Mercurial > SDL_sound_CoreAudio

annotate decoders/aiff.c @ 147:9d122da5f5a9

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Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 23 Oct 2001 18:29:00 +0000
parents 1b36803660bc
children 1df5c106504e
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
106
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44 #if HAVE_CONFIG_H
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45 # include <config.h>
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46 #endif
100
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47
104
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48 #ifdef SOUND_SUPPORTS_AIFF
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49
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50 #include <stdio.h>
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51 #include <stdlib.h>
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52 #include <string.h>
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53 #include <assert.h>
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54
106
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55 #include "SDL_sound.h"
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56
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57 #define __SDL_SOUND_INTERNAL__
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58 #include "SDL_sound_internal.h"
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59
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60 static int AIFF_init(void);
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61 static void AIFF_quit(void);
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62 static int AIFF_open(Sound_Sample *sample, const char *ext);
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63 static void AIFF_close(Sound_Sample *sample);
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64 static Uint32 AIFF_read(Sound_Sample *sample);
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65
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66 const Sound_DecoderFunctions __Sound_DecoderFunctions_AIFF =
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67 {
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68 {
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69 "AIFF",
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70 "Audio Interchange File Format",
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71 "Torbjörn Andersson <d91tan@Update.UU.SE>",
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72 "http://www.icculus.org/SDL_sound/"
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73 },
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74
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75 AIFF_init, /* init() method */
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76 AIFF_quit, /* quit() method */
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77 AIFF_open, /* open() method */
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78 AIFF_close, /* close() method */
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79 AIFF_read /* read() method */
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80 };
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81
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82
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83 /* this is what we store in our internal->decoder_private field... */
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84 typedef struct {
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85 Sint32 bytesLeft;
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86 } aiff_t;
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87
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88
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89 /* Chunk management code... */
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90
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91 #define formID 0x4d524f46 /* "FORM", in ascii. */
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92 #define aiffID 0x46464941 /* "AIFF", in ascii. */
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93 #define aifcID 0x43464941 /* "AIFC", in ascii. */
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94 #define ssndID 0x444e5353 /* "SSND", in ascii. */
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95 #define commID 0x4d4d4f43 /* "COMM", in ascii. */
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96
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97 #define noneID 0x454e4f4e /* "NONE", in ascii. */
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98
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99 typedef struct
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100 {
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101 Uint32 ckID;
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102 Uint32 ckDataSize;
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103 Uint16 numChannels;
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104 Uint32 numSampleFrames;
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105 Uint16 sampleSize;
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106 Uint32 sampleRate;
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107 /*
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108 * We don't handle AIFF-C compressed audio yet, but for those
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109 * interested the allowed compression types are supposed to be
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110 *
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111 * compressionType compressionName meaning
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112 * ---------------------------------------------------------------
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113 * 'NONE' "not compressed" uncompressed, that is,
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114 * straight digitized samples
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115 * 'ACE2' "ACE 2-to-1" 2-to-1 IIGS ACE (Audio
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116 * Compression / Expansion)
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117 * 'ACE8' "ACE 8-to-3" 8-to-3 IIGS ACE (Audio
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118 * Compression / Expansion)
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119 * 'MAC3' "MACE 3-to-1" 3-to-1 Macintosh Audio
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120 * Compression / Expansion
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121 * 'MAC6' "MACE 6-to-1" 6-to-1 Macintosh Audio
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122 * Compression / Expansion
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123 *
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124 * A pstring is a "Pascal-style string", that is, "one byte followed
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125 * by test bytes followed when needed by one pad byte. The total
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126 * number of bytes in a pstring must be even. The pad byte is
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127 * included when the number of text bytes is even, so the total of
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128 * text bytes + one count byte + one pad byte will be even. This pad
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129 * byte is not reflected in the count."
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130 *
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131 * As for how these compression algorithms work, your guess is as
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132 * good as mine.
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133 */
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134 Uint32 compressionType;
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135 #if 0
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136 pstring compressionName;
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137 #endif
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138 } comm_t;
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139
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140
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141
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142 static int AIFF_init(void)
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143 {
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144 return(1); /* always succeeds. */
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145 } /* AIFF_init */
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146
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147
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148 static void AIFF_quit(void)
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parents: 41
diff changeset
149 {
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parents: 41
diff changeset
150 /* it's a no-op. */
ea58bc3b15d7 Added init() and quit() methods.
