| <title>DVB Frontend API</title> |
| |
| <para>The DVB frontend API was designed to support three types of delivery systems:</para> |
| <itemizedlist> |
| <listitem>Terrestrial systems: DVB-T, DVB-T2, ATSC, ATSC M/H, ISDB-T, DVB-H, DTMB, CMMB</listitem> |
| <listitem>Cable systems: DVB-C Annex A/C, ClearQAM (DVB-C Annex B), ISDB-C</listitem> |
| <listitem>Satellital systems: DVB-S, DVB-S2, DVB Turbo, ISDB-S, DSS</listitem> |
| </itemizedlist> |
| <para>The DVB frontend controls several sub-devices including:</para> |
| <itemizedlist> |
| <listitem>Tuner</listitem>, |
| <listitem>Digital TV demodulator</listitem> |
| <listitem>Low noise amplifier (LNA)</listitem> |
| <listitem>Satellite Equipment Control (SEC) hardware (only for Satellite).</listitem> |
| </itemizedlist> |
| <para>The frontend can be accessed through |
| <emphasis role="bold">/dev/dvb/adapter?/frontend?</emphasis>. Data types and |
| ioctl definitions can be accessed by including |
| <emphasis role="bold">linux/dvb/frontend.h</emphasis> in your application. |
| </para> |
| |
| <para>NOTE: Transmission via the internet (DVB-IP) |
| is not yet handled by this API but a future extension is possible.</para> |
| <para>On Satellital systems, the API support for the Satellite Equipment Control |
| (SEC) allows to power control and to send/receive signals to control the |
| antenna subsystem, selecting the polarization and choosing the Intermediate |
| Frequency IF) of the Low Noise Block Converter Feed Horn (LNBf). It |
| supports the DiSEqC and V-SEC protocols. The DiSEqC (digital SEC) |
| specification is available at |
| <ulink url="http://www.eutelsat.com/satellites/4_5_5.html">Eutelsat</ulink>.</para> |
| |
| |
| <section id="query-dvb-frontend-info"> |
| <title>Querying frontend information</title> |
| |
| <para>Information about the frontend can be queried with |
| <link linkend="FE_GET_INFO">FE_GET_INFO</link>.</para> |
| </section> |
| |
| &sub-frontend_get_info; |
| |
| <section id="dvb-fe-read-status"> |
| <title>Querying frontend status</title> |
| |
| <para>Information about the frontend tuner locking status can be queried with |
| <link linkend="FE_READ_STATUS">FE_READ_STATUS</link>.</para> |
| </section> |
| |
| &sub-frontend_read_status; |
| |
| &sub-dvbproperty; |
| |
| <section id="dvb-diseqc-master-cmd"> |
| <title>diseqc master command</title> |
| |
| <para>A message sent from the frontend to DiSEqC capable equipment.</para> |
| <programlisting> |
| struct dvb_diseqc_master_cmd { |
| uint8_t msg [6]; /⋆ { framing, address, command, data[3] } ⋆/ |
| uint8_t msg_len; /⋆ valid values are 3...6 ⋆/ |
| }; |
| </programlisting> |
| </section> |
| |
| <section role="subsection" id="dvb-diseqc-slave-reply"> |
| <title>diseqc slave reply</title> |
| |
| <para>A reply to the frontend from DiSEqC 2.0 capable equipment.</para> |
| <programlisting> |
| struct dvb_diseqc_slave_reply { |
| uint8_t msg [4]; /⋆ { framing, data [3] } ⋆/ |
| uint8_t msg_len; /⋆ valid values are 0...4, 0 means no msg ⋆/ |
| int timeout; /⋆ return from ioctl after timeout ms with ⋆/ |
| }; /⋆ errorcode when no message was received ⋆/ |
| </programlisting> |
| </section> |
| |
| <section id="fe-sec-voltage-t"> |
| <title>diseqc slave reply</title> |
| <para>The voltage is usually used with non-DiSEqC capable LNBs to switch the polarzation |
| (horizontal/vertical). When using DiSEqC epuipment this voltage has to be switched |
| consistently to the DiSEqC commands as described in the DiSEqC spec.</para> |
| <programlisting> |
| typedef enum fe_sec_voltage { |
| SEC_VOLTAGE_13, |
| SEC_VOLTAGE_18 |
| } fe_sec_voltage_t; |
| </programlisting> |
| </section> |
| |
| <section id="fe-sec-tone-mode-t"> |
| <title>SEC continuous tone</title> |
| |
| <para>The continuous 22KHz tone is usually used with non-DiSEqC capable LNBs to switch the |
| high/low band of a dual-band LNB. When using DiSEqC epuipment this voltage has to |
| be switched consistently to the DiSEqC commands as described in the DiSEqC |
| spec.</para> |
| <programlisting> |
| typedef enum fe_sec_tone_mode { |
| SEC_TONE_ON, |
| SEC_TONE_OFF |
| } fe_sec_tone_mode_t; |
| </programlisting> |
| </section> |
| |
| <section id="fe-sec-mini-cmd-t"> |
| <title>SEC tone burst</title> |
| |
| <para>The 22KHz tone burst is usually used with non-DiSEqC capable switches to select |
| between two connected LNBs/satellites. When using DiSEqC epuipment this voltage has to |
