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showbox-public-14
showbox-public-14 / ffmpeg-doc deb
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<div id="projectname">FFmpeg
 <span id="projectnumber">3.0.2</span>
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<div class="title">transcode_aac.c</div> </div>
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<p>Convert an input audio file to AAC in an MP4 container using FFmpeg.</p>
<dl class="section author"><dt>Author</dt><dd>Andreas Unterweger (<a href="#" onclick="location.href='mai'+'lto:'+'dus'+'ts'+'ign'+'s@'+'gma'+'il'+'.co'+'m'; return false;">dusts<span style="display: none;">.nosp@m.</span>igns<span style="display: none;">.nosp@m.</span>@gmai<span style="display: none;">.nosp@m.</span>l.co<span style="display: none;">.nosp@m.</span>m</a>)</dd></dl>
<div class="fragment"><div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment"> * This file is part of FFmpeg.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span></div>
<div class="line"><span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><span class="comment"> * License as published by the Free Software Foundation; either</span></div>
<div class="line"><span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span></div>
<div class="line"><span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span></div>
<div class="line"><span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * @file</span></div>
<div class="line"><span class="comment"> * simple audio converter</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * @example transcode_aac.c</span></div>
<div class="line"><span class="comment"> * Convert an input audio file to AAC in an MP4 container using FFmpeg.</span></div>
<div class="line"><span class="comment"> * @author Andreas Unterweger (dustsigns@gmail.com)</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="avformat_8h.html">libavformat/avformat.h</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="avio_8h.html">libavformat/avio.h</a>"</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="avcodec_8h.html">libavcodec/avcodec.h</a>"</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="audio__fifo_8h.html">libavutil/audio_fifo.h</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="avassert_8h.html">libavutil/avassert.h</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="avstring_8h.html">libavutil/avstring.h</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="frame_8h.html">libavutil/frame.h</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="opt_8h.html">libavutil/opt.h</a>"</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="swresample_8h.html">libswresample/swresample.h</a>"</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** The output bit rate in kbit/s */</span></div>
<div class="line"><span class="preprocessor">#define OUTPUT_BIT_RATE 96000</span></div>
<div class="line"><span class="preprocessor"></span><span class="comment">/** The number of output channels */</span></div>
<div class="line"><span class="preprocessor">#define OUTPUT_CHANNELS 2</span></div>
<div class="line"><span class="preprocessor"></span><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * Convert an error code into a text message.</span></div>
<div class="line"><span class="comment"> * @param error Error code to be converted</span></div>
<div class="line"><span class="comment"> * @return Corresponding error text (not thread-safe)</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a name="a0"></a><a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(<span class="keyword">const</span> <span class="keywordtype">int</span> error)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">static</span> <span class="keywordtype">char</span> error_buffer[255];</div>
<div class="line"> <a name="a1"></a><a class="code" href="group__lavu__error.html#ga5792b4a2d18d7d9cb0efbcfc335dce24">av_strerror</a>(error, error_buffer, <span class="keyword">sizeof</span>(error_buffer));</div>
<div class="line"> <span class="keywordflow">return</span> error_buffer;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Open an input file and the required decoder. */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a2"></a><a class="code" href="transcode__aac_8c.html#a8103e36bb4cb4141ee5e25acc350bc0b">open_input_file</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *filename,</div>
<div class="line"> <a name="_a3"></a><a class="code" href="structAVFormatContext.html">AVFormatContext</a> **input_format_context,</div>
<div class="line"> <a name="_a4"></a><a class="code" href="structAVCodecContext.html">AVCodecContext</a> **input_codec_context)</div>
<div class="line">{</div>
<div class="line"> <a name="_a5"></a><a class="code" href="structAVCodec.html">AVCodec</a> *input_codec;</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Open the input file to read from it. */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a6"></a><a class="code" href="group__lavf__decoding.html#ga31d601155e9035d5b0e7efedc894ee49">avformat_open_input</a>(input_format_context, filename, NULL,</div>
<div class="line"> NULL)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open input file '%s' (error '%s')\n"</span>,</div>
<div class="line"> filename, <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> *input_format_context = NULL;</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Get information on the input file (number of streams etc.). */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a7"></a><a class="code" href="group__lavf__decoding.html#gad42172e27cddafb81096939783b157bb">avformat_find_stream_info</a>(*input_format_context, NULL)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open find stream info (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <a name="a8"></a><a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4">avformat_close_input</a>(input_format_context);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Make sure that there is only one stream in the input file. */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((*input_format_context)->nb_streams != 1) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Expected one audio input stream, but found %d\n"</span>,</div>
<div class="line"> (*input_format_context)->nb_streams);</div>
<div class="line"> <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4">avformat_close_input</a>(input_format_context);</div>
<div class="line"> <span class="keywordflow">return</span> <a name="a9"></a><a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Find a decoder for the audio stream. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (!(input_codec = <a name="a10"></a><a class="code" href="group__lavc__decoding.html#ga19a0ca553277f019dd5b0fec6e1f9dca">avcodec_find_decoder</a>((*input_format_context)->streams[0]->codec->codec_id))) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not find input codec\n"</span>);</div>
