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<div class="title">avio_reading.c</div> </div>
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<a href="avio__reading_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2014 Stefano Sabatini</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * of this software and associated documentation files (the "Software"), to deal</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * in the Software without restriction, including without limitation the rights</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * furnished to do so, subject to the following conditions:</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * The above copyright notice and this permission notice shall be included in</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * THE SOFTWARE.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * @file</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * libavformat AVIOContext API example.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * Make libavformat demuxer access media content through a custom</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * AVIOContext read callback.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * @example avio_reading.c</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <<a class="code" href="avcodec_8h.html">libavcodec/avcodec.h</a>></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#include <<a class="code" href="avformat_8h.html">libavformat/avformat.h</a>></span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include <<a class="code" href="avio_8h.html">libavformat/avio.h</a>></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include <<a class="code" href="file_8h.html">libavutil/file.h</a>></span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="structbuffer__data.html"> 37</a></span> <span class="keyword">struct </span><a class="code" href="structbuffer__data.html">buffer_data</a> {</div>
<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="structbuffer__data.html#a017ad9c72fdc7666c29841ddeefc8cd8"> 38</a></span>  uint8_t *<a class="code" href="structbuffer__data.html#a017ad9c72fdc7666c29841ddeefc8cd8">ptr</a>;</div>
<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="structbuffer__data.html#a9ca6d8ef5edd7f113c04c865f9367f8c"> 39</a></span>  <span class="keywordtype">size_t</span> <a class="code" href="structbuffer__data.html#a9ca6d8ef5edd7f113c04c865f9367f8c">size</a>; <span class="comment">///< size left in the buffer</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"></span>};</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="avio__reading_8c.html#a3a86bff38e7cb9093d0a32316b73b29c"> 42</a></span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="avio__reading_8c.html#a3a86bff38e7cb9093d0a32316b73b29c">read_packet</a>(<span class="keywordtype">void</span> *opaque, uint8_t *buf, <span class="keywordtype">int</span> buf_size)</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">struct </span><a class="code" href="structbuffer__data.html">buffer_data</a> *bd = (<span class="keyword">struct </span><a class="code" href="structbuffer__data.html">buffer_data</a> *)opaque;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  buf_size = <a class="code" href="common_8h.html#a0f84cbd7fd810cd678157c98cbfad4b0">FFMIN</a>(buf_size, bd-><a class="code" href="structbuffer__data.html#a9ca6d8ef5edd7f113c04c865f9367f8c">size</a>);</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  printf(<span class="stringliteral">"ptr:%p size:%zu\n"</span>, bd-><a class="code" href="structbuffer__data.html#a017ad9c72fdc7666c29841ddeefc8cd8">ptr</a>, bd-><a class="code" href="structbuffer__data.html#a9ca6d8ef5edd7f113c04c865f9367f8c">size</a>);</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">/* copy internal buffer data to buf */</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  memcpy(buf, bd-><a class="code" href="structbuffer__data.html#a017ad9c72fdc7666c29841ddeefc8cd8">ptr</a>, buf_size);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  bd-><a class="code" href="structbuffer__data.html#a017ad9c72fdc7666c29841ddeefc8cd8">ptr</a> += buf_size;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  bd-><a class="code" href="structbuffer__data.html#a9ca6d8ef5edd7f113c04c865f9367f8c">size</a> -= buf_size;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">return</span> buf_size;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> }</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div>
