annotate decoders/au.c @ 252:c54eae85f5f1

Upped version to 0.1.5.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 08 Feb 2002 01:42:00 +0000
parents c9772a9f5271
children 7c4f6ee02cd0
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 #include <assert.h>
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40
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41 #include "SDL_sound.h"
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42
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43 #define __SDL_SOUND_INTERNAL__
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44 #include "SDL_sound_internal.h"
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45
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46 static int AU_init(void);
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47 static void AU_quit(void);
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48 static int AU_open(Sound_Sample *sample, const char *ext);
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49 static void AU_close(Sound_Sample *sample);
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50 static Uint32 AU_read(Sound_Sample *sample);
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51 static int AU_rewind(Sound_Sample *sample);
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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 };
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75
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76 /* no init/deinit needed */
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77 static int AU_init(void)
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78 {
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79 return(1);
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80 } /* AU_init */
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81
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82 static void AU_quit(void)
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83 {
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84 /* no-op. */
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85 } /* AU_quit */
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86
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87 struct au_file_hdr
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88 {
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89 Uint32 magic;
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90 Uint32 hdr_size;
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91 Uint32 data_size;
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92 Uint32 encoding;
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93 Uint32 sample_rate;
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94 Uint32 channels;
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95 };
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96
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97 #define HDR_SIZE 24
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98
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99 enum
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100 {
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101 AU_ENC_ULAW_8 = 1, /* 8-bit ISDN µ-law */
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102 AU_ENC_LINEAR_8 = 2, /* 8-bit linear PCM */
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103 AU_ENC_LINEAR_16 = 3, /* 16-bit linear PCM */
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104
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105 /* the rest are unsupported (I have never seen them in the wild) */
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106 AU_ENC_LINEAR_24 = 4, /* 24-bit linear PCM */
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107 AU_ENC_LINEAR_32 = 5, /* 32-bit linear PCM */
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108 AU_ENC_FLOAT = 6, /* 32-bit IEEE floating point */
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109 AU_ENC_DOUBLE = 7, /* 64-bit IEEE floating point */
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110 /* more Sun formats, not supported either */
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111 AU_ENC_ADPCM_G721 = 23,
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112 AU_ENC_ADPCM_G722 = 24,
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113 AU_ENC_ADPCM_G723_3 = 25,
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114 AU_ENC_ADPCM_G723_5 = 26,
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115 AU_ENC_ALAW_8 = 27
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116 };
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117
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118 struct audec
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119 {
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120 Uint32 total;
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121 Uint32 remaining;
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122 Uint32 start_offset;
213
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123 int encoding;
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124 };
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125
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126
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127 #define AU_MAGIC 0x646E732E /* ".snd", in ASCII */
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128
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129 static int AU_open(Sound_Sample *sample, const char *ext)
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130 {
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131 Sound_SampleInternal *internal = sample->opaque;
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132 SDL_RWops *rw = internal->rw;
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133 int r, skip, hsize, i;
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134 struct au_file_hdr hdr;
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135 char c;
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136 struct audec *dec = malloc(sizeof *dec);
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137 BAIL_IF_MACRO(dec == NULL, ERR_OUT_OF_MEMORY, 0);
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138 internal->decoder_private = dec;
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139
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140 r = SDL_RWread(rw, &hdr, 1, HDR_SIZE);
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141 if (r < HDR_SIZE)
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142 {
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143 Sound_SetError("No .au file (bad header)");
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144 free(dec);
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145 return(0);
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146 } /* if */
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147
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148 /*
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149 * !!! FIXME: For correctness, we should calculate this as a bigendian
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150 * !!! FIXME: number, which means swapping AU_MAGIC around.
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151 */
213
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152 if (SDL_SwapLE32(hdr.magic) == AU_MAGIC)
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153 {
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154 /* valid magic */
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155 dec->encoding = SDL_SwapBE32(hdr.encoding);
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156 switch(dec->encoding)
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157 {
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158 case AU_ENC_ULAW_8:
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159 /* Convert 8-bit µ-law to 16-bit linear on the fly. This is
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160 slightly wasteful if the audio driver must convert them
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161 back, but µ-law only devices are rare (mostly _old_ Suns) */
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162 sample->actual.format = AUDIO_S16SYS;
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163 break;
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164
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165 case AU_ENC_LINEAR_8:
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166 sample->actual.format = AUDIO_S8;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
167 break;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
168
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
169 case AU_ENC_LINEAR_16:
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
170 sample->actual.format = AUDIO_S16MSB;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
171 break;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
172
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
173 default:
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
174 Sound_SetError("Unsupported .au encoding");
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
175 free(dec);
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
176 return 0;
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
177 } /* switch */
213
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
178
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
179 sample->actual.rate = SDL_SwapBE32(hdr.sample_rate);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
180 sample->actual.channels = SDL_SwapBE32(hdr.channels);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
181 dec->remaining = SDL_SwapBE32(hdr.data_size);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
182 hsize = SDL_SwapBE32(hdr.hdr_size);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
183
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
184 /* skip remaining part of header (input may be unseekable) */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
185 for (i = HDR_SIZE; i < hsize; i++)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
186 SDL_RWread(rw, &c, 1, 1);
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
187 } /* if */
213
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 else if (__Sound_strcasecmp(ext, "au") == 0)
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190 {
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191 /*
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192 * A number of files in the wild have the .au extension but no valid
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193 * header; these are traditionally assumed to be 8kHz µ-law. Handle
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194 * them here only if the extension is recognized.
