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398
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1 /* miscplay.c - general routines related to playing sounds
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2 **
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3 ** Copyright (C) 1995,96 by Markus Gutschke (gutschk@math.uni-muenster.de)
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4 ** This was sawed out from version 1.3 of linuxplay.c by
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5 ** Robert Bihlmeyer <robbe@orcus.priv.at>.
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6 **
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7 ** Parts of this code were inspired by sunplay.c, which is copyright 1989 by
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8 ** Jef Poskanzer and 1991,92 by Jamie Zawinski; c.f. sunplay.c for further
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9 ** information.
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10 **
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11 ** Permission to use, copy, modify, and distribute this software and its
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12 ** documentation for any purpose and without fee is hereby granted, provided
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13 ** that the above copyright notice appear in all copies and that both that
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14 ** copyright notice and this permission notice appear in supporting
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15 ** documentation. This software is provided "as is" without express or
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16 ** implied warranty.
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17 */
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18
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19 #ifdef HAVE_CONFIG_H
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20 #include <config.h>
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21 #endif
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22
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23 #include "miscplay.h"
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24 #include "lisp.h"
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25 #include "syssignal.h"
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26 #include "sysfile.h"
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27 #define warn(str) message("audio: %s ",GETTEXT(str))
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28
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29 #include <stdlib.h>
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30
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31 #ifdef __GNUC__
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32 #define UNUSED(x) ((void)(x))
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33 #else
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34 #define UNUSED(x)
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35 #define __inline__
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36 #endif
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37
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38 /* Maintain global variable for keeping parser state information; this struct
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39 is set to zero before the first invocation of the parser. The use of a
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40 global variable prevents multiple concurrent executions of this code, but
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41 this does not happen anyways... */
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42 enum wvState
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43 { wvMain,
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44 wvSubchunk,
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45 wvOutOfBlock,
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46 wvSkipChunk,
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47 wvSoundChunk,
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48 wvFatal,
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49 wvFatalNotify
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50 };
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51
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52 static union {
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53 struct {
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54 int align;
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55 enum wvState state;
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56 size_t left;
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57 unsigned char leftover[HEADERSZ];
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58 signed long chunklength;
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59 } wave;
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60 struct {
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61 int align;
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62 int isdata;
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63 int skipping;
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64 size_t left;
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65 unsigned char leftover[HEADERSZ];
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66 } audio;
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67 } parsestate;
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68
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69 /* Use a global buffer as scratch-pad for possible conversions of the
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70 sampling format */
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71 unsigned char miscplay_sndbuf[SNDBUFSZ];
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72
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73 /* Initialize global parser state information to zero */
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74 void reset_parsestate()
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75 {
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76 memset(&parsestate,0,sizeof(parsestate));
