Mercurial > SDL_sound_CoreAudio
annotate decoders/wav.c @ 278:dfe4a46f88f7
Updated.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Thu, 14 Mar 2002 16:38:32 +0000 |
parents | 170b1400e060 |
children | c97be6e1bd27 |
rev | line source |
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17 | 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 * WAV decoder for SDL_sound. | |
22 * | |
23 * This driver handles Microsoft .WAVs, in as many of the thousands of | |
24 * variations as we can. | |
25 * | |
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26 * Please see the file COPYING in the source's root directory. |
17 | 27 * |
28 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
29 */ | |
30 | |
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31 #if HAVE_CONFIG_H |
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32 # include <config.h> |
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33 #endif |
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34 |
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35 #ifdef SOUND_SUPPORTS_WAV |
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36 |
17 | 37 #include <stdio.h> |
38 #include <stdlib.h> | |
39 #include <string.h> | |
40 #include <assert.h> | |
41 | |
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42 #include "SDL_sound.h" |
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43 |
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44 #define __SDL_SOUND_INTERNAL__ |
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45 #include "SDL_sound_internal.h" |
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46 |
47
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47 static int WAV_init(void); |
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48 static void WAV_quit(void); |
17 | 49 static int WAV_open(Sound_Sample *sample, const char *ext); |
50 static void WAV_close(Sound_Sample *sample); | |
51 static Uint32 WAV_read(Sound_Sample *sample); | |
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52 static int WAV_rewind(Sound_Sample *sample); |
17 | 53 |
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54 static const char *extensions_wav[] = { "WAV", NULL }; |
17 | 55 const Sound_DecoderFunctions __Sound_DecoderFunctions_WAV = |
56 { | |
57 { | |
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58 extensions_wav, |
17 | 59 "Microsoft WAVE audio format", |
60 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
61 "http://www.icculus.org/SDL_sound/" | |
62 }, | |
63 | |
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64 WAV_init, /* init() method */ |
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65 WAV_quit, /* quit() method */ |
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66 WAV_open, /* open() method */ |
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67 WAV_close, /* close() method */ |
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68 WAV_read, /* read() method */ |
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69 WAV_rewind /* rewind() method */ |
17 | 70 }; |
71 | |
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72 |
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73 /* Better than SDL_ReadLE16, since you can detect i/o errors... */ |
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74 static inline int read_le16(SDL_RWops *rw, Uint16 *ui16) |
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75 { |
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76 int rc = SDL_RWread(rw, ui16, sizeof (Uint16), 1); |
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77 BAIL_IF_MACRO(rc != 1, ERR_IO_ERROR, 0); |
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78 *ui16 = SDL_SwapLE16(*ui16); |
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79 return(1); |
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80 } /* read_le16 */ |
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81 |
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82 |
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83 /* Better than SDL_ReadLE32, since you can detect i/o errors... */ |
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84 static inline int read_le32(SDL_RWops *rw, Uint32 *ui32) |
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85 { |
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86 int rc = SDL_RWread(rw, ui32, sizeof (Uint32), 1); |
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87 BAIL_IF_MACRO(rc != 1, ERR_IO_ERROR, 0); |
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88 *ui32 = SDL_SwapLE32(*ui32); |
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89 return(1); |
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90 } /* read_le32 */ |
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91 |
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92 |
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93 /* This is just cleaner on the caller's end... */ |
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94 static inline int read_uint8(SDL_RWops *rw, Uint8 *ui8) |
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95 { |
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96 int rc = SDL_RWread(rw, ui8, sizeof (Uint8), 1); |
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97 BAIL_IF_MACRO(rc != 1, ERR_IO_ERROR, 0); |
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98 return(1); |
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99 } /* read_uint8 */ |
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100 |
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101 |
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102 /* Chunk management code... */ |
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103 |
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104 #define riffID 0x46464952 /* "RIFF", in ascii. */ |
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105 #define waveID 0x45564157 /* "WAVE", in ascii. */ |
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106 #define factID 0x74636166 /* "fact", in ascii. */ |
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107 |
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108 |
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109 /***************************************************************************** |
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110 * The FORMAT chunk... * |
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111 *****************************************************************************/ |
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112 |
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113 #define fmtID 0x20746D66 /* "fmt ", in ascii. */ |
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114 |
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115 #define FMT_NORMAL 0x0001 /* Uncompressed waveform data. */ |
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116 #define FMT_ADPCM 0x0002 /* ADPCM compressed waveform data. */ |
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117 |
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118 typedef struct |
