Mercurial > SDL_sound_CoreAudio
annotate decoders/voc.c @ 591:8faf61a640f0 tip
Resynced fixes for unit conversion bugs in the Ogg Tremor decoder from SoundDecoder/ALmixer.
Ogg Vorbis uses seconds and we multiply by 1000 to convert to milliseconds. But Ogg Tremor already uses milliseconds but I was still multiplying by 1000.
| author | Eric Wing <ewing . public |-at-| gmail . com> |
|---|---|
| date | Thu, 25 Oct 2012 16:34:18 -0700 |
| parents | 2e8907ff98e9 |
| children |
| rev | line source |
|---|---|
| 14 | 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 * VOC decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles Creative Labs VOC audio data...this is a legacy format, | |
| 24 * but there's some game ports that could make use of such a decoder. Plus, | |
| 25 * VOC is fairly straightforward to decode, so this is a more complex, but | |
| 26 * still palatable example of an SDL_sound decoder. Y'know, in case the | |
| 27 * RAW decoder didn't do it for you. :) | |
| 28 * | |
| 29 * This code was ripped from a decoder I had written for SDL_mixer, which was | |
| 30 * largely ripped from sox v12.17.1's voc.c. | |
| 31 * | |
| 32 * SDL_mixer: http://www.libsdl.org/projects/SDL_mixer/ | |
| 33 * sox: http://www.freshmeat.net/projects/sox/ | |
| 34 * | |
|
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35 * Please see the file LICENSE.txt in the source's root directory. |
| 14 | 36 * |
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37 * This file written by Ryan C. Gordon. (icculus@icculus.org) |
| 14 | 38 */ |
| 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_VOC |
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45 |
| 14 | 46 #include <stdio.h> |
| 47 #include <stdlib.h> | |
| 48 #include <string.h> | |
| 49 | |
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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 |
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55 static int VOC_init(void); |
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56 static void VOC_quit(void); |
| 14 | 57 static int VOC_open(Sound_Sample *sample, const char *ext); |
| 58 static void VOC_close(Sound_Sample *sample); | |
| 59 static Uint32 VOC_read(Sound_Sample *sample); | |
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60 static int VOC_rewind(Sound_Sample *sample); |
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61 static int VOC_seek(Sound_Sample *sample, Uint32 ms); |
| 14 | 62 |
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63 static const char *extensions_voc[] = { "VOC", NULL }; |
| 14 | 64 const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC = |
| 65 { | |
| 66 { | |
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67 extensions_voc, |
| 14 | 68 "Creative Labs Voice format", |
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69 "Ryan C. Gordon <icculus@icculus.org>", |
| 14 | 70 "http://www.icculus.org/SDL_sound/" |
| 71 }, | |
| 72 | |
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73 VOC_init, /* init() method */ |
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74 VOC_quit, /* quit() method */ |
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75 VOC_open, /* open() method */ |
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76 VOC_close, /* close() method */ |
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77 VOC_read, /* read() method */ |
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78 VOC_rewind, /* rewind() method */ |
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79 VOC_seek /* seek() method */ |
| 14 | 80 }; |
| 81 | |
| 82 | |
| 83 /* Private data for VOC file */ | |
| 84 typedef struct vocstuff { | |
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85 Uint32 rest; /* bytes remaining in current block */ |
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86 Uint32 rate; /* rate code (byte) of this chunk */ |
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87 int silent; /* sound or silence? */ |
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88 Uint32 srate; /* rate code (byte) of silence */ |
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89 Uint32 blockseek; /* start of current output block */ |
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90 Uint32 samples; /* number of samples output */ |
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91 Uint32 size; /* word length of data */ |
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92 Uint8 channels; /* number of sound channels */ |
| 14 | 93 int extended; /* Has an extended block been read? */ |
| 94 Uint32 bufpos; /* byte position in internal->buffer. */ | |
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95 Uint32 start_pos; /* offset to seek to in stream when rewinding. */ |
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96 int error; /* error condition (as opposed to EOF). */ |
| 14 | 97 } vs_t; |
| 98 | |
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99 |
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100 /* Size field */ |
| 14 | 101 /* SJB: note that the 1st 3 are sometimes used as sizeof(type) */ |
| 102 #define ST_SIZE_BYTE 1 | |
| 103 #define ST_SIZE_8BIT 1 | |
| 104 #define ST_SIZE_WORD 2 | |