<div class="line"> <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4">avformat_close_input</a>(input_format_context);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Open the decoder for the audio stream to use it later. */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a11"></a><a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d">avcodec_open2</a>((*input_format_context)->streams[0]->codec,</div>
<div class="line"> input_codec, NULL)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open input codec (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4">avformat_close_input</a>(input_format_context);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Save the decoder context for easier access later. */</span></div>
<div class="line"> *input_codec_context = (*input_format_context)->streams[0]-><a name="a12"></a><a class="code" href="structAVCodecContext.html#a6e606effa68724cae2ef5cc05f7fd9cb">codec</a>;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * Open an output file and the required encoder.</span></div>
<div class="line"><span class="comment"> * Also set some basic encoder parameters.</span></div>
<div class="line"><span class="comment"> * Some of these parameters are based on the input file's parameters.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a13"></a><a class="code" href="transcode__aac_8c.html#a617f4760254c119fc7caa222f3fcbd21">open_output_file</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *filename,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *input_codec_context,</div>
<div class="line"> <a class="code" href="structAVFormatContext.html">AVFormatContext</a> **output_format_context,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> **output_codec_context)</div>
<div class="line">{</div>
<div class="line"> <a name="_a14"></a><a class="code" href="structAVIOContext.html">AVIOContext</a> *output_io_context = NULL;</div>
<div class="line"> <a name="_a15"></a><a class="code" href="structAVStream.html">AVStream</a> *stream = NULL;</div>
<div class="line"> <a class="code" href="structAVCodec.html">AVCodec</a> *output_codec = NULL;</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Open the output file to write to it. */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a16"></a><a class="code" href="avio_8h.html#a371a670112abc5f3e15bc570da076301">avio_open</a>(&output_io_context, filename,</div>
<div class="line"> <a name="a17"></a><a class="code" href="avio_8h.html#a5c9308f296545a8f3b7687d277a6dabc">AVIO_FLAG_WRITE</a>)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open output file '%s' (error '%s')\n"</span>,</div>
<div class="line"> filename, <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Create a new format context for the output container format. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (!(*output_format_context = <a name="a18"></a><a class="code" href="group__lavf__core.html#gac7a91abf2f59648d995894711f070f62">avformat_alloc_context</a>())) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate output format context\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> <a name="a19"></a><a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Associate the output file (pointer) with the container format context. */</span></div>
<div class="line"> (*output_format_context)->pb = output_io_context;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Guess the desired container format based on the file extension. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (!((*output_format_context)->oformat = <a name="a20"></a><a class="code" href="group__lavf__encoding.html#ga8795680bd7489e96eeb5aef5e615cacc">av_guess_format</a>(NULL, filename,</div>
<div class="line"> NULL))) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not find output file format\n"</span>);</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <a name="a21"></a><a class="code" href="group__lavu__string.html#ga716447ae73b612bcf3a405b9b4608f6c">av_strlcpy</a>((*output_format_context)->filename, filename,</div>
<div class="line"> <span class="keyword">sizeof</span>((*output_format_context)->filename));</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Find the encoder to be used by its name. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (!(output_codec = <a name="a22"></a><a class="code" href="group__lavc__encoding.html#ga9f820c481615c3a02d0407bac0bdbf25">avcodec_find_encoder</a>(<a name="a23"></a><a class="code" href="group__lavc__core.html#ggaadca229ad2c20e060a14fec08a5cc7ceaadba4b5a087e2b6bf2acdd1b5aebb988">AV_CODEC_ID_AAC</a>))) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not find an AAC encoder.\n"</span>);</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Create a new audio stream in the output file container. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (!(stream = <a name="a24"></a><a class="code" href="group__lavf__core.html#gadcb0fd3e507d9b58fe78f61f8ad39827">avformat_new_stream</a>(*output_format_context, output_codec))) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not create new stream\n"</span>);</div>
<div class="line"> error = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Save the encoder context for easier access later. */</span></div>
<div class="line"> *output_codec_context = stream-><a name="a25"></a><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96">codec</a>;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Set the basic encoder parameters.</span></div>
<div class="line"><span class="comment"> * The input file's sample rate is used to avoid a sample rate conversion.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> (*output_codec_context)-><a name="a26"></a><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a> = <a name="a27"></a><a class="code" href="transcode__aac_8c.html#a4d4855d9b709af9628540e41e5ebb925">OUTPUT_CHANNELS</a>;</div>
<div class="line"> (*output_codec_context)->channel_layout = <a name="a28"></a><a class="code" href="group__channel__mask__c.html#gacb84f3e93a583e1f84a5283162a606a2">av_get_default_channel_layout</a>(<a class="code" href="transcode__aac_8c.html#a4d4855d9b709af9628540e41e5ebb925">OUTPUT_CHANNELS</a>);</div>
<div class="line"> (*output_codec_context)->sample_rate = input_codec_context-><a name="a29"></a><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a>;</div>
<div class="line"> (*output_codec_context)->sample_fmt = output_codec-><a name="a30"></a><a class="code" href="structAVCodec.html#aac19f4c45370f715412ad5c7b78daacf">sample_fmts</a>[0];</div>