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119 { |
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120 Sint16 iCoef1; |
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121 Sint16 iCoef2; |
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122 } ADPCMCOEFSET; |
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123 |
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124 typedef struct |
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125 { |
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126 Uint8 bPredictor; |
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127 Uint16 iDelta; |
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128 Sint16 iSamp1; |
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129 Sint16 iSamp2; |
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130 } ADPCMBLOCKHEADER; |
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131 |
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132 typedef struct S_WAV_FMT_T |
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133 { |
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134 Uint32 chunkID; |
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135 Sint32 chunkSize; |
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136 Sint16 wFormatTag; |
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137 Uint16 wChannels; |
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138 Uint32 dwSamplesPerSec; |
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139 Uint32 dwAvgBytesPerSec; |
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140 Uint16 wBlockAlign; |
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141 Uint16 wBitsPerSample; |
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142 |
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143 Uint32 sample_frame_size; |
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144 Uint32 data_starting_offset; |
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145 Uint32 total_bytes; |
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146 |
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147 void (*free)(struct S_WAV_FMT_T *fmt); |
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148 Uint32 (*read_sample)(Sound_Sample *sample); |
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149 int (*rewind_sample)(Sound_Sample *sample); |
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150 |
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151 union |
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152 { |
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153 struct |
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154 { |
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155 Uint16 cbSize; |
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156 Uint16 wSamplesPerBlock; |
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157 Uint16 wNumCoef; |
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158 ADPCMCOEFSET *aCoef; |
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159 ADPCMBLOCKHEADER *blockheaders; |
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160 Uint32 samples_left_in_block; |
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161 int nibble_state; |
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162 Sint8 nibble; |
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163 } adpcm; |
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164 |
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165 /* put other format-specific data here... */ |
124
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166 } fmt; |
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167 } fmt_t; |
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168 |
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169 |
17 | 170 /* |
171 * Read in a fmt_t from disk. This makes this process safe regardless of | |
172 * the processor's byte order or how the fmt_t structure is packed. | |
124
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173 * Note that the union "fmt" is not read in here; that is handled as |
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174 * needed in the read_fmt_* functions. |
17 | 175 */ |
176 static int read_fmt_chunk(SDL_RWops *rw, fmt_t *fmt) | |
177 { | |
178 /* skip reading the chunk ID, since it was already read at this point... */ | |
179 fmt->chunkID = fmtID; | |
180 | |
183
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181 BAIL_IF_MACRO(!read_le32(rw, &fmt->chunkSize), NULL, 0); |
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182 BAIL_IF_MACRO(!read_le16(rw, &fmt->wFormatTag), NULL, 0); |
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183 BAIL_IF_MACRO(!read_le16(rw, &fmt->wChannels), NULL, 0); |
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184 BAIL_IF_MACRO(!read_le32(rw, &fmt->dwSamplesPerSec), NULL, 0); |
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185 BAIL_IF_MACRO(!read_le32(rw, &fmt->dwAvgBytesPerSec), NULL, 0); |
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186 BAIL_IF_MACRO(!read_le16(rw, &fmt->wBlockAlign), NULL, 0); |
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187 BAIL_IF_MACRO(!read_le16(rw, &fmt->wBitsPerSample), NULL, 0); |
17 | 188 |
189 return(1); | |
190 } /* read_fmt_chunk */ | |
191 | |
192 | |
124
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193 |
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194 /***************************************************************************** |
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195 * The DATA chunk... * |
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196 *****************************************************************************/ |
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197 |
17 | 198 #define dataID 0x61746164 /* "data", in ascii. */ |
199 | |
200 typedef struct | |
201 { | |
202 Uint32 chunkID; | |
203 Sint32 chunkSize; | |
204 /* Then, (chunkSize) bytes of waveform data... */ | |
205 } data_t; | |
206 | |
207 | |
208 /* | |
124
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209 * Read in a data_t from disk. This makes this process safe regardless of |
17 | 210 * the processor's byte order or how the fmt_t structure is packed. |
211 */ | |
212 static int read_data_chunk(SDL_RWops *rw, data_t *data) | |
213 { | |
214 /* skip reading the chunk ID, since it was already read at this point... */ | |
215 data->chunkID = dataID; | |
183
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216 BAIL_IF_MACRO(!read_le32(rw, &data->chunkSize), NULL, 0); |
17 | 217 return(1); |
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218 } /* read_data_chunk */ |
17 | 219 |
220 | |
221 | |
222 | |
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223 /***************************************************************************** |
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224 * this is what we store in our internal->decoder_private field... * |
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225 *****************************************************************************/ |