| 105 #define ST_SIZE_16BIT 2 | |
| 106 #define ST_SIZE_DWORD 4 | |
| 107 #define ST_SIZE_32BIT 4 | |
| 108 #define ST_SIZE_FLOAT 5 | |
| 109 #define ST_SIZE_DOUBLE 6 | |
| 110 #define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */ | |
| 111 | |
| 112 /* Style field */ | |
| 113 #define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */ | |
| 114 #define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */ | |
| 115 #define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */ | |
| 116 #define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */ | |
| 117 #define ST_ENCODING_ADPCM 5 /* Compressed PCM */ | |
| 118 #define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */ | |
| 119 #define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */ | |
| 120 | |
| 121 #define VOC_TERM 0 | |
| 122 #define VOC_DATA 1 | |
| 123 #define VOC_CONT 2 | |
| 124 #define VOC_SILENCE 3 | |
| 125 #define VOC_MARKER 4 | |
| 126 #define VOC_TEXT 5 | |
| 127 #define VOC_LOOP 6 | |
| 128 #define VOC_LOOPEND 7 | |
| 129 #define VOC_EXTENDED 8 | |
| 130 #define VOC_DATA_16 9 | |
| 131 | |
| 132 | |
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133 static int VOC_init(void) |
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134 { |
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135 return(1); /* always succeeds. */ |
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136 } /* VOC_init */ |
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137 |
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138 |
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139 static void VOC_quit(void) |
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140 { |
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141 /* it's a no-op. */ |
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142 } /* VOC_quit */ |
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143 |
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144 |
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145 static __inline__ int voc_readbytes(SDL_RWops *src, vs_t *v, void *p, int size) |
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146 { |
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147 if (SDL_RWread(src, p, size, 1) != 1) |
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148 { |
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149 v->error = 1; |
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150 BAIL_MACRO("VOC: i/o error", 0); |
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151 } /* if */ |
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152 |
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153 return(1); |
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154 } /* voc_readbytes */ |
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155 |
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156 |
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157 static __inline__ int voc_check_header(SDL_RWops *src) |
| 14 | 158 { |
| 159 /* VOC magic header */ | |
| 160 Uint8 signature[20]; /* "Creative Voice File\032" */ | |
| 161 Uint16 datablockofs; | |
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162 vs_t v; /* dummy struct for voc_readbytes */ |
| 14 | 163 |
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164 if (!voc_readbytes(src, &v, signature, sizeof (signature))) |
| 14 | 165 return(0); |
| 166 | |
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167 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) |
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168 { |
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169 BAIL_MACRO("VOC: Wrong signature; not a VOC file.", 0); |
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170 } /* if */ |
| 14 | 171 |
| 172 /* get the offset where the first datablock is located */ | |
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173 if (!voc_readbytes(src, &v, &datablockofs, sizeof (Uint16))) |
| 14 | 174 return(0); |
| 175 | |
| 176 datablockofs = SDL_SwapLE16(datablockofs); | |
| 177 | |
| 178 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs) | |
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179 { |
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180 BAIL_MACRO("VOC: Failed to seek to data block.", 0); |
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181 } /* if */ |
| 14 | 182 |
| 183 return(1); /* success! */ | |
| 184 } /* voc_check_header */ | |
| 185 | |
| 186 | |
| 187 /* Read next block header, save info, leave position at start of data */ | |
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188 static int voc_get_block(Sound_Sample *sample, vs_t *v) |
| 14 | 189 { |
| 190 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 191 SDL_RWops *src = internal->rw; | |
| 192 Uint8 bits24[3]; | |
| 193 Uint8 uc, block; | |
| 194 Uint32 sblen; | |
| 195 Uint16 new_rate_short; | |
| 196 Uint32 new_rate_long; | |
| 197 Uint8 trash[6]; | |
| 198 Uint16 period; | |
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199 Uint32 bytes_per_second; |
| 14 | 200 int i; |
| 201 | |
| 202 v->silent = 0; | |
| 203 while (v->rest == 0) | |
| 204 { | |
| 205 if (SDL_RWread(src, &block, sizeof (block), 1) != 1) | |
