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<title>FFmpeg: transcode_aac.c</title>
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 <span id="projectnumber">2.7.1</span>
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<div class="title">transcode_aac.c</div> </div>
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<p>Convert an input audio file to AAC in an MP4 container using FFmpeg. </p>
<dl class="author"><dt><b>Author:</b></dt><dd>Andreas Unterweger (<a href="mailto:dustsigns@gmail.com">dustsigns@gmail.com</a>)</dd></dl>
<div class="fragment"><pre class="fragment"><span class="comment">/*</span>
<span class="comment"> * This file is part of FFmpeg.</span>
<span class="comment"> *</span>
<span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span>
<span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<span class="comment"> * License as published by the Free Software Foundation; either</span>
<span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span>
<span class="comment"> *</span>
<span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span>
<span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<span class="comment"> * Lesser General Public License for more details.</span>
<span class="comment"> *</span>
<span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
<span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span>
<span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span>
<span class="comment"> */</span>
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * @file</span>
<span class="comment"> * simple audio converter</span>
<span class="comment"> *</span>
<span class="comment"> * @example transcode_aac.c</span>
<span class="comment"> * Convert an input audio file to AAC in an MP4 container using FFmpeg.</span>
<span class="comment"> * @author Andreas Unterweger (dustsigns@gmail.com)</span>
<span class="comment"> */</span>
<span class="preprocessor">#include <stdio.h></span>
<span class="preprocessor">#include "<a class="code" href="avformat_8h.html" title="Main libavformat public API header.">libavformat/avformat.h</a>"</span>
<span class="preprocessor">#include "<a class="code" href="avio_8h.html" title="Buffered I/O operations.">libavformat/avio.h</a>"</span>
<span class="preprocessor">#include "<a class="code" href="libavcodec_2avcodec_8h.html" title="Libavcodec external API header.">libavcodec/avcodec.h</a>"</span>
<span class="preprocessor">#include "<a class="code" href="audio__fifo_8h.html" title="Audio FIFO Buffer.">libavutil/audio_fifo.h</a>"</span>
<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>
<span class="preprocessor">#include "<a class="code" href="avstring_8h.html">libavutil/avstring.h</a>"</span>
<span class="preprocessor">#include "<a class="code" href="frame_8h.html" title="reference-counted frame API">libavutil/frame.h</a>"</span>
<span class="preprocessor">#include "<a class="code" href="opt_8h.html" title="AVOptions.">libavutil/opt.h</a>"</span>
<span class="preprocessor">#include "<a class="code" href="swresample_8h.html" title="libswresample public header">libswresample/swresample.h</a>"</span>
<span class="comment"></span>
<span class="comment">/** The output bit rate in kbit/s */</span>
<span class="preprocessor">#define OUTPUT_BIT_RATE 96000</span>
<span class="preprocessor"></span><span class="comment">/** The number of output channels */</span>
<span class="preprocessor">#define OUTPUT_CHANNELS 2</span>
<span class="preprocessor"></span><span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Convert an error code into a text message.</span>
<span class="comment"> * @param error Error code to be converted</span>
<span class="comment"> * @return Corresponding error text (not thread-safe)</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a name="a0"></a><a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(<span class="keyword">const</span> <span class="keywordtype">int</span> error)
{
<span class="keyword">static</span> <span class="keywordtype">char</span> error_buffer[255];
<a name="a1"></a><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));
<span class="keywordflow">return</span> error_buffer;
}
<span class="comment"></span>
<span class="comment">/** Open an input file and the required decoder. */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a2"></a><a class="code" href="filtering__audio_8c.html#abd04bf1a933d4d2698482f4949c61fed">open_input_file</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *filename,
<a name="_a3"></a><a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> **input_format_context,
<a name="_a4"></a><a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> **input_codec_context)
{
<a name="_a5"></a><a class="code" href="structAVCodec.html" title="AVCodec.">AVCodec</a> *input_codec;
<span class="keywordtype">int</span> error;
<span class="comment"></span>
<span class="comment"> /** Open the input file to read from it. */</span>
<span class="keywordflow">if</span> ((error = <a name="a6"></a><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,
NULL)) < 0) {
fprintf(stderr, <span class="stringliteral">"Could not open input file '%s' (error '%s')\n"</span>,
filename, <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
*input_format_context = NULL;
<span class="keywordflow">return</span> error;
}
<span class="comment"></span>
<span class="comment"> /** Get information on the input file (number of streams etc.). */</span>
<span class="keywordflow">if</span> ((error = <a name="a7"></a><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) {
fprintf(stderr, <span class="stringliteral">"Could not open find stream info (error '%s')\n"</span>,
<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="a8"></a><a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(input_format_context);