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77 }
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78
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79 /* Verify that we could fully parse the entire soundfile; this is needed
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80 only for files in WAVE format */
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81 int parse_wave_complete()
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82 {
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83 if (parsestate.wave.state != wvOutOfBlock &&
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84 parsestate.wave.state != wvFatal) {
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85 warn("Unexpected end of WAVE file");
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86 return 0;
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87 } else
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88 return 1;
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89 }
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90
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91 /* There is no special treatment required for parsing raw data files; we
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92 assume that these files contain data in 8bit unsigned format that
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93 has been sampled at 8kHz; there is no extra header */
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94 static size_t parseraw(void **data,size_t *sz,void **outbuf)
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95 {
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96 int rc = *sz;
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97
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98 *outbuf = *data;
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99 *sz = 0;
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100 return(rc);
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101 }
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102
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103 /* Currently we cannot cope with files in VOC format; if you really need
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104 to play these files, they should be converted by using SOX */
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105 static size_t parsevoc(void **data,size_t *sz,void **outbuf)
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106 {
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107 UNUSED(data);
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108 UNUSED(sz);
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109 UNUSED(outbuf);
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110 return(0);
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111 }
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112
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113 /* We need to perform some look-ahead in order to parse files in WAVE format;
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114 this might require re-partioning of the data segments if headers cross the
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115 boundaries between two read operations. This is done in a two-step way:
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116 first we request a certain amount of bytes... */
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117 static __inline__ int waverequire(void **data,size_t *sz,size_t rq)
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118 {
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119 int rc = 1;
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120
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121 if (rq > HEADERSZ) {
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122 warn("Header size exceeded while parsing WAVE file");
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123 parsestate.wave.state = wvFatal;
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124 *sz = 0;
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125 return(0); }
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126 if ((rq -= parsestate.wave.left) <= 0)
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127 return(rc);
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128 if (rq > *sz) {rq = *sz; rc = 0;}
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129 memcpy(parsestate.wave.leftover+parsestate.wave.left,
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130 *data,rq);
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131 parsestate.wave.left += rq;
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132 (*(unsigned char **)data) += rq;
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133 *sz -= rq;
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134 return(rc);
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135 }
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136
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137 /* ...and next we remove this many bytes from the buffer */
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138 static __inline__ void waveremove(size_t rq)
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139 {
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140 if (parsestate.wave.left <= rq)
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141 parsestate.wave.left = 0;
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142 else {
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143 parsestate.wave.left -= rq;
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144 memmove(parsestate.wave.leftover,
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145 parsestate.wave.leftover+rq,
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146 parsestate.wave.left); }
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147 return;
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148 }
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149
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150 /* Sound files in WAVE format can contain an arbitrary amount of tagged
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151 chunks; this requires quite some effort for parsing the data */
