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<div class="title">libswresample/swresample.h File Reference<div class="ingroups"><a class="el" href="group__lswr.html">Libswresample</a></div></div> </div>
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<p>libswresample public header
<a href="#details">More...</a></p>
<div class="textblock"><code>#include <stdint.h></code><br/>
<code>#include "<a class="el" href="frame_8h_source.html">libavutil/frame.h</a>"</code><br/>
<code>#include "<a class="el" href="samplefmt_8h_source.html">libavutil/samplefmt.h</a>"</code><br/>
<code>#include "<a class="el" href="libswresample_2version_8h_source.html">libswresample/version.h</a>"</code><br/>
</div>
<p><a href="swresample_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="typedef-members"></a>
Typedefs</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The libswresample context. <a href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structAVClass.html">AVClass</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga6ca0298348b382cf0fe67d7f339a17f3">swr_get_class</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> for SwrContext. <a href="group__lswr.html#ga6ca0298348b382cf0fe67d7f339a17f3"></a><br/></td></tr>
<tr><td colspan="2"><div class="groupHeader">SwrContext constructor functions</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gaf58c4ff10f73d74bdab8e5aa7193147c">swr_alloc</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate SwrContext. <a href="group__lswr.html#gaf58c4ff10f73d74bdab8e5aa7193147c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67">swr_init</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Initialize context after user parameters have been set. <a href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gab11b02705e97404b6d74b18b2fcfdfcf">swr_is_initialized</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Check whether an swr context has been initialized or not. <a href="group__lswr.html#gab11b02705e97404b6d74b18b2fcfdfcf"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gad7f29022726c871aadf935281a9813bc">swr_alloc_set_opts</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int64_t out_ch_layout, enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> out_sample_fmt, int out_sample_rate, int64_t in_ch_layout, enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> in_sample_fmt, int in_sample_rate, int log_offset, void *log_ctx)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate SwrContext if needed and set/reset common parameters. <a href="group__lswr.html#gad7f29022726c871aadf935281a9813bc"></a><br/></td></tr>
<tr><td colspan="2"><div class="groupHeader">SwrContext destructor functions</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34">swr_free</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> **s)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Free the given SwrContext and set the pointer to NULL. <a href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gaa4bf1048740dfc08d68aba9f1b4db22e">swr_close</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Closes the context so that <a class="el" href="group__lswr.html#gab11b02705e97404b6d74b18b2fcfdfcf" title="Check whether an swr context has been initialized or not.">swr_is_initialized()</a> returns 0. <a href="group__lswr.html#gaa4bf1048740dfc08d68aba9f1b4db22e"></a><br/></td></tr>
<tr><td colspan="2"><div class="groupHeader">Core conversion functions</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a">swr_convert</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, uint8_t **out, int out_count, const uint8_t **in, int in_count)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert audio. <a href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gaad9811626c6c01a241f6bf46aff27333">swr_next_pts</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int64_t <a class="el" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7">pts</a>)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert the next timestamp from input to output timestamps are in 1/(in_sample_rate * out_sample_rate) units. <a href="group__lswr.html#gaad9811626c6c01a241f6bf46aff27333"></a><br/></td></tr>
<tr><td colspan="2"><div class="groupHeader">Low-level option setting functions</div></td></tr>
<tr><td colspan="2"><div class="groupText"><p>These functons provide a means to set low-level options that is not possible with the <a class="el" href="structAVOption.html" title="AVOption.">AVOption</a> API. </p>
</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gab7f21690522b85d7757e13fa9853d4d8">swr_set_compensation</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int sample_delta, int compensation_distance)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Activate resampling compensation ("soft" compensation). <a href="group__lswr.html#gab7f21690522b85d7757e13fa9853d4d8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga1b528050b5f5b704aecbfbc257a17ef0">swr_set_channel_mapping</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, const int *channel_map)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set a customized input channel mapping. <a href="group__lswr.html#ga1b528050b5f5b704aecbfbc257a17ef0"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gaf9064d65b1e654dc78f7d6bcd2e8c747">swr_set_matrix</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, const double *matrix, int stride)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set a customized remix matrix. <a href="group__lswr.html#gaf9064d65b1e654dc78f7d6bcd2e8c747"></a><br/></td></tr>
<tr><td colspan="2"><div class="groupHeader">Sample handling functions</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga43d7ba4507891fc25aacbbea5cdfb065">swr_drop_output</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int count)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Drops the specified number of output samples. <a href="group__lswr.html#ga43d7ba4507891fc25aacbbea5cdfb065"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga4733ed4779ed3e30379de2a6ef8de837">swr_inject_silence</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int count)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Injects the specified number of silence samples. <a href="group__lswr.html#ga4733ed4779ed3e30379de2a6ef8de837"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga5121a5a7890a2d23b72dc871dd0ebb06">swr_get_delay</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int64_t base)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Gets the delay the next input sample will experience relative to the next output sample. <a href="group__lswr.html#ga5121a5a7890a2d23b72dc871dd0ebb06"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga97a8d5f6abe3bcdfb6072412f17285a4">swr_get_out_samples</a> (struct <a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *s, int in_samples)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Find an upper bound on the number of samples that the next swr_convert call will output, if called with in_samples of input samples. <a href="group__lswr.html#ga97a8d5f6abe3bcdfb6072412f17285a4"></a><br/></td></tr>
