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<a href="demuxing__decoding_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (c) 2012 Stefano Sabatini</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span>
<a name="l00005"></a>00005 <span class="comment"> * of this software and associated documentation files (the "Software"), to deal</span>
<a name="l00006"></a>00006 <span class="comment"> * in the Software without restriction, including without limitation the rights</span>
<a name="l00007"></a>00007 <span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
<a name="l00008"></a>00008 <span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span>
<a name="l00009"></a>00009 <span class="comment"> * furnished to do so, subject to the following conditions:</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> * The above copyright notice and this permission notice shall be included in</span>
<a name="l00012"></a>00012 <span class="comment"> * all copies or substantial portions of the Software.</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
<a name="l00015"></a>00015 <span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
<a name="l00016"></a>00016 <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span>
<a name="l00017"></a>00017 <span class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
<a name="l00018"></a>00018 <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
<a name="l00019"></a>00019 <span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span>
<a name="l00020"></a>00020 <span class="comment"> * THE SOFTWARE.</span>
<a name="l00021"></a>00021 <span class="comment"> */</span>
<a name="l00022"></a>00022 <span class="comment"></span>
<a name="l00023"></a>00023 <span class="comment">/**</span>
<a name="l00024"></a>00024 <span class="comment"> * @file</span>
<a name="l00025"></a>00025 <span class="comment"> * Demuxing and decoding example.</span>
<a name="l00026"></a>00026 <span class="comment"> *</span>
<a name="l00027"></a>00027 <span class="comment"> * Show how to use the libavformat and libavcodec API to demux and</span>
<a name="l00028"></a>00028 <span class="comment"> * decode audio and video data.</span>
<a name="l00029"></a>00029 <span class="comment"> * @example demuxing_decoding.c</span>
<a name="l00030"></a>00030 <span class="comment"> */</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="preprocessor">#include <<a class="code" href="imgutils_8h.html" title="misc image utilities">libavutil/imgutils.h</a>></span>
<a name="l00033"></a>00033 <span class="preprocessor">#include <<a class="code" href="samplefmt_8h.html">libavutil/samplefmt.h</a>></span>
<a name="l00034"></a>00034 <span class="preprocessor">#include <<a class="code" href="timestamp_8h.html" title="timestamp utils, mostly useful for debugging/logging purposes">libavutil/timestamp.h</a>></span>
<a name="l00035"></a>00035 <span class="preprocessor">#include <<a class="code" href="avformat_8h.html" title="Main libavformat public API header.">libavformat/avformat.h</a>></span>
<a name="l00036"></a>00036
<a name="l00037"></a><a class="code" href="demuxing__decoding_8c.html#a409462acdf7aebe5bfbe1bcd811efa5d">00037</a> <span class="keyword">static</span> <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *<a class="code" href="demuxing__decoding_8c.html#a409462acdf7aebe5bfbe1bcd811efa5d">fmt_ctx</a> = NULL;
<a name="l00038"></a><a class="code" href="demuxing__decoding_8c.html#a2e10f5f24d4c8dd311b8eedc376accf5">00038</a> <span class="keyword">static</span> <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *<a class="code" href="demuxing__decoding_8c.html#a2e10f5f24d4c8dd311b8eedc376accf5">video_dec_ctx</a> = NULL, *<a class="code" href="demuxing__decoding_8c.html#adecce4fda9b9d4fc0d6713d461755cfd">audio_dec_ctx</a>;
<a name="l00039"></a><a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">00039</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a>, <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a>;
<a name="l00040"></a><a class="code" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">00040</a> <span class="keyword">static</span> <span class="keyword">enum</span> <a class="code" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5" title="Pixel format.">AVPixelFormat</a> <a class="code" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a>;
<a name="l00041"></a><a class="code" href="demuxing__decoding_8c.html#a9decdb9a2529baa6bd2a855a12f1f0fc">00041</a> <span class="keyword">static</span> <a class="code" href="structAVStream.html" title="Stream structure.">AVStream</a> *<a class="code" href="demuxing__decoding_8c.html#a9decdb9a2529baa6bd2a855a12f1f0fc">video_stream</a> = NULL, *<a class="code" href="demuxing__decoding_8c.html#ab269038fe8cd6f8fa4ccec9eaf939345">audio_stream</a> = NULL;
<a name="l00042"></a><a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">00042</a> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">src_filename</a> = NULL;
<a name="l00043"></a><a class="code" href="demuxing__decoding_8c.html#a780830fc3afc836feb64d80eef4185b5">00043</a> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="demuxing__decoding_8c.html#a780830fc3afc836feb64d80eef4185b5">video_dst_filename</a> = NULL;
<a name="l00044"></a><a class="code" href="demuxing__decoding_8c.html#a9f79f9440c018d4eb8448d849f35f467">00044</a> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="demuxing__decoding_8c.html#a9f79f9440c018d4eb8448d849f35f467">audio_dst_filename</a> = NULL;
<a name="l00045"></a><a class="code" href="demuxing__decoding_8c.html#ac3ad9da7180c9a9baa85e968eb6937e3">00045</a> <span class="keyword">static</span> FILE *<a class="code" href="demuxing__decoding_8c.html#ac3ad9da7180c9a9baa85e968eb6937e3">video_dst_file</a> = NULL;
<a name="l00046"></a><a class="code" href="demuxing__decoding_8c.html#af0d7c67df6575ed6b3b7de4d843ed7a6">00046</a> <span class="keyword">static</span> FILE *<a class="code" href="demuxing__decoding_8c.html#af0d7c67df6575ed6b3b7de4d843ed7a6">audio_dst_file</a> = NULL;
<a name="l00047"></a>00047
<a name="l00048"></a><a class="code" href="demuxing__decoding_8c.html#a0b39e94f88658412ecadb5e2116baccc">00048</a> <span class="keyword">static</span> uint8_t *<a class="code" href="demuxing__decoding_8c.html#a0b39e94f88658412ecadb5e2116baccc">video_dst_data</a>[4] = {NULL};
<a name="l00049"></a><a class="code" href="demuxing__decoding_8c.html#a8dbcd4dc85b9345bde18395026d0ffe4">00049</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#a8dbcd4dc85b9345bde18395026d0ffe4">video_dst_linesize</a>[4];
