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<div class="title">es_parser_adts.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/mp2t/es_parser_adts.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 <stdint.h></span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <list></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "packager/base/strings/string_number_conversions.h"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/media/base/audio_timestamp_helper.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "packager/media/base/bit_reader.h"</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include "packager/media/base/media_sample.h"</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "packager/media/base/timestamp.h"</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "packager/media/formats/mp2t/adts_header.h"</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include "packager/media/formats/mp2t/mp2t_common.h"</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include "packager/media/formats/mpeg/adts_constants.h"</span></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> <span class="keyword">namespace </span>edash_packager {</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">namespace </span>media {</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> <span class="comment">// Return true if buf corresponds to an ADTS syncword.</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// |buf| size must be at least 2.</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> isAdtsSyncWord(<span class="keyword">const</span> uint8_t* buf) {</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">return</span> (buf[0] == 0xff) && ((buf[1] & 0xf6) == 0xf0);</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> }</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> <span class="comment">// Look for an ADTS syncword.</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// |new_pos| returns</span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// - either the byte position of the ADTS frame (if found)</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// - or the byte position of 1st byte that was not processed (if not found).</span></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// In every case, the returned value in |new_pos| is such that new_pos >= pos</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// |frame_sz| returns the size of the ADTS frame (if found).</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// Return whether a syncword was found.</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> LookForSyncWord(<span class="keyword">const</span> uint8_t* raw_es,</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordtype">int</span> raw_es_size,</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordtype">int</span> pos,</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordtype">int</span>* new_pos,</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordtype">int</span>* frame_sz) {</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  DCHECK_GE(pos, 0);</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  DCHECK_LE(pos, raw_es_size);</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordtype">int</span> max_offset = raw_es_size - kAdtsHeaderMinSize;</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">if</span> (pos >= max_offset) {</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// Do not change the position if:</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// - max_offset < 0: not enough bytes to get a full header</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// Since pos >= 0, this is a subcase of the next condition.</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// - pos >= max_offset: might be the case after reading one full frame,</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// |pos| is then incremented by the frame size and might then point</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// to the end of the buffer.</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  *new_pos = pos;</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> </div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> offset = pos; offset < max_offset; offset++) {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">const</span> uint8_t* cur_buf = &raw_es[offset];</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> (!isAdtsSyncWord(cur_buf))</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">// The first 12 bits must be 1.</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// The layer field (2 bits) must be set to 0.</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">continue</span>;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordtype">int</span> frame_size =</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <a class="code" href="../../db/d69/classedash__packager_1_1media_1_1mp2t_1_1AdtsHeader.html#aacce540b215432703697c6a1172c3011">mp2t::AdtsHeader::GetAdtsFrameSize</a>(cur_buf, kAdtsHeaderMinSize);</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">if</span> (frame_size < kAdtsHeaderMinSize) {</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// Too short to be an ADTS frame.</span></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">continue</span>;</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="comment">// Check whether there is another frame</span></div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// |size| apart from the current one.</span></div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordtype">int</span> remaining_size = raw_es_size - offset;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">if</span> (remaining_size >= frame_size + 2 &&</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  !isAdtsSyncWord(&cur_buf[frame_size])) {</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">continue</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> </div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  *new_pos = offset;</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  *frame_sz = frame_size;</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  }</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  *new_pos = max_offset;</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> }</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="keyword">namespace </span>mp2t {</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> EsParserAdts::EsParserAdts(uint32_t pid,</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keyword">const</span> NewStreamInfoCB& new_stream_info_cb,</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">const</span> EmitSampleCB& emit_sample_cb,</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">bool</span> sbr_in_mimetype)</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  : EsParser(pid),</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  new_stream_info_cb_(new_stream_info_cb),</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  