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 <span id="projectnumber">2.7.1</span>
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<div class="title">transcoding.c</div> </div>
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<div class="fragment"><pre class="fragment"><span class="comment">/*</span>
<span class="comment"> * Copyright (c) 2010 Nicolas George</span>
<span class="comment"> * Copyright (c) 2011 Stefano Sabatini</span>
<span class="comment"> * Copyright (c) 2014 Andrey Utkin</span>
<span class="comment"> *</span>
<span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span>
<span class="comment"> * of this software and associated documentation files (the "Software"), to deal</span>
<span class="comment"> * in the Software without restriction, including without limitation the rights</span>
<span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
<span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span>
<span class="comment"> * furnished to do so, subject to the following conditions:</span>
<span class="comment"> *</span>
<span class="comment"> * The above copyright notice and this permission notice shall be included in</span>
<span class="comment"> * all copies or substantial portions of the Software.</span>
<span class="comment"> *</span>
<span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
<span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
<span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span>
<span class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
<span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
<span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span>
<span class="comment"> * THE SOFTWARE.</span>
<span class="comment"> */</span>
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * @file</span>
<span class="comment"> * API example for demuxing, decoding, filtering, encoding and muxing</span>
<span class="comment"> * @example transcoding.c</span>
<span class="comment"> */</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="avformat_8h.html" title="Main libavformat public API header.">libavformat/avformat.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="avfiltergraph_8h.html">libavfilter/avfiltergraph.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="libavfilter_2avcodec_8h.html" title="libavcodec/libavfilter gluing utilities">libavfilter/avcodec.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="buffersink_8h.html" title="memory buffer sink API for audio and video">libavfilter/buffersink.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="buffersrc_8h.html" title="Memory buffer source API.">libavfilter/buffersrc.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="pixdesc_8h.html">libavutil/pixdesc.h</a>></span>
<span class="keyword">static</span> <a name="_a0"></a><a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *<a name="a1"></a><a class="code" href="transcoding_8c.html#a24170971d926c1359c289f2515dec3d7">ifmt_ctx</a>;
<span class="keyword">static</span> <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *<a name="a2"></a><a class="code" href="transcoding_8c.html#aad50129a22f90b00b5d5cc7551175093">ofmt_ctx</a>;
<span class="keyword">typedef</span> <span class="keyword">struct </span><a name="_a3"></a><a class="code" href="structFilteringContext.html">FilteringContext</a> {
<a name="_a4"></a><a class="code" href="structAVFilterContext.html" title="An instance of a filter.">AVFilterContext</a> *<a name="a5"></a><a class="code" href="structFilteringContext.html#a4476c9e6fb492172c909ae4a47c47233">buffersink_ctx</a>;
<a class="code" href="structAVFilterContext.html" title="An instance of a filter.">AVFilterContext</a> *<a name="a6"></a><a class="code" href="structFilteringContext.html#a25c500d3728df3a9f904e6d86cf55f11">buffersrc_ctx</a>;
<a name="_a7"></a><a class="code" href="structAVFilterGraph.html">AVFilterGraph</a> *<a name="a8"></a><a class="code" href="structFilteringContext.html#aaf35e44d4e6100095b1db444e2d316cd">filter_graph</a>;
} <a class="code" href="structFilteringContext.html">FilteringContext</a>;
<span class="keyword">static</span> <a class="code" href="structFilteringContext.html">FilteringContext</a> *<a name="a9"></a><a class="code" href="transcoding_8c.html#aac21c1c8f68cdafd001a6a13dc4d7fb7">filter_ctx</a>;
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a10"></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)
{
<span class="keywordtype">int</span> ret;
<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
ifmt_ctx = NULL;
<span class="keywordflow">if</span> ((ret = <a name="a11"></a><a class="code" href="group__lavf__decoding.html#ga10a404346c646e4ab58f4ed798baca32" title="Open an input stream and read the header.">avformat_open_input</a>(&ifmt_ctx, filename, NULL, NULL)) < 0) {
<a name="a12"></a><a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a name="a13"></a><a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot open input file\n"</span>);
<span class="keywordflow">return</span> ret;
}
<span class="keywordflow">if</span> ((ret = <a name="a14"></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>(ifmt_ctx, NULL)) < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot find stream information\n"</span>);
<span class="keywordflow">return</span> ret;
}
<span class="keywordflow">for</span> (i = 0; i < ifmt_ctx-><a name="a15"></a><a class="code" href="structAVFormatContext.html#a0b748d924898b08b89ff4974afd17285" title="Number of elements in AVFormatContext.streams.">nb_streams</a>; i++) {
<a name="_a16"></a><a class="code" href="structAVStream.html" title="Stream structure.">AVStream</a> *stream;
<a name="_a17"></a><a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *codec_ctx;
stream = ifmt_ctx-><a name="a18"></a><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i];
codec_ctx = stream-><a name="a19"></a><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>;
<span class="comment">/* Reencode video & audio and remux subtitles etc. */</span>
<span class="keywordflow">if</span> (codec_ctx-><a name="a20"></a><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a name="a21"></a><a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>
|| codec_ctx-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a name="a22"></a><a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48a7b4e33b8f30ac94d34ce8d9f7c33927a">AVMEDIA_TYPE_AUDIO</a>) {
<span class="comment">/* Open decoder */</span>
ret = <a name="a23"></a><a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d" title="Initialize the AVCodecContext to use the given AVCodec.">avcodec_open2</a>(codec_ctx,
<a name="a24"></a><a class="code" href="group__lavc__decoding.html#ga19a0ca553277f019dd5b0fec6e1f9dca" title="Find a registered decoder with a matching codec ID.">avcodec_find_decoder</a>(codec_ctx-><a name="a25"></a><a class="code" href="structAVCodecContext.html#adc5f65d6099fd8339c1580c091777223">codec_id</a>), NULL);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Failed to open decoder for stream #%u\n"</span>, i);
