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von raredesign | Dez 3, 2019 | Allgemein | 0 Kommentare
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<div class="title">ALSAAudioDevice.cxx</div> </div>
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<a href="ALSAAudioDevice_8cxx.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * UNIVERSITAT POMPEU FABRA</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * This program is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * the Free Software Foundation; either version 2 of the License, or</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * (at your option) any later version.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * This program is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * GNU General Public License for more details.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * You should have received a copy of the GNU General Public License</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * along with this program; if not, write to the Free Software</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include "<a class="code" href="SndPcm_8hxx.html">SndPcm.hxx</a>"</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "<a class="code" href="AudioIO_8hxx.html">AudioIO.hxx</a>"</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "<a class="code" href="AudioIn_8hxx.html">AudioIn.hxx</a>"</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "<a class="code" href="AudioOut_8hxx.html">AudioOut.hxx</a>"</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include "<a class="code" href="AudioDeviceList_8hxx.html">AudioDeviceList.hxx</a>"</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include "<a class="code" href="AudioDevice_8hxx.html">AudioDevice.hxx</a>"</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <sstream></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">namespace </span>CLAM {</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">class </span>ALSAAudioDevice: <span class="keyword">public</span> AudioDevice</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  {</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">private</span>:</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">int</span> mNChannelsWritten;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">bool</span> mChannelsWritten[256];</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordtype">int</span> mNChannelsRead;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordtype">bool</span> mChannelsRead[256];</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordtype">int</span> mWriteBufSize;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  Array<short> mWriteBuf;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">int</span> mReadBufSize;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  Array<short> mReadBuf;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <a class="code" href="classSndPcm.html">SndPcm</a>* mSndpcm;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  std::string mDevice;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordtype">int</span> HighestChannelID();</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  ALSAAudioDevice(<span class="keyword">const</span> std::string& name,<span class="keyword">const</span> std::string& device);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  ~ALSAAudioDevice();</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordtype">void</span> Start(<span class="keywordtype">void</span>) throw(Err);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordtype">void</span> Stop(<span class="keywordtype">void</span>) throw(Err);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">void</span> Read(Audio& audio,const <span class="keywordtype">int</span> channelID);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">void</span> Write(const Audio& audio,const <span class="keywordtype">int</span> channelID);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  };</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  ALSAAudioDevice::ALSAAudioDevice(const std::<span class="keywordtype">string</span>& name,const std::<span class="keywordtype">string</span>& device): </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  AudioDevice(name), </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  mSndpcm(0)</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">//printf("ALSAAudioDevice::ALSAAudioDevice\n");</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  mNChannelsWritten = 0;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">for</span> (i=0;i<256;i++)</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  mChannelsWritten[i] = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  mNChannelsRead = 0;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">for</span> (i=0;i<256;i++)</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  mChannelsRead[i] = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  mDevice = device;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordtype">int</span> ALSAAudioDevice::HighestChannelID(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">int</span> max_id = 0;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  std::vector<AudioIn*>::const_iterator in_it;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">for</span> (in_it = <a class="code" href="classCLAM_1_1AudioDevice.html#aa0a35c3c0f1b99582f9696d92e4f3bf4">mInputs</a>.begin(); in_it != <a class="code" href="classCLAM_1_1AudioDevice.html#aa0a35c3c0f1b99582f9696d92e4f3bf4">mInputs</a>.end(); in_it++)</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> ( (*in_it)->GetChannelID() > max_id)</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  max_id = (*in_it)->GetChannelID();</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  }</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  std::vector<AudioOut*>::const_iterator out_it;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">for</span> (out_it = <a class="code" href="classCLAM_1_1AudioDevice.html#a688a8c9b7fd6d4d62283a9b8a21282a1">mOutputs</a>.begin(); out_it != <a class="code" href="classCLAM_1_1AudioDevice.html#a688a8c9b7fd6d4d62283a9b8a21282a1">mOutputs</a>.end(); out_it++)</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  {</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> ( (*out_it)->GetChannelID() > max_id)</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  max_id = (*out_it)->GetChannelID();</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  }</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">return</span> max_id;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordtype">void</span> ALSAAudioDevice::Start(<span class="keywordtype">void</span>) throw(Err)</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  {</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">bool</span> needs_start = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <a class="code" href="classCLAM_1_1AudioDevice.html#a2d7ac972f898b2ff3fdd4a7335f145d3">mNReadChannels</a> = <a class="code" href="classCLAM_1_1AudioDevice.html#aa0a35c3c0f1b99582f9696d92e4f3bf4">mInputs</a>.size();</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <a class="code" href="classCLAM_1_1AudioDevice.html#af4178ba8b6049feb3e4c72d210b1317e">mNWriteChannels</a> = <a class="code" href="classCLAM_1_1AudioDevice.html#a688a8c9b7fd6d4d62283a9b8a21282a1">mOutputs</a>.size();</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">if</span> (mForceNChannels)</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  {</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordtype">int</span> used_channels = HighestChannelID() + 1;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">if</span> (used_channels > mNChannels)</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">throw</span> Err(<span class="stringliteral">"ALSAAudioDevice::Start(): more inputs or outputs than requested channels."</span>);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  }</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">if</span> ( HighestChannelID() + 1 != mNChannels)</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span> (mSndpcm) {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  mSndpcm->Stop();</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keyword">delete</span> mSndpcm;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  mSndpcm = 0;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  }</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <a class="code" href="classCLAM_1_1AudioDevice.html#abdbaac6f077d96b8edf0de3dd4384998">mNChannels</a> = HighestChannelID() + 1;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">if</span> (mSndpcm==0)</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">try</span> {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  mSndpcm = new ::SndPcm(<a class="code" href="classCLAM_1_1AudioDevice.html#af6a7ea24eda198e86293eedcb8a5cf41">SampleRate</a>(),mNReadChannels,mNWriteChannels,<a class="code" href="classCLAM_1_1AudioDevice.html#aef78c6cbeab909b40c50e174e5c84012">Latency</a>(),mDevice.c_str(),mDevice.c_str());</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">catch</span> (<a class="code" href="classSndPcmError.html">SndPcmError</a> &e) {</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  Err ne(<span class="stringliteral">"ALSAAudioDevice::Start(): Failed to create PCM device."</span>);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  ne.Embed(e);</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">throw</span>(ne);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  needs_start = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordtype">int</span> bufSize = mSndpcm->latency * <a class="code" href="classCLAM_1_1AudioDevice.html#abdbaac6f077d96b8edf0de3dd4384998">mNChannels</a>;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  mReadBuf.Resize(bufSize);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  mWriteBuf.Resize(bufSize);</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  mReadBuf.SetSize(bufSize);</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  mWriteBuf.SetSize(bufSize);</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">for</span> (i=0; i<bufSize; i++) {</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  mReadBuf[i] = 0;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  mWriteBuf[i] = 0;</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="comment">// the following settings will be set at the first Read/Write</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">// to the Audio buffer size that is passed.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  mReadBufSize = 0; </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  mWriteBufSize = 0;</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">if</span> (needs_start)</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  mSndpcm->Start();</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  }</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordtype">void</span> ALSAAudioDevice::Stop(<span class="keywordtype">void</span>) throw(Err)</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  {</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="comment">//printf("ALSAAudioDevice::Stop\n");</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">if</span> (mSndpcm) {</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  mSndpcm->Stop();</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  }</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  }</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  ALSAAudioDevice::~ALSAAudioDevice()</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  {</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="comment">//printf("ALSAAudioDevice::~ALSAAudioDevice\n");</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  Stop();</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">if</span> (mSndpcm) {</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keyword">delete</span> mSndpcm;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  }</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  }</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordtype">void</span> ALSAAudioDevice::Read(Audio& audio,<span class="keyword">const</span> <span class="keywordtype">int</span> channelID)</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  {</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <a class="code" href="Assert_8hxx.html#a74510ab691cb933dbe30c4943651ba1d">CLAM_DEBUG_ASSERT</a>(channelID < mNChannels,</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="stringliteral">"ALSAAudioDevice::Read(): Invalid Channel ID"</span>);</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <a class="code" href="namespaceCLAM.html#ab9c6321b061069797fcc173f61e8111a">TData</a>* ptrA = audio.GetBuffer().GetPtr();</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordtype">short</span>* ptrB = mReadBuf.GetPtr() + channelID;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordtype">int</span> n;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">if</span> (mChannelsRead[channelID]) </div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordflow">throw</span> Err(<span class="stringliteral">"ALSAAudioDevice::Read(): Tried to read "</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="stringliteral">"twice from a channel in a single time frame!"