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parents: 41
diff changeset
151 } /* AIFF_quit */
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diff changeset
152
ea58bc3b15d7 Added init() and quit() methods.
Ryan C. Gordon <icculus@icculus.org>
parents: 41
diff changeset
153
62
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Ryan C. Gordon <icculus@icculus.org>
parents: 47
diff changeset
154 /*
34
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Ryan C. Gordon <icculus@icculus.org>
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155 * Sample rate is encoded as an "80 bit IEEE Standard 754 floating point
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
156 * number (Standard Apple Numeric Environment [SANE] data type Extended)".
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
157 * Whose bright idea was that?
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Ryan C. Gordon <icculus@icculus.org>
parents:
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158 *
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Ryan C. Gordon <icculus@icculus.org>
parents:
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159 * 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
160 * bit about the IEEE floating point standard I don't pretend to fully
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
161 * understand this.
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Ryan C. Gordon <icculus@icculus.org>
parents:
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162 */
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Ryan C. Gordon <icculus@icculus.org>
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163
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Ryan C. Gordon <icculus@icculus.org>
parents:
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164 static Uint32 SANE_to_Uint32 (Uint8 *sanebuf)
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165 {
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
166 /* Is the frequency outside of what we can represent with Uint32? */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
167 if ( (sanebuf[0] & 0x80)
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Ryan C. Gordon <icculus@icculus.org>
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168 || (sanebuf[0] <= 0x3F)
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Ryan C. Gordon <icculus@icculus.org>
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169 || (sanebuf[0] > 0x40)
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Ryan C. Gordon <icculus@icculus.org>
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170 || (sanebuf[0] == 0x40 && sanebuf[1] > 0x1C) )
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parents:
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171 return 0;
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172
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Ryan C. Gordon <icculus@icculus.org>
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173 return ((sanebuf[2] << 23) | (sanebuf[3] << 15) | (sanebuf[4] << 7)
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Ryan C. Gordon <icculus@icculus.org>
parents:
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174 | (sanebuf[5] >> 1)) >> (29 - sanebuf[1]);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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175 } /* SANE_to_Uint32 */
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Ryan C. Gordon <icculus@icculus.org>
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176
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
177
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Ryan C. Gordon <icculus@icculus.org>
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178 /*
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Ryan C. Gordon <icculus@icculus.org>
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179 * Read in a comm_t from disk. This makes this process safe regardless of
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Ryan C. Gordon <icculus@icculus.org>
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180 * the processor's byte order or how the comm_t structure is packed.
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Ryan C. Gordon <icculus@icculus.org>
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181 */
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182
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Ryan C. Gordon <icculus@icculus.org>
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183 static int read_comm_chunk(SDL_RWops *rw, comm_t *comm)
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184 {
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Ryan C. Gordon <icculus@icculus.org>
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185 Uint8 sampleRate[10];
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Ryan C. Gordon <icculus@icculus.org>
parents:
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186
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Ryan C. Gordon <icculus@icculus.org>
parents:
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187 /* skip reading the chunk ID, since it was already read at this point... */
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parents:
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188 comm->ckID = commID;
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189
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Ryan C. Gordon <icculus@icculus.org>
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190 if (SDL_RWread(rw, &comm->ckDataSize, sizeof (comm->ckDataSize), 1) != 1)
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Ryan C. Gordon <icculus@icculus.org>
parents:
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191 return(0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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192 comm->ckDataSize = SDL_SwapBE32(comm->ckDataSize);
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193
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Ryan C. Gordon <icculus@icculus.org>
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194 if (SDL_RWread(rw, &comm->numChannels, sizeof (comm->numChannels), 1) != 1)
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parents:
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195 return(0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196 comm->numChannels = SDL_SwapBE16(comm->numChannels);
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197
41
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diff changeset
198 if (SDL_RWread(rw, &comm->numSampleFrames,
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Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
199 sizeof (comm->numSampleFrames), 1) != 1)
34
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200 return(0);
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201 comm->numSampleFrames = SDL_SwapBE32(comm->numSampleFrames);
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202
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Ryan C. Gordon <icculus@icculus.org>
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203 if (SDL_RWread(rw, &comm->sampleSize, sizeof (comm->sampleSize), 1) != 1)
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204 return(0);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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205 comm->sampleSize = SDL_SwapBE16(comm->sampleSize);
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Ryan C. Gordon <icculus@icculus.org>
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206
41
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diff changeset
207 if (SDL_RWread(rw, sampleRate, sizeof (sampleRate), 1) != 1)
34
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Ryan C. Gordon <icculus@icculus.org>
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208 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
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209 comm->sampleRate = SANE_to_Uint32(sampleRate);