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152 static size_t parsewave(void **data,size_t *sz,void **outbuf)
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153 {
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154 for (;;)
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155 switch (parsestate.wave.state) {
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156 case wvMain:
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157 if (!waverequire(data,sz,20))
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158 return(0);
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159 /* Keep compatibility with Linux 68k, etc. by not relying on byte-sex */
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160 parsestate.wave.chunklength = parsestate.wave.leftover[16] +
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161 256*(parsestate.wave.leftover[17] +
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162 256*(parsestate.wave.leftover[18] +
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163 256*parsestate.wave.leftover[19]));
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164 waveremove(20);
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165 parsestate.wave.state = wvSubchunk;
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166 break;
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167 case wvSubchunk:
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168 if (!waverequire(data,sz,parsestate.wave.chunklength))
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169 return(0);
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170 parsestate.wave.align = parsestate.wave.chunklength < 14 ? 1
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171 : parsestate.wave.leftover[12];
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172 if (parsestate.wave.align != 1 &&
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173 parsestate.wave.align != 2 &&
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174 parsestate.wave.align != 4) {
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175 warn("Illegal datawidth detected while parsing WAVE file");
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176 parsestate.wave.state = wvFatal; }
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177 else
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178 parsestate.wave.state = wvOutOfBlock;
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179 waveremove(parsestate.wave.chunklength);
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180 break;
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181 case wvOutOfBlock:
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182 if (!waverequire(data,sz,8))
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183 return(0);
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184 /* Keep compatibility with Linux 68k, etc. by not relying on byte-sex */
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185 parsestate.wave.chunklength = parsestate.wave.leftover[4] +
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186 256*(parsestate.wave.leftover[5] +
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187 256*(parsestate.wave.leftover[6] +
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188 256*(parsestate.wave.leftover[7] & 0x7F)));
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189 if (memcmp(parsestate.wave.leftover,"data",4))
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190 parsestate.wave.state = wvSkipChunk;
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191 else
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192 parsestate.wave.state = wvSoundChunk;
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193 waveremove(8);
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194 break;
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195 case wvSkipChunk:
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196 if (parsestate.wave.chunklength > 0 && *sz > 0 &&
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197 (signed long)*sz < (signed long)parsestate.wave.chunklength) {
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198 parsestate.wave.chunklength -= *sz;
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199 *sz = 0; }
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200 else {
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201 if (parsestate.wave.chunklength > 0 && *sz > 0) {
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202 *sz -= parsestate.wave.chunklength;
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203 (*(unsigned char **)data) += parsestate.wave.chunklength; }
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204 parsestate.wave.state = wvOutOfBlock; }
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205 break;
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206 case wvSoundChunk: {
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207 size_t count,rq;
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208 if (parsestate.wave.left) { /* handle leftover bytes from last
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209 alignment operation */
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210 count = parsestate.wave.left;
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211 rq = HEADERSZ-count;
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212 if (rq > (size_t) parsestate.wave.chunklength)
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213 rq = parsestate.wave.chunklength;
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214 if (!waverequire(data,sz,rq)) {
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215 parsestate.wave.chunklength -= parsestate.wave.left - count;
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216 return(0); }
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217 parsestate.wave.chunklength -= rq;
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218 *outbuf = parsestate.wave.leftover;
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219 parsestate.wave.left = 0;
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220 return(rq); }
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221 if (*sz >= (size_t) parsestate.wave.chunklength) {
