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<div class="title">doc/examples/transcode_aac.c</div> </div>
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<a href="transcode__aac_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * This file is part of FFmpeg.</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00006"></a>00006 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00007"></a>00007 <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00012"></a>00012 <span class="comment"> * Lesser General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
<a name="l00015"></a>00015 <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span>
<a name="l00016"></a>00016 <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span>
<a name="l00017"></a>00017 <span class="comment"> */</span>
<a name="l00018"></a>00018 <span class="comment"></span>
<a name="l00019"></a>00019 <span class="comment">/**</span>
<a name="l00020"></a>00020 <span class="comment"> * @file</span>
<a name="l00021"></a>00021 <span class="comment"> * simple audio converter</span>
<a name="l00022"></a>00022 <span class="comment"> *</span>
<a name="l00023"></a>00023 <span class="comment"> * @example transcode_aac.c</span>
<a name="l00024"></a>00024 <span class="comment"> * Convert an input audio file to AAC in an MP4 container using FFmpeg.</span>
<a name="l00025"></a>00025 <span class="comment"> * @author Andreas Unterweger (dustsigns@gmail.com)</span>
<a name="l00026"></a>00026 <span class="comment"> */</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="preprocessor">#include <stdio.h></span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="avformat_8h.html" title="Main libavformat public API header.">libavformat/avformat.h</a>"</span>
<a name="l00031"></a>00031 <span class="preprocessor">#include "<a class="code" href="avio_8h.html" title="Buffered I/O operations.">libavformat/avio.h</a>"</span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="preprocessor">#include "<a class="code" href="libavcodec_2avcodec_8h.html" title="Libavcodec external API header.">libavcodec/avcodec.h</a>"</span>
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="preprocessor">#include "<a class="code" href="audio__fifo_8h.html" title="Audio FIFO Buffer.">libavutil/audio_fifo.h</a>"</span>
<a name="l00036"></a>00036 <span class="preprocessor">#include "<a class="code" href="avassert_8h.html" title="simple assert() macros that are a bit more flexible than ISO C assert().">libavutil/avassert.h</a>"</span>
<a name="l00037"></a>00037 <span class="preprocessor">#include "<a class="code" href="avstring_8h.html">libavutil/avstring.h</a>"</span>
<a name="l00038"></a>00038 <span class="preprocessor">#include "<a class="code" href="frame_8h.html" title="reference-counted frame API">libavutil/frame.h</a>"</span>
<a name="l00039"></a>00039 <span class="preprocessor">#include "<a class="code" href="opt_8h.html" title="AVOptions.">libavutil/opt.h</a>"</span>
<a name="l00040"></a>00040
<a name="l00041"></a>00041 <span class="preprocessor">#include "<a class="code" href="swresample_8h.html" title="libswresample public header">libswresample/swresample.h</a>"</span>
<a name="l00042"></a>00042 <span class="comment"></span>
<a name="l00043"></a>00043 <span class="comment">/** The output bit rate in kbit/s */</span>
<a name="l00044"></a><a class="code" href="transcode__aac_8c.html#a40d898a8dbfccabcbbff15a29924e97f">00044</a> <span class="preprocessor">#define OUTPUT_BIT_RATE 96000</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span><span class="comment">/** The number of output channels */</span>
<a name="l00046"></a><a class="code" href="transcode__aac_8c.html#a4d4855d9b709af9628540e41e5ebb925">00046</a> <span class="preprocessor">#define OUTPUT_CHANNELS 2</span>
<a name="l00047"></a>00047 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00048"></a>00048 <span class="comment">/**</span>
<a name="l00049"></a>00049 <span class="comment"> * Convert an error code into a text message.</span>
<a name="l00050"></a>00050 <span class="comment"> * @param error Error code to be converted</span>
<a name="l00051"></a>00051 <span class="comment"> * @return Corresponding error text (not thread-safe)</span>
<a name="l00052"></a>00052 <span class="comment"> */</span>
<a name="l00053"></a><a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c">00053</a> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(<span class="keyword">const</span> <span class="keywordtype">int</span> error)
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 <span class="keyword">static</span> <span class="keywordtype">char</span> error_buffer[255];
<a name="l00056"></a>00056 <a class="code" href="group__lavu__error.html#ga5792b4a2d18d7d9cb0efbcfc335dce24" title="Put a description of the AVERROR code errnum in errbuf.">av_strerror</a>(error, error_buffer, <span class="keyword">sizeof</span>(error_buffer));
<a name="l00057"></a>00057 <span class="keywordflow">return</span> error_buffer;
<a name="l00058"></a>00058 }
<a name="l00059"></a>00059 <span class="comment"></span>
<a name="l00060"></a>00060 <span class="comment">/** Open an input file and the required decoder. */</span>
<a name="l00061"></a><a class="code" href="transcode__aac_8c.html#a8103e36bb4cb4141ee5e25acc350bc0b">00061</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a8103e36bb4cb4141ee5e25acc350bc0b" title="Open an input file and the required decoder.">open_input_file</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *filename,
<a name="l00062"></a>00062 <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> **input_format_context,
<a name="l00063"></a>00063 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> **input_codec_context)
<a name="l00064"></a>00064 {
<a name="l00065"></a>00065 <a class="code" href="structAVCodec.html" title="AVCodec.">AVCodec</a> *input_codec;
<a name="l00066"></a>00066 <span class="keywordtype">int</span> error;
<a name="l00067"></a>00067 <span class="comment"></span>
<a name="l00068"></a>00068 <span class="comment"> /** Open the input file to read from it. */</span>
<a name="l00069"></a>00069 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavf__decoding.html#ga10a404346c646e4ab58f4ed798baca32" title="Open an input stream and read the header.">avformat_open_input</a>(input_format_context, filename, NULL,
<a name="l00070"></a>00070 NULL)) < 0) {
<a name="l00071"></a>00071 fprintf(stderr, <span class="stringliteral">"Could not open input file '%s' (error '%s')\n"</span>,
<a name="l00072"></a>00072 filename, <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00073"></a>00073 *input_format_context = NULL;
<a name="l00074"></a>00074 <span class="keywordflow">return</span> error;
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 <span class="comment"></span>
<a name="l00077"></a>00077 <span class="comment"> /** Get information on the input file (number of streams etc.). */</span>
<a name="l00078"></a>00078 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavf__decoding.html#gad42172e27cddafb81096939783b157bb" title="Read packets of a media file to get stream information.">avformat_find_stream_info</a>(*input_format_context, NULL)) < 0) {
<a name="l00079"></a>00079 fprintf(stderr, <span class="stringliteral">"Could not open find stream info (error '%s')\n"</span>,
<a name="l00080"></a>00080 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00081"></a>00081 <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(input_format_context);
<a name="l00082"></a>00082 <span class="keywordflow">return</span> error;
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084 <span class="comment"></span>
<a name="l00085"></a>00085 <span class="comment"> /** Make sure that there is only one stream in the input file. */</span>
<a name="l00086"></a>00086 <span class="keywordflow">if</span> ((*input_format_context)->nb_streams != 1) {
<a name="l00087"></a>00087 fprintf(stderr, <span class="stringliteral">"Expected one audio input stream, but found %d\n"</span>,
<a name="l00088"></a>00088 (*input_format_context)->nb_streams);
<a name="l00089"></a>00089 <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(input_format_context);
<a name="l00090"></a>00090 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092 <span class="comment"></span>
<a name="l00093"></a>00093 <span class="comment"> /** Find a decoder for the audio stream. */</span>
<a name="l00094"></a>00094 <span class="keywordflow">if</span> (!(input_codec = <a class="code" href="group__lavc__decoding.html#ga19a0ca553277f019dd5b0fec6e1f9dca" title="Find a registered decoder with a matching codec ID.">avcodec_find_decoder</a>((*input_format_context)->streams[0]->codec->codec_id))) {
<a name="l00095"></a>00095 fprintf(stderr, <span class="stringliteral">"Could not find input codec\n"</span>);
<a name="l00096"></a>00096 <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(input_format_context);
<a name="l00097"></a>00097 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099 <span class="comment"></span>
<a name="l00100"></a>00100 <span class="comment"> /** Open the decoder for the audio stream to use it later. */</span>
<a name="l00101"></a>00101 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d" title="Initialize the AVCodecContext to use the given AVCodec.">avcodec_open2</a>((*input_format_context)->streams[0]->codec,
<a name="l00102"></a>00102 input_codec, NULL)) < 0) {
<a name="l00103"></a>00103 fprintf(stderr, <span class="stringliteral">"Could not open input codec (error '%s')\n"</span>,
<a name="l00104"></a>00104 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00105"></a>00105 <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(input_format_context);
<a name="l00106"></a>00106 <span class="keywordflow">return</span> error;
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108 <span class="comment"></span>
<a name="l00109"></a>00109 <span class="comment"> /** Save the decoder context for easier access later. */</span>