<div class="line"> (*output_codec_context)->bit_rate = <a name="a31"></a><a class="code" href="transcode__aac_8c.html#a40d898a8dbfccabcbbff15a29924e97f">OUTPUT_BIT_RATE</a>;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Allow the use of the experimental AAC encoder */</span></div>
<div class="line"> (*output_codec_context)->strict_std_compliance = <a name="a32"></a><a class="code" href="avcodec_8h.html#a0e9f40024e3b017088ee1c16f25b3910">FF_COMPLIANCE_EXPERIMENTAL</a>;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Set the sample rate for the container. */</span></div>
<div class="line"> stream-><a name="a33"></a><a class="code" href="structAVStream.html#a9db755451f14e2bf590d4b85d82b32e6">time_base</a>.<a name="a34"></a><a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3">den</a> = input_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a>;</div>
<div class="line"> stream-><a class="code" href="structAVStream.html#a9db755451f14e2bf590d4b85d82b32e6">time_base</a>.<a name="a35"></a><a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9">num</a> = 1;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Some container formats (like MP4) require global headers to be present</span></div>
<div class="line"><span class="comment"> * Mark the encoder so that it behaves accordingly.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((*output_format_context)->oformat->flags & <a name="a36"></a><a class="code" href="avformat_8h.html#ab203c7b734e9c31b7c37d34f6e2c6aef">AVFMT_GLOBALHEADER</a>)</div>
<div class="line"> (*output_codec_context)->flags |= <a name="a37"></a><a class="code" href="group__lavc__core.html#ga9ed82634c59b339786575827c47a8f68">AV_CODEC_FLAG_GLOBAL_HEADER</a>;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Open the encoder for the audio stream to use it later. */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d">avcodec_open2</a>(*output_codec_context, output_codec, NULL)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open output codec (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line"></div>
<div class="line">cleanup:</div>
<div class="line"> <a name="a38"></a><a class="code" href="avio_8h.html#ae118a1f37f1e48617609ead9910aac15">avio_closep</a>(&(*output_format_context)->pb);</div>
<div class="line"> <a name="a39"></a><a class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445">avformat_free_context</a>(*output_format_context);</div>
<div class="line"> *output_format_context = NULL;</div>
<div class="line"> <span class="keywordflow">return</span> error < 0 ? error : <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Initialize one data packet for reading or writing. */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> <a name="a40"></a><a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990">init_packet</a>(<a name="_a41"></a><a class="code" href="structAVPacket.html">AVPacket</a> *packet)</div>
<div class="line">{</div>
<div class="line"> <a name="a42"></a><a class="code" href="group__lavc__packet.html#gac9cb9756175b96e7441575803757fb73">av_init_packet</a>(packet);<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Set the packet data and size so that it is recognized as being empty. */</span></div>
<div class="line"> packet-><a name="a43"></a><a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL;</div>
<div class="line"> packet-><a name="a44"></a><a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Initialize one audio frame for reading from the input file */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a45"></a><a class="code" href="transcode__aac_8c.html#a399b9ea45bcc6b114a3e0bef1c743a60">init_input_frame</a>(<a name="_a46"></a><a class="code" href="structAVFrame.html">AVFrame</a> **<a name="a47"></a><a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">if</span> (!(*frame = <a name="a48"></a><a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f">av_frame_alloc</a>())) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate input frame\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * Initialize the audio resampler based on the input and output codec settings.</span></div>
<div class="line"><span class="comment"> * If the input and output sample formats differ, a conversion is required</span></div>
<div class="line"><span class="comment"> * libswresample takes care of this, but requires initialization.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a49"></a><a class="code" href="transcode__aac_8c.html#a68b32c4f40838cc56a7f45d33286d039">init_resampler</a>(<a class="code" href="structAVCodecContext.html">AVCodecContext</a> *input_codec_context,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *output_codec_context,</div>
<div class="line"> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> **resample_context)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Create a resampler context for the conversion.</span></div>
<div class="line"><span class="comment"> * Set the conversion parameters.</span></div>
<div class="line"><span class="comment"> * Default channel layouts based on the number of channels</span></div>
<div class="line"><span class="comment"> * are assumed for simplicity (they are sometimes not detected</span></div>
<div class="line"><span class="comment"> * properly by the demuxer and/or decoder).</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> *resample_context = <a name="a50"></a><a class="code" href="group__lswr.html#gad7f29022726c871aadf935281a9813bc">swr_alloc_set_opts</a>(NULL,</div>
<div class="line"> <a class="code" href="group__channel__mask__c.html#gacb84f3e93a583e1f84a5283162a606a2">av_get_default_channel_layout</a>(output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>),</div>
<div class="line"> output_codec_context-><a name="a51"></a><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>,</div>
<div class="line"> output_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a>,</div>
<div class="line"> <a class="code" href="group__channel__mask__c.html#gacb84f3e93a583e1f84a5283162a606a2">av_get_default_channel_layout</a>(input_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>),</div>
<div class="line"> input_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>,</div>
<div class="line"> input_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a>,</div>
<div class="line"> 0, NULL);</div>
<div class="line"> <span class="keywordflow">if</span> (!*resample_context) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate resample context\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"> }<span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Perform a sanity check so that the number of converted samples is</span></div>
<div class="line"><span class="comment"> * not greater than the number of samples to be converted.</span></div>