<a name="l00050"></a><a class="code" href="demuxing__decoding_8c.html#a849609cb135f2d344ff03e99610b43df">00050</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#a849609cb135f2d344ff03e99610b43df">video_dst_bufsize</a>;
<a name="l00051"></a>00051
<a name="l00052"></a><a class="code" href="demuxing__decoding_8c.html#af35f69f407b98b5244f837e25813bc11">00052</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#af35f69f407b98b5244f837e25813bc11">video_stream_idx</a> = -1, <a class="code" href="demuxing__decoding_8c.html#a16cd83c72f483b9fa2844c5516452798">audio_stream_idx</a> = -1;
<a name="l00053"></a><a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">00053</a> <span class="keyword">static</span> <a class="code" href="structAVFrame.html" title="This structure describes decoded (raw) audio or video data.">AVFrame</a> *<a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a> = NULL;
<a name="l00054"></a><a class="code" href="demuxing__decoding_8c.html#a3d4c6562f0b27cf0cacbbea5c038c090">00054</a> <span class="keyword">static</span> <a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> <a class="code" href="demuxing__decoding_8c.html#a3d4c6562f0b27cf0cacbbea5c038c090">pkt</a>;
<a name="l00055"></a><a class="code" href="demuxing__decoding_8c.html#ac9f496a4d3575928c5b94568bbedd753">00055</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#ac9f496a4d3575928c5b94568bbedd753">video_frame_count</a> = 0;
<a name="l00056"></a><a class="code" href="demuxing__decoding_8c.html#a48eccd48ea840bc45254f44995320463">00056</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#a48eccd48ea840bc45254f44995320463">audio_frame_count</a> = 0;
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="comment">/* The different ways of decoding and managing data memory. You are not</span>
<a name="l00059"></a>00059 <span class="comment"> * supposed to support all the modes in your application but pick the one most</span>
<a name="l00060"></a>00060 <span class="comment"> * appropriate to your needs. Look for the use of api_mode in this example to</span>
<a name="l00061"></a>00061 <span class="comment"> * see what are the differences of API usage between them */</span>
<a name="l00062"></a>00062 <span class="keyword">enum</span> {
<a name="l00063"></a><a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2dab844a3f0eaa875df057068f0367489b1">00063</a> <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2dab844a3f0eaa875df057068f0367489b1">API_MODE_OLD</a> = 0, <span class="comment">/* old method, deprecated */</span>
<a name="l00064"></a><a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2da8a168414de8770c24226d90ba3d1f7cc">00064</a> <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2da8a168414de8770c24226d90ba3d1f7cc">API_MODE_NEW_API_REF_COUNT</a> = 1, <span class="comment">/* new method, using the frame reference counting */</span>
<a name="l00065"></a><a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2da328cfb892cfa821bdad4cad6ab6d9ea1">00065</a> <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2da328cfb892cfa821bdad4cad6ab6d9ea1">API_MODE_NEW_API_NO_REF_COUNT</a> = 2, <span class="comment">/* new method, without reference counting */</span>
<a name="l00066"></a>00066 };
<a name="l00067"></a>00067
<a name="l00068"></a><a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">00068</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">api_mode</a> = <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2dab844a3f0eaa875df057068f0367489b1">API_MODE_OLD</a>;
<a name="l00069"></a>00069
<a name="l00070"></a><a class="code" href="demuxing__decoding_8c.html#af8c0388188ed14c6585580b04d960a2c">00070</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#af8c0388188ed14c6585580b04d960a2c">decode_packet</a>(<span class="keywordtype">int</span> *got_frame, <span class="keywordtype">int</span> cached)
<a name="l00071"></a>00071 {
<a name="l00072"></a>00072 <span class="keywordtype">int</span> ret = 0;
<a name="l00073"></a>00073 <span class="keywordtype">int</span> decoded = pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>;
<a name="l00074"></a>00074
<a name="l00075"></a>00075 *got_frame = 0;
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="keywordflow">if</span> (pkt.<a class="code" href="structAVPacket.html#a0d1cb9b5a32b00fb6edc81ea3aae2a49">stream_index</a> == <a class="code" href="demuxing__decoding_8c.html#af35f69f407b98b5244f837e25813bc11">video_stream_idx</a>) {
<a name="l00078"></a>00078 <span class="comment">/* decode video frame */</span>
<a name="l00079"></a>00079 ret = <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>(video_dec_ctx, frame, got_frame, &pkt);
<a name="l00080"></a>00080 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00081"></a>00081 fprintf(stderr, <span class="stringliteral">"Error decoding video frame (%s)\n"</span>, <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));
<a name="l00082"></a>00082 <span class="keywordflow">return</span> ret;
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="keywordflow">if</span> (*got_frame) {
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="keywordflow">if</span> (frame-><a class="code" href="structAVFrame.html#a1e71ce60cedd5f3b6811714a9f7f9e0a" title="width and height of the video frame">width</a> != <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a> || frame-><a class="code" href="structAVFrame.html#a3f89733f429c98ba5bc64373fb0a3f13">height</a> != <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a> ||
<a name="l00088"></a>00088 frame-><a class="code" href="structAVFrame.html#aed14fa772ce46881020fd1545c86432c" title="format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...">format</a> != <a class="code" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a>) {
<a name="l00089"></a>00089 <span class="comment">/* To handle this change, one could call av_image_alloc again and</span>
<a name="l00090"></a>00090 <span class="comment"> * decode the following frames into another rawvideo file. */</span>
<a name="l00091"></a>00091 fprintf(stderr, <span class="stringliteral">"Error: Width, height and pixel format have to be "</span>
<a name="l00092"></a>00092 <span class="stringliteral">"constant in a rawvideo file, but the width, height or "</span>
<a name="l00093"></a>00093 <span class="stringliteral">"pixel format of the input video changed:\n"</span>
<a name="l00094"></a>00094 <span class="stringliteral">"old: width = %d, height = %d, format = %s\n"</span>
<a name="l00095"></a>00095 <span class="stringliteral">"new: width = %d, height = %d, format = %s\n"</span>,