17 | 226 |
124
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227 typedef struct |
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228 { |
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229 fmt_t *fmt; |
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230 Sint32 bytesLeft; |
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231 } wav_t; |
17 | 232 |
233 | |
234 | |
235 | |
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236 /***************************************************************************** |
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237 * Normal, uncompressed waveform handler... * |
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238 *****************************************************************************/ |
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239 |
185
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240 /* |
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241 * Sound_Decode() lands here for uncompressed WAVs... |
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242 */ |
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243 static Uint32 read_sample_fmt_normal(Sound_Sample *sample) |
17 | 244 { |
245 Uint32 retval; | |
246 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
247 wav_t *w = (wav_t *) internal->decoder_private; | |
248 Uint32 max = (internal->buffer_size < (Uint32) w->bytesLeft) ? | |
249 internal->buffer_size : (Uint32) w->bytesLeft; | |
250 | |
251 assert(max > 0); | |
252 | |
253 /* | |
254 * We don't actually do any decoding, so we read the wav data | |
255 * directly into the internal buffer... | |
256 */ | |
257 retval = SDL_RWread(internal->rw, internal->buffer, 1, max); | |
258 | |
259 w->bytesLeft -= retval; | |
260 | |
261 /* Make sure the read went smoothly... */ | |
262 if ((retval == 0) || (w->bytesLeft == 0)) | |
263 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
264 | |
265 else if (retval == -1) | |
266 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
267 | |
268 /* (next call this EAGAIN may turn into an EOF or error.) */ | |
269 else if (retval < internal->buffer_size) | |
270 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
271 | |
272 return(retval); | |
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273 } /* read_sample_fmt_normal */ |
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274 |
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275 |
221
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276 static int rewind_sample_fmt_normal(Sound_Sample *sample) |
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277 { |
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278 /* no-op. */ |
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279 return(1); |
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280 } /* rewind_sample_fmt_normal */ |
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281 |
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282 |
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283 static int read_fmt_normal(SDL_RWops *rw, fmt_t *fmt) |
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284 { |
178
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285 /* (don't need to read more from the RWops...) */ |
183
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286 fmt->free = NULL; |
124
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287 fmt->read_sample = read_sample_fmt_normal; |
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288 fmt->rewind_sample = rewind_sample_fmt_normal; |
124
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289 return(1); |
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290 } /* read_fmt_normal */ |
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291 |
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292 |
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293 |
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294 /***************************************************************************** |
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295 * ADPCM compression handler... * |
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296 *****************************************************************************/ |
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297 |
185
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298 #define FIXED_POINT_COEF_BASE 256 |
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299 #define FIXED_POINT_ADAPTION_BASE 256 |
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300 #define SMALLEST_ADPCM_DELTA 16 |
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301 |
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302 |
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303 static inline int read_adpcm_block_headers(Sound_Sample *sample) |
183
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304 { |
185
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305 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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306 SDL_RWops *rw = internal->rw; |
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307 wav_t *w = (wav_t *) internal->decoder_private; |
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308 fmt_t *fmt = w->fmt; |
183
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309 ADPCMBLOCKHEADER *headers = fmt->fmt.adpcm.blockheaders; |
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310 int i; |
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311 int max = fmt->wChannels; |
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312 |
185
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313 if (w->bytesLeft < fmt->wBlockAlign) |
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314 { |
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315 sample->flags |= SOUND_SAMPLEFLAG_EOF; |
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316 return(0); |
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317 } /* if */ |
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318 |
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319 w->bytesLeft -= fmt->wBlockAlign; |
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320 |
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321 for (i = 0; i < max; i++) |
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322 BAIL_IF_MACRO(!read_uint8(rw, &headers[i].bPredictor), NULL, 0); |
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323 |
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324 for (i = 0; i < max; i++) |
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325 BAIL_IF_MACRO(!read_le16(rw, &headers[i].iDelta), NULL, 0); |
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326 |
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327 for (i = 0; i < max; i++) |
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328 BAIL_IF_MACRO(!read_le16(rw, &headers[i].iSamp1), NULL, 0); |
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329 |
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330 for (i = 0; i < max; i++) |
