<div dir="ltr"><div>Hi to all<br></div>Is there any material or book to understand the whole ffmpeg library code.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 30, 2015 at 12:50 PM, Ivan Roubíček <span dir="ltr"><<a href="mailto:Ivan.Roubicek@zld.cz" target="_blank">Ivan.Roubicek@zld.cz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hello guys,<u></u><u></u></p>
<p class="MsoNormal">what would be the correct way to parse H264 SPS nad PPS so I can get width, height, etc.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I’m trying something like this but it does nothing<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#4ec9b0;background:black">AVCodecParserContext</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">*</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">parser</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">=</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">av_parser_init</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:#b8d7a3;background:black">AV_CODEC_ID_H264</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">);</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">      
<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#4ec9b0;background:black">AVCodec</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">*</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">pCodec</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">=</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">avcodec_find_decoder</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:#b8d7a3;background:black">AV_CODEC_ID_H264</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">);</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#4ec9b0;background:black">AVCodecContext</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">*</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">pCodecCtx</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">=</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">avcodec_alloc_context3</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">pCodec</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">);</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black"><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">pCodecCtx</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">=</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">avcodec_alloc_context3</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">pCodec</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">);</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black"><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#4ec9b0;background:black">uint8_t</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">*</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">poutbuf</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">=</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#569cd6;background:black">nullptr</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">;</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#569cd6;background:black">int</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">poutbuf_size</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">=</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b5cea8;background:black">0</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">;</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black"><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:#569cd6;background:black">int</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">len</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">=</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">av_parser_parse2</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">(</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">parser</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">,</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">pCodecCtx</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">,</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">&</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">poutbuf</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">,</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">&</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">poutbuf_size</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">,</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#c8c8c8;background:black">pSps</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">,</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#7f7f7f;background:black">sps_size</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">,</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b5cea8;background:black">0</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">,</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b5cea8;background:black">0</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">,</span><span style="font-size:9.5pt;font-family:Consolas;color:gainsboro;background:black">
</span><span style="font-size:9.5pt;font-family:Consolas;color:#b5cea8;background:black">0</span><span style="font-size:9.5pt;font-family:Consolas;color:#b4b4b4;background:black">);</span><span style="font-size:9.5pt;font-family:Consolas"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal">Best regards Ivan<u></u><u></u></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr">syed mutiur rahman</div></div>
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