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222 count = parsestate.wave.chunklength;
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223 rq = 0; }
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224 else {
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225 count = *sz;
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226 count -= rq = count % parsestate.wave.align; }
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227 *outbuf = *data;
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228 (*(unsigned char **)data) += count;
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229 *sz -= count;
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230 if ((parsestate.wave.chunklength -= count) < parsestate.wave.align) {
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231 parsestate.wave.state = wvOutOfBlock;
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232 /* Some broken software (e.g. SOX) attaches junk to the end of a sound
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233 chunk; so, let's ignore this... */
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234 if (parsestate.wave.chunklength)
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235 parsestate.wave.state = wvSkipChunk; }
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236 else if (rq)
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237 /* align data length to a multiple of datasize; keep additional data
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238 in "leftover" buffer --- this is necessary to ensure proper
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239 functioning of the sndcnv... routines */
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240 waverequire(data,sz,rq);
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241 return(count); }
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242 case wvFatalNotify:
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243 warn("Irrecoverable error while parsing WAVE file");
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244 parsestate.wave.state = wvFatal;
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245 break;
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246 case wvFatal:
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247 default:
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248 *sz = 0;
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249 return(0); }
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250 }
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251
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252 /* Strip the header from files in Sun/DEC audio format; this requires some
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253 extra processing as the header can be an arbitrary size and it might
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254 result in alignment errors for subsequent conversions --- thus we do
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255 some buffering, where needed */
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256 static size_t parsesundecaudio(void **data,size_t *sz,void **outbuf)
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257 {
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258 /* There is data left over from the last invocation of this function; join
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259 it with the new data and return a sound chunk that is as big as a
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260 single entry */
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261 if (parsestate.audio.left) {
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262 if (parsestate.audio.left + *sz > (size_t) parsestate.audio.align) {
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263 int count;
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264 memmove(parsestate.audio.leftover + parsestate.audio.left,
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265 *data,
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266 count = parsestate.audio.align - parsestate.audio.left);
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267 *outbuf = parsestate.audio.leftover;
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268 *sz -= count;
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269 *data = (*(char **)data) + count;
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270 parsestate.audio.left = 0;
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271 return(parsestate.audio.align); }
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272 else {
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273 /* We need even more data in order to get one complete single entry! */
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274 memmove(parsestate.audio.leftover + parsestate.audio.left,
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275 *data,
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276 *sz);
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277 *data = (*(char **)data) + *sz;
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278 parsestate.audio.left += *sz;
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279 *sz = 0;
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280 return(0); } }
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281
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282 /* This is the main sound chunk, strip of any extra data that does not fit
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283 the alignment requirements and move these bytes into the leftover buffer*/
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284 if (parsestate.audio.isdata) {
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285 int rc = *sz;
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286 *outbuf = *data;
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287 if ((parsestate.audio.left = rc % parsestate.audio.align) != 0) {
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288 memmove(parsestate.audio.leftover,
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289 (char *)*outbuf + rc - parsestate.audio.left,
