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 <span id="projectnumber">2.7.1</span>
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<div class="title">Utility functions</div> </div>
<div class="ingroups"><a class="el" href="group__libavc.html">Encoding/Decoding Library</a></div></div><!--header-->
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<p>Miscellaneous utility functions related to both encoding and decoding (or neither).
<a href="#details">More...</a></p>
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Data Structures</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVBitStreamFilterContext.html">AVBitStreamFilterContext</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVBitStreamFilter.html">AVBitStreamFilter</a></td></tr>
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Modules</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc__pixfmt.html">Pixel formats</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight"><p>Functions for working with pixel formats. </p>
<br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html">FFT functions</a></td></tr>
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Enumerations</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga7a013315e444069ec9630ddf3edce3f8">AVLockOp</a> { <a class="el" href="group__lavc__misc.html#gga7a013315e444069ec9630ddf3edce3f8a486a4a2d7a97554c2e073536c038465d">AV_LOCK_CREATE</a>,
<a class="el" href="group__lavc__misc.html#gga7a013315e444069ec9630ddf3edce3f8af684bbd8575f2686f42346f5e43be673">AV_LOCK_OBTAIN</a>,
<a class="el" href="group__lavc__misc.html#gga7a013315e444069ec9630ddf3edce3f8a7c470cd815cdef3b16a977e9a8c89c69">AV_LOCK_RELEASE</a>,
<a class="el" href="group__lavc__misc.html#gga7a013315e444069ec9630ddf3edce3f8aee9ae55e2efe16565998e473c2a18935">AV_LOCK_DESTROY</a>
}</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Lock operation used by lockmgr. <a href="group__lavc__misc.html#ga7a013315e444069ec9630ddf3edce3f8">More...</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"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga4e17541c4f237465b50668d279192da8">avcodec_set_dimensions</a> (<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *s, int <a class="el" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a>, int <a class="el" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a>)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga1f9e278e427564ee2e8b0ad875dbe5df">av_get_codec_tag_string</a> (char *buf, size_t buf_size, unsigned int codec_tag)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Put a string representing the codec tag codec_tag in buf. <a href="#ga1f9e278e427564ee2e8b0ad875dbe5df"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga6d4056568b5ab73d2e55800d9a5caa66">avcodec_string</a> (char *buf, int buf_size, <a class="el" href="structAVCodecContext.html">AVCodecContext</a> *enc, int encode)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga0dc4a8003d0818a235bde2d8fbe81e11">av_get_profile_name</a> (const <a class="el" href="structAVCodec.html">AVCodec</a> *codec, int profile)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a name for the specified profile, if available. <a href="#ga0dc4a8003d0818a235bde2d8fbe81e11"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga9ccd730ba6e891b6c61da68ab138c63f">avcodec_default_execute</a> (<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *c, int(*func)(<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *c2, void *arg2), void *arg, int *ret, int count, int size)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga365b89d7f5b6dc9f930f07ec4078a611">avcodec_default_execute2</a> (<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *c, int(*func)(<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *c2, void *arg2, int, int), void *arg, int *ret, int count)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga66b44aad56fa22a78fb8916eb8cc0516">avcodec_fill_audio_frame</a> (<a class="el" href="structAVFrame.html">AVFrame</a> *<a class="el" href="extract__mvs_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>, int nb_channels, enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> sample_fmt, const uint8_t *buf, int buf_size, int align)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Fill <a class="el" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> audio data and linesize pointers. <a href="#ga66b44aad56fa22a78fb8916eb8cc0516"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#gaf60b0e076f822abcb2700eb601d352a6">avcodec_flush_buffers</a> (<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *avctx)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Reset the internal decoder state / flush internal buffers. <a href="#gaf60b0e076f822abcb2700eb601d352a6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga0717e7440fdb123f708082f66cd9b41d">av_get_bits_per_sample</a> (enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> codec_id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return codec bits per sample. <a href="#ga0717e7440fdb123f708082f66cd9b41d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#gafa5775a0bd6a6ab58011e8492156eb6e">av_get_pcm_codec</a> (enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> fmt, int be)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the PCM codec associated with a sample format. <a href="#gafa5775a0bd6a6ab58011e8492156eb6e"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#gadddbcd146ffaf53016bac730c631f7b3">av_get_exact_bits_per_sample</a> (enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> codec_id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return codec bits per sample. <a href="#gadddbcd146ffaf53016bac730c631f7b3"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga3266a8c3df0790c62259f91afcde45a9">av_get_audio_frame_duration</a> (<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *avctx, int frame_bytes)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return audio frame duration. <a href="#ga3266a8c3df0790c62259f91afcde45a9"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga520e0d7584b92d70e51ff0fcc3551764">av_register_bitstream_filter</a> (<a class="el" href="structAVBitStreamFilter.html">AVBitStreamFilter</a> *bsf)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Register a bitstream filter. <a href="#ga520e0d7584b92d70e51ff0fcc3551764"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="structAVBitStreamFilterContext.html">AVBitStreamFilterContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga4f87a57cd7c08c1d9b9bfe1a4bd611f3">av_bitstream_filter_init</a> (const