<a name="l00110"></a>00110 *input_codec_context = (*input_format_context)->streams[0]-><a class="code" href="structAVCodecContext.html#ab00398f08f8622c3e6c0f1a12eb99808">codec</a>;
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="keywordflow">return</span> 0;
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114 <span class="comment"></span>
<a name="l00115"></a>00115 <span class="comment">/**</span>
<a name="l00116"></a>00116 <span class="comment"> * Open an output file and the required encoder.</span>
<a name="l00117"></a>00117 <span class="comment"> * Also set some basic encoder parameters.</span>
<a name="l00118"></a>00118 <span class="comment"> * Some of these parameters are based on the input file's parameters.</span>
<a name="l00119"></a>00119 <span class="comment"> */</span>
<a name="l00120"></a><a class="code" href="transcode__aac_8c.html#a617f4760254c119fc7caa222f3fcbd21">00120</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a617f4760254c119fc7caa222f3fcbd21" title="Open an output file and the required encoder.">open_output_file</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *filename,
<a name="l00121"></a>00121 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context,
<a name="l00122"></a>00122 <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> **output_format_context,
<a name="l00123"></a>00123 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> **output_codec_context)
<a name="l00124"></a>00124 {
<a name="l00125"></a>00125 <a class="code" href="structAVIOContext.html" title="Bytestream IO Context.">AVIOContext</a> *output_io_context = NULL;
<a name="l00126"></a>00126 <a class="code" href="structAVStream.html" title="Stream structure.">AVStream</a> *stream = NULL;
<a name="l00127"></a>00127 <a class="code" href="structAVCodec.html" title="AVCodec.">AVCodec</a> *output_codec = NULL;
<a name="l00128"></a>00128 <span class="keywordtype">int</span> error;
<a name="l00129"></a>00129 <span class="comment"></span>
<a name="l00130"></a>00130 <span class="comment"> /** Open the output file to write to it. */</span>
<a name="l00131"></a>00131 <span class="keywordflow">if</span> ((error = <a class="code" href="avio_8h.html#a371a670112abc5f3e15bc570da076301" title="Create and initialize a AVIOContext for accessing the resource indicated by url.">avio_open</a>(&output_io_context, filename,
<a name="l00132"></a>00132 <a class="code" href="avio_8h.html#a5c9308f296545a8f3b7687d277a6dabc" title="write-only">AVIO_FLAG_WRITE</a>)) < 0) {
<a name="l00133"></a>00133 fprintf(stderr, <span class="stringliteral">"Could not open output file '%s' (error '%s')\n"</span>,
<a name="l00134"></a>00134 filename, <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00135"></a>00135 <span class="keywordflow">return</span> error;
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137 <span class="comment"></span>
<a name="l00138"></a>00138 <span class="comment"> /** Create a new format context for the output container format. */</span>
<a name="l00139"></a>00139 <span class="keywordflow">if</span> (!(*output_format_context = <a class="code" href="group__lavf__core.html#gac7a91abf2f59648d995894711f070f62" title="Allocate an AVFormatContext.">avformat_alloc_context</a>())) {
<a name="l00140"></a>00140 fprintf(stderr, <span class="stringliteral">"Could not allocate output format context\n"</span>);
<a name="l00141"></a>00141 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 <span class="comment"></span>
<a name="l00144"></a>00144 <span class="comment"> /** Associate the output file (pointer) with the container format context. */</span>
<a name="l00145"></a>00145 (*output_format_context)->pb = output_io_context;
<a name="l00146"></a>00146 <span class="comment"></span>
<a name="l00147"></a>00147 <span class="comment"> /** Guess the desired container format based on the file extension. */</span>
<a name="l00148"></a>00148 <span class="keywordflow">if</span> (!((*output_format_context)->oformat = <a class="code" href="group__lavf__encoding.html#ga8795680bd7489e96eeb5aef5e615cacc" title="Return the output format in the list of registered output formats which best matches the provided par...">av_guess_format</a>(NULL, filename,
<a name="l00149"></a>00149 NULL))) {
<a name="l00150"></a>00150 fprintf(stderr, <span class="stringliteral">"Could not find output file format\n"</span>);
<a name="l00151"></a>00151 <span class="keywordflow">goto</span> cleanup;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <a class="code" href="group__lavu__string.html#ga716447ae73b612bcf3a405b9b4608f6c" title="Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.">av_strlcpy</a>((*output_format_context)->filename, filename,
<a name="l00155"></a>00155 <span class="keyword">sizeof</span>((*output_format_context)->filename));
<a name="l00156"></a>00156 <span class="comment"></span>
<a name="l00157"></a>00157 <span class="comment"> /** Find the encoder to be used by its name. */</span>
<a name="l00158"></a>00158 <span class="keywordflow">if</span> (!(output_codec = <a class="code" href="group__lavc__encoding.html#ga9f820c481615c3a02d0407bac0bdbf25" title="Find a registered encoder with a matching codec ID.">avcodec_find_encoder</a>(AV_CODEC_ID_AAC))) {
<a name="l00159"></a>00159 fprintf(stderr, <span class="stringliteral">"Could not find an AAC encoder.\n"</span>);
<a name="l00160"></a>00160 <span class="keywordflow">goto</span> cleanup;
<a name="l00161"></a>00161 }
<a name="l00162"></a>00162 <span class="comment"></span>
<a name="l00163"></a>00163 <span class="comment"> /** Create a new audio stream in the output file container. */</span>
<a name="l00164"></a>00164 <span class="keywordflow">if</span> (!(stream = <a class="code" href="group__lavf__core.html#gadcb0fd3e507d9b58fe78f61f8ad39827" title="Add a new stream to a media file.">avformat_new_stream</a>(*output_format_context, output_codec))) {
<a name="l00165"></a>00165 fprintf(stderr, <span class="stringliteral">"Could not create new stream\n"</span>);
<a name="l00166"></a>00166 error = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<a name="l00167"></a>00167 <span class="keywordflow">goto</span> cleanup;
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169 <span class="comment"></span>
<a name="l00170"></a>00170 <span class="comment"> /** Save the encoder context for easier access later. */</span>
<a name="l00171"></a>00171 *output_codec_context = stream-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>;
<a name="l00172"></a>00172 <span class="comment"></span>
<a name="l00173"></a>00173 <span class="comment"> /**</span>
<a name="l00174"></a>00174 <span class="comment"> * Set the basic encoder parameters.</span>
<a name="l00175"></a>00175 <span class="comment"> * The input file's sample rate is used to avoid a sample rate conversion.</span>
<a name="l00176"></a>00176 <span class="comment"> */</span>
<a name="l00177"></a>00177 (*output_codec_context)-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a> = <a class="code" href="transcode__aac_8c.html#a4d4855d9b709af9628540e41e5ebb925" title="The number of output channels.">OUTPUT_CHANNELS</a>;
<a name="l00178"></a>00178 (*output_codec_context)->channel_layout = <a class="code" href="group__channel__mask__c.html#gacb84f3e93a583e1f84a5283162a606a2" title="Return default channel layout for a given number of channels.">av_get_default_channel_layout</a>(<a class="code" href="transcode__aac_8c.html#a4d4855d9b709af9628540e41e5ebb925" title="The number of output channels.">OUTPUT_CHANNELS</a>);
<a name="l00179"></a>00179 (*output_codec_context)->sample_rate = input_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>;
<a name="l00180"></a>00180 (*output_codec_context)->sample_fmt = output_codec-><a class="code" href="structAVCodec.html#aac19f4c45370f715412ad5c7b78daacf" title="array of supported sample formats, or NULL if unknown, array is terminated by -1">sample_fmts</a>[0];
<a name="l00181"></a>00181 (*output_codec_context)->bit_rate = <a class="code" href="transcode__aac_8c.html#a40d898a8dbfccabcbbff15a29924e97f" title="The output bit rate in kbit/s.">OUTPUT_BIT_RATE</a>;
<a name="l00182"></a>00182 <span class="comment"></span>
<a name="l00183"></a>00183 <span class="comment"> /** Allow the use of the experimental AAC encoder */</span>
<a name="l00184"></a>00184 (*output_codec_context)->strict_std_compliance = <a class="code" href="libavcodec_2avcodec_8h.html#a0e9f40024e3b017088ee1c16f25b3910" title="Allow nonstandardized experimental things.">FF_COMPLIANCE_EXPERIMENTAL</a>;
<a name="l00185"></a>00185 <span class="comment"></span>
<a name="l00186"></a>00186 <span class="comment"> /** Set the sample rate for the container. */</span>
<a name="l00187"></a>00187 stream-><a class="code" href="structAVStream.html#a9db755451f14e2bf590d4b85d82b32e6" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a>.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3" title="denominator">den</a> = input_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>;
<a name="l00188"></a>00188 stream-><a class="code" href="structAVStream.html#a9db755451f14e2bf590d4b85d82b32e6" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a>.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9" title="numerator">num</a> = 1;
<a name="l00189"></a>00189 <span class="comment"></span>
<a name="l00190"></a>00190 <span class="comment"> /**</span>
<a name="l00191"></a>00191 <span class="comment"> * Some container formats (like MP4) require global headers to be present</span>
<a name="l00192"></a>00192 <span class="comment"> * Mark the encoder so that it behaves accordingly.</span>
<a name="l00193"></a>00193 <span class="comment"> */</span>
<a name="l00194"></a>00194 <span class="keywordflow">if</span> ((*output_format_context)->oformat->flags & <a class="code" href="avformat_8h.html#ab203c7b734e9c31b7c37d34f6e2c6aef" title="Format wants global header.">AVFMT_GLOBALHEADER</a>)
<a name="l00195"></a>00195 (*output_codec_context)->flags |= <a class="code" href="group__lavc__core.html#gaab6ceefd617cf265ef7ea1b87ed5933e" title="Place global headers in extradata instead of every keyframe.">CODEC_FLAG_GLOBAL_HEADER</a>;