| 206 return 1; /* assume that's the end of the file. */ | |
| 207 | |
| 208 if (block == VOC_TERM) | |
| 209 return 1; | |
| 210 | |
| 211 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1) | |
| 212 return 1; /* assume that's the end of the file. */ | |
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213 |
| 14 | 214 /* Size is an 24-bit value. Ugh. */ |
| 215 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) ); | |
| 216 | |
| 217 switch(block) | |
| 218 { | |
| 219 case VOC_DATA: | |
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220 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 221 return 0; |
| 222 | |
| 223 /* When DATA block preceeded by an EXTENDED */ | |
| 224 /* block, the DATA blocks rate value is invalid */ | |
| 225 if (!v->extended) | |
| 226 { | |
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227 BAIL_IF_MACRO(uc == 0, "VOC: Sample rate is zero?", 0); |
| 14 | 228 |
| 229 if ((v->rate != -1) && (uc != v->rate)) | |
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230 BAIL_MACRO("VOC sample rate codes differ", 0); |
| 14 | 231 |
| 232 v->rate = uc; | |
| 233 sample->actual.rate = 1000000.0/(256 - v->rate); | |
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234 sample->actual.channels = 1; |
| 14 | 235 v->channels = 1; |
|
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236 } /* if */ |
| 14 | 237 |
|
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238 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
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239 return(0); |
| 14 | 240 |
|
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241 BAIL_IF_MACRO(uc != 0, "VOC: only supports 8-bit data", 0); |
| 14 | 242 |
| 243 v->extended = 0; | |
| 244 v->rest = sblen - 2; | |
| 245 v->size = ST_SIZE_BYTE; | |
|
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246 |
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247 bytes_per_second = sample->actual.rate |
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248 * sample->actual.channels; |
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249 internal->total_time += ( v->rest ) / bytes_per_second * 1000; |
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250 internal->total_time += (v->rest % bytes_per_second) * 1000 |
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251 / bytes_per_second; |
| 14 | 252 return 1; |
| 253 | |
| 254 case VOC_DATA_16: | |
|
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255 if (!voc_readbytes(src, v, &new_rate_long, sizeof (Uint32))) |
| 14 | 256 return 0; |
|
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257 |
| 14 | 258 new_rate_long = SDL_SwapLE32(new_rate_long); |
|
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259 BAIL_IF_MACRO(!new_rate_long, "VOC: Sample rate is zero?", 0); |
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260 |
| 14 | 261 if ((v->rate != -1) && (new_rate_long != v->rate)) |
|
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262 BAIL_MACRO("VOC: sample rate codes differ", 0); |
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263 |
| 14 | 264 v->rate = new_rate_long; |
| 265 sample->actual.rate = new_rate_long; | |
| 266 | |
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267 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 268 return 0; |
| 269 | |
| 270 switch (uc) | |
| 271 { | |
| 272 case 8: v->size = ST_SIZE_BYTE; break; | |
| 273 case 16: v->size = ST_SIZE_WORD; break; | |
| 274 default: | |
|
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275 BAIL_MACRO("VOC: unknown data size", 0); |
|
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276 } /* switch */ |
| 14 | 277 |
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278 if (!voc_readbytes(src, v, &v->channels, sizeof (Uint8))) |
| 14 | 279 return 0; |
| 280 | |
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281 if (!voc_readbytes(src, v, trash, sizeof (Uint8) * 6)) |
| 14 | 282 return 0; |
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283 v->rest = sblen - 12; |
| 14 | 284 |
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285 bytes_per_second = ((v->size == ST_SIZE_WORD) ? (2) : (1)) * |
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286 sample->actual.rate * v->channels; |
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287 internal->total_time += v->rest / bytes_per_second * 1000; |
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288 internal->total_time += ( v->rest % bytes_per_second ) * 1000 |
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289 / bytes_per_second; |
| 14 | 290 return 1; |
| 291 | |
| 292 case VOC_CONT: | |
| 293 v->rest = sblen; | |
| 294 return 1; | |
| 295 | |
| 296 case VOC_SILENCE: | |
|
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297 if (!voc_readbytes(src, v, &period, sizeof (period))) |
| 14 | 298 return 0; |
|
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299 |
| 14 | 300 period = SDL_SwapLE16(period); |
| 301 | |
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302 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 303 return 0; |
|
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304 |
|
