591 lines
20 KiB
XML
591 lines
20 KiB
XML
<section id="FE_GET_SET_PROPERTY">
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<title>FE_GET_PROPERTY/FE_SET_PROPERTY</title>
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<programlisting>
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/* Reserved fields should be set to 0 */
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struct dtv_property {
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__u32 cmd;
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union {
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__u32 data;
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struct {
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__u8 data[32];
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__u32 len;
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__u32 reserved1[3];
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void *reserved2;
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} buffer;
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} u;
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int result;
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} __attribute__ ((packed));
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/* num of properties cannot exceed DTV_IOCTL_MAX_MSGS per ioctl */
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#define DTV_IOCTL_MAX_MSGS 64
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struct dtv_properties {
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__u32 num;
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struct dtv_property *props;
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};
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</programlisting>
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<section id="FE_GET_PROPERTY">
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<title>FE_GET_PROPERTY</title>
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<para>DESCRIPTION
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>This ioctl call returns one or more frontend properties. This call only
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requires read-only access to the device.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>SYNOPSIS
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>int ioctl(int fd, int request = <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link>,
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dtv_properties ⋆props);</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>PARAMETERS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry align="char">
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<para>int fd</para>
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</entry><entry
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align="char">
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<para>File descriptor returned by a previous call to open().</para>
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</entry>
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</row><row><entry
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align="char">
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<para>int num</para>
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</entry><entry
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align="char">
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<para>Equals <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link> for this command.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>struct dtv_property *props</para>
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</entry><entry
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align="char">
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<para>Points to the location where the front-end property commands are stored.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>ERRORS</para>
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<informaltable><tgroup cols="2"><tbody><row>
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<entry align="char"><para>EINVAL</para></entry>
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<entry align="char"><para>Invalid parameter(s) received or number of parameters out of the range.</para></entry>
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</row><row>
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<entry align="char"><para>ENOMEM</para></entry>
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<entry align="char"><para>Out of memory.</para></entry>
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</row><row>
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<entry align="char"><para>EFAULT</para></entry>
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<entry align="char"><para>Failure while copying data from/to userspace.</para></entry>
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</row><row>
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<entry align="char"><para>EOPNOTSUPP</para></entry>
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<entry align="char"><para>Property type not supported.</para></entry>
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</row></tbody></tgroup></informaltable>
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</section>
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<section id="FE_SET_PROPERTY">
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<title>FE_SET_PROPERTY</title>
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<para>DESCRIPTION
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>This ioctl call sets one or more frontend properties. This call only
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requires read-only access to the device.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>SYNOPSIS
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>int ioctl(int fd, int request = <link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link>,
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dtv_properties ⋆props);</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>PARAMETERS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry align="char">
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<para>int fd</para>
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</entry><entry
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align="char">
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<para>File descriptor returned by a previous call to open().</para>
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</entry>
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</row><row><entry
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align="char">
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<para>int num</para>
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</entry><entry
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align="char">
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<para>Equals <link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link> for this command.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>struct dtv_property *props</para>
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</entry><entry
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align="char">
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<para>Points to the location where the front-end property commands are stored.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>ERRORS
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</para>
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<informaltable><tgroup cols="2"><tbody><row>
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<entry align="char"><para>EINVAL</para></entry>
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<entry align="char"><para>Invalid parameter(s) received or number of parameters out of the range.</para></entry>
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</row><row>
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<entry align="char"><para>ENOMEM</para></entry>
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<entry align="char"><para>Out of memory.</para></entry>
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</row><row>
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<entry align="char"><para>EFAULT</para></entry>
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<entry align="char"><para>Failure while copying data from/to userspace.</para></entry>
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</row><row>
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<entry align="char"><para>EOPNOTSUPP</para></entry>
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<entry align="char"><para>Property type not supported.</para></entry>
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</row></tbody></tgroup></informaltable>
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</section>
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<section>
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<title>Property types</title>
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<para>
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On <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link>/<link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link>,
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the actual action is determined by the dtv_property cmd/data pairs. With one single ioctl, is possible to
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get/set up to 64 properties. The actual meaning of each property is described on the next sections.