<a name="l00196"></a>00196 <span class="comment"></span>
<a name="l00197"></a>00197 <span class="comment"> /** Open the encoder for the audio stream to use it later. */</span>
<a name="l00198"></a>00198 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d" title="Initialize the AVCodecContext to use the given AVCodec.">avcodec_open2</a>(*output_codec_context, output_codec, NULL)) < 0) {
<a name="l00199"></a>00199 fprintf(stderr, <span class="stringliteral">"Could not open output codec (error '%s')\n"</span>,
<a name="l00200"></a>00200 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00201"></a>00201 <span class="keywordflow">goto</span> cleanup;
<a name="l00202"></a>00202 }
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="keywordflow">return</span> 0;
<a name="l00205"></a>00205
<a name="l00206"></a>00206 cleanup:
<a name="l00207"></a>00207 <a class="code" href="avio_8h.html#ae118a1f37f1e48617609ead9910aac15" title="Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...">avio_closep</a>(&(*output_format_context)->pb);
<a name="l00208"></a>00208 <a class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445" title="Free an AVFormatContext and all its streams.">avformat_free_context</a>(*output_format_context);
<a name="l00209"></a>00209 *output_format_context = NULL;
<a name="l00210"></a>00210 <span class="keywordflow">return</span> error < 0 ? error : <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00211"></a>00211 }
<a name="l00212"></a>00212 <span class="comment"></span>
<a name="l00213"></a>00213 <span class="comment">/** Initialize one data packet for reading or writing. */</span>
<a name="l00214"></a><a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990">00214</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990" title="Initialize one data packet for reading or writing.">init_packet</a>(<a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> *packet)
<a name="l00215"></a>00215 {
<a name="l00216"></a>00216 <a class="code" href="group__lavc__packet.html#gac9cb9756175b96e7441575803757fb73" title="Initialize optional fields of a packet with default values.">av_init_packet</a>(packet);<span class="comment"></span>
<a name="l00217"></a>00217 <span class="comment"> /** Set the packet data and size so that it is recognized as being empty. */</span>
<a name="l00218"></a>00218 packet-><a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL;
<a name="l00219"></a>00219 packet-><a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;
<a name="l00220"></a>00220 }
<a name="l00221"></a>00221 <span class="comment"></span>
<a name="l00222"></a>00222 <span class="comment">/** Initialize one audio frame for reading from the input file */</span>
<a name="l00223"></a><a class="code" href="transcode__aac_8c.html#a399b9ea45bcc6b114a3e0bef1c743a60">00223</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a399b9ea45bcc6b114a3e0bef1c743a60" title="Initialize one audio frame for reading from the input file.">init_input_frame</a>(<a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> **<a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>)
<a name="l00224"></a>00224 {
<a name="l00225"></a>00225 <span class="keywordflow">if</span> (!(*frame = <a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f" title="Allocate an AVFrame and set its fields to default values.">av_frame_alloc</a>())) {
<a name="l00226"></a>00226 fprintf(stderr, <span class="stringliteral">"Could not allocate input frame\n"</span>);
<a name="l00227"></a>00227 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<a name="l00228"></a>00228 }
<a name="l00229"></a>00229 <span class="keywordflow">return</span> 0;
<a name="l00230"></a>00230 }
<a name="l00231"></a>00231 <span class="comment"></span>
<a name="l00232"></a>00232 <span class="comment">/**</span>
<a name="l00233"></a>00233 <span class="comment"> * Initialize the audio resampler based on the input and output codec settings.</span>
<a name="l00234"></a>00234 <span class="comment"> * If the input and output sample formats differ, a conversion is required</span>
<a name="l00235"></a>00235 <span class="comment"> * libswresample takes care of this, but requires initialization.</span>
<a name="l00236"></a>00236 <span class="comment"> */</span>
<a name="l00237"></a><a class="code" href="transcode__aac_8c.html#a68b32c4f40838cc56a7f45d33286d039">00237</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a68b32c4f40838cc56a7f45d33286d039" title="Initialize the audio resampler based on the input and output codec settings.">init_resampler</a>(<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context,
<a name="l00238"></a>00238 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<a name="l00239"></a>00239 <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> **resample_context)
<a name="l00240"></a>00240 {
<a name="l00241"></a>00241 <span class="keywordtype">int</span> error;
<a name="l00242"></a>00242 <span class="comment"></span>
<a name="l00243"></a>00243 <span class="comment"> /**</span>
<a name="l00244"></a>00244 <span class="comment"> * Create a resampler context for the conversion.</span>
<a name="l00245"></a>00245 <span class="comment"> * Set the conversion parameters.</span>
<a name="l00246"></a>00246 <span class="comment"> * Default channel layouts based on the number of channels</span>
<a name="l00247"></a>00247 <span class="comment"> * are assumed for simplicity (they are sometimes not detected</span>
<a name="l00248"></a>00248 <span class="comment"> * properly by the demuxer and/or decoder).</span>
<a name="l00249"></a>00249 <span class="comment"> */</span>
<a name="l00250"></a>00250 *resample_context = <a class="code" href="group__lswr.html#gad7f29022726c871aadf935281a9813bc" title="Allocate SwrContext if needed and set/reset common parameters.">swr_alloc_set_opts</a>(NULL,
<a name="l00251"></a>00251 <a class="code" href="group__channel__mask__c.html#gacb84f3e93a583e1f84a5283162a606a2" title="Return default channel layout for a given number of channels.">av_get_default_channel_layout</a>(output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>),
<a name="l00252"></a>00252 output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>,
<a name="l00253"></a>00253 output_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>,
<a name="l00254"></a>00254 <a class="code" href="group__channel__mask__c.html#gacb84f3e93a583e1f84a5283162a606a2" title="Return default channel layout for a given number of channels.">av_get_default_channel_layout</a>(input_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>),
<a name="l00255"></a>00255 input_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>,
<a name="l00256"></a>00256 input_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>,
<a name="l00257"></a>00257 0, NULL);
<a name="l00258"></a>00258 <span class="keywordflow">if</span> (!*resample_context) {
<a name="l00259"></a>00259 fprintf(stderr, <span class="stringliteral">"Could not allocate resample context\n"</span>);
<a name="l00260"></a>00260 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<a name="l00261"></a>00261 }<span class="comment"></span>
<a name="l00262"></a>00262 <span class="comment"> /**</span>
<a name="l00263"></a>00263 <span class="comment"> * Perform a sanity check so that the number of converted samples is</span>
<a name="l00264"></a>00264 <span class="comment"> * not greater than the number of samples to be converted.</span>
<a name="l00265"></a>00265 <span class="comment"> * If the sample rates differ, this case has to be handled differently</span>
<a name="l00266"></a>00266 <span class="comment"> */</span>
<a name="l00267"></a>00267 <a class="code" href="avassert_8h.html#aae204192396f78cc8c5cd7ad5c57c23f" title="assert() equivalent, that is always enabled.">av_assert0</a>(output_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a> == input_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>);
<a name="l00268"></a>00268 <span class="comment"></span>
<a name="l00269"></a>00269 <span class="comment"> /** Open the resampler with the specified parameters. */</span>
<a name="l00270"></a>00270 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67" title="Initialize context after user parameters have been set.">swr_init</a>(*resample_context)) < 0) {
<a name="l00271"></a>00271 fprintf(stderr, <span class="stringliteral">"Could not open resample context\n"</span>);
<a name="l00272"></a>00272 <a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34" title="Free the given SwrContext and set the pointer to NULL.">swr_free</a>(resample_context);
<a name="l00273"></a>00273 <span class="keywordflow">return</span> error;
<a name="l00274"></a>00274 }
<a name="l00275"></a>00275 <span class="keywordflow">return</span> 0;
<a name="l00276"></a>00276 }
<a name="l00277"></a>00277 <span class="comment"></span>
<a name="l00278"></a>00278 <span class="comment">/** Initialize a FIFO buffer for the audio samples to be encoded. */</span>
<a name="l00279"></a><a class="code" href="transcode__aac_8c.html#a96cd24fde0bde66e80f3141a1def94c6">00279</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a96cd24fde0bde66e80f3141a1def94c6" title="Initialize a FIFO buffer for the audio samples to be encoded.">init_fifo</a>(<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f" title="Context for an Audio FIFO Buffer.">AVAudioFifo</a> **fifo, <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context)
<a name="l00280"></a>00280 {<span class="comment"></span>
<a name="l00281"></a>00281 <span class="comment"> /** Create the FIFO buffer based on the specified output sample format. */</span>
<a name="l00282"></a>00282 <span class="keywordflow">if</span> (!(*fifo = <a class="code" href="group__lavu__audiofifo.html#ga9d792394f0615a329aec47847f8f8784" title="Allocate an AVAudioFifo.">av_audio_fifo_alloc</a>(output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>,
<a name="l00283"></a>00283 output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>, 1))) {
