@@ -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;
@@ -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;
@@ -850,6 +877,118 @@ 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-BIT-ERROR-COUNT">
+ <title><constant>DTV_STAT_BIT_ERROR_COUNT</constant></title>
+ <para>Measures the number of bit errors before Viterbi.</para>
+ <para>This measure is taken during the same interval as <constant>DTV_STAT_TOTAL_BITS_COUNT</constant>.</para>
+ <para>In order to get the BER (Bit Error Rate) measurement, it should be divided by
+ <link linkend="DTV-STAT-TOTAL-BITS-COUNT"><constant>DTV_STAT_TOTAL_BITS_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 Viterbi.</listitem>
+ </itemizedlist>
+ </section>
+ <section id="DTV-STAT-TOTAL-BITS-COUNT">
+ <title><constant>DTV_STAT_TOTAL_BITS_COUNT</constant></title>
+ <para>Measures the amount of bits received before the Viterbi block, during the same period as
+ <link linkend="DTV-STAT-BIT-ERROR-COUNT"><constant>DTV_STAT_BIT_ERROR_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-BIT-ERROR-COUNT"><constant>DTV_STAT_BIT_ERROR_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.</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 Red Salomon.</listitem>
+ </itemizedlist>
+ </section>
+ <section id="DTV-STAT-TOTAL-BLOCKS-COUNT">
+ <title><constant>DTV-STAT_TOTAL_BLOCKS_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-BLOCKS-COUNT"><constant>DTV-STAT-TOTAL-BLOCKS-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 +1010,7 @@ 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 +1035,7 @@ 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 +1089,7 @@ 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 +1103,7 @@ 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 +1131,7 @@ 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 +1151,7 @@ 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 +1173,7 @@ 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 +1189,7 @@ 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 +1209,7 @@ 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 +1225,7 @@ 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>
@@ -365,7 +365,15 @@ 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_BIT_ERROR_COUNT 64
+#define DTV_STAT_TOTAL_BITS_COUNT 65
+#define DTV_STAT_ERROR_BLOCK_COUNT 66
+#define DTV_STAT_TOTAL_BLOCKS_COUNT 67
+
+#define DTV_MAX_COMMAND DTV_STAT_TOTAL_BLOCKS_COUNT
typedef enum fe_pilot {
PILOT_ON,
@@ -452,11 +460,78 @@ 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;
@@ -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_*/
The DVBv3 statistics parameters are limited on several ways: - Doesn't provide any way to indicate the used measure, so userspace need to guess how to calculate the measure; - 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. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> --- v12: minor changes: - documentation improvement; - don't use __packed at the userspace api, as otherwise userspace compilation breaks; - fold version increment patch. Documentation/DocBook/media/dvb/dvbapi.xml | 2 +- Documentation/DocBook/media/dvb/dvbproperty.xml | 149 ++++++++++++++++++++++++ include/uapi/linux/dvb/frontend.h | 77 +++++++++++- include/uapi/linux/dvb/version.h | 2 +- 4 files changed, 227 insertions(+), 3 deletions(-)