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331 BAIL_IF_MACRO(!read_le16(rw, &headers[i].iSamp2), NULL, 0); |
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332 |
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333 fmt->fmt.adpcm.samples_left_in_block = fmt->fmt.adpcm.wSamplesPerBlock; |
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334 fmt->fmt.adpcm.nibble_state = 0; |
183
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335 return(1); |
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336 } /* read_adpcm_block_headers */ |
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337 |
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338 |
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339 static inline void do_adpcm_nibble(Uint8 nib, |
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340 ADPCMBLOCKHEADER *header, |
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341 Sint32 lPredSamp) |
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342 { |
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343 static const Sint32 max_audioval = ((1<<(16-1))-1); |
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344 static const Sint32 min_audioval = -(1<<(16-1)); |
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345 static const Sint32 AdaptionTable[] = |
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346 { |
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347 230, 230, 230, 230, 307, 409, 512, 614, |
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348 768, 614, 512, 409, 307, 230, 230, 230 |
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349 }; |
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350 |
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351 Sint32 lNewSamp; |
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352 Sint32 delta; |
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353 |
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354 if (nib & 0x08) |
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355 lNewSamp = lPredSamp + (header->iDelta * (nib - 0x10)); |
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356 else |
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357 lNewSamp = lPredSamp + (header->iDelta * nib); |
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358 |
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359 /* clamp value... */ |
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360 if (lNewSamp < min_audioval) |
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361 lNewSamp = min_audioval; |
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362 else if (lNewSamp > max_audioval) |
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363 lNewSamp = max_audioval; |
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364 |
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365 delta = ((Sint32) header->iDelta * AdaptionTable[nib]) / |
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366 FIXED_POINT_ADAPTION_BASE; |
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367 |
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368 if (delta < SMALLEST_ADPCM_DELTA) |
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369 delta = SMALLEST_ADPCM_DELTA; |
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370 |
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371 header->iDelta = delta; |
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372 header->iSamp2 = header->iSamp1; |
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373 header->iSamp1 = lNewSamp; |
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374 } /* do_adpcm_nibble */ |
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375 |
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376 |
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377 static inline int decode_adpcm_sample_frame(Sound_Sample *sample) |
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378 { |
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379 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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380 wav_t *w = (wav_t *) internal->decoder_private; |
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381 fmt_t *fmt = w->fmt; |
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382 ADPCMBLOCKHEADER *headers = fmt->fmt.adpcm.blockheaders; |
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383 SDL_RWops *rw = internal->rw; |
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384 int i; |
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385 int max = fmt->wChannels; |
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386 Sint32 delta; |
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387 Uint8 nib = fmt->fmt.adpcm.nibble; |
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388 |
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389 for (i = 0; i < max; i++) |
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390 { |
185
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391 Uint8 byte; |
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392 Sint16 iCoef1 = fmt->fmt.adpcm.aCoef[headers[i].bPredictor].iCoef1; |
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393 Sint16 iCoef2 = fmt->fmt.adpcm.aCoef[headers[i].bPredictor].iCoef2; |
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394 Sint32 lPredSamp = ((headers[i].iSamp1 * iCoef1) + |
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395 (headers[i].iSamp2 * iCoef2)) / |
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396 FIXED_POINT_COEF_BASE; |
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397 |
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398 if (fmt->fmt.adpcm.nibble_state == 0) |
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399 { |
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400 BAIL_IF_MACRO(!read_uint8(rw, &nib), NULL, 0); |
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401 fmt->fmt.adpcm.nibble_state = 1; |
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402 do_adpcm_nibble(nib >> 4, &headers[i], lPredSamp); |
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403 } /* if */ |
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404 else |
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405 { |
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406 fmt->fmt.adpcm.nibble_state = 0; |
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407 do_adpcm_nibble(nib & 0x0F, &headers[i], lPredSamp); |
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408 } /* else */ |
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409 } /* for */ |
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410 |
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411 fmt->fmt.adpcm.nibble = nib; |
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412 return(1); |
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413 } /* decode_adpcm_sample_frame */ |
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414 |
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415 |