<a name="l00096"></a>00096 <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a>, <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a>, <a class="code" href="pixdesc_8h.html#ab92e2a8a9b58c982560c49df9f01e47e" title="Return the short name for a pixel format, NULL in case pix_fmt is unknown.">av_get_pix_fmt_name</a>(<a class="code" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a>),
<a name="l00097"></a>00097 frame-><a class="code" href="structAVFrame.html#a1e71ce60cedd5f3b6811714a9f7f9e0a" title="width and height of the video frame">width</a>, frame-><a class="code" href="structAVFrame.html#a3f89733f429c98ba5bc64373fb0a3f13">height</a>,
<a name="l00098"></a>00098 <a class="code" href="pixdesc_8h.html#ab92e2a8a9b58c982560c49df9f01e47e" title="Return the short name for a pixel format, NULL in case pix_fmt is unknown.">av_get_pix_fmt_name</a>(frame-><a class="code" href="structAVFrame.html#aed14fa772ce46881020fd1545c86432c" title="format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...">format</a>));
<a name="l00099"></a>00099 <span class="keywordflow">return</span> -1;
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101
<a name="l00102"></a>00102 printf(<span class="stringliteral">"video_frame%s n:%d coded_n:%d pts:%s\n"</span>,
<a name="l00103"></a>00103 cached ? <span class="stringliteral">"(cached)"</span> : <span class="stringliteral">""</span>,
<a name="l00104"></a>00104 <a class="code" href="demuxing__decoding_8c.html#ac9f496a4d3575928c5b94568bbedd753">video_frame_count</a>++, frame-><a class="code" href="structAVFrame.html#a02ca9bb7f500d3d850f8736f3cb29c6c" title="picture number in bitstream order">coded_picture_number</a>,
<a name="l00105"></a>00105 <a class="code" href="timestamp_8h.html#ad344b91ede6b86fc0a530611293f42da" title="Convenience macro, the return value should be used only directly in function arguments but never stan...">av_ts2timestr</a>(frame-><a class="code" href="structAVFrame.html#a0452833e3ab6ddd7acbf82817a7818a4" title="Presentation timestamp in time_base units (time when frame should be shown to user).">pts</a>, &video_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="l00106"></a>00106
<a name="l00107"></a>00107 <span class="comment">/* copy decoded frame to destination buffer:</span>
<a name="l00108"></a>00108 <span class="comment"> * this is required since rawvideo expects non aligned data */</span>
<a name="l00109"></a>00109 <a class="code" href="group__lavu__picture.html#ga6b5a267e202daadf81cbde6584055d1e" title="Copy image in src_data to dst_data.">av_image_copy</a>(<a class="code" href="demuxing__decoding_8c.html#a0b39e94f88658412ecadb5e2116baccc">video_dst_data</a>, <a class="code" href="demuxing__decoding_8c.html#a8dbcd4dc85b9345bde18395026d0ffe4">video_dst_linesize</a>,
<a name="l00110"></a>00110 (<span class="keyword">const</span> uint8_t **)(frame-><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992" title="pointer to the picture/channel planes.">data</a>), frame-><a class="code" href="structAVFrame.html#aa52bfc6605f6a3059a0c3226cc0f6567" title="For video, size in bytes of each picture line.">linesize</a>,
<a name="l00111"></a>00111 <a class="code" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a>, <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a>, <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a>);
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="comment">/* write to rawvideo file */</span>
<a name="l00114"></a>00114 fwrite(<a class="code" href="demuxing__decoding_8c.html#a0b39e94f88658412ecadb5e2116baccc">video_dst_data</a>[0], 1, <a class="code" href="demuxing__decoding_8c.html#a849609cb135f2d344ff03e99610b43df">video_dst_bufsize</a>, <a class="code" href="demuxing__decoding_8c.html#ac3ad9da7180c9a9baa85e968eb6937e3">video_dst_file</a>);
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (pkt.<a class="code" href="structAVPacket.html#a0d1cb9b5a32b00fb6edc81ea3aae2a49">stream_index</a> == <a class="code" href="demuxing__decoding_8c.html#a16cd83c72f483b9fa2844c5516452798">audio_stream_idx</a>) {
<a name="l00117"></a>00117 <span class="comment">/* decode audio frame */</span>
<a name="l00118"></a>00118 ret = <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>(<a class="code" href="demuxing__decoding_8c.html#adecce4fda9b9d4fc0d6713d461755cfd">audio_dec_ctx</a>, frame, got_frame, &pkt);
<a name="l00119"></a>00119 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00120"></a>00120 fprintf(stderr, <span class="stringliteral">"Error decoding audio frame (%s)\n"</span>, <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));
<a name="l00121"></a>00121 <span class="keywordflow">return</span> ret;
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123 <span class="comment">/* Some audio decoders decode only part of the packet, and have to be</span>
<a name="l00124"></a>00124 <span class="comment"> * called again with the remainder of the packet data.</span>
<a name="l00125"></a>00125 <span class="comment"> * Sample: fate-suite/lossless-audio/luckynight-partial.shn</span>
<a name="l00126"></a>00126 <span class="comment"> * Also, some decoders might over-read the packet. */</span>
<a name="l00127"></a>00127 decoded = <a class="code" href="common_8h.html#a0f84cbd7fd810cd678157c98cbfad4b0">FFMIN</a>(ret, pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>);
<a name="l00128"></a>00128
<a name="l00129"></a>00129 <span class="keywordflow">if</span> (*got_frame) {
<a name="l00130"></a>00130 <span class="keywordtype">size_t</span> unpadded_linesize = frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a> * <a class="code" href="group__lavu__sampfmts.html#ga0c3c218e1dd570ad4917c69a35a6c77d" title="Return number of bytes per sample.">av_get_bytes_per_sample</a>(frame-><a class="code" href="structAVFrame.html#aed14fa772ce46881020fd1545c86432c" title="format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...">format</a>);
<a name="l00131"></a>00131 printf(<span class="stringliteral">"audio_frame%s n:%d nb_samples:%d pts:%s\n"</span>,
<a name="l00132"></a>00132 cached ? <span class="stringliteral">"(cached)"</span> : <span class="stringliteral">""</span>,
<a name="l00133"></a>00133 <a class="code" href="demuxing__decoding_8c.html#a48eccd48ea840bc45254f44995320463">audio_frame_count</a>++, frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea" title="number of audio samples (per channel) described by this frame">nb_samples</a>,
