annotate decoders/mpglib.c @ 358:f11c10ffa31a

Fixed some debug messages.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 11 Jun 2002 23:33:02 +0000
parents 069ce624d6cf
children cbb15ecf423a
rev   line source
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
1 /*
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
2 * SDL_sound -- An abstract sound format decoding API.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
3 * Copyright (C) 2001 Ryan C. Gordon.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
4 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
5 * This library is free software; you can redistribute it and/or
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
6 * modify it under the terms of the GNU Lesser General Public
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
7 * License as published by the Free Software Foundation; either
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
8 * version 2.1 of the License, or (at your option) any later version.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
9 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
10 * This library is distributed in the hope that it will be useful,
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
13 * Lesser General Public License for more details.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
14 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
15 * You should have received a copy of the GNU Lesser General Public
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
16 * License along with this library; if not, write to the Free Software
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
18 */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
19
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
20 /*
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
21 * MPGLIB decoder for SDL_sound. This is a very lightweight MP3 decoder,
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
22 * which is included with the SDL_sound source, so that it doesn't rely on
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
23 * unnecessary external libraries.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
24 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
25 * The SMPEG decoder plays back more forms of MPEGs, and may behave better or
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
26 * worse under various conditions. mpglib is (apparently) more efficient than
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
27 * SMPEG, and, again, doesn't need an external library. You should test both
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
28 * decoders and use what you find works best for you.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
29 *
306
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
30 * mpglib is an LGPL'd portion of mpg123, which can be found in its original
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
31 * form at: http://www.mpg123.de/
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
32 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
33 * Please see the file COPYING in the source's root directory. The included
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
34 * source code for mpglib falls under the LGPL, which is the same license as
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
35 * SDL_sound (so you can consider it a single work).
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
36 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
37 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
38 */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
39
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
40 #if HAVE_CONFIG_H
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
41 # include <config.h>
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
42 #endif
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
43
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
44 #ifdef SOUND_SUPPORTS_MPGLIB
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
45
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
46 #include <stdio.h>
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
47 #include <stdlib.h>
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
48 #include <string.h>
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
49 #include <assert.h>
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
50 #include "mpglib/mpg123_sdlsound.h"
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
51 #include "mpglib/mpglib_sdlsound.h"
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
52
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
53 #include "SDL_sound.h"
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
54
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
55 #define __SDL_SOUND_INTERNAL__
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
56 #include "SDL_sound_internal.h"
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
57
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
58 static int MPGLIB_init(void);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
59 static void MPGLIB_quit(void);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
60 static int MPGLIB_open(Sound_Sample *sample, const char *ext);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
61 static void MPGLIB_close(Sound_Sample *sample);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
62 static Uint32 MPGLIB_read(Sound_Sample *sample);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
63 static int MPGLIB_rewind(Sound_Sample *sample);
306
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
64 static int MPGLIB_seek(Sound_Sample *sample, Uint32 ms);
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
65
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
66 static const char *extensions_mpglib[] = { "MP3", NULL };
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
67 const Sound_DecoderFunctions __Sound_DecoderFunctions_MPGLIB =
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
68 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
69 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
70 extensions_mpglib,
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
71 "MP3 decoding via internal mpglib",
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
72 "Ryan C. Gordon <icculus@clutteredmind.org>",
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
73 "http://www.icculus.org/SDL_sound/"
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
74 },
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
75
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
76 MPGLIB_init, /* init() method */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
77 MPGLIB_quit, /* quit() method */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
78 MPGLIB_open, /* open() method */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
79 MPGLIB_close, /* close() method */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
80 MPGLIB_read, /* read() method */
306
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
81 MPGLIB_rewind, /* rewind() method */
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
82 MPGLIB_seek /* seek() method */
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
83 };
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
84
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
85
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
86 /* this is what we store in our internal->decoder_private field... */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
87 typedef struct
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
88 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
89 struct mpstr mp;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
90 Uint8 inbuf[16384];
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
91 Uint8 outbuf[8192];
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
92 int outleft;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
93 int outpos;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
94 } mpglib_t;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
95
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
96
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
97
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
98 static int MPGLIB_init(void)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
99 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
100 return(1); /* always succeeds. */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
101 } /* MPGLIB_init */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
102
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
103
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
104 static void MPGLIB_quit(void)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
105 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
106 /* it's a no-op. */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
107 } /* MPGLIB_quit */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
108
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
109
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
110 static int MPGLIB_open(Sound_Sample *sample, const char *ext)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
111 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
112 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
113 mpglib_t *mpg = NULL;
293
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
114 int rc;
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
115
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
116 /*
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
117 * If I understand things correctly, MP3 files don't really have any
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
118 * magic header we can check for. The MP3 player is expected to just
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
119 * pick the first thing that looks like a valid frame and start
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
120 * playing from there.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
121 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
122 * So here's what we do: If the caller insists that this is really
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
123 * MP3 we'll take his word for it. Otherwise, use the same test as
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
124 * SDL_mixer does and check if the stream starts with something that
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
125 * looks like a frame.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
126 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
127 * A frame begins with 11 bits of frame sync (all bits must be set),
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
128 * followed by a two-bit MPEG Audio version ID:
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
129 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
130 * 00 - MPEG Version 2.5 (later extension of MPEG 2)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
131 * 01 - reserved
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
132 * 10 - MPEG Version 2 (ISO/IEC 13818-3)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
133 * 11 - MPEG Version 1 (ISO/IEC 11172-3)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
134 *
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
135 * Apparently we don't handle MPEG Version 2.5.
