annotate decoders/au.c @ 497:0b244f36049e

Trimmed a bunch of junk out of the build system, and now it works on Mac OS X again.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 06 Dec 2005 11:44:29 +0000
parents 3e705c9180e5
children 8a814bbbedfa
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 * Sun/NeXT .au decoder for SDL_sound.
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22 * Formats supported: 8 and 16 bit linear PCM, 8 bit µ-law.
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23 * Files without valid header are assumed to be 8 bit µ-law, 8kHz, mono.
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24 *
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25 * Please see the file COPYING in the source's root directory.
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26 *
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27 * This file written by Mattias Engdegård. (f91-men@nada.kth.se)
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28 */
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29
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30 #if HAVE_CONFIG_H
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31 # include <config.h>
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32 #endif
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33
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34 #ifdef SOUND_SUPPORTS_AU
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35
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36 #include <stdio.h>
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37 #include <stdlib.h>
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38 #include <string.h>
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39
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40 #include "SDL_sound.h"
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41
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42 #define __SDL_SOUND_INTERNAL__
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43 #include "SDL_sound_internal.h"
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44
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45 static int AU_init(void);
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46 static void AU_quit(void);
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47 static int AU_open(Sound_Sample *sample, const char *ext);
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48 static void AU_close(Sound_Sample *sample);
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49 static Uint32 AU_read(Sound_Sample *sample);
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50 static int AU_rewind(Sound_Sample *sample);
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51 static int AU_seek(Sound_Sample *sample, Uint32 ms);
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52
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53 /*
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54 * Sometimes the extension ".snd" is used for these files (mostly on the NeXT),
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55 * and the magic number comes from this. However it may clash with other
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56 * formats and is somewhat of an anachronism, so only .au is used here.
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57 */
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58 static const char *extensions_au[] = { "AU", NULL };
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59 const Sound_DecoderFunctions __Sound_DecoderFunctions_AU =
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60 {
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61 {
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62 extensions_au,
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63 "Sun/NeXT audio file format",
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64 "Mattias Engdegård <f91-men@nada.kth.se>",
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65 "http://www.icculus.org/SDL_sound/"
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66 },
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67
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68 AU_init, /* init() method */
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69 AU_quit, /* quit() method */
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70 AU_open, /* open() method */
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71 AU_close, /* close() method */
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72 AU_read, /* read() method */
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73 AU_rewind, /* rewind() method */
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74 AU_seek /* seek() method */
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75 };
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76
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77 /* no init/deinit needed */
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78 static int AU_init(void)
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79 {
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80 return(1);
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81 } /* AU_init */
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82
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83 static void AU_quit(void)
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84 {
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85 /* no-op. */
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86 } /* AU_quit */
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87
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88 struct au_file_hdr
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89 {
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90 Uint32 magic;
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91 Uint32 hdr_size;
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92 Uint32 data_size;
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93 Uint32 encoding;
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94 Uint32 sample_rate;
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95 Uint32 channels;
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96 };
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97
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98 #define HDR_SIZE 24
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99
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100 enum
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101 {
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102 AU_ENC_ULAW_8 = 1, /* 8-bit ISDN µ-law */
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103 AU_ENC_LINEAR_8 = 2, /* 8-bit linear PCM */
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104 AU_ENC_LINEAR_16 = 3, /* 16-bit linear PCM */
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105
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106 /* the rest are unsupported (I have never seen them in the wild) */
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107 AU_ENC_LINEAR_24 = 4, /* 24-bit linear PCM */
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108 AU_ENC_LINEAR_32 = 5, /* 32-bit linear PCM */
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109 AU_ENC_FLOAT = 6, /* 32-bit IEEE floating point */
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110 AU_ENC_DOUBLE = 7, /* 64-bit IEEE floating point */
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111 /* more Sun formats, not supported either */
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112 AU_ENC_ADPCM_G721 = 23,
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113 AU_ENC_ADPCM_G722 = 24,
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114 AU_ENC_ADPCM_G723_3 = 25,
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115 AU_ENC_ADPCM_G723_5 = 26,
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116 AU_ENC_ALAW_8 = 27
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117 };
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118
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119 struct audec
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120 {
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121 Uint32 total;
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122 Uint32 remaining;
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123 Uint32 start_offset;
213
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124 int encoding;
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125 };
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126
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127
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128 /*
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129 * Read in the AU header from disk. This makes this process safe
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130 * regardless of the processor's byte order or how the au_file_hdr
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131 * structure is packed.