<a name="l00134"></a>00134 <a class="code" href="timestamp_8h.html#ad344b91ede6b86fc0a530611293f42da" title="Convenience macro, the return value should be used only directly in function arguments but never stan...">av_ts2timestr</a>(frame-><a class="code" href="structAVFrame.html#a0452833e3ab6ddd7acbf82817a7818a4" title="Presentation timestamp in time_base units (time when frame should be shown to user).">pts</a>, &<a class="code" href="demuxing__decoding_8c.html#adecce4fda9b9d4fc0d6713d461755cfd">audio_dec_ctx</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>));
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="comment">/* Write the raw audio data samples of the first plane. This works</span>
<a name="l00137"></a>00137 <span class="comment"> * fine for packed formats (e.g. AV_SAMPLE_FMT_S16). However,</span>
<a name="l00138"></a>00138 <span class="comment"> * most audio decoders output planar audio, which uses a separate</span>
<a name="l00139"></a>00139 <span class="comment"> * plane of audio samples for each channel (e.g. AV_SAMPLE_FMT_S16P).</span>
<a name="l00140"></a>00140 <span class="comment"> * In other words, this code will write only the first audio channel</span>
<a name="l00141"></a>00141 <span class="comment"> * in these cases.</span>
<a name="l00142"></a>00142 <span class="comment"> * You should use libswresample or libavfilter to convert the frame</span>
<a name="l00143"></a>00143 <span class="comment"> * to packed data. */</span>
<a name="l00144"></a>00144 fwrite(frame-><a class="code" href="structAVFrame.html#afca04d808393822625e09b5ba91c6756" title="pointers to the data planes/channels.">extended_data</a>[0], 1, unpadded_linesize, <a class="code" href="demuxing__decoding_8c.html#af0d7c67df6575ed6b3b7de4d843ed7a6">audio_dst_file</a>);
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147
<a name="l00148"></a>00148 <span class="comment">/* If we use the new API with reference counting, we own the data and need</span>
<a name="l00149"></a>00149 <span class="comment"> * to de-reference it when we don't use it anymore */</span>
<a name="l00150"></a>00150 <span class="keywordflow">if</span> (*got_frame && <a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">api_mode</a> == <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2da8a168414de8770c24226d90ba3d1f7cc">API_MODE_NEW_API_REF_COUNT</a>)
<a name="l00151"></a>00151 <a class="code" href="group__lavu__frame.html#ga0a2b687f9c1c5ed0089b01fd61227108" title="Unreference all the buffers referenced by frame and reset the frame fields.">av_frame_unref</a>(frame);
<a name="l00152"></a>00152
<a name="l00153"></a>00153 <span class="keywordflow">return</span> decoded;
<a name="l00154"></a>00154 }
<a name="l00155"></a>00155
<a name="l00156"></a><a class="code" href="demuxing__decoding_8c.html#a85e44b1a7e74c90b84b2298caefb5f73">00156</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#a85e44b1a7e74c90b84b2298caefb5f73">open_codec_context</a>(<span class="keywordtype">int</span> *stream_idx,
<a name="l00157"></a>00157 <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *fmt_ctx, <span class="keyword">enum</span> <a class="code" href="group__lavu__misc.html#ga9a84bba4713dfced21a1a56163be1f48">AVMediaType</a> type)
<a name="l00158"></a>00158 {
<a name="l00159"></a>00159 <span class="keywordtype">int</span> ret, stream_index;
<a name="l00160"></a>00160 <a class="code" href="structAVStream.html" title="Stream structure.">AVStream</a> *st;
<a name="l00161"></a>00161 <a class="code" href="structAVCodecContext.html" title="main external API structure.">AVCodecContext</a> *<a class="code" href="filtering__audio_8c.html#ac2bf6798f37e95d3d2ff2d44e4ab3c12">dec_ctx</a> = NULL;
<a name="l00162"></a>00162 <a class="code" href="structAVCodec.html" title="AVCodec.">AVCodec</a> *dec = NULL;
<a name="l00163"></a>00163 <a class="code" href="group__lavu__dict.html#ga1d7cc0833bee918994a600556410315f">AVDictionary</a> *opts = NULL;
<a name="l00164"></a>00164
<a name="l00165"></a>00165 ret = <a class="code" href="group__lavf__decoding.html#gaa6fa468c922ff5c60a6021dcac09aff9" title="Find the "best" stream in the file.">av_find_best_stream</a>(fmt_ctx, type, -1, -1, NULL, 0);
<a name="l00166"></a>00166 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00167"></a>00167 fprintf(stderr, <span class="stringliteral">"Could not find %s stream in input file '%s'\n"</span>,
<a name="l00168"></a>00168 <a class="code" href="group__lavu__misc.html#gaf21645cfa855b2caf9699d7dc7b2d08e" title="Return a string describing the media_type enum, NULL if media_type is unknown.">av_get_media_type_string</a>(type), <a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">src_filename</a>);
<a name="l00169"></a>00169 <span class="keywordflow">return</span> ret;
<a name="l00170"></a>00170 } <span class="keywordflow">else</span> {
<a name="l00171"></a>00171 stream_index = ret;
<a name="l00172"></a>00172 st = fmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[stream_index];
<a name="l00173"></a>00173
<a name="l00174"></a>00174 <span class="comment">/* find decoder for the stream */</span>
<a name="l00175"></a>00175 dec_ctx = st-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>;
<a name="l00176"></a>00176 dec = <a class="code" href="group__lavc__decoding.html#ga19a0ca553277f019dd5b0fec6e1f9dca" title="Find a registered decoder with a matching codec ID.">avcodec_find_decoder</a>(dec_ctx-><a class="code" href="structAVCodecContext.html#adc5f65d6099fd8339c1580c091777223">codec_id</a>);
<a name="l00177"></a>00177 <span class="keywordflow">if</span> (!dec) {
<a name="l00178"></a>00178 fprintf(stderr, <span class="stringliteral">"Failed to find %s codec\n"</span>,
<a name="l00179"></a>00179 <a class="code" href="group__lavu__misc.html#gaf21645cfa855b2caf9699d7dc7b2d08e" title="Return a string describing the media_type enum, NULL if media_type is unknown.">av_get_media_type_string</a>(type));
<a name="l00180"></a>00180 <span class="keywordflow">return</span> <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(EINVAL);
<a name="l00181"></a>00181 }
<a name="l00182"></a>00182
<a name="l00183"></a>00183 <span class="comment">/* Init the decoders, with or without reference counting */</span>
<a name="l00184"></a>00184 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">api_mode</a> == <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2da8a168414de8770c24226d90ba3d1f7cc">API_MODE_NEW_API_REF_COUNT</a>)
<a name="l00185"></a>00185 <a class="code" href="group__lavu__dict.html#ga8d9c2de72b310cef8e6a28c9cd3acbbe" title="Set the given entry in *pm, overwriting an existing entry.">av_dict_set</a>(&opts, <span class="stringliteral">"refcounted_frames"</span>, <span class="stringliteral">"1"</span>, 0);