<a name="l00284"></a>00284 fprintf(stderr, <span class="stringliteral">"Could not allocate FIFO\n"</span>);
<a name="l00285"></a>00285 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<a name="l00286"></a>00286 }
<a name="l00287"></a>00287 <span class="keywordflow">return</span> 0;
<a name="l00288"></a>00288 }
<a name="l00289"></a>00289 <span class="comment"></span>
<a name="l00290"></a>00290 <span class="comment">/** Write the header of the output file container. */</span>
<a name="l00291"></a><a class="code" href="transcode__aac_8c.html#a717f7868fc24543151cb94b307e87420">00291</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a717f7868fc24543151cb94b307e87420" title="Write the header of the output file container.">write_output_file_header</a>(<a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *output_format_context)
<a name="l00292"></a>00292 {
<a name="l00293"></a>00293 <span class="keywordtype">int</span> error;
<a name="l00294"></a>00294 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavf__encoding.html#ga78d4e734fecb1d2385536e6dd5b7b9f5" title="Allocate the stream private data and write the stream header to an output media file.">avformat_write_header</a>(output_format_context, NULL)) < 0) {
<a name="l00295"></a>00295 fprintf(stderr, <span class="stringliteral">"Could not write output file header (error '%s')\n"</span>,
<a name="l00296"></a>00296 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00297"></a>00297 <span class="keywordflow">return</span> error;
<a name="l00298"></a>00298 }
<a name="l00299"></a>00299 <span class="keywordflow">return</span> 0;
<a name="l00300"></a>00300 }
<a name="l00301"></a>00301 <span class="comment"></span>
<a name="l00302"></a>00302 <span class="comment">/** Decode one audio frame from the input file. */</span>
<a name="l00303"></a><a class="code" href="transcode__aac_8c.html#a5c320cc89448244f68daee53092da98c">00303</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a5c320cc89448244f68daee53092da98c" title="Decode one audio frame from the input file.">decode_audio_frame</a>(<a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> *<a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>,
<a name="l00304"></a>00304 <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *input_format_context,
<a name="l00305"></a>00305 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context,
<a name="l00306"></a>00306 <span class="keywordtype">int</span> *data_present, <span class="keywordtype">int</span> *finished)
<a name="l00307"></a>00307 {<span class="comment"></span>
<a name="l00308"></a>00308 <span class="comment"> /** Packet used for temporary storage. */</span>
<a name="l00309"></a>00309 <a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> input_packet;
<a name="l00310"></a>00310 <span class="keywordtype">int</span> error;
<a name="l00311"></a>00311 <a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990" title="Initialize one data packet for reading or writing.">init_packet</a>(&input_packet);
<a name="l00312"></a>00312 <span class="comment"></span>
<a name="l00313"></a>00313 <span class="comment"> /** Read one audio frame from the input file into a temporary packet. */</span>
<a name="l00314"></a>00314 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavf__decoding.html#ga4fdb3084415a82e3810de6ee60e46a61" title="Return the next frame of a stream.">av_read_frame</a>(input_format_context, &input_packet)) < 0) {<span class="comment"></span>
<a name="l00315"></a>00315 <span class="comment"> /** If we are at the end of the file, flush the decoder below. */</span>
<a name="l00316"></a>00316 <span class="keywordflow">if</span> (error == <a class="code" href="group__lavu__error.html#gab4faa0afdf35076914824200331defff" title="End of file.">AVERROR_EOF</a>)
<a name="l00317"></a>00317 *finished = 1;
<a name="l00318"></a>00318 <span class="keywordflow">else</span> {
<a name="l00319"></a>00319 fprintf(stderr, <span class="stringliteral">"Could not read frame (error '%s')\n"</span>,
<a name="l00320"></a>00320 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00321"></a>00321 <span class="keywordflow">return</span> error;
<a name="l00322"></a>00322 }
<a name="l00323"></a>00323 }
<a name="l00324"></a>00324 <span class="comment"></span>
<a name="l00325"></a>00325 <span class="comment"> /**</span>
<a name="l00326"></a>00326 <span class="comment"> * Decode the audio frame stored in the temporary packet.</span>
<a name="l00327"></a>00327 <span class="comment"> * The input audio stream decoder is used to do this.</span>
<a name="l00328"></a>00328 <span class="comment"> * If we are at the end of the file, pass an empty packet to the decoder</span>
<a name="l00329"></a>00329 <span class="comment"> * to flush it.</span>
<a name="l00330"></a>00330 <span class="comment"> */</span>
<a name="l00331"></a>00331 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavc__decoding.html#ga834bb1b062fbcc2de4cf7fb93f154a3e" title="Decode the audio frame of size avpkt->size from avpkt->data into frame.">avcodec_decode_audio4</a>(input_codec_context, frame,
<a name="l00332"></a>00332 data_present, &input_packet)) < 0) {
<a name="l00333"></a>00333 fprintf(stderr, <span class="stringliteral">"Could not decode frame (error '%s')\n"</span>,
<a name="l00334"></a>00334 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00335"></a>00335 <a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&input_packet);
<a name="l00336"></a>00336 <span class="keywordflow">return</span> error;
<a name="l00337"></a>00337 }
<a name="l00338"></a>00338 <span class="comment"></span>
<a name="l00339"></a>00339 <span class="comment"> /**</span>
<a name="l00340"></a>00340 <span class="comment"> * If the decoder has not been flushed completely, we are not finished,</span>
<a name="l00341"></a>00341 <span class="comment"> * so that this function has to be called again.</span>
<a name="l00342"></a>00342 <span class="comment"> */</span>
<a name="l00343"></a>00343 <span class="keywordflow">if</span> (*finished && *data_present)
<a name="l00344"></a>00344 *finished = 0;
<a name="l00345"></a>00345 <a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&input_packet);
<a name="l00346"></a>00346 <span class="keywordflow">return</span> 0;
<a name="l00347"></a>00347 }
<a name="l00348"></a>00348 <span class="comment"></span>
<a name="l00349"></a>00349 <span class="comment">/**</span>
<a name="l00350"></a>00350 <span class="comment"> * Initialize a temporary storage for the specified number of audio samples.</span>
<a name="l00351"></a>00351 <span class="comment"> * The conversion requires temporary storage due to the different format.</span>
<a name="l00352"></a>00352 <span class="comment"> * The number of audio samples to be allocated is specified in frame_size.</span>
<a name="l00353"></a>00353 <span class="comment"> */</span>
<a name="l00354"></a><a class="code" href="transcode__aac_8c.html#af79f075aaf578455b0d2d435e395f1ff">00354</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#af79f075aaf578455b0d2d435e395f1ff" title="Initialize a temporary storage for the specified number of audio samples.">init_converted_samples</a>(uint8_t ***converted_input_samples,
<a name="l00355"></a>00355 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<a name="l00356"></a>00356 <span class="keywordtype">int</span> frame_size)
<a name="l00357"></a>00357 {
<a name="l00358"></a>00358 <span class="keywordtype">int</span> error;
<a name="l00359"></a>00359 <span class="comment"></span>
<a name="l00360"></a>00360 <span class="comment"> /**</span>
<a name="l00361"></a>00361 <span class="comment"> * Allocate as many pointers as there are audio channels.</span>
<a name="l00362"></a>00362 <span class="comment"> * Each pointer will later point to the audio samples of the corresponding</span>
<a name="l00363"></a>00363 <span class="comment"> * channels (although it may be NULL for interleaved formats).</span>
<a name="l00364"></a>00364 <span class="comment"> */</span>
<a name="l00365"></a>00365 <span class="keywordflow">if</span> (!(*converted_input_samples = calloc(output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>,
<a name="l00366"></a>00366 <span class="keyword">sizeof</span>(**converted_input_samples)))) {
<a name="l00367"></a>00367 fprintf(stderr, <span class="stringliteral">"Could not allocate converted input sample pointers\n"</span>);
<a name="l00368"></a>00368 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<a name="l00369"></a>00369 }
<a name="l00370"></a>00370 <span class="comment"></span>
<a name="l00371"></a>00371 <span class="comment"> /**</span>
<a name="l00372"></a>00372 <span class="comment"> * Allocate memory for the samples of all channels in one consecutive</span>
<a name="l00373"></a>00373 <span class="comment"> * block for convenience.</span>
<a name="l00374"></a>00374 <span class="comment"> */</span>
<a name="l00375"></a>00375 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavu__sampmanip.html#ga4db4c77f928d32c7d8854732f50b8c04" title="Allocate a samples buffer for nb_samples samples, and fill data pointers and linesize accordingly...">av_samples_alloc</a>(*converted_input_samples, NULL,
<a name="l00376"></a>00376 output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>,
<a name="l00377"></a>00377 frame_size,
<a name="l00378"></a>00378 output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>, 0)) < 0) {
<a name="l00379"></a>00379 fprintf(stderr,
<a name="l00380"></a>00380 <span class="stringliteral">"Could not allocate converted input samples (error '%s')\n"</span>,
<a name="l00381"></a>00381 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00382"></a>00382 <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...">av_freep</a>(&(*converted_input_samples)[0]);
<a name="l00383"></a>00383 free(*converted_input_samples);
<a name="l00384"></a>00384 <span class="keywordflow">return</span> error;
<a name="l00385"></a>00385 }
<a name="l00386"></a>00386 <span class="keywordflow">return</span> 0;
<a name="l00387"></a>00387 }