<span class="keywordflow">return</span> error;
}
<span class="comment"></span>
<span class="comment"> /** Make sure that there is only one stream in the input file. */</span>
<span class="keywordflow">if</span> ((*input_format_context)->nb_streams != 1) {
fprintf(stderr, <span class="stringliteral">"Expected one audio input stream, but found %d\n"</span>,
(*input_format_context)->nb_streams);
<a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(input_format_context);
<span class="keywordflow">return</span> <a name="a9"></a><a class="code" href="group__lavu__error.html#ga334ea23fd9e492cd0e718330f2353b6b" title="Immediate exit was requested; the called function should not be restarted.">AVERROR_EXIT</a>;
}
<span class="comment"></span>
<span class="comment"> /** Find a decoder for the audio stream. */</span>
<span class="keywordflow">if</span> (!(input_codec = <a name="a10"></a><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))) {
fprintf(stderr, <span class="stringliteral">"Could not find input codec\n"</span>);
<a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(input_format_context);
<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>;
}
<span class="comment"></span>
<span class="comment"> /** Open the decoder for the audio stream to use it later. */</span>
<span class="keywordflow">if</span> ((error = <a name="a11"></a><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,
input_codec, NULL)) < 0) {
fprintf(stderr, <span class="stringliteral">"Could not open input codec (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(input_format_context);
<span class="keywordflow">return</span> error;
}
<span class="comment"></span>
<span class="comment"> /** Save the decoder context for easier access later. */</span>
*input_codec_context = (*input_format_context)->streams[0]-><a name="a12"></a><a class="code" href="structAVCodecContext.html#ab00398f08f8622c3e6c0f1a12eb99808">codec</a>;
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Open an output file and the required encoder.</span>
<span class="comment"> * Also set some basic encoder parameters.</span>
<span class="comment"> * Some of these parameters are based on the input file's parameters.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a13"></a><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 class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context,
<a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> **output_format_context,
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> **output_codec_context)
{
<a name="_a14"></a><a class="code" href="structAVIOContext.html" title="Bytestream IO Context.">AVIOContext</a> *output_io_context = NULL;
<a name="_a15"></a><a class="code" href="structAVStream.html" title="Stream structure.">AVStream</a> *stream = NULL;
<a class="code" href="structAVCodec.html" title="AVCodec.">AVCodec</a> *output_codec = NULL;
<span class="keywordtype">int</span> error;
<span class="comment"></span>
<span class="comment"> /** Open the output file to write to it. */</span>
<span class="keywordflow">if</span> ((error = <a name="a16"></a><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="a17"></a><a class="code" href="avio_8h.html#a5c9308f296545a8f3b7687d277a6dabc" title="write-only">AVIO_FLAG_WRITE</a>)) < 0) {
fprintf(stderr, <span class="stringliteral">"Could not open output file '%s' (error '%s')\n"</span>,
filename, <a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<span class="keywordflow">return</span> error;
}
<span class="comment"></span>
<span class="comment"> /** Create a new format context for the output container format. */</span>
<span class="keywordflow">if</span> (!(*output_format_context = <a name="a18"></a><a class="code" href="group__lavf__core.html#gac7a91abf2f59648d995894711f070f62" title="Allocate an AVFormatContext.">avformat_alloc_context</a>())) {
fprintf(stderr, <span class="stringliteral">"Could not allocate output format context\n"</span>);
<span class="keywordflow">return</span> <a name="a19"></a><a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
}
<span class="comment"></span>
<span class="comment"> /** Associate the output file (pointer) with the container format context. */</span>
(*output_format_context)->pb = output_io_context;
<span class="comment"></span>
<span class="comment"> /** Guess the desired container format based on the file extension. */</span>
<span class="keywordflow">if</span> (!((*output_format_context)->oformat = <a name="a20"></a><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,
NULL))) {
fprintf(stderr, <span class="stringliteral">"Could not find output file format\n"</span>);
<span class="keywordflow">goto</span> cleanup;
}
<a name="a21"></a><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,
<span class="keyword">sizeof</span>((*output_format_context)->filename));
<span class="comment"></span>
<span class="comment"> /** Find the encoder to be used by its name. */</span>
<span class="keywordflow">if</span> (!(output_codec = <a name="a22"></a><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))) {
fprintf(stderr, <span class="stringliteral">"Could not find an AAC encoder.\n"</span>);
<span class="keywordflow">goto</span> cleanup;
}
<span class="comment"></span>
<span class="comment"> /** Create a new audio stream in the output file container. */</span>
<span class="keywordflow">if</span> (!(stream = <a name="a23"></a><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))) {
fprintf(stderr, <span class="stringliteral">"Could not create new stream\n"</span>);
error = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<span class="keywordflow">goto</span> cleanup;
}
<span class="comment"></span>
<span class="comment"> /** Save the encoder context for easier access later. */</span>
*output_codec_context = stream-><a name="a24"></a><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Set the basic encoder parameters.</span>