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305 BAIL_IF_MACRO(uc == 0, "VOC: silence sample rate is zero", 0); |
| 14 | 306 |
| 307 /* | |
| 308 * Some silence-packed files have gratuitously | |
| 309 * different sample rate codes in silence. | |
| 310 * Adjust period. | |
| 311 */ | |
| 312 if ((v->rate != -1) && (uc != v->rate)) | |
| 313 period = (period * (256 - uc))/(256 - v->rate); | |
| 314 else | |
| 315 v->rate = uc; | |
| 316 v->rest = period; | |
| 317 v->silent = 1; | |
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318 |
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319 internal->total_time += (period) / (v->rate) * 1000; |
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320 internal->total_time += (period % v->rate) * 1000 / v->rate; |
| 14 | 321 return 1; |
| 322 | |
| 323 case VOC_LOOP: | |
| 324 case VOC_LOOPEND: | |
| 325 for(i = 0; i < sblen; i++) /* skip repeat loops. */ | |
| 326 { | |
|
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327 if (!voc_readbytes(src, v, trash, sizeof (Uint8))) |
| 14 | 328 return 0; |
|
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329 } /* for */ |
| 14 | 330 break; |
| 331 | |
| 332 case VOC_EXTENDED: | |
| 333 /* An Extended block is followed by a data block */ | |
| 334 /* Set this byte so we know to use the rate */ | |
| 335 /* value from the extended block and not the */ | |
| 336 /* data block. */ | |
| 337 v->extended = 1; | |
|
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338 if (!voc_readbytes(src, v, &new_rate_short, sizeof (Uint16))) |
| 14 | 339 return 0; |
|
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340 |
| 14 | 341 new_rate_short = SDL_SwapLE16(new_rate_short); |
|
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342 BAIL_IF_MACRO(!new_rate_short, "VOC: sample rate is zero", 0); |
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343 |
| 14 | 344 if ((v->rate != -1) && (new_rate_short != v->rate)) |
|
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345 BAIL_MACRO("VOC: sample rate codes differ", 0); |
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346 |
| 14 | 347 v->rate = new_rate_short; |
| 348 | |
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349 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 350 return 0; |
| 351 | |
|
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352 BAIL_IF_MACRO(uc != 0, "VOC: only supports 8-bit data", 0); |
| 14 | 353 |
|
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354 if (!voc_readbytes(src, v, &uc, sizeof (uc))) |
| 14 | 355 return 0; |
| 356 | |
| 357 if (uc) | |
| 358 sample->actual.channels = 2; /* Stereo */ | |
|
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359 |
| 14 | 360 /* Needed number of channels before finishing |
| 361 compute for rate */ | |
| 362 sample->actual.rate = | |
| 363 (256000000L/(65536L - v->rate)) / sample->actual.channels; | |
| 364 /* An extended block must be followed by a data */ | |
| 365 /* block to be valid so loop back to top so it */ | |
| 366 /* can be grabed. */ | |
| 367 continue; | |
| 368 | |
| 369 case VOC_MARKER: | |
|
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370 if (!voc_readbytes(src, v, trash, sizeof (Uint8) * 2)) |
| 14 | 371 return 0; |
| 372 | |
| 373 /* Falling! Falling! */ | |
| 374 | |
| 375 default: /* text block or other krapola. */ | |
|
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376 for(i = 0; i < sblen; i++) /* skip repeat loops. */ |
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377 { |
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378 if (!voc_readbytes(src, v, trash, sizeof (Uint8))) |
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379 return 0; |
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380 } /* for */ |
| 14 | 381 |
| 382 if (block == VOC_TEXT) | |
| 383 continue; /* get next block */ | |
|
385
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384 } /* switch */ |
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385 } /* while */ |
| 14 | 386 |
| 387 return 1; | |
|
335
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388 } /* voc_get_block */ |
| 14 | 389 |
| 390 | |
|
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391 static int voc_read_waveform(Sound_Sample *sample, int fill_buf, Uint32 max) |
| 14 | 392 { |
| 393 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 394 SDL_RWops *src = internal->rw; | |
| 395 vs_t *v = (vs_t *) internal->decoder_private; | |
| 396 int done = 0; | |
| 397 Uint8 silence = 0x80; | |
| 398 Uint8 *buf = internal->buffer; | |
| 399 | |
| 400 if (v->rest == 0) | |
| 401 { | |
|
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402 if (!voc_get_block(sample, v)) |
| 14 | 403 return 0; |
|
335
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404 } /* if */ |
| 14 | 405 |
| 406 if (v->rest == 0) | |
| 407 return 0; | |
| 408 | |
|
335
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409 max = (v->rest < max) ? v->rest : max; |
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410 |
| 14 | 411 if (v->silent) |
| 412 { | |
| 413 if (v->size == ST_SIZE_WORD) | |
| 414 silence = 0x00; | |
| 415 | |
| 416 /* Fill in silence */ | |
|
335
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417 if (fill_buf) |
