Mercurial > SDL_sound_CoreAudio

annotate decoders/aiff.c @ 40:c15396fc0e55

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Fixed incorrect comment, by Torbj�rn Andersson. :)
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 20 Sep 2001 07:57:52 +0000
parents 938ef560c7bf
children 0d5ff5679523
rev   line source
34
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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
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44 #include <stdio.h>
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45 #include <stdlib.h>
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46 #include <string.h>
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47 #include <assert.h>
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48
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49 #include "SDL.h"
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50 #include "SDL_endian.h"
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51 #include "SDL_sound.h"
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52
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53 #define __SDL_SOUND_INTERNAL__
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54 #include "SDL_sound_internal.h"
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55
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56 #if (!defined SOUND_SUPPORTS_AIFF)
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57 #error SOUND_SUPPORTS_AIFF must be defined.
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58 #endif
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59
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60
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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_open, /* open() method */
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75 AIFF_close, /* close() method */
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76 AIFF_read /* read() method */
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77 };
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78
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79
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80 /* this is what we store in our internal->decoder_private field... */
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81 typedef struct {
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82 Sint32 bytesLeft;
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83 } aiff_t;
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84
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85
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86 /* Chunk management code... */
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87
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88 #define formID 0x4d524f46 /* "FORM", in ascii. */
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89 #define aiffID 0x46464941 /* "AIFF", in ascii. */
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90 #define aifcID 0x43464941 /* "AIFC", in ascii. */
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91 #define ssndID 0x444e5353 /* "SSND", in ascii. */
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92 #define commID 0x4d4d4f43 /* "COMM", in ascii. */
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93
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94 #define noneID 0x454e4f4e /* "NONE", in ascii. */
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95
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96 typedef struct
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97 {
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98 Uint32 ckID;
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99 Uint32 ckDataSize;
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100 Uint16 numChannels;
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101 Uint32 numSampleFrames;
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102 Uint16 sampleSize;
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103 Uint32 sampleRate;
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104 /*
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105 * We don't handle AIFF-C compressed audio yet, but for those
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106 * interested the allowed compression types are supposed to be
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107 *
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108 * compressionType compressionName meaning
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109 * ---------------------------------------------------------------
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110 * 'NONE' "not compressed" uncompressed, that is,
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111 * straight digitized samples
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112 * 'ACE2' "ACE 2-to-1" 2-to-1 IIGS ACE (Audio
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113 * Compression / Expansion)
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114 * 'ACE8' "ACE 8-to-3" 8-to-3 IIGS ACE (Audio
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115 * Compression / Expansion)
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116 * 'MAC3' "MACE 3-to-1" 3-to-1 Macintosh Audio
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117 * Compression / Expansion
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118 * 'MAC6' "MACE 6-to-1" 6-to-1 Macintosh Audio
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119 * Compression / Expansion
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120 *
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121 * A pstring is a "Pascal-style string", that is, "one byte followed
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122 * by test bytes followed when needed by one pad byte. The total
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123 * number of bytes in a pstring must be even. The pad byte is
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124 * included when the number of text bytes is even, so the total of
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125 * text bytes + one count byte + one pad byte will be even. This pad
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126 * byte is not reflected in the count."
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127 *
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128 * As for how these compression algorithms work, your guess is as
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129 * good as mine.
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130 */
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131 Uint32 compressionType;
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132 #if 0
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133 pstring compressionName;
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134 #endif
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135 } comm_t;
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136
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137
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138 /*
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139 * Sample rate is encoded as an "80 bit IEEE Standard 754 floating point
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140 * number (Standard Apple Numeric Environment [SANE] data type Extended)".
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141 * Whose bright idea was that?
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142 *
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143 * This function was adapted from libsndfile, and while I do know a little
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144 * bit about the IEEE floating point standard I don't pretend to fully
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145 * understand this.
