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von raredesign | Dez 3, 2019 | Allgemein | 0 Kommentare
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<a href="MIDIWriter_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="preprocessor">#include "<a class="code" href="MIDITrack_8hxx.html">MIDITrack.hxx</a>"</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#include "<a class="code" href="MIDISong_8hxx.html">MIDISong.hxx</a>"</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor">#include "<a class="code" href="MIDIWriter_8hxx.html">MIDIWriter.hxx</a>"</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="keyword">namespace </span>MIDI</div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> {</div>
<div class="line"><a name="l00007"></a><span class="lineno"><a class="code" href="classMIDI_1_1Writer.html#afe42bf3bd7720601ce7f0bc7b58910e5"> 7</a></span>  <a class="code" href="classMIDI_1_1Writer.html#afe42bf3bd7720601ce7f0bc7b58910e5">Writer::Writer</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* filename)</div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  : mFile(0)</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  , mBytesWritten(0)</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  {</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  mFile = fopen(filename,<span class="stringliteral">"wb"</span>);</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  }</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
<div class="line"><a name="l00014"></a><span class="lineno"><a class="code" href="classMIDI_1_1Writer.html#a5f9ba540ae581d3b55090fe3a36a0074"> 14</a></span>  <a class="code" href="classMIDI_1_1Writer.html#a5f9ba540ae581d3b55090fe3a36a0074">Writer::~Writer</a>()</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  {</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  }</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div>
<div class="line"><a name="l00018"></a><span class="lineno"><a class="code" href="classMIDI_1_1Writer.html#a8d0292f3c901b0d31e299cea777a6a09"> 18</a></span>  <span class="keywordtype">void</span> <a class="code" href="classMIDI_1_1Writer.html#a8d0292f3c901b0d31e299cea777a6a09">Writer::Write</a>(<a class="code" href="classMIDI_1_1Song.html">Song</a>& s)</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  {</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordflow">if</span>(!mFile) <span class="keywordflow">return</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="keyword">static</span> <span class="keywordtype">int</span> nbytesPerChnMsg[7] = { 3,3,3,3,2,3,3 };</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  mTracks = s.<a class="code" href="classMIDI_1_1Song.html#a2d9893df77494147fb3fb8615eac5772">Tracks</a>();</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  mFormat = (mTracks > 1) ? 1 : 0;</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  mDivision = (<a class="code" href="classint.html">int</a>)s.<a class="code" href="classMIDI_1_1Song.html#a16f7c06f9a40a739158c7aa7dc0b091a">GetTicksPerQ</a>();</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  WriteHeader();</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="keywordtype">unsigned</span> <span class="keywordtype">long</span> trkhdr=<a class="code" href="MIDIWriter_8hxx.html#ab5134490145d2b39a728cbddcb42b3bc">MTrk</a>;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordtype">long</span> offset,endt;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordtype">unsigned</span> t0,t1;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0; i < mTracks; i++)</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  {</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">// write track header</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  Write32Bit(trkhdr);</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="comment">// remember position</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  offset = ftell(mFile);</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  Write32Bit(0);</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  mBytesWritten=0;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  t0=t1=0;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <a class="code" href="classMIDI_1_1Track.html">Track</a>* track = s.<a class="code" href="classMIDI_1_1Song.html#a8b5bf1ed13c63b6894d4e07600bbf72d">GetTrack</a>(i);</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <a class="code" href="classMIDI_1_1Track.html#a099d0530f9c2f7292dba4cf3785bc55f">Track::EventIterator</a> it = track-><a class="code" href="classMIDI_1_1Track.html#ae95b19922bcebc98a998a0fbd54aaf8c">Begin</a>();</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">for</span>(;it != track-><a class="code" href="classMIDI_1_1Track.html#a8ca544c5694e2cad55d0407835f4412a">End</a>(); it++)</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  {</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">const</span> <a class="code" href="classMIDI_1_1Event.html">Event</a> &ev = **it;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  t1=(<a class="code" href="classunsigned.html">unsigned</a>)ev.<a class="code" href="classMIDI_1_1Event.html#abd597058f89283ce6d9ce12386bb2a43">GetTicks</a>();</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordtype">int</span> type = ((ev[0]&0xF0)>>4)-8;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span>(type==7)</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  {</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">if</span>(ev[0]==0xFF && ev[1]==0x51)</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// write tempo information</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  WriteVarLen(t1-t0);</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  WriteCh(0xFF);</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  WriteCh(0x51);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  WriteCh(0x03);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <a class="code" href="classMIDI_1_1MetaEvent.html">MetaEvent</a>* e = (<a class="code" href="classMIDI_1_1MetaEvent.html">MetaEvent</a>*)*it;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> k=0; k < 3; k++)</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>  WriteCh(e-><a class="code" href="classMIDI_1_1MetaEvent.html#a505b1c20c90076b9fe481c2a8bcce5a1">mData</a>[k]);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  }</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  }</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  WriteVarLen(t1-t0); <span class="comment">// write delta time</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">int</span> msglen = nbytesPerChnMsg[type];</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> j=0; j < msglen; j++) </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  WriteCh((<span class="keywordtype">char</span>)ev[j]);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</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>  t0=t1;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  </div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// write end of track</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  WriteCh(0);</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  WriteCh((<span class="keywordtype">unsigned</span>)0xFF);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  WriteCh((<span class="keywordtype">unsigned</span>)0x2f);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  WriteCh(0);</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  endt = ftell(mFile);</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  fseek(mFile,offset,0);</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">// write track length</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  Write32Bit(mBytesWritten);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">// retrieve position</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  fseek(mFile,endt,0);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  fclose(mFile);</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>  <span class="keywordtype">void</span> Writer::WriteHeader()</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">id</span>=<a class="code" href="MIDIWriter_8hxx.html#a276e4840e6cdaff55b54b8b50457696f">MThd</a>;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  </div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  Write32Bit(<span class="keywordtype">id</span>); <span class="comment">// MThd </span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  Write32Bit(6); <span class="comment">// header length = 6</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  Write16Bit(mFormat); <span class="comment">// format </span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  Write16Bit(mTracks); <span class="comment">// ntracks </span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  Write16Bit(mDivision); <span class="comment">// division</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> Writer::WriteVarLen(<span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> value)</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="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> buffer;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  buffer = value & 0x7F;</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>  <span class="keywordflow">while</span>( (value >>= 7) )</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  buffer <<= 8;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  buffer |= ((value & 0x7F) | 0x80);</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> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">while</span>(1)</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  {</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  WriteCh(buffer);</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">if</span> (buffer & 0x80)</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  buffer >>= 8;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">break</span>;</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>  }</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordtype">void</span> Writer::Write32Bit(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> data)</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  {</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  WriteCh((<span class="keywordtype">unsigned</span>)((data >> 24) & 0xff));</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  WriteCh((<span class="keywordtype">unsigned</span>)((data >> 16) & 0xff));</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  WriteCh((<span class="keywordtype">unsigned</span>)((data >> 8 ) & 0xff));</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  WriteCh((<span class="keywordtype">unsigned</span>)(data & 0xff));</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> </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordtype">void</span> Writer::Write16Bit(<span class="keywordtype">int</span> data)</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  WriteCh((<span class="keywordtype">unsigned</span>)((data & 0xff00) >> 8));</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  WriteCh((<span class="keywordtype">unsigned</span>)(data & 0xff));</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  }</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordtype">void</span> Writer::WriteCh(<span class="keywordtype">char</span> c)</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  {</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  fputc(c,mFile);</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  mBytesWritten++;</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> </div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment">// END</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
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