<span class="comment"> * The input file's sample rate is used to avoid a sample rate conversion.</span>
<span class="comment"> */</span>
(*output_codec_context)-><a name="a25"></a><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a> = <a name="a26"></a><a class="code" href="transcode__aac_8c.html#a4d4855d9b709af9628540e41e5ebb925" title="The number of output channels.">OUTPUT_CHANNELS</a>;
(*output_codec_context)->channel_layout = <a name="a27"></a><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>);
(*output_codec_context)->sample_rate = input_codec_context-><a name="a28"></a><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>;
(*output_codec_context)->sample_fmt = output_codec-><a name="a29"></a><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];
(*output_codec_context)->bit_rate = <a name="a30"></a><a class="code" href="transcode__aac_8c.html#a40d898a8dbfccabcbbff15a29924e97f" title="The output bit rate in kbit/s.">OUTPUT_BIT_RATE</a>;
<span class="comment"></span>
<span class="comment"> /** Allow the use of the experimental AAC encoder */</span>
(*output_codec_context)->strict_std_compliance = <a name="a31"></a><a class="code" href="libavcodec_2avcodec_8h.html#a0e9f40024e3b017088ee1c16f25b3910" title="Allow nonstandardized experimental things.">FF_COMPLIANCE_EXPERIMENTAL</a>;
<span class="comment"></span>
<span class="comment"> /** Set the sample rate for the container. */</span>
stream-><a name="a32"></a><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 name="a33"></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>;
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 name="a34"></a><a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9" title="numerator">num</a> = 1;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Some container formats (like MP4) require global headers to be present</span>
<span class="comment"> * Mark the encoder so that it behaves accordingly.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> ((*output_format_context)->oformat->flags & <a name="a35"></a><a class="code" href="avformat_8h.html#ab203c7b734e9c31b7c37d34f6e2c6aef" title="Format wants global header.">AVFMT_GLOBALHEADER</a>)
(*output_codec_context)->flags |= <a name="a36"></a><a class="code" href="group__lavc__core.html#gaab6ceefd617cf265ef7ea1b87ed5933e" title="Place global headers in extradata instead of every keyframe.">CODEC_FLAG_GLOBAL_HEADER</a>;
<span class="comment"></span>
<span class="comment"> /** Open the encoder for the audio stream to use it later. */</span>
<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) {
fprintf(stderr, <span class="stringliteral">"Could not open output codec (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<span class="keywordflow">goto</span> cleanup;
}
<span class="keywordflow">return</span> 0;
cleanup:
<a name="a37"></a><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="a38"></a><a class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445" title="Free an AVFormatContext and all its streams.">avformat_free_context</a>(*output_format_context);
*output_format_context = NULL;
<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>;
}
<span class="comment"></span>
<span class="comment">/** Initialize one data packet for reading or writing. */</span>
<span class="keyword">static</span> <span class="keywordtype">void</span> <a name="a39"></a><a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990" title="Initialize one data packet for reading or writing.">init_packet</a>(<a name="_a40"></a><a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> *packet)
{
<a name="a41"></a><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>
<span class="comment"> /** Set the packet data and size so that it is recognized as being empty. */</span>
packet-><a name="a42"></a><a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL;
packet-><a name="a43"></a><a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;
}
<span class="comment"></span>
<span class="comment">/** Initialize one audio frame for reading from the input file */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a44"></a><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 name="_a45"></a><a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> **<a name="a46"></a><a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>)
{
<span class="keywordflow">if</span> (!(*frame = <a name="a47"></a><a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f" title="Allocate an AVFrame and set its fields to default values.">av_frame_alloc</a>())) {
fprintf(stderr, <span class="stringliteral">"Could not allocate input frame\n"</span>);
<span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Initialize the audio resampler based on the input and output codec settings.</span>
<span class="comment"> * If the input and output sample formats differ, a conversion is required</span>
<span class="comment"> * libswresample takes care of this, but requires initialization.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a48"></a><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 class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> **resample_context)
{
<span class="keywordtype">int</span> error;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Create a resampler context for the conversion.</span>
<span class="comment"> * Set the conversion parameters.</span>
<span class="comment"> * Default channel layouts based on the number of channels</span>
<span class="comment"> * are assumed for simplicity (they are sometimes not detected</span>
<span class="comment"> * properly by the demuxer and/or decoder).</span>
<span class="comment"> */</span>
*resample_context = <a name="a49"></a><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 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>),
