src/audio/disk/SDL_diskaudio.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 15 Mar 2006 04:29:35 +0000
changeset 1539 84535f702874
parent 1465 8dfa9a6d69a5
child 1594 c439dad53df8
permissions -rw-r--r--
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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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    This file hacked^H^H^H^H^H^Hwritten by Ryan C. Gordon
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        (icculus@linuxgames.com)
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*/
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#include "SDL_config.h"
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/* Output raw audio data to a file. */
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#if HAVE_STDIO_H
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#include <stdio.h>
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#endif
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#include "SDL_rwops.h"
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#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "../SDL_audiomem.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_diskaudio.h"
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/* The tag name used by DISK audio */
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#define DISKAUD_DRIVER_NAME         "disk"
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/* environment variables and defaults. */
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#define DISKENVR_OUTFILE         "SDL_DISKAUDIOFILE"
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#define DISKDEFAULT_OUTFILE      "sdlaudio.raw"
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#define DISKENVR_WRITEDELAY      "SDL_DISKAUDIODELAY"
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#define DISKDEFAULT_WRITEDELAY   150
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/* Audio driver functions */
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static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void DISKAUD_WaitAudio(_THIS);
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static void DISKAUD_PlayAudio(_THIS);
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static Uint8 *DISKAUD_GetAudioBuf(_THIS);
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static void DISKAUD_CloseAudio(_THIS);
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static const char *DISKAUD_GetOutputFilename(void)
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{
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	const char *envr = SDL_getenv(DISKENVR_OUTFILE);
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	return((envr != NULL) ? envr : DISKDEFAULT_OUTFILE);
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}
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/* Audio driver bootstrap functions */
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static int DISKAUD_Available(void)
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{
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	const char *envr = SDL_getenv("SDL_AUDIODRIVER");
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	if (envr && (SDL_strcmp(envr, DISKAUD_DRIVER_NAME) == 0)) {
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		return(1);
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	}
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	return(0);
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}
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static void DISKAUD_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 *DISKAUD_CreateDevice(int devindex)
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{
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	SDL_AudioDevice *this;
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	const char *envr;
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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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	envr = SDL_getenv(DISKENVR_WRITEDELAY);
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	this->hidden->write_delay = (envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;
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	/* Set the function pointers */
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	this->OpenAudio = DISKAUD_OpenAudio;
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	this->WaitAudio = DISKAUD_WaitAudio;
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	this->PlayAudio = DISKAUD_PlayAudio;
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	this->GetAudioBuf = DISKAUD_GetAudioBuf;
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	this->CloseAudio = DISKAUD_CloseAudio;
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	this->free = DISKAUD_DeleteDevice;
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	return this;
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}
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AudioBootStrap DISKAUD_bootstrap = {
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	DISKAUD_DRIVER_NAME, "direct-to-disk audio",
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	DISKAUD_Available, DISKAUD_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 DISKAUD_WaitAudio(_THIS)
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{
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	SDL_Delay(this->hidden->write_delay);
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}
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static void DISKAUD_PlayAudio(_THIS)
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{
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	int written;
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	/* Write the audio data */
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	written = SDL_RWwrite(this->hidden->output,
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                        this->hidden->mixbuf, 1,
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                        this->hidden->mixlen);
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	/* If we couldn't write, assume fatal error for now */
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	if ( (Uint32)written != this->hidden->mixlen ) {
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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", written);
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#endif
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}
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static Uint8 *DISKAUD_GetAudioBuf(_THIS)
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{
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	return(this->hidden->mixbuf);
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}
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static void DISKAUD_CloseAudio(_THIS)
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{
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	if ( this->hidden->mixbuf != NULL ) {
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		SDL_FreeAudioMem(this->hidden->mixbuf);
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		this->hidden->mixbuf = NULL;
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	}
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	if ( this->hidden->output != NULL ) {
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		SDL_RWclose(this->hidden->output);
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		this->hidden->output = NULL;
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	}
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}
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static int DISKAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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{
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	const char *fname = DISKAUD_GetOutputFilename();
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	/* Open the audio device */
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	this->hidden->output = SDL_RWFromFile(fname, "wb");
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	if ( this->hidden->output == NULL ) {
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		return(-1);
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	}
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#if HAVE_STDIO_H
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	fprintf(stderr, "WARNING: You are using the SDL disk writer"
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                    " audio driver!\n Writing to file [%s].\n", fname);
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#endif
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	/* Allocate mixing buffer */
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	this->hidden->mixlen = spec->size;
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	this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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	if ( this->hidden->mixbuf == NULL ) {
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		return(-1);
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	}
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	SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
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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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