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1 ## Copyright (C) 2005, 2006, 2007 Michael Zeising |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## 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 ## 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 General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} wavwrite (@var{y}, @var{filename}) |
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21 ## @deftypefnx {Function File} {} wavwrite (@var{y}, @var{fs}, @var{filename}) |
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22 ## @deftypefnx {Function File} {} wavwrite (@var{y}, @var{fs}, @var{bits}, @var{filename}) |
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23 ## Write @var{y} to the canonical RIFF/WAVE sound file @var{filename} |
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24 ## with sample rate @var{fs} and bits per sample @var{bits}. The |
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25 ## default sample rate is 8000 Hz with 16-bits per sample. Each column |
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26 ## of the data represents a separate channel. |
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27 ## @seealso{wavread} |
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28 ## @end deftypefn |
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29 |
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30 ## Author: Michael Zeising <michael.zeising@stud.uni-erlangen.de> |
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31 ## Created: 06 December 2005 |
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32 |
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33 function wavwrite (y, varargin) |
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34 |
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35 BYTEORDER = "ieee-le"; |
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36 |
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37 ## For backward compatibility with previous versions of Octave, also |
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38 ## accept the inputs |
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39 ## |
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40 ## wavwrite (filename, y) |
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41 ## wavwrite (filename, y, fs) |
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42 ## wavwrite (filename, y, fs, bits) |
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43 |
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44 if (nargin < 2 || nargin > 4) |
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45 print_usage (); |
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46 endif |
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47 |
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48 ## Defaults. |
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49 samples_per_sec = 8000; |
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50 bits_per_sample = 16; |
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51 |
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52 if (ischar (y)) |
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53 filename = y; |
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54 y = varargin{1}; |
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55 if (nargin > 2) |
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56 samples_per_sec = varargin{2}; |
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57 if (nargin > 3) |
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58 bits_per_sample = varargin{3}; |
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59 endif |
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60 endif |
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61 else |
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62 filename = varargin{end}; |
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63 if (nargin > 2) |
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64 samples_per_sec = varargin{1}; |
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65 if (nargin > 3) |
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66 bits_per_sample = varargin{2}; |
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67 endif |
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68 endif |
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69 endif |
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70 |
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71 ## test arguments |
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72 if (columns (y) < 1) |
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73 error ("wavwrite: Y must have at least one column"); |
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74 endif |
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75 if (columns (y) > 2^15-1) |
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76 error ("wavwrite: Y has more than 32767 columns (too many for a WAV-file)"); |
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77 endif |
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78 |
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79 ## determine sample format |
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80 switch (bits_per_sample) |
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81 case 8 |
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82 format = "uint8"; |
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83 case 16 |
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84 format = "int16"; |
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85 case 32 |
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86 format = "int32"; |
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87 otherwise |
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88 error ("wavwrite: sample resolution not supported"); |
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89 endswitch |
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90 |
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91 ## calculate filesize |
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92 [n, channels] = size(y); |
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93 |
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94 ## size of data chunk |
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95 ck_size = n*channels*(bits_per_sample/8); |
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96 |
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97 ## open file for writing binary |
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98 |
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99 if (! ischar (filename)) |
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100 error ("wavwrite: expecting filename to be a character string"); |
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101 endif |
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102 |
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103 [fid, msg] = fopen (filename, "wb"); |
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104 if (fid < 0) |
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105 error ("wavwrite: %s", msg) |
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106 endif |
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107 |
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108 ## write RIFF/WAVE header |
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109 c = 0; |
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110 c += fwrite (fid, "RIFF", "uchar"); |
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111 |
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112 ## file size - 8 |
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113 c += fwrite (fid, ck_size + 36, "uint32", 0, BYTEORDER); |
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114 c += fwrite (fid, "WAVEfmt ", "uchar"); |
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115 |
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116 ## size of fmt chunk |
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117 c += fwrite (fid, 16, "uint32", 0, BYTEORDER); |
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118 |
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119 ## sample format code (PCM) |
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120 c += fwrite (fid, 1, "uint16", 0, BYTEORDER); |
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121 |
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122 ## channels |
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123 c += fwrite (fid, channels, "uint16", 0, BYTEORDER); |
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124 |
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125 ## sample rate |
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126 c += fwrite (fid, samples_per_sec, "uint32", 0, BYTEORDER); |
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127 |
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128 ## bytes per second |
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129 bps = samples_per_sec*channels*bits_per_sample/8; |
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130 c += fwrite (fid, bps, "uint32", 0, BYTEORDER); |
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131 |
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132 ## block align |
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133 c += fwrite (fid, channels*bits_per_sample/8, "uint16", 0, BYTEORDER); |
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134 |
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135 c += fwrite (fid, bits_per_sample, "uint16", 0, BYTEORDER); |
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136 c += fwrite (fid, "data", "uchar"); |
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137 c += fwrite (fid, ck_size, "uint32", 0, BYTEORDER); |
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138 |
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139 if (c < 25) |
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140 fclose (fid); |
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141 error ("wavwrite: writing to file failed"); |
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142 endif |
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143 |
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144 ## interleave samples |
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145 yi = reshape (y', n*channels, 1); |
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146 |
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147 ## scale samples |
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148 switch (bits_per_sample) |
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149 case 8 |
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150 yi = round (yi*128 + 128); |
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151 case 16 |
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152 yi = round (yi*32768); |
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153 case 32 |
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154 yi = round (yi*2147483648); |
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155 endswitch |
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156 |
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157 ## write to file |
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158 c = fwrite (fid, yi, format, 0, BYTEORDER); |
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159 |
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160 fclose (fid); |
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161 |
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162 endfunction |
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163 |
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164 %!test |
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165 %! A = [1:10; 1:10]/10; |
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166 %! wavwrite("a.wav", A); |
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167 %! [B, samples_per_sec, bits_per_sample] = wavread("a.wav"); |
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168 %! assert(A,B, 10^(-4)); |
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169 %! assert(samples_per_sec, 8000); |
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170 %! assert(bits_per_sample, 16); |
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171 % |
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172 %!test |
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173 %! A=[1:10; 1:10] / 10; |
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174 %! wavwrite("a.wav", A, 4000); |
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175 %! [B, samples_per_sec, bits_per_sample] = wavread("a.wav"); |
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176 %! assert(A,B, 10^(-4)); |
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177 %! assert(samples_per_sec, 4000); |
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178 %! assert(bits_per_sample, 16); |
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179 % |
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180 %!test |
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181 %! A=[1:10; 1:10] / 10; |
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182 %! wavwrite("a.wav", A, 4000, 8); |
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183 %! [B, samples_per_sec, bits_per_sample] = wavread("a.wav"); |
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184 %! assert(A,B, 10^(-2)); |
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185 %! assert(samples_per_sec, 4000); |
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186 %! assert(bits_per_sample, 8); |