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132 */
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133 static int read_au_header(SDL_RWops *rw, struct au_file_hdr *hdr)
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134 {
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135 if (SDL_RWread(rw, &hdr->magic, sizeof (hdr->magic), 1) != 1)
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136 return(0);
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137 hdr->magic = SDL_SwapBE32(hdr->magic);
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138
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139 if (SDL_RWread(rw, &hdr->hdr_size, sizeof (hdr->hdr_size), 1) != 1)
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140 return(0);
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141 hdr->hdr_size = SDL_SwapBE32(hdr->hdr_size);
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142
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143 if (SDL_RWread(rw, &hdr->data_size, sizeof (hdr->data_size), 1) != 1)
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144 return(0);
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145 hdr->data_size = SDL_SwapBE32(hdr->data_size);
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146
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147 if (SDL_RWread(rw, &hdr->encoding, sizeof (hdr->encoding), 1) != 1)
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148 return(0);
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149 hdr->encoding = SDL_SwapBE32(hdr->encoding);
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150
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151 if (SDL_RWread(rw, &hdr->sample_rate, sizeof (hdr->sample_rate), 1) != 1)
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152 return(0);
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153 hdr->sample_rate = SDL_SwapBE32(hdr->sample_rate);
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154
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155 if (SDL_RWread(rw, &hdr->channels, sizeof (hdr->channels), 1) != 1)
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156 return(0);
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157 hdr->channels = SDL_SwapBE32(hdr->channels);
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158
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159 return(1);
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
160 } /* read_au_header */
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
161
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
162
257
7c4f6ee02cd0 Changed magic number to be bigendian.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
163 #define AU_MAGIC 0x2E736E64 /* ".snd", in ASCII (bigendian number) */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
164
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
165 static int AU_open(Sound_Sample *sample, const char *ext)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
166 {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
167 Sound_SampleInternal *internal = sample->opaque;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
168 SDL_RWops *rw = internal->rw;
474
c66080364dff Most decoders now report total sample play time, now. Technically, this
Ryan C. Gordon <icculus@icculus.org>
parents: 387
diff changeset
169 int skip, hsize, i, bytes_per_second;
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
170 struct au_file_hdr hdr;
330
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
171 struct audec *dec;
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
172 char c;
330
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
173
387
fb519e6028e3 Changed all the Sound_SetError() calls to __Sound_SetError (or BAIL*_MACRO)
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
174 /* read_au_header() will do byte order swapping. */
fb519e6028e3 Changed all the Sound_SetError() calls to __Sound_SetError (or BAIL*_MACRO)
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
175 BAIL_IF_MACRO(!read_au_header(rw, &hdr), "AU: bad header", 0);
330
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
176
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
177 dec = malloc(sizeof *dec);
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
178 BAIL_IF_MACRO(dec == NULL, ERR_OUT_OF_MEMORY, 0);
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
179 internal->decoder_private = dec;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
180
330
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
181 if (hdr.magic == AU_MAGIC)
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
182 {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
183 /* valid magic */
330
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
184 dec->encoding = hdr.encoding;
213
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
185 switch(dec->encoding)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
186 {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
187 case AU_ENC_ULAW_8:
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188 /* Convert 8-bit µ-law to 16-bit linear on the fly. This is
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 slightly wasteful if the audio driver must convert them
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190 back, but µ-law only devices are rare (mostly _old_ Suns) */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191 sample->actual.format = AUDIO_S16SYS;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192 break;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194 case AU_ENC_LINEAR_8:
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195 sample->actual.format = AUDIO_S8;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196 break;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
198 case AU_ENC_LINEAR_16:
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199 sample->actual.format = AUDIO_S16MSB;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 break;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 default:
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
203 free(dec);
387
fb519e6028e3 Changed all the Sound_SetError() calls to __Sound_SetError (or BAIL*_MACRO)
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
204 BAIL_MACRO("AU: Unsupported .au encoding", 0);
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
205 } /* switch */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
206
330
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
207 sample->actual.rate = hdr.sample_rate;
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
208 sample->actual.channels = hdr.channels;
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
209 dec->remaining = hdr.data_size;
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
210 hsize = hdr.hdr_size;
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
211
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 /* skip remaining part of header (input may be unseekable) */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 for (i = HDR_SIZE; i < hsize; i++)
330
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
214 {
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
215 if (SDL_RWread(rw, &c, 1, 1) != 1)
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
216 {
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
217 free(dec);
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
218 BAIL_MACRO(ERR_IO_ERROR, 0);
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
219 } /* if */
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
220 } /* for */
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
221 } /* if */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
223 else if (__Sound_strcasecmp(ext, "au") == 0)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 /*
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226 * A number of files in the wild have the .au extension but no valid
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 * header; these are traditionally assumed to be 8kHz µ-law. Handle
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
228 * them here only if the extension is recognized.