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Ryan C. Gordon <icculus@icculus.org>
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210
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Ryan C. Gordon <icculus@icculus.org>
parents:
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211 if (comm->ckDataSize > sizeof(comm->numChannels)
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Ryan C. Gordon <icculus@icculus.org>
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212 + sizeof(comm->numSampleFrames)
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Ryan C. Gordon <icculus@icculus.org>
parents:
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213 + sizeof(comm->sampleSize)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 + sizeof(sampleRate))
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Ryan C. Gordon <icculus@icculus.org>
parents:
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215 {
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
216 if (SDL_RWread(rw, &comm->compressionType,
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
217 sizeof (comm->compressionType), 1) != 1)
34
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
218 return(0);
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
219 comm->compressionType = SDL_SwapBE32(comm->compressionType);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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220 } /* if */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 else
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Ryan C. Gordon <icculus@icculus.org>
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222 comm->compressionType = noneID;
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Ryan C. Gordon <icculus@icculus.org>
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223
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Ryan C. Gordon <icculus@icculus.org>
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224 return(1);
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Ryan C. Gordon <icculus@icculus.org>
parents:
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225 } /* read_comm_chunk */
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Ryan C. Gordon <icculus@icculus.org>
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226
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Ryan C. Gordon <icculus@icculus.org>
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227 typedef struct
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Ryan C. Gordon <icculus@icculus.org>
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228 {
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Ryan C. Gordon <icculus@icculus.org>
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229 Uint32 ckID;
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Ryan C. Gordon <icculus@icculus.org>
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230 Uint32 ckDataSize;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 Uint32 offset;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 Uint32 blockSize;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 /*
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234 * 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
235 * length from numSampleFrames than from ckDataSize.)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237 } ssnd_t;
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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
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240 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
241 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242 /* 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
243 ssnd->ckID = ssndID;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245 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
246 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247 ssnd->ckDataSize = SDL_SwapBE32(ssnd->ckDataSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
248
41
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Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
249 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
250 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
251 ssnd->offset = SDL_SwapBE32(ssnd->offset);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252
41
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
253 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
254 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 ssnd->blockSize = SDL_SwapBE32(ssnd->blockSize);
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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 /* 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
258 /* !!! FIXME: Int? Really? */
0d5ff5679523 Cleanups from Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 34
diff changeset
259 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
260 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 } /* read_ssnd_chunk */
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
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266 static int find_chunk(SDL_RWops *rw, Uint32 id)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 Sint32 siz = 0;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269 Uint32 _id = 0;
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 while (1)
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 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
274 if (SDL_SwapLE32(_id) == id)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 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
278 siz = SDL_SwapBE32(siz);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 assert(siz > 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
280 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
281 } /* while */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 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
284 } /* find_chunk */
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
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287 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
288 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 SDL_RWops *rw = internal->rw;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291 Uint32 chunk_id;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 int bytes_per_sample;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 long pos;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
294 comm_t c;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295 ssnd_t s;
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296 aiff_t *a;
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297
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298 BAIL_IF_MACRO(SDL_ReadLE32(rw) != formID, "AIFF: Not a FORM file.", 0);
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299 SDL_ReadBE32(rw); /* throw the length away; we don't need it. */
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300
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301 chunk_id = SDL_ReadLE32(rw);
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302 BAIL_IF_MACRO(chunk_id != aiffID && chunk_id != aifcID,
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303 "AIFF: Not an AIFF or AIFC file.", 0);
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304
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305 /* Chunks may appear in any order, so we establish base camp here. */
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306 pos = SDL_RWtell(rw);
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307
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308 BAIL_IF_MACRO(!find_chunk(rw, commID), "AIFF: No common chunk.", 0);
41
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309 BAIL_IF_MACRO(!read_comm_chunk(rw, &c),
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310 "AIFF: Can't read common chunk.", 0);
34
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311
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312 /* !!! FIXME: This will have to change for compression types... */
41