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</para>
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<para>The available frontend property types are:</para>
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<programlisting>
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#define DTV_UNDEFINED 0
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#define DTV_TUNE 1
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#define DTV_CLEAR 2
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#define DTV_FREQUENCY 3
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#define DTV_MODULATION 4
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#define DTV_BANDWIDTH_HZ 5
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#define DTV_INVERSION 6
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#define DTV_DISEQC_MASTER 7
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#define DTV_SYMBOL_RATE 8
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#define DTV_INNER_FEC 9
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#define DTV_VOLTAGE 10
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#define DTV_TONE 11
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#define DTV_PILOT 12
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#define DTV_ROLLOFF 13
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#define DTV_DISEQC_SLAVE_REPLY 14
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#define DTV_FE_CAPABILITY_COUNT 15
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#define DTV_FE_CAPABILITY 16
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#define DTV_DELIVERY_SYSTEM 17
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#define DTV_ISDBT_PARTIAL_RECEPTION 18
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#define DTV_ISDBT_SOUND_BROADCASTING 19
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#define DTV_ISDBT_SB_SUBCHANNEL_ID 20
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#define DTV_ISDBT_SB_SEGMENT_IDX 21
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#define DTV_ISDBT_SB_SEGMENT_COUNT 22
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#define DTV_ISDBT_LAYERA_FEC 23
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#define DTV_ISDBT_LAYERA_MODULATION 24
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#define DTV_ISDBT_LAYERA_SEGMENT_COUNT 25
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#define DTV_ISDBT_LAYERA_TIME_INTERLEAVING 26
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#define DTV_ISDBT_LAYERB_FEC 27
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#define DTV_ISDBT_LAYERB_MODULATION 28
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#define DTV_ISDBT_LAYERB_SEGMENT_COUNT 29
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#define DTV_ISDBT_LAYERB_TIME_INTERLEAVING 30
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#define DTV_ISDBT_LAYERC_FEC 31
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#define DTV_ISDBT_LAYERC_MODULATION 32
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#define DTV_ISDBT_LAYERC_SEGMENT_COUNT 33
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#define DTV_ISDBT_LAYERC_TIME_INTERLEAVING 34
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#define DTV_API_VERSION 35
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#define DTV_CODE_RATE_HP 36
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#define DTV_CODE_RATE_LP 37
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#define DTV_GUARD_INTERVAL 38
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#define DTV_TRANSMISSION_MODE 39
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#define DTV_HIERARCHY 40
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#define DTV_ISDBT_LAYER_ENABLED 41
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#define DTV_ISDBS_TS_ID 42
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</programlisting>
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</section>
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<section id="fe_property_common">
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<title>Parameters that are common to all Digital TV standards</title>
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<section id="DTV_FREQUENCY">
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<title><constant>DTV_FREQUENCY</constant></title>
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<para>Central frequency of the channel, in HZ.</para>
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<para>Notes:</para>
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<para>1)For ISDB-T, the channels are usually transmitted with an offset of 143kHz.
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E.g. a valid frequncy could be 474143 kHz. The stepping is bound to the bandwidth of
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the channel which is 6MHz.</para>
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<para>2)As in ISDB-Tsb the channel consists of only one or three segments the
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frequency step is 429kHz, 3*429 respectively. As for ISDB-T the
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central frequency of the channel is expected.</para>
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</section>
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<section id="DTV_BANDWIDTH_HZ">
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<title><constant>DTV_BANDWIDTH_HZ</constant></title>
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<para>Bandwidth for the channel, in HZ.</para>
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<para>Possible values:
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<constant>1712000</constant>,
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<constant>5000000</constant>,
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<constant>6000000</constant>,
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<constant>7000000</constant>,
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<constant>8000000</constant>,
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<constant>10000000</constant>.