<span class="keywordflow">return</span> ret;
}
}
}
<a name="a26"></a><a class="code" href="group__lavf__misc.html#gae2645941f2dc779c307eb6314fd39f10" title="Print detailed information about the input or output format, such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base.">av_dump_format</a>(ifmt_ctx, 0, filename, 0);
<span class="keywordflow">return</span> 0;
}
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a27"></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="structAVStream.html" title="Stream structure.">AVStream</a> *out_stream;
<a class="code" href="structAVStream.html" title="Stream structure.">AVStream</a> *in_stream;
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *<a name="a28"></a><a class="code" href="filtering__audio_8c.html#ac2bf6798f37e95d3d2ff2d44e4ab3c12">dec_ctx</a>, *enc_ctx;
<a name="_a29"></a><a class="code" href="structAVCodec.html" title="AVCodec.">AVCodec</a> *encoder;
<span class="keywordtype">int</span> ret;
<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
ofmt_ctx = NULL;
<a name="a30"></a><a class="code" href="avformat_8h.html#a6ddf3d982feb45fa5081420ee911f5d5" title="Allocate an AVFormatContext for an output format.">avformat_alloc_output_context2</a>(&ofmt_ctx, NULL, NULL, filename);
<span class="keywordflow">if</span> (!ofmt_ctx) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Could not create output context\n"</span>);
<span class="keywordflow">return</span> <a name="a31"></a><a class="code" href="group__lavu__error.html#ga4ebaa288c7684a26a591c501208910e4" title="Unknown error, typically from an external library.">AVERROR_UNKNOWN</a>;
}
<span class="keywordflow">for</span> (i = 0; i < ifmt_ctx-><a class="code" href="structAVFormatContext.html#a0b748d924898b08b89ff4974afd17285" title="Number of elements in AVFormatContext.streams.">nb_streams</a>; i++) {
out_stream = <a name="a32"></a><a class="code" href="group__lavf__core.html#gadcb0fd3e507d9b58fe78f61f8ad39827" title="Add a new stream to a media file.">avformat_new_stream</a>(ofmt_ctx, NULL);
<span class="keywordflow">if</span> (!out_stream) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Failed allocating output stream\n"</span>);
<span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#ga4ebaa288c7684a26a591c501208910e4" title="Unknown error, typically from an external library.">AVERROR_UNKNOWN</a>;
}
in_stream = ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i];
dec_ctx = in_stream-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>;
enc_ctx = out_stream-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>;
<span class="keywordflow">if</span> (dec_ctx-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>
|| dec_ctx-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48a7b4e33b8f30ac94d34ce8d9f7c33927a">AVMEDIA_TYPE_AUDIO</a>) {
<span class="comment">/* in this example, we choose transcoding to same codec */</span>
encoder = <a name="a33"></a><a class="code" href="group__lavc__encoding.html#ga9f820c481615c3a02d0407bac0bdbf25" title="Find a registered encoder with a matching codec ID.">avcodec_find_encoder</a>(dec_ctx-><a class="code" href="structAVCodecContext.html#adc5f65d6099fd8339c1580c091777223">codec_id</a>);
<span class="keywordflow">if</span> (!encoder) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a name="a34"></a><a class="code" href="group__lavu__log__constants.html#ga96970a2980bf6ad28cd403e7dc52d6c5" title="Something went wrong and recovery is not possible.">AV_LOG_FATAL</a>, <span class="stringliteral">"Necessary encoder not found\n"</span>);
<span class="keywordflow">return</span> <a name="a35"></a><a class="code" href="group__lavu__error.html#gaa6e5781e75b15ce44b0baea170c98a45" title="Invalid data found when processing input.">AVERROR_INVALIDDATA</a>;
}
<span class="comment">/* In this example, we transcode to same properties (picture size,</span>
<span class="comment"> * sample rate etc.). These properties can be changed for output</span>
<span class="comment"> * streams easily using filters */</span>
<span class="keywordflow">if</span> (dec_ctx-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>) {
enc_ctx-><a name="a36"></a><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a> = dec_ctx-><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a>;
enc_ctx-><a name="a37"></a><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956" title="picture width / height.">width</a> = dec_ctx-><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956" title="picture width / height.">width</a>;
enc_ctx-><a name="a38"></a><a class="code" href="structAVCodecContext.html#a5252d34fbce300228d4dbda19a8c3293" title="sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...">sample_aspect_ratio</a> = dec_ctx-><a class="code" href="structAVCodecContext.html#a5252d34fbce300228d4dbda19a8c3293" title="sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...">sample_aspect_ratio</a>;
<span class="comment">/* take first format from list of supported formats */</span>
enc_ctx-><a name="a39"></a><a class="code" href="structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2" title="Pixel format, see AV_PIX_FMT_xxx.">pix_fmt</a> = encoder-><a name="a40"></a><a class="code" href="structAVCodec.html#ac2b97bd3c19686025e1b7d577329c250" title="array of supported pixel formats, or NULL if unknown, array is terminated by -1">pix_fmts</a>[0];
<span class="comment">/* video time_base can be set to whatever is handy and supported by encoder */</span>
enc_ctx-><a name="a41"></a><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a> = dec_ctx-><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a>;
} <span class="keywordflow">else</span> {
enc_ctx-><a name="a42"></a><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a> = dec_ctx-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>;
enc_ctx-><a name="a43"></a><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a> = dec_ctx-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a>;
enc_ctx-><a name="a44"></a><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a> = <a name="a45"></a><a class="code" href="group__channel__mask__c.html#gac95619abeb32e4a3daa18e3ff3419380" title="Return the number of channels in the channel layout.">av_get_channel_layout_nb_channels</a>(enc_ctx-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a>);
<span class="comment">/* take first format from list of supported formats */</span>
enc_ctx-><a name="a46"></a><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a> = encoder-><a name="a47"></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];
enc_ctx-><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a> = (<a name="_a48"></a><a class="code" href="structAVRational.html" title="rational number numerator/denominator">AVRational</a>){1, enc_ctx-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>};
}
