Mercurial > SDL_sound_CoreAudio

annotate decoders/aiff.c @ 104:103cfcb3c014

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Updated to fix build system problem.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 03 Oct 2001 18:15:52 +0000
parents 6d9fdec2f708
children 40de367eb59e
rev   line source
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1 /*
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2 * SDL_sound -- An abstract sound format decoding API.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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19
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20 /*
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21 * AIFF decoder for SDL_sound
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22 *
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23 * [Insert something profound about the AIFF file format here.]
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24 *
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25 * This code was ripped from a decoder I had written for SDL_mixer, which was
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26 * based on SDL_mixer's old AIFF music loader. (This loader was unfortunately
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27 * completely broken, but it was still useful because all the pieces were
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28 * still there, so to speak.)
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29 *
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30 * When rewriting it for SDL_sound, I changed its structure to be more like
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31 * the WAV loader Ryan wrote. Had they not both been part of the same project
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32 * it would have been embarrassing how similar they are.
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33 *
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34 * It is not the most feature-complete AIFF loader the world has ever seen.
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35 * For instance, it only makes a token attempt at implementing the AIFF-C
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36 * standard; basically the parts of it that I can easily understand and test.
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37 * It's a start, though.
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38 *
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39 * Please see the file LICENSE in the source's root directory.
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40 *
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41 * This file was written by Torbjörn Andersson. (d91tan@Update.UU.SE)
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42 */
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43
104
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44 #include "SDL_sound.h"
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45
100
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46 #define __SDL_SOUND_INTERNAL__
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47 #include "SDL_sound_internal.h"
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48
104
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49 #ifdef SOUND_SUPPORTS_AIFF
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50
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51 #include <stdio.h>
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52 #include <stdlib.h>
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53 #include <string.h>
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54 #include <assert.h>
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55
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56 #include "SDL.h"
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57 #include "SDL_endian.h"
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58
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59 static int AIFF_init(void);
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60 static void AIFF_quit(void);
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61 static int AIFF_open(Sound_Sample *sample, const char *ext);
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62 static void AIFF_close(Sound_Sample *sample);
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63 static Uint32 AIFF_read(Sound_Sample *sample);
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64
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65 const Sound_DecoderFunctions __Sound_DecoderFunctions_AIFF =
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66 {
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67 {
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68 "AIFF",
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69 "Audio Interchange File Format",
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70 "Torbjörn Andersson <d91tan@Update.UU.SE>",
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71 "http://www.icculus.org/SDL_sound/"
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72 },
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73
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74 AIFF_init, /* init() method */
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75 AIFF_quit, /* quit() method */
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76 AIFF_open, /* open() method */
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77 AIFF_close, /* close() method */
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78 AIFF_read /* read() method */
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79 };
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80
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81
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82 /* this is what we store in our internal->decoder_private field... */
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83 typedef struct {
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84 Sint32 bytesLeft;
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85 } aiff_t;
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86
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87
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88 /* Chunk management code... */
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89
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90 #define formID 0x4d524f46 /* "FORM", in ascii. */
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91 #define aiffID 0x46464941 /* "AIFF", in ascii. */
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92 #define aifcID 0x43464941 /* "AIFC", in ascii. */
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93 #define ssndID 0x444e5353 /* "SSND", in ascii. */
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94 #define commID 0x4d4d4f43 /* "COMM", in ascii. */
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95
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96 #define noneID 0x454e4f4e /* "NONE", in ascii. */
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97
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98 typedef struct
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99 {
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100 Uint32 ckID;
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101 Uint32 ckDataSize;
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102 Uint16 numChannels;
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103 Uint32 numSampleFrames;
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104 Uint16 sampleSize;
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105 Uint32 sampleRate;
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106 /*
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107 * We don't handle AIFF-C compressed audio yet, but for those
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108 * interested the allowed compression types are supposed to be
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109 *
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110 * compressionType compressionName meaning
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111 * ---------------------------------------------------------------
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112 * 'NONE' "not compressed" uncompressed, that is,
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113 * straight digitized samples
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114 * 'ACE2' "ACE 2-to-1" 2-to-1 IIGS ACE (Audio
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115 * Compression / Expansion)
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116 * 'ACE8' "ACE 8-to-3" 8-to-3 IIGS ACE (Audio
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117 * Compression / Expansion)
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118 * 'MAC3' "MACE 3-to-1" 3-to-1 Macintosh Audio
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119 * Compression / Expansion
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120 * 'MAC6' "MACE 6-to-1" 6-to-1 Macintosh Audio
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121 * Compression / Expansion
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122 *
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123 * A pstring is a "Pascal-style string", that is, "one byte followed
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124 * by test bytes followed when needed by one pad byte. The total
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125 * number of bytes in a pstring must be even. The pad byte is
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126 * included when the number of text bytes is even, so the total of
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127 * text bytes + one count byte + one pad byte will be even. This pad
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128 * byte is not reflected in the count."