242
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416 static inline void put_adpcm_sample_frame1(void *_buf, fmt_t *fmt) |
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417 { |
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418 Uint16 *buf = (Uint16 *) _buf; |
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419 ADPCMBLOCKHEADER *headers = fmt->fmt.adpcm.blockheaders; |
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420 int i; |
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421 for (i = 0; i < fmt->wChannels; i++) |
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422 *(buf++) = headers[i].iSamp1; |
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423 } /* put_adpcm_sample_frame1 */ |
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424 |
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425 |
242
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426 static inline void put_adpcm_sample_frame2(void *_buf, fmt_t *fmt) |
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427 { |
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428 Uint16 *buf = (Uint16 *) _buf; |
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429 ADPCMBLOCKHEADER *headers = fmt->fmt.adpcm.blockheaders; |
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430 int i; |
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431 for (i = 0; i < fmt->wChannels; i++) |
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432 *(buf++) = headers[i].iSamp2; |
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433 } /* put_adpcm_sample_frame2 */ |
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434 |
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435 |
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436 /* |
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437 * Sound_Decode() lands here for ADPCM-encoded WAVs... |
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438 */ |
124
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439 static Uint32 read_sample_fmt_adpcm(Sound_Sample *sample) |
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440 { |
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441 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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442 wav_t *w = (wav_t *) internal->decoder_private; |
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443 fmt_t *fmt = w->fmt; |
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444 Uint32 bw = 0; |
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445 |
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446 while (bw < internal->buffer_size) |
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447 { |
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448 /* write ongoing sample frame before reading more data... */ |
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449 switch (fmt->fmt.adpcm.samples_left_in_block) |
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450 { |
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451 case 0: /* need to read a new block... */ |
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452 if (!read_adpcm_block_headers(sample)) |
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453 { |
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454 if ((sample->flags & SOUND_SAMPLEFLAG_EOF) == 0) |
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455 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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456 return(bw); |
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|
457 } /* if */ |
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458 |
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459 /* only write first sample frame for now. */ |
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460 put_adpcm_sample_frame2((Uint8 *) internal->buffer + bw, fmt); |
185
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461 fmt->fmt.adpcm.samples_left_in_block--; |
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462 bw += fmt->sample_frame_size; |
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463 break; |
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464 |
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465 case 1: /* output last sample frame of block... */ |
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466 put_adpcm_sample_frame1((Uint8 *) internal->buffer + bw, fmt); |
185
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467 fmt->fmt.adpcm.samples_left_in_block--; |
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468 bw += fmt->sample_frame_size; |
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469 break; |
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470 |
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471 default: /* output latest sample frame and read a new one... */ |
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472 put_adpcm_sample_frame1((Uint8 *) internal->buffer + bw, fmt); |
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473 fmt->fmt.adpcm.samples_left_in_block--; |
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474 bw += fmt->sample_frame_size; |
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475 |
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476 if (!decode_adpcm_sample_frame(sample)) |
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477 { |
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478 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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479 return(bw); |
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480 } /* if */ |
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481 } /* switch */ |
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482 } /* while */ |
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483 |
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484 return(bw); |
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485 } /* read_sample_fmt_adpcm */ |
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486 |
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487 |
185
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488 /* |
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489 * Sound_FreeSample() lands here for ADPCM-encoded WAVs... |
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490 */ |
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491 static void free_fmt_adpcm(fmt_t *fmt) |
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492 { |
183
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493 if (fmt->fmt.adpcm.aCoef != NULL) |
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494 free(fmt->fmt.adpcm.aCoef); |
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495 |
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496 if (fmt->fmt.adpcm.blockheaders != NULL) |
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497 free(fmt->fmt.adpcm.blockheaders); |
124
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498 } /* free_fmt_adpcm */ |
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499 |