<span class="comment">/* Third parameter can be used to pass settings to encoder */</span>
ret = <a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d" title="Initialize the AVCodecContext to use the given AVCodec.">avcodec_open2</a>(enc_ctx, encoder, NULL);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot open video encoder for stream #%u\n"</span>, i);
<span class="keywordflow">return</span> ret;
}
} <span class="keywordflow">else</span> <span class="keywordflow">if</span> (dec_ctx-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a name="a49"></a><a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48afdadbd6c4f612c59f6b6c7c6f84fd347" title="Usually treated as AVMEDIA_TYPE_DATA.">AVMEDIA_TYPE_UNKNOWN</a>) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#ga96970a2980bf6ad28cd403e7dc52d6c5" title="Something went wrong and recovery is not possible.">AV_LOG_FATAL</a>, <span class="stringliteral">"Elementary stream #%d is of unknown type, cannot proceed\n"</span>, i);
<span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gaa6e5781e75b15ce44b0baea170c98a45" title="Invalid data found when processing input.">AVERROR_INVALIDDATA</a>;
} <span class="keywordflow">else</span> {
<span class="comment">/* if this stream must be remuxed */</span>
ret = <a name="a50"></a><a class="code" href="group__lavc__core.html#ga3933b21b9dcb9173df3e56673b7a7d76" title="Copy the settings of the source AVCodecContext into the destination AVCodecContext.">avcodec_copy_context</a>(ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>,
ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Copying stream context failed\n"</span>);
<span class="keywordflow">return</span> ret;
}
}
<span class="keywordflow">if</span> (ofmt_ctx-><a name="a51"></a><a class="code" href="structAVFormatContext.html#a20d80ac07e38ff5c268d15aaf2798b98" title="The output container format.">oformat</a>-><a name="a52"></a><a class="code" href="structAVOutputFormat.html#aad55a00e728a020c1dcfaaf695320445" title="can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE, AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, AVFMT_TS_NONSTRICT">flags</a> & <a name="a53"></a><a class="code" href="avformat_8h.html#ab203c7b734e9c31b7c37d34f6e2c6aef" title="Format wants global header.">AVFMT_GLOBALHEADER</a>)
enc_ctx-><a name="a54"></a><a class="code" href="structAVCodecContext.html#abb01e291550fa3fb96188af4d494587e" title="CODEC_FLAG_*.">flags</a> |= <a name="a55"></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>;
}
<a class="code" href="group__lavf__misc.html#gae2645941f2dc779c307eb6314fd39f10" title="Print detailed information about the input or output format, such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base.">av_dump_format</a>(ofmt_ctx, 0, filename, 1);
<span class="keywordflow">if</span> (!(ofmt_ctx-><a class="code" href="structAVFormatContext.html#a20d80ac07e38ff5c268d15aaf2798b98" title="The output container format.">oformat</a>-><a class="code" href="structAVOutputFormat.html#aad55a00e728a020c1dcfaaf695320445" title="can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE, AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, AVFMT_TS_NONSTRICT">flags</a> & <a name="a56"></a><a class="code" href="avformat_8h.html#a752cce390d480521919aa5d8be24ac0b" title="Demuxer will use avio_open, no opened file should be provided by the caller.">AVFMT_NOFILE</a>)) {
ret = <a name="a57"></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>(&ofmt_ctx-><a name="a58"></a><a class="code" href="structAVFormatContext.html#a1e7324262b6b78522e52064daaa7bc87" title="I/O context.">pb</a>, filename, <a name="a59"></a><a class="code" href="avio_8h.html#a5c9308f296545a8f3b7687d277a6dabc" title="write-only">AVIO_FLAG_WRITE</a>);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Could not open output file '%s'"</span>, filename);
<span class="keywordflow">return</span> ret;
}
}
<span class="comment">/* init muxer, write output file header */</span>
ret = <a name="a60"></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>(ofmt_ctx, NULL);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Error occurred when opening output file\n"</span>);
<span class="keywordflow">return</span> ret;
}
<span class="keywordflow">return</span> 0;
}
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a61"></a><a class="code" href="transcoding_8c.html#a54ad76df48ef886861a2f12bc7a9e7e4">init_filter</a>(<a class="code" href="structFilteringContext.html">FilteringContext</a>* fctx, <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *dec_ctx,
<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *enc_ctx, <span class="keyword">const</span> <span class="keywordtype">char</span> *filter_spec)
{
<span class="keywordtype">char</span> args[512];
<span class="keywordtype">int</span> ret = 0;
<a name="_a62"></a><a class="code" href="structAVFilter.html" title="Filter definition.">AVFilter</a> *buffersrc = NULL;
<a class="code" href="structAVFilter.html" title="Filter definition.">AVFilter</a> *buffersink = NULL;
<a class="code" href="structAVFilterContext.html" title="An instance of a filter.">AVFilterContext</a> *<a name="a63"></a><a class="code" href="filtering__audio_8c.html#a8dce1714a267758c056947f105f66a82">buffersrc_ctx</a> = NULL;
<a class="code" href="structAVFilterContext.html" title="An instance of a filter.">AVFilterContext</a> *<a name="a64"></a><a class="code" href="filtering__audio_8c.html#a5a75197a9aaa609af34cfc0d199acbda">buffersink_ctx</a> = NULL;
<a name="_a65"></a><a class="code" href="structAVFilterInOut.html" title="A linked-list of the inputs/outputs of the filter chain.">AVFilterInOut</a> *outputs = <a name="a66"></a><a class="code" href="group__lavfi.html#ga6e1c2931e15eb4283c59c6ccc8b83919" title="Allocate a single AVFilterInOut entry.">avfilter_inout_alloc</a>();
<a class="code" href="structAVFilterInOut.html" title="A linked-list of the inputs/outputs of the filter chain.">AVFilterInOut</a> *inputs = <a class="code" href="group__lavfi.html#ga6e1c2931e15eb4283c59c6ccc8b83919" title="Allocate a single AVFilterInOut entry.">avfilter_inout_alloc</a>();
<a class="code" href="structAVFilterGraph.html">AVFilterGraph</a> *<a name="a67"></a><a class="code" href="filtering__audio_8c.html#a36c24d3c84d08e2f5a69e7368c211412">filter_graph</a> = <a name="a68"></a><a class="code" href="group__lavfi.html#ga6c778454b86f845805ffd814b4ce51d4" title="Allocate a filter graph.">avfilter_graph_alloc</a>();
<span class="keywordflow">if</span> (!outputs || !inputs || !filter_graph) {
ret = <a name="a69"></a><a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<span class="keywordflow">goto</span> end;
}
<span class="keywordflow">if</span> (dec_ctx-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>) {
buffersrc = <a name="a70"></a><a class="code" href="group__lavfi.html#gadd774ec49e50edf00158248e1bfe4ae6" title="Get a filter definition matching the given name.">avfilter_get_by_name</a>(<span class="stringliteral">"buffer"</span>);