|
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418 memset(buf + v->bufpos, silence, max); |
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419 |
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420 done = max; |
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421 v->rest -= done; |
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422 } /* if */ |
| 14 | 423 |
| 424 else | |
| 425 { | |
|
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426 if (fill_buf) |
|
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427 { |
|
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428 done = SDL_RWread(src, buf + v->bufpos, 1, max); |
|
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429 if (done < max) |
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430 { |
|
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431 __Sound_SetError("VOC: i/o error"); |
|
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432 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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433 } /* if */ |
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434 } /* if */ |
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435 |
|
335
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436 else |
|
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437 { |
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438 int cur, rc; |
|
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439 cur = SDL_RWtell(src); |
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440 if (cur >= 0) |
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441 { |
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442 rc = SDL_RWseek(src, max, SEEK_CUR); |
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443 if (rc >= 0) |
|
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444 done = rc - cur; |
|
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445 else |
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446 { |
|
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447 __Sound_SetError("VOC: seek error"); |
|
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448 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
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449 } /* else */ |
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450 } /* if */ |
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451 } /* else */ |
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452 |
| 14 | 453 v->rest -= done; |
| 454 v->bufpos += done; | |
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455 } /* else */ |
| 14 | 456 |
|
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457 return(done); |
|
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458 } /* voc_read_waveform */ |
| 14 | 459 |
| 460 | |
| 461 static int VOC_open(Sound_Sample *sample, const char *ext) | |
| 462 { | |
| 463 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 464 vs_t *v = NULL; | |
| 465 | |
| 466 if (!voc_check_header(internal->rw)) | |
| 467 return(0); | |
| 468 | |
| 469 v = (vs_t *) malloc(sizeof (vs_t)); | |
| 470 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 471 memset(v, '\0', sizeof (vs_t)); | |
| 472 | |
|
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473 v->start_pos = SDL_RWtell(internal->rw); |
| 14 | 474 v->rate = -1; |
|
468
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475 if (!voc_get_block(sample, v)) |
| 14 | 476 { |
| 477 free(v); | |
| 478 return(0); | |
| 479 } /* if */ | |
| 480 | |
| 481 if (v->rate == -1) | |
| 482 { | |
| 483 free(v); | |
|
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484 BAIL_MACRO("VOC: data had no sound!", 0); |
| 14 | 485 } /* if */ |
| 486 | |
|
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487 SNDDBG(("VOC: Accepting data stream.\n")); |
| 14 | 488 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8; |
| 489 sample->actual.channels = v->channels; | |
|
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490 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; |
|
449
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491 internal->decoder_private = v; |
| 14 | 492 return(1); |
| 493 } /* VOC_open */ | |
| 494 | |
| 495 | |
| 496 static void VOC_close(Sound_Sample *sample) | |
| 497 { | |
| 498 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 499 free(internal->decoder_private); | |
| 500 } /* VOC_close */ | |
| 501 | |
| 502 | |
| 503 static Uint32 VOC_read(Sound_Sample *sample) | |
| 504 { | |
| 505 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 506 vs_t *v = (vs_t *) internal->decoder_private; | |
| 507 | |
| 508 v->bufpos = 0; | |
| 509 while (v->bufpos < internal->buffer_size) | |
| 510 { | |
|
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511 Uint32 rc = voc_read_waveform(sample, 1, internal->buffer_size); |
|
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512 if (rc == 0) |
| 14 | 513 { |
|
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514 sample->flags |= (v->error) ? |
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515 SOUND_SAMPLEFLAG_ERROR : |
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516 SOUND_SAMPLEFLAG_EOF; |
