annotate decoders/skeleton.c @ 565:a737d89af74e

Capitalized some lowercase extensions, to match all the others.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 30 Jan 2009 19:40:21 -0500
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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 * FMT decoder for SDL_sound.
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22 *
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23 * This driver handles FMT audio data. Blahblahblah... The author should
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24 * have done a search and replace on "fmt" and "FMT" and changed this
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25 * comment. This is the default comment in the skeleton decoder file...
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26 *
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27 * None of this code, even the parts that LOOK right, have been compiled,
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28 * so you cut-and-paste at your own risk.
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29 *
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30 * Please see the file LICENSE.txt in the source's root directory.
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31 *
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32 * This file written by Ryan C. Gordon. (icculus@icculus.org)
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33 */
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34
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35 #error DO NOT COMPILE THIS.
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36 #error This is an example decoder skeleton.
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37 #error You should base your code on this file, and remove these error lines
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38 #error from your version.
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39
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40 #if HAVE_CONFIG_H
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41 # include <config.h>
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42 #endif
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43
103
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44 #ifdef SOUND_SUPPORTS_FMT
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45
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46 #include <stdio.h>
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47 #include <stdlib.h>
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48 #include <string.h>
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49
106
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50 #include "SDL_sound.h"
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51
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52 #define __SDL_SOUND_INTERNAL__
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53 #include "SDL_sound_internal.h"
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54
47
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55 static int FMT_init(void);
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56 static void FMT_quit(void);
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57 static int FMT_open(Sound_Sample *sample, const char *ext);
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58 static void FMT_close(Sound_Sample *sample);
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59 static Uint32 FMT_read(Sound_Sample *sample);
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60 static int FMT_rewind(Sound_Sample *sample);
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61 static int FMT_seek(Sound_Sample *sample, Uint32 ms);
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62
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63 static const char *extensions_fmt[] = { "FMT", NULL };
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64 const Sound_DecoderFunctions __Sound_DecoderFunctions_FMT =
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65 {
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66 {
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67 extensions_fmt,
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68 "FMT audio format description",
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69 "Ryan C. Gordon <icculus@icculus.org>",
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70 "http://www.icculus.org/SDL_sound/"
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71 },
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72
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73 FMT_init, /* init() method */
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74 FMT_quit, /* quit() method */
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75 FMT_open, /* open() method */
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76 FMT_close, /* close() method */
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77 FMT_read, /* read() method */
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78 FMT_rewind, /* rewind() method */
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79 FMT_seek /* seek() method */
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80 };
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81
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82
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83 static int FMT_init(void)
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84 {
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85 /* do any global decoder/library initialization you need here. */
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86
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87 return(1); /* initialization successful. */
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88 } /* FMT_init */
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89
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90
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91 static void FMT_quit(void)
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92 {
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93 /* do any global decoder/library cleanup you need here. */
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94 } /* FMT_quit */
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95
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96
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97 static int FMT_open(Sound_Sample *sample, const char *ext)
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98 {
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99 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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100 SDL_RWops *rw = internal->rw;
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101
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102 if (can NOT accept the data)
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103 BAIL_MACRO("FMT: expected X, got Y.", 0);
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104
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105 SNDDBG(("FMT: Accepting data stream.\n"));
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106 set up sample->actual;
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107 sample->flags = SOUND_SAMPLEFLAG_NONE;
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108 return(1); /* we'll handle this data. */
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109 } /* FMT_open */
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110
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111
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112 static void FMT_close(Sound_Sample *sample)
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113 {
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114 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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115 clean up anything you put into internal->decoder_private;
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116 } /* FMT_close */
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117
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118
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119 static Uint32 FMT_read(Sound_Sample *sample)
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120 {
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121 Uint32 retval;
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122 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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123
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124 /*
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125 * We don't actually do any decoding, so we read the fmt data
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126 * directly into the internal buffer...
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127 */
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128 retval = SDL_RWread(internal->rw, internal->buffer,
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129 1, internal->buffer_size);
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130
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131 (or whatever. Do some decoding here...)
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132
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133 /* Make sure the read went smoothly... */
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134 if (retval == 0)
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135 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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136
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137 else if (retval == -1)
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138 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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139
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140 /* (next call this EAGAIN may turn into an EOF or error.) */
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141 else if (retval < internal->buffer_size)
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142 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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143
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144 (or whatever. retval == number of bytes you put in internal->buffer).
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145
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146 return(retval);
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147 } /* FMT_read */
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148
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150 static int FMT_rewind(Sound_Sample *sample)
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151 {
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152 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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153
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154 /* seek to the appropriate place... */
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155 BAIL_IF_MACRO(SDL_RWseek(internal->rw, 0, SEEK_SET) != 0, ERR_IO_ERROR, 0);
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156
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157 (reset state as necessary.)
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158
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159 return(1); /* success. */
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160 } /* FMT_rewind */
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161
306
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162
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163 static int FMT_seek(Sound_Sample *sample, Uint32 ms)
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164 {
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165 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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166
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167 /* seek to the appropriate place... */
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168 BAIL_IF_MACRO(SDL_RWseek(internal->rw, 0, SEEK_SET) != 0, ERR_IO_ERROR, 0);
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169
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170 (set state as necessary.)
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171
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172 return(1); /* success. */
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173 } /* FMT_seek */
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174
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175
64
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176 #endif /* SOUND_SUPPORTS_FMT */
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177
16
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178
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179 /* end of fmt.c ... */
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180