</span>);</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordflow">if</span> (!mSndpcm)</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keywordflow">throw</span> Err(<span class="stringliteral">"ALSAAudioDevice::Read(): Device not configured."</span>);</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  </div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">if</span> (mReadBufSize==0) mReadBufSize=audio.GetSize();</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordflow">else</span>{</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <a class="code" href="Assert_8hxx.html#a0013fa617be6fec21a9ad7180e7d8cff" title="An assertion is a check on an expression that must be true given that all the contracts are fullfille...">CLAM_ASSERT</a>(mReadBufSize==audio.GetSize(),<span class="stringliteral">"ALSADevice: Inconsistent Audio size"</span>);</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  }</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">if</span> (mReadBufSize>mSndpcm->latency) </div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">throw</span> Err(<span class="stringliteral">"You are trying to read audio in blocks bigger than the latency"</span>);</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  </div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">if</span> (mNChannelsRead == 0)</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  {</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  mSndpcm->Poll();</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  mSndpcm->ReadBuf(mReadBuf.GetPtr(),mReadBufSize);</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  n = mReadBufSize;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordflow">while</span> (n--)</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  {</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  *ptrA++ = <a class="code" href="namespaceCLAM.html#ab9c6321b061069797fcc173f61e8111a">TData</a>(*ptrB) / 32767.;</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  ptrB += <a class="code" href="classCLAM_1_1AudioDevice.html#abdbaac6f077d96b8edf0de3dd4384998">mNChannels</a>;</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  }</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  </div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  mChannelsRead[channelID] = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  mNChannelsRead++;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">if</span> (mNChannelsRead==mNReadChannels)</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  {</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  mNChannelsRead = 0;</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=0;i<<a class="code" href="classCLAM_1_1AudioDevice.html#abdbaac6f077d96b8edf0de3dd4384998">mNChannels</a>;i++)</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  mChannelsRead[i] = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  }</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  }</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordtype">void</span> ALSAAudioDevice::Write(<span class="keyword">const</span> Audio& audio,<span class="keyword">const</span> <span class="keywordtype">int</span> channelID)</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  {</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <a class="code" href="Assert_8hxx.html#a74510ab691cb933dbe30c4943651ba1d">CLAM_DEBUG_ASSERT</a>(channelID < mNChannels,</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="stringliteral">"ALSAAudioDevice::Write(): Invalid Channel ID"</span>);</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> </div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <a class="code" href="namespaceCLAM.html#ab9c6321b061069797fcc173f61e8111a">TData</a>* ptrA = audio.GetBuffer().GetPtr();</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordtype">short</span>* ptrB = mWriteBuf.GetPtr() + channelID;</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keywordtype">int</span> i,n;</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="comment">//printf("alsaauduiodevice write. audio size: %d mWriteBufSize: %d\n", audio.GetSize(), mWriteBufSize);</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">if</span> (mWriteBufSize==0) mWriteBufSize=audio.GetSize();</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordflow">else</span>{</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <a class="code" href="Assert_8hxx.html#a0013fa617be6fec21a9ad7180e7d8cff" title="An assertion is a check on an expression that must be true given that all the contracts are fullfille...">CLAM_ASSERT</a>(mWriteBufSize==audio.GetSize(),<span class="stringliteral">"ALSADevice Write: Inconsistent Audio size"</span>);</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  }</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  </div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keywordflow">if</span> (mWriteBufSize>mSndpcm->latency) </div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">throw</span> Err(<span class="stringliteral">"You are trying to write audio in blocks bigger than the latency"</span>);</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordflow">if</span> (mChannelsWritten[channelID])</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">throw</span> Err(<span class="stringliteral">"ALSAAudioDevice::Write(): Tried to write "</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="stringliteral">"twice into a channel in a single time frame."</span>);</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">if</span> (!mSndpcm)</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordflow">throw</span> Err(<span class="stringliteral">"ALSAAudioDevice::Write(): Device not configured."</span>);</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  n = mWriteBufSize;</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">while</span> (n--)</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  {</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  *ptrB = (short) (32767.