annotate decoders/voc.c @ 47:ea58bc3b15d7

Added init() and quit() methods.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 22 Sep 2001 14:41:38 +0000
parents 4a60ee42ca9a
children b13fafb976be
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 LICENSE 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 #include <stdio.h>
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41 #include <stdlib.h>
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42 #include <string.h>
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43 #include <assert.h>
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44 #include "SDL_sound.h"
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45
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46 #define __SDL_SOUND_INTERNAL__
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47 #include "SDL_sound_internal.h"
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48
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49 #if (!defined SOUND_SUPPORTS_VOC)
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50 #error SOUND_SUPPORTS_VOC must be defined.
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51 #endif
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52
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53
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54 static int VOC_init(void);
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55 static void VOC_quit(void);
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56 static int VOC_open(Sound_Sample *sample, const char *ext);
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57 static void VOC_close(Sound_Sample *sample);
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58 static Uint32 VOC_read(Sound_Sample *sample);
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59
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60 const Sound_DecoderFunctions __Sound_DecoderFunctions_VOC =
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61 {
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62 {
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63 "VOC",
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64 "Creative Labs Voice format",
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65 "Ryan C. Gordon <icculus@clutteredmind.org>",
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66 "http://www.icculus.org/SDL_sound/"
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67 },
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68
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69 VOC_init, /* init() method */
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70 VOC_quit, /* quit() method */
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71 VOC_open, /* open() method */
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72 VOC_close, /* close() method */
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73 VOC_read /* read() method */
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74 };
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75
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76
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77 /* Private data for VOC file */
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78 typedef struct vocstuff {
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79 Uint32 rest; /* bytes remaining in current block */
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80 Uint32 rate; /* rate code (byte) of this chunk */
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81 int silent; /* sound or silence? */
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82 Uint32 srate; /* rate code (byte) of silence */
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83 Uint32 blockseek; /* start of current output block */
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84 Uint32 samples; /* number of samples output */
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85 Uint32 size; /* word length of data */
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86 Uint8 channels; /* number of sound channels */
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87 int extended; /* Has an extended block been read? */
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88 Uint32 bufpos; /* byte position in internal->buffer. */
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89 } vs_t;
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90
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91 /* Size field */
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92 /* SJB: note that the 1st 3 are sometimes used as sizeof(type) */
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93 #define ST_SIZE_BYTE 1
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94 #define ST_SIZE_8BIT 1
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95 #define ST_SIZE_WORD 2
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96 #define ST_SIZE_16BIT 2
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97 #define ST_SIZE_DWORD 4
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98 #define ST_SIZE_32BIT 4
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99 #define ST_SIZE_FLOAT 5
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100 #define ST_SIZE_DOUBLE 6
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101 #define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */
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102
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103 /* Style field */
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104 #define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */
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105 #define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */
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106 #define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */
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107 #define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */
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108 #define ST_ENCODING_ADPCM 5 /* Compressed PCM */
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109 #define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */
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110 #define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */
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111
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112 #define VOC_TERM 0
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113 #define VOC_DATA 1
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114 #define VOC_CONT 2
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115 #define VOC_SILENCE 3
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116 #define VOC_MARKER 4
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117 #define VOC_TEXT 5
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118 #define VOC_LOOP 6
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119 #define VOC_LOOPEND 7
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120 #define VOC_EXTENDED 8
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121 #define VOC_DATA_16 9
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122
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123
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124 static int VOC_init(void)
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125 {
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126 return(1); /* always succeeds. */
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127 } /* VOC_init */
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128
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129
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130 static void VOC_quit(void)
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131 {
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132 /* it's a no-op. */
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133 } /* VOC_quit */
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134
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135
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136 static __inline__ int voc_check_header(SDL_RWops *src)
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137 {
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138 /* VOC magic header */
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139 Uint8 signature[20]; /* "Creative Voice File\032" */
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140 Uint16 datablockofs;
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141