char *name)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create and initialize a bitstream filter context given a bitstream filter name. <a href="#ga4f87a57cd7c08c1d9b9bfe1a4bd611f3"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga1ab3bf4e396f0bbc5151df6af765543d">av_bitstream_filter_filter</a> (<a class="el" href="structAVBitStreamFilterContext.html">AVBitStreamFilterContext</a> *bsfc, <a class="el" href="structAVCodecContext.html">AVCodecContext</a> *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Filter bitstream. <a href="#ga1ab3bf4e396f0bbc5151df6af765543d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#gabee15852c201976249e89964161a44b4">av_bitstream_filter_close</a> (<a class="el" href="structAVBitStreamFilterContext.html">AVBitStreamFilterContext</a> *bsf)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Release bitstream filter context. <a href="#gabee15852c201976249e89964161a44b4"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="structAVBitStreamFilter.html">AVBitStreamFilter</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga940bf6b3f2ea61c0265e48e66545f976">av_bitstream_filter_next</a> (const <a class="el" href="structAVBitStreamFilter.html">AVBitStreamFilter</a> *f)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">If f is NULL, return the first registered bitstream filter, if f is non-NULL, return the next registered bitstream filter after f, or NULL if f is the last one. <a href="#ga940bf6b3f2ea61c0265e48e66545f976"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga04a23a2336412504052d5c4e0c7716ee">av_fast_padded_malloc</a> (void *ptr, unsigned int *size, size_t min_size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Same behaviour av_fast_malloc but the buffer has additional FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0. <a href="#ga04a23a2336412504052d5c4e0c7716ee"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#gaea5550dc9271f356631f7002772158d8">av_fast_padded_mallocz</a> (void *ptr, unsigned int *size, size_t min_size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call. <a href="#gaea5550dc9271f356631f7002772158d8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga144411ccbce77847ee9ce10d7fe5361c">av_xiphlacing</a> (unsigned char *s, unsigned int v)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Encode extradata length to a buffer. <a href="#ga144411ccbce77847ee9ce10d7fe5361c"></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__misc.html#ga8df73458e977b4a0f9d8e4f1eeae47f1">av_log_missing_feature</a> (void *avc, const char *feature, int want_sample)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Log a generic warning message about a missing feature. <a href="#ga8df73458e977b4a0f9d8e4f1eeae47f1"></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__misc.html#ga90d24e73ca8633fc9e42c4bf2faf7923">av_log_ask_for_sample</a> (void *avc, const char *msg,...) <a class="el" href="attributes_8h.html#a4b078d4b8e02c0f452ee1dcaa7d983d3">av_printf_format</a>(2</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Log a generic warning message asking for a sample. <a href="#ga90d24e73ca8633fc9e42c4bf2faf7923"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga1e7e3fd30164d0af5139885404fd2407">av_register_hwaccel</a> (<a class="el" href="structAVHWAccel.html">AVHWAccel</a> *hwaccel)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Register the hardware accelerator hwaccel. <a href="#ga1e7e3fd30164d0af5139885404fd2407"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="structAVHWAccel.html">AVHWAccel</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#gacd85ab0da8585474814590a81d011d5c">av_hwaccel_next</a> (const <a class="el" href="structAVHWAccel.html">AVHWAccel</a> *hwaccel)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL, returns the next registered hardware accelerator after hwaccel, or NULL if hwaccel is the last one. <a href="#gacd85ab0da8585474814590a81d011d5c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#gae120ec60cdf49cf0f793eff3ec731bcc">av_lockmgr_register</a> (int(*cb)(void **mutex, enum <a class="el" href="group__lavc__misc.html#ga7a013315e444069ec9630ddf3edce3f8">AVLockOp</a> op))</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Register a user provided lock manager supporting the operations specified by AVLockOp. <a href="#gae120ec60cdf49cf0f793eff3ec731bcc"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum <a class="el" href="group__lavu__misc.html#ga9a84bba4713dfced21a1a56163be1f48">AVMediaType</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga9680ab906f1206deafc521ed54927375">avcodec_get_type</a> (enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> codec_id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the type of the given codec. <a href="#ga9680ab906f1206deafc521ed54927375"></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__lavc__misc.html#ga2016a52e94f867ebe5113bdf448e182d">avcodec_get_name</a> (enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> id)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the name of a codec. <a href="#ga2016a52e94f867ebe5113bdf448e182d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga906dda732e79eac12067c6d7ea19b630">avcodec_is_open</a> (<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *s)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga2b665824e4d9144f8d4f6c01e3e85aa3">av_codec_is_encoder</a> (const <a class="el" href="structAVCodec.html">AVCodec</a> *codec)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga6dc18eef1afca3610644a52565cf8a31">av_codec_is_decoder</a> (const <a class="el" href="structAVCodec.html">AVCodec</a> *codec)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structAVCodecDescriptor.html">AVCodecDescriptor</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#gac09f8ddc2d4b36c5a85c6befba0d0888">avcodec_descriptor_get</a> (enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> id)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structAVCodecDescriptor.html">AVCodecDescriptor</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga909ef5261eafb1be1871f718353632bd">avcodec_descriptor_next</a> (const <a class="el" href="structAVCodecDescriptor.html">AVCodecDescriptor</a> *prev)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Iterate over all codec descriptors known to libavcodec. <a href="#ga909ef5261eafb1be1871f718353632bd"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structAVCodecDescriptor.html">AVCodecDescriptor</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc.html#ga199f854b030f24bd31d251f9d36f1392">avcodec_descriptor_get_by_name</a> (const char *name)</td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<p>Miscellaneous utility functions related to both encoding and decoding (or neither). </p>