<a name="l00388"></a>00388 <span class="comment"></span>
<a name="l00389"></a>00389 <span class="comment">/**</span>
<a name="l00390"></a>00390 <span class="comment"> * Convert the input audio samples into the output sample format.</span>
<a name="l00391"></a>00391 <span class="comment"> * The conversion happens on a per-frame basis, the size of which is specified</span>
<a name="l00392"></a>00392 <span class="comment"> * by frame_size.</span>
<a name="l00393"></a>00393 <span class="comment"> */</span>
<a name="l00394"></a><a class="code" href="transcode__aac_8c.html#af01916898adcdf3776690407bd1e2b82">00394</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#af01916898adcdf3776690407bd1e2b82" title="Convert the input audio samples into the output sample format.">convert_samples</a>(<span class="keyword">const</span> uint8_t **input_data,
<a name="l00395"></a>00395 uint8_t **converted_data, <span class="keyword">const</span> <span class="keywordtype">int</span> frame_size,
<a name="l00396"></a>00396 <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> *resample_context)
<a name="l00397"></a>00397 {
<a name="l00398"></a>00398 <span class="keywordtype">int</span> error;
<a name="l00399"></a>00399 <span class="comment"></span>
<a name="l00400"></a>00400 <span class="comment"> /** Convert the samples using the resampler. */</span>
<a name="l00401"></a>00401 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a" title="Convert audio.">swr_convert</a>(resample_context,
<a name="l00402"></a>00402 converted_data, frame_size,
<a name="l00403"></a>00403 input_data , frame_size)) < 0) {
<a name="l00404"></a>00404 fprintf(stderr, <span class="stringliteral">"Could not convert input samples (error '%s')\n"</span>,
<a name="l00405"></a>00405 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00406"></a>00406 <span class="keywordflow">return</span> error;
<a name="l00407"></a>00407 }
<a name="l00408"></a>00408
<a name="l00409"></a>00409 <span class="keywordflow">return</span> 0;
<a name="l00410"></a>00410 }
<a name="l00411"></a>00411 <span class="comment"></span>
<a name="l00412"></a>00412 <span class="comment">/** Add converted input audio samples to the FIFO buffer for later processing. */</span>
<a name="l00413"></a><a class="code" href="transcode__aac_8c.html#a1509aea4299c0261c6c3f2a7bc8971d2">00413</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a1509aea4299c0261c6c3f2a7bc8971d2" title="Add converted input audio samples to the FIFO buffer for later processing.">add_samples_to_fifo</a>(<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f" title="Context for an Audio FIFO Buffer.">AVAudioFifo</a> *fifo,
<a name="l00414"></a>00414 uint8_t **converted_input_samples,
<a name="l00415"></a>00415 <span class="keyword">const</span> <span class="keywordtype">int</span> frame_size)
<a name="l00416"></a>00416 {
<a name="l00417"></a>00417 <span class="keywordtype">int</span> error;
<a name="l00418"></a>00418 <span class="comment"></span>
<a name="l00419"></a>00419 <span class="comment"> /**</span>
<a name="l00420"></a>00420 <span class="comment"> * Make the FIFO as large as it needs to be to hold both,</span>
<a name="l00421"></a>00421 <span class="comment"> * the old and the new samples.</span>
<a name="l00422"></a>00422 <span class="comment"> */</span>
<a name="l00423"></a>00423 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavu__audiofifo.html#gae34e4eb0928f8e4539730d8c044c6139" title="Reallocate an AVAudioFifo.">av_audio_fifo_realloc</a>(fifo, <a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b" title="Get the current number of samples in the AVAudioFifo available for reading.">av_audio_fifo_size</a>(fifo) + frame_size)) < 0) {
<a name="l00424"></a>00424 fprintf(stderr, <span class="stringliteral">"Could not reallocate FIFO\n"</span>);
<a name="l00425"></a>00425 <span class="keywordflow">return</span> error;
<a name="l00426"></a>00426 }
<a name="l00427"></a>00427 <span class="comment"></span>
<a name="l00428"></a>00428 <span class="comment"> /** Store the new samples in the FIFO buffer. */</span>
<a name="l00429"></a>00429 <span class="keywordflow">if</span> (<a class="code" href="group__lavu__audiofifo.html#ga0e7fadeea09c52a96eb4082a9e169bb4" title="Write data to an AVAudioFifo.">av_audio_fifo_write</a>(fifo, (<span class="keywordtype">void</span> **)converted_input_samples,
<a name="l00430"></a>00430 frame_size) < frame_size) {
<a name="l00431"></a>00431 fprintf(stderr, <span class="stringliteral">"Could not write data to FIFO\n"</span>);
<a name="l00432"></a>00432 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00433"></a>00433 }
<a name="l00434"></a>00434 <span class="keywordflow">return</span> 0;
<a name="l00435"></a>00435 }
<a name="l00436"></a>00436 <span class="comment"></span>
<a name="l00437"></a>00437 <span class="comment">/**</span>
<a name="l00438"></a>00438 <span class="comment"> * Read one audio frame from the input file, decodes, converts and stores</span>
<a name="l00439"></a>00439 <span class="comment"> * it in the FIFO buffer.</span>
<a name="l00440"></a>00440 <span class="comment"> */</span>
<a name="l00441"></a><a class="code" href="transcode__aac_8c.html#a7f6cf47c64ae78cbdad6115e57aa2c2f">00441</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a7f6cf47c64ae78cbdad6115e57aa2c2f" title="Read one audio frame from the input file, decodes, converts and stores it in the FIFO buffer...">read_decode_convert_and_store</a>(<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f" title="Context for an Audio FIFO Buffer.">AVAudioFifo</a> *fifo,
<a name="l00442"></a>00442 <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *input_format_context,
<a name="l00443"></a>00443 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context,
<a name="l00444"></a>00444 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<a name="l00445"></a>00445 <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> *resampler_context,
<a name="l00446"></a>00446 <span class="keywordtype">int</span> *finished)
<a name="l00447"></a>00447 {<span class="comment"></span>
<a name="l00448"></a>00448 <span class="comment"> /** Temporary storage of the input samples of the frame read from the file. */</span>
<a name="l00449"></a>00449 <a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> *input_frame = NULL;<span class="comment"></span>
<a name="l00450"></a>00450 <span class="comment"> /** Temporary storage for the converted input samples. */</span>
<a name="l00451"></a>00451 uint8_t **converted_input_samples = NULL;
<a name="l00452"></a>00452 <span class="keywordtype">int</span> data_present;
<a name="l00453"></a>00453 <span class="keywordtype">int</span> ret = <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00454"></a>00454 <span class="comment"></span>
<a name="l00455"></a>00455 <span class="comment"> /** Initialize temporary storage for one input frame. */</span>
<a name="l00456"></a>00456 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a399b9ea45bcc6b114a3e0bef1c743a60" title="Initialize one audio frame for reading from the input file.">init_input_frame</a>(&input_frame))
<a name="l00457"></a>00457 <span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<a name="l00458"></a>00458 <span class="comment"> /** Decode one frame worth of audio samples. */</span>
<a name="l00459"></a>00459 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a5c320cc89448244f68daee53092da98c" title="Decode one audio frame from the input file.">decode_audio_frame</a>(input_frame, input_format_context,
<a name="l00460"></a>00460 input_codec_context, &data_present, finished))
<a name="l00461"></a>00461 <span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<a name="l00462"></a>00462 <span class="comment"> /**</span>
<a name="l00463"></a>00463 <span class="comment"> * If we are at the end of the file and there are no more samples</span>
<a name="l00464"></a>00464 <span class="comment"> * in the decoder which are delayed, we are actually finished.</span>
<a name="l00465"></a>00465 <span class="comment"> * This must not be treated as an error.</span>
<a name="l00466"></a>00466 <span class="comment"> */</span>
<a name="l00467"></a>00467 <span class="keywordflow">if</span> (*finished && !data_present) {
<a name="l00468"></a>00468 ret = 0;
<a name="l00469"></a>00469 <span class="keywordflow">goto</span> cleanup;
<a name="l00470"></a>00470 }<span class="comment"></span>
<a name="l00471"></a>00471 <span class="comment"> /** If there is decoded data, convert and store it */</span>
<a name="l00472"></a>00472 <span class="keywordflow">if</span> (data_present) {<span class="comment"></span>
<a name="l00473"></a>00473 <span class="comment"> /** Initialize the temporary storage for the converted input samples. */</span>
<a name="l00474"></a>00474 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#af79f075aaf578455b0d2d435e395f1ff" title="Initialize a temporary storage for the specified number of audio samples.">init_converted_samples</a>(&converted_input_samples, output_codec_context,
<a name="l00475"></a>00475 input_frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a>))
<a name="l00476"></a>00476 <span class="keywordflow">goto</span> cleanup;
<a name="l00477"></a>00477 <span class="comment"></span>
<a name="l00478"></a>00478 <span class="comment"> /**</span>
<a name="l00479"></a>00479 <span class="comment"> * Convert the input samples to the desired output sample format.</span>
<a name="l00480"></a>00480 <span class="comment"> * This requires a temporary storage provided by converted_input_samples.</span>
<a name="l00481"></a>00481 <span class="comment"> */</span>
<a name="l00482"></a>00482 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#af01916898adcdf3776690407bd1e2b82" title="Convert the input audio samples into the output sample format.">convert_samples</a>((<span class="keyword">const</span> uint8_t**)input_frame-><a class="code" href="structAVFrame.html#afca04d808393822625e09b5ba91c6756" title="pointers to the data planes/channels.">extended_data</a>, converted_input_samples,