buffersink = <a class="code" href="group__lavfi.html#gadd774ec49e50edf00158248e1bfe4ae6" title="Get a filter definition matching the given name.">avfilter_get_by_name</a>(<span class="stringliteral">"buffersink"</span>);
<span class="keywordflow">if</span> (!buffersrc || !buffersink) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"filtering source or sink element not found\n"</span>);
ret = <a class="code" href="group__lavu__error.html#ga4ebaa288c7684a26a591c501208910e4" title="Unknown error, typically from an external library.">AVERROR_UNKNOWN</a>;
<span class="keywordflow">goto</span> end;
}
snprintf(args, <span class="keyword">sizeof</span>(args),
<span class="stringliteral">"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d"</span>,
dec_ctx-><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956" title="picture width / height.">width</a>, dec_ctx-><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a>, dec_ctx-><a class="code" href="structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2" title="Pixel format, see AV_PIX_FMT_xxx.">pix_fmt</a>,
dec_ctx-><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a>.<a name="a71"></a><a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9" title="numerator">num</a>, dec_ctx-><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a>.<a name="a72"></a><a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3" title="denominator">den</a>,
dec_ctx-><a class="code" href="structAVCodecContext.html#a5252d34fbce300228d4dbda19a8c3293" title="sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...">sample_aspect_ratio</a>.<a class="code" href="structAVRational.html#ae9a98c10a301c5e937095105b6f0fdb9" title="numerator">num</a>,
dec_ctx-><a class="code" href="structAVCodecContext.html#a5252d34fbce300228d4dbda19a8c3293" title="sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...">sample_aspect_ratio</a>.<a class="code" href="structAVRational.html#aee46bdac67d965ac0a4204e753f910c3" title="denominator">den</a>);
ret = <a name="a73"></a><a class="code" href="group__lavfi.html#gac0788a9ab6966dba9318b5d5c7524fea" title="Create and add a filter instance into an existing graph.">avfilter_graph_create_filter</a>(&buffersrc_ctx, buffersrc, <span class="stringliteral">"in"</span>,
args, NULL, filter_graph);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot create buffer source\n"</span>);
<span class="keywordflow">goto</span> end;
}
ret = <a class="code" href="group__lavfi.html#gac0788a9ab6966dba9318b5d5c7524fea" title="Create and add a filter instance into an existing graph.">avfilter_graph_create_filter</a>(&buffersink_ctx, buffersink, <span class="stringliteral">"out"</span>,
NULL, NULL, filter_graph);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot create buffer sink\n"</span>);
<span class="keywordflow">goto</span> end;
}
ret = <a name="a74"></a><a class="code" href="group__opt__set__funcs.html#ga6c32155fd8a96bed2f8cf5ebc030dadf">av_opt_set_bin</a>(buffersink_ctx, <span class="stringliteral">"pix_fmts"</span>,
(uint8_t*)&enc_ctx-><a class="code" href="structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2" title="Pixel format, see AV_PIX_FMT_xxx.">pix_fmt</a>, <span class="keyword">sizeof</span>(enc_ctx-><a class="code" href="structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2" title="Pixel format, see AV_PIX_FMT_xxx.">pix_fmt</a>),
<a name="a75"></a><a class="code" href="group__avoptions.html#ga25801ba4fc9b5313eb33ec84e082dd72" title="Search in possible children of the given object first.">AV_OPT_SEARCH_CHILDREN</a>);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot set output pixel format\n"</span>);
<span class="keywordflow">goto</span> end;
}
} <span class="keywordflow">else</span> <span class="keywordflow">if</span> (dec_ctx-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48a7b4e33b8f30ac94d34ce8d9f7c33927a">AVMEDIA_TYPE_AUDIO</a>) {
buffersrc = <a class="code" href="group__lavfi.html#gadd774ec49e50edf00158248e1bfe4ae6" title="Get a filter definition matching the given name.">avfilter_get_by_name</a>(<span class="stringliteral">"abuffer"</span>);
buffersink = <a class="code" href="group__lavfi.html#gadd774ec49e50edf00158248e1bfe4ae6" title="Get a filter definition matching the given name.">avfilter_get_by_name</a>(<span class="stringliteral">"abuffersink"</span>);
<span class="keywordflow">if</span> (!buffersrc || !buffersink) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"filtering source or sink element not found\n"</span>);
ret = <a class="code" href="group__lavu__error.html#ga4ebaa288c7684a26a591c501208910e4" title="Unknown error, typically from an external library.">AVERROR_UNKNOWN</a>;
<span class="keywordflow">goto</span> end;
}
<span class="keywordflow">if</span> (!dec_ctx-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a>)
dec_ctx-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a> =
<a name="a76"></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>(dec_ctx-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>);
snprintf(args, <span class="keyword">sizeof</span>(args),
<span class="stringliteral">"time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"</span>PRIx64,
dec_ctx-><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" 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>, dec_ctx-><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" 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>, dec_ctx-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>,
<a name="a77"></a><a class="code" href="group__lavu__sampfmts.html#ga31b9d149b2de9821a65f4f5612970838" title="Return the name of sample_fmt, or NULL if sample_fmt is not recognized.">av_get_sample_fmt_name</a>(dec_ctx-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>),
dec_ctx-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a>);
ret = <a class="code" href="group__lavfi.html#gac0788a9ab6966dba9318b5d5c7524fea" title="Create and add a filter instance into an existing graph.">avfilter_graph_create_filter</a>(&buffersrc_ctx, buffersrc, <span class="stringliteral">"in"</span>,
args, NULL, filter_graph);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot create audio buffer source\n"</span>);
<span class="keywordflow">goto</span> end;
}
ret = <a class="code" href="group__lavfi.html#gac0788a9ab6966dba9318b5d5c7524fea" title="Create and add a filter instance into an existing graph.">avfilter_graph_create_filter</a>(&buffersink_ctx, buffersink, <span class="stringliteral">"out"</span>,
NULL, NULL, filter_graph);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot create audio buffer sink\n"</span>);
<span class="keywordflow">goto</span> end;
}
ret = <a class="code" href="group__opt__set__funcs.html#ga6c32155fd8a96bed2f8cf5ebc030dadf">av_opt_set_bin</a>(buffersink_ctx, <span class="stringliteral">"sample_fmts"</span>,