| be switched consistently to the DiSEqC commands as described in the DiSEqC |
| spec.</para> |
| <programlisting> |
| typedef enum fe_sec_mini_cmd { |
| SEC_MINI_A, |
| SEC_MINI_B |
| } fe_sec_mini_cmd_t; |
| </programlisting> |
| |
| <para></para> |
| </section> |
| |
| <section id="fe-spectral-inversion-t"> |
| <title>frontend spectral inversion</title> |
| <para>The Inversion field can take one of these values: |
| </para> |
| <programlisting> |
| typedef enum fe_spectral_inversion { |
| INVERSION_OFF, |
| INVERSION_ON, |
| INVERSION_AUTO |
| } fe_spectral_inversion_t; |
| </programlisting> |
| <para>It indicates if spectral inversion should be presumed or not. In the automatic setting |
| (<constant>INVERSION_AUTO</constant>) the hardware will try to figure out the correct setting by |
| itself. |
| </para> |
| </section> |
| |
| <section id="fe-code-rate-t"> |
| <title>frontend code rate</title> |
| <para>The possible values for the <constant>fec_inner</constant> field used on |
| <link linkend="dvb-qpsk-parameters"><constant>struct dvb_qpsk_parameters</constant></link> and |
| <link linkend="dvb-qam-parameters"><constant>struct dvb_qam_parameters</constant></link> are: |
| </para> |
| <programlisting> |
| typedef enum fe_code_rate { |
| FEC_NONE = 0, |
| FEC_1_2, |
| FEC_2_3, |
| FEC_3_4, |
| FEC_4_5, |
| FEC_5_6, |
| FEC_6_7, |
| FEC_7_8, |
| FEC_8_9, |
| FEC_AUTO, |
| FEC_3_5, |
| FEC_9_10, |
| } fe_code_rate_t; |
| </programlisting> |
| <para>which correspond to error correction rates of 1/2, 2/3, etc., no error correction or auto |
| detection. |
| </para> |
| </section> |
| |
| <section id="fe-modulation-t"> |
| <title>frontend modulation type for QAM, OFDM and VSB</title> |
| <para>For cable and terrestrial frontends, e. g. for |
| <link linkend="dvb-qam-parameters"><constant>struct dvb_qpsk_parameters</constant></link>, |
| <link linkend="dvb-ofdm-parameters"><constant>struct dvb_qam_parameters</constant></link> and |
| <link linkend="dvb-vsb-parameters"><constant>struct dvb_qam_parameters</constant></link>, |
| it needs to specify the quadrature modulation mode which can be one of the following: |
| </para> |
| <programlisting> |
| typedef enum fe_modulation { |
| QPSK, |
| QAM_16, |
| QAM_32, |
| QAM_64, |
| QAM_128, |
| QAM_256, |
| QAM_AUTO, |
| VSB_8, |
| VSB_16, |
| PSK_8, |
| APSK_16, |
| APSK_32, |
| DQPSK, |
| } fe_modulation_t; |
| </programlisting> |
| </section> |
| |
| <section> |
| <title>More OFDM parameters</title> |
| |
| <section id="fe-transmit-mode-t"> |
| <title>Number of carriers per channel</title> |
| <programlisting> |
| typedef enum fe_transmit_mode { |
| TRANSMISSION_MODE_2K, |
| TRANSMISSION_MODE_8K, |
| TRANSMISSION_MODE_AUTO, |
| TRANSMISSION_MODE_4K, |
| TRANSMISSION_MODE_1K, |
| TRANSMISSION_MODE_16K, |
| TRANSMISSION_MODE_32K, |
| } fe_transmit_mode_t; |
| </programlisting> |
| </section> |
| |
| <section id="fe-bandwidth-t"> |
| <title>frontend bandwidth</title> |
| <programlisting> |
| typedef enum fe_bandwidth { |
| BANDWIDTH_8_MHZ, |
| BANDWIDTH_7_MHZ, |
| BANDWIDTH_6_MHZ, |
| BANDWIDTH_AUTO, |
| BANDWIDTH_5_MHZ, |
| BANDWIDTH_10_MHZ, |
| BANDWIDTH_1_712_MHZ, |
| } fe_bandwidth_t; |
| </programlisting> |
| </section> |
| |
| <section id="fe-guard-interval-t"> |
| <title>frontend guard inverval</title> |
| <programlisting> |
| typedef enum fe_guard_interval { |
| GUARD_INTERVAL_1_32, |
| GUARD_INTERVAL_1_16, |
| GUARD_INTERVAL_1_8, |
| GUARD_INTERVAL_1_4, |
| GUARD_INTERVAL_AUTO, |
| GUARD_INTERVAL_1_128, |
| GUARD_INTERVAL_19_128, |
| GUARD_INTERVAL_19_256, |
| } fe_guard_interval_t; |
| </programlisting> |
| </section> |
| |
| <section id="fe-hierarchy-t"> |
| <title>frontend hierarchy</title> |
| <programlisting> |
| typedef enum fe_hierarchy { |
| HIERARCHY_NONE, |
| HIERARCHY_1, |
| HIERARCHY_2, |
| HIERARCHY_4, |
| HIERARCHY_AUTO |
| } fe_hierarchy_t; |
| </programlisting> |
| </section> |
| |
| </section> |
| |
| <section id="frontend_fcalls"> |
| <title>Frontend Function Calls</title> |
| |
| <section id="frontend_f_open"> |
| <title>open()</title> |
| <para>DESCRIPTION</para> |
| <informaltable><tgroup cols="1"><tbody><row> |
| <entry align="char"> |
| <para>This system call opens a named frontend device (/dev/dvb/adapter0/frontend0) |
| for subsequent use. Usually the first thing to do after a successful open is to |
| find out the frontend type with <link linkend="FE_GET_INFO">FE_GET_INFO</link>.</para> |
| <para>The device can be opened in read-only mode, which only allows monitoring of |
