/*

* SDL_sound -- An abstract sound format decoding API.

* Copyright (C) 2001 Ryan C. Gordon.

*

* This library is free software; you can redistribute it and/or

* modify it under the terms of the GNU Lesser General Public

* License as published by the Free Software Foundation; either

* version 2.1 of the License, or (at your option) any later version.

*

* This library is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public

* License along with this library; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

*/

/**

* This file implements the core API, which is relatively simple.

* The real meat of SDL_sound is in the decoders directory.

*

* Documentation is in SDL_sound.h ... It's verbose, honest. :)

*

* Please see the file COPYING in the source's root directory.

*

* This file written by Ryan C. Gordon. (icculus@icculus.org)

*/

#if HAVE_CONFIG_H

# include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <ctype.h>

#include "SDL.h"

#include "SDL_thread.h"

#include "SDL_sound.h"

#define __SDL_SOUND_INTERNAL__

#include "SDL_sound_internal.h"

/* The various decoder drivers... */

/* All these externs may be missing; we check SOUND_SUPPORTS_xxx before use. */

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_SMPEG;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_MPGLIB;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_MIKMOD;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_MODPLUG;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_WAV;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_AIFF;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_AU;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_OGG;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_RAW;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_SHN;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_MIDI;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_QuickTime;

extern const Sound_DecoderFunctions __Sound_DecoderFunctions_SPEEX;

typedef struct

{

int available;

const Sound_DecoderFunctions *funcs;

} decoder_element;

static decoder_element decoders[] =

{

#if (defined SOUND_SUPPORTS_SMPEG)

{ 0, &__Sound_DecoderFunctions_SMPEG },

#endif

#if (defined SOUND_SUPPORTS_MPGLIB)

{ 0, &__Sound_DecoderFunctions_MPGLIB },

#endif

#if (defined SOUND_SUPPORTS_MODPLUG)

{ 0, &__Sound_DecoderFunctions_MODPLUG },

#endif

#if (defined SOUND_SUPPORTS_MIKMOD)

{ 0, &__Sound_DecoderFunctions_MIKMOD },

#endif

#if (defined SOUND_SUPPORTS_WAV)

{ 0, &__Sound_DecoderFunctions_WAV },

#endif

#if (defined SOUND_SUPPORTS_AIFF)

{ 0, &__Sound_DecoderFunctions_AIFF },

#endif

#if (defined SOUND_SUPPORTS_AU)

{ 0, &__Sound_DecoderFunctions_AU },

#endif

#if (defined SOUND_SUPPORTS_OGG)

{ 0, &__Sound_DecoderFunctions_OGG },

#endif

#if (defined SOUND_SUPPORTS_VOC)

{ 0, &__Sound_DecoderFunctions_VOC },

#endif

#if (defined SOUND_SUPPORTS_RAW)

{ 0, &__Sound_DecoderFunctions_RAW },

#endif

#if (defined SOUND_SUPPORTS_SHN)

{ 0, &__Sound_DecoderFunctions_SHN },

#endif

#if (defined SOUND_SUPPORTS_FLAC)

{ 0, &__Sound_DecoderFunctions_FLAC },

#endif

#if (defined SOUND_SUPPORTS_MIDI)

{ 0, &__Sound_DecoderFunctions_MIDI },

#endif

#if (defined SOUND_SUPPORTS_QUICKTIME)

{ 0, &__Sound_DecoderFunctions_QuickTime },

#endif

#if (defined SOUND_SUPPORTS_SPEEX)

{ 0, &__Sound_DecoderFunctions_SPEEX },

#endif

{ 0, NULL }

};

/* General SDL_sound state ... */

typedef struct __SOUND_ERRMSGTYPE__

} ErrMsg;

static ErrMsg *error_msgs = NULL;

static SDL_mutex *errorlist_mutex = NULL;

static Sound_Sample *sample_list = NULL; /* this is a linked list. */

static SDL_mutex *samplelist_mutex = NULL;

static const Sound_DecoderInfo **available_decoders = NULL;

static int initialized = 0;