(uint8_t*)&enc_ctx-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>, <span class="keyword">sizeof</span>(enc_ctx-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>),
<a class="code" href="group__avoptions.html#ga25801ba4fc9b5313eb33ec84e082dd72" title="Search in possible children of the given object first.">AV_OPT_SEARCH_CHILDREN</a>);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot set output sample format\n"</span>);
<span class="keywordflow">goto</span> end;
}
ret = <a class="code" href="group__opt__set__funcs.html#ga6c32155fd8a96bed2f8cf5ebc030dadf">av_opt_set_bin</a>(buffersink_ctx, <span class="stringliteral">"channel_layouts"</span>,
(uint8_t*)&enc_ctx-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a>,
<span class="keyword">sizeof</span>(enc_ctx-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06" title="Audio channel layout.">channel_layout</a>), <a class="code" href="group__avoptions.html#ga25801ba4fc9b5313eb33ec84e082dd72" title="Search in possible children of the given object first.">AV_OPT_SEARCH_CHILDREN</a>);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot set output channel layout\n"</span>);
<span class="keywordflow">goto</span> end;
}
ret = <a class="code" href="group__opt__set__funcs.html#ga6c32155fd8a96bed2f8cf5ebc030dadf">av_opt_set_bin</a>(buffersink_ctx, <span class="stringliteral">"sample_rates"</span>,
(uint8_t*)&enc_ctx-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>, <span class="keyword">sizeof</span>(enc_ctx-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>),
<a class="code" href="group__avoptions.html#ga25801ba4fc9b5313eb33ec84e082dd72" title="Search in possible children of the given object first.">AV_OPT_SEARCH_CHILDREN</a>);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Cannot set output sample rate\n"</span>);
<span class="keywordflow">goto</span> end;
}
} <span class="keywordflow">else</span> {
ret = <a class="code" href="group__lavu__error.html#ga4ebaa288c7684a26a591c501208910e4" title="Unknown error, typically from an external library.">AVERROR_UNKNOWN</a>;
<span class="keywordflow">goto</span> end;
}
<span class="comment">/* Endpoints for the filter graph. */</span>
outputs-><a name="a78"></a><a class="code" href="structAVFilterInOut.html#a88afecac258f51aab7e9a9db9e7a4d58" title="unique name for this input/output in the list">name</a> = <a name="a79"></a><a class="code" href="group__lavu__mem.html#ga7c352f4cff02184f005323691375fea9" title="Duplicate the string s.">av_strdup</a>(<span class="stringliteral">"in"</span>);
outputs-><a name="a80"></a><a class="code" href="structAVFilterInOut.html#a3227857d0b955b639f4950d13e4e6f40" title="filter context associated to this input/output">filter_ctx</a> = <a class="code" href="filtering__audio_8c.html#a8dce1714a267758c056947f105f66a82">buffersrc_ctx</a>;
outputs-><a name="a81"></a><a class="code" href="structAVFilterInOut.html#a386ff90d40aa22f5612dd5eca734ed48" title="index of the filt_ctx pad to use for linking">pad_idx</a> = 0;
outputs-><a name="a82"></a><a class="code" href="structAVFilterInOut.html#af8c8cf9ffb650974d19e791f5bb7cf33" title="next input/input in the list, NULL if this is the last">next</a> = NULL;
inputs-><a class="code" href="structAVFilterInOut.html#a88afecac258f51aab7e9a9db9e7a4d58" title="unique name for this input/output in the list">name</a> = <a class="code" href="group__lavu__mem.html#ga7c352f4cff02184f005323691375fea9" title="Duplicate the string s.">av_strdup</a>(<span class="stringliteral">"out"</span>);
inputs-><a class="code" href="structAVFilterInOut.html#a3227857d0b955b639f4950d13e4e6f40" title="filter context associated to this input/output">filter_ctx</a> = <a class="code" href="filtering__audio_8c.html#a5a75197a9aaa609af34cfc0d199acbda">buffersink_ctx</a>;
inputs-><a class="code" href="structAVFilterInOut.html#a386ff90d40aa22f5612dd5eca734ed48" title="index of the filt_ctx pad to use for linking">pad_idx</a> = 0;
inputs-><a class="code" href="structAVFilterInOut.html#af8c8cf9ffb650974d19e791f5bb7cf33" title="next input/input in the list, NULL if this is the last">next</a> = NULL;
<span class="keywordflow">if</span> (!outputs-><a class="code" href="structAVFilterInOut.html#a88afecac258f51aab7e9a9db9e7a4d58" title="unique name for this input/output in the list">name</a> || !inputs-><a class="code" href="structAVFilterInOut.html#a88afecac258f51aab7e9a9db9e7a4d58" title="unique name for this input/output in the list">name</a>) {
ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<span class="keywordflow">goto</span> end;
}
<span class="keywordflow">if</span> ((ret = <a name="a83"></a><a class="code" href="group__lavfi.html#ga34f4ff420bd58da6747a3ff1fbedd001" title="Add a graph described by a string to a graph.">avfilter_graph_parse_ptr</a>(filter_graph, filter_spec,
&inputs, &outputs, NULL)) < 0)
<span class="keywordflow">goto</span> end;
<span class="keywordflow">if</span> ((ret = <a name="a84"></a><a class="code" href="group__lavfi.html#ga1896c46b7bc6ff1bdb1a4815faa9ad07" title="Check validity and configure all the links and formats in the graph.">avfilter_graph_config</a>(filter_graph, NULL)) < 0)
<span class="keywordflow">goto</span> end;
<span class="comment">/* Fill FilteringContext */</span>
fctx-><a class="code" href="structFilteringContext.html#a25c500d3728df3a9f904e6d86cf55f11">buffersrc_ctx</a> = <a class="code" href="filtering__audio_8c.html#a8dce1714a267758c056947f105f66a82">buffersrc_ctx</a>;
fctx-><a class="code" href="structFilteringContext.html#a4476c9e6fb492172c909ae4a47c47233">buffersink_ctx</a> = <a class="code" href="filtering__audio_8c.html#a5a75197a9aaa609af34cfc0d199acbda">buffersink_ctx</a>;
fctx-><a class="code" href="structFilteringContext.html#aaf35e44d4e6100095b1db444e2d316cd">filter_graph</a> = <a class="code" href="filtering__audio_8c.html#a36c24d3c84d08e2f5a69e7368c211412">filter_graph</a>;
end:
<a name="a85"></a><a class="code" href="group__lavfi.html#ga294500a9856260eb1552354fd9d9a6c4" title="Free the supplied list of AVFilterInOut and set *inout to NULL.">avfilter_inout_free</a>(&inputs);
<a class="code" href="group__lavfi.html#ga294500a9856260eb1552354fd9d9a6c4" title="Free the supplied list of AVFilterInOut and set *inout to NULL.">avfilter_inout_free</a>(&outputs);
<span class="keywordflow">return</span> ret;
}
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a86"></a><a class="code" href="filtering__audio_8c.html#ac25a104c80c6a7d21fb06a438a6965ba">init_filters</a>(<span class="keywordtype">void</span>)
{
<span class="keyword">const</span> <span class="keywordtype">char</span> *filter_spec;
<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
<span class="keywordtype">int</span> ret;
filter_ctx = <a name="a87"></a><a class="code" href="group__lavu__mem.html#gab62b093b46dce5fe4e3e1d58bdb255da">av_malloc_array</a>(ifmt_ctx-><a class="code" href="structAVFormatContext.html#a0b748d924898b08b89ff4974afd17285" title="Number of elements in AVFormatContext.streams.">nb_streams</a>, <span class="keyword">sizeof</span>(*filter_ctx));