<hr/><h2>Enumeration Type Documentation</h2>
<a class="anchor" id="ga7a013315e444069ec9630ddf3edce3f8"></a><!-- doxytag: member="avcodec.h::AVLockOp" ref="ga7a013315e444069ec9630ddf3edce3f8" args="" -->
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<td class="memname">enum <a class="el" href="group__lavc__misc.html#ga7a013315e444069ec9630ddf3edce3f8">AVLockOp</a></td>
</tr>
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<p>Lock operation used by lockmgr. </p>
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="gga7a013315e444069ec9630ddf3edce3f8a486a4a2d7a97554c2e073536c038465d"></a><!-- doxytag: member="AV_LOCK_CREATE" ref="gga7a013315e444069ec9630ddf3edce3f8a486a4a2d7a97554c2e073536c038465d" args="" -->AV_LOCK_CREATE</em> </td><td>
<p>Create a mutex. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga7a013315e444069ec9630ddf3edce3f8af684bbd8575f2686f42346f5e43be673"></a><!-- doxytag: member="AV_LOCK_OBTAIN" ref="gga7a013315e444069ec9630ddf3edce3f8af684bbd8575f2686f42346f5e43be673" args="" -->AV_LOCK_OBTAIN</em> </td><td>
<p>Lock the mutex. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga7a013315e444069ec9630ddf3edce3f8a7c470cd815cdef3b16a977e9a8c89c69"></a><!-- doxytag: member="AV_LOCK_RELEASE" ref="gga7a013315e444069ec9630ddf3edce3f8a7c470cd815cdef3b16a977e9a8c89c69" args="" -->AV_LOCK_RELEASE</em> </td><td>
<p>Unlock the mutex. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga7a013315e444069ec9630ddf3edce3f8aee9ae55e2efe16565998e473c2a18935"></a><!-- doxytag: member="AV_LOCK_DESTROY" ref="gga7a013315e444069ec9630ddf3edce3f8aee9ae55e2efe16565998e473c2a18935" args="" -->AV_LOCK_DESTROY</em> </td><td>
<p>Free mutex resources. </p>
</td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="libavcodec_2avcodec_8h_source.html#l05237">5237</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="ga4e17541c4f237465b50668d279192da8"></a><!-- doxytag: member="avcodec.h::avcodec_set_dimensions" ref="ga4e17541c4f237465b50668d279192da8" args="(AVCodecContext *s, int width, int height)" -->
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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__misc.html#ga4e17541c4f237465b50668d279192da8">avcodec_set_dimensions</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>width</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>height</em> </td>
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<td></td>
<td>)</td>
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<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000024">Deprecated:</a></b></dt><dd>this function is not supposed to be used from outside of lavc </dd></dl>
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</div>
<a class="anchor" id="ga1f9e278e427564ee2e8b0ad875dbe5df"></a><!-- doxytag: member="avcodec.h::av_get_codec_tag_string" ref="ga1f9e278e427564ee2e8b0ad875dbe5df" args="(char *buf, size_t buf_size, unsigned int codec_tag)" -->
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<td class="memname">size_t <a class="el" href="group__lavc__misc.html#ga1f9e278e427564ee2e8b0ad875dbe5df">av_get_codec_tag_string</a> </td>
<td>(</td>
<td class="paramtype">char * </td>
<td class="paramname"><em>buf</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>buf_size</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">unsigned int </td>
<td class="paramname"><em>codec_tag</em> </td>
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<p>Put a string representing the codec tag codec_tag in buf. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">buf</td><td>buffer to place codec tag in </td></tr>
<tr><td class="paramname">buf_size</td><td>size in bytes of buf </td></tr>
<tr><td class="paramname">codec_tag</td><td>codec tag to assign </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the length of the string that would have been generated if enough space had been available, excluding the trailing null </dd></dl>
</div>
</div>
<a class="anchor" id="ga6d4056568b5ab73d2e55800d9a5caa66"></a><!-- doxytag: member="avcodec.h::avcodec_string" ref="ga6d4056568b5ab73d2e55800d9a5caa66" args="(char *buf, int buf_size, AVCodecContext *enc, int encode)" -->
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<td class="memname">void <a class="el" href="group__lavc__misc.html#ga6d4056568b5ab73d2e55800d9a5caa66">avcodec_string</a> </td>
<td>(</td>
<td class="paramtype">char * </td>
<td class="paramname"><em>buf</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>buf_size</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>enc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>encode</em> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<a class="anchor" id="ga0dc4a8003d0818a235bde2d8fbe81e11"></a><!-- doxytag: member="avcodec.h::av_get_profile_name" ref="ga0dc4a8003d0818a235bde2d8fbe81e11" args="(const AVCodec *codec, int profile)" -->
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<td class="memname">const char* <a class="el" href="group__lavc__misc.html#ga0dc4a8003d0818a235bde2d8fbe81e11">av_get_profile_name</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVCodec.html">AVCodec</a> * </td>
<td class="paramname"><em>codec</em>, </td>
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<td class="paramname"><em>profile</em> </td>
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<p>Return a name for the specified profile, if available. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">codec</td><td>the codec that is searched for the given profile </td></tr>
<tr><td class="paramname">profile</td><td>the profile value for which a name is requested </td></tr>
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</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>A name for the profile if found, NULL otherwise. </dd></dl>
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<a class="anchor" id="ga9ccd730ba6e891b6c61da68ab138c63f"></a><!-- doxytag: member="avcodec.h::avcodec_default_execute" ref="ga9ccd730ba6e891b6c61da68ab138c63f" args="(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)" -->
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<td class="memname">int <a class="el" href="group__lavc__misc.html#ga9ccd730ba6e891b6c61da68ab138c63f">avcodec_default_execute</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>c</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int(*)(<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *c2, void *arg2) </td>