<div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="avio__reading_8c.html#a0ddf1224851353fc92bfbff6f499fa97"> 57</a></span> <span class="keywordtype">int</span> <a class="code" href="avio__reading_8c.html#a0ddf1224851353fc92bfbff6f499fa97">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="structAVFormatContext.html">AVFormatContext</a> *<a class="code" href="demuxing__decoding_8c.html#a409462acdf7aebe5bfbe1bcd811efa5d">fmt_ctx</a> = NULL;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <a class="code" href="structAVIOContext.html">AVIOContext</a> *avio_ctx = NULL;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  uint8_t *buffer = NULL, *avio_ctx_buffer = NULL;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">size_t</span> buffer_size, avio_ctx_buffer_size = 4096;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">char</span> *input_filename = NULL;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordtype">int</span> ret = 0;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">struct </span><a class="code" href="structbuffer__data.html">buffer_data</a> bd = { 0 };</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>  <span class="keywordflow">if</span> (argc != 2) {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  fprintf(stderr, <span class="stringliteral">"usage: %s input_file\n"</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="stringliteral">"API example program to show how to read from a custom buffer "</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="stringliteral">"accessed through AVIOContext.\n"</span>, argv[0]);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">return</span> 1;</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>  input_filename = argv[1];</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">/* register codecs and formats and other lavf/lavc components*/</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <a class="code" href="group__lavf__core.html#ga917265caec45ef5a0646356ed1a507e3">av_register_all</a>();</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">/* slurp file content into buffer */</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  ret = <a class="code" href="file_8h.html#ade51c2ba717b70fab329362952906cfe">av_file_map</a>(input_filename, &buffer, &buffer_size, 0, NULL);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (ret < 0)</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">/* fill opaque structure used by the AVIOContext read callback */</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  bd.<a class="code" href="structbuffer__data.html#a017ad9c72fdc7666c29841ddeefc8cd8">ptr</a> = buffer;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  bd.<a class="code" href="structbuffer__data.html#a9ca6d8ef5edd7f113c04c865f9367f8c">size</a> = buffer_size;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span> (!(fmt_ctx = <a class="code" href="group__lavf__core.html#gac7a91abf2f59648d995894711f070f62">avformat_alloc_context</a>())) {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">goto</span> end;</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>  avio_ctx_buffer = <a class="code" href="group__lavu__mem.html#ga9722446c5e310ffedfaac9489864796d">av_malloc</a>(avio_ctx_buffer_size);</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">if</span> (!avio_ctx_buffer) {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  }</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  avio_ctx = <a class="code" href="avio_8h.html#a853f5149136a27ffba3207d8520172a5">avio_alloc_context</a>(avio_ctx_buffer, avio_ctx_buffer_size,</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  0, &bd, &<a class="code" href="avio__reading_8c.html#a3a86bff38e7cb9093d0a32316b73b29c">read_packet</a>, NULL, NULL);</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">if</span> (!avio_ctx) {</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">goto</span> end;</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>  fmt_ctx-><a class="code" href="structAVFormatContext.html#a1e7324262b6b78522e52064daaa7bc87">pb</a> = avio_ctx;</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>  ret = <a class="code" href="group__lavf__decoding.html#ga31d601155e9035d5b0e7efedc894ee49">avformat_open_input</a>(&fmt_ctx, NULL, NULL, NULL);</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  fprintf(stderr, <span class="stringliteral">"Could not open input\n"</span>);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">goto</span> end;</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> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  ret = <a class="code" href="group__lavf__decoding.html#gad42172e27cddafb81096939783b157bb">avformat_find_stream_info</a>(fmt_ctx, NULL);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  fprintf(stderr, <span class="stringliteral">"Could not find stream information\n"</span>);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">goto</span> end;</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> </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <a class="code" href="group__lavf__misc.html#gae2645941f2dc779c307eb6314fd39f10">av_dump_format</a>(fmt_ctx, 0, input_filename, 0);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> end:</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4">avformat_close_input</a>(&fmt_ctx);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">/* note: the internal buffer could have changed, and be != avio_ctx_buffer */</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span> (avio_ctx) {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&avio_ctx-><a class="code" href="structAVIOContext.html#a901e8fd2b978d40957c4ed0b77c2daf0">buffer</a>);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&avio_ctx);</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>  <a class="code" href="file_8h.html#a12e643af4a329ae6d1d567d8a782af1e">av_file_unmap</a>(buffer, buffer_size);</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  fprintf(stderr, <span class="stringliteral">"Error occurred: %s\n"</span>, <a class="code" href="group__lavu__error.html#gac4f6e109c242c81aeee21868d3f35e12">av_err2str</a>(ret));</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> 1;</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> </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> }</div>
<div class="ttc" id="group__lavu__mem_html_ga9722446c5e310ffedfaac9489864796d"><div class="ttname"><a href="group__lavu__mem.html#ga9722446c5e310ffedfaac9489864796d">av_malloc</a></div><div class="ttdeci">void * av_malloc(size_t size) av_malloc_attrib 1(1)</div><div class="ttdoc">Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...</div></div>
<div class="ttc" id="structAVIOContext_html"><div class="ttname"><a href="structAVIOContext.html">AVIOContext</a></div><div class="ttdoc">Bytestream IO Context. </div><div class="ttdef"><b>Definition:</b> <a href="avio_8h_source.html#l00111">avio.h:111</a></div></div>
<div class="ttc" id="avio_8h_html"><div class="ttname"><a href="avio_8h.html">avio.h</a></div><div class="ttdoc">Buffered I/O operations. </div></div>
<div class="ttc" id="demuxing__decoding_8c_html_a409462acdf7aebe5bfbe1bcd811efa5d"><div class="ttname"><a href="demuxing__decoding_8c.html#a409462acdf7aebe5bfbe1bcd811efa5d">fmt_ctx</a></div><div class="ttdeci">static AVFormatContext * fmt_ctx</div><div class="ttdef"><b>Definition:</b> <a href="demuxing__decoding_8c_source.html#l00037">demuxing_decoding.c:37</a></div></div>
<div class="ttc" id="structAVIOContext_html_a901e8fd2b978d40957c4ed0b77c2daf0"><div class="ttname"><a href="structAVIOContext.html#a901e8fd2b978d40957c4ed0b77c2daf0">AVIOContext::buffer</a></div><div class="ttdeci">unsigned char * buffer</div><div class="ttdoc">Start of the buffer. </div><div class="ttdef"><b>Definition:</b> <a href="avio_8h_source.html#l00172">avio.h:172</a></div></div>
<div class="ttc" id="group__lavu__mem_html_ga0cc84043ea2167ad005c86e11d0bcdba"><div class="ttname"><a href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a></div><div class="ttdeci">void av_freep(void *ptr)</div><div class="ttdoc">Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...</div></div>
<div class="ttc" id="structAVFormatContext_html"><div class="ttname"><a href="structAVFormatContext.html">AVFormatContext</a></div><div class="ttdoc">Format I/O context. </div><div class="ttdef"><b>Definition:</b> <a href="avformat_8h_source.html#l01314">avformat.h:1314</a></div></div>
<div class="ttc" id="group__lavf__core_html_gac7a91abf2f59648d995894711f070f62"><div class="ttname"><a href="group__lavf__core.html#gac7a91abf2f59648d995894711f070f62">avformat_alloc_context</a></div><div class="ttdeci">AVFormatContext * avformat_alloc_context(void)</div><div class="ttdoc">Allocate an AVFormatContext. </div></div>
<div class="ttc" id="file_8h_html"><div class="ttname"><a href="file_8h.html">file.h</a></div><div class="ttdoc">Misc file utilities. </div></div>
<div class="ttc" id="group__lavf__misc_html_gae2645941f2dc779c307eb6314fd39f10"><div class="ttname"><a href="group__lavf__misc.html#gae2645941f2dc779c307eb6314fd39f10">av_dump_format</a></div><div class="ttdeci">void av_dump_format(AVFormatContext *ic, int index, const char *url, int is_output)</div><div class="ttdoc">Print detailed information about the input or output format, such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base. </div></div>
<div class="ttc" id="avio_8h_html_a853f5149136a27ffba3207d8520172a5"><div class="ttname"><a href="avio_8h.html#a853f5149136a27ffba3207d8520172a5">avio_alloc_context</a></div><div class="ttdeci">AVIOContext * avio_alloc_context(unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))</div><div class="ttdoc">Allocate and initialize an AVIOContext for buffered I/O. </div></div>
<div class="ttc" id="group__lavu__error_html_gae4bb6f165973d09584e0ec0f335f69ca"><div class="ttname"><a href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a></div><div class="ttdeci">#define AVERROR(e)</div><div class="ttdef"><b>Definition:</b> <a href="error_8h_source.html#l00043">error.h:43</a></div></div>
<div class="ttc" id="structbuffer__data_html_a9ca6d8ef5edd7f113c04c865f9367f8c"><div class="ttname"><a href="structbuffer__data.html#a9ca6d8ef5edd7f113c04c865f9367f8c">buffer_data::size</a></div><div class="ttdeci">size_t size</div><div class="ttdoc">size left in the buffer </div><div class="ttdef"><b>Definition:</b> <a href="avio__reading_8c_source.html#l00039">avio_reading.c:39</a></div></div>