<span class="keywordflow">if</span> (!filter_ctx)
<span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<span class="keywordflow">for</span> (i = 0; i < ifmt_ctx-><a class="code" href="structAVFormatContext.html#a0b748d924898b08b89ff4974afd17285" title="Number of elements in AVFormatContext.streams.">nb_streams</a>; i++) {
filter_ctx[i].<a class="code" href="structFilteringContext.html#a25c500d3728df3a9f904e6d86cf55f11">buffersrc_ctx</a> = NULL;
filter_ctx[i].<a class="code" href="structFilteringContext.html#a4476c9e6fb492172c909ae4a47c47233">buffersink_ctx</a> = NULL;
filter_ctx[i].<a class="code" href="structFilteringContext.html#aaf35e44d4e6100095b1db444e2d316cd">filter_graph</a> = NULL;
<span class="keywordflow">if</span> (!(ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48a7b4e33b8f30ac94d34ce8d9f7c33927a">AVMEDIA_TYPE_AUDIO</a>
|| ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>))
<span class="keywordflow">continue</span>;
<span class="keywordflow">if</span> (ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>)
filter_spec = <span class="stringliteral">"null"</span>; <span class="comment">/* passthrough (dummy) filter for video */</span>
<span class="keywordflow">else</span>
filter_spec = <span class="stringliteral">"anull"</span>; <span class="comment">/* passthrough (dummy) filter for audio */</span>
ret = <a class="code" href="transcoding_8c.html#a54ad76df48ef886861a2f12bc7a9e7e4">init_filter</a>(&filter_ctx[i], ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>,
ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>, filter_spec);
<span class="keywordflow">if</span> (ret)
<span class="keywordflow">return</span> ret;
}
<span class="keywordflow">return</span> 0;
}
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a88"></a><a class="code" href="transcoding_8c.html#afb371e273a9d2e9cc0539a6453913533">encode_write_frame</a>(<a name="_a89"></a><a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> *filt_frame, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> stream_index, <span class="keywordtype">int</span> *got_frame) {
<span class="keywordtype">int</span> ret;
<span class="keywordtype">int</span> got_frame_local;
<a name="_a90"></a><a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> enc_pkt;
int (*enc_func)(<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *, <a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> *, <span class="keyword">const</span> <a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> *, <span class="keywordtype">int</span> *) =
(ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a> ==
<a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>) ? <a name="a91"></a><a class="code" href="group__lavc__encoding.html#gaa2dc9e9ea2567ebb2801a08153c7306b" title="Encode a frame of video.">avcodec_encode_video2</a> : <a name="a92"></a><a class="code" href="group__lavc__encoding.html#ga93a49fbd0973b216dcb8a8c5dffe1d82" title="Encode a frame of audio.">avcodec_encode_audio2</a>;
<span class="keywordflow">if</span> (!got_frame)
got_frame = &got_frame_local;
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a name="a93"></a><a class="code" href="group__lavu__log__constants.html#gad172eacfed8653e454c6fdcbe53baab3" title="Standard information.">AV_LOG_INFO</a>, <span class="stringliteral">"Encoding frame\n"</span>);
<span class="comment">/* encode filtered frame */</span>
enc_pkt.<a name="a94"></a><a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL;
enc_pkt.<a name="a95"></a><a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;
<a name="a96"></a><a class="code" href="group__lavc__packet.html#gac9cb9756175b96e7441575803757fb73" title="Initialize optional fields of a packet with default values.">av_init_packet</a>(&enc_pkt);
ret = enc_func(ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>, &enc_pkt,
filt_frame, got_frame);
<a name="a97"></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>(&filt_frame);
<span class="keywordflow">if</span> (ret < 0)
<span class="keywordflow">return</span> ret;
<span class="keywordflow">if</span> (!(*got_frame))
<span class="keywordflow">return</span> 0;
<span class="comment">/* prepare packet for muxing */</span>
enc_pkt.<a name="a98"></a><a class="code" href="structAVPacket.html#a0d1cb9b5a32b00fb6edc81ea3aae2a49">stream_index</a> = stream_index;
<a name="a99"></a><a class="code" href="group__lavc__packet.html#gae5c86e4d93f6e7aa62ef2c60763ea67e" title="Convert valid timing fields (timestamps / durations) in a packet from one timebase to another...">av_packet_rescale_ts</a>(&enc_pkt,
ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>-><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a>,
ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><a name="a100"></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 class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a name="a101"></a><a class="code" href="group__lavu__log__constants.html#ga5b7221c3afd06848486776bd834a58a5" title="Stuff which is only useful for libav* developers.">AV_LOG_DEBUG</a>, <span class="stringliteral">"Muxing frame\n"</span>);
<span class="comment">/* mux encoded frame */</span>
ret = <a name="a102"></a><a class="code" href="group__lavf__encoding.html#ga37352ed2c63493c38219d935e71db6c1" title="Write a packet to an output media file ensuring correct interleaving.">av_interleaved_write_frame</a>(ofmt_ctx, &enc_pkt);
<span class="keywordflow">return</span> ret;
}
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a103"></a><a class="code" href="transcoding_8c.html#a255192428438daf73b9f8060c0815712">filter_encode_write_frame</a>(AVFrame *<a name="a104"></a><a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> stream_index)
{
<span class="keywordtype">int</span> ret;
AVFrame *filt_frame;
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gad172eacfed8653e454c6fdcbe53baab3" title="Standard information.">AV_LOG_INFO</a>, <span class="stringliteral">"Pushing decoded frame to filters\n"</span>);
<span class="comment">/* push the decoded frame into the filtergraph */</span>
ret = <a name="a105"></a><a class="code" href="group__lavfi__buffersrc.html#ga54133fc5421777515032c593bc00f191" title="Add a frame to the buffer source.">av_buffersrc_add_frame_flags</a>(filter_ctx[stream_index].buffersrc_ctx,
frame, 0);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Error while feeding the filtergraph\n"</span>);
<span class="keywordflow">return</span> ret;
}
<span class="comment">/* pull filtered frames from the filtergraph */</span>
<span class="keywordflow">while</span> (1) {
filt_frame = <a name="a106"></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>();
<span class="keywordflow">if</span> (!filt_frame) {
ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<span class="keywordflow">break</span>;
}
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gad172eacfed8653e454c6fdcbe53baab3" title="Standard information.">AV_LOG_INFO</a>, <span class="stringliteral">"Pulling filtered frame from filters\n"</span>);