<td class="paramname"><em>func</em>, </td>
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<td class="paramtype">void * </td>
<td class="paramname"><em>arg</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>ret</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>count</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>size</em> </td>
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<a class="anchor" id="ga365b89d7f5b6dc9f930f07ec4078a611"></a><!-- doxytag: member="avcodec.h::avcodec_default_execute2" ref="ga365b89d7f5b6dc9f930f07ec4078a611" args="(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)" -->
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<td>(</td>
<td class="paramtype"><a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>c</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int(*)(<a class="el" href="structAVCodecContext.html">AVCodecContext</a> *c2, void *arg2, int, int) </td>
<td class="paramname"><em>func</em>, </td>
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<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>arg</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>ret</em>, </td>
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<td class="paramname"><em>count</em> </td>
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<a class="anchor" id="ga66b44aad56fa22a78fb8916eb8cc0516"></a><!-- doxytag: member="avcodec.h::avcodec_fill_audio_frame" ref="ga66b44aad56fa22a78fb8916eb8cc0516" args="(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align)" -->
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<td>(</td>
<td class="paramtype"><a class="el" href="structAVFrame.html">AVFrame</a> * </td>
<td class="paramname"><em>frame</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>nb_channels</em>, </td>
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<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</em>, </td>
</tr>
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<td class="paramkey"></td>
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<td class="paramtype">const uint8_t * </td>
<td class="paramname"><em>buf</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>buf_size</em>, </td>
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<td class="paramname"><em>align</em> </td>
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<p>Fill <a class="el" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> audio data and linesize pointers. </p>
<p>The buffer buf must be a preallocated buffer with a size big enough to contain the specified samples amount. The filled <a class="el" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> data pointers will point to this buffer.</p>
<p><a class="el" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> extended_data channel pointers are allocated if necessary for planar audio.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">frame</td><td>the <a class="el" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> frame->nb_samples must be set prior to calling the function. This function fills in frame->data, frame->extended_data, frame->linesize[0]. </td></tr>
<tr><td class="paramname">nb_channels</td><td>channel count </td></tr>
<tr><td class="paramname">sample_fmt</td><td>sample format </td></tr>
<tr><td class="paramname">buf</td><td>buffer to use for frame data </td></tr>
<tr><td class="paramname">buf_size</td><td>size of buffer </td></tr>
<tr><td class="paramname">align</td><td>plane size sample alignment (0 = default) </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>>=0 on success, negative error code on failure </dd></dl>
<dl class="todo"><dt><b><a class="el" href="todo.html#_todo000002">Todo:</a></b></dt><dd>return the size in bytes required to store the samples in case of success, at the next libavutil bump </dd></dl>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="decoding_encoding_8c-example.html#a34">decoding_encoding.c</a>.</dd>
</dl>
<p>Referenced by <a class="el" href="decoding__encoding_8c_source.html#l00103">audio_encode_example()</a>.</p>
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<a class="anchor" id="gaf60b0e076f822abcb2700eb601d352a6"></a><!-- doxytag: member="avcodec.h::avcodec_flush_buffers" ref="gaf60b0e076f822abcb2700eb601d352a6" args="(AVCodecContext *avctx)" -->
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<td>(</td>
<td class="paramtype"><a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>avctx</em></td><td>)</td>
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<p>Reset the internal decoder state / flush internal buffers. </p>
<p>Should be called e.g. when seeking or when switching to a different stream.</p>
<dl class="note"><dt><b>Note:</b></dt><dd>when refcounted frames are not used (i.e. avctx->refcounted_frames is 0), this invalidates the frames previously returned from the decoder. When refcounted frames are used, the decoder just releases any references it might keep internally, but the caller's reference remains valid. </dd></dl>
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<a class="anchor" id="ga0717e7440fdb123f708082f66cd9b41d"></a><!-- doxytag: member="avcodec.h::av_get_bits_per_sample" ref="ga0717e7440fdb123f708082f66cd9b41d" args="(enum AVCodecID codec_id)" -->
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<td>(</td>
<td class="paramtype">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> </td>
<td class="paramname"><em>codec_id</em></td><td>)</td>
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<p>Return codec bits per sample. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">codec_id</td><td>the codec </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Number of bits per sample or zero if unknown for the given codec. </dd></dl>
</div>
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<a class="anchor" id="gafa5775a0bd6a6ab58011e8492156eb6e"></a><!-- doxytag: member="avcodec.h::av_get_pcm_codec" ref="gafa5775a0bd6a6ab58011e8492156eb6e" args="(enum AVSampleFormat fmt, int be)" -->
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<td class="memname">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> <a class="el" href="group__lavc__misc.html#gafa5775a0bd6a6ab58011e8492156eb6e">av_get_pcm_codec</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> </td>
<td class="paramname"><em>fmt</em>, </td>
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<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>be</em> </td>