<a name="l00186"></a>00186 <span class="keywordflow">if</span> ((ret = <a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d" title="Initialize the AVCodecContext to use the given AVCodec.">avcodec_open2</a>(dec_ctx, dec, &opts)) < 0) {
<a name="l00187"></a>00187 fprintf(stderr, <span class="stringliteral">"Failed to open %s codec\n"</span>,
<a name="l00188"></a>00188 <a class="code" href="group__lavu__misc.html#gaf21645cfa855b2caf9699d7dc7b2d08e" title="Return a string describing the media_type enum, NULL if media_type is unknown.">av_get_media_type_string</a>(type));
<a name="l00189"></a>00189 <span class="keywordflow">return</span> ret;
<a name="l00190"></a>00190 }
<a name="l00191"></a>00191 *stream_idx = stream_index;
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193
<a name="l00194"></a>00194 <span class="keywordflow">return</span> 0;
<a name="l00195"></a>00195 }
<a name="l00196"></a>00196
<a name="l00197"></a><a class="code" href="demuxing__decoding_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89">00197</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89">get_format_from_sample_fmt</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> **fmt,
<a name="l00198"></a>00198 <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> sample_fmt)
<a name="l00199"></a>00199 {
<a name="l00200"></a>00200 <span class="keywordtype">int</span> i;
<a name="l00201"></a>00201 <span class="keyword">struct </span>sample_fmt_entry {
<a name="l00202"></a>00202 <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> sample_fmt; <span class="keyword">const</span> <span class="keywordtype">char</span> *fmt_be, *fmt_le;
<a name="l00203"></a>00203 } sample_fmt_entries[] = {
<a name="l00204"></a>00204 { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5adf0f66f21492f8fd5db6debb8b3f932a" title="unsigned 8 bits">AV_SAMPLE_FMT_U8</a>, <span class="stringliteral">"u8"</span>, <span class="stringliteral">"u8"</span> },
<a name="l00205"></a>00205 { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5aea6132df57aebc3f76e10665395c46af" title="signed 16 bits">AV_SAMPLE_FMT_S16</a>, <span class="stringliteral">"s16be"</span>, <span class="stringliteral">"s16le"</span> },
<a name="l00206"></a>00206 { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ab7ae6bb6718c07cd316778783a57a63b" title="signed 32 bits">AV_SAMPLE_FMT_S32</a>, <span class="stringliteral">"s32be"</span>, <span class="stringliteral">"s32le"</span> },
<a name="l00207"></a>00207 { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5a5251d62cc3c7f18e56bc8e0c48a27903" title="float">AV_SAMPLE_FMT_FLT</a>, <span class="stringliteral">"f32be"</span>, <span class="stringliteral">"f32le"</span> },
<a name="l00208"></a>00208 { <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ae35a2a6a7593723d9fe4bcefb2876606" title="double">AV_SAMPLE_FMT_DBL</a>, <span class="stringliteral">"f64be"</span>, <span class="stringliteral">"f64le"</span> },
<a name="l00209"></a>00209 };
<a name="l00210"></a>00210 *fmt = NULL;
<a name="l00211"></a>00211
<a name="l00212"></a>00212 <span class="keywordflow">for</span> (i = 0; i < <a class="code" href="common_8h.html#a3508a98d3ee7e2c9a4841fe264cf70f7">FF_ARRAY_ELEMS</a>(sample_fmt_entries); i++) {
<a name="l00213"></a>00213 <span class="keyword">struct </span>sample_fmt_entry *entry = &sample_fmt_entries[i];
<a name="l00214"></a>00214 <span class="keywordflow">if</span> (sample_fmt == entry->sample_fmt) {
<a name="l00215"></a>00215 *fmt = <a class="code" href="common_8h.html#a309bdca20f6a78431379fc69442d98ea">AV_NE</a>(entry->fmt_be, entry->fmt_le);
<a name="l00216"></a>00216 <span class="keywordflow">return</span> 0;
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218 }
<a name="l00219"></a>00219
<a name="l00220"></a>00220 fprintf(stderr,
<a name="l00221"></a>00221 <span class="stringliteral">"sample format %s is not supported as output format\n"</span>,
<a name="l00222"></a>00222 <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>(sample_fmt));
<a name="l00223"></a>00223 <span class="keywordflow">return</span> -1;
<a name="l00224"></a>00224 }
<a name="l00225"></a>00225
<a name="l00226"></a><a class="code" href="demuxing__decoding_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">00226</a> <span class="keywordtype">int</span> <a class="code" href="avio__list__dir_8c.html#a0ddf1224851353fc92bfbff6f499fa97">main</a> (<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
<a name="l00227"></a>00227 {
<a name="l00228"></a>00228 <span class="keywordtype">int</span> ret = 0, got_frame;
<a name="l00229"></a>00229
<a name="l00230"></a>00230 <span class="keywordflow">if</span> (argc != 4 && argc != 5) {
<a name="l00231"></a>00231 fprintf(stderr, <span class="stringliteral">"usage: %s [-refcount=<old|new_norefcount|new_refcount>] "</span>
<a name="l00232"></a>00232 <span class="stringliteral">"input_file video_output_file audio_output_file\n"</span>
<a name="l00233"></a>00233 <span class="stringliteral">"API example program to show how to read frames from an input file.\n"</span>
<a name="l00234"></a>00234 <span class="stringliteral">"This program reads frames from a file, decodes them, and writes decoded\n"</span>
<a name="l00235"></a>00235 <span class="stringliteral">"video frames to a rawvideo file named video_output_file, and decoded\n"</span>
<a name="l00236"></a>00236 <span class="stringliteral">"audio frames to a rawaudio file named audio_output_file.\n\n"</span>
<a name="l00237"></a>00237 <span class="stringliteral">"If the -refcount option is specified, the program use the\n"</span>
<a name="l00238"></a>00238 <span class="stringliteral">"reference counting frame system which allows keeping a copy of\n"</span>
<a name="l00239"></a>00239 <span class="stringliteral">"the data for longer than one decode call. If unset, it's using\n"</span>
<a name="l00240"></a>00240 <span class="stringliteral">"the classic old method.\n"</span>
<a name="l00241"></a>00241 <span class="stringliteral">"\n"</span>, argv[0]);
<a name="l00242"></a>00242 exit(1);
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244 <span class="keywordflow">if</span> (argc == 5) {
<a name="l00245"></a>00245 <span class="keyword">const</span> <span class="keywordtype">char</span> *mode = argv[1] + strlen(<span class="stringliteral">"-refcount="</span>);
<a name="l00246"></a>00246 <span class="keywordflow">if</span> (!strcmp(mode, <span class="stringliteral">"old"</span>)) <a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">api_mode</a> = <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2dab844a3f0eaa875df057068f0367489b1">API_MODE_OLD</a>;