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500 |
221
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501 static int rewind_sample_fmt_adpcm(Sound_Sample *sample) |
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502 { |
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503 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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504 wav_t *w = (wav_t *) internal->decoder_private; |
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505 w->fmt->fmt.adpcm.samples_left_in_block = 0; |
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506 return(1); |
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507 } /* rewind_sample_fmt_adpcm */ |
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508 |
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509 |
124
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510 /* |
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511 * Read in a the adpcm-specific info from disk. This makes this process |
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512 * safe regardless of the processor's byte order or how the fmt_t |
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513 * structure is packed. |
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514 */ |
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515 static int read_fmt_adpcm(SDL_RWops *rw, fmt_t *fmt) |
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516 { |
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517 size_t i; |
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518 |
183
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519 memset(&fmt->fmt.adpcm, '\0', sizeof (fmt->fmt.adpcm)); |
124
e46e31fdecfd
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520 fmt->free = free_fmt_adpcm; |
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521 fmt->read_sample = read_sample_fmt_adpcm; |
221
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522 fmt->rewind_sample = rewind_sample_fmt_adpcm; |
124
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523 |
183
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524 BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.cbSize), NULL, 0); |
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|
525 BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.wSamplesPerBlock), NULL, 0); |
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526 BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.wNumCoef), NULL, 0); |
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|
527 |
185
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528 /* fmt->free() is always called, so these malloc()s will be cleaned up. */ |
124
e46e31fdecfd
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|
529 |
183
26996236d790
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|
530 i = sizeof (ADPCMCOEFSET) * fmt->fmt.adpcm.wNumCoef; |
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|
531 fmt->fmt.adpcm.aCoef = (ADPCMCOEFSET *) malloc(i); |
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532 BAIL_IF_MACRO(fmt->fmt.adpcm.aCoef == NULL, ERR_OUT_OF_MEMORY, 0); |
124
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diff
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|
533 |
185
6bb68b3bdcf1
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534 for (i = 0; i < fmt->fmt.adpcm.wNumCoef; i++) |
6bb68b3bdcf1
ADPCM decoder seems to be complete, other fixes too...
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|
535 { |
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ADPCM decoder seems to be complete, other fixes too...
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|
536 BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.aCoef[i].iCoef1), NULL, 0); |
6bb68b3bdcf1
ADPCM decoder seems to be complete, other fixes too...
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|
537 BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.aCoef[i].iCoef2), NULL, 0); |
6bb68b3bdcf1
ADPCM decoder seems to be complete, other fixes too...
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diff
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|
538 } /* for */ |
6bb68b3bdcf1
ADPCM decoder seems to be complete, other fixes too...
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183
diff
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|
539 |
183
26996236d790
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178
diff
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|
540 i = sizeof (ADPCMBLOCKHEADER) * fmt->wChannels; |
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diff
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|
541 fmt->fmt.adpcm.blockheaders = (ADPCMBLOCKHEADER *) malloc(i); |
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Updated comments to reflect change from LICENSE to COPYING file, and put a
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|
542 BAIL_IF_MACRO(fmt->fmt.adpcm.blockheaders == NULL, ERR_OUT_OF_MEMORY, 0); |
124
e46e31fdecfd
Restructured to handle multiple formats.
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diff
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|
543 |
e46e31fdecfd
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106
diff
changeset
|
544 return(1); |
e46e31fdecfd
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106
diff
changeset
|
545 } /* read_fmt_adpcm */ |
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diff
changeset
|
546 |
e46e31fdecfd
Restructured to handle multiple formats.
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106
diff
changeset
|
547 |
178
bdbe09014724
Minor tweaks and such.
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149
diff
changeset
|
548 |
124
e46e31fdecfd
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106
diff
changeset
|
549 /***************************************************************************** |
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diff
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|
550 * Everything else... * |
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106
diff
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|
551 *****************************************************************************/ |
e46e31fdecfd
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|
552 |
178
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diff
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|
553 static int WAV_init(void) |
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149
diff
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|
554 { |
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diff
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|
555 return(1); /* always succeeds. */ |
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diff
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|
556 } /* WAV_init */ |
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Minor tweaks and such.
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149
diff
changeset
|
557 |
bdbe09014724
Minor tweaks and such.