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<p>Return the PCM codec associated with a sample format. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">be</td><td>endianness, 0 for little, 1 for big, -1 (or anything else) for native </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE </dd></dl>
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<a class="anchor" id="gadddbcd146ffaf53016bac730c631f7b3"></a><!-- doxytag: member="avcodec.h::av_get_exact_bits_per_sample" ref="gadddbcd146ffaf53016bac730c631f7b3" args="(enum AVCodecID codec_id)" -->
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<td class="memname">int <a class="el" href="group__lavc__misc.html#gadddbcd146ffaf53016bac730c631f7b3">av_get_exact_bits_per_sample</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> </td>
<td class="paramname"><em>codec_id</em></td><td>)</td>
<td></td>
</tr>
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<div class="memdoc">
<p>Return codec bits per sample. </p>
<p>Only return non-zero if the bits per sample is exactly correct, not an approximation.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">codec_id</td><td>the codec </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>Number of bits per sample or zero if unknown for the given codec. </dd></dl>
</div>
</div>
<a class="anchor" id="ga3266a8c3df0790c62259f91afcde45a9"></a><!-- doxytag: member="avcodec.h::av_get_audio_frame_duration" ref="ga3266a8c3df0790c62259f91afcde45a9" args="(AVCodecContext *avctx, int frame_bytes)" -->
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<td class="memname">int <a class="el" href="group__lavc__misc.html#ga3266a8c3df0790c62259f91afcde45a9">av_get_audio_frame_duration</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>avctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>frame_bytes</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Return audio frame duration. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">avctx</td><td>codec context </td></tr>
<tr><td class="paramname">frame_bytes</td><td>size of the frame, or 0 if unknown </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>frame duration, in samples, if known. 0 if not able to determine. </dd></dl>
</div>
</div>
<a class="anchor" id="ga520e0d7584b92d70e51ff0fcc3551764"></a><!-- doxytag: member="avcodec.h::av_register_bitstream_filter" ref="ga520e0d7584b92d70e51ff0fcc3551764" args="(AVBitStreamFilter *bsf)" -->
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<td class="memname">void <a class="el" href="group__lavc__misc.html#ga520e0d7584b92d70e51ff0fcc3551764">av_register_bitstream_filter</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVBitStreamFilter.html">AVBitStreamFilter</a> * </td>
<td class="paramname"><em>bsf</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Register a bitstream filter. </p>
<p>The filter will be accessible to the application code through <a class="el" href="group__lavc__misc.html#ga940bf6b3f2ea61c0265e48e66545f976" title="If f is NULL, return the first registered bitstream filter, if f is non-NULL, return the next registe...">av_bitstream_filter_next()</a> or can be directly initialized with <a class="el" href="group__lavc__misc.html#ga4f87a57cd7c08c1d9b9bfe1a4bd611f3" title="Create and initialize a bitstream filter context given a bitstream filter name.">av_bitstream_filter_init()</a>.</p>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="group__lavc__core.html#gaf1a2bb4e7c7611c131bb6212bf0fa639" title="Register all the codecs, parsers and bitstream filters which were enabled at configuration time...">avcodec_register_all()</a> </dd></dl>
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<a class="anchor" id="ga4f87a57cd7c08c1d9b9bfe1a4bd611f3"></a><!-- doxytag: member="avcodec.h::av_bitstream_filter_init" ref="ga4f87a57cd7c08c1d9b9bfe1a4bd611f3" args="(const char *name)" -->
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<td class="memname"><a class="el" href="structAVBitStreamFilterContext.html">AVBitStreamFilterContext</a>* <a class="el" href="group__lavc__misc.html#ga4f87a57cd7c08c1d9b9bfe1a4bd611f3">av_bitstream_filter_init</a> </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>name</em></td><td>)</td>
<td></td>
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<p>Create and initialize a bitstream filter context given a bitstream filter name. </p>
<p>The returned context must be freed with <a class="el" href="group__lavc__misc.html#gabee15852c201976249e89964161a44b4" title="Release bitstream filter context.">av_bitstream_filter_close()</a>.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">name</td><td>the name of the bitstream filter </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>a bitstream filter context if a matching filter was found and successfully initialized, NULL otherwise </dd></dl>
</div>
</div>
<a class="anchor" id="ga1ab3bf4e396f0bbc5151df6af765543d"></a><!-- doxytag: member="avcodec.h::av_bitstream_filter_filter" ref="ga1ab3bf4e396f0bbc5151df6af765543d" args="(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)" -->
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<td class="memname">int <a class="el" href="group__lavc__misc.html#ga1ab3bf4e396f0bbc5151df6af765543d">av_bitstream_filter_filter</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVBitStreamFilterContext.html">AVBitStreamFilterContext</a> * </td>
<td class="paramname"><em>bsfc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>avctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>args</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint8_t ** </td>
<td class="paramname"><em>poutbuf</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"><em>poutbuf_size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const uint8_t * </td>
<td class="paramname"><em>buf</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>buf_size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>keyframe</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Filter bitstream. </p>
<p>This function filters the buffer buf with size buf_size, and places the filtered buffer in the buffer pointed to by poutbuf.</p>
<p>The output buffer must be freed by the caller.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">bsfc</td><td>bitstream filter context created by <a class="el" href="group__lavc__misc.html#ga4f87a57cd7c08c1d9b9bfe1a4bd611f3" title="Create and initialize a bitstream filter context given a bitstream filter name.">av_bitstream_filter_init()</a> </td></tr>