<a name="l00483"></a>00483 input_frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a>, resampler_context))
<a name="l00484"></a>00484 <span class="keywordflow">goto</span> cleanup;
<a name="l00485"></a>00485 <span class="comment"></span>
<a name="l00486"></a>00486 <span class="comment"> /** Add the converted input samples to the FIFO buffer for later processing. */</span>
<a name="l00487"></a>00487 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a1509aea4299c0261c6c3f2a7bc8971d2" title="Add converted input audio samples to the FIFO buffer for later processing.">add_samples_to_fifo</a>(fifo, converted_input_samples,
<a name="l00488"></a>00488 input_frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a>))
<a name="l00489"></a>00489 <span class="keywordflow">goto</span> cleanup;
<a name="l00490"></a>00490 ret = 0;
<a name="l00491"></a>00491 }
<a name="l00492"></a>00492 ret = 0;
<a name="l00493"></a>00493
<a name="l00494"></a>00494 cleanup:
<a name="l00495"></a>00495 <span class="keywordflow">if</span> (converted_input_samples) {
<a name="l00496"></a>00496 <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...">av_freep</a>(&converted_input_samples[0]);
<a name="l00497"></a>00497 free(converted_input_samples);
<a name="l00498"></a>00498 }
<a name="l00499"></a>00499 <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc" title="Free the frame and any dynamically allocated objects in it, e.g.">av_frame_free</a>(&input_frame);
<a name="l00500"></a>00500
<a name="l00501"></a>00501 <span class="keywordflow">return</span> ret;
<a name="l00502"></a>00502 }
<a name="l00503"></a>00503 <span class="comment"></span>
<a name="l00504"></a>00504 <span class="comment">/**</span>
<a name="l00505"></a>00505 <span class="comment"> * Initialize one input frame for writing to the output file.</span>
<a name="l00506"></a>00506 <span class="comment"> * The frame will be exactly frame_size samples large.</span>
<a name="l00507"></a>00507 <span class="comment"> */</span>
<a name="l00508"></a><a class="code" href="transcode__aac_8c.html#a72741423006b4ab38bf924fa567e7081">00508</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a72741423006b4ab38bf924fa567e7081" title="Initialize one input frame for writing to the output file.">init_output_frame</a>(<a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> **<a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>,
<a name="l00509"></a>00509 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<a name="l00510"></a>00510 <span class="keywordtype">int</span> frame_size)
<a name="l00511"></a>00511 {
<a name="l00512"></a>00512 <span class="keywordtype">int</span> error;
<a name="l00513"></a>00513 <span class="comment"></span>
<a name="l00514"></a>00514 <span class="comment"> /** Create a new frame to store the audio samples. */</span>
<a name="l00515"></a>00515 <span class="keywordflow">if</span> (!(*frame = <a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f" title="Allocate an AVFrame and set its fields to default values.">av_frame_alloc</a>())) {
<a name="l00516"></a>00516 fprintf(stderr, <span class="stringliteral">"Could not allocate output frame\n"</span>);
<a name="l00517"></a>00517 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00518"></a>00518 }
<a name="l00519"></a>00519 <span class="comment"></span>
<a name="l00520"></a>00520 <span class="comment"> /**</span>
<a name="l00521"></a>00521 <span class="comment"> * Set the frame's parameters, especially its size and format.</span>
<a name="l00522"></a>00522 <span class="comment"> * av_frame_get_buffer needs this to allocate memory for the</span>
<a name="l00523"></a>00523 <span class="comment"> * audio samples of the frame.</span>
<a name="l00524"></a>00524 <span class="comment"> * Default channel layouts based on the number of channels</span>
<a name="l00525"></a>00525 <span class="comment"> * are assumed for simplicity.</span>
<a name="l00526"></a>00526 <span class="comment"> */</span>
<a name="l00527"></a>00527 (*frame)->nb_samples = frame_size;
<a name="l00528"></a>00528 (*frame)->channel_layout = output_codec_context-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a>;
<a name="l00529"></a>00529 (*frame)->format = output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>;
<a name="l00530"></a>00530 (*frame)->sample_rate = output_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>;
<a name="l00531"></a>00531 <span class="comment"></span>
<a name="l00532"></a>00532 <span class="comment"> /**</span>
<a name="l00533"></a>00533 <span class="comment"> * Allocate the samples of the created frame. This call will make</span>
<a name="l00534"></a>00534 <span class="comment"> * sure that the audio frame can hold as many samples as specified.</span>
<a name="l00535"></a>00535 <span class="comment"> */</span>
<a name="l00536"></a>00536 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavu__frame.html#ga6b1acbfa82c79bf7fd78d868572f0ceb" title="Allocate new buffer(s) for audio or video data.">av_frame_get_buffer</a>(*frame, 0)) < 0) {
<a name="l00537"></a>00537 fprintf(stderr, <span class="stringliteral">"Could allocate output frame samples (error '%s')\n"</span>,
<a name="l00538"></a>00538 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00539"></a>00539 <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc" title="Free the frame and any dynamically allocated objects in it, e.g.">av_frame_free</a>(frame);
<a name="l00540"></a>00540 <span class="keywordflow">return</span> error;
<a name="l00541"></a>00541 }
<a name="l00542"></a>00542
<a name="l00543"></a>00543 <span class="keywordflow">return</span> 0;
<a name="l00544"></a>00544 }
<a name="l00545"></a>00545 <span class="comment"></span>
<a name="l00546"></a>00546 <span class="comment">/** Global timestamp for the audio frames */</span>
<a name="l00547"></a><a class="code" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7">00547</a> <span class="keyword">static</span> int64_t <a class="code" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7" title="Global timestamp for the audio frames.">pts</a> = 0;
<a name="l00548"></a>00548 <span class="comment"></span>
<a name="l00549"></a>00549 <span class="comment">/** Encode one frame worth of audio to the output file. */</span>
<a name="l00550"></a><a class="code" href="transcode__aac_8c.html#a3d408f21612691f8c93a7aa24ea554ef">00550</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#a3d408f21612691f8c93a7aa24ea554ef" title="Encode one frame worth of audio to the output file.">encode_audio_frame</a>(<a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> *<a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>,
<a name="l00551"></a>00551 <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *output_format_context,
<a name="l00552"></a>00552 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<a name="l00553"></a>00553 <span class="keywordtype">int</span> *data_present)
<a name="l00554"></a>00554 {<span class="comment"></span>
<a name="l00555"></a>00555 <span class="comment"> /** Packet used for temporary storage. */</span>
<a name="l00556"></a>00556 <a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> output_packet;
<a name="l00557"></a>00557 <span class="keywordtype">int</span> error;
<a name="l00558"></a>00558 <a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990" title="Initialize one data packet for reading or writing.">init_packet</a>(&output_packet);
<a name="l00559"></a>00559 <span class="comment"></span>
<a name="l00560"></a>00560 <span class="comment"> /** Set a timestamp based on the sample rate for the container. */</span>
<a name="l00561"></a>00561 <span class="keywordflow">if</span> (frame) {
<a name="l00562"></a>00562 frame-><a class="code" href="structAVFrame.html#a0452833e3ab6ddd7acbf82817a7818a4" title="Presentation timestamp in time_base units (time when frame should be shown to user).">pts</a> = <a class="code" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7" title="Global timestamp for the audio frames.">pts</a>;
<a name="l00563"></a>00563 <a class="code" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7" title="Global timestamp for the audio frames.">pts</a> += frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a>;
<a name="l00564"></a>00564 }
<a name="l00565"></a>00565 <span class="comment"></span>
<a name="l00566"></a>00566 <span class="comment"> /**</span>
<a name="l00567"></a>00567 <span class="comment"> * Encode the audio frame and store it in the temporary packet.</span>
<a name="l00568"></a>00568 <span class="comment"> * The output audio stream encoder is used to do this.</span>
<a name="l00569"></a>00569 <span class="comment"> */</span>
<a name="l00570"></a>00570 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavc__encoding.html#ga93a49fbd0973b216dcb8a8c5dffe1d82" title="Encode a frame of audio.">avcodec_encode_audio2</a>(output_codec_context, &output_packet,
<a name="l00571"></a>00571 frame, data_present)) < 0) {
<a name="l00572"></a>00572 fprintf(stderr, <span class="stringliteral">"Could not encode frame (error '%s')\n"</span>,
<a name="l00573"></a>00573 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00574"></a>00574 <a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&output_packet);
<a name="l00575"></a>00575 <span class="keywordflow">return</span> error;
<a name="l00576"></a>00576 }
<a name="l00577"></a>00577 <span class="comment"></span>
<a name="l00578"></a>00578 <span class="comment"> /** Write one audio frame from the temporary packet to the output file. */</span>
<a name="l00579"></a>00579 <span class="keywordflow">if</span> (*data_present) {
<a name="l00580"></a>00580 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavf__encoding.html#gaa85cc1774f18f306cd20a40fc50d0b36" title="Write a packet to an output media file.">av_write_frame</a>(output_format_context, &output_packet)) < 0) {
<a name="l00581"></a>00581 fprintf(stderr, <span class="stringliteral">"Could not write frame (error '%s')\n"</span>,
