Mercurial > SDL_sound_CoreAudio
annotate decoders/raw.c @ 212:8c2cb920a383
Changed the magic number macro to be more uniform with other decoders.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 13 Jan 2002 19:46:04 +0000 |
| parents | 47cc2de2ae36 |
| children | c9772a9f5271 |
| rev | line source |
|---|---|
| 4 | 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 * RAW decoder for SDL_sound. This is as simple as it gets. | |
| 22 * | |
| 23 * This driver handles raw audio data. You must, regardless of where the | |
| 24 * data is actually coming from, specify the string "RAW" in the extension | |
| 25 * parameter of Sound_NewSample() (or, alternately, open a file with the | |
| 26 * extension ".raw" in Sound_NewSampleFromFile()). The string is checked | |
| 27 * case-insensitive. We need this check, because raw data, being raw, has | |
| 28 * no headers or magic number we can use to determine if we should handle a | |
| 29 * given file, so we needed some way to have this "decoder" discriminate. | |
| 30 * | |
| 31 * When calling Sound_NewSample*(), you must also specify a "desired" | |
| 32 * audio format. The "actual" format will always match what you specify, so | |
| 33 * there will be no conversion overhead, but these routines need to know how | |
| 34 * to treat the bits, since it's all random garbage otherwise. | |
| 35 * | |
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36 * Please see the file COPYING in the source's root directory. |
| 4 | 37 * |
| 38 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 39 */ | |
| 40 | |
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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 |
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45 #ifdef SOUND_SUPPORTS_RAW |
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46 |
| 4 | 47 #include <stdio.h> |
| 48 #include <stdlib.h> | |
| 49 #include <string.h> | |
| 50 #include <assert.h> | |
| 51 | |
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52 #include "SDL_sound.h" |
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53 |
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54 #define __SDL_SOUND_INTERNAL__ |
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55 #include "SDL_sound_internal.h" |
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56 |
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57 static int RAW_init(void); |
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58 static void RAW_quit(void); |
| 4 | 59 static int RAW_open(Sound_Sample *sample, const char *ext); |
| 60 static void RAW_close(Sound_Sample *sample); | |
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61 static Uint32 RAW_read(Sound_Sample *sample); |
| 4 | 62 |
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63 static const char *extensions_raw[] = { "RAW", NULL }; |
| 4 | 64 const Sound_DecoderFunctions __Sound_DecoderFunctions_RAW = |
| 65 { | |
| 66 { | |
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67 extensions_raw, |
| 4 | 68 "Raw audio", |
| 69 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 70 "http://www.icculus.org/SDL_sound/" | |
| 71 }, | |
| 72 | |
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73 RAW_init, /* init() method */ |
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74 RAW_quit, /* quit() method */ |
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75 RAW_open, /* open() method */ |
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76 RAW_close, /* close() method */ |
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77 RAW_read /* read() method */ |
| 4 | 78 }; |
| 79 | |
| 80 | |
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81 static int RAW_init(void) |
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82 { |
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83 return(1); /* always succeeds. */ |
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84 } /* RAW_init */ |
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85 |
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86 |
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87 static void RAW_quit(void) |
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88 { |
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89 /* it's a no-op. */ |
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90 } /* RAW_quit */ |
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91 |
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92 |
| 4 | 93 static int RAW_open(Sound_Sample *sample, const char *ext) |
| 94 { | |
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95 /* |
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96 * We check this explicitly, since we have no other way to |
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97 * determine whether we should handle this data or not. |
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98 */ |
| 4 | 99 if (__Sound_strcasecmp(ext, "RAW") != 0) |
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100 { |
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101 Sound_SetError("RAW: extension isn't explicitly \"RAW\"."); |
| 4 | 102 return(0); |
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103 } /* if */ |
| 4 | 104 |
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105 /* |
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106 * You must also specify a desired format, so we know how to |
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107 * treat the bits that are otherwise binary garbage. |
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108 */ |
| 4 | 109 if ( (sample->desired.channels < 1) || |
| 110 (sample->desired.channels > 2) || | |
| 111 (sample->desired.rate == 0) || | |
| 112 (sample->desired.format == 0) ) | |
| 113 { | |
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114 Sound_SetError("RAW: invalid desired format."); |
| 4 | 115 return(0); |
| 116 } /* if */ | |
| 117 | |
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118 SNDDBG(("RAW: Accepting data stream.\n")); |
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119 |
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120 /* |
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121 * We never convert raw samples; what you ask for is what you get. |
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122 */ |
| 4 | 123 memcpy(&sample->actual, &sample->desired, sizeof (Sound_AudioInfo)); |
| 124 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
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125 |
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126 return(1); /* we'll handle this data. */ |
| 4 | 127 } /* RAW_open */ |
| 128 | |
| 129 | |
| 130 static void RAW_close(Sound_Sample *sample) | |
| 131 { | |
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132 /* we don't allocate anything that we need to free. That's easy, eh? */ |
| 4 | 133 } /* RAW_close */ |
| 134 | |
| 135 | |
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136 static Uint32 RAW_read(Sound_Sample *sample) |
| 4 | 137 { |
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138 Uint32 retval; |
| 4 | 139 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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140 |
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141 /* |
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142 * We don't actually do any decoding, so we read the raw data |
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143 * directly into the internal buffer... |
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144 */ |
| 4 | 145 retval = SDL_RWread(internal->rw, internal->buffer, |
| 146 1, internal->buffer_size); | |
| 147 | |
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148 /* Make sure the read went smoothly... */ |
| 4 | 149 if (retval == 0) |
| 150 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 151 | |
| 152 else if (retval == -1) | |
| 153 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 154 | |
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155 /* (next call this EAGAIN may turn into an EOF or error.) */ |
| 4 | 156 else if (retval < internal->buffer_size) |
| 157 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 158 | |
| 159 return(retval); | |
| 160 } /* RAW_read */ | |
| 161 | |
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162 #endif /* SOUND_SUPPORTS_RAW */ |
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163 |
| 4 | 164 |
| 165 /* end of raw.c ... */ | |
| 166 |