<tr><td class="paramname">avctx</td><td><a class="el" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> accessed by the filter, may be NULL. If specified, this must point to the encoder context of the output stream the packet is sent to. </td></tr>
<tr><td class="paramname">args</td><td>arguments which specify the filter configuration, may be NULL </td></tr>
<tr><td class="paramname">poutbuf</td><td>pointer which is updated to point to the filtered buffer </td></tr>
<tr><td class="paramname">poutbuf_size</td><td>pointer which is updated to the filtered buffer size in bytes </td></tr>
<tr><td class="paramname">buf</td><td>buffer containing the data to filter </td></tr>
<tr><td class="paramname">buf_size</td><td>size in bytes of buf </td></tr>
<tr><td class="paramname">keyframe</td><td>set to non-zero if the buffer to filter corresponds to a key-frame packet data </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>>= 0 in case of success, or a negative error code in case of failure</dd></dl>
<p>If the return value is positive, an output buffer is allocated and is available in *poutbuf, and is distinct from the input buffer.</p>
<p>If the return value is 0, the output buffer is not allocated and should be considered identical to the input buffer, or in case *poutbuf was set it points to the input buffer (not necessarily to its starting address). </p>
</div>
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<a class="anchor" id="gabee15852c201976249e89964161a44b4"></a><!-- doxytag: member="avcodec.h::av_bitstream_filter_close" ref="gabee15852c201976249e89964161a44b4" args="(AVBitStreamFilterContext *bsf)" -->
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<td class="memname">void <a class="el" href="group__lavc__misc.html#gabee15852c201976249e89964161a44b4">av_bitstream_filter_close</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVBitStreamFilterContext.html">AVBitStreamFilterContext</a> * </td>
<td class="paramname"><em>bsf</em></td><td>)</td>
<td></td>
</tr>
</table>
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<div class="memdoc">
<p>Release bitstream filter context. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">bsf</td><td>the bitstream filter context created with <a class="el" href="group__lavc__misc.html#ga4f87a57cd7c08c1d9b9bfe1a4bd611f3" title="Create and initialize a bitstream filter context given a bitstream filter name.">av_bitstream_filter_init()</a>, can be NULL </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga940bf6b3f2ea61c0265e48e66545f976"></a><!-- doxytag: member="avcodec.h::av_bitstream_filter_next" ref="ga940bf6b3f2ea61c0265e48e66545f976" args="(const AVBitStreamFilter *f)" -->
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<td class="memname"><a class="el" href="structAVBitStreamFilter.html">AVBitStreamFilter</a>* <a class="el" href="group__lavc__misc.html#ga940bf6b3f2ea61c0265e48e66545f976">av_bitstream_filter_next</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVBitStreamFilter.html">AVBitStreamFilter</a> * </td>
<td class="paramname"><em>f</em></td><td>)</td>
<td></td>
</tr>
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<p>If f is NULL, return the first registered bitstream filter, if f is non-NULL, return the next registered bitstream filter after f, or NULL if f is the last one. </p>
<p>This function can be used to iterate over all registered bitstream filters. </p>
</div>
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<a class="anchor" id="ga04a23a2336412504052d5c4e0c7716ee"></a><!-- doxytag: member="avcodec.h::av_fast_padded_malloc" ref="ga04a23a2336412504052d5c4e0c7716ee" args="(void *ptr, unsigned int *size, size_t min_size)" -->
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<td class="memname">void <a class="el" href="group__lavc__misc.html#ga04a23a2336412504052d5c4e0c7716ee">av_fast_padded_malloc</a> </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>ptr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int * </td>
<td class="paramname"><em>size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>min_size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
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<p>Same behaviour av_fast_malloc but the buffer has additional FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0. </p>
<p>In addition the whole buffer will initially and after resizes be 0-initialized so that no uninitialized data will ever appear. </p>
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<a class="anchor" id="gaea5550dc9271f356631f7002772158d8"></a><!-- doxytag: member="avcodec.h::av_fast_padded_mallocz" ref="gaea5550dc9271f356631f7002772158d8" args="(void *ptr, unsigned int *size, size_t min_size)" -->
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<td class="memname">void <a class="el" href="group__lavc__misc.html#gaea5550dc9271f356631f7002772158d8">av_fast_padded_mallocz</a> </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>ptr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int * </td>
<td class="paramname"><em>size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>min_size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
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<div class="memdoc">
<p>Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call. </p>
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<a class="anchor" id="ga144411ccbce77847ee9ce10d7fe5361c"></a><!-- doxytag: member="avcodec.h::av_xiphlacing" ref="ga144411ccbce77847ee9ce10d7fe5361c" args="(unsigned char *s, unsigned int v)" -->
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<td class="memname">unsigned int <a class="el" href="group__lavc__misc.html#ga144411ccbce77847ee9ce10d7fe5361c">av_xiphlacing</a> </td>
<td>(</td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>v</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Encode extradata length to a buffer. </p>
<p>Used by xiph codecs.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">s</td><td>buffer to write to; must be at least (v/255+1) bytes long </td></tr>
<tr><td class="paramname">v</td><td>size of extradata in bytes </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>number of bytes written to the buffer. </dd></dl>
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<a class="anchor" id="ga8df73458e977b4a0f9d8e4f1eeae47f1"></a><!-- doxytag: member="avcodec.h::av_log_missing_feature" ref="ga8df73458e977b4a0f9d8e4f1eeae47f1" args="(void *avc, const char *feature, int want_sample)" -->