output_codec_context-><a name="a50"></a><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>,
output_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>,
<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>),
input_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>,
input_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>,
0, NULL);
<span class="keywordflow">if</span> (!*resample_context) {
fprintf(stderr, <span class="stringliteral">"Could not allocate resample context\n"</span>);
<span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
}<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Perform a sanity check so that the number of converted samples is</span>
<span class="comment"> * not greater than the number of samples to be converted.</span>
<span class="comment"> * If the sample rates differ, this case has to be handled differently</span>
<span class="comment"> */</span>
<a name="a51"></a><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>);
<span class="comment"></span>
<span class="comment"> /** Open the resampler with the specified parameters. */</span>
<span class="keywordflow">if</span> ((error = <a name="a52"></a><a class="code" href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67" title="Initialize context after user parameters have been set.">swr_init</a>(*resample_context)) < 0) {
fprintf(stderr, <span class="stringliteral">"Could not open resample context\n"</span>);
<a name="a53"></a><a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34" title="Free the given SwrContext and set the pointer to NULL.">swr_free</a>(resample_context);
<span class="keywordflow">return</span> error;
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/** Initialize a FIFO buffer for the audio samples to be encoded. */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a54"></a><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)
{<span class="comment"></span>
<span class="comment"> /** Create the FIFO buffer based on the specified output sample format. */</span>
<span class="keywordflow">if</span> (!(*fifo = <a name="a55"></a><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>,
output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>, 1))) {
fprintf(stderr, <span class="stringliteral">"Could not allocate FIFO\n"</span>);
<span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/** Write the header of the output file container. */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a56"></a><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)
{
<span class="keywordtype">int</span> error;
<span class="keywordflow">if</span> ((error = <a name="a57"></a><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) {
fprintf(stderr, <span class="stringliteral">"Could not write output file header (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<span class="keywordflow">return</span> error;
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/** Decode one audio frame from the input file. */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a58"></a><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> *frame,
<a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *input_format_context,
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context,
<span class="keywordtype">int</span> *data_present, <span class="keywordtype">int</span> *finished)
{<span class="comment"></span>
<span class="comment"> /** Packet used for temporary storage. */</span>
<a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> input_packet;
<span class="keywordtype">int</span> error;
<a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990" title="Initialize one data packet for reading or writing.">init_packet</a>(&input_packet);
<span class="comment"></span>
<span class="comment"> /** Read one audio frame from the input file into a temporary packet. */</span>
<span class="keywordflow">if</span> ((error = <a name="a59"></a><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>
<span class="comment"> /** If we are at the end of the file, flush the decoder below. */</span>
<span class="keywordflow">if</span> (error == <a name="a60"></a><a class="code" href="group__lavu__error.html#gab4faa0afdf35076914824200331defff" title="End of file.">AVERROR_EOF</a>)
*finished = 1;
<span class="keywordflow">else</span> {
fprintf(stderr, <span class="stringliteral">"Could not read frame (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<span class="keywordflow">return</span> error;
}
}
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Decode the audio frame stored in the temporary packet.</span>
<span class="comment"> * The input audio stream decoder is used to do this.</span>
<span class="comment"> * If we are at the end of the file, pass an empty packet to the decoder</span>
<span class="comment"> * to flush it.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> ((error = <a name="a61"></a><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,
data_present, &input_packet)) < 0) {
fprintf(stderr, <span class="stringliteral">"Could not decode frame (error '%s')\n"</span>,
<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="a62"></a><a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&input_packet);
<span class="keywordflow">return</span> error;
}
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * If the decoder has not been flushed completely, we are not finished,</span>
<span class="comment"> * so that this function has to be called again.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> (*finished && *data_present)
*finished = 0;
<a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&input_packet);
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Initialize a temporary storage for the specified number of audio samples.</span>
