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 <span id="projectnumber">3.0.2</span>
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<div class="title">decoding_encoding.c</div> </div>
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<p>Note that libavcodec only handles codecs (mpeg, mpeg4, etc...), not file formats (avi, vob, mp4, mov, mkv, mxf, flv, mpegts, mpegps, etc...). See library 'libavformat' for the format handling</p>
<div class="fragment"><div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Copyright (c) 2001 Fabrice Bellard</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span></div>
<div class="line"><span class="comment"> * of this software and associated documentation files (the "Software"), to deal</span></div>
<div class="line"><span class="comment"> * in the Software without restriction, including without limitation the rights</span></div>
<div class="line"><span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span></div>
<div class="line"><span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span></div>
<div class="line"><span class="comment"> * furnished to do so, subject to the following conditions:</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * The above copyright notice and this permission notice shall be included in</span></div>
<div class="line"><span class="comment"> * all copies or substantial portions of the Software.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div>
<div class="line"><span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span></div>
<div class="line"><span class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
<div class="line"><span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span></div>
<div class="line"><span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span></div>
<div class="line"><span class="comment"> * THE SOFTWARE.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment">/**</span></div>
<div class="line"><span class="comment"> * @file</span></div>
<div class="line"><span class="comment"> * libavcodec API use example.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * @example decoding_encoding.c</span></div>
<div class="line"><span class="comment"> * Note that libavcodec only handles codecs (mpeg, mpeg4, etc...),</span></div>
<div class="line"><span class="comment"> * not file formats (avi, vob, mp4, mov, mkv, mxf, flv, mpegts, mpegps, etc...). See library 'libavformat' for the</span></div>
<div class="line"><span class="comment"> * format handling</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <math.h></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="opt_8h.html">libavutil/opt.h</a>></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="avcodec_8h.html">libavcodec/avcodec.h</a>></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="channel__layout_8h.html">libavutil/channel_layout.h</a>></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="common_8h.html">libavutil/common.h</a>></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="imgutils_8h.html">libavutil/imgutils.h</a>></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="mathematics_8h.html">libavutil/mathematics.h</a>></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="samplefmt_8h.html">libavutil/samplefmt.h</a>></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#define INBUF_SIZE 4096</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#define AUDIO_INBUF_SIZE 20480</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#define AUDIO_REFILL_THRESH 4096</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><span class="comment">/* check that a given sample format is supported by the encoder */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a0"></a><a class="code" href="decoding__encoding_8c.html#a93df45821682fdbabbc0092abff0bd61">check_sample_fmt</a>(<a name="_a1"></a><a class="code" href="structAVCodec.html">AVCodec</a> *codec, <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> sample_fmt)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> <span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> *p = codec-><a name="a2"></a><a class="code" href="structAVCodec.html#aac19f4c45370f715412ad5c7b78daacf">sample_fmts</a>;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">while</span> (*p != <a name="a3"></a><a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ac5d4bb5b0fb0dc7316fb3c7a73029912">AV_SAMPLE_FMT_NONE</a>) {</div>
<div class="line"> <span class="keywordflow">if</span> (*p == sample_fmt)</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> p++;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="comment">/* just pick the highest supported samplerate */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a4"></a><a class="code" href="decoding__encoding_8c.html#a5809ff9edcce25b26466e3c806bf9854">select_sample_rate</a>(<a class="code" href="structAVCodec.html">AVCodec</a> *codec)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">int</span> *p;</div>
<div class="line"> <span class="keywordtype">int</span> best_samplerate = 0;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (!codec-><a name="a5"></a><a class="code" href="structAVCodec.html#aee7a194f1c3251958d3dabed3fa8148e">supported_samplerates</a>)</div>
<div class="line"> <span class="keywordflow">return</span> 44100;</div>
<div class="line"></div>
<div class="line"> p = codec-><a class="code" href="structAVCodec.html#aee7a194f1c3251958d3dabed3fa8148e">supported_samplerates</a>;</div>
<div class="line"> <span class="keywordflow">while</span> (*p) {</div>
<div class="line"> best_samplerate = <a name="a6"></a><a class="code" href="common_8h.html#a9960bd6780a9b16a216a57be1ee04359">FFMAX</a>(*p, best_samplerate);</div>
<div class="line"> p++;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> best_samplerate;</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="comment">/* select layout with the highest channel count */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a7"></a><a class="code" href="decoding__encoding_8c.html#ae6bb0fc8f05c78c13e9d38605038d994">select_channel_layout</a>(<a class="code" href="structAVCodec.html">AVCodec</a> *codec)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> uint64_t *p;</div>
<div class="line"> uint64_t best_ch_layout = 0;</div>
<div class="line"> <span class="keywordtype">int</span> best_nb_channels = 0;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (!codec-><a name="a8"></a><a class="code" href="structAVCodec.html#a1d4c5152626bbd1f575a3e0014cb59e7">channel_layouts</a>)</div>
<div class="line"> <span class="keywordflow">return</span> <a name="a9"></a><a class="code" href="group__channel__mask__c.html#gabc6d6651bba254cd0fa2c42a57228e65">AV_CH_LAYOUT_STEREO</a>;</div>