<a name="l00247"></a>00247 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strcmp(mode, <span class="stringliteral">"new_norefcount"</span>)) <a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">api_mode</a> = <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2da328cfb892cfa821bdad4cad6ab6d9ea1">API_MODE_NEW_API_NO_REF_COUNT</a>;
<a name="l00248"></a>00248 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strcmp(mode, <span class="stringliteral">"new_refcount"</span>)) <a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">api_mode</a> = <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2da8a168414de8770c24226d90ba3d1f7cc">API_MODE_NEW_API_REF_COUNT</a>;
<a name="l00249"></a>00249 <span class="keywordflow">else</span> {
<a name="l00250"></a>00250 fprintf(stderr, <span class="stringliteral">"unknow mode '%s'\n"</span>, mode);
<a name="l00251"></a>00251 exit(1);
<a name="l00252"></a>00252 }
<a name="l00253"></a>00253 argv++;
<a name="l00254"></a>00254 }
<a name="l00255"></a>00255 <a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">src_filename</a> = argv[1];
<a name="l00256"></a>00256 <a class="code" href="demuxing__decoding_8c.html#a780830fc3afc836feb64d80eef4185b5">video_dst_filename</a> = argv[2];
<a name="l00257"></a>00257 <a class="code" href="demuxing__decoding_8c.html#a9f79f9440c018d4eb8448d849f35f467">audio_dst_filename</a> = argv[3];
<a name="l00258"></a>00258
<a name="l00259"></a>00259 <span class="comment">/* register all formats and codecs */</span>
<a name="l00260"></a>00260 <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="l00261"></a>00261
<a name="l00262"></a>00262 <span class="comment">/* open input file, and allocate format context */</span>
<a name="l00263"></a>00263 <span class="keywordflow">if</span> (<a class="code" href="group__lavf__decoding.html#ga10a404346c646e4ab58f4ed798baca32" title="Open an input stream and read the header.">avformat_open_input</a>(&fmt_ctx, <a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">src_filename</a>, NULL, NULL) < 0) {
<a name="l00264"></a>00264 fprintf(stderr, <span class="stringliteral">"Could not open source file %s\n"</span>, <a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">src_filename</a>);
<a name="l00265"></a>00265 exit(1);
<a name="l00266"></a>00266 }
<a name="l00267"></a>00267
<a name="l00268"></a>00268 <span class="comment">/* retrieve stream information */</span>
<a name="l00269"></a>00269 <span class="keywordflow">if</span> (<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>(fmt_ctx, NULL) < 0) {
<a name="l00270"></a>00270 fprintf(stderr, <span class="stringliteral">"Could not find stream information\n"</span>);
<a name="l00271"></a>00271 exit(1);
<a name="l00272"></a>00272 }
<a name="l00273"></a>00273
<a name="l00274"></a>00274 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#a85e44b1a7e74c90b84b2298caefb5f73">open_codec_context</a>(&<a class="code" href="demuxing__decoding_8c.html#af35f69f407b98b5244f837e25813bc11">video_stream_idx</a>, fmt_ctx, <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48ac1a46f59be5c6c2d3412ab172d6b8cf5">AVMEDIA_TYPE_VIDEO</a>) >= 0) {
<a name="l00275"></a>00275 video_stream = fmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[<a class="code" href="demuxing__decoding_8c.html#af35f69f407b98b5244f837e25813bc11">video_stream_idx</a>];
<a name="l00276"></a>00276 video_dec_ctx = video_stream-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>;
<a name="l00277"></a>00277
<a name="l00278"></a>00278 <a class="code" href="demuxing__decoding_8c.html#ac3ad9da7180c9a9baa85e968eb6937e3">video_dst_file</a> = fopen(<a class="code" href="demuxing__decoding_8c.html#a780830fc3afc836feb64d80eef4185b5">video_dst_filename</a>, <span class="stringliteral">"wb"</span>);
<a name="l00279"></a>00279 <span class="keywordflow">if</span> (!<a class="code" href="demuxing__decoding_8c.html#ac3ad9da7180c9a9baa85e968eb6937e3">video_dst_file</a>) {
<a name="l00280"></a>00280 fprintf(stderr, <span class="stringliteral">"Could not open destination file %s\n"</span>, <a class="code" href="demuxing__decoding_8c.html#a780830fc3afc836feb64d80eef4185b5">video_dst_filename</a>);
<a name="l00281"></a>00281 ret = 1;
<a name="l00282"></a>00282 <span class="keywordflow">goto</span> end;
<a name="l00283"></a>00283 }
<a name="l00284"></a>00284
<a name="l00285"></a>00285 <span class="comment">/* allocate image where the decoded image will be put */</span>
<a name="l00286"></a>00286 <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a> = video_dec_ctx-><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956" title="picture width / height.">width</a>;
<a name="l00287"></a>00287 <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a> = video_dec_ctx-><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a>;
<a name="l00288"></a>00288 <a class="code" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a> = video_dec_ctx-><a class="code" href="structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2" title="Pixel format, see AV_PIX_FMT_xxx.">pix_fmt</a>;
<a name="l00289"></a>00289 ret = <a class="code" href="group__lavu__picture.html#ga841e0a89a642e24141af1918a2c10448" title="Allocate an image with size w and h and pixel format pix_fmt, and fill pointers and linesizes accordi...">av_image_alloc</a>(<a class="code" href="demuxing__decoding_8c.html#a0b39e94f88658412ecadb5e2116baccc">video_dst_data</a>, <a class="code" href="demuxing__decoding_8c.html#a8dbcd4dc85b9345bde18395026d0ffe4">video_dst_linesize</a>,
<a name="l00290"></a>00290 <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a>, <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a>, <a class="code" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a>, 1);
<a name="l00291"></a>00291 <span class="keywordflow">if</span> (ret < 0) {
<a name="l00292"></a>00292 fprintf(stderr, <span class="stringliteral">"Could not allocate raw video buffer\n"</span>);
<a name="l00293"></a>00293 <span class="keywordflow">goto</span> end;
<a name="l00294"></a>00294 }
<a name="l00295"></a>00295 <a class="code" href="demuxing__decoding_8c.html#a849609cb135f2d344ff03e99610b43df">video_dst_bufsize</a> = ret;
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297