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</para>
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<para>Notes:</para>
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<para>1) For ISDB-T it should be always 6000000Hz (6MHz)</para>
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<para>2) For ISDB-Tsb it can vary depending on the number of connected segments</para>
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<para>3) Bandwidth doesn't apply for DVB-C transmissions, as the bandwidth
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for DVB-C depends on the symbol rate</para>
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<para>4) Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from
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other parameters (DTV_ISDBT_SB_SEGMENT_IDX,
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DTV_ISDBT_SB_SEGMENT_COUNT).</para>
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<para>5) DVB-T supports 6, 7 and 8MHz.</para>
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<para>6) In addition, DVB-T2 supports 1.172, 5 and 10MHz.</para>
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</section>
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<section id="DTV_DELIVERY_SYSTEM">
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<title><constant>DTV_DELIVERY_SYSTEM</constant></title>
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<para>Specifies the type of Delivery system</para>
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<para>Possible values: </para>
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<programlisting>
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typedef enum fe_delivery_system {
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SYS_UNDEFINED,
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SYS_DVBC_ANNEX_AC,
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SYS_DVBC_ANNEX_B,
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SYS_DVBT,
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SYS_DSS,
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SYS_DVBS,
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SYS_DVBS2,
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SYS_DVBH,
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SYS_ISDBT,
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SYS_ISDBS,
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SYS_ISDBC,
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SYS_ATSC,
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SYS_ATSCMH,
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SYS_DMBTH,
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SYS_CMMB,
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SYS_DAB,
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SYS_DVBT2,
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} fe_delivery_system_t;
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</programlisting>
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</section>
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<section id="DTV_TRANSMISSION_MODE">
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<title><constant>DTV_TRANSMISSION_MODE</constant></title>
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<para>Specifies the number of carriers used by the standard</para>
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<para>Possible values are:</para>
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<programlisting>
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typedef enum fe_transmit_mode {
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TRANSMISSION_MODE_2K,
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TRANSMISSION_MODE_8K,
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TRANSMISSION_MODE_AUTO,
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TRANSMISSION_MODE_4K,
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TRANSMISSION_MODE_1K,
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TRANSMISSION_MODE_16K,
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TRANSMISSION_MODE_32K,
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} fe_transmit_mode_t;
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</programlisting>
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<para>Notes:</para>
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<para>1) ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called
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'mode' in the standard: Mode 1 is 2K, mode 2 is 4K, mode 3 is 8K</para>
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<para>2) If <constant>DTV_TRANSMISSION_MODE</constant> is set the <constant>TRANSMISSION_MODE_AUTO</constant> the
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hardware will try to find the correct FFT-size (if capable) and will
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use TMCC to fill in the missing parameters.</para>
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<para>3) DVB-T specifies 2K and 8K as valid sizes.</para>
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<para>4) DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K.</para>
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</section>
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<section id="DTV_GUARD_INTERVAL">
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<title><constant>DTV_GUARD_INTERVAL</constant></title>
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<para>Possible values are:</para>
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<programlisting>
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typedef enum fe_guard_interval {
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GUARD_INTERVAL_1_32,
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GUARD_INTERVAL_1_16,
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GUARD_INTERVAL_1_8,
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GUARD_INTERVAL_1_4,
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GUARD_INTERVAL_AUTO,
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GUARD_INTERVAL_1_128,
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GUARD_INTERVAL_19_128,
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GUARD_INTERVAL_19_256,
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} fe_guard_interval_t;
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</programlisting>
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<para>Notes:</para>
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<para>1) If <constant>DTV_GUARD_INTERVAL</constant> is set the <constant>GUARD_INTERVAL_AUTO</constant> the hardware will
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try to find the correct guard interval (if capable) and will use TMCC to fill
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in the missing parameters.</para>
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<para>2) Intervals 1/128, 19/128 and 19/256 are used only for DVB-T2 at present</para>
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</section>