<div class="line"></div>
<div class="line"> p = codec-><a class="code" href="structAVCodec.html#a1d4c5152626bbd1f575a3e0014cb59e7">channel_layouts</a>;</div>
<div class="line"> <span class="keywordflow">while</span> (*p) {</div>
<div class="line"> <span class="keywordtype">int</span> nb_channels = <a name="a10"></a><a class="code" href="group__channel__mask__c.html#gac95619abeb32e4a3daa18e3ff3419380">av_get_channel_layout_nb_channels</a>(*p);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (nb_channels > best_nb_channels) {</div>
<div class="line"> best_ch_layout = *p;</div>
<div class="line"> best_nb_channels = nb_channels;</div>
<div class="line"> }</div>
<div class="line"> p++;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> best_ch_layout;</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Audio encoding example</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> <a name="a11"></a><a class="code" href="decoding__encoding_8c.html#a67ded2b27004b72c27d4f3500a578ff6">audio_encode_example</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *filename)</div>
<div class="line">{</div>
<div class="line"> <a class="code" href="structAVCodec.html">AVCodec</a> *codec;</div>
<div class="line"> <a name="_a12"></a><a class="code" href="structAVCodecContext.html">AVCodecContext</a> *c= NULL;</div>
<div class="line"> <a name="_a13"></a><a class="code" href="structAVFrame.html">AVFrame</a> *<a name="a14"></a><a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>;</div>
<div class="line"> <a name="_a15"></a><a class="code" href="structAVPacket.html">AVPacket</a> <a name="a16"></a><a class="code" href="demuxing__decoding_8c.html#a3d4c6562f0b27cf0cacbbea5c038c090">pkt</a>;</div>
<div class="line"> <span class="keywordtype">int</span> i, j, k, ret, got_output;</div>
<div class="line"> <span class="keywordtype">int</span> buffer_size;</div>
<div class="line"> FILE *f;</div>
<div class="line"> uint16_t *samples;</div>
<div class="line"> <span class="keywordtype">float</span> t, tincr;</div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"Encode audio file %s\n"</span>, filename);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* find the MP2 encoder */</span></div>
<div class="line"> codec = <a name="a17"></a><a class="code" href="group__lavc__encoding.html#ga9f820c481615c3a02d0407bac0bdbf25">avcodec_find_encoder</a>(<a name="a18"></a><a class="code" href="group__lavc__core.html#ggaadca229ad2c20e060a14fec08a5cc7cea90ffce5aedda33269b22221916cd8487">AV_CODEC_ID_MP2</a>);</div>
<div class="line"> <span class="keywordflow">if</span> (!codec) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Codec not found\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> c = <a name="a19"></a><a class="code" href="group__lavc__core.html#gae80afec6f26df6607eaacf39b561c315">avcodec_alloc_context3</a>(codec);</div>
<div class="line"> <span class="keywordflow">if</span> (!c) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate audio codec context\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* put sample parameters */</span></div>
<div class="line"> c-><a name="a20"></a><a class="code" href="structAVCodecContext.html#a6b53fda85ad61baa345edbd96cb8a33c">bit_rate</a> = 64000;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* check that the encoder supports s16 pcm input */</span></div>
<div class="line"> c-><a name="a21"></a><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a> = <a name="a22"></a><a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5aea6132df57aebc3f76e10665395c46af">AV_SAMPLE_FMT_S16</a>;</div>
<div class="line"> <span class="keywordflow">if</span> (!<a class="code" href="decoding__encoding_8c.html#a93df45821682fdbabbc0092abff0bd61">check_sample_fmt</a>(codec, c-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>)) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Encoder does not support sample format %s"</span>,</div>
<div class="line"> <a name="a23"></a><a class="code" href="group__lavu__sampfmts.html#ga31b9d149b2de9821a65f4f5612970838">av_get_sample_fmt_name</a>(c-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>));</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* select other audio parameters supported by the encoder */</span></div>
<div class="line"> c-><a name="a24"></a><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a> = <a class="code" href="decoding__encoding_8c.html#a5809ff9edcce25b26466e3c806bf9854">select_sample_rate</a>(codec);</div>
<div class="line"> c-><a name="a25"></a><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06">channel_layout</a> = <a class="code" href="decoding__encoding_8c.html#ae6bb0fc8f05c78c13e9d38605038d994">select_channel_layout</a>(codec);</div>
<div class="line"> c-><a name="a26"></a><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a> = <a class="code" href="group__channel__mask__c.html#gac95619abeb32e4a3daa18e3ff3419380">av_get_channel_layout_nb_channels</a>(c-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06">channel_layout</a>);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* open it */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a name="a27"></a><a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d">avcodec_open2</a>(c, codec, NULL) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open codec\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> f = fopen(filename, <span class="stringliteral">"wb"</span>);</div>
<div class="line"> <span class="keywordflow">if</span> (!f) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open %s\n"</span>, filename);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* frame containing input raw audio */</span></div>
<div class="line"> frame = <a name="a28"></a><a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f">av_frame_alloc</a>();</div>
<div class="line"> <span class="keywordflow">if</span> (!frame) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate audio frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> frame-><a name="a29"></a><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea">nb_samples</a> = c-><a name="a30"></a><a class="code" href="structAVCodecContext.html#aec57f0d859a6df8b479cd93ca3a44a33">frame_size</a>;</div>
<div class="line"> frame-><a name="a31"></a><a class="code" href="structAVFrame.html#aed14fa772ce46881020fd1545c86432c">format</a> = c-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>;</div>
