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 <span id="projectnumber">2.7.1</span>
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<a href="#typedef-members">Typedefs</a> |
<a href="#func-members">Functions</a> </div>
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<div class="title">Audio resampling</div> </div>
<div class="ingroups"><a class="el" href="group__libavc.html">Encoding/Decoding Library</a></div></div><!--header-->
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<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__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a></td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> <br class="typebreak"/>
<a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__resample.html#ga6837453b6819cf2f4d26c2d320b1d696">av_audio_resample_init</a> (int output_channels, int input_channels, int output_rate, int input_rate, enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> sample_fmt_out, enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> sample_fmt_in, int filter_length, int log2_phase_count, int linear, double cutoff)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Initialize audio resampling context. <a href="#ga6837453b6819cf2f4d26c2d320b1d696"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__resample.html#ga4a2391f7d72287f478ae9dfc0ae373f4">audio_resample</a> (<a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a> *s, short *output, short *input, int nb_samples)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__resample.html#ga06447648458074fba375b9cc069664e0">audio_resample_close</a> (<a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a> *s)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Free resample context. <a href="#ga06447648458074fba375b9cc069664e0"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> struct <br class="typebreak"/>
AVResampleContext * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__resample.html#ga9f11d551d458bb904e1078c65121fe03">av_resample_init</a> (int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Initialize an audio resampler. <a href="#ga9f11d551d458bb904e1078c65121fe03"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__resample.html#gaced5571eafa8e23a25b96e1755f8f65c">av_resample</a> (struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resample an array of samples using a previously configured context. <a href="#gaced5571eafa8e23a25b96e1755f8f65c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__resample.html#gadf6acc7cdbbf2fe8d6a7990a22662c0b">av_resample_compensate</a> (struct AVResampleContext *c, int sample_delta, int compensation_distance)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Compensate samplerate/timestamp drift. <a href="#gadf6acc7cdbbf2fe8d6a7990a22662c0b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__resample.html#ga2901688d58c5a64b97436288b301ad18">av_resample_close</a> (struct AVResampleContext *c)</td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000020">Deprecated:</a></b></dt><dd>use libswresample instead</dd></dl>
<hr/><h2>Typedef Documentation</h2>
<a class="anchor" id="ga0051f36cfec3437423a131c085ff5ea2"></a><!-- doxytag: member="avcodec.h::ReSampleContext" ref="ga0051f36cfec3437423a131c085ff5ea2" args="" -->
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<td class="memname">typedef struct <a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a> <a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a></td>
</tr>
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<div class="memdoc">
<p>Definition at line <a class="el" href="libavcodec_2avcodec_8h_source.html#l04663">4663</a> of file <a class="el" href="libavcodec_2avcodec_8h_source.html">avcodec.h</a>.</p>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga6837453b6819cf2f4d26c2d320b1d696"></a><!-- doxytag: member="avcodec.h::av_audio_resample_init" ref="ga6837453b6819cf2f4d26c2d320b1d696" args="(int output_channels, int input_channels, int output_rate, int input_rate, enum AVSampleFormat sample_fmt_out, enum AVSampleFormat sample_fmt_in, int filter_length, int log2_phase_count, int linear, double cutoff)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> <a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a>* <a class="el" href="group__lavc__resample.html#ga6837453b6819cf2f4d26c2d320b1d696">av_audio_resample_init</a> </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>output_channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>input_channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>output_rate</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>input_rate</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> </td>
<td class="paramname"><em>sample_fmt_out</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> </td>
<td class="paramname"><em>sample_fmt_in</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>filter_length</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>log2_phase_count</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>linear</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>cutoff</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Initialize audio resampling context. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">output_channels</td><td>number of output channels </td></tr>
<tr><td class="paramname">input_channels</td><td>number of input channels </td></tr>
<tr><td class="paramname">output_rate</td><td>output sample rate </td></tr>
<tr><td class="paramname">input_rate</td><td>input sample rate </td></tr>
<tr><td class="paramname">sample_fmt_out</td><td>requested output sample format </td></tr>
<tr><td class="paramname">sample_fmt_in</td><td>input sample format </td></tr>
<tr><td class="paramname">filter_length</td><td>length of each FIR filter in the filterbank relative to the cutoff frequency </td></tr>
<tr><td class="paramname">log2_phase_count</td><td>log2 of the number of entries in the polyphase filterbank </td></tr>
<tr><td class="paramname">linear</td><td>if 1 then the used FIR filter will be linearly interpolated between the 2 closest, if 0 the closest will be used </td></tr>
<tr><td class="paramname">cutoff</td><td>cutoff frequency, 1.0 corresponds to half the output sampling rate </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>allocated ReSampleContext, NULL if error occurred </dd></dl>
</div>
</div>
<a class="anchor" id="ga4a2391f7d72287f478ae9dfc0ae373f4"></a><!-- doxytag: member="avcodec.h::audio_resample" ref="ga4a2391f7d72287f478ae9dfc0ae373f4" args="(ReSampleContext *s, short *output, short *input, int nb_samples)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> int <a class="el" href="group__lavc__resample.html#ga4a2391f7d72287f478ae9dfc0ae373f4">audio_resample</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">short * </td>
