Em Tue, 28 Oct 2014 21:42:50 -0200 Mauro Carvalho Chehab <[email protected]> escreveu:
> Before starting with the description, this is the simplified diagram of
> a media device (without IR, eeprom and other beasts):
As reference, a more complete diagram would be:
+------------------+
| IR
|
+------------------+
|
|
v
+------------------+
| IR POLL or
DMA |
+------------------+
|
|
v
+------------------+
| devnode
input8 |
+------------------+
+------------------------------------+
v |
+----------------+
+-------+-------------------+-----------+
| demod_video | +-----> | tuner | A/V switch
| composite |
+----------------+ |
+-------+-------------------+-----------+
| | |
| | |
v | v
+--------------+-----+-----------------+ |
+------------------+
+- | dvb | DMA | analog | | | demod_audio
|
| +--------------+-----+-----------------+ |
+------------------+
| ^ | | |
| +---------------+ | | |
| | v | v
| +--------------+ | +----------------+ |
+------------------+
+> | devnode dvr0 | | | devnode video0 | | | audio DMA
|
+--------------+ | +----------------+ |
+------------------+
| | |
| | |
| | v
| |
+------------------+
| | | devnode
pcmC1D0c |
| |
+------------------+
| |
| |
| |
|
+--------+--------+-------------------+
| | analog | tuner | digital
|
|
+--------+--------+-------------------+
| |
| |
| v
|
+------------------+
+--------------------------------------- |
digital_demux |
+------------------+
Regards,
Mauro
-
Dot file for the above diagram:
digraph media_hardware {
node [shape=record]
DMA1[label = "<dvb> dvb | <dma> DMA | <video> analog"]
DMA2[label = "audio DMA"]
DMA3[label = "IR POLL or DMA"]
tuner[label = "<analog> analog | <tuner> tuner | <digital> digital"]
input[label = "<tuner> tuner | <switch> A/V switch | <composite> composite"]
DMA1:video -> "devnode video0"
DMA1:dvb -> "devnode dvr0"
"digital_demux" -> DMA1:dvb
demod_video -> DMA1:video
tuner:digital -> "digital_demux"
tuner:analog -> input:tuner
input:switch -> demod_video
input:switch -> demod_audio
demod_audio -> DMA2
DMA2 -> "devnode pcmC1D0c"
IR -> DMA3
DMA3 -> "devnode input8"
}
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