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
229 */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 SNDDBG(("AU: Invalid header, assuming raw 8kHz µ-law.\n"));
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 /* if seeking fails, we lose 24 samples. big deal */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 SDL_RWseek(rw, -HDR_SIZE, SEEK_CUR);
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234 dec->encoding = AU_ENC_ULAW_8;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 dec->remaining = (Uint32)-1; /* no limit */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 sample->actual.format = AUDIO_S16SYS;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237 sample->actual.rate = 8000;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 sample->actual.channels = 1;
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
239 } /* else if */
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
240
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
241 else
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
242 {
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
243 free(dec);
387
fb519e6028e3 Changed all the Sound_SetError() calls to __Sound_SetError (or BAIL*_MACRO)
Ryan C. Gordon <icculus@icculus.org>
parents: 377
diff changeset
244 BAIL_MACRO("AU: Not an .AU stream.", 0);
474
c66080364dff Most decoders now report total sample play time, now. Technically, this
Ryan C. Gordon <icculus@icculus.org>
parents: 387
diff changeset
245 } /* else */
c66080364dff Most decoders now report total sample play time, now. Technically, this
Ryan C. Gordon <icculus@icculus.org>
parents: 387
diff changeset
246
c66080364dff Most decoders now report total sample play time, now. Technically, this
Ryan C. Gordon <icculus@icculus.org>
parents: 387
diff changeset
247 bytes_per_second = ( ( dec->encoding == AU_ENC_LINEAR_16 ) ? 2 : 1 )
c66080364dff Most decoders now report total sample play time, now. Technically, this
Ryan C. Gordon <icculus@icculus.org>
parents: 387
diff changeset
248 * sample->actual.rate * sample->actual.channels ;
477
3e705c9180e5 Fixed binary compatibility, added Sound_GetDuration().
Ryan C. Gordon <icculus@icculus.org>
parents: 474
diff changeset
249 internal->total_time = ((dec->remaining == -1) ? (-1) :
3e705c9180e5 Fixed binary compatibility, added Sound_GetDuration().
Ryan C. Gordon <icculus@icculus.org>
parents: 474
diff changeset
250 ( ( dec->remaining / bytes_per_second ) * 1000 ) +
3e705c9180e5 Fixed binary compatibility, added Sound_GetDuration().
Ryan C. Gordon <icculus@icculus.org>
parents: 474
diff changeset
251 ( ( dec->remaining % bytes_per_second ) * 1000 /
3e705c9180e5 Fixed binary compatibility, added Sound_GetDuration().