| device status and statistics, or read/write mode, which allows any kind of use |
| (e.g. performing tuning operations.) |
| </para> |
| <para>In a system with multiple front-ends, it is usually the case that multiple devices |
| cannot be open in read/write mode simultaneously. As long as a front-end |
| device is opened in read/write mode, other open() calls in read/write mode will |
| either fail or block, depending on whether non-blocking or blocking mode was |
| specified. A front-end device opened in blocking mode can later be put into |
| non-blocking mode (and vice versa) using the F_SETFL command of the fcntl |
| system call. This is a standard system call, documented in the Linux manual |
| page for fcntl. When an open() call has succeeded, the device will be ready |
| for use in the specified mode. This implies that the corresponding hardware is |
| powered up, and that other front-ends may have been powered down to make |
| that possible.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>SYNOPSIS</para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int open(const char ⋆deviceName, int flags);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>const char |
| *deviceName</para> |
| </entry><entry |
| align="char"> |
| <para>Name of specific video device.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int flags</para> |
| </entry><entry |
| align="char"> |
| <para>A bit-wise OR of the following flags:</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| </entry><entry |
| align="char"> |
| <para>O_RDONLY read-only access</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| </entry><entry |
| align="char"> |
| <para>O_RDWR read/write access</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| </entry><entry |
| align="char"> |
| <para>O_NONBLOCK open in non-blocking mode</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| </entry><entry |
| align="char"> |
| <para>(blocking mode is the default)</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>RETURN VALUE</para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>ENODEV</para> |
| </entry><entry |
| align="char"> |
| <para>Device driver not loaded/available.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>EINTERNAL</para> |
| </entry><entry |
| align="char"> |
| <para>Internal error.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>EBUSY</para> |
| </entry><entry |
| align="char"> |
| <para>Device or resource busy.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>EINVAL</para> |
| </entry><entry |
| align="char"> |
| <para>Invalid argument.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| </section> |
| |
| <section id="frontend_f_close"> |
| <title>close()</title> |
| <para>DESCRIPTION |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>This system call closes a previously opened front-end device. After closing |
| a front-end device, its corresponding hardware might be powered down |
| automatically.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>SYNOPSIS |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int close(int fd);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>int fd</para> |
| </entry><entry |
| align="char"> |
| <para>File descriptor returned by a previous call to open().</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>RETURN VALUE</para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>EBADF</para> |
| </entry><entry |
| align="char"> |
| <para>fd is not a valid open file descriptor.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| </section> |
| |
| |
| <section id="FE_DISEQC_RESET_OVERLOAD"> |
| <title>FE_DISEQC_RESET_OVERLOAD</title> |
| <para>DESCRIPTION |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>If the bus has been automatically powered off due to power overload, this ioctl |
| call restores the power to the bus. The call requires read/write access to the |
| device. This call has no effect if the device is manually powered off. Not all |
| DVB adapters support this ioctl.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>SYNOPSIS |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int ioctl(int fd, int request = |
| <link linkend="FE_DISEQC_RESET_OVERLOAD">FE_DISEQC_RESET_OVERLOAD</link>);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>int fd</para> |
| </entry><entry |
| align="char"> |
| <para>File descriptor returned by a previous call to open().</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int request</para> |
