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Generate SDK documents for commit 845766f69a745f176fe4854449c2b67b9ab00997
2015-10-19 17:27:30 +00:00
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright (c) 2015 The Chromium Authors. All rights reserved.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">// Use of this source code is governed by a BSD-style license that can be</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// found in the LICENSE file.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;</div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="preprocessor">#include &quot;packager/base/logging.h&quot;</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/webm/opus_packet_builder.h&quot;</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/webm/webm_cluster_parser.h&quot;</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="keyword">namespace </span>edash_packager {</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;OpusPacket::OpusPacket(uint8_t config, uint8_t frame_count, <span class="keywordtype">bool</span> is_VBR) {</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160; DCHECK_GE(config, 0);</div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160; DCHECK_LT(config, kNumPossibleOpusConfigs);</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160; DCHECK_GE(frame_count, kMinOpusPacketFrameCount);</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160; DCHECK_LE(frame_count, kMaxOpusPacketFrameCount);</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; duration_ms_ = frame_count *</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; WebMClusterParser::kOpusFrameDurationsMu[config] /</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160; <span class="keyword">static_cast&lt;</span><span class="keywordtype">float</span><span class="keyword">&gt;</span>(1000);</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; uint8_t frame_count_code;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; uint8_t frame_count_byte;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; <span class="keywordflow">if</span> (frame_count == 1) {</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; frame_count_code = 0;</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (frame_count == 2) {</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; frame_count_code = is_VBR ? 2 : 1;</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; frame_count_code = 3;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; frame_count_byte = (is_VBR ? 1 &lt;&lt; 7 : 0) | frame_count;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; }</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="comment">// All opus packets must have TOC byte.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; uint8_t opus_toc_byte = (config &lt;&lt; 3) | frame_count_code;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; data_.push_back(opus_toc_byte);</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="comment">// For code 3 packets, the number of frames is signaled in the &quot;frame</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="comment">// count byte&quot;.</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; <span class="keywordflow">if</span> (frame_count_code == 3) {</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; data_.push_back(frame_count_byte);</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; }</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="comment">// Packet will only conform to layout specification for the TOC byte</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="comment">// and optional frame count bytes appended above. This last byte</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="comment">// is purely dummy padding where frame size data or encoded data might</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="comment">// otherwise start.</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; data_.push_back(static_cast&lt;uint8_t&gt;(0));</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;}</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;OpusPacket::~OpusPacket() {</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;}</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;<span class="keyword">const</span> uint8_t* OpusPacket::data()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordflow">return</span> &amp;(data_[0]);</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;}</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;<span class="keywordtype">int</span> OpusPacket::size()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keywordflow">return</span> data_.size();</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;}</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;<span class="keywordtype">double</span> OpusPacket::duration_ms()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="keywordflow">return</span> duration_ms_;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;}</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;ScopedVector&lt;OpusPacket&gt; BuildAllOpusPackets() {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; ScopedVector&lt;OpusPacket&gt; opus_packets;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> frame_count = kMinOpusPacketFrameCount;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; frame_count &lt;= kMaxOpusPacketFrameCount; frame_count++) {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> opus_config_num = 0; opus_config_num &lt; kNumPossibleOpusConfigs;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; opus_config_num++) {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordtype">bool</span> is_VBR = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; opus_packets.push_back(</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keyword">new</span> OpusPacket(opus_config_num, frame_count, is_VBR));</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keywordflow">if</span> (frame_count &gt;= 2) {</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="comment">// Add another packet with VBR flag toggled. For frame counts &gt;= 2,</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="comment">// VBR triggers changes to packet framing.</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; is_VBR = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; opus_packets.push_back(</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="keyword">new</span> OpusPacket(opus_config_num, frame_count, is_VBR));</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; }</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; }</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; }</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="keywordflow">return</span> opus_packets.Pass();</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;}</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;} <span class="comment">// namespace edash_packager</span></div>
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