Mercurial > SDL_sound_CoreAudio

annotate decoders/raw.c @ 526:2df1f5c62d38

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Updated my email address.
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 06 Aug 2007 09:44:02 +0000
parents 3e705c9180e5
children 2e8907ff98e9
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 * RAW decoder for SDL_sound. This is as simple as it gets.
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22 *
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23 * This driver handles raw audio data. You must, regardless of where the
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24 * data is actually coming from, specify the string "RAW" in the extension
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25 * parameter of Sound_NewSample() (or, alternately, open a file with the
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26 * extension ".raw" in Sound_NewSampleFromFile()). The string is checked
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27 * case-insensitive. We need this check, because raw data, being raw, has
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28 * no headers or magic number we can use to determine if we should handle a
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29 * given file, so we needed some way to have this "decoder" discriminate.
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30 *
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31 * When calling Sound_NewSample*(), you must also specify a "desired"
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32 * audio format. The "actual" format will always match what you specify, so
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33 * there will be no conversion overhead, but these routines need to know how
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34 * to treat the bits, since it's all random garbage otherwise.
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35 *
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36 * Please see the file COPYING in the source's root directory.
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37 *
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38 * This file written by Ryan C. Gordon. (icculus@icculus.org)
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39 */
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40
106
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41 #if HAVE_CONFIG_H
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42 # include <config.h>
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43 #endif
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44
104
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45 #ifdef SOUND_SUPPORTS_RAW
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46
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47 #include <stdio.h>
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48 #include <stdlib.h>
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49 #include <string.h>
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50
106
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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 static int RAW_init(void);
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57 static void RAW_quit(void);
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58 static int RAW_open(Sound_Sample *sample, const char *ext);
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59 static void RAW_close(Sound_Sample *sample);
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60 static Uint32 RAW_read(Sound_Sample *sample);
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61 static int RAW_rewind(Sound_Sample *sample);
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62 static int RAW_seek(Sound_Sample *sample, Uint32 ms);
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63
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64 static const char *extensions_raw[] = { "RAW", NULL };
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65 const Sound_DecoderFunctions __Sound_DecoderFunctions_RAW =
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66 {
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67 {
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68 extensions_raw,
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69 "Raw audio",
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70 "Ryan C. Gordon <icculus@icculus.org>",
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71 "http://www.icculus.org/SDL_sound/"
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72 },
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74 RAW_init, /* init() method */
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75 RAW_quit, /* quit() method */
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76 RAW_open, /* open() method */
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77 RAW_close, /* close() method */
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78 RAW_read, /* read() method */
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79 RAW_rewind, /* rewind() method */
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80 RAW_seek /* seek() method */
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81 };
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82
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83
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84 static int RAW_init(void)
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85 {
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86 return(1); /* always succeeds. */
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87 } /* RAW_init */
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88
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89
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90 static void RAW_quit(void)
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91 {
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92 /* it's a no-op. */
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93 } /* RAW_quit */
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94
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96 static int RAW_open(Sound_Sample *sample, const char *ext)
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97 {
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98 Sound_SampleInternal *internal = sample->opaque;
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99 SDL_RWops *rw = internal->rw;
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100 Uint32 pos, sample_rate;
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101
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102 /*
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103 * We check this explicitly, since we have no other way to
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104 * determine whether we should handle this data or not.
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105 */
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106 if (__Sound_strcasecmp(ext, "RAW") != 0)
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107 BAIL_MACRO("RAW: extension isn't explicitly \"RAW\".", 0);
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108
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109 /*
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110 * You must also specify a desired format, so we know how to
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111 * treat the bits that are otherwise binary garbage.
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112 */
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113 if ( (sample->desired.channels < 1) ||
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114 (sample->desired.channels > 2) ||
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115 (sample->desired.rate == 0) ||
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116 (sample->desired.format == 0) )
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117 {
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118 BAIL_MACRO("RAW: invalid desired format.", 0);
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119 } /* if */
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120
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121 SNDDBG(("RAW: Accepting data stream.\n"));
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122
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123 /*
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124 * We never convert raw samples; what you ask for is what you get.
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125 */
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126 memcpy(&sample->actual, &sample->desired, sizeof (Sound_AudioInfo));
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127 sample->flags = SOUND_SAMPLEFLAG_CANSEEK;
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128
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129 if ( (pos = SDL_RWseek(internal->rw, 0, SEEK_END) ) <= 0) {
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130 BAIL_MACRO("RAW: cannot seek the end of the file \"RAW\".", 0);
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131 }
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132 if ( SDL_RWseek(internal->rw, 0, SEEK_SET) ) {
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133 BAIL_MACRO("RAW: cannot reset file \"RAW\".", 0);
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134 }
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135
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136 sample_rate = (sample->actual.rate * sample->actual.channels
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137 * ( (sample->actual.format & 0x0018) >> 3) );
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138 internal->total_time = ( pos ) / sample_rate * 1000;
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139 internal->total_time += (pos % sample_rate) * 1000 / sample_rate;
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140
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141 return(1); /* we'll handle this data. */
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142 } /* RAW_open */
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143
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144
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145 static void RAW_close(Sound_Sample *sample)
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146 {
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147 /* we don't allocate anything that we need to free. That's easy, eh? */
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148 } /* RAW_close */
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149
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150
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151 static Uint32 RAW_read(Sound_Sample *sample)
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152 {
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153 Uint32 retval;
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154 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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155
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156 /*
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157 * We don't actually do any decoding, so we read the raw data
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158 * directly into the internal buffer...
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159 */
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160 retval = SDL_RWread(internal->rw, internal->buffer,
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161 1, internal->buffer_size);
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162
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163 /* Make sure the read went smoothly... */
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164 if (retval == 0)
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165 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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166
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167 else if (retval == -1)
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168 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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169
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170 /* (next call this EAGAIN may turn into an EOF or error.) */
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171 else if (retval < internal->buffer_size)
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172 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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173
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174 return(retval);
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175 } /* RAW_read */
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176
221
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177
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178 static int RAW_rewind(Sound_Sample *sample)
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179 {
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180 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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181 BAIL_IF_MACRO(SDL_RWseek(internal->rw, 0, SEEK_SET) != 0, ERR_IO_ERROR, 0);
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182 return(1);
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183 } /* RAW_rewind */
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184
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185
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186 static int RAW_seek(Sound_Sample *sample, Uint32 ms)
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187 {
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188 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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189 int pos = (int) __Sound_convertMsToBytePos(&sample->actual, ms);
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190 int err = (SDL_RWseek(internal->rw, pos, SEEK_SET) != pos);
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191 BAIL_IF_MACRO(err, ERR_IO_ERROR, 0);
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192 return(1);
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193 } /* RAW_seek */
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194
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195
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196 #endif /* SOUND_SUPPORTS_RAW */
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197
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198
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199 /* end of raw.c ... */
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200