<span class="comment"> * The conversion requires temporary storage due to the different format.</span>
<span class="comment"> * The number of audio samples to be allocated is specified in frame_size.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a63"></a><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 class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<span class="keywordtype">int</span> frame_size)
{
<span class="keywordtype">int</span> error;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Allocate as many pointers as there are audio channels.</span>
<span class="comment"> * Each pointer will later point to the audio samples of the corresponding</span>
<span class="comment"> * channels (although it may be NULL for interleaved formats).</span>
<span class="comment"> */</span>
<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>,
<span class="keyword">sizeof</span>(**converted_input_samples)))) {
fprintf(stderr, <span class="stringliteral">"Could not allocate converted input sample pointers\n"</span>);
<span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
}
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Allocate memory for the samples of all channels in one consecutive</span>
<span class="comment"> * block for convenience.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> ((error = <a name="a64"></a><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,
output_codec_context-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>,
frame_size,
output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>, 0)) < 0) {
fprintf(stderr,
<span class="stringliteral">"Could not allocate converted input samples (error '%s')\n"</span>,
<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="a65"></a><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]);
free(*converted_input_samples);
<span class="keywordflow">return</span> error;
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Convert the input audio samples into the output sample format.</span>
<span class="comment"> * The conversion happens on a per-frame basis, the size of which is specified</span>
<span class="comment"> * by frame_size.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a66"></a><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,
uint8_t **converted_data, <span class="keyword">const</span> <span class="keywordtype">int</span> frame_size,
<a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> *resample_context)
{
<span class="keywordtype">int</span> error;
<span class="comment"></span>
<span class="comment"> /** Convert the samples using the resampler. */</span>
<span class="keywordflow">if</span> ((error = <a name="a67"></a><a class="code" href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a" title="Convert audio.">swr_convert</a>(resample_context,
converted_data, frame_size,
input_data , frame_size)) < 0) {
fprintf(stderr, <span class="stringliteral">"Could not convert input samples (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<span class="keywordflow">return</span> error;
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/** Add converted input audio samples to the FIFO buffer for later processing. */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a68"></a><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,
uint8_t **converted_input_samples,
<span class="keyword">const</span> <span class="keywordtype">int</span> frame_size)
{
<span class="keywordtype">int</span> error;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Make the FIFO as large as it needs to be to hold both,</span>
<span class="comment"> * the old and the new samples.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> ((error = <a name="a69"></a><a class="code" href="group__lavu__audiofifo.html#gae34e4eb0928f8e4539730d8c044c6139" title="Reallocate an AVAudioFifo.">av_audio_fifo_realloc</a>(fifo, <a name="a70"></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) + frame_size)) < 0) {
fprintf(stderr, <span class="stringliteral">"Could not reallocate FIFO\n"</span>);
<span class="keywordflow">return</span> error;
}
<span class="comment"></span>
<span class="comment"> /** Store the new samples in the FIFO buffer. */</span>
<span class="keywordflow">if</span> (<a name="a71"></a><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,
frame_size) < frame_size) {
fprintf(stderr, <span class="stringliteral">"Could not write data to FIFO\n"</span>);
<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>;
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Read one audio frame from the input file, decodes, converts and stores</span>
<span class="comment"> * it in the FIFO buffer.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a72"></a><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 class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *input_format_context,
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context,
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> *resampler_context,
<span class="keywordtype">int</span> *finished)
{<span class="comment"></span>
<span class="comment"> /** Temporary storage of the input samples of the frame read from the file. */</span>
<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>
<span class="comment"> /** Temporary storage for the converted input samples. */</span>
uint8_t **converted_input_samples = NULL;
<span class="keywordtype">int</span> data_present;
<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>;
<span class="comment"></span>
<span class="comment"> /** Initialize temporary storage for one input frame. */</span>
<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))
<span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<span class="comment"> /** Decode one frame worth of audio samples. */</span>
<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,
