annotate decoders/voc.c @ 355:5dbf2f9cde00

Added docs stuff.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 07 Jun 2002 13:26:13 +0000
parents f6475949cd59
children cbb15ecf423a
rev   line source
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1 /*
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2 * SDL_sound -- An abstract sound format decoding API.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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19
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20 /*
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21 * VOC decoder for SDL_sound.
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22 *
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23 * This driver handles Creative Labs VOC audio data...this is a legacy format,
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24 * but there's some game ports that could make use of such a decoder. Plus,
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25 * VOC is fairly straightforward to decode, so this is a more complex, but
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26 * still palatable example of an SDL_sound decoder. Y'know, in case the
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27 * RAW decoder didn't do it for you. :)
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28 *
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29 * This code was ripped from a decoder I had written for SDL_mixer, which was
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30 * largely ripped from sox v12.17.1's voc.c.
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31 *
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32 * SDL_mixer: http://www.libsdl.org/projects/SDL_mixer/
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33 * sox: http://www.freshmeat.net/projects/sox/
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34 *
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35 * Please see the file COPYING in the source's root directory.
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36 *
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37 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
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38 */
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39
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40 #if HAVE_CONFIG_H
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41 # include <config.h>
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42 #endif
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43
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44 #ifdef SOUND_SUPPORTS_VOC
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45
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46 #include <stdio.h>
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47 #include <stdlib.h>
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48 #include <string.h>
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49 #include <assert.h>
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50
106
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51 #include "SDL_sound.h"
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52
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53 #define __SDL_SOUND_INTERNAL__
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54 #include "SDL_sound_internal.h"
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55
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56 static int VOC_init(void);
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57 static void VOC_quit(void);
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58 static int VOC_open(Sound_Sample *sample, const char *ext);
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59 static void VOC_close(Sound_Sample *sample);
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60 static Uint32 VOC_read(Sound_Sample *sample);
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61 static int VOC_rewind(Sound_Sample *sample);
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62 static int VOC_seek(Sound_Sample *sample, Uint32 ms);
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63
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64 static const char *extensions_voc[] = { "VOC", NULL };
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65 const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC =
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66 {
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67 {
149
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68 extensions_voc,
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69 "Creative Labs Voice format",
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70 "Ryan C. Gordon <icculus@clutteredmind.org>",
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71 "http://www.icculus.org/SDL_sound/"
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72 },
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73
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74 VOC_init, /* init() method */
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75 VOC_quit, /* quit() method */
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76 VOC_open, /* open() method */
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77 VOC_close, /* close() method */
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78 VOC_read, /* read() method */
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79 VOC_rewind, /* rewind() method */
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80 VOC_seek /* seek() method */
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81 };
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82
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83
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84 /* Private data for VOC file */
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85 typedef struct vocstuff {
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86 Uint32 rest; /* bytes remaining in current block */
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87 Uint32 rate; /* rate code (byte) of this chunk */
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88 int silent; /* sound or silence? */
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89 Uint32 srate; /* rate code (byte) of silence */
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90 Uint32 blockseek; /* start of current output block */
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91 Uint32 samples; /* number of samples output */
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92 Uint32 size; /* word length of data */
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93 Uint8 channels; /* number of sound channels */
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94 int extended; /* Has an extended block been read? */
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95 Uint32 bufpos; /* byte position in internal->buffer. */
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96 Uint32 start_pos; /* offset to seek to in stream when rewinding. */
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97 } vs_t;
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98
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99 /* Size field */
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100 /* SJB: note that the 1st 3 are sometimes used as sizeof(type) */
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101 #define ST_SIZE_BYTE 1
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102 #define ST_SIZE_8BIT 1
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103 #define ST_SIZE_WORD 2
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104 #define ST_SIZE_16BIT 2
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105 #define ST_SIZE_DWORD 4
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106 #define ST_SIZE_32BIT 4
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107 #define ST_SIZE_FLOAT 5
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108 #define ST_SIZE_DOUBLE 6
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109 #define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */
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110
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111 /* Style field */
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112 #define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */
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113 #define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */
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114 #define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */
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115 #define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */
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116 #define ST_ENCODING_ADPCM 5 /* Compressed PCM */
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117 #define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */
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118 #define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */
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119
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120 #define VOC_TERM 0
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121 #define VOC_DATA 1
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122 #define VOC_CONT 2
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123 #define VOC_SILENCE 3
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124 #define VOC_MARKER 4
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125 #define VOC_TEXT 5
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126 #define VOC_LOOP 6
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127 #define VOC_LOOPEND 7
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128 #define VOC_EXTENDED 8
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129 #define VOC_DATA_16 9
