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[media] dvb: Add DVBv5 statistics properties 

The DVBv3 statistics parameters are limited on several ways:
        - It doesn't provide any way to indicate the used measure,
	  so userspace need to guess how to calculate/use it;
        - Only a limited set of stats are supported;
        - 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.
To address the above issues, adding a new DVBv5-based stats API.
While here, correct inner code nomenclature on a few places.

Reviewed-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2013-01-06 12:22:06 -03:00
parent f167e302c6
commit 9569793a79
5 changed files with 260 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/DocBook/media/dvb/dvbapi.xml
View File

@ -84,7 +84,7 @@ Added ISDB-T test originally written by Patrick Boettcher
<title>LINUX DVB API</title>
<subtitle>Version 5.8</subtitle>
<subtitle>Version 5.10</subtitle>
<!-- ADD THE CHAPTERS HERE -->
<chapter id="dvb_introdution">
&sub-intro;

180
Documentation/DocBook/media/dvb/dvbproperty.xml
View File

@ -7,14 +7,41 @@ the capability ioctls weren't implemented yet via the new way.</para>
<para>The typical usage for the <constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant>
API is to replace the ioctl's were the <link linkend="dvb-frontend-parameters">
struct <constant>dvb_frontend_parameters</constant></link> were used.</para>
<section id="dtv-stats">
<title>DTV stats type</title>
<programlisting>
struct dtv_stats {
__u8 scale; /* enum fecap_scale_params type */
union {
__u64 uvalue; /* for counters and relative scales */
__s64 svalue; /* for 1/1000 dB measures */
};
} __packed;
</programlisting>
</section>
<section id="dtv-fe-stats">
<title>DTV stats type</title>
<programlisting>
#define MAX_DTV_STATS 4
struct dtv_fe_stats {
__u8 len;
struct dtv_stats stat[MAX_DTV_STATS];
} __packed;
</programlisting>
</section>
<section id="dtv-property">
<title>DTV property type</title>
<programlisting>
/* Reserved fields should be set to 0 */
struct dtv_property {
__u32 cmd;
__u32 reserved[3];
union {
__u32 data;
struct dtv_fe_stats st;
struct {
__u8 data[32];
__u32 len;
@ -440,7 +467,7 @@ typedef enum fe_delivery_system {
<title><constant>DTV-ISDBT-LAYER*</constant> parameters</title>
<para>ISDB-T channels can be coded hierarchically. As opposed to DVB-T in
ISDB-T hierarchical layers can be decoded simultaneously. For that
reason a ISDB-T demodulator has 3 viterbi and 3 reed-solomon-decoders.</para>
reason a ISDB-T demodulator has 3 Viterbi and 3 Reed-Solomon decoders.</para>
<para>ISDB-T has 3 hierarchical layers which each can use a part of the
available segments. The total number of segments over all layers has
to 13 in ISDB-T.</para>
@ -850,6 +877,147 @@ enum fe_interleaving {
<para>use the special macro LNA_AUTO to set LNA auto</para>
</section>
</section>
<section id="frontend-stat-properties">
<title>Frontend statistics indicators</title>
<para>The values are returned via <constant>dtv_property.stat</constant>.
If the property is supported, <constant>dtv_property.stat.len</constant> is bigger than zero.</para>
<para>For most delivery systems, <constant>dtv_property.stat.len</constant>
will be 1 if the stats is supported, and the properties will
return a single value for each parameter.</para>
<para>It should be noticed, however, that new OFDM delivery systems
like ISDB can use different modulation types for each group of
carriers. On such standards, up to 3 groups of statistics can be
provided, and <constant>dtv_property.stat.len</constant> is updated
to reflect the "global" metrics, plus one metric per each carrier
group (called "layer" on ISDB).</para>
<para>So, in order to be consistent with other delivery systems, the first
value at <link linkend="dtv-stats"><constant>dtv_property.stat.dtv_stats</constant></link>
array refers to the global metric. The other elements of the array
represent each layer, starting from layer A(index 1),
layer B (index 2) and so on.</para>
<para>The number of filled elements are stored at <constant>dtv_property.stat.len</constant>.</para>
<para>Each element of the <constant>dtv_property.stat.dtv_stats</constant> array consists on two elements:</para>
<itemizedlist mark='opencircle'>
<listitem><para><constant>svalue</constant> or <constant>uvalue</constant>, where
<constant>svalue</constant> is for signed values of the measure (dB measures)
and <constant>uvalue</constant> is for unsigned values (counters, relative scale)</para></listitem>