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
136 */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
137 if (__Sound_strcasecmp(ext, "MP3") != 0)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
138 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
139 Uint8 mp3_magic[2];
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
140
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
141 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1)
358
f11c10ffa31a Fixed some debug messages.
Ryan C. Gordon <icculus@icculus.org>
parents: 351
diff changeset
142 BAIL_MACRO("MPGLIB: Could not read MP3 magic.", 0);
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
143
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
144 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0)
358
f11c10ffa31a Fixed some debug messages.
Ryan C. Gordon <icculus@icculus.org>
parents: 351
diff changeset
145 BAIL_MACRO("MPGLIB: Not an MP3 stream.", 0);
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
146
351
069ce624d6cf FIXME cleanup.
Ryan C. Gordon <icculus@icculus.org>
parents: 322
diff changeset
147 /* If the seek fails, we'll probably miss a frame, but oh well. */
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
148 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
149 } /* if */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
150
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
151 mpg = (mpglib_t *) malloc(sizeof (mpglib_t));
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
152 BAIL_IF_MACRO(mpg == NULL, ERR_OUT_OF_MEMORY, 0);
293
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
153 memset(mpg, '\0', sizeof (mpglib_t));
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
154 InitMP3(&mpg->mp);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
155
293
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
156 rc = SDL_RWread(internal->rw, mpg->inbuf, 1, sizeof (mpg->inbuf));
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
157 if (rc <= 0)
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
158 {
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
159 free(mpg);
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
160 BAIL_MACRO("MPGLIB: Failed to read any data at all", 0);
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
161 } /* if */
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
162
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
163 if (decodeMP3(&mpg->mp, mpg->inbuf, rc,
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
164 mpg->outbuf, sizeof (mpg->outbuf),
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
165 &mpg->outleft) == MP3_ERR)
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
166 {
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
167 free(mpg);
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
168 BAIL_MACRO("MPGLIB: Not an MP3 stream?", 0);
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
169 } /* if */
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
170
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
171 SNDDBG(("MPGLIB: Accepting data stream.\n"));
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
172
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
173 internal->decoder_private = mpg;
293
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
174 sample->actual.rate = mpglib_freqs[mpg->mp.fr.sampling_frequency];
ee6e1f8bfae9 Can determine audio format correctly (mostly correctly?) now. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 271
diff changeset
175 sample->actual.channels = mpg->mp.fr.stereo;
351
069ce624d6cf FIXME cleanup.