<a name="l00582"></a>00582 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00583"></a>00583 <a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&output_packet);
<a name="l00584"></a>00584 <span class="keywordflow">return</span> error;
<a name="l00585"></a>00585 }
<a name="l00586"></a>00586
<a name="l00587"></a>00587 <a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&output_packet);
<a name="l00588"></a>00588 }
<a name="l00589"></a>00589
<a name="l00590"></a>00590 <span class="keywordflow">return</span> 0;
<a name="l00591"></a>00591 }
<a name="l00592"></a>00592 <span class="comment"></span>
<a name="l00593"></a>00593 <span class="comment">/**</span>
<a name="l00594"></a>00594 <span class="comment"> * Load one audio frame from the FIFO buffer, encode and write it to the</span>
<a name="l00595"></a>00595 <span class="comment"> * output file.</span>
<a name="l00596"></a>00596 <span class="comment"> */</span>
<a name="l00597"></a><a class="code" href="transcode__aac_8c.html#ab4367e0049c0bbd56eec8c525cdbd6e5">00597</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#ab4367e0049c0bbd56eec8c525cdbd6e5" title="Load one audio frame from the FIFO buffer, encode and write it to the output file.">load_encode_and_write</a>(<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f" title="Context for an Audio FIFO Buffer.">AVAudioFifo</a> *fifo,
<a name="l00598"></a>00598 <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *output_format_context,
<a name="l00599"></a>00599 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context)
<a name="l00600"></a>00600 {<span class="comment"></span>
<a name="l00601"></a>00601 <span class="comment"> /** Temporary storage of the output samples of the frame written to the file. */</span>
<a name="l00602"></a>00602 <a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> *output_frame;<span class="comment"></span>
<a name="l00603"></a>00603 <span class="comment"> /**</span>
<a name="l00604"></a>00604 <span class="comment"> * Use the maximum number of possible samples per frame.</span>
<a name="l00605"></a>00605 <span class="comment"> * If there is less than the maximum possible frame size in the FIFO</span>
<a name="l00606"></a>00606 <span class="comment"> * buffer use this number. Otherwise, use the maximum possible frame size</span>
<a name="l00607"></a>00607 <span class="comment"> */</span>
<a name="l00608"></a>00608 <span class="keyword">const</span> <span class="keywordtype">int</span> frame_size = <a class="code" href="common_8h.html#a0f84cbd7fd810cd678157c98cbfad4b0">FFMIN</a>(<a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b" title="Get the current number of samples in the AVAudioFifo available for reading.">av_audio_fifo_size</a>(fifo),
<a name="l00609"></a>00609 output_codec_context-><a class="code" href="structAVCodecContext.html#aec57f0d859a6df8b479cd93ca3a44a33" title="Number of samples per channel in an audio frame.">frame_size</a>);
<a name="l00610"></a>00610 <span class="keywordtype">int</span> data_written;
<a name="l00611"></a>00611 <span class="comment"></span>
<a name="l00612"></a>00612 <span class="comment"> /** Initialize temporary storage for one output frame. */</span>
<a name="l00613"></a>00613 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a72741423006b4ab38bf924fa567e7081" title="Initialize one input frame for writing to the output file.">init_output_frame</a>(&output_frame, output_codec_context, frame_size))
<a name="l00614"></a>00614 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00615"></a>00615 <span class="comment"></span>
<a name="l00616"></a>00616 <span class="comment"> /**</span>
<a name="l00617"></a>00617 <span class="comment"> * Read as many samples from the FIFO buffer as required to fill the frame.</span>
<a name="l00618"></a>00618 <span class="comment"> * The samples are stored in the frame temporarily.</span>
<a name="l00619"></a>00619 <span class="comment"> */</span>
<a name="l00620"></a>00620 <span class="keywordflow">if</span> (<a class="code" href="group__lavu__audiofifo.html#gab256fc29188d91311bd2fbd78eb356af" title="Read data from an AVAudioFifo.">av_audio_fifo_read</a>(fifo, (<span class="keywordtype">void</span> **)output_frame-><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992" title="pointer to the picture/channel planes.">data</a>, frame_size) < frame_size) {
<a name="l00621"></a>00621 fprintf(stderr, <span class="stringliteral">"Could not read data from FIFO\n"</span>);
<a name="l00622"></a>00622 <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc" title="Free the frame and any dynamically allocated objects in it, e.g.">av_frame_free</a>(&output_frame);
<a name="l00623"></a>00623 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00624"></a>00624 }
<a name="l00625"></a>00625 <span class="comment"></span>
<a name="l00626"></a>00626 <span class="comment"> /** Encode one frame worth of audio samples. */</span>
<a name="l00627"></a>00627 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a3d408f21612691f8c93a7aa24ea554ef" title="Encode one frame worth of audio to the output file.">encode_audio_frame</a>(output_frame, output_format_context,
<a name="l00628"></a>00628 output_codec_context, &data_written)) {
<a name="l00629"></a>00629 <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc" title="Free the frame and any dynamically allocated objects in it, e.g.">av_frame_free</a>(&output_frame);
<a name="l00630"></a>00630 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00631"></a>00631 }
<a name="l00632"></a>00632 <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc" title="Free the frame and any dynamically allocated objects in it, e.g.">av_frame_free</a>(&output_frame);
<a name="l00633"></a>00633 <span class="keywordflow">return</span> 0;
<a name="l00634"></a>00634 }
<a name="l00635"></a>00635 <span class="comment"></span>
<a name="l00636"></a>00636 <span class="comment">/** Write the trailer of the output file container. */</span>
<a name="l00637"></a><a class="code" href="transcode__aac_8c.html#aea497107d8d2a7a1e5bf92422ccc6715">00637</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="transcode__aac_8c.html#aea497107d8d2a7a1e5bf92422ccc6715" title="Write the trailer of the output file container.">write_output_file_trailer</a>(<a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *output_format_context)
<a name="l00638"></a>00638 {
<a name="l00639"></a>00639 <span class="keywordtype">int</span> error;
<a name="l00640"></a>00640 <span class="keywordflow">if</span> ((error = <a class="code" href="group__lavf__encoding.html#ga7f14007e7dc8f481f054b21614dfec13" title="Write the stream trailer to an output media file and free the file private data.">av_write_trailer</a>(output_format_context)) < 0) {
<a name="l00641"></a>00641 fprintf(stderr, <span class="stringliteral">"Could not write output file trailer (error '%s')\n"</span>,
<a name="l00642"></a>00642 <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a name="l00643"></a>00643 <span class="keywordflow">return</span> error;
<a name="l00644"></a>00644 }
<a name="l00645"></a>00645 <span class="keywordflow">return</span> 0;
<a name="l00646"></a>00646 }
<a name="l00647"></a>00647 <span class="comment"></span>
<a name="l00648"></a>00648 <span class="comment">/** Convert an audio file to an AAC file in an MP4 container. */</span>
<a name="l00649"></a><a class="code" href="transcode__aac_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">00649</a> <span class="keywordtype">int</span> <a class="code" href="avio__list__dir_8c.html#a0ddf1224851353fc92bfbff6f499fa97">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
<a name="l00650"></a>00650 {
<a name="l00651"></a>00651 <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *input_format_context = NULL, *output_format_context = NULL;
<a name="l00652"></a>00652 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context = NULL, *output_codec_context = NULL;
<a name="l00653"></a>00653 <a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> *resample_context = NULL;
<a name="l00654"></a>00654 <a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f" title="Context for an Audio FIFO Buffer.">AVAudioFifo</a> *fifo = NULL;
<a name="l00655"></a>00655 <span class="keywordtype">int</span> ret = <a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
<a name="l00656"></a>00656
<a name="l00657"></a>00657 <span class="keywordflow">if</span> (argc < 3) {
<a name="l00658"></a>00658 fprintf(stderr, <span class="stringliteral">"Usage: %s <input file> <output file>\n"</span>, argv[0]);
<a name="l00659"></a>00659 exit(1);
<a name="l00660"></a>00660 }
<a name="l00661"></a>00661 <span class="comment"></span>
<a name="l00662"></a>00662 <span class="comment"> /** Register all codecs and formats so that they can be used. */</span>
<a name="l00663"></a>00663 <a class="code" href="group__lavf__core.html#ga917265caec45ef5a0646356ed1a507e3" title="Initialize libavformat and register all the muxers, demuxers and protocols.">av_register_all</a>();<span class="comment"></span>
<a name="l00664"></a>00664 <span class="comment"> /** Open the input file for reading. */</span>
<a name="l00665"></a>00665 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a8103e36bb4cb4141ee5e25acc350bc0b" title="Open an input file and the required decoder.">open_input_file</a>(argv[1], &input_format_context,
<a name="l00666"></a>00666 &input_codec_context))
<a name="l00667"></a>00667 <span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<a name="l00668"></a>00668 <span class="comment"> /** Open the output file for writing. */</span>
<a name="l00669"></a>00669 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a617f4760254c119fc7caa222f3fcbd21" title="Open an output file and the required encoder.">open_output_file</a>(argv[2], input_codec_context,
<a name="l00670"></a>00670 &output_format_context, &output_codec_context))
<a name="l00671"></a>00671 <span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<a name="l00672"></a>00672 <span class="comment"> /** Initialize the resampler to be able to convert audio sample formats. */</span>
