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<a href="#typedef-members">Typedefs</a> |
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">Audio FIFO Buffer</div> </div>
<div class="ingroups"><a class="el" href="group__lavu__audio.html">Audio related</a></div></div><!--header-->
<div class="contents">
<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__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Context for an Audio FIFO Buffer. <a href="#ga328abb21e9abb2c455d2d9c212d5230f"></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">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#ga74e029e47f7aa99217ad1f315c434875">av_audio_fifo_free</a> (<a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *af)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Free an AVAudioFifo. <a href="#ga74e029e47f7aa99217ad1f315c434875"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#ga9d792394f0615a329aec47847f8f8784">av_audio_fifo_alloc</a> (enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> sample_fmt, int channels, int nb_samples)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate an AVAudioFifo. <a href="#ga9d792394f0615a329aec47847f8f8784"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#gae34e4eb0928f8e4539730d8c044c6139">av_audio_fifo_realloc</a> (<a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *af, int nb_samples)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reallocate an AVAudioFifo. <a href="#gae34e4eb0928f8e4539730d8c044c6139"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#ga0e7fadeea09c52a96eb4082a9e169bb4">av_audio_fifo_write</a> (<a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *af, void **data, int nb_samples)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Write data to an AVAudioFifo. <a href="#ga0e7fadeea09c52a96eb4082a9e169bb4"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#gab256fc29188d91311bd2fbd78eb356af">av_audio_fifo_read</a> (<a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *af, void **data, int nb_samples)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Read data from an AVAudioFifo. <a href="#gab256fc29188d91311bd2fbd78eb356af"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#gacac9b187b9c27c5a0374f6f83224a77b">av_audio_fifo_drain</a> (<a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *af, int nb_samples)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Drain data from an AVAudioFifo. <a href="#gacac9b187b9c27c5a0374f6f83224a77b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#ga3f070386d11d425302437a3b60fc5dd0">av_audio_fifo_reset</a> (<a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *af)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reset the AVAudioFifo buffer. <a href="#ga3f070386d11d425302437a3b60fc5dd0"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b">av_audio_fifo_size</a> (<a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *af)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current number of samples in the AVAudioFifo available for reading. <a href="#gaa0a4742ecac52a999e8b4478d27f3b9b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavu__audiofifo.html#ga2bed2f01fe34228ee8a73617b3177d00">av_audio_fifo_space</a> (<a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *af)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the current number of samples in the AVAudioFifo available for writing. <a href="#ga2bed2f01fe34228ee8a73617b3177d00"></a><br/></td></tr>
</table>
<hr/><h2>Typedef Documentation</h2>
<a class="anchor" id="ga328abb21e9abb2c455d2d9c212d5230f"></a><!-- doxytag: member="audio_fifo.h::AVAudioFifo" ref="ga328abb21e9abb2c455d2d9c212d5230f" args="" -->
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<td class="memname">typedef struct <a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> <a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Context for an Audio FIFO Buffer. </p>
<ul>
<li>Operates at the sample level rather than the byte level.</li>
<li>Supports multiple channels with either planar or packed sample format.</li>
<li>Automatic reallocation when writing to a full buffer. </li>
</ul>
<p>Definition at line <a class="el" href="audio__fifo_8h_source.html#l00049">49</a> of file <a class="el" href="audio__fifo_8h_source.html">audio_fifo.h</a>.</p>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga74e029e47f7aa99217ad1f315c434875"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_free" ref="ga74e029e47f7aa99217ad1f315c434875" args="(AVAudioFifo *af)" -->
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<td class="memname">void <a class="el" href="group__lavu__audiofifo.html#ga74e029e47f7aa99217ad1f315c434875">av_audio_fifo_free</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td>
<td class="paramname"><em>af</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Free an AVAudioFifo. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">af</td><td>AVAudioFifo to free </td></tr>
</table>
</dd>
</dl>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="transcode_aac_8c-example.html#a93">transcode_aac.c</a>.</dd>