emit_sample_cb_(emit_sample_cb),</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  sbr_in_mimetype_(sbr_in_mimetype) {</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> }</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> EsParserAdts::~EsParserAdts() {</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> }</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="keywordtype">bool</span> EsParserAdts::Parse(<span class="keyword">const</span> uint8_t* buf,</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordtype">int</span> size,</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  int64_t pts,</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  int64_t dts) {</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">int</span> raw_es_size;</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keyword">const</span> uint8_t* raw_es;</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// The incoming PTS applies to the access unit that comes just after</span></div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// the beginning of |buf|.</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (pts != kNoTimestamp) {</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  es_byte_queue_.<a class="code" href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#a8253df160751462f3b75290a7c525e56">Peek</a>(&raw_es, &raw_es_size);</div>
|
|
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  pts_list_.push_back(EsPts(raw_es_size, pts));</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="comment">// Copy the input data to the ES buffer.</span></div>
|
|
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  es_byte_queue_.<a class="code" href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#afa47d3dc54862cee101d4be8746de6eb">Push</a>(buf, size);</div>
|
|
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  es_byte_queue_.<a class="code" href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#a8253df160751462f3b75290a7c525e56">Peek</a>(&raw_es, &raw_es_size);</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="comment">// Look for every ADTS frame in the ES buffer starting at offset = 0</span></div>
|
|
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordtype">int</span> es_position = 0;</div>
|
|
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordtype">int</span> frame_size;</div>
|
|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">while</span> (LookForSyncWord(raw_es, raw_es_size, es_position,</div>
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|
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  &es_position, &frame_size)) {</div>
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|
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keyword">const</span> uint8_t* frame_ptr = raw_es + es_position;</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  DVLOG(LOG_LEVEL_ES)</div>
|
|
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  << <span class="stringliteral">"ADTS syncword @ pos="</span> << es_position</div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  << <span class="stringliteral">" frame_size="</span> << frame_size;</div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  DVLOG(LOG_LEVEL_ES)</div>
|
|
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  << <span class="stringliteral">"ADTS header: "</span></div>
|
|
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  << base::HexEncode(frame_ptr, kAdtsHeaderMinSize);</div>
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|
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div>
|
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="comment">// Do not process the frame if this one is a partial frame.</span></div>
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|
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordtype">int</span> remaining_size = raw_es_size - es_position;</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">if</span> (frame_size > remaining_size)</div>
|
|
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">break</span>;</div>
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<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>  <span class="keywordtype">size_t</span> header_size = <a class="code" href="../../db/d69/classedash__packager_1_1media_1_1mp2t_1_1AdtsHeader.html#a87affdf0dc61bedb13bafd76c3d5b484">AdtsHeader::GetAdtsHeaderSize</a>(frame_ptr, frame_size);</div>
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|
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div>
|
|
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="comment">// Update the audio configuration if needed.</span></div>
|
|
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  DCHECK_GE(frame_size, kAdtsHeaderMinSize);</div>
|
|
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">if</span> (!UpdateAudioConfiguration(frame_ptr, frame_size))</div>
|
|
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
|
|
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="comment">// Get the PTS & the duration of this access unit.</span></div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">while</span> (!pts_list_.empty() &&</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  pts_list_.front().first <= es_position) {</div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  audio_timestamp_helper_->SetBaseTimestamp(pts_list_.front().second);</div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  pts_list_.pop_front();</div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  }</div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div>
|
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  int64_t current_pts = audio_timestamp_helper_->GetTimestamp();</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  int64_t frame_duration =</div>
|
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  audio_timestamp_helper_->GetFrameDuration(kSamplesPerAACFrame);</div>
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|
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> </div>
|
|
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="comment">// Emit an audio frame.</span></div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordtype">bool</span> is_key_frame = <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  scoped_refptr<MediaSample> sample =</div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <a class="code" href="../../d8/d6c/classedash__packager_1_1media_1_1MediaSample.html#ac65ec88fbe6d8b72c65b1ff3f68c5b02">MediaSample::CopyFrom</a>(</div>