<div class="line"> frame-><a name="a32"></a><a class="code" href="structAVFrame.html#a5f343e0325e3e9d9ed20e34c9e156aef">channel_layout</a> = c-><a class="code" href="structAVCodecContext.html#aeb08c575a79eb84fc4155dda88f46c06">channel_layout</a>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* the codec gives us the frame size, in samples,</span></div>
<div class="line"><span class="comment"> * we calculate the size of the samples buffer in bytes */</span></div>
<div class="line"> buffer_size = <a name="a33"></a><a class="code" href="group__lavu__sampfmts.html#gaa7368bc4e3a366b688e81938ed55eb06">av_samples_get_buffer_size</a>(NULL, c-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>, c-><a class="code" href="structAVCodecContext.html#aec57f0d859a6df8b479cd93ca3a44a33">frame_size</a>,</div>
<div class="line"> c-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>, 0);</div>
<div class="line"> <span class="keywordflow">if</span> (buffer_size < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not get sample buffer size\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"> samples = <a name="a34"></a><a class="code" href="group__lavu__mem.html#ga9722446c5e310ffedfaac9489864796d">av_malloc</a>(buffer_size);</div>
<div class="line"> <span class="keywordflow">if</span> (!samples) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate %d bytes for samples buffer\n"</span>,</div>
<div class="line"> buffer_size);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">/* setup the data pointers in the AVFrame */</span></div>
<div class="line"> ret = <a name="a35"></a><a class="code" href="group__lavc__misc.html#ga66b44aad56fa22a78fb8916eb8cc0516">avcodec_fill_audio_frame</a>(frame, c-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>, c-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>,</div>
<div class="line"> (<span class="keyword">const</span> uint8_t*)samples, buffer_size, 0);</div>
<div class="line"> <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not setup audio frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* encode a single tone sound */</span></div>
<div class="line"> t = 0;</div>
<div class="line"> tincr = 2 * <a name="a36"></a><a class="code" href="mathematics_8h.html#ae71449b1cc6e6250b91f539153a7a0d3">M_PI</a> * 440.0 / c-><a class="code" href="structAVCodecContext.html#a8ff0b000c463361e234af48d03aadfc0">sample_rate</a>;</div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < 200; i++) {</div>
<div class="line"> <a name="a37"></a><a class="code" href="group__lavc__packet.html#gac9cb9756175b96e7441575803757fb73">av_init_packet</a>(&pkt);</div>
<div class="line"> pkt.<a name="a38"></a><a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL; <span class="comment">// packet data will be allocated by the encoder</span></div>
<div class="line"> pkt.<a name="a39"></a><a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (j = 0; j < c-><a class="code" href="structAVCodecContext.html#aec57f0d859a6df8b479cd93ca3a44a33">frame_size</a>; j++) {</div>
<div class="line"> samples[2*j] = (int)(sin(t) * 10000);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (k = 1; k < c-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>; k++)</div>
<div class="line"> samples[2*j + k] = samples[2*j];</div>
<div class="line"> t += tincr;</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">/* encode the samples */</span></div>
<div class="line"> ret = <a name="a40"></a><a class="code" href="group__lavc__encoding.html#ga93a49fbd0973b216dcb8a8c5dffe1d82">avcodec_encode_audio2</a>(c, &pkt, frame, &got_output);</div>
<div class="line"> <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error encoding audio frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (got_output) {</div>
<div class="line"> fwrite(pkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a>, 1, pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>, f);</div>
<div class="line"> <a name="a41"></a><a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&pkt);</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* get the delayed frames */</span></div>
<div class="line"> <span class="keywordflow">for</span> (got_output = 1; got_output; i++) {</div>
<div class="line"> ret = <a class="code" href="group__lavc__encoding.html#ga93a49fbd0973b216dcb8a8c5dffe1d82">avcodec_encode_audio2</a>(c, &pkt, NULL, &got_output);</div>
<div class="line"> <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error encoding frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (got_output) {</div>
<div class="line"> fwrite(pkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a>, 1, pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>, f);</div>
<div class="line"> <a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&pkt);</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> fclose(f);</div>
<div class="line"></div>
<div class="line"> <a name="a42"></a><a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&samples);</div>
<div class="line"> <a name="a43"></a><a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(&frame);</div>
<div class="line"> <a name="a44"></a><a class="code" href="group__lavc__core.html#gaf4daa92361efb3523ef5afeb0b54077f">avcodec_close</a>(c);</div>
<div class="line"> <a name="a45"></a><a class="code" href="group__lavu__mem.html#ga0c9096f498624c525aa2315b8a20c411">av_free</a>(c);</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Audio decoding.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> <a name="a46"></a><a class="code" href="decoding__encoding_8c.html#a5cbf8bd3441619622d3956d623d944b3">audio_decode_example</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *outfilename, <span class="keyword">const</span> <span class="keywordtype">char</span> *filename)</div>
<div class="line">{</div>
<div class="line"> <a class="code" href="structAVCodec.html">AVCodec</a> *codec;</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *c= NULL;</div>
<div class="line"> <span class="keywordtype">int</span> len;</div>
<div class="line"> FILE *f, *outfile;</div>
<div class="line"> uint8_t inbuf[<a name="a47"></a><a class="code" href="decoding__encoding_8c.html#a3a513b5612784dd20c0dfbdf456abd01">AUDIO_INBUF_SIZE</a> + <a name="a48"></a><a class="code" href="group__lavc__decoding.html#ga8f5b632a03ce83ac8e025894b1fc307a">AV_INPUT_BUFFER_PADDING_SIZE</a>];</div>
<div class="line"> <a class="code" href="structAVPacket.html">AVPacket</a> avpkt;</div>
<div class="line"> <a class="code" href="structAVFrame.html">AVFrame</a> *decoded_frame = NULL;</div>
<div class="line"></div>
<div class="line"> <a class="code" href="group__lavc__packet.html#gac9cb9756175b96e7441575803757fb73">av_init_packet</a>(&avpkt);</div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"Decode audio file %s to %s\n"</span>, filename, outfilename);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* find the mpeg audio decoder */</span></div>