<listitem><para><constant>scale</constant> - Scale for the value. It can be:</para>
<section id = "fecap-scale-params">
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - The parameter is supported by the frontend, but it was not possible to collect it (could be a transitory or permanent condition)</para></listitem>
<listitem><para><constant>FE_SCALE_DECIBEL</constant> - parameter is a signed value, measured in 1/1000 dB</para></listitem>
<listitem><para><constant>FE_SCALE_RELATIVE</constant> - parameter is a unsigned value, where 0 means 0% and 65535 means 100%.</para></listitem>
<listitem><para><constant>FE_SCALE_COUNTER</constant> - parameter is a unsigned value that counts the occurrence of an event, like bit error, block error, or lapsed time.</para></listitem>
</itemizedlist>
</section>
</listitem>
</itemizedlist>
<section id="DTV-STAT-SIGNAL-STRENGTH">
<title><constant>DTV_STAT_SIGNAL_STRENGTH</constant></title>
<para>Indicates the signal strength level at the analog part of the tuner or of the demod.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</listitem>
<listitem><constant>FE_SCALE_DECIBEL</constant> - signal strength is in 0.0001 dBm units, power measured in miliwatts. This value is generally negative.</listitem>
<listitem><constant>FE_SCALE_RELATIVE</constant> - The frontend provides a 0% to 100% measurement for power (actually, 0 to 65535).</listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-CNR">
<title><constant>DTV_STAT_CNR</constant></title>
<para>Indicates the Signal to Noise ratio for the main carrier.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</listitem>
<listitem><constant>FE_SCALE_DECIBEL</constant> - Signal/Noise ratio is in 0.0001 dB units.</listitem>
<listitem><constant>FE_SCALE_RELATIVE</constant> - The frontend provides a 0% to 100% measurement for Signal/Noise (actually, 0 to 65535).</listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-PRE-ERROR-BIT-COUNT">
<title><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></title>
<para>Measures the number of bit errors before the forward error correction (FEC) on the inner coding block (before Viterbi, LDPC or other inner code).</para>
<para>This measure is taken during the same interval as <constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant>.</para>
<para>In order to get the BER (Bit Error Rate) measurement, it should be divided by
<link linkend="DTV-STAT-PRE-TOTAL-BIT-COUNT"><constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant></link>.</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</listitem>
<listitem><constant>FE_SCALE_COUNTER</constant> - Number of error bits counted before the inner coding.</listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-PRE-TOTAL-BIT-COUNT">
<title><constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant></title>
<para>Measures the amount of bits received before the inner code block, during the same period as
<link linkend="DTV-STAT-PRE-ERROR-BIT-COUNT"><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></link> measurement was taken.</para>
<para>It should be noticed that this measurement can be smaller than the total amount of bits on the transport stream,
as the frontend may need to manually restart the measurement, loosing some data between each measurement interval.</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</listitem>
<listitem><constant>FE_SCALE_COUNTER</constant> - Number of bits counted while measuring
<link linkend="DTV-STAT-PRE-ERROR-BIT-COUNT"><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></link>.</listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-POST-ERROR-BIT-COUNT">
<title><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></title>
<para>Measures the number of bit errors after the forward error correction (FEC) done by inner code block (after Viterbi, LDPC or other inner code).</para>
<para>This measure is taken during the same interval as <constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant>.</para>
<para>In order to get the BER (Bit Error Rate) measurement, it should be divided by
<link linkend="DTV-STAT-POST-TOTAL-BIT-COUNT"><constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant></link>.</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</listitem>
<listitem><constant>FE_SCALE_COUNTER</constant> - Number of error bits counted after the inner coding.</listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-POST-TOTAL-BIT-COUNT">
<title><constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant></title>
<para>Measures the amount of bits received after the inner coding, during the same period as