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|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  frame_ptr + header_size,</div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  frame_size - header_size,</div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  is_key_frame);</div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  sample->set_pts(current_pts);</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  sample->set_dts(current_pts);</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  sample->set_duration(frame_duration);</div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  emit_sample_cb_.Run(pid(), sample);</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>  <span class="comment">// Update the PTS of the next frame.</span></div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  audio_timestamp_helper_->AddFrames(kSamplesPerAACFrame);</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="comment">// Skip the current frame.</span></div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  es_position += frame_size;</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  }</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>  <span class="comment">// Discard all the bytes that have been processed.</span></div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  DiscardEs(es_position);</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> }</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="keywordtype">void</span> EsParserAdts::Flush() {</div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> }</div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> </div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="keywordtype">void</span> EsParserAdts::Reset() {</div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  es_byte_queue_.<a class="code" href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#a452485879d303d5c8654e1b184bc1235">Reset</a>();</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  pts_list_.clear();</div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  last_audio_decoder_config_ = scoped_refptr<AudioStreamInfo>();</div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> }</div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> </div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="keywordtype">bool</span> EsParserAdts::UpdateAudioConfiguration(<span class="keyword">const</span> uint8_t* adts_frame,</div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordtype">size_t</span> adts_frame_size) {</div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keyword">const</span> uint8_t kAacSampleSizeBits(16);</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  AdtsHeader adts_header;</div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">if</span> (!adts_header.Parse(adts_frame, adts_frame_size)) {</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  LOG(ERROR) << <span class="stringliteral">"Error parsing ADTS frame header."</span>;</div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">return</span> <span class="keyword">false</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>  std::vector<uint8_t> audio_specific_config;</div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">if</span> (!adts_header.GetAudioSpecificConfig(&audio_specific_config))</div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">if</span> (last_audio_decoder_config_) {</div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="comment">// Verify that the audio decoder config has not changed.</span></div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordflow">if</span> (last_audio_decoder_config_->extra_data() == audio_specific_config) {</div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="comment">// Audio configuration has not changed.</span></div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  }</div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  NOTIMPLEMENTED() << <span class="stringliteral">"Varying audio configurations are not supported."</span>;</div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">return</span> <span class="keyword">false</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> </div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="comment">// The following code is written according to ISO 14496 Part 3 Table 1.11 and</span></div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="comment">// Table 1.22. (Table 1.11 refers to the capping to 48000, Table 1.22 refers</span></div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="comment">// to SBR doubling the AAC sample rate.)</span></div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keywordtype">int</span> samples_per_second = adts_header.GetSamplingFrequency();</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordtype">int</span> extended_samples_per_second = sbr_in_mimetype_</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  ? std::min(2 * samples_per_second, 48000)</div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  : samples_per_second;</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>  last_audio_decoder_config_ = scoped_refptr<StreamInfo>(</div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keyword">new</span> AudioStreamInfo(</div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  pid(),</div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  kMpeg2Timescale,</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  kInfiniteDuration,</div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  kCodecAAC,</div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <a class="code" href="../../da/d27/classedash__packager_1_1media_1_1AudioStreamInfo.html#aa62e486f463c867b8e2f41ebb4ecea34">AudioStreamInfo::GetCodecString</a>(kCodecAAC,</div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  adts_header.GetObjectType()),</div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  std::string(),</div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  kAacSampleSizeBits,</div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  adts_header.GetNumChannels(),</div>
|
|
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  extended_samples_per_second,</div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  audio_specific_config.data(),</div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  audio_specific_config.size(),</div>
|
|
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keyword">false</span>));</div>
|
|
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> </div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  DVLOG(1) << <span class="stringliteral">"Sampling frequency: "</span> << samples_per_second;</div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  DVLOG(1) << <span class="stringliteral">"Extended sampling frequency: "</span> << extended_samples_per_second;</div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  DVLOG(1) << <span class="stringliteral">"Channel config: "</span> << adts_header.GetNumChannels();</div>
|
|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  DVLOG(1) << <span class="stringliteral">"Object type: "</span> << adts_header.GetObjectType();</div>
|
|
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="comment">// Reset the timestamp helper to use a new sampling frequency.</span></div>
|
|
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">if</span> (audio_timestamp_helper_) {</div>
|
|
