On Fri, Jan 4, 2013 at 12:57 AM, Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> wrote: > Em Fri, 4 Jan 2013 00:39:25 +0530 > Manu Abraham <abraham.manu@xxxxxxxxx> escreveu: > >> Hi Antti, >> >> On Thu, Jan 3, 2013 at 9:04 PM, Antti Palosaari <crope@xxxxxx> wrote: >> > On 01/01/2013 06:48 PM, Manu Abraham wrote: >> >> >> >> On Tue, Jan 1, 2013 at 8:30 PM, Mauro Carvalho Chehab >> >> <mchehab@xxxxxxxxxx> wrote: >> >> >> >>> [RFCv4] dvb: Add DVBv5 properties for quality parameters >> >>> >> >>> The DVBv3 quality parameters are limited on several ways: >> >>> - Doesn't provide any way to indicate the used measure; >> >>> - Userspace need to guess how to calculate the measure; >> >>> - Only a limited set of stats are supported; >> >>> - Doesn't provide QoS measure for the OFDM TPS/TMCC >> >>> carriers, used to detect the network parameters for >> >>> DVB-T/ISDB-T; >> >>> - Can't be called in a way to require them to be filled >> >>> all at once (atomic reads from the hardware), with may >> >>> cause troubles on interpreting them on userspace; >> >>> - On some OFDM delivery systems, the carriers can be >> >>> independently modulated, having different properties. >> >>> Currently, there's no way to report per-layer stats; >> >> >> >> >> >> per layer stats is a mythical bird, nothing of that sort does exist. If >> >> some >> >> driver states that it is simply due to lack of knowledge at the coding >> >> side. >> >> >> >> ISDB-T uses hierarchial modulation, just like DVB-S2 or DVB-T2 >> > >> > >> > Manu, you confused now two concept (which are aimed to resolve same real >> > life problem) - hierarchical coding and multiple transport stream. Both are >> > quite similar on lower level of radio channel, but differs on upper levels. >> > >> > Hierarchical is a little bit weird baby as it remuxes those lower lever >> > radio channels (called layers in case of ISDB-T) to one single mux! >> >> That is not really correct. There is one single OFDM channel, the layers >> are processed via hierarchial separation. Stuffing exists, to maintain >> constant rate. >> >> http://farm9.staticflickr.com/8077/8343296328_e1e375b519_b_d.jpg >> >> When rate is constant within the same channel.. >> (The only case what I can think parameters could be different with a >> constant rate, >> is that stuffing frames are unaccounted for. Most likely a bug ?) > > What did you smoke? That picture has nothing to do with ISDB! > ARIB STD – B31 Version 1.6-E2 －17－ Fig. 3-2 shows the basic configuration of the channel coding. It just shows, you understand crap. Manu -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