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149
diff
changeset
|
558 |
bdbe09014724
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diff
changeset
|
559 static void WAV_quit(void) |
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diff
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|
560 { |
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diff
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|
561 /* it's a no-op. */ |
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diff
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|
562 } /* WAV_quit */ |
bdbe09014724
Minor tweaks and such.
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diff
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|
563 |
124
e46e31fdecfd
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diff
changeset
|
564 |
e46e31fdecfd
Restructured to handle multiple formats.
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diff
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|
565 static int read_fmt(SDL_RWops *rw, fmt_t *fmt) |
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diff
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|
566 { |
e46e31fdecfd
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106
diff
changeset
|
567 /* if it's in this switch statement, we support the format. */ |
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106
diff
changeset
|
568 switch (fmt->wFormatTag) |
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106
diff
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|
569 { |
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106
diff
changeset
|
570 case FMT_NORMAL: |
178
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Minor tweaks and such.
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149
diff
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|
571 SNDDBG(("WAV: Appears to be uncompressed audio.\n")); |
124
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572 return(read_fmt_normal(rw, fmt)); |
e46e31fdecfd
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|
573 |
e46e31fdecfd
Restructured to handle multiple formats.
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diff
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|
574 case FMT_ADPCM: |
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575 SNDDBG(("WAV: Appears to be ADPCM compressed audio.\n")); |
124
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576 return(read_fmt_adpcm(rw, fmt)); |
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577 |
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578 /* add other types here. */ |
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579 |
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580 default: |
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581 SNDDBG(("WAV: Format 0x%X is unknown.\n", |
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582 (unsigned int) fmt->wFormatTag)); |
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583 Sound_SetError("WAV: Unsupported format"); |
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584 return(0); /* not supported whatsoever. */ |
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585 } /* switch */ |
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586 |
178
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587 assert(0); /* shouldn't hit this point. */ |
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588 return(0); |
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589 } /* read_fmt */ |
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590 |
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591 |
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592 /* |
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593 * Locate a specific chunk in the WAVE file by ID... |
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594 */ |
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595 static int find_chunk(SDL_RWops *rw, Uint32 id) |
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596 { |
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597 Sint32 siz = 0; |
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598 Uint32 _id = 0; |
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599 Uint32 pos = SDL_RWtell(rw); |
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600 |
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601 while (1) |
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602 { |
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603 BAIL_IF_MACRO(!read_le32(rw, &_id), NULL, 0); |
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604 if (_id == id) |
124
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605 return(1); |
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606 |
183
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607 /* skip ahead and see what next chunk is... */ |
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608 BAIL_IF_MACRO(!read_le32(rw, &siz), NULL, 0); |
185
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609 assert(siz >= 0); |
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610 pos += (sizeof (Uint32) * 2) + siz; |
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611 if (siz > 0) |
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612 BAIL_IF_MACRO(SDL_RWseek(rw, pos, SEEK_SET) != pos, NULL, 0); |
124
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613 } /* while */ |
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|
614 |
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615 return(0); /* shouldn't hit this, but just in case... */ |
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616 } /* find_chunk */ |
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|
617 |
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|
618 |
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619 static int WAV_open_internal(Sound_Sample *sample, const char *ext, fmt_t *fmt) |
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620 { |
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621 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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622 SDL_RWops *rw = internal->rw; |
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623 data_t d; |
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624 wav_t *w; |
185
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625 Uint32 pos; |
124
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626 |
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627 BAIL_IF_MACRO(SDL_ReadLE32(rw) != riffID, "WAV: Not a RIFF file.", 0); |
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628 SDL_ReadLE32(rw); /* throw the length away; we get this info later. */ |
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629 BAIL_IF_MACRO(SDL_ReadLE32(rw) != waveID, "WAV: Not a WAVE file.", 0); |
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630 BAIL_IF_MACRO(!find_chunk(rw, fmtID), "WAV: No format chunk.", 0); |
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631 BAIL_IF_MACRO(!read_fmt_chunk(rw, fmt), "WAV: Can't read format chunk.", 0); |
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632 |
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633 sample->actual.channels = (Uint8) fmt->wChannels; |
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634 sample->actual.rate = fmt->dwSamplesPerSec; |