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</section>
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<section id="isdbt">
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<title>ISDB-T frontend</title>
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<para>This section describes shortly what are the possible parameters in the Linux
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DVB-API called "S2API" and now DVB API 5 in order to tune an ISDB-T/ISDB-Tsb
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demodulator:</para>
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<para>This ISDB-T/ISDB-Tsb API extension should reflect all information
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needed to tune any ISDB-T/ISDB-Tsb hardware. Of course it is possible
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that some very sophisticated devices won't need certain parameters to
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tune.</para>
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<para>The information given here should help application writers to know how
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to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API.</para>
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<para>The details given here about ISDB-T and ISDB-Tsb are just enough to
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basically show the dependencies between the needed parameter values,
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but surely some information is left out. For more detailed information
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see the following documents:</para>
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<para>ARIB STD-B31 - "Transmission System for Digital Terrestrial
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Television Broadcasting" and</para>
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<para>ARIB TR-B14 - "Operational Guidelines for Digital Terrestrial
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Television Broadcasting".</para>
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<para>In order to read this document one has to have some knowledge the
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channel structure in ISDB-T and ISDB-Tsb. I.e. it has to be known to
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the reader that an ISDB-T channel consists of 13 segments, that it can
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have up to 3 layer sharing those segments, and things like that.</para>
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<para>Parameters used by ISDB-T and ISDB-Tsb.</para>
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<section id="isdbt-new-parms">
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<title>ISDB-T only parameters</title>
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<section id="isdbt-part-rec">
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<title><constant>DTV_ISDBT_PARTIAL_RECEPTION</constant></title>
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<para><constant>If DTV_ISDBT_SOUND_BROADCASTING</constant> is '0' this bit-field represents whether
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the channel is in partial reception mode or not.</para>
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<para>If '1' <constant>DTV_ISDBT_LAYERA_*</constant> values are assigned to the center segment and
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<constant>DTV_ISDBT_LAYERA_SEGMENT_COUNT</constant> has to be '1'.</para>
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<para>If in addition <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'
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<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> represents whether this ISDB-Tsb channel
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is consisting of one segment and layer or three segments and two layers.</para>
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<para>Possible values: 0, 1, -1 (AUTO)</para>
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</section>
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<section id="isdbt-sound-bcast">
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<title><constant>DTV_ISDBT_SOUND_BROADCASTING</constant></title>
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<para>This field represents whether the other DTV_ISDBT_*-parameters are
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referring to an ISDB-T and an ISDB-Tsb channel. (See also
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<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>).</para>
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<para>Possible values: 0, 1, -1 (AUTO)</para>
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</section>
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<section id="isdbt-sb-ch-id">
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<title><constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant></title>
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<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
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<para>(Note of the author: This might not be the correct description of the
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<constant>SUBCHANNEL-ID</constant> in all details, but it is my understanding of the technical
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background needed to program a device)</para>
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<para>An ISDB-Tsb channel (1 or 3 segments) can be broadcasted alone or in a
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set of connected ISDB-Tsb channels. In this set of channels every
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channel can be received independently. The number of connected
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ISDB-Tsb segment can vary, e.g. depending on the frequency spectrum
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bandwidth available.</para>
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<para>Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The
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broadcaster has several possibilities to put those channels in the
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air: Assuming a normal 13-segment ISDB-T spectrum he can align the 8
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segments from position 1-8 to 5-13 or anything in between.</para>
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<para>The underlying layer of segments are subchannels: each segment is
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consisting of several subchannels with a predefined IDs. A sub-channel
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is used to help the demodulator to synchronize on the channel.</para>
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<para>An ISDB-T channel is always centered over all sub-channels. As for