/* functions ... */

void Sound_GetLinkedVersion(Sound_Version *ver)

{

if (ver != NULL)

{

ver->major = SOUND_VER_MAJOR;

ver->minor = SOUND_VER_MINOR;

ver->patch = SOUND_VER_PATCH;

} /* if */

} /* Sound_GetLinkedVersion */

int Sound_Init(void)

{

size_t i;

size_t pos = 0;

size_t total = sizeof (decoders) / sizeof (decoders[0]);

BAIL_IF_MACRO(initialized, ERR_IS_INITIALIZED, 0);

sample_list = NULL;

error_msgs = NULL;

available_decoders = (const Sound_DecoderInfo **)

malloc((total) * sizeof (Sound_DecoderInfo *));

BAIL_IF_MACRO(available_decoders == NULL, ERR_OUT_OF_MEMORY, 0);

SDL_InitSubSystem(SDL_INIT_AUDIO);

errorlist_mutex = SDL_CreateMutex();

samplelist_mutex = SDL_CreateMutex();

for (i = 0; decoders[i].funcs != NULL; i++)

{

decoders[i].available = decoders[i].funcs->init();

if (decoders[i].available)

{

available_decoders[pos] = &(decoders[i].funcs->info);

pos++;

} /* if */

} /* for */

available_decoders[pos] = NULL;

initialized = 1;

return(1);

} /* Sound_Init */

int Sound_Quit(void)

{

ErrMsg *err;

ErrMsg *nexterr = NULL;

size_t i;

BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);

while (((volatile Sound_Sample *) sample_list) != NULL)

Sound_FreeSample(sample_list);

initialized = 0;

SDL_DestroyMutex(samplelist_mutex);

samplelist_mutex = NULL;

sample_list = NULL;

for (i = 0; decoders[i].funcs != NULL; i++)

{

if (decoders[i].available)

{

decoders[i].funcs->quit();

decoders[i].available = 0;

} /* if */

} /* for */

if (available_decoders != NULL)

free((void *) available_decoders);

available_decoders = NULL;

/* clean up error state for each thread... */

SDL_LockMutex(errorlist_mutex);

for (err = error_msgs; err != NULL; err = nexterr)

{

nexterr = err->next;

free(err);

} /* for */

error_msgs = NULL;

SDL_UnlockMutex(errorlist_mutex);

SDL_DestroyMutex(errorlist_mutex);

errorlist_mutex = NULL;

return(1);

} /* Sound_Quit */

const Sound_DecoderInfo **Sound_AvailableDecoders(void)

{

return(available_decoders); /* READ. ONLY. */

} /* Sound_AvailableDecoders */

static ErrMsg *findErrorForCurrentThread(void)

{

ErrMsg *i;

Uint32 tid;

if (error_msgs != NULL)

{

tid = SDL_ThreadID();

SDL_LockMutex(errorlist_mutex);

for (i = error_msgs; i != NULL; i = i->next)

{

if (i->tid == tid)

{

SDL_UnlockMutex(errorlist_mutex);

return(i);

} /* if */

} /* for */

SDL_UnlockMutex(errorlist_mutex);

} /* if */

return(NULL); /* no error available. */

} /* findErrorForCurrentThread */

const char *Sound_GetError(void)

{

const char *retval = NULL;

ErrMsg *err;

if (!initialized)

return(ERR_NOT_INITIALIZED);

err = findErrorForCurrentThread();

if ((err != NULL) && (err->error_available))

{

retval = err->error_string;

err->error_available = 0;

} /* if */

return(retval);

} /* Sound_GetError */

void Sound_ClearError(void)

{

ErrMsg *err;

if (!initialized)

return;

err = findErrorForCurrentThread();

if (err != NULL)

err->error_available = 0;

} /* Sound_ClearError */

/*

* This is declared in the internal header.