| 14 | 517 break; |
| 518 } /* if */ | |
| 519 | |
|
468
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520 if (!voc_get_block(sample, v)) |
| 14 | 521 { |
|
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522 sample->flags |= (v->error) ? |
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523 SOUND_SAMPLEFLAG_ERROR : |
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524 SOUND_SAMPLEFLAG_EOF; |
| 14 | 525 break; |
| 526 } /* if */ | |
| 527 } /* while */ | |
| 528 | |
| 529 return(v->bufpos); | |
| 530 } /* VOC_read */ | |
| 531 | |
|
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532 |
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533 static int VOC_rewind(Sound_Sample *sample) |
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534 { |
|
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535 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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536 vs_t *v = (vs_t *) internal->decoder_private; |
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537 int rc = SDL_RWseek(internal->rw, v->start_pos, SEEK_SET); |
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538 BAIL_IF_MACRO(rc != v->start_pos, ERR_IO_ERROR, 0); |
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539 v->rest = 0; |
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540 return(1); |
|
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541 } /* VOC_rewind */ |
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542 |
|
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543 |
|
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544 static int VOC_seek(Sound_Sample *sample, Uint32 ms) |
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545 { |
|
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546 /* |
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547 * VOCs don't lend themselves well to seeking, since you have to |
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548 * parse each section, which is an arbitrary size. The best we can do |
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549 * is rewind, set a flag saying not to write the waveforms to a buffer, |
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550 * and decode to the point that we want. Ugh. Fortunately, there's |
|
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551 * really no such thing as a large VOC, due to the era and hardware that |
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552 * spawned them, so even though this is inefficient, this is still a |
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553 * relatively fast operation in most cases. |
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554 */ |
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555 |
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556 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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557 vs_t *v = (vs_t *) internal->decoder_private; |
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558 int offset = __Sound_convertMsToBytePos(&sample->actual, ms); |
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559 int origpos = SDL_RWtell(internal->rw); |
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560 int origrest = v->rest; |
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561 |
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562 BAIL_IF_MACRO(!VOC_rewind(sample), NULL, 0); |
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563 |
|
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564 v->bufpos = 0; |
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565 |
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566 while (offset > 0) |
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567 { |
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568 Uint32 rc = voc_read_waveform(sample, 0, offset); |
|
468
cd46c97e58bc
Fixed broken VOC decoder...would always dereference NULL during VOC_open().
Ryan C. Gordon <icculus@icculus.org>
parents:
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|
569 if ( (rc == 0) || (!voc_get_block(sample, v)) ) |
|
335
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570 { |
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571 SDL_RWseek(internal->rw, origpos, SEEK_SET); |
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572 v->rest = origrest; |
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573 return(0); |
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574 } /* if */ |
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575 |
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576 offset -= rc; |
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577 } /* while */ |
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578 |
|
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|
579 return(1); |
|
306
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580 } /* VOC_seek */ |
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581 |
|
64
40006625142a
Changes in preparation of autoconf support.
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|
582 #endif /* SOUND_SUPPORTS_VOC */ |
| 14 | 583 |
| 584 /* end of voc.c ... */ |