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129 *
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130 * As for how these compression algorithms work, your guess is as
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131 * good as mine.
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132 */
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133 Uint32 compressionType;
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134 #if 0
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135 pstring compressionName;
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136 #endif
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137 } comm_t;
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138
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139
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140
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141 static int AIFF_init(void)
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142 {
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143 return(1); /* always succeeds. */
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144 } /* AIFF_init */
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145
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146
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147 static void AIFF_quit(void)
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148 {
ea58bc3b15d7 Added init() and quit() methods.
Ryan C. Gordon <icculus@icculus.org>
parents: 41
diff changeset
149 /* it's a no-op. */
ea58bc3b15d7 Added init() and quit() methods.
Ryan C. Gordon <icculus@icculus.org>
parents: 41
diff changeset
150 } /* AIFF_quit */
ea58bc3b15d7 Added init() and quit() methods.
Ryan C. Gordon <icculus@icculus.org>
parents: 41
diff changeset
151
ea58bc3b15d7 Added init() and quit() methods.
Ryan C. Gordon <icculus@icculus.org>
parents: 41
diff changeset
152
62
b13fafb976be Changed _D macro to DBGSND.
Ryan C. Gordon <icculus@icculus.org>
parents: 47
diff changeset
153 /*
34
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
154 * 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
155 * number (Standard Apple Numeric Environment [SANE] data type Extended)".
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
156 * Whose bright idea was that?
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
157 *
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
158 * 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
159 * 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
160 * understand this.
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
161 */
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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 static Uint32 SANE_to_Uint32 (Uint8 *sanebuf)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
164 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
165 /* 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
166 if ( (sanebuf[0] & 0x80)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
167 || (sanebuf[0] <= 0x3F)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
168 || (sanebuf[0] > 0x40)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
169 || (sanebuf[0] == 0x40 && sanebuf[1] > 0x1C) )
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
170 return 0;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
171
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
172 return ((sanebuf[2] << 23) | (sanebuf[3] << 15) | (sanebuf[4] << 7)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
173 | (sanebuf[5] >> 1)) >> (29 - sanebuf[1]);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
174 } /* SANE_to_Uint32 */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
175
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
176
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 * 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
179 * 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
180 */
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Ryan C. Gordon <icculus@icculus.org>
parents:
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181
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
182 static int read_comm_chunk(SDL_RWops *rw, comm_t *comm)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
183 {
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
184 Uint8 sampleRate[10];
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
185
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
186 /* 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
187 comm->ckID = commID;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 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
190 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191 comm->ckDataSize = SDL_SwapBE32(comm->ckDataSize);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193 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
194 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195 comm->numChannels = SDL_SwapBE16(comm->numChannels);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
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196
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
197 if (SDL_RWread(rw, &comm->numSampleFrames,
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
198 sizeof (comm->numSampleFrames), 1) != 1)
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 comm->numSampleFrames = SDL_SwapBE32(comm->numSampleFrames);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 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
203 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
204 comm->sampleSize = SDL_SwapBE16(comm->sampleSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
205
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
206 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
207 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
208 comm->sampleRate = SANE_to_Uint32(sampleRate);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
210 if (comm->ckDataSize > sizeof(comm->numChannels)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
211 + sizeof(comm->numSampleFrames)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 + sizeof(comm->sampleSize)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 + sizeof(sampleRate))
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 {
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
215 if (SDL_RWread(rw, &comm->compressionType,
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
216 sizeof (comm->compressionType), 1) != 1)
34
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 comm->compressionType = SDL_SwapBE32(comm->compressionType);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 } /* if */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
220 else
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 comm->compressionType = noneID;
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 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 } /* read_comm_chunk */
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 typedef struct
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
228 Uint32 ckID;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
229 Uint32 ckDataSize;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230 Uint32 offset;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 Uint32 blockSize;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 * 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
234 * length from numSampleFrames than from ckDataSize.)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 } ssnd_t;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239 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
240 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241 /* 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
242 ssnd->ckID = ssndID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 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
245 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246 ssnd->ckDataSize = SDL_SwapBE32(ssnd->ckDataSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
248 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
249 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 ssnd->offset = SDL_SwapBE32(ssnd->offset);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
251
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
252 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
253 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 ssnd->blockSize = SDL_SwapBE32(ssnd->blockSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 /* 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
257 /* !!! FIXME: Int? Really? */
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
258 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
259 return(0);
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 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262 } /* read_ssnd_chunk */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 static int find_chunk(SDL_RWops *rw, Uint32 id)
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 Sint32 siz = 0;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 Uint32 _id = 0;
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 while (1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 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
273 if (SDL_SwapLE32(_id) == id)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 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
