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MediaPortal 1
Development
General Development (no feature request here!)
Multichannel decryption scenario
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<blockquote data-quote="mm1352000" data-source="post: 1009085" data-attributes="member: 82144"><p>No problem. Like I said, I think your project is interesting so I'll be interested to see the outcome. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p> </p><p> </p><p> </p><p></p><p>To be clear, as I understand it that "96 Mbps" is the bitrate limitation for the stream that you pass through the CAM, not just the bitrate limitation for decrypting. In other words, if each channel is 16 Mbps then you can only pass 6 channels through the CAM regardless of whether they are encrypted or not.</p><p> </p><p> </p><p></p><p>Yes, sort of.</p><p>The FPGA will need to implement EN 50221 in order to send instructions to the CAM.</p><p><a href="http://www.dvb.org/technology/standards/En50221.V1.pdf" target="_blank">http://www.dvb.org/technology/standards/En50221.V1.pdf</a></p><p> </p><p>In section 8.4.3.4 you can see the structure of the decrypt instructions that you would send to the CAM. This is called CA PMT (conditional access program map table). You must send one CA PMT for each service (channel) that you want to decrypt. Each CA PMT must contain the details of the video, audio and subtitle PIDs for the channel.</p><p> </p><p> </p><p></p><p>No problems.... only, I think this is quite a big project. If I started with nothing it could take... maybe one year working part time.</p><p>For me, the hardest thing would be establishing communication with the CAM. There is physical, transport and application layers to take care of... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p> </p><p> </p><p> </p><p>mm</p></blockquote><p></p>
[QUOTE="mm1352000, post: 1009085, member: 82144"] No problem. Like I said, I think your project is interesting so I'll be interested to see the outcome. :) To be clear, as I understand it that "96 Mbps" is the bitrate limitation for the stream that you pass through the CAM, not just the bitrate limitation for decrypting. In other words, if each channel is 16 Mbps then you can only pass 6 channels through the CAM regardless of whether they are encrypted or not. Yes, sort of. The FPGA will need to implement EN 50221 in order to send instructions to the CAM. [url]http://www.dvb.org/technology/standards/En50221.V1.pdf[/url] In section 8.4.3.4 you can see the structure of the decrypt instructions that you would send to the CAM. This is called CA PMT (conditional access program map table). You must send one CA PMT for each service (channel) that you want to decrypt. Each CA PMT must contain the details of the video, audio and subtitle PIDs for the channel. No problems.... only, I think this is quite a big project. If I started with nothing it could take... maybe one year working part time. For me, the hardest thing would be establishing communication with the CAM. There is physical, transport and application layers to take care of... :) mm [/QUOTE]
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