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635 if ((fmt->wBitsPerSample == 4) /*|| (fmt->wBitsPerSample == 0) */ ) |
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636 sample->actual.format = AUDIO_S16SYS; /* !!! FIXME ? */ |
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637 else if (fmt->wBitsPerSample == 8) |
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638 sample->actual.format = AUDIO_U8; |
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639 else if (fmt->wBitsPerSample == 16) |
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640 sample->actual.format = AUDIO_S16LSB; |
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641 else |
193
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|
642 { |
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643 SNDDBG(("WAV: %d bits per sample!?\n", (int) fmt->wBitsPerSample)); |
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644 BAIL_MACRO("WAV: Unsupported sample size.", 0); |
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645 } /* else */ |
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646 |
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647 BAIL_IF_MACRO(!read_fmt(rw, fmt), NULL, 0); |
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648 BAIL_IF_MACRO(!find_chunk(rw, dataID), "WAV: No data chunk.", 0); |
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649 BAIL_IF_MACRO(!read_data_chunk(rw, &d), "WAV: Can't read data chunk.", 0); |
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650 |
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651 w = (wav_t *) malloc(sizeof(wav_t)); |
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652 BAIL_IF_MACRO(w == NULL, ERR_OUT_OF_MEMORY, 0); |
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653 w->fmt = fmt; |
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654 fmt->total_bytes = w->bytesLeft = d.chunkSize; |
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655 fmt->data_starting_offset = SDL_RWtell(rw); |
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656 |
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657 /* !!! FIXME: Move this to Sound_SampleInfo ? */ |
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658 fmt->sample_frame_size = ( ((sample->actual.format & 0xFF) / 8) * |
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659 sample->actual.channels ); |
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660 |
124
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661 internal->decoder_private = (void *) w; |
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662 |
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663 sample->flags = SOUND_SAMPLEFLAG_NONE; |
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664 |
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665 SNDDBG(("WAV: Accepting data stream.\n")); |
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666 return(1); /* we'll handle this data. */ |
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667 } /* WAV_open_internal */ |
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668 |
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|
669 |
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670 static int WAV_open(Sound_Sample *sample, const char *ext) |
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671 { |
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|
672 int rc; |
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673 |
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674 fmt_t *fmt = (fmt_t *) malloc(sizeof (fmt_t)); |
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675 BAIL_IF_MACRO(fmt == NULL, ERR_OUT_OF_MEMORY, 0); |
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676 memset(fmt, '\0', sizeof (fmt_t)); |
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677 |
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678 rc = WAV_open_internal(sample, ext, fmt); |
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679 if (!rc) |
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|
680 { |
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|
681 if (fmt->free != NULL) |
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682 fmt->free(fmt); |
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|
683 free(fmt); |
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|
684 } /* if */ |
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|
685 |
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686 return(rc); |
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|
687 } /* WAV_open */ |
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|
688 |
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|
689 |
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690 static void WAV_close(Sound_Sample *sample) |
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691 { |
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692 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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693 wav_t *w = (wav_t *) internal->decoder_private; |
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694 |
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695 if (w->fmt->free != NULL) |
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696 w->fmt->free(w->fmt); |
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697 |
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698 free(w->fmt); |
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699 free(w); |
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700 } /* WAV_close */ |
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701 |
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702 |
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703 static Uint32 WAV_read(Sound_Sample *sample) |
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704 { |
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705 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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706 wav_t *w = (wav_t *) internal->decoder_private; |
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707 return(w->fmt->read_sample(sample)); |
17 | 708 } /* WAV_read */ |
709 | |
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710 |
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711 static int WAV_rewind(Sound_Sample *sample) |
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712 { |
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713 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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714 wav_t *w = (wav_t *) internal->decoder_private; |
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715 fmt_t *fmt = w->fmt; |
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716 int rc = SDL_RWseek(internal->rw, fmt->data_starting_offset, SEEK_SET); |
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717 BAIL_IF_MACRO(rc != fmt->data_starting_offset, ERR_IO_ERROR, 0); |
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718 w->bytesLeft = fmt->total_bytes; |
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719 return(fmt->rewind_sample(sample)); |
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720 } /* WAV_rewind */ |
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721 |
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722 #endif /* SOUND_SUPPORTS_WAV */ |
17 | 723 |
724 /* end of wav.c ... */ | |
725 |