<div class="line"> codec = <a name="a49"></a><a class="code" href="group__lavc__decoding.html#ga19a0ca553277f019dd5b0fec6e1f9dca">avcodec_find_decoder</a>(<a class="code" href="group__lavc__core.html#ggaadca229ad2c20e060a14fec08a5cc7cea90ffce5aedda33269b22221916cd8487">AV_CODEC_ID_MP2</a>);</div>
<div class="line"> <span class="keywordflow">if</span> (!codec) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Codec not found\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> c = <a class="code" href="group__lavc__core.html#gae80afec6f26df6607eaacf39b561c315">avcodec_alloc_context3</a>(codec);</div>
<div class="line"> <span class="keywordflow">if</span> (!c) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate audio codec context\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* open it */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d">avcodec_open2</a>(c, codec, NULL) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open codec\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> f = fopen(filename, <span class="stringliteral">"rb"</span>);</div>
<div class="line"> <span class="keywordflow">if</span> (!f) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open %s\n"</span>, filename);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"> outfile = fopen(outfilename, <span class="stringliteral">"wb"</span>);</div>
<div class="line"> <span class="keywordflow">if</span> (!outfile) {</div>
<div class="line"> <a class="code" href="group__lavu__mem.html#ga0c9096f498624c525aa2315b8a20c411">av_free</a>(c);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* decode until eof */</span></div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = inbuf;</div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = fread(inbuf, 1, <a class="code" href="decoding__encoding_8c.html#a3a513b5612784dd20c0dfbdf456abd01">AUDIO_INBUF_SIZE</a>, f);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">while</span> (avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> > 0) {</div>
<div class="line"> <span class="keywordtype">int</span> i, ch;</div>
<div class="line"> <span class="keywordtype">int</span> got_frame = 0;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (!decoded_frame) {</div>
<div class="line"> <span class="keywordflow">if</span> (!(decoded_frame = <a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f">av_frame_alloc</a>())) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate audio frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> len = <a name="a50"></a><a class="code" href="group__lavc__decoding.html#ga834bb1b062fbcc2de4cf7fb93f154a3e">avcodec_decode_audio4</a>(c, decoded_frame, &got_frame, &avpkt);</div>
<div class="line"> <span class="keywordflow">if</span> (len < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error while decoding\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (got_frame) {</div>
<div class="line"> <span class="comment">/* if a frame has been decoded, output it */</span></div>
<div class="line"> <span class="keywordtype">int</span> data_size = <a name="a51"></a><a class="code" href="group__lavu__sampfmts.html#ga0c3c218e1dd570ad4917c69a35a6c77d">av_get_bytes_per_sample</a>(c-><a class="code" href="structAVCodecContext.html#a1bdba69ea111e2a9d03fdaa7a46a4c45">sample_fmt</a>);</div>
<div class="line"> <span class="keywordflow">if</span> (data_size < 0) {</div>
<div class="line"> <span class="comment">/* This should not occur, checking just for paranoia */</span></div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Failed to calculate data size\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">for</span> (i=0; i<decoded_frame-><a class="code" href="structAVFrame.html#a02f45ab8191aea1660159f1e464237ea">nb_samples</a>; i++)</div>
<div class="line"> <span class="keywordflow">for</span> (ch=0; ch<c-><a class="code" href="structAVCodecContext.html#ac1e6c2cd1269caa7570575725c682a49">channels</a>; ch++)</div>
<div class="line"> fwrite(decoded_frame-><a name="a52"></a><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992">data</a>[ch] + data_size*i, 1, data_size, outfile);</div>
<div class="line"> }</div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> -= len;</div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> += len;</div>
<div class="line"> avpkt.<a name="a53"></a><a class="code" href="structAVPacket.html#a85dbbd306b44b02390cd91c45e6a0f76">dts</a> =</div>
<div class="line"> avpkt.<a name="a54"></a><a class="code" href="structAVPacket.html#a73bde0a37f3b1efc839f11295bfbf42a">pts</a> = <a name="a55"></a><a class="code" href="group__lavu__time.html#ga2eaefe702f95f619ea6f2d08afa01be1">AV_NOPTS_VALUE</a>;</div>
<div class="line"> <span class="keywordflow">if</span> (avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> < <a name="a56"></a><a class="code" href="decoding__encoding_8c.html#aebbadad5d16117f57006e8358ebf1ccc">AUDIO_REFILL_THRESH</a>) {</div>
<div class="line"> <span class="comment">/* Refill the input buffer, to avoid trying to decode</span></div>
<div class="line"><span class="comment"> * incomplete frames. Instead of this, one could also use</span></div>
<div class="line"><span class="comment"> * a parser, or use a proper container format through</span></div>
<div class="line"><span class="comment"> * libavformat. */</span></div>
<div class="line"> memmove(inbuf, avpkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a>, avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>);</div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = inbuf;</div>
<div class="line"> len = fread(avpkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> + avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>, 1,</div>
<div class="line"> <a class="code" href="decoding__encoding_8c.html#a3a513b5612784dd20c0dfbdf456abd01">AUDIO_INBUF_SIZE</a> - avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>, f);</div>
<div class="line"> <span class="keywordflow">if</span> (len > 0)</div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> += len;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> fclose(outfile);</div>
<div class="line"> fclose(f);</div>
<div class="line"></div>
<div class="line"> <a class="code" href="group__lavc__core.html#gaf4daa92361efb3523ef5afeb0b54077f">avcodec_close</a>(c);</div>
<div class="line"> <a class="code" href="group__lavu__mem.html#ga0c9096f498624c525aa2315b8a20c411">av_free</a>(c);</div>