*/

void __Sound_SetError(const char *str)

{

ErrMsg *err;

if (str == NULL)

return;

SNDDBG(("__Sound_SetError(\"%s\");%s\n", str,

(initialized) ? "" : " [NOT INITIALIZED!]"));

if (!initialized)

return;

err = findErrorForCurrentThread();

if (err == NULL)

{

err = (ErrMsg *) malloc(sizeof (ErrMsg));

if (err == NULL)

return; /* uhh...? */

memset((void *) err, '\0', sizeof (ErrMsg));

err->tid = SDL_ThreadID();

SDL_LockMutex(errorlist_mutex);

err->next = error_msgs;

error_msgs = err;

SDL_UnlockMutex(errorlist_mutex);

} /* if */

err->error_available = 1;

strncpy(err->error_string, str, sizeof (err->error_string));

err->error_string[sizeof (err->error_string) - 1] = '\0';

} /* __Sound_SetError */

Uint32 __Sound_convertMsToBytePos(Sound_AudioInfo *info, Uint32 ms)

{

/* "frames" == "sample frames" */

float frames_per_ms = ((float) info->rate) / 1000.0f;

Uint32 frame_offset = (Uint32) (frames_per_ms * ((float) ms));

Uint32 frame_size = (Uint32) ((info->format & 0xFF) / 8) * info->channels;

return(frame_offset * frame_size);

} /* __Sound_convertMsToBytePos */

/*

* -ansi and -pedantic flags prevent use of strcasecmp() on Linux, and

* I honestly don't want to mess around with figuring out if a given

* platform has "strcasecmp", "stricmp", or

* "compare_two_damned_strings_case_insensitive", which I hear is in the

* next release of Carbon. :) This is exported so decoders may use it if

* they like.

*/

int __Sound_strcasecmp(const char *x, const char *y)

{

int ux, uy;

if (x == y) /* same pointer? Both NULL? */

return(0);

if (x == NULL)

return(-1);

if (y == NULL)

return(1);

do

{

ux = toupper((int) *x);

uy = toupper((int) *y);

if (ux > uy)

return(1);

else if (ux < uy)

return(-1);

x++;

y++;

} while ((ux) && (uy));

return(0);

} /* __Sound_strcasecmp */

/*

* Allocate a Sound_Sample, and fill in most of its fields. Those that need

* to be filled in later, by a decoder, will be initialized to zero.

*/

static Sound_Sample *alloc_sample(SDL_RWops *rw, Sound_AudioInfo *desired,

Uint32 bufferSize)

{

Sound_Sample *retval = malloc(sizeof (Sound_Sample));

Sound_SampleInternal *internal = malloc(sizeof (Sound_SampleInternal));

if ((retval == NULL) || (internal == NULL))

{

__Sound_SetError(ERR_OUT_OF_MEMORY);

if (retval)

free(retval);

if (internal)

free(internal);

return(NULL);

} /* if */

memset(retval, '\0', sizeof (Sound_Sample));

memset(internal, '\0', sizeof (Sound_SampleInternal));

assert(bufferSize > 0);

retval->buffer = malloc(bufferSize); /* pure ugly. */

if (!retval->buffer)

{

__Sound_SetError(ERR_OUT_OF_MEMORY);

free(internal);

free(retval);

return(NULL);

} /* if */

memset(retval->buffer, '\0', bufferSize);

retval->buffer_size = bufferSize;

if (desired != NULL)

memcpy(&retval->desired, desired, sizeof (Sound_AudioInfo));

internal->rw = rw;

retval->opaque = internal;

return(retval);

} /* alloc_sample */

#if (defined DEBUG_CHATTER)

static __inline__ const char *fmt_to_str(Uint16 fmt)

{

switch(fmt)

{

case AUDIO_U8:

return("U8");

case AUDIO_S8:

return("S8");

case AUDIO_U16LSB:

return("U16LSB");

case AUDIO_S16LSB:

return("S16LSB");

case AUDIO_U16MSB:

return("U16MSB");

case AUDIO_S16MSB:

return("S16MSB");

} /* switch */

return("Unknown");

} /* fmt_to_str */

#endif

/*

* The bulk of the Sound_NewSample() work is done here...

