[dvblast-devel] DVBLAST and DVB-T2 support
Kompan Kolia
kompan at yandex.ru
Wed Apr 4 08:31:23 CEST 2012
OK. Thanks!
I will get a DVB-T2 card for a couple of weeks and be sure to test your patch.
04.04.2012, 03:38, "Georgi Chorbadzhiyski" <gf at unixsol.org>:
> On 4/1/12 9:52 PM, Kompan Kolia wrote:
>
>> 30.03.2012, 21:20, "Christophe Massiot"<cmassiot at openheadend.tv>:
>>> Le 26 mars 2012 à 13:11, Kompan Kolia a écrit :
>>>> Can DVBLAST recieve DVB-T2 signal?
>>>>
>>>> In Russia, Moscow we have DVB-T2 signal..
>>>> I would like to receive this signal by dvblast.
>>> It would require a few changes. First make an interface to be able to specify system "dvb-t2" (the way I used with dvb-s2 doesn't work here because option -m was also used in dvb-t). Then you may need to add the new guard interval, transmission and bandwidth settings (with #ifdef).
>> Can i ask you to write patch for DVB-T2 support? :)
>
> Please try to apply the attached patch and see if it is working.
>
> This patch adds *untested* support for DVB-T2. The patch is made
> by reading Linux media API docs about T2 and no testing was done
> with any hardware. The way to choose T2 is a hack and should be done
> properly if this patch is working at all.
>
> So, in order to instruct kernel to use T2 you have to give dvblast
> one of the two options --guard -2 or --transmission -2 the other
> options should be set like you are setting DVB-T.
>
> PLP_ID is hard coded to 0. There is not enough documentation for
> this property so no additional command line options were added.
>
> --
> Georgi Chorbadzhiyski
> http://georgi.unixsol.org/
>
> From bba16f0ea748118e9447bc8c11ea797474822bdb Mon Sep 17 00:00:00 2001
> From: Georgi Chorbadzhiyski <gf at unixsol.org>
> Date: Wed, 4 Apr 2012 02:28:49 +0300
> Subject: [PATCH] Add untested and hacky support for DVB-T2.
>
> This patch adds *untested* support for DVB-T2. The patch is made
> by reading Linux media API docs about T2 and no testing was done
> with any hardware. The way to choose T2 is a hack and should be done
> properly if this patch is working at all.
>
> So, in order to instruct kernel to use T2 you have to give dvblast
> one of the two options --guard -2 or --transmission -2 the other
> options should be set like you are setting DVB-T.
>
> PLP_ID is hardcoded to 0. There is not enough documentation for
> this property so no aditional command line options were added.
> ---
> dvb.c | 37 ++++++++++++++++++++++++++++++++++++-
> dvblast.c | 6 +++++-
> 2 files changed, 41 insertions(+), 2 deletions(-)
>
> diff --git a/dvb.c b/dvb.c
> index b0a86ce..543948a 100644
> --- a/dvb.c
> +++ b/dvb.c
> @@ -653,8 +653,12 @@ static fe_guard_interval_t GetGuard(void)
> case 16: return GUARD_INTERVAL_1_16;
> case 8: return GUARD_INTERVAL_1_8;
> case 4: return GUARD_INTERVAL_1_4;
> + case 128 : return GUARD_INTERVAL_1_128; // DVB-T2
> + case 19128: return GUARD_INTERVAL_19_128; // DVB-T2
> + case 19256: return GUARD_INTERVAL_19_256; // DVB-T2
> default:
> msg_Warn( NULL, "invalid guard interval %d", i_guard );
> + case -2: // DVB-T2 hint
> case -1:
> case 0: return GUARD_INTERVAL_AUTO;
> }
> @@ -669,8 +673,11 @@ static fe_transmit_mode_t GetTransmission(void)
> #ifdef TRANSMISSION_MODE_4K
> case 4: return TRANSMISSION_MODE_4K;
> #endif
> + case 16: return TRANSMISSION_MODE_16K; // DVB-T2