<div class="ttc" id="common_8h_html_a0f84cbd7fd810cd678157c98cbfad4b0"><div class="ttname"><a href="common_8h.html#a0f84cbd7fd810cd678157c98cbfad4b0">FFMIN</a></div><div class="ttdeci">#define FFMIN(a, b)</div><div class="ttdef"><b>Definition:</b> <a href="common_8h_source.html#l00096">common.h:96</a></div></div>
<div class="ttc" id="group__lavu__error_html_gac4f6e109c242c81aeee21868d3f35e12"><div class="ttname"><a href="group__lavu__error.html#gac4f6e109c242c81aeee21868d3f35e12">av_err2str</a></div><div class="ttdeci">#define av_err2str(errnum)</div><div class="ttdoc">Convenience macro, the return value should be used only directly in function arguments but never stan...</div><div class="ttdef"><b>Definition:</b> <a href="error_8h_source.html#l00119">error.h:119</a></div></div>
<div class="ttc" id="structbuffer__data_html_a017ad9c72fdc7666c29841ddeefc8cd8"><div class="ttname"><a href="structbuffer__data.html#a017ad9c72fdc7666c29841ddeefc8cd8">buffer_data::ptr</a></div><div class="ttdeci">uint8_t * ptr</div><div class="ttdef"><b>Definition:</b> <a href="avio__reading_8c_source.html#l00038">avio_reading.c:38</a></div></div>
<div class="ttc" id="avio__reading_8c_html_a3a86bff38e7cb9093d0a32316b73b29c"><div class="ttname"><a href="avio__reading_8c.html#a3a86bff38e7cb9093d0a32316b73b29c">read_packet</a></div><div class="ttdeci">static int read_packet(void *opaque, uint8_t *buf, int buf_size)</div><div class="ttdef"><b>Definition:</b> <a href="avio__reading_8c_source.html#l00042">avio_reading.c:42</a></div></div>
<div class="ttc" id="avcodec_8h_html"><div class="ttname"><a href="avcodec_8h.html">avcodec.h</a></div><div class="ttdoc">Libavcodec external API header. </div></div>
<div class="ttc" id="structAVFormatContext_html_a1e7324262b6b78522e52064daaa7bc87"><div class="ttname"><a href="structAVFormatContext.html#a1e7324262b6b78522e52064daaa7bc87">AVFormatContext::pb</a></div><div class="ttdeci">AVIOContext * pb</div><div class="ttdoc">I/O context. </div><div class="ttdef"><b>Definition:</b> <a href="avformat_8h_source.html#l01356">avformat.h:1356</a></div></div>
<div class="ttc" id="avio__reading_8c_html_a0ddf1224851353fc92bfbff6f499fa97"><div class="ttname"><a href="avio__reading_8c.html#a0ddf1224851353fc92bfbff6f499fa97">main</a></div><div class="ttdeci">int main(int argc, char *argv[])</div><div class="ttdef"><b>Definition:</b> <a href="avio__reading_8c_source.html#l00057">avio_reading.c:57</a></div></div>
<div class="ttc" id="avformat_8h_html"><div class="ttname"><a href="avformat_8h.html">avformat.h</a></div><div class="ttdoc">Main libavformat public API header. </div></div>
<div class="ttc" id="group__lavf__decoding_html_gad42172e27cddafb81096939783b157bb"><div class="ttname"><a href="group__lavf__decoding.html#gad42172e27cddafb81096939783b157bb">avformat_find_stream_info</a></div><div class="ttdeci">int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)</div><div class="ttdoc">Read packets of a media file to get stream information. </div></div>
<div class="ttc" id="group__lavf__decoding_html_gae804b99aec044690162b8b9b110236a4"><div class="ttname"><a href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4">avformat_close_input</a></div><div class="ttdeci">void avformat_close_input(AVFormatContext **s)</div><div class="ttdoc">Close an opened input AVFormatContext. </div></div>
<div class="ttc" id="group__lavf__decoding_html_ga31d601155e9035d5b0e7efedc894ee49"><div class="ttname"><a href="group__lavf__decoding.html#ga31d601155e9035d5b0e7efedc894ee49">avformat_open_input</a></div><div class="ttdeci">int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)</div><div class="ttdoc">Open an input stream and read the header. </div></div>
<div class="ttc" id="structbuffer__data_html"><div class="ttname"><a href="structbuffer__data.html">buffer_data</a></div><div class="ttdef"><b>Definition:</b> <a href="avio__reading_8c_source.html#l00037">avio_reading.c:37</a></div></div>
<div class="ttc" id="group__lavf__core_html_ga917265caec45ef5a0646356ed1a507e3"><div class="ttname"><a href="group__lavf__core.html#ga917265caec45ef5a0646356ed1a507e3">av_register_all</a></div><div class="ttdeci">void av_register_all(void)</div><div class="ttdoc">Initialize libavformat and register all the muxers, demuxers and protocols. </div></div>
<div class="ttc" id="file_8h_html_a12e643af4a329ae6d1d567d8a782af1e"><div class="ttname"><a href="file_8h.html#a12e643af4a329ae6d1d567d8a782af1e">av_file_unmap</a></div><div class="ttdeci">void av_file_unmap(uint8_t *bufptr, size_t size)</div><div class="ttdoc">Unmap or free the buffer bufptr created by av_file_map(). </div></div>
<div class="ttc" id="file_8h_html_ade51c2ba717b70fab329362952906cfe"><div class="ttname"><a href="file_8h.html#ade51c2ba717b70fab329362952906cfe">av_file_map</a></div><div class="ttdeci">av_warn_unused_result int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, int log_offset, void *log_ctx)</div><div class="ttdoc">Read the file with name filename, and put its content in a newly allocated buffer or map it with mmap...</div></div>
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