<td class="paramname"><em>output</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">short * </td>
<td class="paramname"><em>input</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>nb_samples</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
</div>
<a class="anchor" id="ga06447648458074fba375b9cc069664e0"></a><!-- doxytag: member="avcodec.h::audio_resample_close" ref="ga06447648458074fba375b9cc069664e0" args="(ReSampleContext *s)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void <a class="el" href="group__lavc__resample.html#ga06447648458074fba375b9cc069664e0">audio_resample_close</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__resample.html#ga0051f36cfec3437423a131c085ff5ea2">ReSampleContext</a> * </td>
<td class="paramname"><em>s</em></td><td>)</td>
<td></td>
</tr>
</table>
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<div class="memdoc">
<p>Free resample context. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">s</td><td>a non-NULL pointer to a resample context previously created with <a class="el" href="group__lavc__resample.html#ga6837453b6819cf2f4d26c2d320b1d696" title="Initialize audio resampling context.">av_audio_resample_init()</a> </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga9f11d551d458bb904e1078c65121fe03"></a><!-- doxytag: member="avcodec.h::av_resample_init" ref="ga9f11d551d458bb904e1078c65121fe03" args="(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> struct AVResampleContext* <a class="el" href="group__lavc__resample.html#ga9f11d551d458bb904e1078c65121fe03">av_resample_init</a> </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>out_rate</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>in_rate</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>filter_length</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>log2_phase_count</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>linear</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>cutoff</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [read]</code></td>
</tr>
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<div class="memdoc">
<p>Initialize an audio resampler. </p>
<p>Note, if either rate is not an integer then simply scale both rates up so they are. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">filter_length</td><td>length of each FIR filter in the filterbank relative to the cutoff freq </td></tr>
<tr><td class="paramname">log2_phase_count</td><td>log2 of the number of entries in the polyphase filterbank </td></tr>
<tr><td class="paramname">linear</td><td>If 1 then the used FIR filter will be linearly interpolated between the 2 closest, if 0 the closest will be used </td></tr>
<tr><td class="paramname">cutoff</td><td>cutoff frequency, 1.0 corresponds to half the output sampling rate </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="gaced5571eafa8e23a25b96e1755f8f65c"></a><!-- doxytag: member="avcodec.h::av_resample" ref="gaced5571eafa8e23a25b96e1755f8f65c" args="(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> int <a class="el" href="group__lavc__resample.html#gaced5571eafa8e23a25b96e1755f8f65c">av_resample</a> </td>
<td>(</td>
<td class="paramtype">struct AVResampleContext * </td>
<td class="paramname"><em>c</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">short * </td>
<td class="paramname"><em>dst</em>, </td>
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<td class="paramtype">short * </td>
<td class="paramname"><em>src</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"><em>consumed</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>src_size</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>dst_size</em>, </td>
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<td class="paramname"><em>update_ctx</em> </td>
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<p>Resample an array of samples using a previously configured context. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">src</td><td>an array of unconsumed samples </td></tr>
<tr><td class="paramname">consumed</td><td>the number of samples of src which have been consumed are returned here </td></tr>
<tr><td class="paramname">src_size</td><td>the number of unconsumed samples available </td></tr>
<tr><td class="paramname">dst_size</td><td>the amount of space in samples available in dst </td></tr>
<tr><td class="paramname">update_ctx</td><td>If this is 0 then the context will not be modified, that way several channels can be resampled with the same context. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the number of samples written in dst or -1 if an error occurred </dd></dl>
</div>
</div>
<a class="anchor" id="gadf6acc7cdbbf2fe8d6a7990a22662c0b"></a><!-- doxytag: member="avcodec.h::av_resample_compensate" ref="gadf6acc7cdbbf2fe8d6a7990a22662c0b" args="(struct AVResampleContext *c, int sample_delta, int compensation_distance)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void <a class="el" href="group__lavc__resample.html#gadf6acc7cdbbf2fe8d6a7990a22662c0b">av_resample_compensate</a> </td>
<td>(</td>
<td class="paramtype">struct AVResampleContext * </td>
<td class="paramname"><em>c</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>sample_delta</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>compensation_distance</em> </td>
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<td>)</td>
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<p>Compensate samplerate/timestamp drift. </p>
<p>The compensation is done by changing the resampler parameters, so no audible clicks or similar distortions occur </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">compensation_distance</td><td>distance in output samples over which the compensation should be performed </td></tr>
<tr><td class="paramname">sample_delta</td><td>number of output samples which should be output less</td></tr>
</table>
</dd>
</dl>
<p>example: av_resample_compensate(c, 10, 500) here instead of 510 samples only 500 samples would be output</p>
<p>note, due to rounding the actual compensation might be slightly different, especially if the compensation_distance is large and the in_rate used during init is small </p>
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<a class="anchor" id="ga2901688d58c5a64b97436288b301ad18"></a><!-- doxytag: member="avcodec.h::av_resample_close" ref="ga2901688d58c5a64b97436288b301ad18" args="(struct AVResampleContext *c)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void <a class="el" href="group__lavc__resample.html#ga2901688d58c5a64b97436288b301ad18">av_resample_close</a> </td>
<td>(</td>
<td class="paramtype">struct AVResampleContext * </td>
<td class="paramname"><em>c</em></td><td>)</td>
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