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142 if (SDL_RWread(src, signature, sizeof (signature), 1) != 1)
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143 return(0);
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144
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145 if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) {
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146 Sound_SetError("Unrecognized file type (not VOC)");
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147 return(0);
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148 }
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149
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150 /* get the offset where the first datablock is located */
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151 if (SDL_RWread(src, &datablockofs, sizeof (Uint16), 1) != 1)
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152 return(0);
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153
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154 datablockofs = SDL_SwapLE16(datablockofs);
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155
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156 if (SDL_RWseek(src, datablockofs, SEEK_SET) != datablockofs)
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157 return(0);
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158
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159 return(1); /* success! */
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160 } /* voc_check_header */
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161
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162 /* !!! FIXME : Add a flag to vs_t that distinguishes EOF and Error conditions. */
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diff changeset
163
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
164 /* Read next block header, save info, leave position at start of data */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
165 static int voc_get_block(Sound_Sample *sample)
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 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
168 SDL_RWops *src = internal->rw;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
169 vs_t *v = (vs_t *) internal->decoder_private;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
170 Uint8 bits24[3];
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
171 Uint8 uc, block;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
172 Uint32 sblen;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
173 Uint16 new_rate_short;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
174 Uint32 new_rate_long;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
175 Uint8 trash[6];
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
176 Uint16 period;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
177 int i;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
178
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
179 v->silent = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
180 while (v->rest == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
181 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
182 if (SDL_RWread(src, &block, sizeof (block), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
183 return 1; /* assume that's the end of the file. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
184
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
185 if (block == VOC_TERM)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
186 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
187
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188 if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 return 1; /* assume that's the end of the file. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191 /* Size is an 24-bit value. Ugh. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192 sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) );
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194 switch(block)
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 case VOC_DATA:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
198 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 /* When DATA block preceeded by an EXTENDED */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201 /* block, the DATA blocks rate value is invalid */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 if (!v->extended)
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 if (uc == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
205 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
206 Sound_SetError("VOC Sample rate is zero?");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
207 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
208 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
210 if ((v->rate != -1) && (uc != v->rate))
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 Sound_SetError("VOC sample rate codes differ");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
215
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
216 v->rate = uc;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217 sample->actual.rate = 1000000.0/(256 - v->rate);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 v->channels = 1;
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
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222 return 0;
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 if (uc != 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226 Sound_SetError("VOC decoder only interprets 8-bit data");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 return 0;
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
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230 v->extended = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 v->rest = sblen - 2;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 v->size = ST_SIZE_BYTE;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 case VOC_DATA_16:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 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
237 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 new_rate_long = SDL_SwapLE32(new_rate_long);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239 if (new_rate_long == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241 Sound_SetError("VOC Sample rate is zero?");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 if ((v->rate != -1) && (new_rate_long != v->rate))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246 Sound_SetError("VOC sample rate codes differ");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247 return 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 v->rate = new_rate_long;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 sample->actual.rate = new_rate_long;
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 (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 switch (uc)
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 case 8: v->size = ST_SIZE_BYTE; break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 case 16: v->size = ST_SIZE_WORD; break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259 default:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260 Sound_SetError("VOC with unknown data size");
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
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264 if (SDL_RWread(src, &v->channels, sizeof (Uint8), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267 if (SDL_RWread(src, trash, sizeof (Uint8), 6) != 6)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270 v->rest = sblen - 12;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 case VOC_CONT:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 v->rest = sblen;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275 return 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 case VOC_SILENCE:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 if (SDL_RWread(src, &period, sizeof (period), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
280 period = SDL_SwapLE16(period);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
281
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284 if (uc == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 Sound_SetError("VOC silence sample rate is zero");
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 }
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 /*
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291 * Some silence-packed files have gratuitously
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 * different sample rate codes in silence.
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 * Adjust period.