Ryan C. Gordon <icculus@icculus.org>
parents: 474
diff changeset
252 bytes_per_second ) );
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253
330
a81976ed5df7 Cleanups for robustness, potentially buggy seek method implementation.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
254 sample->flags = SOUND_SAMPLEFLAG_CANSEEK;
221
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
255 dec->total = dec->remaining;
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
256 dec->start_offset = SDL_RWtell(rw);
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 SNDDBG(("AU: Accepting data stream.\n"));
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
259 return(1);
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
260 } /* AU_open */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 static void AU_close(Sound_Sample *sample)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264 {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 Sound_SampleInternal *internal = sample->opaque;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266 free(internal->decoder_private);
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
267 } /* AU_close */
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
268
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270 /* table to convert from µ-law encoding to signed 16-bit samples,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271 generated by a throwaway perl script */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 static Sint16 ulaw_to_linear[256] = {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 -32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 -23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275 -15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 -11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
280 -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
281 -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282 -1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 -876, -844, -812, -780, -748, -716, -684, -652,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284 -620, -588, -556, -524, -492, -460, -428, -396,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285 -372, -356, -340, -324, -308, -292, -276, -260,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 -244, -228, -212, -196, -180, -164, -148, -132,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287 -120, -112, -104, -96, -88, -80, -72, -64,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288 -56, -48, -40, -32, -24, -16, -8, 0,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
294 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
296 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
297 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
298 1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
299 876, 844, 812, 780, 748, 716, 684, 652,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
300 620, 588, 556, 524, 492, 460, 428, 396,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
301 372, 356, 340, 324, 308, 292, 276, 260,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
302 244, 228, 212, 196, 180, 164, 148, 132,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
303 120, 112, 104, 96, 88, 80, 72, 64,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
304 56, 48, 40, 32, 24, 16, 8, 0
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
305 };
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
306
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
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307
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308 static Uint32 AU_read(Sound_Sample *sample)
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309 {
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310 int ret;
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311 Sound_SampleInternal *internal = sample->opaque;
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312 struct audec *dec = internal->decoder_private;
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313 int maxlen;
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314 Uint8 *buf;
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315
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316 maxlen = internal->buffer_size;
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317 buf = internal->buffer;
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318 if (dec->encoding == AU_ENC_ULAW_8)
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319 {
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320 /* We read µ-law samples into the second half of the buffer, so
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321 we can expand them to 16-bit samples afterwards */
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322 maxlen >>= 1;
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323 buf += maxlen;
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324 } /* if */
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325
221
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326 if (maxlen > dec->remaining)
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327 maxlen = dec->remaining;
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328 ret = SDL_RWread(internal->rw, buf, 1, maxlen);
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329 if (ret == 0)
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330 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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331 else if (ret == -1)
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332 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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333 else
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334 {
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335 dec->remaining -= ret;
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336 if (ret < maxlen)
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337 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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338
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339 if (dec->encoding == AU_ENC_ULAW_8)
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340 {
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341 int i;
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342 Sint16 *dst = internal->buffer;
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343 for (i = 0; i < ret; i++)
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344 dst[i] = ulaw_to_linear[buf[i]];
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345 ret <<= 1; /* return twice as much as read */
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346 } /* if */
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347 } /* else */
213
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348
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349 return(ret);
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350 } /* AU_read */
213
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351
221
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352
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353 static int AU_rewind(Sound_Sample *sample)
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354 {
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355 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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356 struct audec *dec = (struct audec *) internal->decoder_private;
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357 int rc = SDL_RWseek(internal->rw, dec->start_offset, SEEK_SET);
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358 BAIL_IF_MACRO(rc != dec->start_offset, ERR_IO_ERROR, 0);
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359 dec->remaining = dec->total;
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360 return(1);
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361 } /* AU_rewind */
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362
306
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363
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364 static int AU_seek(Sound_Sample *sample, Uint32 ms)
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365 {
330
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366 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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367 struct audec *dec = (struct audec *) internal->decoder_private;
331
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368 int offset = __Sound_convertMsToBytePos(&sample->actual, ms);
330
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369 int rc;
331
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370 int pos;
330
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371
331
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372 if (dec->encoding == AU_ENC_ULAW_8)
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373 offset >>= 1; /* halve the byte offset for compression. */
330
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374
331
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375 pos = (int) (dec->start_offset + offset);
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376 rc = SDL_RWseek(internal->rw, pos, SEEK_SET);
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377 BAIL_IF_MACRO(rc != pos, ERR_IO_ERROR, 0);
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378 dec->remaining = dec->total - offset;
330
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379 return(1);
306
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380 } /* AU_seek */
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381
213
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382 #endif /* SOUND_SUPPORTS_AU */
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383