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<li class="navelem"><a class="el" href="dir_8d855866ba5d436d839c7fc557836cd9.html">libavutil</a></li> </ul>
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<a href="threadmessage_8h.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"> * This file is part of FFmpeg.</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"> * FFmpeg is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * modify it under the terms of the GNU Lesser General Public License</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * as published by the Free Software Foundation; either</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * GNU Lesser General Public License for more details.</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"> * You should have received a copy of the GNU Lesser General Public License</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#ifndef AVUTIL_THREADMESSAGE_H</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_THREADMESSAGE_H</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"><a class="line" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af"> 22</a></span> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> <a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a>;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="threadmessage_8h.html#a7fb8bd4d2b779ab5e2044a1b5a5b22f5"> 24</a></span> <span class="keyword">typedef</span> <span class="keyword">enum</span> <a class="code" href="threadmessage_8h.html#a7fb8bd4d2b779ab5e2044a1b5a5b22f5">AVThreadMessageFlags</a> {</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"></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"> * Perform non-blocking operation.</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * If this flag is set, send and recv operations are non-blocking and</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * return AVERROR(EAGAIN) immediately if they can not proceed.</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"><a class="line" href="threadmessage_8h.html#a7fb8bd4d2b779ab5e2044a1b5a5b22f5adc72c40671a489c761960bafc41b1699"> 31</a></span>  <a class="code" href="threadmessage_8h.html#a7fb8bd4d2b779ab5e2044a1b5a5b22f5adc72c40671a489c761960bafc41b1699">AV_THREAD_MESSAGE_NONBLOCK</a> = 1,</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> } <a class="code" href="threadmessage_8h.html#a7fb8bd4d2b779ab5e2044a1b5a5b22f5">AVThreadMessageFlags</a>;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * Allocate a new message queue.</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * @param mq pointer to the message queue</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * @param nelem maximum number of elements in the queue</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * @param elsize size of each element in the queue</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * @return >=0 for success; <0 for error, in particular AVERROR(ENOSYS) if</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * lavu was built without thread support</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="keywordtype">int</span> <a class="code" href="threadmessage_8h.html#a1734b65da48a88e7c78e8a29b1eee139">av_thread_message_queue_alloc</a>(<a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> **mq,</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordtype">unsigned</span> nelem,</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordtype">unsigned</span> elsize);</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"></span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * Free a message queue.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * The message queue must no longer be in use by another thread.</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="keywordtype">void</span> <a class="code" href="threadmessage_8h.html#a95727669f1ebba16a6a49ea8b9f2276e">av_thread_message_queue_free</a>(<a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> **mq);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"></span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * Send a message on the queue.</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="keywordtype">int</span> <a class="code" href="threadmessage_8h.html#a873d588ed106d8dde339c4a16411e0b8">av_thread_message_queue_send</a>(<a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> *mq,</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordtype">void</span> *msg,</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordtype">unsigned</span> flags);</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * Receive a message from the queue.</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="keywordtype">int</span> <a class="code" href="threadmessage_8h.html#a0fb9f4909ad77c541f8ba4409b253111">av_thread_message_queue_recv</a>(<a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> *mq,</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordtype">void</span> *msg,</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordtype">unsigned</span> flags);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"></span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> * Set the sending error code.</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * If the error code is set to non-zero, av_thread_message_queue_recv() will</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> * return it immediately when there are no longer available messages.</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> * Conventional values, such as AVERROR_EOF or AVERROR(EAGAIN), can be used</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> * to cause the receiving thread to stop or suspend its operation.</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keywordtype">void</span> <a class="code" href="threadmessage_8h.html#a01981ed85e713e682912ee6e063403ad">av_thread_message_queue_set_err_send</a>(<a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> *mq,</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordtype">int</span> err);</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"></span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * Set the receiving error code.