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<div class="title">webm_audio_client.cc</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2014 The Chromium Authors. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Use of this source code is governed by a BSD-style license that can be</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// found in the LICENSE file.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "packager/media/formats/webm/webm_audio_client.h"</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include "packager/media/formats/webm/webm_constants.h"</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// Timestamps are represented in double in WebM. Convert to uint64_t in us.</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="keyword">const</span> uint32_t kWebMTimeScale = 1000000u;</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> } <span class="comment">// namespace</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> WebMAudioClient::WebMAudioClient() {</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <a class="code" href="../../d3/d7c/classshaka_1_1media_1_1WebMAudioClient.html#afd1a338848c52dc4db79d89ae13b6ea6">Reset</a>();</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> }</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> WebMAudioClient::~WebMAudioClient() {</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> }</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
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<div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="../../d3/d7c/classshaka_1_1media_1_1WebMAudioClient.html#afd1a338848c52dc4db79d89ae13b6ea6"> 25</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d3/d7c/classshaka_1_1media_1_1WebMAudioClient.html#afd1a338848c52dc4db79d89ae13b6ea6">WebMAudioClient::Reset</a>() {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  channels_ = -1;</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  samples_per_second_ = -1;</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  output_samples_per_second_ = -1;</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> }</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div>
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<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="../../d3/d7c/classshaka_1_1media_1_1WebMAudioClient.html#a0fcbddd20199044f860331b3bd9ef3b8"> 31</a></span> std::shared_ptr<AudioStreamInfo> <a class="code" href="../../d3/d7c/classshaka_1_1media_1_1WebMAudioClient.html#a0fcbddd20199044f860331b3bd9ef3b8">WebMAudioClient::GetAudioStreamInfo</a>(</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  int64_t track_num,</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">const</span> std::string& codec_id,</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">const</span> std::vector<uint8_t>& codec_private,</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  int64_t seek_preroll,</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  int64_t codec_delay,</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keyword">const</span> std::string& language,</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordtype">bool</span> is_encrypted) {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  Codec audio_codec = kUnknownCodec;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">if</span> (codec_id == <span class="stringliteral">"A_VORBIS"</span>) {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  audio_codec = kCodecVorbis;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (codec_id == <span class="stringliteral">"A_OPUS"</span>) {</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  audio_codec = kCodecOpus;</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  LOG(ERROR) << <span class="stringliteral">"Unsupported audio codec_id "</span> << codec_id;</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> std::shared_ptr<AudioStreamInfo>();</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  }</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (samples_per_second_ <= 0)</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> std::shared_ptr<AudioStreamInfo>();</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// Set channel layout default if a Channels element was not present.</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">if</span> (channels_ == -1)</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  channels_ = 1;</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  uint32_t sampling_frequency = samples_per_second_;</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// Always use 48kHz for OPUS. See the "Input Sample Rate" section of the</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// spec: http://tools.ietf.org/html/draft-terriberry-oggopus-01#page-11</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">if</span> (audio_codec == kCodecOpus) {</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  sampling_frequency = 48000;</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  }</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">const</span> uint8_t* codec_config = NULL;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordtype">size_t</span> codec_config_size = 0;</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> (codec_private.size() > 0) {</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  codec_config = &codec_private[0];</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  codec_config_size = codec_private.size();</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">const</span> uint8_t kSampleSizeInBits = 16u;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">return</span> std::make_shared<AudioStreamInfo>(</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  track_num, kWebMTimeScale, 0, audio_codec,</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <a class="code" href="../../da/d4e/classshaka_1_1media_1_1AudioStreamInfo.html#aee79e7aa61b741bb96f451c6de1c9d42">AudioStreamInfo::GetCodecString</a>(audio_codec, 0), codec_config,</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  codec_config_size, kSampleSizeInBits, channels_, sampling_frequency,</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  seek_preroll < 0 ? 0 : seek_preroll, codec_delay < 0 ? 0 : codec_delay, 0,</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  0, language, is_encrypted);</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> }</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="keywordtype">bool</span> WebMAudioClient::OnUInt(<span class="keywordtype">int</span> <span class="keywordtype">id</span>, int64_t val) {</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (<span class="keywordtype">id</span> == kWebMIdChannels) {</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">if</span> (channels_ != -1) {</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  LOG(ERROR) << <span class="stringliteral">"Multiple values for id "</span> << std::hex << <span class="keywordtype">id</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  << <span class="stringliteral">" specified. ("</span> << channels_ << <span class="stringliteral">" and "</span> << val << <span class="stringliteral">")"</span>;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  }</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  channels_ = val;</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> }</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="keywordtype">bool</span> WebMAudioClient::OnFloat(<span class="keywordtype">int</span> <span class="keywordtype">id</span>, <span class="keywordtype">double</span> val) {</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordtype">double</span>* dst = NULL;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">switch</span> (<span class="keywordtype">id</span>) {</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">case</span> kWebMIdSamplingFrequency:</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  dst = &samples_per_second_;</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">case</span> kWebMIdOutputSamplingFrequency:</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  dst = &output_samples_per_second_;</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">default</span>:</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (val <= 0)</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">if</span> (*dst != -1) {</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  LOG(ERROR) << <span class="stringliteral">"Multiple values for id "</span> << std::hex << <span class="keywordtype">id</span> << <span class="stringliteral">" specified ("</span></div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  << *dst << <span class="stringliteral">" and "</span> << val << <span class="stringliteral">")"</span>;</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  *dst = val;</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> }</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1WebMAudioClient_html_a0fcbddd20199044f860331b3bd9ef3b8"><div class="ttname"><a href="../../d3/d7c/classshaka_1_1media_1_1WebMAudioClient.html#a0fcbddd20199044f860331b3bd9ef3b8">shaka::media::WebMAudioClient::GetAudioStreamInfo</a></div><div class="ttdeci">std::shared_ptr< AudioStreamInfo > GetAudioStreamInfo(int64_t track_num, const std::string &codec_id, const std::vector< uint8_t > &codec_private, int64_t seek_preroll, int64_t codec_delay, const std::string &language, bool is_encrypted)</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d8e/webm__audio__client_8cc_source.html#l00031">webm_audio_client.cc:31</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1AudioStreamInfo_html_aee79e7aa61b741bb96f451c6de1c9d42"><div class="ttname"><a href="../../da/d4e/classshaka_1_1media_1_1AudioStreamInfo.html#aee79e7aa61b741bb96f451c6de1c9d42">shaka::media::AudioStreamInfo::GetCodecString</a></div><div class="ttdeci">static std::string GetCodecString(Codec codec, uint8_t audio_object_type)</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d04/audio__stream__info_8cc_source.html#l00095">audio_stream_info.cc:95</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1WebMAudioClient_html_afd1a338848c52dc4db79d89ae13b6ea6"><div class="ttname"><a href="../../d3/d7c/classshaka_1_1media_1_1WebMAudioClient.html#afd1a338848c52dc4db79d89ae13b6ea6">shaka::media::WebMAudioClient::Reset</a></div><div class="ttdeci">void Reset()</div><div class="ttdoc">Reset this object's state so it can process a new audio track element. </div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d8e/webm__audio__client_8cc_source.html#l00025">webm_audio_client.cc:25</a></div></div>
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