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290 parsestate.audio.left);
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291 rc -= parsestate.audio.left; }
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292 *sz = 0;
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293 return(rc); }
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294
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295 /* This is the first invocation of this function; we need to parse the
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296 header information and determine how many bytes we need to skip until
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297 the start of the sound chunk */
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298 if (!parsestate.audio.skipping) {
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299 unsigned char *header = (unsigned char *) *data;
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300 if (*sz < 8) {
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301 warn("Irrecoverable error while parsing Sun/DEC audio file");
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302 return(0); }
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303 /* Keep compatibility with Linux 68k, etc. by not relying on byte-sex */
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304 if (header[3]) { /* Sun audio (big endian) */
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305 parsestate.audio.align = ((header[15] > 2)+1)*header[23];
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306 parsestate.audio.skipping = header[7]+256*(header[6]+256*
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307 (header[5]+256*header[4])); }
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308 else { /* DEC audio (little endian) */
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309 parsestate.audio.align = ((header[12] > 2)+1)*header[20];
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310 parsestate.audio.skipping = header[4]+256*(header[5]+256*
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311 (header[6]+256*header[7])); }}
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312
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313 /* We are skipping extra data that has been attached to header; most usually
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314 this will be just a comment, such as the original filename and/or the
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315 creation date. Make sure that we do not return less than one single sound
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316 sample entry to the caller; if this happens, rather decide to move those
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317 few bytes into the leftover buffer and deal with it later */
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318 if (*sz >= (size_t) parsestate.audio.skipping) {
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319 /* Skip just the header information and return the sound chunk */
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320 int rc = *sz - parsestate.audio.skipping;
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321 *outbuf = (char *)*data + parsestate.audio.skipping;
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322 if ((parsestate.audio.left = rc % parsestate.audio.align) != 0) {
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323 memmove(parsestate.audio.leftover,
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324 (char *)*outbuf + rc - parsestate.audio.left,
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325 parsestate.audio.left);
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326 rc -= parsestate.audio.left; }
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327 *sz = 0;
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328 parsestate.audio.skipping = 0;
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329 parsestate.audio.isdata++;
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330 return(rc); }
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331 else {
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332 /* Skip everything */
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333 parsestate.audio.skipping -= *sz;
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334 return(0); }
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335 }
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336
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337 /* If the soundcard could not be set to natively support the data format, we
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338 try to do some limited on-the-fly conversion to a different format; if
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339 no conversion is needed, though, we can output directly */
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340 size_t sndcnvnop(void **data,size_t *sz,void **outbuf)
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341 {
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342 int rc = *sz;
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343
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344 *outbuf = *data;
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345 *sz = 0;
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346 return(rc);
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347 }
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348
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349 /* Convert 8 bit unsigned stereo data to 8 bit unsigned mono data */
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350 size_t sndcnv8U_2mono(void **data,size_t *sz,void **outbuf)
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351 {
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352 REGISTER unsigned char *src;
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353 REGISTER unsigned char *dest;
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354 int rc,count;
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355
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356 count = *sz / 2;
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357 if (count > SNDBUFSZ) { *sz -= 2*SNDBUFSZ; count = SNDBUFSZ; }