*(*ptrA++));</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  ptrB += <a class="code" href="classCLAM_1_1AudioDevice.html#abdbaac6f077d96b8edf0de3dd4384998">mNChannels</a>;</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  }</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> </div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  mChannelsWritten[channelID] = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  mNChannelsWritten++;</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keywordflow">if</span> (mNChannelsWritten==mNWriteChannels)</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  {</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keywordflow">if</span> (mNReadChannels==0) mSndpcm->Poll();</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  mSndpcm->WriteBuf(mWriteBuf.GetPtr(),mWriteBufSize);</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  </div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  mNChannelsWritten = 0;</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keywordflow">for</span> (i=0;i<<a class="code" href="classCLAM_1_1AudioDevice.html#abdbaac6f077d96b8edf0de3dd4384998">mNChannels</a>;i++)</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  mChannelsWritten[i] = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  }</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  }</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> </div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keyword">class </span>ALSAAudioDeviceList: <span class="keyword">public</span> AudioDeviceList</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  {</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keyword">static</span> ALSAAudioDeviceList sDevices;</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> </div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  ALSAAudioDeviceList()</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  :AudioDeviceList(std::string(<span class="stringliteral">"alsa"</span>))</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  {</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keywordtype">int</span> card, dev;</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  snd_ctl_t *handle;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  snd_ctl_card_info_t *info;</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> </div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  snd_ctl_card_info_alloca(&info);</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  card = -1;</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordflow">if</span> (snd_card_next(&card) < 0 || card < 0)</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">return</span>; <span class="comment">// No cards found</span></div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="keywordflow">while</span> (card >= 0) {</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  std::stringstream namestr;</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  namestr << <span class="stringliteral">"hw:"</span> << card;</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  std::string name(namestr.str());</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordflow">if</span> (snd_ctl_open(&handle, name.c_str(), 0) < 0)</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="keywordflow">continue</span>; <span class="comment">// Card control open error!</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keywordflow">if</span> (snd_ctl_card_info(handle, info) < 0) {</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  snd_ctl_close(handle); <span class="comment">// Card control read error!</span></div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  }</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  dev = -1;</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">while</span> (1) {</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  snd_ctl_pcm_next_device(handle, &dev);</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="keywordflow">if</span> (dev < 0)</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  std::stringstream dnamestr;</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  dnamestr << name << <span class="stringliteral">","</span> << dev;</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  std::string dname(dnamestr.str());</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  mAvailableDevices.push_back(dname.c_str());</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> </div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  std::stringstream plug;</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  plug << <span class="stringliteral">"plug"</span> << dname;</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  mAvailableDevices.push_back(plug.str());</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  }</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  snd_ctl_close(handle);</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keywordflow">if</span> (snd_card_next(&card) < 0)</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  }</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  </div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  AddMe();</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  }</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> </div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  std::string DefaultDevice(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  {</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="keywordflow">return</span> <span class="stringliteral">"plughw:0,0"</span>;</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  }</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> </div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  AudioDevice* Create(</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <span class="keyword">const</span> std::string& name,<span class="keyword">const</span> std::string& device)</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  {</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="keywordflow">return</span> <span class="keyword">new</span> ALSAAudioDevice(name,device);</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  }</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  };</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> </div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  ALSAAudioDeviceList ALSAAudioDeviceList::sDevices;</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> }</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> </div>
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