* Ask the specified decoder to handle the data in (rw), and if

* so, construct the Sound_Sample. Otherwise, try to wind (rw)'s stream

* back to where it was, and return false.

*/

static int init_sample(const Sound_DecoderFunctions *funcs,

Sound_Sample *sample, const char *ext,

Sound_AudioInfo *_desired)

{

Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;

Sound_AudioInfo desired;

int pos = SDL_RWtell(internal->rw);

/* fill in the funcs for this decoder... */

sample->decoder = &funcs->info;

internal->funcs = funcs;

if (!funcs->open(sample, ext))

{

SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */

return(0);

} /* if */

/* success; we've got a decoder! */

/* Now we need to set up the conversion buffer... */

memcpy(&desired, (_desired != NULL) ? _desired : &sample->actual,

sizeof (Sound_AudioInfo));

if (desired.format == 0)

desired.format = sample->actual.format;

if (desired.channels == 0)

desired.channels = sample->actual.channels;

if (desired.rate == 0)

desired.rate = sample->actual.rate;

if (Sound_BuildAudioCVT(&internal->sdlcvt,

sample->actual.format,

sample->actual.channels,

sample->actual.rate,

desired.format,

desired.channels,

desired.rate,

sample->buffer_size) == -1)

{

__Sound_SetError(SDL_GetError());

funcs->close(sample);

SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */

return(0);

} /* if */

if (internal->sdlcvt.len_mult > 1)

{

void *rc = realloc(sample->buffer,

sample->buffer_size * internal->sdlcvt.len_mult);

if (rc == NULL)

{

funcs->close(sample);

SDL_RWseek(internal->rw, pos, SEEK_SET); /* set for next try... */

return(0);

} /* if */

sample->buffer = rc;

} /* if */

/* these pointers are all one and the same. */

memcpy(&sample->desired, &desired, sizeof (Sound_AudioInfo));

internal->sdlcvt.buf = internal->buffer = sample->buffer;

internal->buffer_size = sample->buffer_size / internal->sdlcvt.len_mult;

internal->sdlcvt.len = internal->buffer_size;

/* Prepend our new Sound_Sample to the sample_list... */

SDL_LockMutex(samplelist_mutex);

internal->next = sample_list;

if (sample_list != NULL)

((Sound_SampleInternal *) sample_list->opaque)->prev = sample;

sample_list = sample;

SDL_UnlockMutex(samplelist_mutex);

SNDDBG(("New sample DESIRED format: %s format, %d rate, %d channels.\n",

fmt_to_str(sample->desired.format),

sample->desired.rate,

sample->desired.channels));

SNDDBG(("New sample ACTUAL format: %s format, %d rate, %d channels.\n",

fmt_to_str(sample->actual.format),

sample->actual.rate,

sample->actual.channels));

SNDDBG(("On-the-fly conversion: %s.\n",

internal->sdlcvt.needed ? "ENABLED" : "DISABLED"));

return(1);

} /* init_sample */

Sound_Sample *Sound_NewSample(SDL_RWops *rw, const char *ext,

Sound_AudioInfo *desired, Uint32 bSize)

{

Sound_Sample *retval;

decoder_element *decoder;

/* sanity checks. */

BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, NULL);

BAIL_IF_MACRO(rw == NULL, ERR_INVALID_ARGUMENT, NULL);

retval = alloc_sample(rw, desired, bSize);

if (!retval)

return(NULL); /* alloc_sample() sets error message... */

if (ext != NULL)

{

for (decoder = &decoders[0]; decoder->funcs != NULL; decoder++)

{

if (decoder->available)

{

const char **decoderExt = decoder->funcs->info.extensions;

while (*decoderExt)

{

if (__Sound_strcasecmp(*decoderExt, ext) == 0)

{

if (init_sample(decoder->funcs, retval, ext, desired))

return(retval);

break; /* done with this decoder either way. */

} /* if */

decoderExt++;

} /* while */

} /* if */

} /* for */

} /* if */

/* no direct extension match? Try everything we've got... */

for (decoder = &decoders[0]; decoder->funcs != NULL; decoder++)