<link linkend="DTV-STAT-POST-ERROR-BIT-COUNT"><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></link> measurement was taken.</para>
<para>It should be noticed that this measurement can be smaller than the total amount of bits on the transport stream,
as the frontend may need to manually restart the measurement, loosing some data between each measurement interval.</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</listitem>
<listitem><constant>FE_SCALE_COUNTER</constant> - Number of bits counted while measuring
<link linkend="DTV-STAT-POST-ERROR-BIT-COUNT"><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></link>.</listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-ERROR-BLOCK-COUNT">
<title><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></title>
<para>Measures the number of block errors after the outer forward error correction coding (after Reed-Solomon or other outer code).</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</listitem>
<listitem><constant>FE_SCALE_COUNTER</constant> - Number of error blocks counted after the outer coding.</listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-TOTAL-BLOCK-COUNT">
<title><constant>DTV-STAT_TOTAL_BLOCK_COUNT</constant></title>
<para>Measures the total number of blocks received during the same period as
<link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link> measurement was taken.</para>
<para>It can be used to calculate the PER indicator, by dividing
<link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link>
by <link linkend="DTV-STAT-TOTAL-BLOCK-COUNT"><constant>DTV-STAT-TOTAL-BLOCK-COUNT</constant></link>.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</listitem>
<listitem><constant>FE_SCALE_COUNTER</constant> - Number of blocks counted while measuring
<link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link>.</listitem>
</itemizedlist>
</section>
</section>
<section id="frontend-property-terrestrial-systems">
<title>Properties used on terrestrial delivery systems</title>
<section id="dvbt-params">
@ -871,6 +1039,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-HIERARCHY"><constant>DTV_HIERARCHY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="dvbt2-params">
<title>DVB-T2 delivery system</title>
@ -895,6 +1064,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-STREAM-ID"><constant>DTV_STREAM_ID</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="isdbt">
<title>ISDB-T delivery system</title>
@ -948,6 +1118,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-ISDBT-LAYER-SEGMENT-COUNT"><constant>DTV_ISDBT_LAYERC_SEGMENT_COUNT</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-TIME-INTERLEAVING"><constant>DTV_ISDBT_LAYERC_TIME_INTERLEAVING</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="atsc-params">
<title>ATSC delivery system</title>
@ -961,6 +1132,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="atscmh-params">
<title>ATSC-MH delivery system</title>
@ -988,6 +1160,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-C"><constant>DTV_ATSCMH_SCCC_CODE_MODE_C</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-D"><constant>DTV_ATSCMH_SCCC_CODE_MODE_D</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="dtmb-params">
<title>DTMB delivery system</title>
@ -1007,6 +1180,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-INTERLEAVING"><constant>DTV_INTERLEAVING</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
</section>
<section id="frontend-property-cable-systems">
@ -1028,6 +1202,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="dvbc-annex-b-params">
<title>DVB-C Annex B delivery system</title>
@ -1043,6 +1218,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
</section>
<section id="frontend-property-satellital-systems">
@ -1062,6 +1238,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-VOLTAGE"><constant>DTV_VOLTAGE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TONE"><constant>DTV_TONE</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
<para>Future implementations might add those two missing parameters:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-DISEQC-MASTER"><constant>DTV_DISEQC_MASTER</constant></link></para></listitem>
@ -1077,6 +1254,7 @@ enum fe_interleaving {
<listitem><para><link linkend="DTV-ROLLOFF"><constant>DTV_ROLLOFF</constant></link></para></listitem>
<listitem><para><link linkend="DTV-STREAM-ID"><constant>DTV_STREAM_ID</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="turbo-params">
<title>Turbo code delivery system</title>