| </entry><entry |
| align="char"> |
| <para>Equals <link linkend="FE_DISEQC_RESET_OVERLOAD">FE_DISEQC_RESET_OVERLOAD</link> for this |
| command.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| &return-value-dvb; |
| </section> |
| |
| <section id="FE_DISEQC_SEND_MASTER_CMD"> |
| <title>FE_DISEQC_SEND_MASTER_CMD</title> |
| <para>DESCRIPTION |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>This ioctl call is used to send a a DiSEqC command.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>SYNOPSIS |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int ioctl(int fd, int request = |
| <link linkend="FE_DISEQC_SEND_MASTER_CMD">FE_DISEQC_SEND_MASTER_CMD</link>, struct |
| dvb_diseqc_master_cmd ⋆cmd);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>int fd</para> |
| </entry><entry |
| align="char"> |
| <para>File descriptor returned by a previous call to open().</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int request</para> |
| </entry><entry |
| align="char"> |
| <para>Equals <link linkend="FE_DISEQC_SEND_MASTER_CMD">FE_DISEQC_SEND_MASTER_CMD</link> for this |
| command.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>struct |
| dvb_diseqc_master_cmd |
| *cmd</para> |
| </entry><entry |
| align="char"> |
| <para>Pointer to the command to be transmitted.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| &return-value-dvb; |
| </section> |
| |
| <section id="FE_DISEQC_RECV_SLAVE_REPLY"> |
| <title>FE_DISEQC_RECV_SLAVE_REPLY</title> |
| <para>DESCRIPTION |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>This ioctl call is used to receive reply to a DiSEqC 2.0 command.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>SYNOPSIS |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int ioctl(int fd, int request = |
| <link linkend="FE_DISEQC_RECV_SLAVE_REPLY">FE_DISEQC_RECV_SLAVE_REPLY</link>, struct |
| dvb_diseqc_slave_reply ⋆reply);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>int fd</para> |
| </entry><entry |
| align="char"> |
| <para>File descriptor returned by a previous call to open().</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int request</para> |
| </entry><entry |
| align="char"> |
| <para>Equals <link linkend="FE_DISEQC_RECV_SLAVE_REPLY">FE_DISEQC_RECV_SLAVE_REPLY</link> for this |
| command.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>struct |
| dvb_diseqc_slave_reply |
| *reply</para> |
| </entry><entry |
| align="char"> |
| <para>Pointer to the command to be received.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| &return-value-dvb; |
| </section> |
| |
| <section id="FE_DISEQC_SEND_BURST"> |
| <title>FE_DISEQC_SEND_BURST</title> |
| <para>DESCRIPTION |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>This ioctl call is used to send a 22KHz tone burst.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>SYNOPSIS |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int ioctl(int fd, int request = |
| <link linkend="FE_DISEQC_SEND_BURST">FE_DISEQC_SEND_BURST</link>, fe_sec_mini_cmd_t burst);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>int fd</para> |
| </entry><entry |
| align="char"> |
| <para>File descriptor returned by a previous call to open().</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int request</para> |
| </entry><entry |
| align="char"> |
| <para>Equals <link linkend="FE_DISEQC_SEND_BURST">FE_DISEQC_SEND_BURST</link> for this command.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>fe_sec_mini_cmd_t |
| burst</para> |
| </entry><entry |
| align="char"> |
| <para>burst A or B.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| &return-value-dvb; |
| </section> |
| |
| <section id="FE_SET_TONE"> |
| <title>FE_SET_TONE</title> |
| <para>DESCRIPTION |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>This call is used to set the generation of the continuous 22kHz tone. This call |
| requires read/write permissions.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>SYNOPSIS |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int ioctl(int fd, int request = <link linkend="FE_SET_TONE">FE_SET_TONE</link>, |
| fe_sec_tone_mode_t tone);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>int fd</para> |
| </entry><entry |
| align="char"> |
| <para>File descriptor returned by a previous call to open().</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int request</para> |
| </entry><entry |
| align="char"> |
