Mercurial > SDL_sound_CoreAudio
annotate decoders/skeleton.c @ 257:7c4f6ee02cd0
Changed magic number to be bigendian.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 11 Feb 2002 08:30:23 +0000 |
| parents | c9772a9f5271 |
| children | c97be6e1bd27 |
| rev | line source |
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| 16 | 1 /* |
| 2 * SDL_sound -- An abstract sound format decoding API. | |
| 3 * Copyright (C) 2001 Ryan C. Gordon. | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Lesser General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2.1 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 * Lesser General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Lesser General Public | |
| 16 * License along with this library; if not, write to the Free Software | |
| 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 */ | |
| 19 | |
| 20 /* | |
| 21 * FMT decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles FMT audio data. Blahblahblah... The author should | |
| 24 * have done a search and replace on "fmt" and "FMT" and changed this | |
| 25 * comment. This is the default comment in the skeleton decoder file... | |
| 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 COPYING in the source's root directory. |
| 16 | 31 * |
| 32 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 33 */ | |
| 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 |
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44 #ifdef SOUND_SUPPORTS_FMT |
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45 |
| 16 | 46 #include <stdio.h> |
| 47 #include <stdlib.h> | |
| 48 #include <string.h> | |
| 49 #include <assert.h> | |
| 50 | |
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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 FMT_init(void); |
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57 static void FMT_quit(void); |
| 16 | 58 static int FMT_open(Sound_Sample *sample, const char *ext); |
| 59 static void FMT_close(Sound_Sample *sample); | |
| 60 static Uint32 FMT_read(Sound_Sample *sample); | |
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61 static int FMT_rewind(Sound_Sample *sample); |
| 16 | 62 |
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63 static const char *extensions_fmt[] = { "FMT", NULL }; |
| 16 | 64 const Sound_DecoderFunctions __Sound_DecoderFunctions_FMT = |
| 65 { | |
| 66 { | |
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67 extensions_fmt, |
| 16 | 68 "FMT audio format description", |
| 69 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 70 "http://www.icculus.org/SDL_sound/" | |
| 71 }, | |
| 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 */ |
| 16 | 79 }; |
| 80 | |
| 81 | |
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82 static int FMT_init(void) |
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83 { |
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84 /* do any global decoder/library initialization you need here. */ |
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85 |
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86 return(1); /* initialization successful. */ |
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87 } /* FMT_init */ |
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88 |
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89 |
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90 static void FMT_quit(void) |
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91 { |
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92 /* do any global decoder/library cleanup you need here. */ |
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93 } /* FMT_quit */ |
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94 |
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95 |
| 16 | 96 static int FMT_open(Sound_Sample *sample, const char *ext) |
| 97 { | |
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98 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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99 SDL_RWops *rw = internal->rw; |
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100 |
| 16 | 101 if (can NOT accept the data) |
| 102 { | |
| 103 Sound_SetError("FMT: expected X, got Y."); | |
| 104 return(0); | |
| 105 } /* if */ | |
| 106 | |
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107 SNDDBG(("FMT: Accepting data stream.\n")); |
| 16 | 108 set up sample->actual; |
| 109 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 110 return(1); /* we'll handle this data. */ | |
| 111 } /* FMT_open */ | |
| 112 | |
| 113 | |
| 114 static void FMT_close(Sound_Sample *sample) | |
| 115 { | |
| 116 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 117 clean up anything you put into internal->decoder_private; | |
| 118 } /* FMT_close */ | |
| 119 | |
| 120 | |
| 121 static Uint32 FMT_read(Sound_Sample *sample) | |
| 122 { | |
| 123 Uint32 retval; | |
| 124 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 125 | |
| 126 /* | |
| 127 * We don't actually do any decoding, so we read the fmt data | |
| 128 * directly into the internal buffer... | |
| 129 */ | |
| 130 retval = SDL_RWread(internal->rw, internal->buffer, | |
| 131 1, internal->buffer_size); | |
| 132 | |
| 133 (or whatever. Do some decoding here...) | |
| 134 | |
| 135 /* Make sure the read went smoothly... */ | |
| 136 if (retval == 0) | |
| 137 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 138 | |
| 139 else if (retval == -1) | |
| 140 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 141 | |
| 142 /* (next call this EAGAIN may turn into an EOF or error.) */ | |
| 143 else if (retval < internal->buffer_size) | |
| 144 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 145 | |
| 146 (or whatever. retval == number of bytes you put in internal->buffer). | |
| 147 | |
| 148 return(retval); | |
| 149 } /* FMT_read */ | |
| 150 | |
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151 |
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152 static int FMT_rewind(Sound_Sample *sample) |
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153 { |
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154 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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155 |
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156 /* seek to the appropriate place... */ |
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157 BAIL_IF_MACRO(SDL_RWseek(internal->rw, 0, SEEK_SET) != 0, ERR_IO_ERROR, 0); |
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158 |
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159 (reset state as necessary.) |
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160 |
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161 return(1); /* success. */ |
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162 } /* FMT_rewind */ |
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163 |
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164 #endif /* SOUND_SUPPORTS_FMT */ |
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165 |
| 16 | 166 |
| 167 /* end of fmt.c ... */ | |
| 168 |