<div class="line"> <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(&decoded_frame);</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Video encoding example</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> <a name="a57"></a><a class="code" href="decoding__encoding_8c.html#a7293f14f6e6315d54331137ae883079f">video_encode_example</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *filename, <span class="keywordtype">int</span> codec_id)</div>
<div class="line">{</div>
<div class="line"> <a class="code" href="structAVCodec.html">AVCodec</a> *codec;</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *c= NULL;</div>
<div class="line"> <span class="keywordtype">int</span> i, ret, x, y, got_output;</div>
<div class="line"> FILE *f;</div>
<div class="line"> <a class="code" href="structAVFrame.html">AVFrame</a> *<a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>;</div>
<div class="line"> <a class="code" href="structAVPacket.html">AVPacket</a> <a class="code" href="demuxing__decoding_8c.html#a3d4c6562f0b27cf0cacbbea5c038c090">pkt</a>;</div>
<div class="line"> uint8_t endcode[] = { 0, 0, 1, 0xb7 };</div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"Encode video file %s\n"</span>, filename);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* find the mpeg1 video encoder */</span></div>
<div class="line"> codec = <a class="code" href="group__lavc__encoding.html#ga9f820c481615c3a02d0407bac0bdbf25">avcodec_find_encoder</a>(codec_id);</div>
<div class="line"> <span class="keywordflow">if</span> (!codec) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Codec not found\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> c = <a class="code" href="group__lavc__core.html#gae80afec6f26df6607eaacf39b561c315">avcodec_alloc_context3</a>(codec);</div>
<div class="line"> <span class="keywordflow">if</span> (!c) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate video codec context\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* put sample parameters */</span></div>
<div class="line"> c-><a class="code" href="structAVCodecContext.html#a6b53fda85ad61baa345edbd96cb8a33c">bit_rate</a> = 400000;</div>
<div class="line"> <span class="comment">/* resolution must be a multiple of two */</span></div>
<div class="line"> c-><a name="a58"></a><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956">width</a> = 352;</div>
<div class="line"> c-><a name="a59"></a><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a> = 288;</div>
<div class="line"> <span class="comment">/* frames per second */</span></div>
<div class="line"> c-><a name="a60"></a><a class="code" href="structAVCodecContext.html#ab7bfeb9fa5840aac090e2b0bd0ef7589">time_base</a> = (<a name="_a61"></a><a class="code" href="structAVRational.html">AVRational</a>){1,25};</div>
<div class="line"> <span class="comment">/* emit one intra frame every ten frames</span></div>
<div class="line"><span class="comment"> * check frame pict_type before passing frame</span></div>
<div class="line"><span class="comment"> * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I</span></div>
<div class="line"><span class="comment"> * then gop_size is ignored and the output of encoder</span></div>
<div class="line"><span class="comment"> * will always be I frame irrespective to gop_size</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> c-><a name="a62"></a><a class="code" href="structAVCodecContext.html#a9b6b3f1fcbdcc2ad9f4dbb4370496e38">gop_size</a> = 10;</div>
<div class="line"> c-><a name="a63"></a><a class="code" href="structAVCodecContext.html#a3e5334a611a3e2a6a653805bb9e2d4d4">max_b_frames</a> = 1;</div>
<div class="line"> c-><a name="a64"></a><a class="code" href="structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2">pix_fmt</a> = <a name="a65"></a><a class="code" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5a1aa7677092740d8def31655b5d7f0cc2">AV_PIX_FMT_YUV420P</a>;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (codec_id == <a name="a66"></a><a class="code" href="group__lavc__core.html#ggaadca229ad2c20e060a14fec08a5cc7cea3d4c051c8b18a3c18750676a308c10be">AV_CODEC_ID_H264</a>)</div>
<div class="line"> <a name="a67"></a><a class="code" href="group__opt__set__funcs.html#ga5fd4b92bdf4f392a2847f711676a7537">av_opt_set</a>(c-><a name="a68"></a><a class="code" href="structAVCodecContext.html#af3379123060ad8cc9c321c29af4f8360">priv_data</a>, <span class="stringliteral">"preset"</span>, <span class="stringliteral">"slow"</span>, 0);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* open it */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d">avcodec_open2</a>(c, codec, NULL) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open codec\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> f = fopen(filename, <span class="stringliteral">"wb"</span>);</div>
<div class="line"> <span class="keywordflow">if</span> (!f) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open %s\n"</span>, filename);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> frame = <a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f">av_frame_alloc</a>();</div>
<div class="line"> <span class="keywordflow">if</span> (!frame) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate video frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"> frame-><a class="code" href="structAVFrame.html#aed14fa772ce46881020fd1545c86432c">format</a> = c-><a class="code" href="structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2">pix_fmt</a>;</div>
<div class="line"> frame-><a name="a69"></a><a class="code" href="structAVFrame.html#a1e71ce60cedd5f3b6811714a9f7f9e0a">width</a> = c-><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956">width</a>;</div>
<div class="line"> frame-><a name="a70"></a><a class="code" href="structAVFrame.html#a3f89733f429c98ba5bc64373fb0a3f13">height</a> = c-><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* the image can be allocated by any means and av_image_alloc() is</span></div>
<div class="line"><span class="comment"> * just the most convenient way if av_malloc() is to be used */</span></div>
<div class="line"> ret = <a name="a71"></a><a class="code" href="group__lavu__picture.html#ga841e0a89a642e24141af1918a2c10448">av_image_alloc</a>(frame-><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992">data</a>, frame-><a name="a72"></a><a class="code" href="structAVFrame.html#aa52bfc6605f6a3059a0c3226cc0f6567">linesize</a>, c-><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956">width</a>, c-><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a>,</div>
<div class="line"> c-><a class="code" href="structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2">pix_fmt</a>, 32);</div>