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
294 */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295 if ((v->rate != -1) && (uc != v->rate))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
296 period = (period * (256 - uc))/(256 - v->rate);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
297 else
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
298 v->rate = uc;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
299 v->rest = period;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
300 v->silent = 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
301 return 1;
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 case VOC_LOOP:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
304 case VOC_LOOPEND:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
305 for(i = 0; i < sblen; i++) /* skip repeat loops. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
306 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
307 if (SDL_RWread(src, trash, sizeof (Uint8), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
308 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
309 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
310 break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
311
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
312 case VOC_EXTENDED:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
313 /* An Extended block is followed by a data block */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
314 /* Set this byte so we know to use the rate */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
315 /* value from the extended block and not the */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
316 /* data block. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
317 v->extended = 1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
318 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
319 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
320 new_rate_short = SDL_SwapLE16(new_rate_short);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
321 if (new_rate_short == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
322 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
323 Sound_SetError("VOC sample rate is zero");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
324 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
325 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
326 if ((v->rate != -1) && (new_rate_short != v->rate))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
327 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
328 Sound_SetError("VOC sample rate codes differ");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
329 return 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 v->rate = new_rate_short;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
332
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
333 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
334 return 0;
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 if (uc != 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
337 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
338 Sound_SetError("VOC decoder only interprets 8-bit data");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
339 return 0;
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
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
342 if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
343 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
344
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
345 if (uc)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
346 sample->actual.channels = 2; /* Stereo */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
347 /* Needed number of channels before finishing
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
348 compute for rate */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
349 sample->actual.rate =
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
350 (256000000L/(65536L - v->rate)) / sample->actual.channels;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
351 /* An extended block must be followed by a data */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
352 /* block to be valid so loop back to top so it */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
353 /* can be grabed. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
354 continue;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
355
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
356 case VOC_MARKER:
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
357 if (SDL_RWread(src, trash, sizeof (Uint8), 2) != 2)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
358 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
359
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
360 /* Falling! Falling! */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
361
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
362 default: /* text block or other krapola. */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
363 for(i = 0; i < sblen; i++)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
364 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
365 if (SDL_RWread(src, &trash, sizeof (Uint8), 1) != 1)
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
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
369 if (block == VOC_TEXT)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
370 continue; /* get next block */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
371 }
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
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
374 return 1;
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
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
378 static int voc_read_waveform(Sound_Sample *sample)
14
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 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
381 SDL_RWops *src = internal->rw;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
382 vs_t *v = (vs_t *) internal->decoder_private;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
383 int done = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
384 Uint8 silence = 0x80;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
385 Uint8 *buf = internal->buffer;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
386
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
387 if (v->rest == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
388 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
389 if (!voc_get_block(sample))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
390 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
391 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
392
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
393 if (v->rest == 0)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
394 return 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
395
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
396 if (v->silent)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
397 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
398 if (v->size == ST_SIZE_WORD)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
399 silence = 0x00;
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 /* Fill in silence */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
402 memset(buf, silence, v->rest);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
403 done = v->rest;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
404 v->rest = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
405 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
406
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
407 else
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
408 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
409 Uint32 max = (v->rest < internal->buffer_size) ?
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
410 v->rest : internal->buffer_size;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
411 done = SDL_RWread(src, buf + v->bufpos, 1, max);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
412 v->rest -= done;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
413 v->bufpos += done;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
414 }
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
415
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
416 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
417 } /* voc_read_waveform */
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
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
420 static int VOC_open(Sound_Sample *sample, const char *ext)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
421 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
422 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
423 vs_t *v = NULL;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
424
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
425 if (!voc_check_header(internal->rw))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
426 return(0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
427
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
428 v = (vs_t *) malloc(sizeof (vs_t));
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
429 BAIL_IF_MACRO(v == NULL, ERR_OUT_OF_MEMORY, 0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
430 memset(v, '\0', sizeof (vs_t));
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
431 internal->decoder_private = v;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
432
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
433 v->rate = -1;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
434 if (!voc_get_block(sample))
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
435 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
436 free(v);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
437 return(0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
438 } /* if */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
439
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
440 if (v->rate == -1)
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 Sound_SetError("VOC data had no sound!");
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
443 free(v);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
444 return(0);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
445 } /* if */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
446
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
447 _D(("VOC: Accepting data stream.\n"));
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
448 sample->actual.format = (v->size == ST_SIZE_WORD) ? AUDIO_S16LSB:AUDIO_U8;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
449 sample->actual.channels = v->channels;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
450 sample->flags = SOUND_SAMPLEFLAG_NONE;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
451 return(1);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
452 } /* VOC_open */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
453
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
454
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
455 static void VOC_close(Sound_Sample *sample)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
456 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
457 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
458 free(internal->decoder_private);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
459 } /* VOC_close */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
460
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
461
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
462 static Uint32 VOC_read(Sound_Sample *sample)
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 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
465 vs_t *v = (vs_t *) internal->decoder_private;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
466
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
467 v->bufpos = 0;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
468 while (v->bufpos < internal->buffer_size)
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
469 {
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
470 Uint32 rc = voc_read_waveform(sample);
14
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
471 if (rc == 0) /* !!! FIXME: Could be an error... */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
472 {
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
473 sample->flags |= SOUND_SAMPLEFLAG_EOF;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
474 break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
475 } /* if */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
476
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
477 if (!voc_get_block(sample))
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 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
480 break;
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
481 } /* if */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
482 } /* while */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
483
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
484 return(v->bufpos);
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
485 } /* VOC_read */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
486
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 /* end of voc.c ... */
41e5e07c5fed Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
489