--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDL_sound.c	Mon Sep 17 18:12:03 2001 +0000
@@ -0,0 +1,520 @@
+/*
+ * 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 LICENSE in the source's root directory.
+ *
+ *  This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <ctype.h>
+
+#include "SDL.h"
+#include "SDL_sound.h"
+
+#define __SDL_SOUND_INTERNAL__
+#include "SDL_sound_internal.h"
+
+
+/* The various decoder drivers... */
+
+#if (defined SOUND_SUPPORTS_VOC)
+extern const Sound_DecoderFunctions  __Sound_DecoderFunctions_VOC;
+#endif
+
+#if (defined SOUND_SUPPORTS_RAW)
+extern const Sound_DecoderFunctions  __Sound_DecoderFunctions_RAW;
+#endif
+
+static const Sound_DecoderFunctions *decoderFuncs[] =
+{
+#if (defined SOUND_SUPPORTS_VOC)
+    &__Sound_DecoderFunctions_VOC,
+#endif
+
+#if (defined SOUND_SUPPORTS_RAW)
+    &__Sound_DecoderFunctions_RAW,
+#endif
+
+    NULL
+};
+
+
+
+/* General SDL_sound state ... */
+
+static int initialized = 0;
+static Sound_Sample *samplesList = NULL;  /* this is a linked list. */
+static const Sound_DecoderInfo **available_decoders = NULL;
+
+
+/* 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;
+    BAIL_IF_MACRO(initialized, ERR_IS_INITIALIZED, 0);
+    samplesList = NULL;
+
+    SDL_Init(SDL_INIT_AUDIO);
+
+    for (i = 0; decoderFuncs[i] != NULL; i++)
+        ; /* do nothing. */
+
+    i++;
+    available_decoders = (const Sound_DecoderInfo **)
+                            malloc(i * sizeof (Sound_DecoderInfo *));
+    BAIL_IF_MACRO(available_decoders == NULL, ERR_OUT_OF_MEMORY, 0);
+
+    for (i = 0; decoderFuncs[i] != NULL; i++)
+        available_decoders[i] = &decoderFuncs[i]->info;
+
+    initialized = 1;
+    return(1);
+} /* Sound_Init */
+
+
+int Sound_Quit(void)
+{
+    BAIL_IF_MACRO(!initialized, ERR_NOT_INITIALIZED, 0);
+
+    while (((volatile Sound_Sample *) samplesList) != NULL)
+        Sound_FreeSample(samplesList);
+
+    if (available_decoders != NULL)
+        free(available_decoders);
+    available_decoders = NULL;
+
+    initialized = 0;
+
+    return(1);
+} /* Sound_Quit */
+
+
+const Sound_DecoderInfo **Sound_AvailableDecoders(void)
+{
+    return(available_decoders);  /* READ. ONLY. */
+} /* Sound_AvailableDecoders */
+
+
+const char *Sound_GetError(void)
+{
+    return(SDL_GetError());
+} /* Sound_GetError */
+
+
+void Sound_ClearError(void)
+{
+    SDL_ClearError();
+} /* Sound_ClearError */
+
+
+/*
+ * This is declared in the internal header.
+ */
+void Sound_SetError(const char *err)
+{
+    if (err != NULL)
+        SDL_SetError(err);
+} /* Sound_SetError */
+
+
+/*
+ * -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;
+
+    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 */
+
+
+/*
+ * 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.
+ *
+ *  !!! FIXME: This is big, ugly, nasty, and smelly.
+ */
+static int init_sample(const Sound_DecoderFunctions *funcs,
+                        Sound_Sample *sample, const char *ext,
+                        Sound_AudioInfo *_desired)
+{
+    Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
+    int pos = SDL_RWtell(internal->rw);  /* !!! FIXME: Int? Really? */
+    Sound_AudioInfo desired;
+
+        /* 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 (SDL_BuildAudioCVT(&internal->sdlcvt,
+                          sample->actual.format,
+                          sample->actual.channels,
+                          (int) sample->actual.rate,   /* !!! FIXME: Int? Really? */
+                          desired.format,
+                          desired.channels,
+                          (int) desired.rate) == -1) /* !!! FIXME: Int? Really? */
+    {
+        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 samplesList... */
+    if (samplesList != NULL)
+    {
+        internal->next = samplesList;
+        if (samplesList != NULL)
+            internal->prev = sample;
+    } /* if */
+    samplesList = sample;
+
+    return(1);
+} /* init_sample */
+
+
+Sound_Sample *Sound_NewSample(SDL_RWops *rw, const char *ext,
+                              Sound_AudioInfo *desired, Uint32 bSize)
+{
+    size_t i;
+    Sound_Sample *retval;
+
+    /* 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 (i = 0; decoderFuncs[i] != NULL; i++)
+        {
+            const char *decoderExt = decoderFuncs[i]->info.extension;
+            if (__Sound_strcasecmp(decoderExt, ext) == 0)
+            {
+                if (init_sample(decoderFuncs[i], retval, ext, desired))
+                    return(retval);
+            } /* if */
+        } /* for */
+    } /* if */
+
+    /* no direct extension match? Try everything we've got... */
+    for (i = 0; decoderFuncs[i] != NULL; i++)
+    {
+        if (init_sample(decoderFuncs[i], retval, ext, desired))
+            return(retval);
+    } /* 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;
+
+    internal->funcs->close(sample);
+
+    /* update the samplesList... */
+    if (internal->prev != NULL)
+    {
+        Sound_SampleInternal *prevInternal;
+        prevInternal = (Sound_SampleInternal *) internal->prev->opaque;
+        prevInternal->next = internal->next;
+    } /* if */
+    else
+    {
+        assert(samplesList == sample);
+        samplesList = internal->next;
+    } /* else */
+
+    if (internal->next != NULL)
+    {
+        Sound_SampleInternal *nextInternal;
+        nextInternal = (Sound_SampleInternal *) internal->next->opaque;
+        nextInternal->prev = internal->prev;
+    } /* if */
+
+    /* nuke it... */
+    if (internal->rw != NULL)  /* this condition is a "just in case" thing. */
+        SDL_RWclose(internal->rw);
+    assert(internal->buffer != NULL);
+    if (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 (internal->sdlcvt.needed)
+    {
+        internal->sdlcvt.len = retval;
+        SDL_ConvertAudio(&internal->sdlcvt);
+        retval *= internal->sdlcvt.len_mult;
+    } /* 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);
+
+    internal = (Sound_SampleInternal *) sample->opaque;
+
+    while ( ((sample->flags & SOUND_SAMPLEFLAG_EOF) == 0) &&
+            ((sample->flags & SOUND_SAMPLEFLAG_ERROR) == 0) )
+    {
+        void *ptr = realloc(buf, newBufSize + sample->buffer_size);
+        if (ptr == NULL)
+        {
+            sample->flags |= SOUND_SAMPLEFLAG_ERROR;
+            Sound_SetError(ERR_OUT_OF_MEMORY);
+        } /* if */
+        else
+        {
+            Uint32 br = Sound_Decode(sample);
+            memcpy( ((char *) buf) + newBufSize, sample->buffer, br );
+            newBufSize += br;
+        } /* else */
+    } /* while */
+
+    free(sample->buffer);
+    sample->buffer = internal->buffer = internal->sdlcvt.buf = buf;
+    sample->buffer_size = newBufSize;
+    internal->buffer_size = newBufSize / internal->sdlcvt.len_mult;
+    internal->sdlcvt.len_mult = internal->buffer_size;
+
+    return(newBufSize);
+} /* Sound_DecodeAll */
+
+
+/* end of SDL_sound.c ... */
+