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146 */
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147
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Ryan C. Gordon <icculus@icculus.org>
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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
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
182 if (SDL_RWread(rw, &comm->numSampleFrames, sizeof (comm->numSampleFrames), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
183 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
184 comm->numSampleFrames = SDL_SwapBE32(comm->numSampleFrames);
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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 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
187 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188 comm->sampleSize = SDL_SwapBE16(comm->sampleSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190 if (SDL_RWread(rw, sampleRate, sizeof(sampleRate), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192 comm->sampleRate = SANE_to_Uint32(sampleRate);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194 if (comm->ckDataSize > sizeof(comm->numChannels)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195 + sizeof(comm->numSampleFrames)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196 + sizeof(comm->sampleSize)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197 + sizeof(sampleRate))
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
198 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199 if (SDL_RWread(rw, &comm->compressionType, sizeof (comm->compressionType), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201 comm->compressionType = SDL_SwapBE32(comm->compressionType);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 } /* if */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
203 else
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
204 comm->compressionType = noneID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
205
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
206 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
207 } /* read_comm_chunk */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
208
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209 typedef struct
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 Uint32 ckID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 Uint32 ckDataSize;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 Uint32 offset;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 Uint32 blockSize;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
215 /*
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
216 * 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
217 * length from numSampleFrames than from ckDataSize.)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 } ssnd_t;
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
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222 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
223 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 /* 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
225 ssnd->ckID = ssndID;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 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
228 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
229 ssnd->ckDataSize = SDL_SwapBE32(ssnd->ckDataSize);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 if (SDL_RWread(rw, &ssnd->offset, sizeof(ssnd->offset), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 ssnd->offset = SDL_SwapBE32(ssnd->offset);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 if (SDL_RWread(rw, &ssnd->blockSize, sizeof(ssnd->blockSize), 1) != 1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237 ssnd->blockSize = SDL_SwapBE32(ssnd->blockSize);
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 /* Leave the SDL_RWops position indicator at the start of the samples */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240 if (SDL_RWseek(rw, (int) ssnd->offset, SEEK_CUR) == -1) /* !!! FIXME: Int? Really? */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241 return(0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 } /* read_ssnd_chunk */
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
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247 static int find_chunk(SDL_RWops *rw, Uint32 id)
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 Sint32 siz = 0;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 Uint32 _id = 0;
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 while (1)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 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
255 if (SDL_SwapLE32(_id) == id)
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 return(1);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 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
259 siz = SDL_SwapBE32(siz);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260 assert(siz > 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261 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
262 } /* while */
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 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
265 } /* find_chunk */
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
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 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
269 {
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271 SDL_RWops *rw = internal->rw;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 Uint32 chunk_id;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 int bytes_per_sample;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 long pos;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275 comm_t c;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 ssnd_t s;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 aiff_t *a;
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 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
280 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
281
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282 chunk_id = SDL_ReadLE32(rw);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 BAIL_IF_MACRO(chunk_id != aiffID && chunk_id != aifcID,
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284 "AIFF: Not an AIFF or AIFC file.", 0);
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 /* 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
287 pos = SDL_RWtell(rw);
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 BAIL_IF_MACRO(!find_chunk(rw, commID), "AIFF: No common chunk.", 0);
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 BAIL_IF_MACRO(!read_comm_chunk(rw, &c), "AIFF: Can't read common chunk.", 0);
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 /* !!! FIXME: This will have to change for compression types... */
938ef560c7bf Initial add. Thanks, Torbj�rn!
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 BAIL_IF_MACRO(c.compressionType != noneID, "AIFF: Unsupported encoding.", 0);
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294
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295 BAIL_IF_MACRO(c.sampleRate == 0, "AIFF: Unsupported sample rate.", 0);
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296
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297 sample->actual.channels = (Uint8) c.numChannels;
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298 sample->actual.rate = c.sampleRate;
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299
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300 if (c.sampleSize <= 8)
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301 {
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302 sample->actual.format = AUDIO_S8;
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303 bytes_per_sample = 1;
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304 } /* if */
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305 else if (c.sampleSize <= 16)
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306 {
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307 sample->actual.format = AUDIO_S16MSB;
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308 bytes_per_sample = 2;
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309 } /* if */
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310 else
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311 BAIL_MACRO("AIFF: Unsupported sample size.", 0);
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312
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313 SDL_RWseek(rw, pos, SEEK_SET);
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314
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315 BAIL_IF_MACRO(!find_chunk(rw, ssndID), "AIFF: No sound data chunk.", 0);
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316 BAIL_IF_MACRO(!read_ssnd_chunk(rw, &s), "AIFF: Can't read sound data chunk.", 0);
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317
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318 a = (aiff_t *) malloc(sizeof(aiff_t));
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319 BAIL_IF_MACRO(a == NULL, ERR_OUT_OF_MEMORY, 0);
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320 a->bytesLeft = bytes_per_sample * c.numSampleFrames;
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321 internal->decoder_private = (void *) a;
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322
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323 _D(("AIFF: Accepting data stream.\n"));
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324 return(1); /* we'll handle this data. */
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325 } /* AIFF_open */
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326
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327
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328 static void AIFF_close(Sound_Sample *sample)
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329 {
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330 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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331 free(internal->decoder_private);
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332 } /* WAV_close */
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333
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334
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335 static Uint32 AIFF_read(Sound_Sample *sample)
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336 {
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337 Uint32 retval;
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338 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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339 aiff_t *a = (aiff_t *) internal->decoder_private;
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340 Uint32 max = (internal->buffer_size < (Uint32) a->bytesLeft) ?
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341 internal->buffer_size : (Uint32) a->bytesLeft;
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342
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343 assert(max > 0);
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344
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345 /*
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346 * We don't actually do any decoding, so we read the AIFF data
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347 * directly into the internal buffer...
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348 */
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349 retval = SDL_RWread(internal->rw, internal->buffer, 1, max);
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350
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351 a->bytesLeft -= retval;
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352
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353 /* Make sure the read went smoothly... */
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354 if ((retval == 0) || (a->bytesLeft == 0))
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355 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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356
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357 else if (retval == -1)
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358 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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359
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Ryan C. Gordon <icculus@icculus.org>
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360 /* (next call this EAGAIN may turn into an EOF or error.) */
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361 else if (retval < internal->buffer_size)
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Ryan C. Gordon <icculus@icculus.org>
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362 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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363
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Ryan C. Gordon <icculus@icculus.org>
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364 return(retval);
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365 } /* AIFF_read */
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366
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Ryan C. Gordon <icculus@icculus.org>
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367
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Ryan C. Gordon <icculus@icculus.org>
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368 /* end of aiff.c ... */