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358 else *sz = 0;
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359 rc = count;
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360 src = (unsigned char *) *data;
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361 *outbuf =
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362 dest = miscplay_sndbuf;
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363 while (count--)
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364 *dest++ = (unsigned char)(((int)*(src)++ +
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365 (int)*(src)++) / 2);
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366 *data = src;
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367 return(rc);
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368 }
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369
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370 /* Convert 8 bit signed stereo data to 8 bit signed mono data */
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371 size_t sndcnv8S_2mono(void **data,size_t *sz,void **outbuf)
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372 {
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373 REGISTER unsigned char *src;
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374 REGISTER unsigned char *dest;
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375 int rc, count;
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376
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377 count = *sz / 2;
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378 if (count > SNDBUFSZ) { *sz -= 2*SNDBUFSZ; count = SNDBUFSZ; }
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379 else *sz = 0;
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380 rc = count;
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381 src = (unsigned char *) *data;
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382 *outbuf =
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383 dest = miscplay_sndbuf;
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384 while (count--)
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385 *dest++ = (unsigned char)(((int)*((signed char *)(src++)) +
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386 (int)*((signed char *)(src++))) / 2);
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|
|
387 *data = src;
|
|
|
388 return(rc);
|
|
|
389 }
|
|
|
390
|
|
|
391 /* Convert 8 bit signed stereo data to 8 bit unsigned mono data */
|
|
|
392 size_t sndcnv2monounsigned(void **data,size_t *sz,void **outbuf)
|
|
|
393 {
|
|
|
394 REGISTER unsigned char *src;
|
|
|
395 REGISTER unsigned char *dest;
|
|
|
396 int rc,count;
|
|
|
397
|
|
|
398 count = *sz / 2;
|
|
|
399 if (count > SNDBUFSZ) { *sz -= 2*SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
400 else *sz = 0;
|
|
|
401 rc = count;
|
|
|
402 src = (unsigned char *) *data;
|
|
|
403 *outbuf =
|
|
|
404 dest = miscplay_sndbuf;
|
|
|
405 while (count--)
|
|
|
406 *dest++ = (unsigned char)(((int)*((signed char *)(src++)) +
|
|
|
407 (int)*((signed char *)(src++))) / 2) ^ 0x80;
|
|
|
408 *data = src;
|
|
|
409 return(rc);
|
|
|
410 }
|
|
|
411
|
|
|
412 /* Convert 8 bit signed mono data to 8 bit unsigned mono data */
|
|
|
413 size_t sndcnv2unsigned(void **data,size_t *sz,void **outbuf)
|
|
|
414 {
|
|
|
415 REGISTER unsigned char *src;
|
|
|
416 REGISTER unsigned char *dest;
|
|
|
417 int rc,count;
|
|
|
418
|
|
|
419 count = *sz;
|
|
|
420 if (count > SNDBUFSZ) { *sz -= SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
421 else *sz = 0;
|
|
|
422 rc = count;
|
|
|
423 src = (unsigned char *) *data;
|
|
|
424 *outbuf =
|
|
|
425 dest = miscplay_sndbuf;
|
|
|
426 while (count--)
|
|
|
427 *dest++ = *(src)++ ^ 0x80;
|
|
|
428 *data = src;
|
|
|
429 return(rc);
|
|
|
430 }
|
|
|
431
|
|
|
432 /* Convert a number in the range -32768..32767 to an 8 bit ulaw encoded
|
|
|
433 number --- I hope, I got this conversion right :-) */
|
|
|
434 static __inline__ signed char int2ulaw(int i)
|
|
|
435 {
|
|
|
436 /* Lookup table for fast calculation of number of bits that need shifting*/
|
|
|
437 static short int t_bits[128] = {
|
|
|
438 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
|
|
|
439 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
|
|
|
440 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
|
|
|
441 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7};
|
|
|
442 REGISTER int bits,logi;
|
|
|
443
|
|
|
444 /* unrolling this condition (hopefully) improves execution speed */
|
|
|
445 if (i < 0) {
|
|
|
446 if ((i = (132-i)) > 0x7FFF) i = 0x7FFF;
|
|
|
447 logi = (i >> ((bits = t_bits[i/256])+4));
|
|
|
448 return((bits << 4 | logi) ^ 0x7F); }
|
|
|
449 else {
|
|
|
450 if ((i = 132+i) > 0x7FFF) i = 0x7FFF;
|
|
|
451 logi = (i >> ((bits = t_bits[i/256])+4));
|
|
|
452 return(~(bits << 4 | logi)); }
|
|
|
453 }
|
|
|
454
|
|
|
455 /* Convert from 8 bit ulaw mono to 8 bit linear mono */
|
|
|
456 size_t sndcnvULaw_2linear(void **data,size_t *sz,void **outbuf)
|
|
|
457 {
|
|
|
458 /* conversion table stolen from Linux's ulaw.h */
|
|
|
459 static unsigned char ulaw_dsp[] = {
|
|
|
460 3, 7, 11, 15, 19, 23, 27, 31,
|
|
|
461 35, 39, 43, 47, 51, 55, 59, 63,
|
|
|
462 66, 68, 70, 72, 74, 76, 78, 80,
|
|
|
463 82, 84, 86, 88, 90, 92, 94, 96,
|
|
|
464 98, 99, 100, 101, 102, 103, 104, 105,
|
|
|
465 106, 107, 108, 109, 110, 111, 112, 113,
|
|
|
466 113, 114, 114, 115, 115, 116, 116, 117,
|
|
|
467 117, 118, 118, 119, 119, 120, 120, 121,
|
|
|
468 121, 121, 122, 122, 122, 122, 123, 123,
|
|
|
469 123, 123, 124, 124, 124, 124, 125, 125,
|
|
|
470 125, 125, 125, 125, 126, 126, 126, 126,
|
|
|
471 126, 126, 126, 126, 127, 127, 127, 127,
|
|
|
472 127, 127, 127, 127, 127, 127, 127, 127,
|
|
|
473 128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
474 128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
475 128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
476 253, 249, 245, 241, 237, 233, 229, 225,
|
|
|
477 221, 217, 213, 209, 205, 201, 197, 193,
|
|
|
478 190, 188, 186, 184, 182, 180, 178, 176,
|
|
|
479 174, 172, 170, 168, 166, 164, 162, 160,
|
|
|
480 158, 157, 156, 155, 154, 153, 152, 151,
|
|
|