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130
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131
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132 static int VOC_init(void)
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133 {
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134 return(1); /* always succeeds. */
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135 } /* VOC_init */
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136
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137
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138 static void VOC_quit(void)
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139 {
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140 /* it's a no-op. */
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141 } /* VOC_quit */
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142
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143
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144 static inline int voc_check_header(SDL_RWops *src)
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145 {
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146 /* VOC magic header */
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147 Uint8 signature[20]; /* "Creative Voice File\032" */
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148 Uint16 datablockofs;
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149
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150 if (SDL_RWread(src, signature, sizeof (signature), 1) != 1)
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151 return(0);
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152
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153 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) {
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154 Sound_SetError("Unrecognized file type (not VOC)");
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155 return(0);
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156 }
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157
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158 /* get the offset where the first datablock is located */
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Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
159 if (SDL_RWread(src, &datablockofs, sizeof (Uint16), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
160 return(0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
161
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
162 datablockofs = SDL_SwapLE16(datablockofs);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
163
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
164 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
165 return(0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
166
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
167 return(1); /* success! */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
168 } /* voc_check_header */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
169
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
170 /* !!! FIXME : Add a flag to vs_t that distinguishes EOF and Error conditions. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
171
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
172 /* Read next block header, save info, leave position at start of data */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
173 static int voc_get_block(Sound_Sample *sample)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
174 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
175 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
176 SDL_RWops *src = internal->rw;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
177 vs_t *v = (vs_t *) internal->decoder_private;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
178 Uint8 bits24[3];
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
179 Uint8 uc, block;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
180 Uint32 sblen;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
181 Uint16 new_rate_short;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
182 Uint32 new_rate_long;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
183 Uint8 trash[6];
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
184 Uint16 period;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
185 int i;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
186
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
187 v->silent = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188 while (v->rest == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190 if (SDL_RWread(src, &block, sizeof (block), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191 return 1; /* assume that's the end of the file. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193 if (block == VOC_TERM)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197 return 1; /* assume that's the end of the file. */
62
b13fafb976be Changed _D macro to DBGSND.
Ryan C. Gordon <icculus@icculus.org>
parents: 47
diff changeset
198
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199 /* Size is an 24-bit value. Ugh. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) );
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 switch(block)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
203 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
204 case VOC_DATA:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
205 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
206 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
207
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
208 /* When DATA block preceeded by an EXTENDED */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209 /* block, the DATA blocks rate value is invalid */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
210 if (!v->extended)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
211 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 if (uc == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 Sound_SetError("VOC Sample rate is zero?");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
215 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
216 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 if ((v->rate != -1) && (uc != v->rate))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
220 Sound_SetError("VOC sample rate codes differ");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
223
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 v->rate = uc;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 sample->actual.rate = 1000000.0/(256 - v->rate);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226 v->channels = 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
228
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
229 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 if (uc != 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234 Sound_SetError("VOC decoder only interprets 8-bit data");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 v->extended = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239 v->rest = sblen - 2;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240 v->size = ST_SIZE_BYTE;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 case VOC_DATA_16:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 if (SDL_RWread(src, &new_rate_long, sizeof (new_rate_long), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246 new_rate_long = SDL_SwapLE32(new_rate_long);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247 if (new_rate_long == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
248 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
249 Sound_SetError("VOC Sample rate is zero?");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
251 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 if ((v->rate != -1) && (new_rate_long != v->rate))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 Sound_SetError("VOC sample rate codes differ");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257 v->rate = new_rate_long;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 sample->actual.rate = new_rate_long;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 switch (uc)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 case 8: v->size = ST_SIZE_BYTE; break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266 case 16: v->size = ST_SIZE_WORD; break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267 default:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 Sound_SetError("VOC with unknown data size");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 if (SDL_RWread(src, &v->channels, sizeof (Uint8), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275 if (SDL_RWread(src, trash, sizeof (Uint8), 6) != 6)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 v->rest = sblen - 12;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
280
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
281 case VOC_CONT:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282 v->rest = sblen;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285 case VOC_SILENCE:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 if (SDL_RWread(src, &period, sizeof (period), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288 period = SDL_SwapLE16(period);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 if (uc == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
294 Sound_SetError("VOC silence sample rate is zero");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
296 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
297
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
298 /*
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
299 * Some silence-packed files have gratuitously
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
300 * different sample rate codes in silence.
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
301 * Adjust period.
