annotate decoders/aiff.c @ 41:0d5ff5679523

Cleanups from Torbj�rn Andersson.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 22 Sep 2001 12:28:58 +0000
parents 938ef560c7bf
children ea58bc3b15d7
rev   line source
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
1 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
2 * SDL_sound -- An abstract sound format decoding API.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
3 * Copyright (C) 2001 Ryan C. Gordon.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
4 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
5 * This library is free software; you can redistribute it and/or
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
6 * modify it under the terms of the GNU Lesser General Public
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
7 * License as published by the Free Software Foundation; either
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
8 * version 2.1 of the License, or (at your option) any later version.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
9 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
10 * This library is distributed in the hope that it will be useful,
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
13 * Lesser General Public License for more details.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
14 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
15 * You should have received a copy of the GNU Lesser General Public
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
16 * License along with this library; if not, write to the Free Software
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
18 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
19
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
20 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
21 * AIFF decoder for SDL_sound
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
22 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
23 * [Insert something profound about the AIFF file format here.]
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
24 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
25 * This code was ripped from a decoder I had written for SDL_mixer, which was
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
26 * based on SDL_mixer's old AIFF music loader. (This loader was unfortunately
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
27 * completely broken, but it was still useful because all the pieces were
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
28 * still there, so to speak.)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
29 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
30 * When rewriting it for SDL_sound, I changed its structure to be more like
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
31 * the WAV loader Ryan wrote. Had they not both been part of the same project
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
32 * it would have been embarrassing how similar they are.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
33 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
34 * It is not the most feature-complete AIFF loader the world has ever seen.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
35 * For instance, it only makes a token attempt at implementing the AIFF-C
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
36 * standard; basically the parts of it that I can easily understand and test.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
37 * It's a start, though.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
38 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
39 * Please see the file LICENSE in the source's root directory.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
40 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
41 * This file was written by Torbjörn Andersson. (d91tan@Update.UU.SE)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
42 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
43
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
44 #include <stdio.h>
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
45 #include <stdlib.h>
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
46 #include <string.h>
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
47 #include <assert.h>
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
48
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
49 #include "SDL.h"
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
50 #include "SDL_endian.h"
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
51 #include "SDL_sound.h"
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
52
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
53 #define __SDL_SOUND_INTERNAL__
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
54 #include "SDL_sound_internal.h"
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
55
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
56 #if (!defined SOUND_SUPPORTS_AIFF)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
57 #error SOUND_SUPPORTS_AIFF must be defined.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
58 #endif
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
59
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
60
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
61 static int AIFF_open(Sound_Sample *sample, const char *ext);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
62 static void AIFF_close(Sound_Sample *sample);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
63 static Uint32 AIFF_read(Sound_Sample *sample);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
64
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
65 const Sound_DecoderFunctions __Sound_DecoderFunctions_AIFF =
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
66 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
67 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
68 "AIFF",
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
69 "Audio Interchange File Format",
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
70 "Torbjörn Andersson <d91tan@Update.UU.SE>",
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
71 "http://www.icculus.org/SDL_sound/"
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
72 },
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
73
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
74 AIFF_open, /* open() method */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
75 AIFF_close, /* close() method */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
76 AIFF_read /* read() method */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
77 };
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
78
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
79
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
80 /* this is what we store in our internal->decoder_private field... */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
81 typedef struct {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
82 Sint32 bytesLeft;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
83 } aiff_t;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
84
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
85
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
86 /* Chunk management code... */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
87
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
88 #define formID 0x4d524f46 /* "FORM", in ascii. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
89 #define aiffID 0x46464941 /* "AIFF", in ascii. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
90 #define aifcID 0x43464941 /* "AIFC", in ascii. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
91 #define ssndID 0x444e5353 /* "SSND", in ascii. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
92 #define commID 0x4d4d4f43 /* "COMM", in ascii. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
93
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
94 #define noneID 0x454e4f4e /* "NONE", in ascii. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
95
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
96 typedef struct
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
97 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
98 Uint32 ckID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
99 Uint32 ckDataSize;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
100 Uint16 numChannels;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
101 Uint32 numSampleFrames;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
102 Uint16 sampleSize;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
103 Uint32 sampleRate;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
104 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
105 * We don't handle AIFF-C compressed audio yet, but for those
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
106 * interested the allowed compression types are supposed to be
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
107 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
108 * compressionType compressionName meaning
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
109 * ---------------------------------------------------------------
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
110 * 'NONE' "not compressed" uncompressed, that is,
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
111 * straight digitized samples
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
112 * 'ACE2' "ACE 2-to-1" 2-to-1 IIGS ACE (Audio
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
113 * Compression / Expansion)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
114 * 'ACE8' "ACE 8-to-3" 8-to-3 IIGS ACE (Audio
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
115 * Compression / Expansion)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
116 * 'MAC3' "MACE 3-to-1" 3-to-1 Macintosh Audio
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
117 * Compression / Expansion
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
118 * 'MAC6' "MACE 6-to-1" 6-to-1 Macintosh Audio
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
119 * Compression / Expansion
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
120 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
121 * A pstring is a "Pascal-style string", that is, "one byte followed
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
122 * by test bytes followed when needed by one pad byte. The total
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
123 * number of bytes in a pstring must be even. The pad byte is
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
124 * included when the number of text bytes is even, so the total of
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
125 * text bytes + one count byte + one pad byte will be even. This pad
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
126 * byte is not reflected in the count."