</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * If the error code is set to non-zero, av_thread_message_queue_send() will</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * return it immediately. Conventional values, such as AVERROR_EOF or</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * AVERROR(EAGAIN), can be used to cause the sending thread to stop or</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * suspend its operation.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="keywordtype">void</span> <a class="code" href="threadmessage_8h.html#a6b2b6c47728e7d442b31a49ca8f9f971">av_thread_message_queue_set_err_recv</a>(<a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> *mq,</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordtype">int</span> err);</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"></span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * Set the optional free message callback function which will be called if an</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> * operation is removing messages from the queue.</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="keywordtype">void</span> <a class="code" href="threadmessage_8h.html#a55878238c793830dc7de601042873ee6">av_thread_message_queue_set_free_func</a>(<a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> *mq,</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordtype">void</span> (*free_func)(<span class="keywordtype">void</span> *msg));</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"></span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> * Flush the message queue</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * This function is mostly equivalent to reading and free-ing every message</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * except that it will be done in a single operation (no lock/unlock between</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * reads).</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="keywordtype">void</span> <a class="code" href="threadmessage_8h.html#a8dc5df5158d3098303cdd48e7e3d4ea4">av_thread_message_flush</a>(<a class="code" href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a> *mq);</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_THREADMESSAGE_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="threadmessage_8h_html_a01981ed85e713e682912ee6e063403ad"><div class="ttname"><a href="threadmessage_8h.html#a01981ed85e713e682912ee6e063403ad">av_thread_message_queue_set_err_send</a></div><div class="ttdeci">void av_thread_message_queue_set_err_send(AVThreadMessageQueue *mq, int err)</div><div class="ttdoc">Set the sending error code. </div></div>
<div class="ttc" id="threadmessage_8h_html_a873d588ed106d8dde339c4a16411e0b8"><div class="ttname"><a href="threadmessage_8h.html#a873d588ed106d8dde339c4a16411e0b8">av_thread_message_queue_send</a></div><div class="ttdeci">int av_thread_message_queue_send(AVThreadMessageQueue *mq, void *msg, unsigned flags)</div><div class="ttdoc">Send a message on the queue. </div></div>
<div class="ttc" id="threadmessage_8h_html_a8dc5df5158d3098303cdd48e7e3d4ea4"><div class="ttname"><a href="threadmessage_8h.html#a8dc5df5158d3098303cdd48e7e3d4ea4">av_thread_message_flush</a></div><div class="ttdeci">void av_thread_message_flush(AVThreadMessageQueue *mq)</div><div class="ttdoc">Flush the message queue. </div></div>
<div class="ttc" id="threadmessage_8h_html_a6b2b6c47728e7d442b31a49ca8f9f971"><div class="ttname"><a href="threadmessage_8h.html#a6b2b6c47728e7d442b31a49ca8f9f971">av_thread_message_queue_set_err_recv</a></div><div class="ttdeci">void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq, int err)</div><div class="ttdoc">Set the receiving error code. </div></div>
<div class="ttc" id="threadmessage_8h_html_a55878238c793830dc7de601042873ee6"><div class="ttname"><a href="threadmessage_8h.html#a55878238c793830dc7de601042873ee6">av_thread_message_queue_set_free_func</a></div><div class="ttdeci">void av_thread_message_queue_set_free_func(AVThreadMessageQueue *mq, void(*free_func)(void *msg))</div><div class="ttdoc">Set the optional free message callback function which will be called if an operation is removing mess...</div></div>
<div class="ttc" id="threadmessage_8h_html_a95727669f1ebba16a6a49ea8b9f2276e"><div class="ttname"><a href="threadmessage_8h.html#a95727669f1ebba16a6a49ea8b9f2276e">av_thread_message_queue_free</a></div><div class="ttdeci">void av_thread_message_queue_free(AVThreadMessageQueue **mq)</div><div class="ttdoc">Free a message queue. </div></div>
<div class="ttc" id="threadmessage_8h_html_a0fb9f4909ad77c541f8ba4409b253111"><div class="ttname"><a href="threadmessage_8h.html#a0fb9f4909ad77c541f8ba4409b253111">av_thread_message_queue_recv</a></div><div class="ttdeci">int av_thread_message_queue_recv(AVThreadMessageQueue *mq, void *msg, unsigned flags)</div><div class="ttdoc">Receive a message from the queue. </div></div>
<div class="ttc" id="threadmessage_8h_html_a1734b65da48a88e7c78e8a29b1eee139"><div class="ttname"><a href="threadmessage_8h.html#a1734b65da48a88e7c78e8a29b1eee139">av_thread_message_queue_alloc</a></div><div class="ttdeci">int av_thread_message_queue_alloc(AVThreadMessageQueue **mq, unsigned nelem, unsigned elsize)</div><div class="ttdoc">Allocate a new message queue. </div></div>
<div class="ttc" id="threadmessage_8h_html_a7fb8bd4d2b779ab5e2044a1b5a5b22f5adc72c40671a489c761960bafc41b1699"><div class="ttname"><a href="threadmessage_8h.html#a7fb8bd4d2b779ab5e2044a1b5a5b22f5adc72c40671a489c761960bafc41b1699">AV_THREAD_MESSAGE_NONBLOCK</a></div><div class="ttdoc">Perform non-blocking operation. </div><div class="ttdef"><b>Definition:</b> <a href="threadmessage_8h_source.html#l00031">threadmessage.h:31</a></div></div>
<div class="ttc" id="threadmessage_8h_html_a7fb8bd4d2b779ab5e2044a1b5a5b22f5"><div class="ttname"><a href="threadmessage_8h.html#a7fb8bd4d2b779ab5e2044a1b5a5b22f5">AVThreadMessageFlags</a></div><div class="ttdeci">AVThreadMessageFlags</div><div class="ttdef"><b>Definition:</b> <a href="threadmessage_8h_source.html#l00024">threadmessage.h:24</a></div></div>
<div class="ttc" id="threadmessage_8h_html_afe2b529ed869d4b672f1a4547dd160af"><div class="ttname"><a href="threadmessage_8h.html#afe2b529ed869d4b672f1a4547dd160af">AVThreadMessageQueue</a></div><div class="ttdeci">struct AVThreadMessageQueue AVThreadMessageQueue</div><div class="ttdef"><b>Definition:</b> <a href="threadmessage_8h_source.html#l00022">threadmessage.h:22</a></div></div>
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