2
Documentation/DocBook/media/dvb/frontend.xml
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@ -230,7 +230,7 @@ typedef enum fe_status {
<entry align="char">The frontend has found a DVB signal</entry>
</row><row>
<entry align="char">FE_HAS_VITERBI</entry>
<entry align="char">The frontend FEC code is stable</entry>
<entry align="char">The frontend FEC inner coding (Viterbi, LDPC or other inner code) is stable</entry>
</row><row>
<entry align="char">FE_HAS_SYNC</entry>
<entry align="char">Syncronization bytes was found</entry>

79
include/uapi/linux/dvb/frontend.h
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@ -365,7 +365,17 @@ struct dvb_frontend_event {
#define DTV_INTERLEAVING 60
#define DTV_LNA 61
#define DTV_MAX_COMMAND DTV_LNA
/* Quality parameters */
#define DTV_STAT_SIGNAL_STRENGTH 62
#define DTV_STAT_CNR 63
#define DTV_STAT_PRE_ERROR_BIT_COUNT 64
#define DTV_STAT_PRE_TOTAL_BIT_COUNT 65
#define DTV_STAT_POST_ERROR_BIT_COUNT 66
#define DTV_STAT_POST_TOTAL_BIT_COUNT 67
#define DTV_STAT_ERROR_BLOCK_COUNT 68
#define DTV_STAT_TOTAL_BLOCK_COUNT 69
#define DTV_MAX_COMMAND DTV_STAT_TOTAL_BLOCK_COUNT
typedef enum fe_pilot {
PILOT_ON,
@ -452,11 +462,78 @@ struct dtv_cmds_h {
__u32 reserved:30; /* Align */
};
/**
* Scale types for the quality parameters.
* @FE_SCALE_NOT_AVAILABLE: That QoS measure is not available. That
* could indicate a temporary or a permanent
* condition.
* @FE_SCALE_DECIBEL: The scale is measured in 0.0001 dB steps, typically
* used on signal measures.
* @FE_SCALE_RELATIVE: The scale is a relative percentual measure,
* ranging from 0 (0%) to 0xffff (100%).
* @FE_SCALE_COUNTER: The scale counts the occurrence of an event, like
* bit error, block error, lapsed time.
*/
enum fecap_scale_params {
FE_SCALE_NOT_AVAILABLE = 0,
FE_SCALE_DECIBEL,
FE_SCALE_RELATIVE,
FE_SCALE_COUNTER
};
/**
* struct dtv_stats - Used for reading a DTV status property
*
* @value: value of the measure. Should range from 0 to 0xffff;
* @scale: Filled with enum fecap_scale_params - the scale
* in usage for that parameter
*
* For most delivery systems, this will return a single value for each
* parameter.
* It should be noticed, however, that new OFDM delivery systems like
* ISDB can use different modulation types for each group of carriers.
* On such standards, up to 8 groups of statistics can be provided, one
* for each carrier group (called "layer" on ISDB).
* In order to be consistent with other delivery systems, the first
* value refers to the entire set of carriers ("global").
* dtv_status:scale should use the value FE_SCALE_NOT_AVAILABLE when
* the value for the entire group of carriers or from one specific layer
* is not provided by the hardware.
* st.len should be filled with the latest filled status + 1.
*
* In other words, for ISDB, those values should be filled like:
* u.st.stat.svalue[0] = global statistics;
* u.st.stat.scale[0] = FE_SCALE_DECIBELS;
* u.st.stat.value[1] = layer A statistics;
* u.st.stat.scale[1] = FE_SCALE_NOT_AVAILABLE (if not available);
* u.st.stat.svalue[2] = layer B statistics;
* u.st.stat.scale[2] = FE_SCALE_DECIBELS;
* u.st.stat.svalue[3] = layer C statistics;
* u.st.stat.scale[3] = FE_SCALE_DECIBELS;
* u.st.len = 4;
*/
struct dtv_stats {
__u8 scale; /* enum fecap_scale_params type */
union {
__u64 uvalue; /* for counters and relative scales */
__s64 svalue; /* for 0.0001 dB measures */
};
} __attribute__ ((packed));
#define MAX_DTV_STATS 4
struct dtv_fe_stats {
__u8 len;
struct dtv_stats stat[MAX_DTV_STATS];
} __attribute__ ((packed));
struct dtv_property {
__u32 cmd;
__u32 reserved[3];
union {
__u32 data;
struct dtv_fe_stats st;
struct {
__u8 data[32];
__u32 len;

2
include/uapi/linux/dvb/version.h
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@ -24,6 +24,6 @@
#define _DVBVERSION_H_
#define DVB_API_VERSION 5
#define DVB_API_VERSION_MINOR 9
#define DVB_API_VERSION_MINOR 10
#endif /*_DVBVERSION_H_*/