{

if (decoder->available)

{

int should_try = 1;

const char **decoderExt = decoder->funcs->info.extensions;

/* skip if we would have tried decoder above... */

while (*decoderExt)

{

if (__Sound_strcasecmp(*decoderExt, ext) == 0)

{

should_try = 0;

break;

} /* if */

decoderExt++;

} /* while */

if (should_try)

{

if (init_sample(decoder->funcs, retval, ext, desired))

return(retval);

} /* if */

} /* if */

} /* for */

/* nothing could handle the sound data... */

free(retval->opaque);

if (retval->buffer != NULL)

free(retval->buffer);

free(retval);

SDL_RWclose(rw);

__Sound_SetError(ERR_UNSUPPORTED_FORMAT);

return(NULL);

} /* Sound_NewSample */

Sound_Sample *Sound_NewSampleFromFile(const char *filename,

Sound_AudioInfo *desired,

Uint32 bufferSize)

{

const char *ext;

SDL_RWops *rw;

BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, NULL);

BAIL_IF_MACRO(filename == NULL, ERR_INVALID_ARGUMENT, NULL);

ext = strrchr(filename, '.');

rw = SDL_RWFromFile(filename, "rb");

BAIL_IF_MACRO(rw == NULL, SDL_GetError(), NULL);

if (ext != NULL)

ext++;

return(Sound_NewSample(rw, ext, desired, bufferSize));

} /* Sound_NewSampleFromFile */

void Sound_FreeSample(Sound_Sample *sample)

{

Sound_SampleInternal *internal;

if (!initialized)

{

__Sound_SetError(ERR_NOT_INITIALIZED);

return;

} /* if */

if (sample == NULL)

{

__Sound_SetError(ERR_INVALID_ARGUMENT);

return;

} /* if */

internal = (Sound_SampleInternal *) sample->opaque;

SDL_LockMutex(samplelist_mutex);

/* update the sample_list... */

if (internal->prev != NULL)

{

Sound_SampleInternal *prevInternal;

prevInternal = (Sound_SampleInternal *) internal->prev->opaque;

prevInternal->next = internal->next;

} /* if */

else

{

assert(sample_list == sample);

sample_list = internal->next;

} /* else */

if (internal->next != NULL)

{

Sound_SampleInternal *nextInternal;

nextInternal = (Sound_SampleInternal *) internal->next->opaque;

nextInternal->prev = internal->prev;

} /* if */

SDL_UnlockMutex(samplelist_mutex);

/* nuke it... */

internal->funcs->close(sample);

if (internal->rw != NULL) /* this condition is a "just in case" thing. */

SDL_RWclose(internal->rw);

if ((internal->buffer != NULL) && (internal->buffer != sample->buffer))

free(internal->buffer);

free(internal);

if (sample->buffer != NULL)

free(sample->buffer);

free(sample);

} /* Sound_FreeSample */

int Sound_SetBufferSize(Sound_Sample *sample, Uint32 newSize)

{

void *newBuf = NULL;

Sound_SampleInternal *internal = NULL;

BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);

BAIL_IF_MACRO(sample == NULL, ERR_INVALID_ARGUMENT, 0);

internal = ((Sound_SampleInternal *) sample->opaque);

newBuf = realloc(sample->buffer, newSize * internal->sdlcvt.len_mult);

BAIL_IF_MACRO(newBuf == NULL, ERR_OUT_OF_MEMORY, 0);

internal->sdlcvt.buf = internal->buffer = sample->buffer = newBuf;

sample->buffer_size = newSize;

internal->buffer_size = newSize / internal->sdlcvt.len_mult;

internal->sdlcvt.len = internal->buffer_size;

return(1);

} /* Sound_SetBufferSize */

Uint32 Sound_Decode(Sound_Sample *sample)

{

Sound_SampleInternal *internal = NULL;

Uint32 retval = 0;

/* a boatload of sanity checks... */

BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);

BAIL_IF_MACRO(sample == NULL, ERR_INVALID_ARGUMENT, 0);