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
127 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
128 * As for how these compression algorithms work, your guess is as
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
129 * good as mine.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
130 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
131 Uint32 compressionType;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
132 #if 0
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
133 pstring compressionName;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
134 #endif
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
135 } comm_t;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
136
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
137
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
138 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
139 * Sample rate is encoded as an "80 bit IEEE Standard 754 floating point
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
140 * number (Standard Apple Numeric Environment [SANE] data type Extended)".
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
141 * Whose bright idea was that?
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
142 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
143 * This function was adapted from libsndfile, and while I do know a little
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
144 * bit about the IEEE floating point standard I don't pretend to fully
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
145 * understand this.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
146 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
147
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
148 static Uint32 SANE_to_Uint32 (Uint8 *sanebuf)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
149 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
150 /* Is the frequency outside of what we can represent with Uint32? */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
151 if ( (sanebuf[0] & 0x80)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
152 || (sanebuf[0] <= 0x3F)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
153 || (sanebuf[0] > 0x40)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
154 || (sanebuf[0] == 0x40 && sanebuf[1] > 0x1C) )
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
155 return 0;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
156
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
157 return ((sanebuf[2] << 23) | (sanebuf[3] << 15) | (sanebuf[4] << 7)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
158 | (sanebuf[5] >> 1)) >> (29 - sanebuf[1]);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
159 } /* SANE_to_Uint32 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
160
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
161
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
162 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
163 * Read in a comm_t from disk. This makes this process safe regardless of
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
164 * the processor's byte order or how the comm_t structure is packed.
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
165 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
166
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
167 static int read_comm_chunk(SDL_RWops *rw, comm_t *comm)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
168 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
169 Uint8 sampleRate[10];
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
170
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
171 /* skip reading the chunk ID, since it was already read at this point... */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
172 comm->ckID = commID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
173
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
174 if (SDL_RWread(rw, &comm->ckDataSize, sizeof (comm->ckDataSize), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
175 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
176 comm->ckDataSize = SDL_SwapBE32(comm->ckDataSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
177
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
178 if (SDL_RWread(rw, &comm->numChannels, sizeof (comm->numChannels), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
179 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
180 comm->numChannels = SDL_SwapBE16(comm->numChannels);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
181
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
182 if (SDL_RWread(rw, &comm->numSampleFrames,
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
183 sizeof (comm->numSampleFrames), 1) != 1)
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
184 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
185 comm->numSampleFrames = SDL_SwapBE32(comm->numSampleFrames);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
186
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
187 if (SDL_RWread(rw, &comm->sampleSize, sizeof (comm->sampleSize), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 comm->sampleSize = SDL_SwapBE16(comm->sampleSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
191 if (SDL_RWread(rw, sampleRate, sizeof (sampleRate), 1) != 1)
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193 comm->sampleRate = SANE_to_Uint32(sampleRate);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195 if (comm->ckDataSize > sizeof(comm->numChannels)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196 + sizeof(comm->numSampleFrames)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197 + sizeof(comm->sampleSize)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
198 + sizeof(sampleRate))
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199 {
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
200 if (SDL_RWread(rw, &comm->compressionType,
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
201 sizeof (comm->compressionType), 1) != 1)
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
203 comm->compressionType = SDL_SwapBE32(comm->compressionType);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
204 } /* if */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
205 else
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
206 comm->compressionType = noneID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
207
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
208 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209 } /* read_comm_chunk */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
210
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
211 typedef struct
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 Uint32 ckID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 Uint32 ckDataSize;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
215 Uint32 offset;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
216 Uint32 blockSize;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 * Then, comm->numSampleFrames sample frames. (It's better to get the
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 * length from numSampleFrames than from ckDataSize.)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
220 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 } ssnd_t;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
223
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 static int read_ssnd_chunk(SDL_RWops *rw, ssnd_t *ssnd)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226 /* skip reading the chunk ID, since it was already read at this point... */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 ssnd->ckID = ssndID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
228
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
229 if (SDL_RWread(rw, &ssnd->ckDataSize, sizeof (ssnd->ckDataSize), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 ssnd->ckDataSize = SDL_SwapBE32(ssnd->ckDataSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
233 if (SDL_RWread(rw, &ssnd->offset, sizeof (ssnd->offset), 1) != 1)
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 ssnd->offset = SDL_SwapBE32(ssnd->offset);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
237 if (SDL_RWread(rw, &ssnd->blockSize, sizeof (ssnd->blockSize), 1) != 1)
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239 ssnd->blockSize = SDL_SwapBE32(ssnd->blockSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241 /* Leave the SDL_RWops position indicator at the start of the samples */
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
242 /* !!! FIXME: Int? Really? */
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
243 if (SDL_RWseek(rw, (int) ssnd->offset, SEEK_CUR) == -1)
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247 } /* read_ssnd_chunk */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
248
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
249
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 static int find_chunk(SDL_RWops *rw, Uint32 id)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