Ryan C. Gordon <icculus@icculus.org>
parents: 322
diff changeset
176 sample->actual.format = AUDIO_S16SYS;
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
177 sample->flags = SOUND_SAMPLEFLAG_NONE;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
178
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
179 return(1); /* we'll handle this data. */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
180 } /* MPGLIB_open */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
181
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
182
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
183 static void MPGLIB_close(Sound_Sample *sample)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
184 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
185 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
186 mpglib_t *mpg = ((mpglib_t *) internal->decoder_private);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
187 ExitMP3(&mpg->mp);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188 free(mpg);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 } /* MPGLIB_close */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192 static Uint32 MPGLIB_read(Sound_Sample *sample)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195 mpglib_t *mpg = ((mpglib_t *) internal->decoder_private);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196 Uint32 bw = 0;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197 int rc;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
198
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199 while (bw < internal->buffer_size)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201 if (mpg->outleft > 0)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
203 Uint16 cpysize = internal->buffer_size - bw;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
204 if (cpysize > mpg->outleft)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
205 cpysize = mpg->outleft;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
206 memcpy(((Uint8 *) internal->buffer) + bw,
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
207 mpg->outbuf + mpg->outpos, cpysize);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
208 bw += cpysize;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209 mpg->outpos += cpysize;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
210 mpg->outleft -= cpysize;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
211 continue;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 } /* if */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 /* need to decode more from the MP3 stream... */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
215 mpg->outpos = 0;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
216 rc = decodeMP3(&mpg->mp, NULL, 0, mpg->outbuf,
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217 sizeof (mpg->outbuf), &mpg->outleft);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 if (rc == MP3_ERR)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
220 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 return(bw);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222 } /* if */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
223
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 else if (rc == MP3_NEED_MORE)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226 rc = SDL_RWread(internal->rw, mpg->inbuf, 1, sizeof (mpg->inbuf));
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 if (rc == -1)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
228 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
229 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230 return(bw);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 } /* if */
268
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
232
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 else if (rc == 0)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 sample->flags |= SOUND_SAMPLEFLAG_EOF;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 return(bw);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237 } /* else if */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238
268
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
239 /* make sure there isn't an ID3 tag. */
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
240 /*
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
241 * !!! FIXME: This can fail under the following circumstances:
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
242 * First, if there's the sequence "TAG" 128 bytes from the end
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
243 * of a read that isn't the EOF. This is unlikely.
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
244 * Second, if the TAG sequence is split between two reads (ie,
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
245 * the last byte of a read is 'T', and the next read is the
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
246 * final 127 bytes of the stream, being the rest of the ID3 tag).
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
247 * While this is more likely, it's still not very likely at all.
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
248 * Still, something SHOULD be done about this.
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
249 * ID3v2 tags are more complex, too, not to mention LYRICS tags,
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
250 * etc, which aren't handled, either. Hey, this IS meant to be
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
251 * a lightweight decoder. Use SMPEG if you need an all-purpose
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
252 * decoder. mpglib really assumes you control all your assets.
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
253 */
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
254 if (rc >= 128)
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
255 {
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
256 Uint8 *ptr = &mpg->inbuf[rc - 128];
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
257 if ((ptr[0] == 'T') && (ptr[1] == 'A') && (ptr[2] == 'G'))
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
258 rc -= 128; /* disregard it. */
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
259 } /* if */
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
260
263
cde06af563f7 Fix for EOF.
Ryan C. Gordon <icculus@icculus.org>
parents: 261
diff changeset
261 rc = decodeMP3(&mpg->mp, mpg->inbuf, rc,
268
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
262 mpg->outbuf, sizeof (mpg->outbuf),
9b89bb587f8f Detect and discard ID3 tags.
Ryan C. Gordon <icculus@icculus.org>
parents: 263
diff changeset
263 &mpg->outleft);
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264 if (rc == MP3_ERR)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267 return(bw);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 } /* if */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269 } /* else if */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270 } /* while */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 return(bw);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 } /* MPGLIB_read */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 static int MPGLIB_rewind(Sound_Sample *sample)
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 {
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 mpglib_t *mpg = ((mpglib_t *) internal->decoder_private);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
280 BAIL_IF_MACRO(SDL_RWseek(internal->rw, 0, SEEK_SET) != 0, ERR_IO_ERROR, 0);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
281
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282 /* this is just resetting some fields in a structure; it's very fast. */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 ExitMP3(&mpg->mp);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284 InitMP3(&mpg->mp);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285 mpg->outpos = mpg->outleft = 0;
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 return(1);
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287 } /* MPGLIB_rewind */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289
306
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
290 static int MPGLIB_seek(Sound_Sample *sample, Uint32 ms)
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
291 {
351
069ce624d6cf FIXME cleanup.
Ryan C. Gordon <icculus@icculus.org>
parents: 322
diff changeset
292 BAIL_MACRO("MPGLIB: Seeking not implemented", 0);
306
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
293 } /* MPGLIB_seek */
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 293
diff changeset
294
261
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295 #endif /* SOUND_SUPPORTS_MPGLIB */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
296
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
297
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
298 /* end of mpglib.c ... */
9b6e82f7c853 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
299