481 150, 149, 148, 147, 146, 145, 144, 143,
|
|
|
482 143, 142, 142, 141, 141, 140, 140, 139,
|
|
|
483 139, 138, 138, 137, 137, 136, 136, 135,
|
|
|
484 135, 135, 134, 134, 134, 134, 133, 133,
|
|
|
485 133, 133, 132, 132, 132, 132, 131, 131,
|
|
|
486 131, 131, 131, 131, 130, 130, 130, 130,
|
|
|
487 130, 130, 130, 130, 129, 129, 129, 129,
|
|
|
488 129, 129, 129, 129, 129, 129, 129, 129,
|
|
|
489 128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
490 128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
491 128, 128, 128, 128, 128, 128, 128, 128,
|
|
|
492 };
|
|
|
493 unsigned char *p=(unsigned char *)*data;
|
|
|
494
|
|
|
495 *outbuf = *data;
|
|
|
496 while ((*sz)--)
|
|
|
497 *p++ = ulaw_dsp[*p];
|
|
|
498 *sz = 0;
|
|
|
499 *data = p;
|
|
|
500 return p - (unsigned char *)*outbuf;
|
|
|
501 }
|
|
|
502
|
|
|
503 /* Convert 8 bit ulaw stereo data to 8 bit ulaw mono data */
|
|
|
504 size_t sndcnvULaw_2mono(void **data,size_t *sz,void **outbuf)
|
|
|
505 {
|
|
|
506
|
|
|
507 static short int ulaw2int[256] = {
|
|
|
508 /* Precomputed lookup table for conversion from ulaw to 15 bit signed */
|
|
|
509 -16062,-15550,-15038,-14526,-14014,-13502,-12990,-12478,
|
|
|
510 -11966,-11454,-10942,-10430, -9918, -9406, -8894, -8382,
|
|
|
511 -7998, -7742, -7486, -7230, -6974, -6718, -6462, -6206,
|
|
|
512 -5950, -5694, -5438, -5182, -4926, -4670, -4414, -4158,
|
|
|
513 -3966, -3838, -3710, -3582, -3454, -3326, -3198, -3070,
|
|
|
514 -2942, -2814, -2686, -2558, -2430, -2302, -2174, -2046,
|
|
|
515 -1950, -1886, -1822, -1758, -1694, -1630, -1566, -1502,
|
|
|
516 -1438, -1374, -1310, -1246, -1182, -1118, -1054, -990,
|
|
|
517 -942, -910, -878, -846, -814, -782, -750, -718,
|
|
|
518 -686, -654, -622, -590, -558, -526, -494, -462,
|
|
|
519 -438, -422, -406, -390, -374, -358, -342, -326,
|
|
|
520 -310, -294, -278, -262, -246, -230, -214, -198,
|
|
|
521 -186, -178, -170, -162, -154, -146, -138, -130,
|
|
|
522 -122, -114, -106, -98, -90, -82, -74, -66,
|
|
|
523 -60, -56, -52, -48, -44, -40, -36, -32,
|
|
|
524 -28, -24, -20, -16, -12, -8, -4, +0,
|
|
|
525 +16062,+15550,+15038,+14526,+14014,+13502,+12990,+12478,
|
|
|
526 +11966,+11454,+10942,+10430, +9918, +9406, +8894, +8382,
|
|
|
527 +7998, +7742, +7486, +7230, +6974, +6718, +6462, +6206,
|
|
|
528 +5950, +5694, +5438, +5182, +4926, +4670, +4414, +4158,
|
|
|
529 +3966, +3838, +3710, +3582, +3454, +3326, +3198, +3070,
|
|
|
530 +2942, +2814, +2686, +2558, +2430, +2302, +2174, +2046,
|
|
|
531 +1950, +1886, +1822, +1758, +1694, +1630, +1566, +1502,
|
|
|
532 +1438, +1374, +1310, +1246, +1182, +1118, +1054, +990,
|
|
|
533 +942, +910, +878, +846, +814, +782, +750, +718,
|
|
|
534 +686, +654, +622, +590, +558, +526, +494, +462,
|
|
|
535 +438, +422, +406, +390, +374, +358, +342, +326,
|
|
|
536 +310, +294, +278, +262, +246, +230, +214, +198,
|
|
|
537 +186, +178, +170, +162, +154, +146, +138, +130,
|
|
|
538 +122, +114, +106, +98, +90, +82, +74, +66,
|
|
|
539 +60, +56, +52, +48, +44, +40, +36, +32,
|
|
|
540 +28, +24, +20, +16, +12, +8, +4, +0};
|
|
|
541
|
|
|
542 REGISTER unsigned char *src;
|
|
|
543 REGISTER unsigned char *dest;
|
|
|
544 int rc,count;
|
|
|
545
|
|
|
546 count = *sz / 2;
|
|
|
547 if (count > SNDBUFSZ) { *sz -= 2*SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
548 else *sz = 0;
|
|
|
549 rc = count;
|
|
|
550 src = (unsigned char *) *data;
|
|
|
551 *outbuf =
|
|
|
552 dest = miscplay_sndbuf;
|
|
|
553 while (count--)
|
|
|
554 /* it is not possible to directly interpolate between two ulaw encoded
|
|
|
555 data bytes, thus we need to convert to linear format first and later
|
|
|
556 we convert back to ulaw format */
|
|
|
557 *dest++ = int2ulaw(ulaw2int[*(src)++] +
|
|
|
558 ulaw2int[*(src)++]);
|
|
|
559 *data = src;
|
|
|
560 return(rc);
|
|
|
561 }
|
|
|
562
|
|
|
563 size_t sndcnv16swap(void **data,size_t *sz,void **outbuf)
|
|
|
564 {
|
|
|
565 size_t cnt = *sz / 2;
|
|
|
566 unsigned short *p;
|
|
|
567
|
|
|
568 *outbuf = *data;
|
|
|
569 p = (unsigned short *) *outbuf;
|
|
|
570 while (cnt--) {
|
|
|
571 *p++ = ((*p & 0x00ff) << 8) | (*p >> 8);
|
|
|
572 }
|
|
|
573 *data = p;
|
|
|
574 cnt = *sz;
|
|
|
575 *sz = 0;
|
|
|
576 return cnt;
|
|
|
577 }
|
|
|
578
|
|
|
579 /* Convert 16 bit little endian signed stereo data to 16 bit little endian
|
|
|
580 signed mono data */
|
|
|
581 size_t sndcnv16_2monoLE(void **data,size_t *sz,void **outbuf)
|
|
|
582 {
|
|
|
583 REGISTER unsigned char *src;
|
|
|
584 REGISTER unsigned char *dest;
|
|
|
585 int rc,count;
|
|
|
586 signed short i;
|
|
|
587
|
|
|
588 count = *sz / 2;
|
|
|
589 if (count > SNDBUFSZ) { *sz -= 2*SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
590 else *sz = 0;
|
|
|
591 rc = count;
|
|
|
592 src = (unsigned char *) *data;
|
|
|
593 *outbuf =
|
|
|
594 dest = miscplay_sndbuf;
|
|
|
595 for (count /= 2; count--; ) {
|
|
|
596 i = ((int)(src[0]) +
|
|
|
597 256*(int)(src[1]) +
|
|
|
598 (int)(src[2]) +
|
|
|
599 256*(int)(src[3])) / 2;
|
|
|
600 src += 4;
|
|
|
601 *dest++ = (unsigned char)(i & 0xFF);
|
|
|
602 *dest++ = (unsigned char)((i / 256) & 0xFF); }
|
|
|
603 *data = src;
|
|
|
604 return(rc);
|
|
|
605 }
|
|
|
606
|
|
|
607 /* Convert 16 bit big endian signed stereo data to 16 bit big endian
|
|
|
608 signed mono data */
|
|
|
609 size_t sndcnv16_2monoBE(void **data,size_t *sz,void **outbuf)
|
|
|
610 {
|
|
|
611 REGISTER unsigned char *src;
|
|
|
612 REGISTER unsigned char *dest;
|
|
|
613 int rc,count;
|
|
|
614 signed short i;
|
|
|
615
|
|
|
616 count = *sz / 2;
|
|
|
617 if (count > SNDBUFSZ) { *sz -= 2*SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
618 else *sz = 0;
|
|
|
619 rc = count;
|
|
|
620 src = (unsigned char *) *data;
|
|
|
621 *outbuf =
|
|
|
622 dest = miscplay_sndbuf;
|
|
|
623 for (count /= 2; count--; ) {
|
|
|
624 i = ((int)(src[1]) +
|
|
|
625 256*(int)(src[0]) +
|
|
|
626 (int)(src[3]) +
|
|
|
627 256*(int)(src[2])) / 2;
|
|
|
628 src += 4;
|
|
|
629 *dest++ = (unsigned char)((i / 256) & 0xFF);
|
|
|
630 *dest++ = (unsigned char)(i & 0xFF); }
|
|
|
631 *data = src;
|
|
|
632 return(rc);
|
|
|
633 }
|
|
|
634
|
|
|
635 /* Convert 16 bit little endian signed data to 8 bit unsigned data */
|
|
|
636 size_t sndcnv2byteLE(void **data,size_t *sz,void **outbuf)