251 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 Sint32 siz = 0;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 Uint32 _id = 0;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 while (1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257 BAIL_IF_MACRO(SDL_RWread(rw, &_id, sizeof (_id), 1) != 1, NULL, 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 if (SDL_SwapLE32(_id) == id)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261 BAIL_IF_MACRO(SDL_RWread(rw, &siz, sizeof (siz), 1) != 1, NULL, 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262 siz = SDL_SwapBE32(siz);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 assert(siz > 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264 BAIL_IF_MACRO(SDL_RWseek(rw, siz, SEEK_CUR) == -1, NULL, 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 } /* while */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267 return(0); /* shouldn't hit this, but just in case... */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 } /* find_chunk */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271 static int AIFF_open(Sound_Sample *sample, const char *ext)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 SDL_RWops *rw = internal->rw;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275 Uint32 chunk_id;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 int bytes_per_sample;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 long pos;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 comm_t c;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 ssnd_t s;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
280 aiff_t *a;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
281
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282 BAIL_IF_MACRO(SDL_ReadLE32(rw) != formID, "AIFF: Not a FORM file.", 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 SDL_ReadBE32(rw); /* throw the length away; we don't need it. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285 chunk_id = SDL_ReadLE32(rw);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 BAIL_IF_MACRO(chunk_id != aiffID && chunk_id != aifcID,
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287 "AIFF: Not an AIFF or AIFC file.", 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289 /* Chunks may appear in any order, so we establish base camp here. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 pos = SDL_RWtell(rw);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 BAIL_IF_MACRO(!find_chunk(rw, commID), "AIFF: No common chunk.", 0);
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
293 BAIL_IF_MACRO(!read_comm_chunk(rw, &c),
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
294 "AIFF: Can't read common chunk.", 0);
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
296 /* !!! FIXME: This will have to change for compression types... */
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
297 BAIL_IF_MACRO(c.compressionType != noneID,
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
298 "AIFF: Unsupported encoding.", 0);
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
299
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
300 BAIL_IF_MACRO(c.sampleRate == 0, "AIFF: Unsupported sample rate.", 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
301
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
302 sample->actual.channels = (Uint8) c.numChannels;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
303 sample->actual.rate = c.sampleRate;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
304
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
305 if (c.sampleSize <= 8)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
306 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
307 sample->actual.format = AUDIO_S8;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
308 bytes_per_sample = 1;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
309 } /* if */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
310 else if (c.sampleSize <= 16)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
311 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
312 sample->actual.format = AUDIO_S16MSB;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
313 bytes_per_sample = 2;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
314 } /* if */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
315 else
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
316 BAIL_MACRO("AIFF: Unsupported sample size.", 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
317
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
318 SDL_RWseek(rw, pos, SEEK_SET);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
319
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
320 BAIL_IF_MACRO(!find_chunk(rw, ssndID), "AIFF: No sound data chunk.", 0);
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
321 BAIL_IF_MACRO(!read_ssnd_chunk(rw, &s),
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
322 "AIFF: Can't read sound data chunk.", 0);
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
323
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
324 a = (aiff_t *) malloc(sizeof(aiff_t));
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
325 BAIL_IF_MACRO(a == NULL, ERR_OUT_OF_MEMORY, 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
326 a->bytesLeft = bytes_per_sample * c.numSampleFrames;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
327 internal->decoder_private = (void *) a;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
328
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
329 sample->flags = SOUND_SAMPLEFLAG_NONE;
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
330
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
331 _D(("AIFF: Accepting data stream.\n"));
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
332 return(1); /* we'll handle this data. */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
333 } /* AIFF_open */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
334
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
335
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
336 static void AIFF_close(Sound_Sample *sample)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
337 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
338 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
339 free(internal->decoder_private);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
340 } /* WAV_close */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
341
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
342
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
343 static Uint32 AIFF_read(Sound_Sample *sample)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
344 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
345 Uint32 retval;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
346 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
347 aiff_t *a = (aiff_t *) internal->decoder_private;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
348 Uint32 max = (internal->buffer_size < (Uint32) a->bytesLeft) ?
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
349 internal->buffer_size : (Uint32) a->bytesLeft;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
350
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
351 assert(max > 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
352
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
353 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
354 * We don't actually do any decoding, so we read the AIFF data
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
355 * directly into the internal buffer...
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
356 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
357 retval = SDL_RWread(internal->rw, internal->buffer, 1, max);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
358
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
359 a->bytesLeft -= retval;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
360
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
361 /* Make sure the read went smoothly... */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
362 if ((retval == 0) || (a->bytesLeft == 0))
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
363 sample->flags |= SOUND_SAMPLEFLAG_EOF;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
364
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
365 else if (retval == -1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
366 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
367
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
368 /* (next call this EAGAIN may turn into an EOF or error.) */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
369 else if (retval < internal->buffer_size)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
370 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
371
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
372 return(retval);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
373 } /* AIFF_read */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
374
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
375
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
376 /* end of aiff.c ... */