<a name="l00298"></a>00298 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#a85e44b1a7e74c90b84b2298caefb5f73">open_codec_context</a>(&<a class="code" href="demuxing__decoding_8c.html#a16cd83c72f483b9fa2844c5516452798">audio_stream_idx</a>, fmt_ctx, <a class="code" href="group__lavu__misc.html#gga9a84bba4713dfced21a1a56163be1f48a7b4e33b8f30ac94d34ce8d9f7c33927a">AVMEDIA_TYPE_AUDIO</a>) >= 0) {
<a name="l00299"></a>00299 <a class="code" href="demuxing__decoding_8c.html#ab269038fe8cd6f8fa4ccec9eaf939345">audio_stream</a> = fmt_ctx-><a class="code" href="structAVFormatContext.html#acfefb6b6cf21e87a0dcbd1a547ba2348" title="A list of all streams in the file.">streams</a>[<a class="code" href="demuxing__decoding_8c.html#a16cd83c72f483b9fa2844c5516452798">audio_stream_idx</a>];
<a name="l00300"></a>00300 <a class="code" href="demuxing__decoding_8c.html#adecce4fda9b9d4fc0d6713d461755cfd">audio_dec_ctx</a> = <a class="code" href="demuxing__decoding_8c.html#ab269038fe8cd6f8fa4ccec9eaf939345">audio_stream</a>-><a class="code" href="structAVStream.html#a56f20051fb99339cc588cd3a07ab8c96" title="Codec context associated with this stream.">codec</a>;
<a name="l00301"></a>00301 <a class="code" href="demuxing__decoding_8c.html#af0d7c67df6575ed6b3b7de4d843ed7a6">audio_dst_file</a> = fopen(<a class="code" href="demuxing__decoding_8c.html#a9f79f9440c018d4eb8448d849f35f467">audio_dst_filename</a>, <span class="stringliteral">"wb"</span>);
<a name="l00302"></a>00302 <span class="keywordflow">if</span> (!<a class="code" href="demuxing__decoding_8c.html#af0d7c67df6575ed6b3b7de4d843ed7a6">audio_dst_file</a>) {
<a name="l00303"></a>00303 fprintf(stderr, <span class="stringliteral">"Could not open destination file %s\n"</span>, <a class="code" href="demuxing__decoding_8c.html#a9f79f9440c018d4eb8448d849f35f467">audio_dst_filename</a>);
<a name="l00304"></a>00304 ret = 1;
<a name="l00305"></a>00305 <span class="keywordflow">goto</span> end;
<a name="l00306"></a>00306 }
<a name="l00307"></a>00307 }
<a name="l00308"></a>00308
<a name="l00309"></a>00309 <span class="comment">/* dump input information to stderr */</span>
<a name="l00310"></a>00310 <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>(fmt_ctx, 0, <a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">src_filename</a>, 0);
<a name="l00311"></a>00311
<a name="l00312"></a>00312 <span class="keywordflow">if</span> (!<a class="code" href="demuxing__decoding_8c.html#ab269038fe8cd6f8fa4ccec9eaf939345">audio_stream</a> && !video_stream) {
<a name="l00313"></a>00313 fprintf(stderr, <span class="stringliteral">"Could not find audio or video stream in the input, aborting\n"</span>);
<a name="l00314"></a>00314 ret = 1;
<a name="l00315"></a>00315 <span class="keywordflow">goto</span> end;
<a name="l00316"></a>00316 }
<a name="l00317"></a>00317
<a name="l00318"></a>00318 <span class="comment">/* When using the new API, you need to use the libavutil/frame.h API, while</span>
<a name="l00319"></a>00319 <span class="comment"> * the classic frame management is available in libavcodec */</span>
<a name="l00320"></a>00320 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">api_mode</a> == <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2dab844a3f0eaa875df057068f0367489b1">API_MODE_OLD</a>)
<a name="l00321"></a>00321 frame = avcodec_alloc_frame();
<a name="l00322"></a>00322 <span class="keywordflow">else</span>
<a name="l00323"></a>00323 frame = <a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f" title="Allocate an AVFrame and set its fields to default values.">av_frame_alloc</a>();
<a name="l00324"></a>00324 <span class="keywordflow">if</span> (!frame) {
<a name="l00325"></a>00325 fprintf(stderr, <span class="stringliteral">"Could not allocate frame\n"</span>);
<a name="l00326"></a>00326 ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<a name="l00327"></a>00327 <span class="keywordflow">goto</span> end;
<a name="l00328"></a>00328 }
<a name="l00329"></a>00329
<a name="l00330"></a>00330 <span class="comment">/* initialize packet, set data to NULL, let the demuxer fill it */</span>
<a name="l00331"></a>00331 <a class="code" href="group__lavc__packet.html#gac9cb9756175b96e7441575803757fb73" title="Initialize optional fields of a packet with default values.">av_init_packet</a>(&pkt);
<a name="l00332"></a>00332 pkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL;
<a name="l00333"></a>00333 pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;
<a name="l00334"></a>00334
<a name="l00335"></a>00335 <span class="keywordflow">if</span> (video_stream)
<a name="l00336"></a>00336 printf(<span class="stringliteral">"Demuxing video from file '%s' into '%s'\n"</span>, <a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">src_filename</a>, <a class="code" href="demuxing__decoding_8c.html#a780830fc3afc836feb64d80eef4185b5">video_dst_filename</a>);
<a name="l00337"></a>00337 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#ab269038fe8cd6f8fa4ccec9eaf939345">audio_stream</a>)
<a name="l00338"></a>00338 printf(<span class="stringliteral">"Demuxing audio from file '%s' into '%s'\n"</span>, <a class="code" href="demuxing__decoding_8c.html#ad3e56268ab4ce7a25e7a17c2e088a3c1">src_filename</a>, <a class="code" href="demuxing__decoding_8c.html#a9f79f9440c018d4eb8448d849f35f467">audio_dst_filename</a>);
<a name="l00339"></a>00339
<a name="l00340"></a>00340 <span class="comment">/* read frames from the file */</span>
<a name="l00341"></a>00341 <span class="keywordflow">while</span> (<a class="code" href="group__lavf__decoding.html#ga4fdb3084415a82e3810de6ee60e46a61" title="Return the next frame of a stream.">av_read_frame</a>(fmt_ctx, &pkt) >= 0) {
<a name="l00342"></a>00342 <a class="code" href="structAVPacket.html" title="This structure stores compressed data.">AVPacket</a> orig_pkt = <a class="code" href="demuxing__decoding_8c.html#a3d4c6562f0b27cf0cacbbea5c038c090">pkt</a>;
<a name="l00343"></a>00343 <span class="keywordflow">do</span> {
<a name="l00344"></a>00344 ret = <a class="code" href="demuxing__decoding_8c.html#af8c0388188ed14c6585580b04d960a2c">decode_packet</a>(&got_frame, 0);
<a name="l00345"></a>00345 <span class="keywordflow">if</span> (ret < 0)
<a name="l00346"></a>00346 <span class="keywordflow">break</span>;
<a name="l00347"></a>00347 pkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> += ret;
<a name="l00348"></a>00348 pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> -= ret;
<a name="l00349"></a>00349 } <span class="keywordflow">while</span> (pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> > 0);
<a name="l00350"></a>00350 <a class="code" href="group__lavc__packet.html#gae65881462e78f98b268f34661d921ee0" title="Free a packet.">av_free_packet</a>(&orig_pkt);