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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__misc.html#ga8df73458e977b4a0f9d8e4f1eeae47f1">av_log_missing_feature</a> </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>avc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>feature</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>want_sample</em> </td>
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<tr>
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<td>)</td>
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<p>Log a generic warning message about a missing feature. </p>
<p>This function is intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) only, and would normally not be used by applications. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">avc</td><td>a pointer to an arbitrary struct of which the first field is a pointer to an <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> struct </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">feature</td><td>string containing the name of the missing feature </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">want_sample</td><td>indicates if samples are wanted which exhibit this feature. If want_sample is non-zero, additional verbage will be added to the log message which tells the user how to report samples to the development mailing list. </td></tr>
</table>
</dd>
</dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000025">Deprecated:</a></b></dt><dd>Use avpriv_report_missing_feature() instead. </dd></dl>
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<a class="anchor" id="ga90d24e73ca8633fc9e42c4bf2faf7923"></a><!-- doxytag: member="avcodec.h::av_log_ask_for_sample" ref="ga90d24e73ca8633fc9e42c4bf2faf7923" args="(void *avc, const char *msg,...) av_printf_format(2" -->
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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__misc.html#ga90d24e73ca8633fc9e42c4bf2faf7923">av_log_ask_for_sample</a> </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>avc</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>msg</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname"><em>...</em> </td>
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<td></td>
<td>)</td>
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<p>Log a generic warning message asking for a sample. </p>
<p>This function is intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) only, and would normally not be used by applications. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">avc</td><td>a pointer to an arbitrary struct of which the first field is a pointer to an <a class="el" href="structAVClass.html" title="Describe the class of an AVClass context structure.">AVClass</a> struct </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">msg</td><td>string containing an optional message, or NULL if no message </td></tr>
</table>
</dd>
</dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000026">Deprecated:</a></b></dt><dd>Use avpriv_request_sample() instead. </dd></dl>
</div>
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<a class="anchor" id="ga1e7e3fd30164d0af5139885404fd2407"></a><!-- doxytag: member="avcodec.h::av_register_hwaccel" ref="ga1e7e3fd30164d0af5139885404fd2407" args="(AVHWAccel *hwaccel)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> void void <a class="el" href="group__lavc__misc.html#ga1e7e3fd30164d0af5139885404fd2407">av_register_hwaccel</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVHWAccel.html">AVHWAccel</a> * </td>
<td class="paramname"><em>hwaccel</em></td><td>)</td>
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<p>Register the hardware accelerator hwaccel. </p>
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<a class="anchor" id="gacd85ab0da8585474814590a81d011d5c"></a><!-- doxytag: member="avcodec.h::av_hwaccel_next" ref="gacd85ab0da8585474814590a81d011d5c" args="(const AVHWAccel *hwaccel)" -->
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<td class="memname"><a class="el" href="structAVHWAccel.html">AVHWAccel</a>* <a class="el" href="group__lavc__misc.html#gacd85ab0da8585474814590a81d011d5c">av_hwaccel_next</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVHWAccel.html">AVHWAccel</a> * </td>
<td class="paramname"><em>hwaccel</em></td><td>)</td>
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<p>If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL, returns the next registered hardware accelerator after hwaccel, or NULL if hwaccel is the last one. </p>
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<a class="anchor" id="gae120ec60cdf49cf0f793eff3ec731bcc"></a><!-- doxytag: member="avcodec.h::av_lockmgr_register" ref="gae120ec60cdf49cf0f793eff3ec731bcc" args="(int(*cb)(void **mutex, enum AVLockOp op))" -->
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<td class="memname">int <a class="el" href="group__lavc__misc.html#gae120ec60cdf49cf0f793eff3ec731bcc">av_lockmgr_register</a> </td>
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<td class="paramtype">int(*)(void **mutex, enum <a class="el" href="group__lavc__misc.html#ga7a013315e444069ec9630ddf3edce3f8">AVLockOp</a> op) </td>
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<p>Register a user provided lock manager supporting the operations specified by AVLockOp. </p>
<p>The "mutex" argument to the function points to a (void *) where the lockmgr should store/get a pointer to a user allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the value left by the last call for all other ops. If the lock manager is unable to perform the op then it should leave the mutex in the same state as when it was called and return a non-zero value. However, when called with AV_LOCK_DESTROY the mutex will always be assumed to have been successfully destroyed. If av_lockmgr_register succeeds it will return a non-negative value, if it fails it will return a negative value and destroy all mutex and unregister all callbacks. av_lockmgr_register is not thread-safe, it must be called from a single thread before any calls which make use of locking are used.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">cb</td><td>User defined callback. av_lockmgr_register invokes calls to this callback and the previously registered callback. The callback will be used to create more than one mutex each of which must be backed by its own underlying locking mechanism (i.e. do not use a single static object to implement your lock manager). If cb is set to NULL the lockmgr will be unregistered. </td></tr>