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  int64_t base_timestamp = audio_timestamp_helper_->GetTimestamp();</div>
|
|
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  audio_timestamp_helper_.reset(</div>
|
|
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keyword">new</span> AudioTimestampHelper(kMpeg2Timescale, samples_per_second));</div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  audio_timestamp_helper_->SetBaseTimestamp(base_timestamp);</div>
|
|
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  audio_timestamp_helper_.reset(</div>
|
|
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keyword">new</span> AudioTimestampHelper(kMpeg2Timescale, extended_samples_per_second));</div>
|
|
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  }</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>  <span class="comment">// Audio config notification.</span></div>
|
|
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  new_stream_info_cb_.Run(last_audio_decoder_config_);</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>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> }</div>
|
|
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> </div>
|
|
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="keywordtype">void</span> EsParserAdts::DiscardEs(<span class="keywordtype">int</span> nbytes) {</div>
|
|
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  DCHECK_GE(nbytes, 0);</div>
|
|
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keywordflow">if</span> (nbytes <= 0)</div>
|
|
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div>
|
|
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="comment">// Adjust the ES position of each PTS.</span></div>
|
|
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">for</span> (EsPtsList::iterator it = pts_list_.begin(); it != pts_list_.end(); ++it)</div>
|
|
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  it->first -= nbytes;</div>
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div>
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="comment">// Discard |nbytes| of ES.</span></div>
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<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  es_byte_queue_.<a class="code" href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#acac5c7874703c86ba77a50d3be0671d2">Pop</a>(nbytes);</div>
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<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> }</div>
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<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> </div>
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<div class="line"><a name="l00274"></a><span class="lineno"> 274</span> } <span class="comment">// namespace mp2t</span></div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> } <span class="comment">// namespace edash_packager</span></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1mp2t_1_1AdtsHeader_html_aacce540b215432703697c6a1172c3011"><div class="ttname"><a href="../../db/d69/classedash__packager_1_1media_1_1mp2t_1_1AdtsHeader.html#aacce540b215432703697c6a1172c3011">edash_packager::media::mp2t::AdtsHeader::GetAdtsFrameSize</a></div><div class="ttdeci">static size_t GetAdtsFrameSize(const uint8_t *data, size_t num_bytes)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d5b/adts__header_8cc_source.html#l00023">adts_header.cc:23</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1ByteQueue_html_afa47d3dc54862cee101d4be8746de6eb"><div class="ttname"><a href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#afa47d3dc54862cee101d4be8746de6eb">edash_packager::media::ByteQueue::Push</a></div><div class="ttdeci">void Push(const uint8_t *data, int size)</div><div class="ttdoc">Append new bytes to the end of the queue. </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00029">byte_queue.cc:29</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1ByteQueue_html_acac5c7874703c86ba77a50d3be0671d2"><div class="ttname"><a href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#acac5c7874703c86ba77a50d3be0671d2">edash_packager::media::ByteQueue::Pop</a></div><div class="ttdeci">void Pop(int count)</div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00070">byte_queue.cc:70</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1MediaSample_html_ac65ec88fbe6d8b72c65b1ff3f68c5b02"><div class="ttname"><a href="../../d8/d6c/classedash__packager_1_1media_1_1MediaSample.html#ac65ec88fbe6d8b72c65b1ff3f68c5b02">edash_packager::media::MediaSample::CopyFrom</a></div><div class="ttdeci">static scoped_refptr< MediaSample > CopyFrom(const uint8_t *data, size_t size, bool is_key_frame)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d0d/media__sample_8cc_source.html#l00047">media_sample.cc:47</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1mp2t_1_1AdtsHeader_html_a87affdf0dc61bedb13bafd76c3d5b484"><div class="ttname"><a href="../../db/d69/classedash__packager_1_1media_1_1mp2t_1_1AdtsHeader.html#a87affdf0dc61bedb13bafd76c3d5b484">edash_packager::media::mp2t::AdtsHeader::GetAdtsHeaderSize</a></div><div class="ttdeci">static size_t GetAdtsHeaderSize(const uint8_t *data, size_t num_bytes)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d5b/adts__header_8cc_source.html#l00031">adts_header.cc:31</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1ByteQueue_html_a452485879d303d5c8654e1b184bc1235"><div class="ttname"><a href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#a452485879d303d5c8654e1b184bc1235">edash_packager::media::ByteQueue::Reset</a></div><div class="ttdeci">void Reset()</div><div class="ttdoc">Reset the queue to the empty state. </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00024">byte_queue.cc:24</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AudioStreamInfo_html_aa62e486f463c867b8e2f41ebb4ecea34"><div class="ttname"><a href="../../da/d27/classedash__packager_1_1media_1_1AudioStreamInfo.html#aa62e486f463c867b8e2f41ebb4ecea34">edash_packager::media::AudioStreamInfo::GetCodecString</a></div><div class="ttdeci">static std::string GetCodecString(AudioCodec codec, uint8_t audio_object_type)</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d04/audio__stream__info_8cc_source.html#l00098">audio_stream_info.cc:98</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1ByteQueue_html_a8253df160751462f3b75290a7c525e56"><div class="ttname"><a href="../../d8/d2e/classedash__packager_1_1media_1_1ByteQueue.html#a8253df160751462f3b75290a7c525e56">edash_packager::media::ByteQueue::Peek</a></div><div class="ttdeci">void Peek(const uint8_t **data, int *size) const </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00063">byte_queue.cc:63</a></div></div>
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<!-- start footer part -->
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Generated on Thu Nov 5 2015 01:47:32 for DASH Media Packaging SDK by  <a href="http://www.doxygen.org/index.html">
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