ret = <a name="a107"></a><a class="code" href="group__lavfi__buffersink.html#ga653228f4cbca427c654d844a5fc59cfa" title="Get a frame with filtered data from sink and put it in frame.">av_buffersink_get_frame</a>(filter_ctx[stream_index].buffersink_ctx,
filt_frame);
<span class="keywordflow">if</span> (ret < 0) {
<span class="comment">/* if no more frames for output - returns AVERROR(EAGAIN)</span>
<span class="comment"> * if flushed and no more frames for output - returns AVERROR_EOF</span>
<span class="comment"> * rewrite retcode to 0 to show it as normal procedure completion</span>
<span class="comment"> */</span>
<span class="keywordflow">if</span> (ret == <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(EAGAIN) || ret == <a name="a108"></a><a class="code" href="group__lavu__error.html#gab4faa0afdf35076914824200331defff" title="End of file.">AVERROR_EOF</a>)
ret = 0;
<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>(&filt_frame);
<span class="keywordflow">break</span>;
}
filt_frame-><a name="a109"></a><a class="code" href="structAVFrame.html#af9920fc3fbfa347b8943ae461b50d18b" title="Picture type of the frame.">pict_type</a> = <a name="a110"></a><a class="code" href="group__lavu__picture.html#ggae6cbcab1f70d8e476757f1c1f5a0a78ea33183189d771e3325ccdd36fa980b6f6" title="Undefined.">AV_PICTURE_TYPE_NONE</a>;
ret = <a class="code" href="transcoding_8c.html#afb371e273a9d2e9cc0539a6453913533">encode_write_frame</a>(filt_frame, stream_index, NULL);
<span class="keywordflow">if</span> (ret < 0)
<span class="keywordflow">break</span>;
}
<span class="keywordflow">return</span> ret;
}
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a111"></a><a class="code" href="transcoding_8c.html#ad55ba3d9c6ebe490eb8766a91b627d3e">flush_encoder</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> stream_index)
{
<span class="keywordtype">int</span> ret;
<span class="keywordtype">int</span> got_frame;
<span class="keywordflow">if</span> (!(ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>-><a name="a112"></a><a class="code" href="structAVCodecContext.html#ab00398f08f8622c3e6c0f1a12eb99808">codec</a>-><a name="a113"></a><a class="code" href="structAVCodec.html#af51f7ff3dac8b730f46b9713e49a2518" title="Codec capabilities.">capabilities</a> &
<a name="a114"></a><a class="code" href="group__lavc__core.html#gad81abca6e6ea7e0ac25f328e7425698f" title="Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...">CODEC_CAP_DELAY</a>))
<span class="keywordflow">return</span> 0;
<span class="keywordflow">while</span> (1) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gad172eacfed8653e454c6fdcbe53baab3" title="Standard information.">AV_LOG_INFO</a>, <span class="stringliteral">"Flushing stream #%u encoder\n"</span>, stream_index);
ret = <a class="code" href="transcoding_8c.html#afb371e273a9d2e9cc0539a6453913533">encode_write_frame</a>(NULL, stream_index, &got_frame);
<span class="keywordflow">if</span> (ret < 0)
<span class="keywordflow">break</span>;
<span class="keywordflow">if</span> (!got_frame)
<span class="keywordflow">return</span> 0;
}
<span class="keywordflow">return</span> ret;
}
<span class="keywordtype">int</span> <a name="a115"></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)
{
<span class="keywordtype">int</span> ret;
AVPacket packet = { .data = NULL, .size = 0 };
AVFrame *frame = NULL;
<span class="keyword">enum</span> <a class="code" href="group__lavu__misc.html#ga9a84bba4713dfced21a1a56163be1f48">AVMediaType</a> type;
<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> stream_index;
<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
<span class="keywordtype">int</span> got_frame;
int (*dec_func)(<a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *, AVFrame *, <span class="keywordtype">int</span> *, <span class="keyword">const</span> AVPacket *);
<span class="keywordflow">if</span> (argc != 3) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Usage: %s <input file> <output file>\n"</span>, argv[0]);
<span class="keywordflow">return</span> 1;
}
<a name="a116"></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>();
<a name="a117"></a><a class="code" href="group__lavfi.html#ga2bf8f0a6e2599faf4bf97b04a5a25149" title="Initialize the filter system.">avfilter_register_all</a>();
<span class="keywordflow">if</span> ((ret = <a class="code" href="filtering__audio_8c.html#abd04bf1a933d4d2698482f4949c61fed">open_input_file</a>(argv[1])) < 0)
<span class="keywordflow">goto</span> end;
<span class="keywordflow">if</span> ((ret = <a class="code" href="transcode__aac_8c.html#a617f4760254c119fc7caa222f3fcbd21" title="Open an output file and the required encoder.">open_output_file</a>(argv[2])) < 0)
<span class="keywordflow">goto</span> end;
<span class="keywordflow">if</span> ((ret = <a class="code" href="filtering__audio_8c.html#ac25a104c80c6a7d21fb06a438a6965ba">init_filters</a>()) < 0)
<span class="keywordflow">goto</span> end;
<span class="comment">/* read all packets */</span>
<span class="keywordflow">while</span> (1) {
<span class="keywordflow">if</span> ((ret = <a name="a118"></a><a class="code" href="group__lavf__decoding.html#ga4fdb3084415a82e3810de6ee60e46a61" title="Return the next frame of a stream.">av_read_frame</a>(ifmt_ctx, &packet)) < 0)
<span class="keywordflow">break</span>;
stream_index = packet.<a class="code" href="structAVPacket.html#a0d1cb9b5a32b00fb6edc81ea3aae2a49">stream_index</a>;
type = ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[packet.<a class="code" href="structAVPacket.html#a0d1cb9b5a32b00fb6edc81ea3aae2a49">stream_index</a>]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>-><a class="code" href="structAVCodecContext.html#a3f99ca3115c44e6d7772c9384faf15e6">codec_type</a>;
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#ga5b7221c3afd06848486776bd834a58a5" title="Stuff which is only useful for libav* developers.">AV_LOG_DEBUG</a>, <span class="stringliteral">"Demuxer gave frame of stream_index %u\n"</span>,
stream_index);
<span class="keywordflow">if</span> (filter_ctx[stream_index].filter_graph) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#ga5b7221c3afd06848486776bd834a58a5" title="Stuff which is only useful for libav* developers.">AV_LOG_DEBUG</a>, <span class="stringliteral">"Going to reencode&filter the frame\n"</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>();
<span class="keywordflow">if</span> (!frame) {
ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<span class="keywordflow">break</span>;
}
<a class="code" href="group__lavc__packet.html#gae5c86e4d93f6e7aa62ef2c60763ea67e" title="Convert valid timing fields (timestamps / durations) in a packet from one timebase to another...">av_packet_rescale_ts</a>(&packet,
ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><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>,
ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>-><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589" title="This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...">time_base</a>);
dec_func = (type == <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>) ? <a name="a119"></a><a class="code" href="group__lavc__decoding.html#ga99ee61b6dcffb7817a275d39da58cc74" title="Decode the video frame of size avpkt->size from avpkt->data into picture.">avcodec_decode_video2</a> :
<a name="a120"></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>;
ret = dec_func(ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>, frame,
&got_frame, &packet);
<span class="keywordflow">if</span> (ret < 0) {
<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 class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Decoding failed\n"</span>);
<span class="keywordflow">break</span>;
}
<span class="keywordflow">if</span> (got_frame) {
frame-><a name="a121"></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 name="a122"></a><a class="code" href="group__lavu__frame.html#gacb9d9082c10e625e51a68caceabd4458" title="Accessors for some AVFrame fields.">av_frame_get_best_effort_timestamp</a>(frame);
ret = <a class="code" href="transcoding_8c.html#a255192428438daf73b9f8060c0815712">filter_encode_write_frame</a>(frame, stream_index);
<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">if</span> (ret < 0)
<span class="keywordflow">goto</span> end;
} <span class="keywordflow">else</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>(&frame);
}
} <span class="keywordflow">else</span> {
<span class="comment">/* remux this frame without reencoding */</span>
<a class="code" href="group__lavc__packet.html#gae5c86e4d93f6e7aa62ef2c60763ea67e" title="Convert valid timing fields (timestamps / durations) in a packet from one timebase to another...">av_packet_rescale_ts</a>(&packet,
ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><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>,
ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index]-><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>);
ret = <a class="code" href="group__lavf__encoding.html#ga37352ed2c63493c38219d935e71db6c1" title="Write a packet to an output media file ensuring correct interleaving.">av_interleaved_write_frame</a>(ofmt_ctx, &packet);
<span class="keywordflow">if</span> (ret < 0)
<span class="keywordflow">goto</span> end;
}
<a name="a123"></a><a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&packet);
}
<span class="comment">/* flush filters and encoders */</span>
<span class="keywordflow">for</span> (i = 0; i < ifmt_ctx-><a class="code" href="structAVFormatContext.html#a0b748d924898b08b89ff4974afd17285" title="Number of elements in AVFormatContext.streams.">nb_streams</a>; i++) {
<span class="comment">/* flush filter */</span>
<span class="keywordflow">if</span> (!filter_ctx[i].filter_graph)
<span class="keywordflow">continue</span>;
ret = <a class="code" href="transcoding_8c.html#a255192428438daf73b9f8060c0815712">filter_encode_write_frame</a>(NULL, i);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Flushing filter failed\n"</span>);
<span class="keywordflow">goto</span> end;
}
<span class="comment">/* flush encoder */</span>
ret = <a class="code" href="transcoding_8c.html#ad55ba3d9c6ebe490eb8766a91b627d3e">flush_encoder</a>(i);
<span class="keywordflow">if</span> (ret < 0) {
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Flushing encoder failed\n"</span>);
<span class="keywordflow">goto</span> end;
}
}
<a name="a124"></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>(ofmt_ctx);
end:
<a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&packet);
<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">for</span> (i = 0; i < ifmt_ctx-><a class="code" href="structAVFormatContext.html#a0b748d924898b08b89ff4974afd17285" title="Number of elements in AVFormatContext.streams.">nb_streams</a>; i++) {
<a name="a125"></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>(ifmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>);
<span class="keywordflow">if</span> (ofmt_ctx && ofmt_ctx-><a class="code" href="structAVFormatContext.html#a0b748d924898b08b89ff4974afd17285" title="Number of elements in AVFormatContext.streams.">nb_streams</a> > i && ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i] && ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</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>(ofmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[i]-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>);
<span class="keywordflow">if</span> (filter_ctx && filter_ctx[i].filter_graph)
<a name="a126"></a><a class="code" href="group__lavfi.html#ga871684449dac05050df238a18d0d493b" title="Free a graph, destroy its links, and set *graph to NULL.">avfilter_graph_free</a>(&filter_ctx[i].filter_graph);
}
<a name="a127"></a><a class="code" href="group__lavu__mem.html#ga0c9096f498624c525aa2315b8a20c411" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc().">av_free</a>(filter_ctx);
<a name="a128"></a><a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(&ifmt_ctx);
<span class="keywordflow">if</span> (ofmt_ctx && !(ofmt_ctx-><a class="code" href="structAVFormatContext.html#a20d80ac07e38ff5c268d15aaf2798b98" title="The output container format.">oformat</a>-><a class="code" href="structAVOutputFormat.html#aad55a00e728a020c1dcfaaf695320445" title="can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE, AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, AVFMT_TS_NONSTRICT">flags</a> & <a class="code" href="avformat_8h.html#a752cce390d480521919aa5d8be24ac0b" title="Demuxer will use avio_open, no opened file should be provided by the caller.">AVFMT_NOFILE</a>))
<a name="a129"></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>(&ofmt_ctx-><a class="code" href="structAVFormatContext.html#a1e7324262b6b78522e52064daaa7bc87" title="I/O context.">pb</a>);
<a name="a130"></a><a class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445" title="Free an AVFormatContext and all its streams.">avformat_free_context</a>(ofmt_ctx);
<span class="keywordflow">if</span> (ret < 0)
<a class="code" href="group__lavu__log.html#gabd386ffd4b27637cf34e98d5d1a6e8ae" title="Send the specified message to the log if the level is less than or equal to the current av_log_level...">av_log</a>(NULL, <a class="code" href="group__lavu__log__constants.html#gaffe151ff4cd8a24b2e77ac8d9616c85c" title="Something went wrong and cannot losslessly be recovered.">AV_LOG_ERROR</a>, <span class="stringliteral">"Error occurred: %s\n"</span>, <a name="a131"></a><a class="code" href="group__lavu__error.html#gac4f6e109c242c81aeee21868d3f35e12" title="Convenience macro, the return value should be used only directly in function arguments but never stan...">av_err2str</a>(ret));
<span class="keywordflow">return</span> ret ? 1 : 0;
}
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