input_codec_context, &data_present, finished))
<span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * If we are at the end of the file and there are no more samples</span>
<span class="comment"> * in the decoder which are delayed, we are actually finished.</span>
<span class="comment"> * This must not be treated as an error.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> (*finished && !data_present) {
ret = 0;
<span class="keywordflow">goto</span> cleanup;
}<span class="comment"></span>
<span class="comment"> /** If there is decoded data, convert and store it */</span>
<span class="keywordflow">if</span> (data_present) {<span class="comment"></span>
<span class="comment"> /** Initialize the temporary storage for the converted input samples. */</span>
<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,
input_frame-><a name="a73"></a><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a>))
<span class="keywordflow">goto</span> cleanup;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Convert the input samples to the desired output sample format.</span>
<span class="comment"> * This requires a temporary storage provided by converted_input_samples.</span>
<span class="comment"> */</span>
<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 name="a74"></a><a class="code" href="structAVFrame.html#afca04d808393822625e09b5ba91c6756" title="pointers to the data planes/channels.">extended_data</a>, converted_input_samples,
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))
<span class="keywordflow">goto</span> cleanup;
<span class="comment"></span>
<span class="comment"> /** Add the converted input samples to the FIFO buffer for later processing. */</span>
<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,
input_frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a>))
<span class="keywordflow">goto</span> cleanup;
ret = 0;
}
ret = 0;
cleanup:
<span class="keywordflow">if</span> (converted_input_samples) {
<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]);
free(converted_input_samples);
}
<a name="a75"></a><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);
<span class="keywordflow">return</span> ret;
}
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Initialize one input frame for writing to the output file.</span>
<span class="comment"> * The frame will be exactly frame_size samples large.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a76"></a><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> **frame,
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<span class="keywordtype">int</span> frame_size)
{
<span class="keywordtype">int</span> error;
<span class="comment"></span>
<span class="comment"> /** Create a new frame to store the audio samples. */</span>
<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>())) {
fprintf(stderr, <span class="stringliteral">"Could not allocate output frame\n"</span>);
<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>;
}
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Set the frame's parameters, especially its size and format.</span>
<span class="comment"> * av_frame_get_buffer needs this to allocate memory for the</span>
<span class="comment"> * audio samples of the frame.</span>
<span class="comment"> * Default channel layouts based on the number of channels</span>
<span class="comment"> * are assumed for simplicity.</span>
<span class="comment"> */</span>
(*frame)->nb_samples = frame_size;
(*frame)->channel_layout = output_codec_context-><a name="a77"></a><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a>;
(*frame)->format = output_codec_context-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>;
(*frame)->sample_rate = output_codec_context-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Allocate the samples of the created frame. This call will make</span>
<span class="comment"> * sure that the audio frame can hold as many samples as specified.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> ((error = <a name="a78"></a><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) {
fprintf(stderr, <span class="stringliteral">"Could allocate output frame samples (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<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);
<span class="keywordflow">return</span> error;
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/** Global timestamp for the audio frames */</span>
<span class="keyword">static</span> int64_t <a name="a79"></a><a class="code" href="transcode__aac_8c.html#a4fbb704fb96c36a78a36eee010306ce7" title="Global timestamp for the audio frames.">pts</a> = 0;
<span class="comment"></span>
<span class="comment">/** Encode one frame worth of audio to the output file. */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a80"></a><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> *frame,
<a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *output_format_context,
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context,
<span class="keywordtype">int</span> *data_present)
{<span class="comment"></span>
<span class="comment"> /** Packet used for temporary storage. */</span>
<a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> output_packet;
<span class="keywordtype">int</span> error;
<a class="code" href="transcode__aac_8c.html#a0b457785184f97c7169f9c1c05736990" title="Initialize one data packet for reading or writing.">init_packet</a>(&output_packet);
<span class="comment"></span>
<span class="comment"> /** Set a timestamp based on the sample rate for the container. */</span>
<span class="keywordflow">if</span> (frame) {
frame-><a name="a81"></a><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>;
pts += frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a>;
}
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Encode the audio frame and store it in the temporary packet.</span>
