--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/decoders/mp3.c	Tue Sep 18 11:01:48 2001 +0000
@@ -0,0 +1,183 @@
+/*
+ * 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
+ */
+
+/*
+ * MPEG-1 Layer 3, or simply, "MP3", decoder for SDL_sound.
+ *
+ * This driver handles all those highly compressed songs you stole through
+ *  Napster.  :)  It depends on the SMPEG library for decoding, which can
+ *  be grabbed from: http://www.lokigames.com/development/smpeg.php3
+ *
+ * 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 "smpeg.h"
+#include "SDL_sound.h"
+#include "extra_rwops.h"
+
+#define __SDL_SOUND_INTERNAL__
+#include "SDL_sound_internal.h"
+
+#if (!defined SOUND_SUPPORTS_MP3)
+#error SOUND_SUPPORTS_MP3 must be defined.
+#endif
+
+
+static int MP3_open(Sound_Sample *sample, const char *ext);
+static void MP3_close(Sound_Sample *sample);
+static Uint32 MP3_read(Sound_Sample *sample);
+
+const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3 =
+{
+    {
+        "MP3",
+        "MPEG-1 Layer 3 audio through SMPEG",
+        "Ryan C. Gordon <icculus@clutteredmind.org>",
+        "http://www.icculus.org/SDL_sound/"
+    },
+
+    MP3_open,       /* open() method       */
+    MP3_close,      /* close() method       */
+    MP3_read        /* read() method       */
+};
+
+static __inline__ void output_version(void)
+{
+    static int first_time = 1;
+
+    if (first_time)
+    {
+        SMPEG_version v;
+        SMPEG_VERSION(&v);
+        _D(("MP3: Compiled against SMPEG v%d.%d.%d.\n",
+                    v.major, v.minor, v.patch));
+        first_time = 0;
+    } /* if */
+} /* output_version */
+
+
+static int MP3_open(Sound_Sample *sample, const char *ext)
+{
+    SMPEG *smpeg;
+    SMPEG_Info smpeg_info;
+    SDL_AudioSpec spec;
+    Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
+    SDL_RWops *refCounter;
+
+    output_version();
+
+    refCounter = RWops_RWRefCounter_new(internal->rw);
+    if (refCounter == NULL)
+    {
+        _D(("MP3: Failed to create reference counting RWops.\n"));
+        return(0);
+    } /* if */
+
+    /* replace original RWops. This is safe. Honest. :) */
+    internal->rw = refCounter;
+
+    /*
+     * increment the refcount, since SMPEG will nuke the RWops if it can't
+     *  accept the contained data...
+     */
+    RWops_RWRefCounter_addRef(refCounter);
+    smpeg = SMPEG_new_rwops(refCounter, &smpeg_info, 0);
+
+    if (SMPEG_error(smpeg))
+    {
+        Sound_SetError(SMPEG_error(smpeg));
+        SMPEG_delete(smpeg);
+        return(0);
+    } /* if */
+
+    if (!smpeg_info.has_audio)
+    {
+        Sound_SetError("MP3: No audio stream found in data.");
+        SMPEG_delete(smpeg);
+        return(0);
+    } /* if */
+
+    _D(("MP3: Accepting data stream.\n"));
+    _D(("MP3: has_audio == %s.\n", smpeg_info.has_audio ? "TRUE" : "FALSE"));
+    _D(("MP3: has_video == %s.\n", smpeg_info.has_video ? "TRUE" : "FALSE"));
+    _D(("MP3: width == %d.\n", smpeg_info.width));
+    _D(("MP3: height == %d.\n", smpeg_info.height));
+    _D(("MP3: current_frame == %d.\n", smpeg_info.current_frame));
+    _D(("MP3: current_fps == %f.\n", smpeg_info.current_fps));
+    _D(("MP3: audio_string == [%s].\n", smpeg_info.audio_string));
+    _D(("MP3: audio_current_frame == %d.\n", smpeg_info.audio_current_frame));
+    _D(("MP3: current_offset == %d.\n", smpeg_info.current_offset));
+    _D(("MP3: total_size == %d.\n", smpeg_info.total_size));
+    _D(("MP3: current_time == %f.\n", smpeg_info.current_time));
+    _D(("MP3: total_time == %f.\n", smpeg_info.total_time));
+
+    SMPEG_enablevideo(smpeg, 0);
+    SMPEG_enableaudio(smpeg, 1);
+    SMPEG_loop(smpeg, 0);
+
+    SMPEG_wantedSpec(smpeg, &spec);
+    sample->actual.format = spec.format;
+    sample->actual.rate = spec.freq;
+    sample->actual.channels = spec.channels;
+    sample->flags = SOUND_SAMPLEFLAG_NONE;
+    internal->decoder_private = smpeg;
+
+    SMPEG_play(smpeg);
+    return(1);
+} /* MP3_open */
+
+
+static void MP3_close(Sound_Sample *sample)
+{
+    Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
+    SMPEG_delete((SMPEG *) internal->decoder_private);
+} /* MP3_close */
+
+
+static Uint32 MP3_read(Sound_Sample *sample)
+{
+    Uint32 retval;
+    Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
+    SMPEG *smpeg = (SMPEG *) internal->decoder_private;
+
+    retval = SMPEG_playAudio(smpeg, internal->buffer, internal->buffer_size);
+    if (retval < internal->buffer_size)
+    {
+        char *errMsg = SMPEG_error(smpeg);
+        if (errMsg == NULL)
+            sample->flags |= SOUND_SAMPLEFLAG_EOF;
+        else
+        {
+            Sound_SetError(errMsg);
+            sample->flags |= SOUND_SAMPLEFLAG_ERROR;
+        } /* else */
+    } /* if */
+
+    return(retval);
+} /* MP3_read */
+
+/* end of mp3.c ... */
+