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maint: Update copyright dates.
author John W. Eaton <jwe@octave.org>
date Wed, 22 Feb 2017 12:39:29 -0500
parents 6763f91685da
children 092078913d54
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23219
3ac9f9ecfae5 maint: Update copyright dates.
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1 ## Copyright (C) 2013-2017 Vytautas Jančauskas
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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 {} {@var{player} =} audioplayer (@var{y}, @var{fs})
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21 ## @deftypefnx {} {@var{player} =} audioplayer (@var{y}, @var{fs}, @var{nbits})
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22 ## @deftypefnx {} {@var{player} =} audioplayer (@var{y}, @var{fs}, @var{nbits}, @var{id})
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23 ## @deftypefnx {} {@var{player} =} audioplayer (@var{recorder})
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24 ## @deftypefnx {} {@var{player} =} audioplayer (@var{recorder}, @var{id})
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25 ## Create an audioplayer object that will play back data @var{y} at sample
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26 ## rate @var{fs}.
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27 ##
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28 ## The optional arguments @var{nbits}, and @var{id} specify the bit depth and
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29 ## player device id, respectively. Device IDs may be found using the
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30 ## audiodevinfo function. Given an audioplayer object, use the data from the
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31 ## object to initialize the player.
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32 ##
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33 ## The signal @var{y} can be a vector or a two-dimensional array.
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34 ##
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35 ## The following example will create an audioplayer object that will play
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36 ## back one second of white noise at 44100 sample rate using 8 bits per
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37 ## sample.
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38 ##
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39 ## @example
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40 ## @group
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41 ## y = 0.25 * randn (2, 44100);
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42 ## player = audioplayer (y, 44100, 8);
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43 ## play (player);
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44 ## @end group
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45 ## @end example
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46 ## @end deftypefn
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47
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48 ## FIXME: callbacks don't work properly, apparently because portaudio
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49 ## will execute the callbacks in a separate thread, and calling Octave
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50 ## functions in a separate thread which is likely to cause trouble with
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51 ## all of Octave's global data...
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52 ##
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53 ## @deftypefnx {} {@var{player} =} audioplayer (@var{function}, @dots{})
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54 ##
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55 ## Given a function handle, use that function to process the audio.
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56 #
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57 ## The following example will create and register a callback that generates
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58 ## a sine wave on both channels.
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59 ##
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60 ## @example
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61 ## @group
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62 ## function [ sound, status ] = callback_sine (frames)
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63 ## global lphase = 0.0;
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64 ## global rphase = 0.0;
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65 ## incl = 440.0 / 44100.0;
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66 ## incr = 443.0 / 44100.0;
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67 ## nl = incl * frames;
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68 ## nr = incr * frames;
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69 ## left = sin (2.0 * pi * [lphase:incl:lphase+nl]);
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70 ## right = sin (2.0 * pi * [rphase:incr:rphase+nr]);
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71 ## sound = [left', right'];
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72 ## status = 0;
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73 ## lphase = lphase + nl;
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74 ## rphase = rphase + nr;
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75 ## endfunction
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76 ## player = audioplayer (@@callback_sine, 44100);
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77 ## play (player);
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78 ## # play for as long as you want
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79 ## stop (player);
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80 ## @end group
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81
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82 function player = audioplayer (varargin)
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83
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84 if (nargin < 1 || nargin > 4
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85 || (nargin < 2 && ! (is_function_handle (varargin{1})
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86 || ischar (varargin{1}))))
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87 print_usage ();
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88 endif
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89
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90 if (isa (varargin{1}, "audiorecorder"))
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91 if (nargin == 1)
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92 player = getplayer (varargin{1});
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93 elseif (nargin == 2)
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94 recorder = varargin{1};
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95 data = getaudiodata (recorder);
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96 player = audioplayer (data, get (recorder, "SampleRate"),
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97 get (recorder, "BitsPerSample"), varargin{2});
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98 else
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99 print_usage ();
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100 endif
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101 else
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102 if (ischar (varargin{1}))
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103 varargin{1} = str2func (varargin{1});
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104 endif
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105 player.player = __player_audioplayer__ (varargin{:});
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106 player = class (player, "audioplayer");
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107 endif
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108
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109 endfunction
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110
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111
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112 %!demo
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113 %! fs = 44100;
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114 %! audio = 0.25 * randn (2, 2*fs);
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115 %! player = audioplayer (audio, fs);
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116 %! play (player);
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117 %! pause (1);
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118 %! pause (player);
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119 %! pause (1);
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120 %! resume (player);
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121 %! pause (1);
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122 %! stop (player);
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123
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124 ## Tests of audioplayer must not actually play anything.
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125
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126 %!testif HAVE_PORTAUDIO
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127 %! mono = 0.25 * randn (1, 44100);
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128 %! stereo = 0.25 * randn (2, 44100);
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129 %! fs = 44100;
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130 %! player1 = audioplayer (mono, fs);
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131 %! player2 = audioplayer (stereo, fs);
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132 %! assert (player1.NumberOfChannels, 1);
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133 %! assert (player2.NumberOfChannels, 2);
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134 %! assert (player1.SampleRate, 44100);
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135 %! assert (player2.SampleRate, 44100);
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136 %! assert (player1.TotalSamples, 44100);
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137 %! assert (player2.TotalSamples, 44100);
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138
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139 %!testif HAVE_PORTAUDIO
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140 %! audio = 0.25 * randn (2, 44100);
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141 %! fs = 44100;
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142 %! player = audioplayer (audio, fs);
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143 %! set (player, {"SampleRate", "Tag", "UserData"}, {8000, "tag", [1, 2; 3, 4]});
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144 %! assert (player.SampleRate, 8000);
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145 %! assert (player.Tag, "tag");
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146 %! assert (player.UserData, [1, 2; 3, 4]);
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147
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148 %!testif HAVE_PORTAUDIO
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149 %! audio = 0.25 * randn (2, 44100);
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150 %! fs = 44100;
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151 %! player = audioplayer (audio, fs);
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152 %! settable = set (player);
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153 %! settable.SampleRate = 8000;
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154 %! settable.Tag = "tag";
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155 %! settable.UserData = [1, 2; 3, 4];
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156 %! set (player, settable);
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157 %! assert (player.SampleRate, 8000);
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158 %! assert (player.Tag, "tag");
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159 %! assert (player.UserData, [1, 2; 3, 4]);
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160
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161 %!testif HAVE_PORTAUDIO
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162 %! audio = 0.25 * randn (2, 44100);
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163 %! fs = 44100;
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164 %! player = audioplayer (audio, fs);
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165 %! player.SampleRate = 8000;
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166 %! player.Tag = "tag";
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167 %! player.UserData = [1, 2; 3, 4];
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168 %! properties = get (player, {"SampleRate", "Tag", "UserData"});
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169 %! assert (properties, {8000, "tag", [1, 2; 3, 4]});
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170
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171 #%!function [sound, status] = callback (samples)
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172 #%! sound = rand (samples, 2) - 0.5;
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173 #%! status = 0;
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174 #%!endfunction
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175
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176 #%!testif HAVE_PORTAUDIO
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177 #%! player = audioplayer (@callback, 44100);
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178 #%! play (player);
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179 #%! pause (2);
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180 #%! stop (player);
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181 #%! assert (1);
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182
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183 #%!testif HAVE_PORTAUDIO
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184 #%! player = audioplayer ("callback", 44100, 16);
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185 #%! play (player);
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186 #%! pause (2);
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187 #%! stop (player);
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188 #%! assert (1);