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<a class="anchor" id="ga9680ab906f1206deafc521ed54927375"></a><!-- doxytag: member="avcodec.h::avcodec_get_type" ref="ga9680ab906f1206deafc521ed54927375" args="(enum AVCodecID codec_id)" -->
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<td class="memname">enum <a class="el" href="group__lavu__misc.html#ga9a84bba4713dfced21a1a56163be1f48">AVMediaType</a> <a class="el" href="group__lavc__misc.html#ga9680ab906f1206deafc521ed54927375">avcodec_get_type</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> </td>
<td class="paramname"><em>codec_id</em></td><td>)</td>
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<p>Get the type of the given codec. </p>
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<a class="anchor" id="ga2016a52e94f867ebe5113bdf448e182d"></a><!-- doxytag: member="avcodec.h::avcodec_get_name" ref="ga2016a52e94f867ebe5113bdf448e182d" args="(enum AVCodecID id)" -->
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<td class="memname">const char* <a class="el" href="group__lavc__misc.html#ga2016a52e94f867ebe5113bdf448e182d">avcodec_get_name</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> </td>
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<p>Get the name of a codec. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>a static string identifying the codec; never NULL </dd></dl>
<dl><dt><b>Examples: </b></dt><dd><a class="el" href="muxing_8c-example.html#a35">muxing.c</a>.</dd>
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<p>Referenced by <a class="el" href="muxing_8c_source.html#l00092">add_stream()</a>.</p>
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<a class="anchor" id="ga906dda732e79eac12067c6d7ea19b630"></a><!-- doxytag: member="avcodec.h::avcodec_is_open" ref="ga906dda732e79eac12067c6d7ea19b630" args="(AVCodecContext *s)" -->
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<td class="memname">int <a class="el" href="group__lavc__misc.html#ga906dda732e79eac12067c6d7ea19b630">avcodec_is_open</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>s</em></td><td>)</td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>a positive value if s is open (i.e. <a class="el" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d" title="Initialize the AVCodecContext to use the given AVCodec.">avcodec_open2()</a> was called on it with no corresponding <a class="el" href="group__lavc__core.html#gaf4daa92361efb3523ef5afeb0b54077f" title="Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...">avcodec_close()</a>), 0 otherwise. </dd></dl>
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<a class="anchor" id="ga2b665824e4d9144f8d4f6c01e3e85aa3"></a><!-- doxytag: member="avcodec.h::av_codec_is_encoder" ref="ga2b665824e4d9144f8d4f6c01e3e85aa3" args="(const AVCodec *codec)" -->
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<td class="memname">int <a class="el" href="group__lavc__misc.html#ga2b665824e4d9144f8d4f6c01e3e85aa3">av_codec_is_encoder</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVCodec.html">AVCodec</a> * </td>
<td class="paramname"><em>codec</em></td><td>)</td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>a non-zero number if codec is an encoder, zero otherwise </dd></dl>
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<a class="anchor" id="ga6dc18eef1afca3610644a52565cf8a31"></a><!-- doxytag: member="avcodec.h::av_codec_is_decoder" ref="ga6dc18eef1afca3610644a52565cf8a31" args="(const AVCodec *codec)" -->
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<td class="memname">int <a class="el" href="group__lavc__misc.html#ga6dc18eef1afca3610644a52565cf8a31">av_codec_is_decoder</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVCodec.html">AVCodec</a> * </td>
<td class="paramname"><em>codec</em></td><td>)</td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>a non-zero number if codec is a decoder, zero otherwise </dd></dl>
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<a class="anchor" id="gac09f8ddc2d4b36c5a85c6befba0d0888"></a><!-- doxytag: member="avcodec.h::avcodec_descriptor_get" ref="gac09f8ddc2d4b36c5a85c6befba0d0888" args="(enum AVCodecID id)" -->
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<td class="memname">const <a class="el" href="structAVCodecDescriptor.html">AVCodecDescriptor</a>* <a class="el" href="group__lavc__misc.html#gac09f8ddc2d4b36c5a85c6befba0d0888">avcodec_descriptor_get</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> </td>
<td class="paramname"><em>id</em></td><td>)</td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>descriptor for given codec ID or NULL if no descriptor exists. </dd></dl>
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<a class="anchor" id="ga909ef5261eafb1be1871f718353632bd"></a><!-- doxytag: member="avcodec.h::avcodec_descriptor_next" ref="ga909ef5261eafb1be1871f718353632bd" args="(const AVCodecDescriptor *prev)" -->
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<td class="memname">const <a class="el" href="structAVCodecDescriptor.html">AVCodecDescriptor</a>* <a class="el" href="group__lavc__misc.html#ga909ef5261eafb1be1871f718353632bd">avcodec_descriptor_next</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structAVCodecDescriptor.html">AVCodecDescriptor</a> * </td>
<td class="paramname"><em>prev</em></td><td>)</td>
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<p>Iterate over all codec descriptors known to libavcodec. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">prev</td><td>previous descriptor. NULL to get the first descriptor.</td></tr>
</table>
</dd>
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<dl class="return"><dt><b>Returns:</b></dt><dd>next descriptor or NULL after the last descriptor </dd></dl>
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<a class="anchor" id="ga199f854b030f24bd31d251f9d36f1392"></a><!-- doxytag: member="avcodec.h::avcodec_descriptor_get_by_name" ref="ga199f854b030f24bd31d251f9d36f1392" args="(const char *name)" -->
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<td class="memname">const <a class="el" href="structAVCodecDescriptor.html">AVCodecDescriptor</a>* <a class="el" href="group__lavc__misc.html#ga199f854b030f24bd31d251f9d36f1392">avcodec_descriptor_get_by_name</a> </td>
<td>(</td>
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<td class="paramname"><em>name</em></td><td>)</td>
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<dl class="return"><dt><b>Returns:</b></dt><dd>codec descriptor with the given name or NULL if no such descriptor exists. </dd></dl>
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