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the example above, in ISDB-Tsb it is no longer as simple as that.</para>
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<para><constant>The DTV_ISDBT_SB_SUBCHANNEL_ID</constant> parameter is used to give the
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sub-channel ID of the segment to be demodulated.</para>
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<para>Possible values: 0 .. 41, -1 (AUTO)</para>
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</section>
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<section id="isdbt-sb-seg-idx">
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<title><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant></title>
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<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
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<para><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant> gives the index of the segment to be
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demodulated for an ISDB-Tsb channel where several of them are
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transmitted in the connected manner.</para>
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<para>Possible values: 0 .. <constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> - 1</para>
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<para>Note: This value cannot be determined by an automatic channel search.</para>
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</section>
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<section id="isdbt-sb-seg-cnt">
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<title><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant></title>
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<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
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<para><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> gives the total count of connected ISDB-Tsb
|
|
channels.</para>
|
|
|
|
<para>Possible values: 1 .. 13</para>
|
|
|
|
<para>Note: This value cannot be determined by an automatic channel search.</para>
|
|
</section>
|
|
|
|
<section id="isdb-hierq-layers">
|
|
<title>Hierarchical layers</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>
|
|
|
|
<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>
|
|
|
|
<section id="isdbt-layer-ena">
|
|
<title><constant>DTV_ISDBT_LAYER_ENABLED</constant></title>
|
|
|
|
<para>Hierarchical reception in ISDB-T is achieved by enabling or disabling
|
|
layers in the decoding process. Setting all bits of
|
|
<constant>DTV_ISDBT_LAYER_ENABLED</constant> to '1' forces all layers (if applicable) to be
|
|
demodulated. This is the default.</para>
|
|
|
|
<para>If the channel is in the partial reception mode
|
|
(<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> = 1) the central segment can be decoded
|
|
independently of the other 12 segments. In that mode layer A has to
|
|
have a <constant>SEGMENT_COUNT</constant> of 1.</para>
|
|
|
|
<para>In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb
|
|
according to <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>. <constant>SEGMENT_COUNT</constant> must be filled
|
|
accordingly.</para>
|
|
|
|
<para>Possible values: 0x1, 0x2, 0x4 (|-able)</para>
|
|
|
|
<para><constant>DTV_ISDBT_LAYER_ENABLED[0:0]</constant> - layer A</para>
|
|
<para><constant>DTV_ISDBT_LAYER_ENABLED[1:1]</constant> - layer B</para>
|
|
<para><constant>DTV_ISDBT_LAYER_ENABLED[2:2]</constant> - layer C</para>
|
|
<para><constant>DTV_ISDBT_LAYER_ENABLED[31:3]</constant> unused</para>
|
|
</section>
|
|
|
|
<section id="isdbt-layer-fec">
|
|
<title><constant>DTV_ISDBT_LAYER*_FEC</constant></title>
|
|
|
|
<para>Possible values: <constant>FEC_AUTO</constant>, <constant>FEC_1_2</constant>, <constant>FEC_2_3</constant>, <constant>FEC_3_4</constant>, <constant>FEC_5_6</constant>, <constant>FEC_7_8</constant></para>
|
|
</section>
|
|
|
|
<section id="isdbt-layer-mod">
|
|
<title><constant>DTV_ISDBT_LAYER*_MODULATION</constant></title>
|
|
|
|
<para>Possible values: <constant>QAM_AUTO</constant>, QP<constant>SK, QAM_16</constant>, <constant>QAM_64</constant>, <constant>DQPSK</constant></para>
|
|
|
|
<para>Note: If layer C is <constant>DQPSK</constant> layer B has to be <constant>DQPSK</constant>. If layer B is <constant>DQPSK</constant>
|
|
and <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>=0 layer has to be <constant>DQPSK</constant>.</para>
|
|
</section>
|
|
|
|
<section id="isdbt-layer-seg-cnt">
|
|
<title><constant>DTV_ISDBT_LAYER*_SEGMENT_COUNT</constant></title>
|
|
|
|
<para>Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO)</para>
|
|
|
|
<para>Note: Truth table for <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> and
|
|
<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> and <constant>LAYER</constant>*_SEGMENT_COUNT</para>
|
|
|
|
<informaltable id="isdbt-layer_seg-cnt-table">
|
|
<tgroup cols="6">
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry>PR</entry>
|
|
<entry>SB</entry>
|
|
<entry>Layer A width</entry>
|
|
<entry>Layer B width</entry>
|
|
<entry>Layer C width</entry>
|
|
<entry>total width</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>0</entry>
|
|
<entry>0</entry>
|
|
<entry>1 .. 13</entry>
|
|
<entry>1 .. 13</entry>
|
|
<entry>1 .. 13</entry>
|
|
<entry>13</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>1</entry>
|
|
<entry>0</entry>
|
|
<entry>1</entry>
|
|
<entry>1 .. 13</entry>
|
|
<entry>1 .. 13</entry>
|
|
<entry>13</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>0</entry>
|
|
<entry>1</entry>
|
|
<entry>1</entry>
|
|
<entry>0</entry>
|
|
<entry>0</entry>
|
|
<entry>1</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry>1</entry>
|
|
<entry>1</entry>
|
|
<entry>1</entry>
|
|
<entry>2</entry>
|
|
<entry>0</entry>
|
|
<entry>13</entry>
|
|
</row>
|
|
</tbody>
|
|
|
|
</tgroup>
|
|
</informaltable>
|
|
|
|
</section>
|
|
|
|
<section id="isdbt_layer_t_interl">
|
|
<title><constant>DTV_ISDBT_LAYER*_TIME_INTERLEAVING</constant></title>
|
|
|
|
<para>Possible values: 0, 1, 2, 3, -1 (AUTO)</para>
|
|
|
|
<para>Note: The real inter-leaver depth-names depend on the mode (fft-size); the values
|
|
here are referring to what can be found in the TMCC-structure -
|
|
independent of the mode.</para>
|
|
</section>
|
|
</section>
|
|
</section>
|
|
<section id="dvbt2-params">
|
|
<title>DVB-T2 parameters</title>
|
|
|
|
<para>This section covers parameters that apply only to the DVB-T2 delivery method. DVB-T2
|
|
support is currently in the early stages development so expect this section to grow
|
|
and become more detailed with time.</para>
|
|
|
|
<section id="dvbt2-plp-id">
|
|
<title><constant>DTV_DVBT2_PLP_ID</constant></title>
|
|
|
|
<para>DVB-T2 supports Physical Layer Pipes (PLP) to allow transmission of
|
|
many data types via a single multiplex. The API will soon support this
|
|
at which point this section will be expanded.</para>
|
|
</section>
|
|
</section>
|
|
</section>
|
|
</section>
|