<span class="comment"> * The output audio stream encoder is used to do this.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> ((error = <a name="a82"></a><a class="code" href="group__lavc__encoding.html#ga93a49fbd0973b216dcb8a8c5dffe1d82" title="Encode a frame of audio.">avcodec_encode_audio2</a>(output_codec_context, &output_packet,
frame, data_present)) < 0) {
fprintf(stderr, <span class="stringliteral">"Could not encode frame (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&output_packet);
<span class="keywordflow">return</span> error;
}
<span class="comment"></span>
<span class="comment"> /** Write one audio frame from the temporary packet to the output file. */</span>
<span class="keywordflow">if</span> (*data_present) {
<span class="keywordflow">if</span> ((error = <a name="a83"></a><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) {
fprintf(stderr, <span class="stringliteral">"Could not write frame (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&output_packet);
<span class="keywordflow">return</span> error;
}
<a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&output_packet);
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Load one audio frame from the FIFO buffer, encode and write it to the</span>
<span class="comment"> * output file.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a84"></a><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 class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *output_format_context,
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *output_codec_context)
{<span class="comment"></span>
<span class="comment"> /** Temporary storage of the output samples of the frame written to the file. */</span>
<a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> *output_frame;<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Use the maximum number of possible samples per frame.</span>
<span class="comment"> * If there is less than the maximum possible frame size in the FIFO</span>
<span class="comment"> * buffer use this number. Otherwise, use the maximum possible frame size</span>
<span class="comment"> */</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> frame_size = <a name="a85"></a><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),
output_codec_context-><a name="a86"></a><a class="code" href="structAVCodecContext.html#aec57f0d859a6df8b479cd93ca3a44a33" title="Number of samples per channel in an audio frame.">frame_size</a>);
<span class="keywordtype">int</span> data_written;
<span class="comment"></span>
<span class="comment"> /** Initialize temporary storage for one output frame. */</span>
<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))
<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>;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Read as many samples from the FIFO buffer as required to fill the frame.</span>
<span class="comment"> * The samples are stored in the frame temporarily.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> (<a name="a87"></a><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 name="a88"></a><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992" title="pointer to the picture/channel planes.">data</a>, frame_size) < frame_size) {
fprintf(stderr, <span class="stringliteral">"Could not read data from FIFO\n"</span>);
<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);
<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>;
}
<span class="comment"></span>
<span class="comment"> /** Encode one frame worth of audio samples. */</span>
<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,
output_codec_context, &data_written)) {
<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);
<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 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);
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/** Write the trailer of the output file container. */</span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a89"></a><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)
{
<span class="keywordtype">int</span> error;
<span class="keywordflow">if</span> ((error = <a name="a90"></a><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) {
fprintf(stderr, <span class="stringliteral">"Could not write output file trailer (error '%s')\n"</span>,
<a class="code" href="transcode__aac_8c.html#adc7cf4c70d2850aecf8c9997a350147c" title="Convert an error code into a text message.">get_error_text</a>(error));
<span class="keywordflow">return</span> error;
}
<span class="keywordflow">return</span> 0;
}
<span class="comment"></span>
<span class="comment">/** Convert an audio file to an AAC file in an MP4 container. */</span>
<span class="keywordtype">int</span> <a name="a91"></a><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 class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *input_format_context = NULL, *output_format_context = NULL;
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *input_codec_context = NULL, *output_codec_context = NULL;
<a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> *resample_context = NULL;
<a class="code" href="group__lavu__audiofifo.html#ga328abb21e9abb2c455d2d9c212d5230f" title="Context for an Audio FIFO Buffer.">AVAudioFifo</a> *fifo = NULL;
<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>;
<span class="keywordflow">if</span> (argc < 3) {
fprintf(stderr, <span class="stringliteral">"Usage: %s <input file> <output file>\n"</span>, argv[0]);
exit(1);
}
<span class="comment"></span>
<span class="comment"> /** Register all codecs and formats so that they can be used. */</span>
<a name="a92"></a><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>
<span class="comment"> /** Open the input file for reading. */</span>