<a name="l00673"></a>00673 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a68b32c4f40838cc56a7f45d33286d039" title="Initialize the audio resampler based on the input and output codec settings.">init_resampler</a>(input_codec_context, output_codec_context,
<a name="l00674"></a>00674 &resample_context))
<a name="l00675"></a>00675 <span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<a name="l00676"></a>00676 <span class="comment"> /** Initialize the FIFO buffer to store audio samples to be encoded. */</span>
<a name="l00677"></a>00677 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a96cd24fde0bde66e80f3141a1def94c6" title="Initialize a FIFO buffer for the audio samples to be encoded.">init_fifo</a>(&fifo, output_codec_context))
<a name="l00678"></a>00678 <span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<a name="l00679"></a>00679 <span class="comment"> /** Write the header of the output file container. */</span>
<a name="l00680"></a>00680 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a717f7868fc24543151cb94b307e87420" title="Write the header of the output file container.">write_output_file_header</a>(output_format_context))
<a name="l00681"></a>00681 <span class="keywordflow">goto</span> cleanup;
<a name="l00682"></a>00682 <span class="comment"></span>
<a name="l00683"></a>00683 <span class="comment"> /**</span>
<a name="l00684"></a>00684 <span class="comment"> * Loop as long as we have input samples to read or output samples</span>
<a name="l00685"></a>00685 <span class="comment"> * to write; abort as soon as we have neither.</span>
<a name="l00686"></a>00686 <span class="comment"> */</span>
<a name="l00687"></a>00687 <span class="keywordflow">while</span> (1) {<span class="comment"></span>
<a name="l00688"></a>00688 <span class="comment"> /** Use the encoder's desired frame size for processing. */</span>
<a name="l00689"></a>00689 <span class="keyword">const</span> <span class="keywordtype">int</span> output_frame_size = output_codec_context->frame_size;
<a name="l00690"></a>00690 <span class="keywordtype">int</span> finished = 0;
<a name="l00691"></a>00691 <span class="comment"></span>
<a name="l00692"></a>00692 <span class="comment"> /**</span>
<a name="l00693"></a>00693 <span class="comment"> * Make sure that there is one frame worth of samples in the FIFO</span>
<a name="l00694"></a>00694 <span class="comment"> * buffer so that the encoder can do its work.</span>
<a name="l00695"></a>00695 <span class="comment"> * Since the decoder's and the encoder's frame size may differ, we</span>
<a name="l00696"></a>00696 <span class="comment"> * need to FIFO buffer to store as many frames worth of input samples</span>
<a name="l00697"></a>00697 <span class="comment"> * that they make up at least one frame worth of output samples.</span>
<a name="l00698"></a>00698 <span class="comment"> */</span>
<a name="l00699"></a>00699 <span class="keywordflow">while</span> (<a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b" title="Get the current number of samples in the AVAudioFifo available for reading.">av_audio_fifo_size</a>(fifo) < output_frame_size) {<span class="comment"></span>
<a name="l00700"></a>00700 <span class="comment"> /**</span>
<a name="l00701"></a>00701 <span class="comment"> * Decode one frame worth of audio samples, convert it to the</span>
<a name="l00702"></a>00702 <span class="comment"> * output sample format and put it into the FIFO buffer.</span>
<a name="l00703"></a>00703 <span class="comment"> */</span>
<a name="l00704"></a>00704 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a7f6cf47c64ae78cbdad6115e57aa2c2f" title="Read one audio frame from the input file, decodes, converts and stores it in the FIFO buffer...">read_decode_convert_and_store</a>(fifo, input_format_context,
<a name="l00705"></a>00705 input_codec_context,
<a name="l00706"></a>00706 output_codec_context,
<a name="l00707"></a>00707 resample_context, &finished))
<a name="l00708"></a>00708 <span class="keywordflow">goto</span> cleanup;
<a name="l00709"></a>00709 <span class="comment"></span>
<a name="l00710"></a>00710 <span class="comment"> /**</span>
<a name="l00711"></a>00711 <span class="comment"> * If we are at the end of the input file, we continue</span>
<a name="l00712"></a>00712 <span class="comment"> * encoding the remaining audio samples to the output file.</span>
<a name="l00713"></a>00713 <span class="comment"> */</span>
<a name="l00714"></a>00714 <span class="keywordflow">if</span> (finished)
<a name="l00715"></a>00715 <span class="keywordflow">break</span>;
<a name="l00716"></a>00716 }
<a name="l00717"></a>00717 <span class="comment"></span>
<a name="l00718"></a>00718 <span class="comment"> /**</span>
<a name="l00719"></a>00719 <span class="comment"> * If we have enough samples for the encoder, we encode them.</span>
<a name="l00720"></a>00720 <span class="comment"> * At the end of the file, we pass the remaining samples to</span>
<a name="l00721"></a>00721 <span class="comment"> * the encoder.</span>
<a name="l00722"></a>00722 <span class="comment"> */</span>
<a name="l00723"></a>00723 <span class="keywordflow">while</span> (<a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b" title="Get the current number of samples in the AVAudioFifo available for reading.">av_audio_fifo_size</a>(fifo) >= output_frame_size ||
<a name="l00724"></a>00724 (finished && <a class="code" href="group__lavu__audiofifo.html#gaa0a4742ecac52a999e8b4478d27f3b9b" title="Get the current number of samples in the AVAudioFifo available for reading.">av_audio_fifo_size</a>(fifo) > 0))<span class="comment"></span>
<a name="l00725"></a>00725 <span class="comment"> /**</span>
<a name="l00726"></a>00726 <span class="comment"> * Take one frame worth of audio samples from the FIFO buffer,</span>
<a name="l00727"></a>00727 <span class="comment"> * encode it and write it to the output file.</span>
<a name="l00728"></a>00728 <span class="comment"> */</span>
<a name="l00729"></a>00729 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#ab4367e0049c0bbd56eec8c525cdbd6e5" title="Load one audio frame from the FIFO buffer, encode and write it to the output file.">load_encode_and_write</a>(fifo, output_format_context,
<a name="l00730"></a>00730 output_codec_context))
<a name="l00731"></a>00731 <span class="keywordflow">goto</span> cleanup;
<a name="l00732"></a>00732 <span class="comment"></span>
<a name="l00733"></a>00733 <span class="comment"> /**</span>
<a name="l00734"></a>00734 <span class="comment"> * If we are at the end of the input file and have encoded</span>
<a name="l00735"></a>00735 <span class="comment"> * all remaining samples, we can exit this loop and finish.</span>
<a name="l00736"></a>00736 <span class="comment"> */</span>
<a name="l00737"></a>00737 <span class="keywordflow">if</span> (finished) {
<a name="l00738"></a>00738 <span class="keywordtype">int</span> data_written;<span class="comment"></span>
<a name="l00739"></a>00739 <span class="comment"> /** Flush the encoder as it may have delayed frames. */</span>
<a name="l00740"></a>00740 <span class="keywordflow">do</span> {
<a name="l00741"></a>00741 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#a3d408f21612691f8c93a7aa24ea554ef" title="Encode one frame worth of audio to the output file.">encode_audio_frame</a>(NULL, output_format_context,
<a name="l00742"></a>00742 output_codec_context, &data_written))
<a name="l00743"></a>00743 <span class="keywordflow">goto</span> cleanup;
<a name="l00744"></a>00744 } <span class="keywordflow">while</span> (data_written);
<a name="l00745"></a>00745 <span class="keywordflow">break</span>;
<a name="l00746"></a>00746 }
<a name="l00747"></a>00747 }
<a name="l00748"></a>00748 <span class="comment"></span>
<a name="l00749"></a>00749 <span class="comment"> /** Write the trailer of the output file container. */</span>
<a name="l00750"></a>00750 <span class="keywordflow">if</span> (<a class="code" href="transcode__aac_8c.html#aea497107d8d2a7a1e5bf92422ccc6715" title="Write the trailer of the output file container.">write_output_file_trailer</a>(output_format_context))
<a name="l00751"></a>00751 <span class="keywordflow">goto</span> cleanup;
<a name="l00752"></a>00752 ret = 0;
<a name="l00753"></a>00753
<a name="l00754"></a>00754 cleanup:
<a name="l00755"></a>00755 <span class="keywordflow">if</span> (fifo)
<a name="l00756"></a>00756 <a class="code" href="group__lavu__audiofifo.html#ga74e029e47f7aa99217ad1f315c434875" title="Free an AVAudioFifo.">av_audio_fifo_free</a>(fifo);
<a name="l00757"></a>00757 <a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34" title="Free the given SwrContext and set the pointer to NULL.">swr_free</a>(&resample_context);
<a name="l00758"></a>00758 <span class="keywordflow">if</span> (output_codec_context)
<a name="l00759"></a>00759 <a class="code" 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>(output_codec_context);
<a name="l00760"></a>00760 <span class="keywordflow">if</span> (output_format_context) {
<a name="l00761"></a>00761 <a class="code" href="avio_8h.html#ae118a1f37f1e48617609ead9910aac15" title="Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...">avio_closep</a>(&output_format_context->pb);
<a name="l00762"></a>00762 <a class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445" title="Free an AVFormatContext and all its streams.">avformat_free_context</a>(output_format_context);
<a name="l00763"></a>00763 }
<a name="l00764"></a>00764 <span class="keywordflow">if</span> (input_codec_context)
<a name="l00765"></a>00765 <a class="code" 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>(input_codec_context);
<a name="l00766"></a>00766 <span class="keywordflow">if</span> (input_format_context)
<a name="l00767"></a>00767 <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(&input_format_context);
<a name="l00768"></a>00768
<a name="l00769"></a>00769 <span class="keywordflow">return</span> ret;
<a name="l00770"></a>00770 }
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