| <para>Equals <link linkend="FE_SET_TONE">FE_SET_TONE</link> for this command.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>fe_sec_tone_mode_t |
| tone</para> |
| </entry><entry |
| align="char"> |
| <para>The requested tone generation mode (on/off).</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| &return-value-dvb; |
| </section> |
| |
| <section id="FE_SET_VOLTAGE"> |
| <title>FE_SET_VOLTAGE</title> |
| <para>DESCRIPTION |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>This call is used to set the bus voltage. This call requires read/write |
| permissions.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| <para>SYNOPSIS |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int ioctl(int fd, int request = <link linkend="FE_SET_VOLTAGE">FE_SET_VOLTAGE</link>, |
| fe_sec_voltage_t voltage);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>int fd</para> |
| </entry><entry |
| align="char"> |
| <para>File descriptor returned by a previous call to open().</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int request</para> |
| </entry><entry |
| align="char"> |
| <para>Equals <link linkend="FE_SET_VOLTAGE">FE_SET_VOLTAGE</link> for this command.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>fe_sec_voltage_t |
| voltage</para> |
| </entry><entry |
| align="char"> |
| <para>The requested bus voltage.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| &return-value-dvb; |
| </section> |
| |
| <section id="FE_ENABLE_HIGH_LNB_VOLTAGE"> |
| <title>FE_ENABLE_HIGH_LNB_VOLTAGE</title> |
| <para>DESCRIPTION |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>If high != 0 enables slightly higher voltages instead of 13/18V (to compensate |
| for long cables). This call requires read/write permissions. Not all DVB |
| adapters support this ioctl.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>SYNOPSIS |
| </para> |
| <informaltable><tgroup cols="1"><tbody><row><entry |
| align="char"> |
| <para>int ioctl(int fd, int request = |
| <link linkend="FE_ENABLE_HIGH_LNB_VOLTAGE">FE_ENABLE_HIGH_LNB_VOLTAGE</link>, int high);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>PARAMETERS |
| </para> |
| <informaltable><tgroup cols="2"><tbody><row><entry |
| align="char"> |
| <para>int fd</para> |
| </entry><entry |
| align="char"> |
| <para>File descriptor returned by a previous call to open().</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int request</para> |
| </entry><entry |
| align="char"> |
| <para>Equals <link linkend="FE_SET_VOLTAGE">FE_SET_VOLTAGE</link> for this command.</para> |
| </entry> |
| </row><row><entry |
| align="char"> |
| <para>int high</para> |
| </entry><entry |
| align="char"> |
| <para>The requested bus voltage.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| &return-value-dvb; |
| </section> |
| |
| <section id="FE_SET_FRONTEND_TUNE_MODE"> |
| <title>FE_SET_FRONTEND_TUNE_MODE</title> |
| <para>DESCRIPTION</para> |
| <informaltable><tgroup cols="1"><tbody><row> |
| <entry align="char"> |
| <para>Allow setting tuner mode flags to the frontend.</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>SYNOPSIS</para> |
| <informaltable><tgroup cols="1"><tbody><row> |
| <entry align="char"> |
| <para>int ioctl(int fd, int request = |
| <link linkend="FE_SET_FRONTEND_TUNE_MODE">FE_SET_FRONTEND_TUNE_MODE</link>, unsigned int flags);</para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| <para>PARAMETERS</para> |
| <informaltable><tgroup cols="2"><tbody><row> |
| <entry align="char"> |
| <para>unsigned int flags</para> |
| </entry> |
| <entry align="char"> |
| <para> |
| FE_TUNE_MODE_ONESHOT When set, this flag will disable any zigzagging or other "normal" tuning behaviour. Additionally, there will be no automatic monitoring of the lock status, and hence no frontend events will be generated. If a frontend device is closed, this flag will be automatically turned off when the device is reopened read-write. |
| </para> |
| </entry> |
| </row></tbody></tgroup></informaltable> |
| |
| &return-value-dvb; |
| </section> |
| |
| </section> |
| |
| <section id="frontend_legacy_dvbv3_api"> |
| <title>DVB Frontend legacy API (a. k. a. DVBv3)</title> |
| <para>The usage of this API is deprecated, as it doesn't support all digital |
| TV standards, doesn't provide good statistics measurements and provides |
| incomplete information. This is kept only to support legacy applications.</para> |
| |
| &sub-frontend_legacy_api; |
| </section> |