> + case 32: return TRANSMISSION_MODE_32K; // DVB-T2
> default:
> msg_Warn( NULL, "invalid tranmission mode %d", i_transmission );
> + case -2: // DVB-T2 hint
> case -1:
> case 0: return TRANSMISSION_MODE_AUTO;
> }
> @@ -819,6 +826,26 @@ static struct dtv_properties dvbt_cmdseq = {
> .props = dvbt_cmdargs
> };
>
> +static struct dtv_property dvbt2_cmdargs[] = {
> + { .cmd = DTV_FREQUENCY, .u.data = 0 },
> + { .cmd = DTV_MODULATION, .u.data = QAM_AUTO },
> + { .cmd = DTV_INVERSION, .u.data = INVERSION_AUTO },
> + { .cmd = DTV_BANDWIDTH_HZ, .u.data = 8000000 },
> + { .cmd = DTV_CODE_RATE_HP, .u.data = FEC_AUTO },
> + { .cmd = DTV_CODE_RATE_LP, .u.data = FEC_AUTO },
> + { .cmd = DTV_GUARD_INTERVAL, .u.data = GUARD_INTERVAL_AUTO },
> + { .cmd = DTV_TRANSMISSION_MODE,.u.data = TRANSMISSION_MODE_AUTO },
> + { .cmd = DTV_HIERARCHY, .u.data = HIERARCHY_AUTO },
> + { .cmd = DTV_DVBT2_PLP_ID, .u.data = 0 },
> + { .cmd = DTV_DELIVERY_SYSTEM, .u.data = SYS_DVBT2 },
> + { .cmd = DTV_TUNE },
> +};
> +static struct dtv_properties dvbt2_cmdseq = {
> + .num = sizeof(dvbt2_cmdargs)/sizeof(struct dtv_property),
> + .props = dvbt2_cmdargs
> +};
> +
> +
> static struct dtv_property atsc_cmdargs[] = {
> { .cmd = DTV_FREQUENCY, .u.data = 0 },
> { .cmd = DTV_MODULATION, .u.data = QAM_AUTO },
> @@ -843,6 +870,7 @@ static struct dtv_properties atsc_cmdseq = {
> #define TRANSMISSION 7
> #define ROLLOFF 7
> #define HIERARCHY 8
> +#define PLP_ID 9
>
> struct dtv_property pclear[] = {
> { .cmd = DTV_CLEAR },
> @@ -877,7 +905,14 @@ static void FrontendSet( bool b_init )
> switch ( info.type )
> {
> case FE_OFDM:
> - p = &dvbt_cmdseq;
> + if ( i_guard == -2 || i_guard >= 128 || i_transmission == -2 || i_transmission >= 16 )
> + {
> + p = &dvbt2_cmdseq;
> + p->props[PLP_ID].u.data = 0;
> + }
> + else
> + p = &dvbt_cmdseq;
> +
> p->props[FREQUENCY].u.data = i_frequency;
> p->props[INVERSION].u.data = GetInversion();
> if ( psz_modulation != NULL )
> diff --git a/dvblast.c b/dvblast.c
> index dd25a40..9d0b711 100644
> --- a/dvblast.c
> +++ b/dvblast.c
> @@ -470,8 +470,12 @@ void usage()
> msg_Raw( NULL, " -K --fec-lp DVB-T low priority FEC (default auto)" );
> msg_Raw( NULL, " -G --guard DVB-T guard interval" );
> msg_Raw( NULL, " DVB-T 32 (1/32)|16 (1/16)|8 (1/8)|4 (1/4)|-1 (auto, default)" );
> + msg_Raw( NULL, " DVB-T2 32 (1/32)|16 (1/16)|8 (1/8)|4 (1/4)|-2 (auto, default)" );
> + msg_Raw( NULL, " DVB-T2 128 (1/128)|19128 (19/128)|19256 (19/256)|-2 (auto, default)" );
> msg_Raw( NULL, " -H --hierarchy DVB-T hierarchy (0, 1, 2, 4 or -1 auto, default)" );
> - msg_Raw( NULL, " -X --transmission DVB-T transmission (2, 4, 8 or -1 auto, default)" );
> + msg_Raw( NULL, " -X --transmission DVB-T transmission mode" );
> + msg_Raw( NULL, " DVB-T 2, 4, 8 (default: -1 = auto)" );
> + msg_Raw( NULL, " DVB-T2 2, 4, 8, 16, 32 (default: -2 = auto)" );
> msg_Raw( NULL, " -s --symbol-rate" );
> msg_Raw( NULL, " -S --diseqc satellite number for diseqc (0: no diseqc, 1-4, A or B)" );
> msg_Raw( NULL, " -u --budget-mode turn on budget mode (no hardware PID filtering)" );
>
> --
> 1.7.5.1
>
> _______________________________________________
> dvblast-devel mailing list
> dvblast-devel at videolan.org
> http://mailman.videolan.org/listinfo/dvblast-devel
More information about the dvblast-devel
mailing list