|
|
|
637 {
|
|
|
638 REGISTER unsigned char *src;
|
|
|
639 REGISTER unsigned char *dest;
|
|
|
640 int rc,count;
|
|
|
641
|
|
|
642 count = *sz / 2;
|
|
|
643 if (count > SNDBUFSZ) { *sz -= 2*SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
644 else *sz = 0;
|
|
|
645 rc = count;
|
|
|
646 src = (unsigned char *) *data;
|
|
|
647 *outbuf =
|
|
|
648 dest = miscplay_sndbuf;
|
|
|
649 while (count--) {
|
|
|
650 *dest++ = (unsigned char)(((signed char *)src)[1] ^ (signed char)0x80);
|
|
|
651 src += 2;
|
|
|
652 }
|
|
|
653 *data = src;
|
|
|
654 return(rc);
|
|
|
655 }
|
|
|
656
|
|
|
657 /* Convert 16 bit big endian signed data to 8 bit unsigned data */
|
|
|
658 size_t sndcnv2byteBE(void **data,size_t *sz,void **outbuf)
|
|
|
659 {
|
|
|
660 REGISTER unsigned char *src;
|
|
|
661 REGISTER unsigned char *dest;
|
|
|
662 int rc,count;
|
|
|
663
|
|
|
664 count = *sz / 2;
|
|
|
665 if (count > SNDBUFSZ) { *sz -= 2*SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
666 else *sz = 0;
|
|
|
667 rc = count;
|
|
|
668 src = (unsigned char *) *data;
|
|
|
669 *outbuf =
|
|
|
670 dest = miscplay_sndbuf;
|
|
|
671 while (count--) {
|
|
|
672 *dest++ = (unsigned char)(((signed char *)src)[0] ^ (signed char)0x80);
|
|
|
673 src += 2;
|
|
|
674 }
|
|
|
675 *data = src;
|
|
|
676 return(rc);
|
|
|
677 }
|
|
|
678
|
|
|
679 /* Convert 16 bit little endian signed stereo data to 8 bit unsigned
|
|
|
680 mono data */
|
|
|
681 size_t sndcnv2monobyteLE(void **data,size_t *sz,void **outbuf)
|
|
|
682 {
|
|
|
683 REGISTER unsigned char *src;
|
|
|
684 REGISTER unsigned char *dest;
|
|
|
685 int rc,count;
|
|
|
686
|
|
|
687 count = *sz / 4;
|
|
|
688 if (count > SNDBUFSZ) { *sz -= 4*SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
689 else *sz = 0;
|
|
|
690 rc = count;
|
|
|
691 src = (unsigned char *) *data;
|
|
|
692 *outbuf =
|
|
|
693 dest = miscplay_sndbuf;
|
|
|
694 while (count--) {
|
|
|
695 *dest++ = (unsigned char)(((int)((signed char *)src)[1] +
|
|
|
696 (int)((signed char *)src)[3]) / 2 ^ 0x80);
|
|
|
697 src += 4;
|
|
|
698 }
|
|
|
699 *data = src;
|
|
|
700 return(rc);
|
|
|
701 }
|
|
|
702
|
|
|
703 /* Convert 16 bit big endian signed stereo data to 8 bit unsigned
|
|
|
704 mono data */
|
|
|
705 size_t sndcnv2monobyteBE(void **data,size_t *sz,void **outbuf)
|
|
|
706 {
|
|
|
707 REGISTER unsigned char *src;
|
|
|
708 REGISTER unsigned char *dest;
|
|
|
709 int rc,count;
|
|
|
710
|
|
|
711 count = *sz / 4;
|
|
|
712 if (count > SNDBUFSZ) { *sz -= 4*SNDBUFSZ; count = SNDBUFSZ; }
|
|
|
713 else *sz = 0;
|
|
|
714 rc = count;
|
|
|
715 src = (unsigned char *) *data;
|
|
|
716 *outbuf =
|
|
|
717 dest = miscplay_sndbuf;
|
|
|
718 while (count--) {
|
|
|
719 *dest++ = (unsigned char)(((int)((signed char *)src)[0] +
|
|
|
720 (int)((signed char *)src)[2]) / 2 ^ 0x80);
|
|
|
721 src += 4;
|
|
|
722 }
|
|
|
723 *data = src;
|
|
|
724 return(rc);
|
|
|
725 }
|
|
|
726
|
|
|
727 /* Look at the header of the sound file and try to determine the format;
|
|
|
728 we can recognize files in VOC, WAVE, and, Sun/DEC-audio format--- everything
|
|
|
729 else is assumed to be raw 8 bit unsigned data sampled at 8kHz */
|
|
|
730 fmtType analyze_format(unsigned char *format,int *fmt,int *speed,
|
|
|
731 int *tracks,
|
|
|
732 size_t (**parsesndfile)(void **,size_t *sz,
|
|
|
733 void **))
|
|
|
734 {
|
|
|
735 /* Keep compatibility with Linux 68k, etc. by not relying on byte-sex */
|
|
|
736 if (!memcmp(format,"Creative Voice File\x1A\x1A\x00",22) &&
|
|
|
737 (format[22]+256*format[23]) ==
|
|
|
738 ((0x1233-format[24]-256*format[25])&0xFFFF)) { /* VOC */
|
|
|
739 *fmt = AFMT_U8;
|
|
|
740 *speed = 8000;
|
|
|
741 *tracks = 2;
|
|
|
742 *parsesndfile = parsevoc;
|
|
|
743 return(fmtVoc); }
|
|
|
744 else if (!memcmp(format,"RIFF",4) &&
|
|
|
745 !memcmp(format+8,"WAVEfmt ",8)) { /* WAVE */
|
|
|
746 if (memcmp(format+20,"\001\000\001"/* PCM mono */,4) &&
|
|
|
747 memcmp(format+20,"\001\000\002"/* PCM stereo */,4))
|
|
|
748 return(fmtIllegal);
|
|
|
749 *fmt = (format[32]/(*tracks = format[22])) == 1 ?
|
|
|
750 AFMT_U8 : AFMT_S16_LE;
|
|
|
751 /* Keep compatibility with Linux 68k, etc. by not relying on byte-sex */
|
|
|
752 *speed = format[24]+256*(format[25]+256*
|
|
|
753 (format[26]+256*format[27]));
|
|
|
754 *parsesndfile = parsewave;
|
|
|
755 return(fmtWave); }
|
|
|
756 else if (!memcmp(format,".snd",4)) { /* Sun Audio (big endian) */
|
|
|
757 if (format[7]+256*(format[6]+256*(format[5]+256*format[4])) < 24) {
|
|
|
758 *fmt = AFMT_MU_LAW;
|
|
|
759 *speed = 8000;
|
|
|
760 *tracks = 1;
|
|
|
761 *parsesndfile = parsesundecaudio;
|
|
|
762 return(fmtSunAudio); }
|
|
|
763 if (!memcmp(format+12,"\000\000\000\001",4)) *fmt = AFMT_MU_LAW;
|
|
|
764 else if (!memcmp(format+12,"\000\000\000\002",4)) *fmt = AFMT_S8;
|
|
|
765 else if (!memcmp(format+12,"\000\000\000\003",4)) *fmt = AFMT_S16_BE;
|
|
|
766 else return(fmtIllegal);
|
|
|
767 /* Keep compatibility with Linux 68k, etc. by not relying on byte-sex */
|
|
|
768 *speed = format[19]+256*(format[18]+256*
|
|
|
769 (format[17]+256*format[16]));
|
|
|
770 *tracks = format[23];
|
|
|
771 *parsesndfile = parsesundecaudio;
|
|
|
772 return(fmtSunAudio); }
|
|
|
773 else if (!memcmp(format,".sd",4)) { /* DEC Audio (little endian) */
|
|
|
774 if (format[4]+256*(format[5]+256*(format[6]+256*format[7])) < 24) {
|
|
|
775 *fmt = AFMT_MU_LAW;
|
|
|
776 *speed = 8000;
|
|
|
777 *tracks = 1;
|
|
|
778 *parsesndfile = parsesundecaudio;
|
|
|
779 return(fmtSunAudio); }
|
|
|
780 if (!memcmp(format+12,"\001\000\000",4)) *fmt = AFMT_MU_LAW;
|
|
|
781 else if (!memcmp(format+12,"\002\000\000",4)) *fmt = AFMT_S8;
|
|
|
782 else if (!memcmp(format+12,"\003\000\000",4)) *fmt = AFMT_S16_LE;
|
|
|
783 else return(fmtIllegal);
|
|
|
784 /* Keep compatibility with Linux 68k, etc. by not relying on byte-sex */
|
|
|
785 *speed = format[16]+256*(format[17]+256*
|
|
|
786 (format[18]+256*format[19]));
|
|
|
787 *tracks = format[20];
|
|
|
788 *parsesndfile = parsesundecaudio;
|
|
|
789 return(fmtSunAudio); }
|
|
|
790 else {
|
|
|
791 *fmt = AFMT_U8;
|
|
|
792 *speed = 8000;
|
|
|
793 *tracks = 1;
|
|
|
794 *parsesndfile = parseraw;
|
|
|
795 return(fmtRaw); }
|
|
|
796 }
|