</dl>
<p>Referenced by <a class="el" href="transcode__aac_8c_source.html#l00649">main()</a>.</p>
</div>
</div>
<a class="anchor" id="ga9d792394f0615a329aec47847f8f8784"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_alloc" ref="ga9d792394f0615a329aec47847f8f8784" args="(enum AVSampleFormat sample_fmt, int channels, int nb_samples)" -->
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<div class="memproto">
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<td class="memname"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a>* <a class="el" href="group__lavu__audiofifo.html#ga9d792394f0615a329aec47847f8f8784">av_audio_fifo_alloc</a> </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</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>channels</em>, </td>
</tr>
<tr>
<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>
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<div class="memdoc">
<p>Allocate an AVAudioFifo. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">sample_fmt</td><td>sample format </td></tr>
<tr><td class="paramname">channels</td><td>number of channels </td></tr>
<tr><td class="paramname">nb_samples</td><td>initial allocation size, in samples </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>newly allocated AVAudioFifo, or NULL on error </dd></dl>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="transcode_aac_8c-example.html#a55">transcode_aac.c</a>.</dd>
</dl>
<p>Referenced by <a class="el" href="transcode__aac_8c_source.html#l00279">init_fifo()</a>.</p>
</div>
</div>
<a class="anchor" id="gae34e4eb0928f8e4539730d8c044c6139"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_realloc" ref="gae34e4eb0928f8e4539730d8c044c6139" args="(AVAudioFifo *af, int nb_samples)" -->
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<td class="memname">int <a class="el" href="group__lavu__audiofifo.html#gae34e4eb0928f8e4539730d8c044c6139">av_audio_fifo_realloc</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td>
<td class="paramname"><em>af</em>, </td>
</tr>
<tr>
<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">
<p>Reallocate an AVAudioFifo. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">af</td><td>AVAudioFifo to reallocate </td></tr>
<tr><td class="paramname">nb_samples</td><td>new allocation size, in samples </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 if OK, or negative AVERROR code on failure </dd></dl>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="transcode_aac_8c-example.html#a69">transcode_aac.c</a>.</dd>
</dl>
<p>Referenced by <a class="el" href="transcode__aac_8c_source.html#l00413">add_samples_to_fifo()</a>.</p>
</div>
</div>
<a class="anchor" id="ga0e7fadeea09c52a96eb4082a9e169bb4"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_write" ref="ga0e7fadeea09c52a96eb4082a9e169bb4" args="(AVAudioFifo *af, void **data, int nb_samples)" -->
<div class="memitem">
<div class="memproto">
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<td class="memname">int <a class="el" href="group__lavu__audiofifo.html#ga0e7fadeea09c52a96eb4082a9e169bb4">av_audio_fifo_write</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td>
<td class="paramname"><em>af</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void ** </td>
<td class="paramname"><em>data</em>, </td>
</tr>
<tr>
<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">
<p>Write data to an AVAudioFifo. </p>
<p>The AVAudioFifo will be reallocated automatically if the available space is less than nb_samples.</p>
<dl class="see"><dt><b>See also:</b></dt><dd>enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> The documentation for <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> describes the data layout.</dd></dl>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">af</td><td>AVAudioFifo to write to </td></tr>
<tr><td class="paramname">data</td><td>audio data plane pointers </td></tr>
<tr><td class="paramname">nb_samples</td><td>number of samples to write </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>number of samples actually written, or negative AVERROR code on failure. If successful, the number of samples actually written will always be nb_samples. </dd></dl>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="transcode_aac_8c-example.html#a71">transcode_aac.c</a>.</dd>
</dl>
<p>Referenced by <a class="el" href="transcode__aac_8c_source.html#l00413">add_samples_to_fifo()</a>.</p>
</div>
</div>
<a class="anchor" id="gab256fc29188d91311bd2fbd78eb356af"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_read" ref="gab256fc29188d91311bd2fbd78eb356af" args="(AVAudioFifo *af, void **data, int nb_samples)" -->
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<td class="memname">int <a class="el" href="group__lavu__audiofifo.html#gab256fc29188d91311bd2fbd78eb356af">av_audio_fifo_read</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td>
<td class="paramname"><em>af</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void ** </td>
<td class="paramname"><em>data</em>, </td>
</tr>
<tr>