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195 */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197 SNDDBG(("AU: Invalid header, assuming raw 8kHz µ-law.\n"));
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
198 /* if seeking fails, we lose 24 samples. big deal */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199 SDL_RWseek(rw, -HDR_SIZE, SEEK_CUR);
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 dec->encoding = AU_ENC_ULAW_8;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201 dec->remaining = (Uint32)-1; /* no limit */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 sample->actual.format = AUDIO_S16SYS;
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
203 sample->actual.rate = 8000;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
204 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
205 } /* else if */
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
206
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
207 else
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
208 {
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
209 SNDDBG(("AU: Not an .AU stream.\n"));
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
210 free(dec);
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
211 return(0);
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
212 } /* else */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 sample->flags = SOUND_SAMPLEFLAG_NONE;
221
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
215 dec->total = dec->remaining;
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
216 dec->start_offset = SDL_RWtell(rw);
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 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
219 return(1);
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
220 } /* AU_open */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221
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 static void AU_close(Sound_Sample *sample)
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 Sound_SampleInternal *internal = sample->opaque;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226 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
227 } /* AU_close */
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
228
213
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 /* table to convert from µ-law encoding to signed 16-bit samples,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 generated by a throwaway perl script */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 static Sint16 ulaw_to_linear[256] = {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 -32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234 -23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 -15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 -11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237 -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239 -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240 -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241 -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242 -1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 -876, -844, -812, -780, -748, -716, -684, -652,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 -620, -588, -556, -524, -492, -460, -428, -396,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245 -372, -356, -340, -324, -308, -292, -276, -260,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246 -244, -228, -212, -196, -180, -164, -148, -132,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247 -120, -112, -104, -96, -88, -80, -72, -64,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
248 -56, -48, -40, -32, -24, -16, -8, 0,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
249 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
251 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259 876, 844, 812, 780, 748, 716, 684, 652,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260 620, 588, 556, 524, 492, 460, 428, 396,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261 372, 356, 340, 324, 308, 292, 276, 260,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262 244, 228, 212, 196, 180, 164, 148, 132,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 120, 112, 104, 96, 88, 80, 72, 64,
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264 56, 48, 40, 32, 24, 16, 8, 0
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 };
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
267
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 static Uint32 AU_read(Sound_Sample *sample)
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 int ret;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271 Sound_SampleInternal *internal = sample->opaque;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 struct audec *dec = internal->decoder_private;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 int maxlen;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 Uint8 *buf;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 maxlen = internal->buffer_size;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 buf = internal->buffer;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 if (dec->encoding == AU_ENC_ULAW_8)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
280 /* We read µ-law samples into the second half of the buffer, so
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
281 we can expand them to 16-bit samples afterwards */
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282 maxlen >>= 1;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 buf += maxlen;
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
284 } /* if */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285
221
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
286 if (maxlen > dec->remaining)
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287 maxlen = dec->remaining;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288 ret = SDL_RWread(internal->rw, buf, 1, maxlen);
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289 if (ret == 0)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 sample->flags |= SOUND_SAMPLEFLAG_EOF;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291 else if (ret == -1)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 else
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
294 {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295 dec->remaining -= ret;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
296 if (ret < maxlen)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
297 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
298
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
299 if (dec->encoding == AU_ENC_ULAW_8)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
300 {
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
301 int i;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
302 Sint16 *dst = internal->buffer;
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
303 for (i = 0; i < ret; i++)
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
304 dst[i] = ulaw_to_linear[buf[i]];
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
305 ret <<= 1; /* return twice as much as read */
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
306 } /* if */
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
307 } /* else */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
308
217
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
309 return(ret);
9bab949e2318 Fixed memory leak I introduced, mangled coding style some more. :)
Ryan C. Gordon <icculus@icculus.org>
parents: 213
diff changeset
310 } /* AU_read */
213
948b62500a54 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
311
221
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
312
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
313 static int AU_rewind(Sound_Sample *sample)
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
314 {
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
315 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
316 struct audec *dec = (struct audec *) internal->decoder_private;
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
317 int rc = SDL_RWseek(internal->rw, dec->start_offset, SEEK_SET);
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
318 BAIL_IF_MACRO(rc != dec->start_offset, ERR_IO_ERROR, 0);
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 217
diff changeset
319 dec->remaining = dec->total;
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
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320 return(1);
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321 } /* AU_rewind */
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322
213
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323 #endif /* SOUND_SUPPORTS_AU */
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324