<div class="line"><span class="comment"> * If the sample rates differ, this case has to be handled differently</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <a name="a52"></a><a class="code" href="avassert_8h.html#aae204192396f78cc8c5cd7ad5c57c23f">av_assert0</a>(output_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a> == input_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a>);</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Open the resampler with the specified parameters. */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a53"></a><a class="code" href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67">swr_init</a>(*resample_context)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open resample context\n"</span>);</div>
<div class="line"> <a name="a54"></a><a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34">swr_free</a>(resample_context);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Initialize a FIFO buffer for the audio samples to be encoded. */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a55"></a><a class="code" href="transcode__aac_8c.html#a96cd24fde0bde66e80f3141a1def94c6">init_fifo</a>(<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> **fifo, <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *output_codec_context)</div>
<div class="line">{<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Create the FIFO buffer based on the specified output sample format. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (!(*fifo = <a name="a56"></a><a class="code" href="group__lavu__audiofifo.html#ga9d792394f0615a329aec47847f8f8784">av_audio_fifo_alloc</a>(output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>,</div>
<div class="line"> output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>, 1))) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate FIFO\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Write the header of the output file container. */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a57"></a><a class="code" href="transcode__aac_8c.html#a717f7868fc24543151cb94b307e87420">write_output_file_header</a>(<a class="code" href="structAVFormatContext.html">AVFormatContext</a> *output_format_context)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a58"></a><a class="code" href="group__lavf__encoding.html#ga18b7b10bb5b94c4842de18166bc677cb">avformat_write_header</a>(output_format_context, NULL)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not write output file header (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Decode one audio frame from the input file. */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a59"></a><a class="code" href="transcode__aac_8c.html#a5c320cc89448244f68daee53092da98c">decode_audio_frame</a>(<a class="code" href="structAVFrame.html">AVFrame</a> *frame,</div>
<div class="line"> <a class="code" href="structAVFormatContext.html">AVFormatContext</a> *input_format_context,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *input_codec_context,</div>
<div class="line"> <span class="keywordtype">int</span> *data_present, <span class="keywordtype">int</span> *finished)</div>
<div class="line">{<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Packet used for temporary storage. */</span></div>
<div class="line"> <a class="code" href="structAVPacket.html">AVPacket</a> input_packet;</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990">init_packet</a>(&input_packet);</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Read one audio frame from the input file into a temporary packet. */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a60"></a><a class="code" href="group__lavf__decoding.html#ga4fdb3084415a82e3810de6ee60e46a61">av_read_frame</a>(input_format_context, &input_packet)) < 0) {<span class="comment"></span></div>
<div class="line"><span class="comment"> /** If we are at the end of the file, flush the decoder below. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (error == <a name="a61"></a><a class="code" href="group__lavu__error.html#gab4faa0afdf35076914824200331defff">AVERROR_EOF</a>)</div>
<div class="line"> *finished = 1;</div>
<div class="line"> <span class="keywordflow">else</span> {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not read frame (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Decode the audio frame stored in the temporary packet.</span></div>
<div class="line"><span class="comment"> * The input audio stream decoder is used to do this.</span></div>
<div class="line"><span class="comment"> * If we are at the end of the file, pass an empty packet to the decoder</span></div>
<div class="line"><span class="comment"> * to flush it.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a62"></a><a class="code" href="group__lavc__decoding.html#ga834bb1b062fbcc2de4cf7fb93f154a3e">avcodec_decode_audio4</a>(input_codec_context, frame,</div>
<div class="line"> data_present, &input_packet)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not decode frame (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <a name="a63"></a><a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&input_packet);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * If the decoder has not been flushed completely, we are not finished,</span></div>
<div class="line"><span class="comment"> * so that this function has to be called again.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (*finished && *data_present)</div>
<div class="line"> *finished = 0;</div>
<div class="line"> <a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&input_packet);</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * Initialize a temporary storage for the specified number of audio samples.</span></div>
<div class="line"><span class="comment"> * The conversion requires temporary storage due to the different format.</span></div>
<div class="line"><span class="comment"> * The number of audio samples to be allocated is specified in frame_size.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a64"></a><a class="code" href="transcode__aac_8c.html#af79f075aaf578455b0d2d435e395f1ff">init_converted_samples</a>(uint8_t ***converted_input_samples,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *output_codec_context,</div>
<div class="line"> <span class="keywordtype">int</span> frame_size)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Allocate as many pointers as there are audio channels.</span></div>
<div class="line"><span class="comment"> * Each pointer will later point to the audio samples of the corresponding</span></div>
<div class="line"><span class="comment"> * channels (although it may be NULL for interleaved formats).</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (!(*converted_input_samples = calloc(output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>,</div>
