	/* Write the audio data, checking for EAGAIN on broken audio drivers */
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	do {
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		written = write(audio_fd, mixbuf, mixlen);
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		if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) {
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			SDL_Delay(1);	/* Let a little CPU time go by */
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		}
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	} while ( (written < 0) && 
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	          ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) );
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	/* Set the next write frame */
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	next_frame += frame_ticks;
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	/* If we couldn't write, assume fatal error for now */
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	if ( written < 0 ) {
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		this->enabled = 0;
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	}
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}
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static Uint8 *ESD_GetAudioBuf(_THIS)
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{
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	return(mixbuf);
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}
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static void ESD_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_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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/* Try to get the name of the program */
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static char *get_progname(void)
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{
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	char *progname = NULL;
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#ifdef linux
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	FILE *fp;
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	static char temp[BUFSIZ];
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	sprintf(temp, "/proc/%d/cmdline", getpid());
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	fp = fopen(temp, "r");
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	if ( fp != NULL ) {
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		if ( fgets(temp, sizeof(temp)-1, fp) ) {
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			progname = strrchr(temp, '/');
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			if ( progname == NULL ) {
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				progname = temp;
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			} else {
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				progname = progname+1;
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			}
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		}
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		fclose(fp);
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	}
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#endif
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	return(progname);
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}
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static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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{
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	esd_format_t format;
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	/* Convert audio spec to the ESD audio format */
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	format = (ESD_STREAM | ESD_PLAY);
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	switch ( spec->format & 0xFF ) {
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		case 8:
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			format |= ESD_BITS8;
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			break;
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		case 16:
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			format |= ESD_BITS16;
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			break;
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		default:
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			SDL_SetError("Unsupported ESD audio format");
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			return(-1);
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	}
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	if ( spec->channels == 1 ) {
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		format |= ESD_MONO;
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	} else {
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		format |= ESD_STEREO;
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	}
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#if 0
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	spec->samples = ESD_BUF_SIZE;	/* Darn, no way to change this yet */
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#endif
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	/* Open a connection to the ESD audio server */
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	audio_fd = esd_play_stream(format, spec->freq, NULL, get_progname());
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	if ( audio_fd < 0 ) {
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		SDL_SetError("Couldn't open ESD connection");
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		return(-1);
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	}
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	/* Calculate the final parameters for this audio specification */
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	SDL_CalculateAudioSpec(spec);
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	frame_ticks = (float)(spec->samples*1000)/spec->freq;
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	next_frame = SDL_GetTicks()+frame_ticks;
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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 ) {
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		return(-1);
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	}
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	memset(mixbuf, spec->silence, spec->size);
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	/* Get the parent process id (we're the parent of the audio thread) */
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	parent = getpid();
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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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#endif /* ESD_SUPPORT */