<span class="keywordflow">if</span> (<a class="code" href="filtering__audio_8c.html#abd04bf1a933d4d2698482f4949c61fed">open_input_file</a>(argv[1], &input_format_context,
&input_codec_context))
<span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<span class="comment"> /** Open the output file for writing. */</span>
<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,
&output_format_context, &output_codec_context))
<span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<span class="comment"> /** Initialize the resampler to be able to convert audio sample formats. */</span>
<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,
&resample_context))
<span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<span class="comment"> /** Initialize the FIFO buffer to store audio samples to be encoded. */</span>
<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))
<span class="keywordflow">goto</span> cleanup;<span class="comment"></span>
<span class="comment"> /** Write the header of the output file container. */</span>
<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))
<span class="keywordflow">goto</span> cleanup;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Loop as long as we have input samples to read or output samples</span>
<span class="comment"> * to write; abort as soon as we have neither.</span>
<span class="comment"> */</span>
<span class="keywordflow">while</span> (1) {<span class="comment"></span>
<span class="comment"> /** Use the encoder's desired frame size for processing. */</span>
<span class="keyword">const</span> <span class="keywordtype">int</span> output_frame_size = output_codec_context->frame_size;
<span class="keywordtype">int</span> finished = 0;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * Make sure that there is one frame worth of samples in the FIFO</span>
<span class="comment"> * buffer so that the encoder can do its work.</span>
<span class="comment"> * Since the decoder's and the encoder's frame size may differ, we</span>
<span class="comment"> * need to FIFO buffer to store as many frames worth of input samples</span>
<span class="comment"> * that they make up at least one frame worth of output samples.</span>
<span class="comment"> */</span>
<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>
<span class="comment"> /**</span>
<span class="comment"> * Decode one frame worth of audio samples, convert it to the</span>
<span class="comment"> * output sample format and put it into the FIFO buffer.</span>
<span class="comment"> */</span>
<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,
input_codec_context,
output_codec_context,
resample_context, &finished))
<span class="keywordflow">goto</span> cleanup;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * If we are at the end of the input file, we continue</span>
<span class="comment"> * encoding the remaining audio samples to the output file.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> (finished)
<span class="keywordflow">break</span>;
}
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * If we have enough samples for the encoder, we encode them.</span>
<span class="comment"> * At the end of the file, we pass the remaining samples to</span>
<span class="comment"> * the encoder.</span>
<span class="comment"> */</span>
<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 ||
(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>
<span class="comment"> /**</span>
<span class="comment"> * Take one frame worth of audio samples from the FIFO buffer,</span>
<span class="comment"> * encode it and write it to the output file.</span>
<span class="comment"> */</span>
<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,
output_codec_context))
<span class="keywordflow">goto</span> cleanup;
<span class="comment"></span>
<span class="comment"> /**</span>
<span class="comment"> * If we are at the end of the input file and have encoded</span>
<span class="comment"> * all remaining samples, we can exit this loop and finish.</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> (finished) {
<span class="keywordtype">int</span> data_written;<span class="comment"></span>
<span class="comment"> /** Flush the encoder as it may have delayed frames. */</span>
<span class="keywordflow">do</span> {
<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,
output_codec_context, &data_written))
<span class="keywordflow">goto</span> cleanup;
} <span class="keywordflow">while</span> (data_written);
<span class="keywordflow">break</span>;
}
}
<span class="comment"></span>
<span class="comment"> /** Write the trailer of the output file container. */</span>
<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))
<span class="keywordflow">goto</span> cleanup;
ret = 0;
cleanup:
<span class="keywordflow">if</span> (fifo)
<a name="a93"></a><a class="code" href="group__lavu__audiofifo.html#ga74e029e47f7aa99217ad1f315c434875" title="Free an AVAudioFifo.">av_audio_fifo_free</a>(fifo);
<a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34" title="Free the given SwrContext and set the pointer to NULL.">swr_free</a>(&resample_context);
<span class="keywordflow">if</span> (output_codec_context)
<a name="a94"></a><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);
<span class="keywordflow">if</span> (output_format_context) {
<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 class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445" title="Free an AVFormatContext and all its streams.">avformat_free_context</a>(output_format_context);
}
<span class="keywordflow">if</span> (input_codec_context)
<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);
<span class="keywordflow">if</span> (input_format_context)
<a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(&input_format_context);
<span class="keywordflow">return</span> ret;
}
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