<a name="l00351"></a>00351 }
<a name="l00352"></a>00352
<a name="l00353"></a>00353 <span class="comment">/* flush cached frames */</span>
<a name="l00354"></a>00354 pkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL;
<a name="l00355"></a>00355 pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;
<a name="l00356"></a>00356 <span class="keywordflow">do</span> {
<a name="l00357"></a>00357 <a class="code" href="demuxing__decoding_8c.html#af8c0388188ed14c6585580b04d960a2c">decode_packet</a>(&got_frame, 1);
<a name="l00358"></a>00358 } <span class="keywordflow">while</span> (got_frame);
<a name="l00359"></a>00359
<a name="l00360"></a>00360 printf(<span class="stringliteral">"Demuxing succeeded.\n"</span>);
<a name="l00361"></a>00361
<a name="l00362"></a>00362 <span class="keywordflow">if</span> (video_stream) {
<a name="l00363"></a>00363 printf(<span class="stringliteral">"Play the output video file with the command:\n"</span>
<a name="l00364"></a>00364 <span class="stringliteral">"ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n"</span>,
<a name="l00365"></a>00365 <a class="code" href="pixdesc_8h.html#ab92e2a8a9b58c982560c49df9f01e47e" title="Return the short name for a pixel format, NULL in case pix_fmt is unknown.">av_get_pix_fmt_name</a>(<a class="code" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a>), <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a>, <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a>,
<a name="l00366"></a>00366 <a class="code" href="demuxing__decoding_8c.html#a780830fc3afc836feb64d80eef4185b5">video_dst_filename</a>);
<a name="l00367"></a>00367 }
<a name="l00368"></a>00368
<a name="l00369"></a>00369 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#ab269038fe8cd6f8fa4ccec9eaf939345">audio_stream</a>) {
<a name="l00370"></a>00370 <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> sfmt = <a class="code" href="demuxing__decoding_8c.html#adecce4fda9b9d4fc0d6713d461755cfd">audio_dec_ctx</a>-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45" title="audio sample format">sample_fmt</a>;
<a name="l00371"></a>00371 <span class="keywordtype">int</span> n_channels = <a class="code" href="demuxing__decoding_8c.html#adecce4fda9b9d4fc0d6713d461755cfd">audio_dec_ctx</a>-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49" title="number of audio channels">channels</a>;
<a name="l00372"></a>00372 <span class="keyword">const</span> <span class="keywordtype">char</span> *fmt;
<a name="l00373"></a>00373
<a name="l00374"></a>00374 <span class="keywordflow">if</span> (<a class="code" href="group__lavu__sampfmts.html#ga06ba8a64dc4382c422789a5d0b6bf592" title="Check if the sample format is planar.">av_sample_fmt_is_planar</a>(sfmt)) {
<a name="l00375"></a>00375 <span class="keyword">const</span> <span class="keywordtype">char</span> *packed = <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>(sfmt);
<a name="l00376"></a>00376 printf(<span class="stringliteral">"Warning: the sample format the decoder produced is planar "</span>
<a name="l00377"></a>00377 <span class="stringliteral">"(%s). This example will output the first channel only.\n"</span>,
<a name="l00378"></a>00378 packed ? packed : <span class="stringliteral">"?"</span>);
<a name="l00379"></a>00379 sfmt = <a class="code" href="group__lavu__sampfmts.html#ga7817ec0eff4dc6fc0962f31e6d138bca" title="Get the packed alternative form of the given sample format.">av_get_packed_sample_fmt</a>(sfmt);
<a name="l00380"></a>00380 n_channels = 1;
<a name="l00381"></a>00381 }
<a name="l00382"></a>00382
<a name="l00383"></a>00383 <span class="keywordflow">if</span> ((ret = <a class="code" href="demuxing__decoding_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89">get_format_from_sample_fmt</a>(&fmt, sfmt)) < 0)
<a name="l00384"></a>00384 <span class="keywordflow">goto</span> end;
<a name="l00385"></a>00385
<a name="l00386"></a>00386 printf(<span class="stringliteral">"Play the output audio file with the command:\n"</span>
<a name="l00387"></a>00387 <span class="stringliteral">"ffplay -f %s -ac %d -ar %d %s\n"</span>,
<a name="l00388"></a>00388 fmt, n_channels, <a class="code" href="demuxing__decoding_8c.html#adecce4fda9b9d4fc0d6713d461755cfd">audio_dec_ctx</a>-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0" title="samples per second">sample_rate</a>,
<a name="l00389"></a>00389 <a class="code" href="demuxing__decoding_8c.html#a9f79f9440c018d4eb8448d849f35f467">audio_dst_filename</a>);
<a name="l00390"></a>00390 }
<a name="l00391"></a>00391
<a name="l00392"></a>00392 end:
<a name="l00393"></a>00393 <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>(video_dec_ctx);
<a name="l00394"></a>00394 <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>(<a class="code" href="demuxing__decoding_8c.html#adecce4fda9b9d4fc0d6713d461755cfd">audio_dec_ctx</a>);
<a name="l00395"></a>00395 <a class="code" href="group__lavf__decoding.html#gae804b99aec044690162b8b9b110236a4" title="Close an opened input AVFormatContext.">avformat_close_input</a>(&fmt_ctx);
<a name="l00396"></a>00396 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#ac3ad9da7180c9a9baa85e968eb6937e3">video_dst_file</a>)
<a name="l00397"></a>00397 fclose(<a class="code" href="demuxing__decoding_8c.html#ac3ad9da7180c9a9baa85e968eb6937e3">video_dst_file</a>);
<a name="l00398"></a>00398 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#af0d7c67df6575ed6b3b7de4d843ed7a6">audio_dst_file</a>)
<a name="l00399"></a>00399 fclose(<a class="code" href="demuxing__decoding_8c.html#af0d7c67df6575ed6b3b7de4d843ed7a6">audio_dst_file</a>);
<a name="l00400"></a>00400 <span class="keywordflow">if</span> (<a class="code" href="demuxing__decoding_8c.html#a4bb7a82d583b93cb9e28b93dda64ff14">api_mode</a> == <a class="code" href="demuxing__decoding_8c.html#a0411cd49bb5b71852cecd93bcbf0ca2dab844a3f0eaa875df057068f0367489b1">API_MODE_OLD</a>)
<a name="l00401"></a>00401 avcodec_free_frame(&frame);
<a name="l00402"></a>00402 <span class="keywordflow">else</span>
<a name="l00403"></a>00403 <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc" title="Free the frame and any dynamically allocated objects in it, e.g.">av_frame_free</a>(&frame);
<a name="l00404"></a>00404 <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>(<a class="code" href="demuxing__decoding_8c.html#a0b39e94f88658412ecadb5e2116baccc">video_dst_data</a>[0]);
<a name="l00405"></a>00405
<a name="l00406"></a>00406 <span class="keywordflow">return</span> ret < 0;
<a name="l00407"></a>00407 }
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