<div class="line"> <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate raw picture buffer\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* encode 1 second of video */</span></div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < 25; i++) {</div>
<div class="line"> <a class="code" href="group__lavc__packet.html#gac9cb9756175b96e7441575803757fb73">av_init_packet</a>(&pkt);</div>
<div class="line"> pkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL; <span class="comment">// packet data will be allocated by the encoder</span></div>
<div class="line"> pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;</div>
<div class="line"></div>
<div class="line"> fflush(stdout);</div>
<div class="line"> <span class="comment">/* prepare a dummy image */</span></div>
<div class="line"> <span class="comment">/* Y */</span></div>
<div class="line"> <span class="keywordflow">for</span> (y = 0; y < c-><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a>; y++) {</div>
<div class="line"> <span class="keywordflow">for</span> (x = 0; x < c-><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956">width</a>; x++) {</div>
<div class="line"> frame-><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992">data</a>[0][y * frame-><a class="code" href="structAVFrame.html#aa52bfc6605f6a3059a0c3226cc0f6567">linesize</a>[0] + x] = x + y + i * 3;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Cb and Cr */</span></div>
<div class="line"> <span class="keywordflow">for</span> (y = 0; y < c-><a class="code" href="structAVCodecContext.html#a0449afd803eb107bd4dbc8b5ea22e363">height</a>/2; y++) {</div>
<div class="line"> <span class="keywordflow">for</span> (x = 0; x < c-><a class="code" href="structAVCodecContext.html#a0d8f46461754e8abea0847dcbc41b956">width</a>/2; x++) {</div>
<div class="line"> frame-><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992">data</a>[1][y * frame-><a class="code" href="structAVFrame.html#aa52bfc6605f6a3059a0c3226cc0f6567">linesize</a>[1] + x] = 128 + y + i * 2;</div>
<div class="line"> frame-><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992">data</a>[2][y * frame-><a class="code" href="structAVFrame.html#aa52bfc6605f6a3059a0c3226cc0f6567">linesize</a>[2] + x] = 64 + x + i * 5;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> frame-><a name="a73"></a><a class="code" href="structAVFrame.html#a0452833e3ab6ddd7acbf82817a7818a4">pts</a> = i;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* encode the image */</span></div>
<div class="line"> ret = <a name="a74"></a><a class="code" href="group__lavc__encoding.html#gaa2dc9e9ea2567ebb2801a08153c7306b">avcodec_encode_video2</a>(c, &pkt, frame, &got_output);</div>
<div class="line"> <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error encoding frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (got_output) {</div>
<div class="line"> printf(<span class="stringliteral">"Write frame %3d (size=%5d)\n"</span>, i, pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>);</div>
<div class="line"> fwrite(pkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a>, 1, pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>, f);</div>
<div class="line"> <a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&pkt);</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* get the delayed frames */</span></div>
<div class="line"> <span class="keywordflow">for</span> (got_output = 1; got_output; i++) {</div>
<div class="line"> fflush(stdout);</div>
<div class="line"></div>
<div class="line"> ret = <a class="code" href="group__lavc__encoding.html#gaa2dc9e9ea2567ebb2801a08153c7306b">avcodec_encode_video2</a>(c, &pkt, NULL, &got_output);</div>
<div class="line"> <span class="keywordflow">if</span> (ret < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error encoding frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (got_output) {</div>
<div class="line"> printf(<span class="stringliteral">"Write frame %3d (size=%5d)\n"</span>, i, pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>);</div>
<div class="line"> fwrite(pkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a>, 1, pkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a>, f);</div>
<div class="line"> <a class="code" href="group__lavc__packet.html#ga63d5a489b419bd5d45cfd09091cbcbc2">av_packet_unref</a>(&pkt);</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* add sequence end code to have a real mpeg file */</span></div>
<div class="line"> fwrite(endcode, 1, <span class="keyword">sizeof</span>(endcode), f);</div>
<div class="line"> fclose(f);</div>
<div class="line"></div>
<div class="line"> <a class="code" href="group__lavc__core.html#gaf4daa92361efb3523ef5afeb0b54077f">avcodec_close</a>(c);</div>
<div class="line"> <a class="code" href="group__lavu__mem.html#ga0c9096f498624c525aa2315b8a20c411">av_free</a>(c);</div>
<div class="line"> <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&frame-><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992">data</a>[0]);</div>
<div class="line"> <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(&frame);</div>
<div class="line"> printf(<span class="stringliteral">"\n"</span>);</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Video decoding example</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> <a name="a75"></a><a class="code" href="decoding__encoding_8c.html#aea973224783a5595366684c76c0ee06c">pgm_save</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">int</span> wrap, <span class="keywordtype">int</span> xsize, <span class="keywordtype">int</span> ysize,</div>
<div class="line"> <span class="keywordtype">char</span> *filename)</div>
<div class="line">{</div>
<div class="line"> FILE *f;</div>
<div class="line"> <span class="keywordtype">int</span> i;</div>
<div class="line"></div>
<div class="line"> f = fopen(filename,<span class="stringliteral">"w"</span>);</div>
<div class="line"> fprintf(f, <span class="stringliteral">"P5\n%d %d\n%d\n"</span>, xsize, ysize, 255);</div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < ysize; i++)</div>
<div class="line"> fwrite(buf + i * wrap, 1, xsize, f);</div>
<div class="line"> fclose(f);</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a76"></a><a class="code" href="decoding__encoding_8c.html#a1d01e17e5817622d9419f681603f6c8f">decode_write_frame</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *outfilename, <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *avctx,</div>
<div class="line"> <a class="code" href="structAVFrame.html">AVFrame</a> *frame, <span class="keywordtype">int</span> *frame_count, <a class="code" href="structAVPacket.html">AVPacket</a> *pkt, <span class="keywordtype">int</span> last)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">int</span> len, got_frame;</div>