<div class="line"> <span class="keyword">sizeof</span>(**converted_input_samples)))) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate converted input sample pointers\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Allocate memory for the samples of all channels in one consecutive</span></div>
<div class="line"><span class="comment"> * block for convenience.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a65"></a><a class="code" href="group__lavu__sampmanip.html#ga4db4c77f928d32c7d8854732f50b8c04">av_samples_alloc</a>(*converted_input_samples, NULL,</div>
<div class="line"> output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>,</div>
<div class="line"> frame_size,</div>
<div class="line"> output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>, 0)) < 0) {</div>
<div class="line"> fprintf(stderr,</div>
<div class="line"> <span class="stringliteral">"Could not allocate converted input samples (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <a name="a66"></a><a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&(*converted_input_samples)[0]);</div>
<div class="line"> free(*converted_input_samples);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * Convert the input audio samples into the output sample format.</span></div>
<div class="line"><span class="comment"> * The conversion happens on a per-frame basis, the size of which is specified</span></div>
<div class="line"><span class="comment"> * by frame_size.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a67"></a><a class="code" href="transcode__aac_8c.html#af01916898adcdf3776690407bd1e2b82">convert_samples</a>(<span class="keyword">const</span> uint8_t **input_data,</div>
<div class="line"> uint8_t **converted_data, <span class="keyword">const</span> <span class="keywordtype">int</span> frame_size,</div>
<div class="line"> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *resample_context)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Convert the samples using the resampler. */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a68"></a><a class="code" href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a">swr_convert</a>(resample_context,</div>
<div class="line"> converted_data, frame_size,</div>
<div class="line"> input_data , frame_size)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not convert input samples (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Add converted input audio samples to the FIFO buffer for later processing. */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a69"></a><a class="code" href="transcode__aac_8c.html#a1509aea4299c0261c6c3f2a7bc8971d2">add_samples_to_fifo</a>(<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *fifo,</div>
<div class="line"> uint8_t **converted_input_samples,</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">int</span> frame_size)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Make the FIFO as large as it needs to be to hold both,</span></div>
<div class="line"><span class="comment"> * the old and the new samples.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a70"></a><a class="code" href="group__lavu__audiofifo.html#ga27c1e16e5f09940d6016b1971c0b5742">av_audio_fifo_realloc</a>(fifo, <a name="a71"></a><a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b">av_audio_fifo_size</a>(fifo) + frame_size)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not reallocate FIFO\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Store the new samples in the FIFO buffer. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a name="a72"></a><a class="code" href="group__lavu__audiofifo.html#ga0e7fadeea09c52a96eb4082a9e169bb4">av_audio_fifo_write</a>(fifo, (<span class="keywordtype">void</span> **)converted_input_samples,</div>
<div class="line"> frame_size) < frame_size) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not write data to FIFO\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * Read one audio frame from the input file, decodes, converts and stores</span></div>
<div class="line"><span class="comment"> * it in the FIFO buffer.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a73"></a><a class="code" href="transcode__aac_8c.html#a7f6cf47c64ae78cbdad6115e57aa2c2f">read_decode_convert_and_store</a>(<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *fifo,</div>
<div class="line"> <a class="code" href="structAVFormatContext.html">AVFormatContext</a> *input_format_context,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *input_codec_context,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *output_codec_context,</div>
<div class="line"> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *resampler_context,</div>
<div class="line"> <span class="keywordtype">int</span> *finished)</div>
<div class="line">{<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Temporary storage of the input samples of the frame read from the file. */</span></div>
<div class="line"> <a class="code" href="structAVFrame.html">AVFrame</a> *input_frame = NULL;<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Temporary storage for the converted input samples. */</span></div>
<div class="line"> uint8_t **converted_input_samples = NULL;</div>
<div class="line"> <span class="keywordtype">int</span> data_present;</div>
<div class="line"> <span class="keywordtype">int</span> ret = <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Initialize temporary storage for one input frame. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a399b9ea45bcc6b114a3e0bef1c743a60">init_input_frame</a>(&input_frame))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Decode one frame worth of audio samples. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a5c320cc89448244f68daee53092da98c">decode_audio_frame</a>(input_frame, input_format_context,</div>
<div class="line"> input_codec_context, &data_present, finished))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;<span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * If we are at the end of the file and there are no more samples</span></div>
<div class="line"><span class="comment"> * in the decoder which are delayed, we are actually finished.</span></div>
<div class="line"><span class="comment"> * This must not be treated as an error.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (*finished && !data_present) {</div>
<div class="line"> ret = 0;</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"> }<span class="comment"></span></div>
<div class="line"><span class="comment"> /** If there is decoded data, convert and store it */</span></div>
<div class="line"> <span class="keywordflow">if</span> (data_present) {<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Initialize the temporary storage for the converted input samples. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#af79f075aaf578455b0d2d435e395f1ff">init_converted_samples</a>(&converted_input_samples, output_codec_context,</div>