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
302 */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
303 if ((v->rate != -1) && (uc != v->rate))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
304 period = (period * (256 - uc))/(256 - v->rate);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
305 else
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
306 v->rate = uc;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
307 v->rest = period;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
308 v->silent = 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
309 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
310
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
311 case VOC_LOOP:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
312 case VOC_LOOPEND:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
313 for(i = 0; i < sblen; i++) /* skip repeat loops. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
314 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
315 if (SDL_RWread(src, trash, sizeof (Uint8), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
316 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
317 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
318 break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
319
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
320 case VOC_EXTENDED:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
321 /* An Extended block is followed by a data block */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
322 /* Set this byte so we know to use the rate */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
323 /* value from the extended block and not the */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
324 /* data block. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
325 v->extended = 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
326 if (SDL_RWread(src, &new_rate_short, sizeof (new_rate_short), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
327 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
328 new_rate_short = SDL_SwapLE16(new_rate_short);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
329 if (new_rate_short == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
330 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
331 Sound_SetError("VOC sample rate is zero");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
332 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
333 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
334 if ((v->rate != -1) && (new_rate_short != v->rate))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
335 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
336 Sound_SetError("VOC sample rate codes differ");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
337 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
338 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
339 v->rate = new_rate_short;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
340
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
341 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
342 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
343
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
344 if (uc != 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
345 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
346 Sound_SetError("VOC decoder only interprets 8-bit data");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
347 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
348 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
349
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
350 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
351 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
352
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
353 if (uc)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
354 sample->actual.channels = 2; /* Stereo */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
355 /* Needed number of channels before finishing
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
356 compute for rate */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
357 sample->actual.rate =
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
358 (256000000L/(65536L - v->rate)) / sample->actual.channels;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
359 /* An extended block must be followed by a data */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
360 /* block to be valid so loop back to top so it */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
361 /* can be grabed. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
362 continue;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
363
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
364 case VOC_MARKER:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
365 if (SDL_RWread(src, trash, sizeof (Uint8), 2) != 2)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
366 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
367
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
368 /* Falling! Falling! */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
369
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
370 default: /* text block or other krapola. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
371 for(i = 0; i < sblen; i++)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
372 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
373 if (SDL_RWread(src, &trash, sizeof (Uint8), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
374 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
375 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
376
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
377 if (block == VOC_TEXT)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
378 continue; /* get next block */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
379 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
380 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
381
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
382 return 1;
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
383 } /* voc_get_block */
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
384
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
385
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
386 static int voc_read_waveform(Sound_Sample *sample, int fill_buf, Uint32 max)
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
387 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
388 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
389 SDL_RWops *src = internal->rw;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
390 vs_t *v = (vs_t *) internal->decoder_private;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
391 int done = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
392 Uint8 silence = 0x80;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
393 Uint8 *buf = internal->buffer;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
394
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
395 if (v->rest == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
396 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
397 if (!voc_get_block(sample))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
398 return 0;
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
399 } /* if */
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
400
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
401 if (v->rest == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
402 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
403
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
404 max = (v->rest < max) ? v->rest : max;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
405
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
406 if (v->silent)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
407 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
408 if (v->size == ST_SIZE_WORD)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
409 silence = 0x00;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
410
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
411 /* Fill in silence */
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
412 if (fill_buf)
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
413 memset(buf + v->bufpos, silence, max);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
414
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
415 done = max;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
416 v->rest -= done;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
417 } /* if */
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
418
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
419 else
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
420 {
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
421 if (fill_buf)
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
422 done = SDL_RWread(src, buf + v->bufpos, 1, max);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
423 else
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
424 {
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
425 int cur, rc;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
426 cur = SDL_RWtell(src);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
427 if (cur >= 0)
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
428 {
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
429 rc = SDL_RWseek(src, max, SEEK_CUR);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
430 if (rc >= 0)
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
431 done = rc - cur;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
432 } /* if */
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
433 } /* else */
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
434
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
435 v->rest -= done;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
436 v->bufpos += done;
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
437 } /* else */
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
438
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
439 return done;
22
f6e679afe88b Byte ordering fix, changed voc_read to voc_read_waveform, and cleaned up
Ryan C. Gordon <icculus@icculus.org>
parents: 14
diff changeset
440 } /* voc_read_waveform */
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
441
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
442
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
443 static int VOC_open(Sound_Sample *sample, const char *ext)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
444 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
445 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
446 vs_t *v = NULL;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
447
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
448 if (!voc_check_header(internal->rw))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
449 return(0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
450
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
451 v = (vs_t *) malloc(sizeof (vs_t));
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
452 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
453 memset(v, '\0', sizeof (vs_t));
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
454 internal->decoder_private = v;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
455
224
1bafef18dabf Implemented rewind method.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
456 v->start_pos = SDL_RWtell(internal->rw);
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
457 v->rate = -1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
458 if (!voc_get_block(sample))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
459 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
460 free(v);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
461 return(0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
462 } /* if */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
463
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
464 if (v->rate == -1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
465 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
466 Sound_SetError("VOC data had no sound!");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
467 free(v);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
468 return(0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
469 } /* if */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
470
62
b13fafb976be Changed _D macro to DBGSND.