<div class="line"> <span class="keywordtype">char</span> buf[1024];</div>
<div class="line"></div>
<div class="line"> len = <a name="a77"></a><a class="code" href="group__lavc__decoding.html#ga99ee61b6dcffb7817a275d39da58cc74">avcodec_decode_video2</a>(avctx, frame, &got_frame, pkt);</div>
<div class="line"> <span class="keywordflow">if</span> (len < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error while decoding frame %d\n"</span>, *frame_count);</div>
<div class="line"> <span class="keywordflow">return</span> len;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (got_frame) {</div>
<div class="line"> printf(<span class="stringliteral">"Saving %sframe %3d\n"</span>, last ? <span class="stringliteral">"last "</span> : <span class="stringliteral">""</span>, *frame_count);</div>
<div class="line"> fflush(stdout);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* the picture is allocated by the decoder, no need to free it */</span></div>
<div class="line"> snprintf(buf, <span class="keyword">sizeof</span>(buf), outfilename, *frame_count);</div>
<div class="line"> <a class="code" href="decoding__encoding_8c.html#aea973224783a5595366684c76c0ee06c">pgm_save</a>(frame-><a class="code" href="structAVFrame.html#a1d0f65014a8d1bf78cec8cbed2304992">data</a>[0], frame-><a class="code" href="structAVFrame.html#aa52bfc6605f6a3059a0c3226cc0f6567">linesize</a>[0],</div>
<div class="line"> frame-><a class="code" href="structAVFrame.html#a1e71ce60cedd5f3b6811714a9f7f9e0a">width</a>, frame-><a class="code" href="structAVFrame.html#a3f89733f429c98ba5bc64373fb0a3f13">height</a>, buf);</div>
<div class="line"> (*frame_count)++;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">if</span> (pkt-><a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a>) {</div>
<div class="line"> pkt-><a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> -= len;</div>
<div class="line"> pkt-><a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> += len;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> <a name="a78"></a><a class="code" href="decoding__encoding_8c.html#a8b416e073a13f42326e97a86ce283db1">video_decode_example</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *outfilename, <span class="keyword">const</span> <span class="keywordtype">char</span> *filename)</div>
<div class="line">{</div>
<div class="line"> <a class="code" href="structAVCodec.html">AVCodec</a> *codec;</div>
<div class="line"> <a class="code" href="structAVCodecContext.html">AVCodecContext</a> *c= NULL;</div>
<div class="line"> <span class="keywordtype">int</span> frame_count;</div>
<div class="line"> FILE *f;</div>
<div class="line"> <a class="code" href="structAVFrame.html">AVFrame</a> *<a class="code" href="demuxing__decoding_8c.html#ad7d33d579a8d4241a5e643e39287a209">frame</a>;</div>
<div class="line"> uint8_t inbuf[<a name="a79"></a><a class="code" href="decoding__encoding_8c.html#a6378f14810330164b7fb66f3334b2a27">INBUF_SIZE</a> + <a class="code" href="group__lavc__decoding.html#ga8f5b632a03ce83ac8e025894b1fc307a">AV_INPUT_BUFFER_PADDING_SIZE</a>];</div>
<div class="line"> <a class="code" href="structAVPacket.html">AVPacket</a> avpkt;</div>
<div class="line"></div>
<div class="line"> <a class="code" href="group__lavc__packet.html#gac9cb9756175b96e7441575803757fb73">av_init_packet</a>(&avpkt);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* set end of buffer to 0 (this ensures that no overreading happens for damaged mpeg streams) */</span></div>
<div class="line"> memset(inbuf + <a class="code" href="decoding__encoding_8c.html#a6378f14810330164b7fb66f3334b2a27">INBUF_SIZE</a>, 0, <a class="code" href="group__lavc__decoding.html#ga8f5b632a03ce83ac8e025894b1fc307a">AV_INPUT_BUFFER_PADDING_SIZE</a>);</div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"Decode video file %s to %s\n"</span>, filename, outfilename);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* find the mpeg1 video decoder */</span></div>
<div class="line"> codec = <a class="code" href="group__lavc__decoding.html#ga19a0ca553277f019dd5b0fec6e1f9dca">avcodec_find_decoder</a>(<a name="a80"></a><a class="code" href="group__lavc__core.html#ggaadca229ad2c20e060a14fec08a5cc7ceaf019b13f4891b36ae579cd7bc96d1f78">AV_CODEC_ID_MPEG1VIDEO</a>);</div>
<div class="line"> <span class="keywordflow">if</span> (!codec) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Codec not found\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> c = <a class="code" href="group__lavc__core.html#gae80afec6f26df6607eaacf39b561c315">avcodec_alloc_context3</a>(codec);</div>
<div class="line"> <span class="keywordflow">if</span> (!c) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate video codec context\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (codec-><a name="a81"></a><a class="code" href="structAVCodec.html#af51f7ff3dac8b730f46b9713e49a2518">capabilities</a> & <a name="a82"></a><a class="code" href="group__lavc__core.html#ga239656738c46ed6e3cde210a9390433a">AV_CODEC_CAP_TRUNCATED</a>)</div>
<div class="line"> c-><a name="a83"></a><a class="code" href="structAVCodecContext.html#abb01e291550fa3fb96188af4d494587e">flags</a> |= <a name="a84"></a><a class="code" href="group__lavc__core.html#ga74131d472b00ef60d8632702bfec0984">AV_CODEC_FLAG_TRUNCATED</a>; <span class="comment">// we do not send complete frames</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">/* For some codecs, such as msmpeg4 and mpeg4, width and height</span></div>
<div class="line"><span class="comment"> MUST be initialized there because this information is not</span></div>
<div class="line"><span class="comment"> available in the bitstream. */</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">/* open it */</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d">avcodec_open2</a>(c, codec, NULL) < 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open codec\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> f = fopen(filename, <span class="stringliteral">"rb"</span>);</div>
<div class="line"> <span class="keywordflow">if</span> (!f) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not open %s\n"</span>, filename);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> frame = <a class="code" href="group__lavu__frame.html#gac700017c5270c79c1e1befdeeb008b2f">av_frame_alloc</a>();</div>
<div class="line"> <span class="keywordflow">if</span> (!frame) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Could not allocate video frame\n"</span>);</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> frame_count = 0;</div>