<tr><td colspan="2"><div class="groupHeader">Configuration accessors</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">unsigned </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gaed39c2153a1e26b4ef656ec8c765a2e3">swresample_version</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the <a class="el" href="libswresample_2version_8h.html#a6172452a08ba6386e2265bd34769982b">LIBSWRESAMPLE_VERSION_INT</a> constant. <a href="group__lswr.html#gaed39c2153a1e26b4ef656ec8c765a2e3"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gad602fde7a824753d5adc57e7f1372e27">swresample_configuration</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the swr build-time configuration. <a href="group__lswr.html#gad602fde7a824753d5adc57e7f1372e27"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga29c5657b18632e206a99d1ae27225499">swresample_license</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the swr license. <a href="group__lswr.html#ga29c5657b18632e206a99d1ae27225499"></a><br/></td></tr>
<tr><td colspan="2"><div class="groupHeader">AVFrame based API</div></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#gac482028c01d95580106183aa84b0930c">swr_convert_frame</a> (<a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *swr, <a class="el" href="structAVFrame.html">AVFrame</a> *output, const <a class="el" href="structAVFrame.html">AVFrame</a> *input)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert the samples in the input <a class="el" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> and write them to the output <a class="el" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a>. <a href="group__lswr.html#gac482028c01d95580106183aa84b0930c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga73ade2cf6934765cf518c6c917b77c76">swr_config_frame</a> (<a class="el" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *swr, const <a class="el" href="structAVFrame.html">AVFrame</a> *out, const <a class="el" href="structAVFrame.html">AVFrame</a> *in)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Configure or reconfigure the SwrContext using the information provided by the AVFrames. <a href="group__lswr.html#ga73ade2cf6934765cf518c6c917b77c76"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="member-group"></a>
Option constants</h2></td></tr>
<tr><td class="ititle" colspan="2"><p><a class="anchor" id="amgrpa7f26de0633f7745117b919eca2482d2"></a>These constants are used for the <a class="el" href="group__avoptions.html">AVOptions</a> interface for lswr. </p>
</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga2226aca7f49137f3f29b6f731a985916">SWR_FLAG_RESAMPLE</a>   1</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Force resampling even if equal sample rate. <a href="group__lswr.html#ga2226aca7f49137f3f29b6f731a985916"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga387e613b19e5269a46d9ff1a5ee3fcd4">SwrDitherType</a> { <br/>
  <a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4afacc17a82581598f762a8036ba559836">SWR_DITHER_NONE</a> = 0,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a0fec2dd28b1357b50e9807ca6ecee83a">SWR_DITHER_RECTANGULAR</a>,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae4635dc355dc680eeb211e7af17ddfd2">SWR_DITHER_TRIANGULAR</a>,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a91276f2e437aa9d0d8bdffabe24f5532">SWR_DITHER_TRIANGULAR_HIGHPASS</a>,
<br/>
  <a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae6858a54f5b2e1bffa9aaef20b2593c0">SWR_DITHER_NS</a> = 64,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a6f6072071262f7f05a52057cfe48df87">SWR_DITHER_NS_LIPSHITZ</a>,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae197d7fc5592652aaa8edf1067c56af9">SWR_DITHER_NS_F_WEIGHTED</a>,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4a60eeb8ca5de47916a81f2c3a6534eed4">SWR_DITHER_NS_MODIFIED_E_WEIGHTED</a>,
<br/>
  <a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ad13d2ff2831d463eb46ca4c46dfec7b0">SWR_DITHER_NS_IMPROVED_E_WEIGHTED</a>,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ae3aba4bf43c2210a148b11c0215b5d24">SWR_DITHER_NS_SHIBATA</a>,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4af275c21089abbf78a6623544f34d76f9">SWR_DITHER_NS_LOW_SHIBATA</a>,
<a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4ac569828a706ccf22a8d5810c973c8f17">SWR_DITHER_NS_HIGH_SHIBATA</a>,
<br/>
  <a class="el" href="group__lswr.html#gga387e613b19e5269a46d9ff1a5ee3fcd4aacbdf2f91bb14cf390116492115fb8ea">SWR_DITHER_NB</a>
<br/>
}</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Dithering algorithms. <a href="group__lswr.html#ga387e613b19e5269a46d9ff1a5ee3fcd4">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga87f9e023bbe780d3ccf17dfc7abed580">SwrEngine</a> { <a class="el" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a11652db5af0c279d79deba1c577c9729">SWR_ENGINE_SWR</a>,
<a class="el" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a2933f5b0b96829095a04a8acd19b27e7">SWR_ENGINE_SOXR</a>,
<a class="el" href="group__lswr.html#gga87f9e023bbe780d3ccf17dfc7abed580a865af2e70ebb85b3cafb93f1854dbef9">SWR_ENGINE_NB</a>
}</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resampling Engines. <a href="group__lswr.html#ga87f9e023bbe780d3ccf17dfc7abed580">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lswr.html#ga2176b2a3a8b809788f6e7ccdc238b6be">SwrFilterType</a> { <a class="el" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea1a6413b9888bac851e2ee4f991f01d0c">SWR_FILTER_TYPE_CUBIC</a>,
<a class="el" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea17f5dd4512b4abc2285905293a81cf55">SWR_FILTER_TYPE_BLACKMAN_NUTTALL</a>,
<a class="el" href="group__lswr.html#gga2176b2a3a8b809788f6e7ccdc238b6bea8f492a5dc94b6e41a37f190c5492bf3f">SWR_FILTER_TYPE_KAISER</a>
}</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resampling Filter Types. <a href="group__lswr.html#ga2176b2a3a8b809788f6e7ccdc238b6be">More...</a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>libswresample public header </p>
<p>Definition in file <a class="el" href="swresample_8h_source.html">swresample.h</a>.</p>
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