Ryan C. Gordon <icculus@icculus.org>
parents: 47
diff changeset
471 SNDDBG(("VOC: Accepting data stream.\n"));
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
472 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
473 sample->actual.channels = v->channels;
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
474 sample->flags = SOUND_SAMPLEFLAG_CANSEEK;
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
475 return(1);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
476 } /* VOC_open */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
477
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
478
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
479 static void VOC_close(Sound_Sample *sample)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
480 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
481 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
482 free(internal->decoder_private);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
483 } /* VOC_close */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
484
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
485
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
486 static Uint32 VOC_read(Sound_Sample *sample)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
487 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
488 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
489 vs_t *v = (vs_t *) internal->decoder_private;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
490
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
491 v->bufpos = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
492 while (v->bufpos < internal->buffer_size)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
493 {
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
494 Uint32 rc = voc_read_waveform(sample, 1, internal->buffer_size);
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
495 if (rc == 0) /* !!! FIXME: Could be an error... */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
496 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
497 sample->flags |= SOUND_SAMPLEFLAG_EOF;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
498 break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
499 } /* if */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
500
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
501 if (!voc_get_block(sample))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
502 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
503 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
504 break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
505 } /* if */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
506 } /* while */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
507
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
508 return(v->bufpos);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
509 } /* VOC_read */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
510
221
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 184
diff changeset
511
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 184
diff changeset
512 static int VOC_rewind(Sound_Sample *sample)
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 184
diff changeset
513 {
224
1bafef18dabf Implemented rewind method.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
514 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
1bafef18dabf Implemented rewind method.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
515 vs_t *v = (vs_t *) internal->decoder_private;
1bafef18dabf Implemented rewind method.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
516 int rc = SDL_RWseek(internal->rw, v->start_pos, SEEK_SET);
1bafef18dabf Implemented rewind method.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
517 BAIL_IF_MACRO(rc != v->start_pos, ERR_IO_ERROR, 0);
1bafef18dabf Implemented rewind method.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
518 v->rest = 0;
1bafef18dabf Implemented rewind method.
Ryan C. Gordon <icculus@icculus.org>
parents: 221
diff changeset
519 return(1);
221
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 184
diff changeset
520 } /* VOC_rewind */
c9772a9f5271 Initial implementation or stubs for rewind method. Other cleanups.
Ryan C. Gordon <icculus@icculus.org>
parents: 184
diff changeset
521
306
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 301
diff changeset
522
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 301
diff changeset
523 static int VOC_seek(Sound_Sample *sample, Uint32 ms)
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 301
diff changeset
524 {
335
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
525 /*
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
526 * VOCs don't lend themselves well to seeking, since you have to
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
527 * parse each section, which is an arbitrary size. The best we can do
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
528 * is rewind, set a flag saying not to write the waveforms to a buffer,
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
529 * and decode to the point that we want. Ugh. Fortunately, there's
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
530 * really no such thing as a large VOC, due to the era and hardware that
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
531 * spawned them, so even though this is inefficient, this is still a
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
532 * relatively fast operation in most cases.
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
533 */
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
534
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
535 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
536 vs_t *v = (vs_t *) internal->decoder_private;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
537 int offset = __Sound_convertMsToBytePos(&sample->actual, ms);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
538 int origpos = SDL_RWtell(internal->rw);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
539 int origrest = v->rest;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
540
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
541 BAIL_IF_MACRO(!VOC_rewind(sample), NULL, 0);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
542
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
543 v->bufpos = 0;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
544
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
545 while (offset > 0)
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
546 {
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
547 Uint32 rc = voc_read_waveform(sample, 0, offset);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
548 if ( (rc == 0) || (!voc_get_block(sample)) )
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
549 {
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
550 SDL_RWseek(internal->rw, origpos, SEEK_SET);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
551 v->rest = origrest;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
552 return(0);
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
553 } /* if */
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
554
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
555 offset -= rc;
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
556 } /* while */
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
557
f6475949cd59 Implemented seek method.
Ryan C. Gordon <icculus@icculus.org>
parents: 306
diff changeset
558 return(1);
306
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 301
diff changeset
559 } /* VOC_seek */
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
parents: 301
diff changeset
560
64
40006625142a Changes in preparation of autoconf support.
Ryan C. Gordon <icculus@icculus.org>
parents: 62
diff changeset
561 #endif /* SOUND_SUPPORTS_VOC */
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
562
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
563 /* end of voc.c ... */