<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>
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<div class="memdoc">
<p>Read data from an AVAudioFifo. </p>
<dl class="see"><dt><b>See also:</b></dt><dd>enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> The documentation for <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> describes the data layout.</dd></dl>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">af</td><td>AVAudioFifo to read from </td></tr>
<tr><td class="paramname">data</td><td>audio data plane pointers </td></tr>
<tr><td class="paramname">nb_samples</td><td>number of samples to read </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>number of samples actually read, or negative AVERROR code on failure. The number of samples actually read will not be greater than nb_samples, and will only be less than nb_samples if av_audio_fifo_size is less than nb_samples. </dd></dl>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="transcode_aac_8c-example.html#a87">transcode_aac.c</a>.</dd>
</dl>
<p>Referenced by <a class="el" href="transcode__aac_8c_source.html#l00597">load_encode_and_write()</a>.</p>
</div>
</div>
<a class="anchor" id="gacac9b187b9c27c5a0374f6f83224a77b"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_drain" ref="gacac9b187b9c27c5a0374f6f83224a77b" args="(AVAudioFifo *af, int nb_samples)" -->
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<td class="memname">int <a class="el" href="group__lavu__audiofifo.html#gacac9b187b9c27c5a0374f6f83224a77b">av_audio_fifo_drain</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td>
<td class="paramname"><em>af</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>nb_samples</em> </td>
</tr>
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<td></td>
<td>)</td>
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<div class="memdoc">
<p>Drain data from an AVAudioFifo. </p>
<p>Removes the data without reading it.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">af</td><td>AVAudioFifo to drain </td></tr>
<tr><td class="paramname">nb_samples</td><td>number of samples to drain </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>0 if OK, or negative AVERROR code on failure </dd></dl>
</div>
</div>
<a class="anchor" id="ga3f070386d11d425302437a3b60fc5dd0"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_reset" ref="ga3f070386d11d425302437a3b60fc5dd0" args="(AVAudioFifo *af)" -->
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<td class="memname">void <a class="el" href="group__lavu__audiofifo.html#ga3f070386d11d425302437a3b60fc5dd0">av_audio_fifo_reset</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td>
<td class="paramname"><em>af</em></td><td>)</td>
<td></td>
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<p>Reset the AVAudioFifo buffer. </p>
<p>This empties all data in the buffer.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">af</td><td>AVAudioFifo to reset </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="gaa0a4742ecac52a999e8b4478d27f3b9b"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_size" ref="gaa0a4742ecac52a999e8b4478d27f3b9b" args="(AVAudioFifo *af)" -->
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<td class="memname">int <a class="el" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b">av_audio_fifo_size</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td>
<td class="paramname"><em>af</em></td><td>)</td>
<td></td>
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<p>Get the current number of samples in the AVAudioFifo available for reading. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">af</td><td>the AVAudioFifo to query </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>number of samples available for reading </dd></dl>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="transcode_aac_8c-example.html#a70">transcode_aac.c</a>.</dd>
</dl>
<p>Referenced by <a class="el" href="transcode__aac_8c_source.html#l00413">add_samples_to_fifo()</a>, <a class="el" href="transcode__aac_8c_source.html#l00597">load_encode_and_write()</a>, and <a class="el" href="transcode__aac_8c_source.html#l00649">main()</a>.</p>
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<a class="anchor" id="ga2bed2f01fe34228ee8a73617b3177d00"></a><!-- doxytag: member="audio_fifo.h::av_audio_fifo_space" ref="ga2bed2f01fe34228ee8a73617b3177d00" args="(AVAudioFifo *af)" -->
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<td class="memname">int <a class="el" href="group__lavu__audiofifo.html#ga2bed2f01fe34228ee8a73617b3177d00">av_audio_fifo_space</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> * </td>
<td class="paramname"><em>af</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Get the current number of samples in the AVAudioFifo available for writing. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">af</td><td>the AVAudioFifo to query </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>number of samples available for writing </dd></dl>
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