277 siz = SDL_SwapBE32(siz);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 assert(siz > 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 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
280 } /* while */
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 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
283 } /* find_chunk */
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
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 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
287 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289 SDL_RWops *rw = internal->rw;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 Uint32 chunk_id;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291 int bytes_per_sample;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 long pos;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 comm_t c;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
294 ssnd_t s;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295 aiff_t *a;
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296
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297 BAIL_IF_MACRO(SDL_ReadLE32(rw) != formID, "AIFF: Not a FORM file.", 0);
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298 SDL_ReadBE32(rw); /* throw the length away; we don't need it. */
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299
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300 chunk_id = SDL_ReadLE32(rw);
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301 BAIL_IF_MACRO(chunk_id != aiffID && chunk_id != aifcID,
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302 "AIFF: Not an AIFF or AIFC file.", 0);
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303
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304 /* Chunks may appear in any order, so we establish base camp here. */
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305 pos = SDL_RWtell(rw);
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306
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307 BAIL_IF_MACRO(!find_chunk(rw, commID), "AIFF: No common chunk.", 0);
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308 BAIL_IF_MACRO(!read_comm_chunk(rw, &c),
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309 "AIFF: Can't read common chunk.", 0);
34
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310
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311 /* !!! FIXME: This will have to change for compression types... */
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312 BAIL_IF_MACRO(c.compressionType != noneID,
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313 "AIFF: Unsupported encoding.", 0);
34
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314
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315 BAIL_IF_MACRO(c.sampleRate == 0, "AIFF: Unsupported sample rate.", 0);
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316
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317 sample->actual.channels = (Uint8) c.numChannels;
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318 sample->actual.rate = c.sampleRate;
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319
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320 if (c.sampleSize <= 8)
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321 {
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322 sample->actual.format = AUDIO_S8;
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323 bytes_per_sample = 1;
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324 } /* if */
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325 else if (c.sampleSize <= 16)
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326 {
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327 sample->actual.format = AUDIO_S16MSB;
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328 bytes_per_sample = 2;
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329 } /* if */
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330 else
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331 BAIL_MACRO("AIFF: Unsupported sample size.", 0);
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332
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333 SDL_RWseek(rw, pos, SEEK_SET);
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334
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335 BAIL_IF_MACRO(!find_chunk(rw, ssndID), "AIFF: No sound data chunk.", 0);
41
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336 BAIL_IF_MACRO(!read_ssnd_chunk(rw, &s),
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337 "AIFF: Can't read sound data chunk.", 0);
34
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338
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339 a = (aiff_t *) malloc(sizeof(aiff_t));
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340 BAIL_IF_MACRO(a == NULL, ERR_OUT_OF_MEMORY, 0);
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341 a->bytesLeft = bytes_per_sample * c.numSampleFrames;
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342 internal->decoder_private = (void *) a;
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343
41
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344 sample->flags = SOUND_SAMPLEFLAG_NONE;
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345
62
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346 SNDDBG(("AIFF: Accepting data stream.\n"));
34
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347 return(1); /* we'll handle this data. */
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348 } /* AIFF_open */
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349
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350
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351 static void AIFF_close(Sound_Sample *sample)
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352 {
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353 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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354 free(internal->decoder_private);
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355 } /* WAV_close */
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356
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357
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358 static Uint32 AIFF_read(Sound_Sample *sample)
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359 {
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360 Uint32 retval;
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361 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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362 aiff_t *a = (aiff_t *) internal->decoder_private;
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363 Uint32 max = (internal->buffer_size < (Uint32) a->bytesLeft) ?
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364 internal->buffer_size : (Uint32) a->bytesLeft;
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365
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366 assert(max > 0);
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367
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Ryan C. Gordon <icculus@icculus.org>
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368 /*
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369 * We don't actually do any decoding, so we read the AIFF data
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370 * directly into the internal buffer...
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371 */
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372 retval = SDL_RWread(internal->rw, internal->buffer, 1, max);
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373
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374 a->bytesLeft -= retval;
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375
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Ryan C. Gordon <icculus@icculus.org>
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376 /* Make sure the read went smoothly... */
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377 if ((retval == 0) || (a->bytesLeft == 0))
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378 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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379
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380 else if (retval == -1)
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381 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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382
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Ryan C. Gordon <icculus@icculus.org>
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383 /* (next call this EAGAIN may turn into an EOF or error.) */
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diff changeset
384 else if (retval < internal->buffer_size)
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385 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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386
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387 return(retval);
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388 } /* AIFF_read */
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389
64
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390 #endif /* SOUND_SUPPORTS_AIFF */
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391
34
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392
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393 /* end of aiff.c ... */