BAIL_IF_MACRO(sample->flags & SOUND_SAMPLEFLAG_ERROR, ERR_PREV_ERROR, 0);

BAIL_IF_MACRO(sample->flags & SOUND_SAMPLEFLAG_EOF, ERR_PREV_EOF, 0);

internal = (Sound_SampleInternal *) sample->opaque;

assert(sample->buffer != NULL);

assert(sample->buffer_size > 0);

assert(internal->buffer != NULL);

assert(internal->buffer_size > 0);

/* reset EAGAIN. Decoder can flip it back on if it needs to. */

sample->flags &= ~SOUND_SAMPLEFLAG_EAGAIN;

retval = internal->funcs->read(sample);

if (retval > 0 && internal->sdlcvt.needed)

{

internal->sdlcvt.len = retval;

Sound_ConvertAudio(&internal->sdlcvt);

retval = internal->sdlcvt.len_cvt;

} /* if */

return(retval);

} /* Sound_Decode */

Uint32 Sound_DecodeAll(Sound_Sample *sample)

{

Sound_SampleInternal *internal = NULL;

void *buf = NULL;

Uint32 newBufSize = 0;

BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);

BAIL_IF_MACRO(sample->flags & SOUND_SAMPLEFLAG_EOF, ERR_PREV_EOF, 0);

BAIL_IF_MACRO(sample->flags & SOUND_SAMPLEFLAG_ERROR, ERR_PREV_ERROR, 0);

internal = (Sound_SampleInternal *) sample->opaque;

while ( ((sample->flags & SOUND_SAMPLEFLAG_EOF) == 0) &&

((sample->flags & SOUND_SAMPLEFLAG_ERROR) == 0) )

{

Uint32 br = Sound_Decode(sample);

void *ptr = realloc(buf, newBufSize + br);

if (ptr == NULL)

{

sample->flags |= SOUND_SAMPLEFLAG_ERROR;

__Sound_SetError(ERR_OUT_OF_MEMORY);

} /* if */

else

{

buf = ptr;

memcpy( ((char *) buf) + newBufSize, sample->buffer, br );

newBufSize += br;

} /* else */

} /* while */

if (buf == NULL) /* ...in case first call to realloc() fails... */

return(sample->buffer_size);

if (internal->buffer != sample->buffer)

free(internal->buffer);

free(sample->buffer);

internal->sdlcvt.buf = internal->buffer = sample->buffer = buf;

sample->buffer_size = newBufSize;

internal->buffer_size = newBufSize / internal->sdlcvt.len_mult;

internal->sdlcvt.len = internal->buffer_size;

return(newBufSize);

} /* Sound_DecodeAll */

int Sound_Rewind(Sound_Sample *sample)

{

Sound_SampleInternal *internal;

BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);

internal = (Sound_SampleInternal *) sample->opaque;

if (!internal->funcs->rewind(sample))

{

sample->flags |= SOUND_SAMPLEFLAG_ERROR;

return(0);

} /* if */

sample->flags &= ~SOUND_SAMPLEFLAG_EAGAIN;

sample->flags &= ~SOUND_SAMPLEFLAG_ERROR;

sample->flags &= ~SOUND_SAMPLEFLAG_EOF;

return(1);

} /* Sound_Rewind */

int Sound_Seek(Sound_Sample *sample, Uint32 ms)

{

Sound_SampleInternal *internal;

BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);

if (!(sample->flags & SOUND_SAMPLEFLAG_CANSEEK))

BAIL_MACRO(ERR_CANNOT_SEEK, 0);

internal = (Sound_SampleInternal *) sample->opaque;

BAIL_IF_MACRO(!internal->funcs->seek(sample, ms), NULL, 0);

sample->flags &= ~SOUND_SAMPLEFLAG_EAGAIN;

sample->flags &= ~SOUND_SAMPLEFLAG_ERROR;

sample->flags &= ~SOUND_SAMPLEFLAG_EOF;

return(1);

} /* Sound_Rewind */

/* end of SDL_sound.c ... */