<div class="line"> <span class="keywordflow">for</span> (;;) {</div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = fread(inbuf, 1, <a class="code" href="decoding__encoding_8c.html#a6378f14810330164b7fb66f3334b2a27">INBUF_SIZE</a>, f);</div>
<div class="line"> <span class="keywordflow">if</span> (avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> == 0)</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* NOTE1: some codecs are stream based (mpegvideo, mpegaudio)</span></div>
<div class="line"><span class="comment"> and this is the only method to use them because you cannot</span></div>
<div class="line"><span class="comment"> know the compressed data size before analysing it.</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> BUT some other codecs (msmpeg4, mpeg4) are inherently frame</span></div>
<div class="line"><span class="comment"> based, so you must call them with all the data for one</span></div>
<div class="line"><span class="comment"> frame exactly. You must also initialize 'width' and</span></div>
<div class="line"><span class="comment"> 'height' before initializing them. */</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">/* NOTE2: some codecs allow the raw parameters (frame size,</span></div>
<div class="line"><span class="comment"> sample rate) to be changed at any frame. We handle this, so</span></div>
<div class="line"><span class="comment"> you should also take care of it */</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">/* here, we use a stream based decoder (mpeg1video), so we</span></div>
<div class="line"><span class="comment"> feed decoder and see if it could decode a frame */</span></div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = inbuf;</div>
<div class="line"> <span class="keywordflow">while</span> (avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> > 0)</div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="decoding__encoding_8c.html#a1d01e17e5817622d9419f681603f6c8f">decode_write_frame</a>(outfilename, c, frame, &frame_count, &avpkt, 0) < 0)</div>
<div class="line"> exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* some codecs, such as MPEG, transmit the I and P frame with a</span></div>
<div class="line"><span class="comment"> latency of one frame. You must do the following to have a</span></div>
<div class="line"><span class="comment"> chance to get the last frame of the video */</span></div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#aaf4fe58dfcc7c232c1f2268b539d8367">data</a> = NULL;</div>
<div class="line"> avpkt.<a class="code" href="structAVPacket.html#a4d1ea19f63eb107111fd650ca514d1f4">size</a> = 0;</div>
<div class="line"> <a class="code" href="decoding__encoding_8c.html#a1d01e17e5817622d9419f681603f6c8f">decode_write_frame</a>(outfilename, c, frame, &frame_count, &avpkt, 1);</div>
<div class="line"></div>
<div class="line"> fclose(f);</div>
<div class="line"></div>
<div class="line"> <a class="code" href="group__lavc__core.html#gaf4daa92361efb3523ef5afeb0b54077f">avcodec_close</a>(c);</div>
<div class="line"> <a class="code" href="group__lavu__mem.html#ga0c9096f498624c525aa2315b8a20c411">av_free</a>(c);</div>
<div class="line"> <a class="code" href="group__lavu__frame.html#ga979d73f3228814aee56aeca0636e37cc">av_frame_free</a>(&frame);</div>
<div class="line"> printf(<span class="stringliteral">"\n"</span>);</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> <a name="a85"></a><a class="code" href="decoding__encoding_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *output_type;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* register all the codecs */</span></div>
<div class="line"> <a name="a86"></a><a class="code" href="group__lavc__core.html#gaf1a2bb4e7c7611c131bb6212bf0fa639">avcodec_register_all</a>();</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (argc < 2) {</div>
<div class="line"> printf(<span class="stringliteral">"usage: %s output_type\n"</span></div>
<div class="line"> <span class="stringliteral">"API example program to decode/encode a media stream with libavcodec.\n"</span></div>
<div class="line"> <span class="stringliteral">"This program generates a synthetic stream and encodes it to a file\n"</span></div>
<div class="line"> <span class="stringliteral">"named test.h264, test.mp2 or test.mpg depending on output_type.\n"</span></div>
<div class="line"> <span class="stringliteral">"The encoded stream is then decoded and written to a raw data output.\n"</span></div>
<div class="line"> <span class="stringliteral">"output_type must be chosen between 'h264', 'mp2', 'mpg'.\n"</span>,</div>
<div class="line"> argv[0]);</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> }</div>
<div class="line"> output_type = argv[1];</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> (!strcmp(output_type, <span class="stringliteral">"h264"</span>)) {</div>
<div class="line"> <a class="code" href="decoding__encoding_8c.html#a7293f14f6e6315d54331137ae883079f">video_encode_example</a>(<span class="stringliteral">"test.h264"</span>, <a class="code" href="group__lavc__core.html#ggaadca229ad2c20e060a14fec08a5cc7cea3d4c051c8b18a3c18750676a308c10be">AV_CODEC_ID_H264</a>);</div>
<div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strcmp(output_type, <span class="stringliteral">"mp2"</span>)) {</div>
<div class="line"> <a class="code" href="decoding__encoding_8c.html#a67ded2b27004b72c27d4f3500a578ff6">audio_encode_example</a>(<span class="stringliteral">"test.mp2"</span>);</div>
<div class="line"> <a class="code" href="decoding__encoding_8c.html#a5cbf8bd3441619622d3956d623d944b3">audio_decode_example</a>(<span class="stringliteral">"test.pcm"</span>, <span class="stringliteral">"test.mp2"</span>);</div>
<div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!strcmp(output_type, <span class="stringliteral">"mpg"</span>)) {</div>
<div class="line"> <a class="code" href="decoding__encoding_8c.html#a7293f14f6e6315d54331137ae883079f">video_encode_example</a>(<span class="stringliteral">"test.mpg"</span>, <a class="code" href="group__lavc__core.html#ggaadca229ad2c20e060a14fec08a5cc7ceaf019b13f4891b36ae579cd7bc96d1f78">AV_CODEC_ID_MPEG1VIDEO</a>);</div>
<div class="line"> <a class="code" href="decoding__encoding_8c.html#a8b416e073a13f42326e97a86ce283db1">video_decode_example</a>(<span class="stringliteral">"test%02d.pgm"</span>, <span class="stringliteral">"test.mpg"</span>);</div>
<div class="line"> } <span class="keywordflow">else</span> {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Invalid output type '%s', choose between 'h264', 'mp2', or 'mpg'\n"</span>,</div>
<div class="line"> output_type);</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
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