<div class="line"> input_frame-><a name="a74"></a><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea">nb_samples</a>))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Convert the input samples to the desired output sample format.</span></div>
<div class="line"><span class="comment"> * This requires a temporary storage provided by converted_input_samples.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#af01916898adcdf3776690407bd1e2b82">convert_samples</a>((<span class="keyword">const</span> uint8_t**)input_frame-><a name="a75"></a><a class="code" href="structAVFrame.html#afca04d808393822625e09b5ba91c6756">extended_data</a>, converted_input_samples,</div>
<div class="line"> input_frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea">nb_samples</a>, resampler_context))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Add the converted input samples to the FIFO buffer for later processing. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a1509aea4299c0261c6c3f2a7bc8971d2">add_samples_to_fifo</a>(fifo, converted_input_samples,</div>
<div class="line"> input_frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea">nb_samples</a>))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"> ret = 0;</div>
<div class="line"> }</div>
<div class="line"> ret = 0;</div>
<div class="line"></div>
<div class="line">cleanup:</div>
<div class="line"> <span class="keywordflow">if</span> (converted_input_samples) {</div>
<div class="line"> <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&converted_input_samples[0]);</div>
<div class="line"> free(converted_input_samples);</div>
<div class="line"> }</div>
<div class="line"> <a name="a76"></a><a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(&input_frame);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> ret;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * Initialize one input frame for writing to the output file.</span></div>
<div class="line"><span class="comment"> * The frame will be exactly frame_size samples large.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a77"></a><a class="code" href="transcode__aac_8c.html#a72741423006b4ab38bf924fa567e7081">init_output_frame</a>(<a class="code" href="structAVFrame.html">AVFrame</a> **frame,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *output_codec_context,</div>
<div class="line"> <span class="keywordtype">int</span> frame_size)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Create a new frame to store the audio samples. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (!(*frame = <a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f">av_frame_alloc</a>())) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate output frame\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Set the frame's parameters, especially its size and format.</span></div>
<div class="line"><span class="comment"> * av_frame_get_buffer needs this to allocate memory for the</span></div>
<div class="line"><span class="comment"> * audio samples of the frame.</span></div>
<div class="line"><span class="comment"> * Default channel layouts based on the number of channels</span></div>
<div class="line"><span class="comment"> * are assumed for simplicity.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> (*frame)->nb_samples = frame_size;</div>
<div class="line"> (*frame)->channel_layout = output_codec_context-><a name="a78"></a><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06">channel_layout</a>;</div>
<div class="line"> (*frame)->format = output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>;</div>
<div class="line"> (*frame)->sample_rate = output_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a>;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Allocate the samples of the created frame. This call will make</span></div>
<div class="line"><span class="comment"> * sure that the audio frame can hold as many samples as specified.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a79"></a><a class="code" href="group__lavu__frame.html#ga6b1acbfa82c79bf7fd78d868572f0ceb">av_frame_get_buffer</a>(*frame, 0)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could allocate output frame samples (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(frame);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Global timestamp for the audio frames */</span></div>
<div class="line"><span class="keyword">static</span> int64_t <a name="a80"></a><a class="code" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7">pts</a> = 0;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Encode one frame worth of audio to the output file. */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a81"></a><a class="code" href="transcode__aac_8c.html#a3d408f21612691f8c93a7aa24ea554ef">encode_audio_frame</a>(<a class="code" href="structAVFrame.html">AVFrame</a> *frame,</div>
<div class="line"> <a class="code" href="structAVFormatContext.html">AVFormatContext</a> *output_format_context,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *output_codec_context,</div>
<div class="line"> <span class="keywordtype">int</span> *data_present)</div>
<div class="line">{<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Packet used for temporary storage. */</span></div>
<div class="line"> <a class="code" href="structAVPacket.html">AVPacket</a> output_packet;</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990">init_packet</a>(&output_packet);</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Set a timestamp based on the sample rate for the container. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (frame) {</div>
<div class="line"> frame-><a name="a82"></a><a class="code" href="structAVFrame.html#a0452833e3ab6ddd7acbf82817a7818a4">pts</a> = <a class="code" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7">pts</a>;</div>
<div class="line"> pts += frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea">nb_samples</a>;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Encode the audio frame and store it in the temporary packet.</span></div>
<div class="line"><span class="comment"> * The output audio stream encoder is used to do this.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a83"></a><a class="code" href="group__lavc__encoding.html#ga93a49fbd0973b216dcb8a8c5dffe1d82">avcodec_encode_audio2</a>(output_codec_context, &output_packet,</div>
