/*

Simple DirectMedia Layer

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

#include "../../SDL_internal.h"

#if SDL_AUDIO_DRIVER_DISK

/* Output raw audio data to a file. */

#if HAVE_STDIO_H

#include <stdio.h>

#endif

#include "SDL_rwops.h"

#include "SDL_timer.h"

#include "SDL_audio.h"

#include "../SDL_audio_c.h"

#include "SDL_diskaudio.h"

/* environment variables and defaults. */

#define DISKENVR_OUTFILE "SDL_DISKAUDIOFILE"

#define DISKDEFAULT_OUTFILE "sdlaudio.raw"

#define DISKENVR_WRITEDELAY "SDL_DISKAUDIODELAY"

#define DISKDEFAULT_WRITEDELAY 150

static const char *

DISKAUD_GetOutputFilename(const char *devname)

{

if (devname == NULL) {

devname = SDL_getenv(DISKENVR_OUTFILE);

if (devname == NULL) {

devname = DISKDEFAULT_OUTFILE;

}

}

return devname;

}

/* This function waits until it is possible to write a full sound buffer */

static void

DISKAUD_WaitDevice(_THIS)

{

SDL_Delay(this->hidden->write_delay);

}

static void

DISKAUD_PlayDevice(_THIS)

{

size_t written;

/* Write the audio data */

written = SDL_RWwrite(this->hidden->output,

this->hidden->mixbuf, 1, this->hidden->mixlen);

/* If we couldn't write, assume fatal error for now */

if (written != this->hidden->mixlen) {

SDL_OpenedAudioDeviceDisconnected(this);

}

#ifdef DEBUG_AUDIO

fprintf(stderr, "Wrote %d bytes of audio data\n", written);

#endif

}

static Uint8 *

DISKAUD_GetDeviceBuf(_THIS)

{

return (this->hidden->mixbuf);

}

static void

DISKAUD_CloseDevice(_THIS)

{

if (this->hidden->output != NULL) {

SDL_RWclose(this->hidden->output);

}

static int

DISKAUD_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)

{

/* handle != NULL means "user specified the placeholder name on the fake detected device list" */

const char *fname = DISKAUD_GetOutputFilename(handle ? NULL : devname);

const char *envr = SDL_getenv(DISKENVR_WRITEDELAY);

this->hidden = (struct SDL_PrivateAudioData *)

SDL_malloc(sizeof(*this->hidden));

if (this->hidden == NULL) {

return SDL_OutOfMemory();

}

SDL_memset(this->hidden, 0, sizeof(*this->hidden));

this->hidden->mixlen = this->spec.size;

this->hidden->write_delay =

(envr) ? SDL_atoi(envr) : DISKDEFAULT_WRITEDELAY;

/* Open the audio device */

this->hidden->output = SDL_RWFromFile(fname, "wb");

if (this->hidden->output == NULL) {

return -1;

}

/* Allocate mixing buffer */

if (this->hidden->mixbuf == NULL) {

return -1;

}

SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);

#if HAVE_STDIO_H

fprintf(stderr,

"WARNING: You are using the SDL disk writer audio driver!\n"

" Writing to file [%s].\n", fname);

#endif

/* We're ready to rock and roll. :-) */

return 0;

}

static void

DISKAUD_DetectDevices(void)

{

/* !!! FIXME: stole this literal string from DEFAULT_OUTPUT_DEVNAME in SDL_audio.c */

SDL_AddAudioDevice(SDL_FALSE, "System audio output device", (void *) 0x1);

}

static int

DISKAUD_Init(SDL_AudioDriverImpl * impl)

{

/* Set the function pointers */

impl->OpenDevice = DISKAUD_OpenDevice;

impl->WaitDevice = DISKAUD_WaitDevice;

impl->PlayDevice = DISKAUD_PlayDevice;

impl->GetDeviceBuf = DISKAUD_GetDeviceBuf;

impl->CloseDevice = DISKAUD_CloseDevice;

impl->AllowsArbitraryDeviceNames = 1;

return 1; /* this audio target is available. */

}

AudioBootStrap DISKAUD_bootstrap = {

"disk", "direct-to-disk audio", DISKAUD_Init, 1

};

#endif /* SDL_AUDIO_DRIVER_DISK */

/* vi: set ts=4 sw=4 expandtab: */