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313 BAIL_IF_MACRO(c.compressionType != noneID,
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314 "AIFF: Unsupported encoding.", 0);
34
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315
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316 BAIL_IF_MACRO(c.sampleRate == 0, "AIFF: Unsupported sample rate.", 0);
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317
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318 sample->actual.channels = (Uint8) c.numChannels;
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319 sample->actual.rate = c.sampleRate;
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320
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321 if (c.sampleSize <= 8)
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322 {
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323 sample->actual.format = AUDIO_S8;
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324 bytes_per_sample = 1;
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325 } /* if */
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326 else if (c.sampleSize <= 16)
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327 {
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328 sample->actual.format = AUDIO_S16MSB;
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329 bytes_per_sample = 2;
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Ryan C. Gordon <icculus@icculus.org>
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330 } /* if */
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331 else
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332 BAIL_MACRO("AIFF: Unsupported sample size.", 0);
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333
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334 SDL_RWseek(rw, pos, SEEK_SET);
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335
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336 BAIL_IF_MACRO(!find_chunk(rw, ssndID), "AIFF: No sound data chunk.", 0);
41
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diff changeset
337 BAIL_IF_MACRO(!read_ssnd_chunk(rw, &s),
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338 "AIFF: Can't read sound data chunk.", 0);
34
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339
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340 a = (aiff_t *) malloc(sizeof(aiff_t));
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341 BAIL_IF_MACRO(a == NULL, ERR_OUT_OF_MEMORY, 0);
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342 a->bytesLeft = bytes_per_sample * c.numSampleFrames;
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Ryan C. Gordon <icculus@icculus.org>
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343 internal->decoder_private = (void *) a;
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344
41
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diff changeset
345 sample->flags = SOUND_SAMPLEFLAG_NONE;
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diff changeset
346
62
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Ryan C. Gordon <icculus@icculus.org>
parents: 47
diff changeset
347 SNDDBG(("AIFF: Accepting data stream.\n"));
34
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348 return(1); /* we'll handle this data. */
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
349 } /* AIFF_open */
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350
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351
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Ryan C. Gordon <icculus@icculus.org>
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352 static void AIFF_close(Sound_Sample *sample)
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Ryan C. Gordon <icculus@icculus.org>
parents:
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353 {
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Ryan C. Gordon <icculus@icculus.org>
parents:
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354 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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Ryan C. Gordon <icculus@icculus.org>
parents:
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355 free(internal->decoder_private);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
356 } /* WAV_close */
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357
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Ryan C. Gordon <icculus@icculus.org>
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358
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
359 static Uint32 AIFF_read(Sound_Sample *sample)
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parents:
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360 {
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parents:
diff changeset
361 Uint32 retval;
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362 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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363 aiff_t *a = (aiff_t *) internal->decoder_private;
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parents:
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364 Uint32 max = (internal->buffer_size < (Uint32) a->bytesLeft) ?
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parents:
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365 internal->buffer_size : (Uint32) a->bytesLeft;
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diff changeset
366
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
367 assert(max > 0);
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368
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Ryan C. Gordon <icculus@icculus.org>
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369 /*
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
370 * We don't actually do any decoding, so we read the AIFF data
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Ryan C. Gordon <icculus@icculus.org>
parents:
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371 * directly into the internal buffer...
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Ryan C. Gordon <icculus@icculus.org>
parents:
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372 */
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parents:
diff changeset
373 retval = SDL_RWread(internal->rw, internal->buffer, 1, max);
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374
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Ryan C. Gordon <icculus@icculus.org>
parents:
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375 a->bytesLeft -= retval;
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diff changeset
376
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
377 /* Make sure the read went smoothly... */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
378 if ((retval == 0) || (a->bytesLeft == 0))
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
379 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
380
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
381 else if (retval == -1)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
382 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
383
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
384 /* (next call this EAGAIN may turn into an EOF or error.) */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
385 else if (retval < internal->buffer_size)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
386 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
387
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
388 return(retval);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
389 } /* AIFF_read */
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diff changeset
390
64
40006625142a Changes in preparation of autoconf support.
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diff changeset
391 #endif /* SOUND_SUPPORTS_AIFF */
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diff changeset
392
34
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diff changeset
393
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
394 /* end of aiff.c ... */