<div class="line"> frame, data_present)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not encode frame (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&output_packet);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Write one audio frame from the temporary packet to the output file. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (*data_present) {</div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a84"></a><a class="code" href="group__lavf__encoding.html#gaa85cc1774f18f306cd20a40fc50d0b36">av_write_frame</a>(output_format_context, &output_packet)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not write frame (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&output_packet);</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&output_packet);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * Load one audio frame from the FIFO buffer, encode and write it to the</span></div>
<div class="line"><span class="comment"> * output file.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a85"></a><a class="code" href="transcode__aac_8c.html#ab4367e0049c0bbd56eec8c525cdbd6e5">load_encode_and_write</a>(<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *fifo,</div>
<div class="line"> <a class="code" href="structAVFormatContext.html">AVFormatContext</a> *output_format_context,</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *output_codec_context)</div>
<div class="line">{<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Temporary storage of the output samples of the frame written to the file. */</span></div>
<div class="line"> <a class="code" href="structAVFrame.html">AVFrame</a> *output_frame;<span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Use the maximum number of possible samples per frame.</span></div>
<div class="line"><span class="comment"> * If there is less than the maximum possible frame size in the FIFO</span></div>
<div class="line"><span class="comment"> * buffer use this number. Otherwise, use the maximum possible frame size</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">int</span> frame_size = <a name="a86"></a><a class="code" href="common_8h.html#a0f84cbd7fd810cd678157c98cbfad4b0">FFMIN</a>(<a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b">av_audio_fifo_size</a>(fifo),</div>
<div class="line"> output_codec_context-><a name="a87"></a><a class="code" href="structAVCodecContext.html#aec57f0d859a6df8b479cd93ca3a44a33">frame_size</a>);</div>
<div class="line"> <span class="keywordtype">int</span> data_written;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Initialize temporary storage for one output frame. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a72741423006b4ab38bf924fa567e7081">init_output_frame</a>(&output_frame, output_codec_context, frame_size))</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Read as many samples from the FIFO buffer as required to fill the frame.</span></div>
<div class="line"><span class="comment"> * The samples are stored in the frame temporarily.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a name="a88"></a><a class="code" href="group__lavu__audiofifo.html#gab256fc29188d91311bd2fbd78eb356af">av_audio_fifo_read</a>(fifo, (<span class="keywordtype">void</span> **)output_frame-><a name="a89"></a><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992">data</a>, frame_size) < frame_size) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not read data from FIFO\n"</span>);</div>
<div class="line"> <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(&output_frame);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Encode one frame worth of audio samples. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a3d408f21612691f8c93a7aa24ea554ef">encode_audio_frame</a>(output_frame, output_format_context,</div>
<div class="line"> output_codec_context, &data_written)) {</div>
<div class="line"> <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(&output_frame);</div>
<div class="line"> <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"> }</div>
<div class="line"> <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(&output_frame);</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Write the trailer of the output file container. */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a90"></a><a class="code" href="transcode__aac_8c.html#aea497107d8d2a7a1e5bf92422ccc6715">write_output_file_trailer</a>(<a class="code" href="structAVFormatContext.html">AVFormatContext</a> *output_format_context)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">int</span> error;</div>
<div class="line"> <span class="keywordflow">if</span> ((error = <a name="a91"></a><a class="code" href="group__lavf__encoding.html#ga7f14007e7dc8f481f054b21614dfec13">av_write_trailer</a>(output_format_context)) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not write output file trailer (error '%s')\n"</span>,</div>
<div class="line"> <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">get_error_text</a>(error));</div>
<div class="line"> <span class="keywordflow">return</span> error;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/** Convert an audio file to an AAC file in an MP4 container. */</span></div>
<div class="line"><span class="keywordtype">int</span> <a name="a92"></a><a class="code" href="transcode__aac_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
<div class="line">{</div>
<div class="line"> <a class="code" href="structAVFormatContext.html">AVFormatContext</a> *input_format_context = NULL, *output_format_context = NULL;</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *input_codec_context = NULL, *output_codec_context = NULL;</div>
<div class="line"> <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863">SwrContext</a> *resample_context = NULL;</div>
<div class="line"> <a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f">AVAudioFifo</a> *fifo = NULL;</div>
<div class="line"> <span class="keywordtype">int</span> ret = <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b">AVERROR_EXIT</a>;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (argc < 3) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Usage: %s <input file> <output file>\n"</span>, argv[0]);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Register all codecs and formats so that they can be used. */</span></div>
<div class="line"> <a name="a93"></a><a class="code" href="group__lavf__core.html#ga917265caec45ef5a0646356ed1a507e3">av_register_all</a>();<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Open the input file for reading. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a8103e36bb4cb4141ee5e25acc350bc0b">open_input_file</a>(argv[1], &input_format_context,</div>
<div class="line"> &input_codec_context))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Open the output file for writing. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a617f4760254c119fc7caa222f3fcbd21">open_output_file</a>(argv[2], input_codec_context,</div>
<div class="line"> &output_format_context, &output_codec_context))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Initialize the resampler to be able to convert audio sample formats. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a68b32c4f40838cc56a7f45d33286d039">init_resampler</a>(input_codec_context, output_codec_context,</div>
<div class="line"> &resample_context))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Initialize the FIFO buffer to store audio samples to be encoded. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a96cd24fde0bde66e80f3141a1def94c6">init_fifo</a>(&fifo, output_codec_context))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Write the header of the output file container. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a717f7868fc24543151cb94b307e87420">write_output_file_header</a>(output_format_context))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Loop as long as we have input samples to read or output samples</span></div>
<div class="line"><span class="comment"> * to write; abort as soon as we have neither.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">while</span> (1) {<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Use the encoder's desired frame size for processing. */</span></div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">int</span> output_frame_size = output_codec_context->frame_size;</div>
<div class="line"> <span class="keywordtype">int</span> finished = 0;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Make sure that there is one frame worth of samples in the FIFO</span></div>
<div class="line"><span class="comment"> * buffer so that the encoder can do its work.</span></div>
<div class="line"><span class="comment"> * Since the decoder's and the encoder's frame size may differ, we</span></div>
<div class="line"><span class="comment"> * need to FIFO buffer to store as many frames worth of input samples</span></div>
<div class="line"><span class="comment"> * that they make up at least one frame worth of output samples.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">while</span> (<a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b">av_audio_fifo_size</a>(fifo) < output_frame_size) {<span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Decode one frame worth of audio samples, convert it to the</span></div>
<div class="line"><span class="comment"> * output sample format and put it into the FIFO buffer.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a7f6cf47c64ae78cbdad6115e57aa2c2f">read_decode_convert_and_store</a>(fifo, input_format_context,</div>
<div class="line"> input_codec_context,</div>
<div class="line"> output_codec_context,</div>
<div class="line"> resample_context, &finished))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * If we are at the end of the input file, we continue</span></div>
<div class="line"><span class="comment"> * encoding the remaining audio samples to the output file.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (finished)</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * If we have enough samples for the encoder, we encode them.</span></div>
<div class="line"><span class="comment"> * At the end of the file, we pass the remaining samples to</span></div>
<div class="line"><span class="comment"> * the encoder.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">while</span> (<a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b">av_audio_fifo_size</a>(fifo) >= output_frame_size ||</div>
<div class="line"> (finished && <a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b">av_audio_fifo_size</a>(fifo) > 0))<span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * Take one frame worth of audio samples from the FIFO buffer,</span></div>
<div class="line"><span class="comment"> * encode it and write it to the output file.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#ab4367e0049c0bbd56eec8c525cdbd6e5">load_encode_and_write</a>(fifo, output_format_context,</div>
<div class="line"> output_codec_context))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /**</span></div>
<div class="line"><span class="comment"> * If we are at the end of the input file and have encoded</span></div>
<div class="line"><span class="comment"> * all remaining samples, we can exit this loop and finish.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (finished) {</div>
<div class="line"> <span class="keywordtype">int</span> data_written;<span class="comment"></span></div>
<div class="line"><span class="comment"> /** Flush the encoder as it may have delayed frames. */</span></div>
<div class="line"> <span class="keywordflow">do</span> {</div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a3d408f21612691f8c93a7aa24ea554ef">encode_audio_frame</a>(NULL, output_format_context,</div>
<div class="line"> output_codec_context, &data_written))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"> } <span class="keywordflow">while</span> (data_written);</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> /** Write the trailer of the output file container. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#aea497107d8d2a7a1e5bf92422ccc6715">write_output_file_trailer</a>(output_format_context))</div>
<div class="line"> <span class="keywordflow">goto</span> cleanup;</div>
<div class="line"> ret = 0;</div>
<div class="line"></div>
<div class="line">cleanup:</div>
<div class="line"> <span class="keywordflow">if</span> (fifo)</div>
<div class="line"> <a name="a94"></a><a class="code" href="group__lavu__audiofifo.html#ga74e029e47f7aa99217ad1f315c434875">av_audio_fifo_free</a>(fifo);</div>
<div class="line"> <a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34">swr_free</a>(&resample_context);</div>
<div class="line"> <span class="keywordflow">if</span> (output_codec_context)</div>
<div class="line"> <a name="a95"></a><a class="code" href="group__lavc__core.html#gaf4daa92361efb3523ef5afeb0b54077f">avcodec_close</a>(output_codec_context);</div>
<div class="line"> <span class="keywordflow">if</span> (output_format_context) {</div>
<div class="line"> <a class="code" href="avio_8h.html#ae118a1f37f1e48617609ead9910aac15">avio_closep</a>(&output_format_context->pb);</div>
<div class="line"> <a class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445">avformat_free_context</a>(output_format_context);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (input_codec_context)</div>
<div class="line"> <a class="code" href="group__lavc__core.html#gaf4daa92361efb3523ef5afeb0b54077f">avcodec_close</a>(input_codec_context);</div>
<div class="line"> <span class="keywordflow">if</span> (input_format_context)</div>
<div class="line"> <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4">avformat_close_input</a>(&input_format_context);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> ret;</div>
<div class="line">}</div>
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