| .. -*- coding: utf-8; mode: rst -*- |
| |
| ************* |
| Frontend type |
| ************* |
| |
| For historical reasons, frontend types are named by the type of |
| modulation used in transmission. The fontend types are given by |
| fe_type_t type, defined as: |
| |
| |
| .. c:type:: fe_type |
| |
| .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}| |
| |
| .. flat-table:: Frontend types |
| :header-rows: 1 |
| :stub-columns: 0 |
| :widths: 3 1 4 |
| |
| |
| - .. row 1 |
| |
| - fe_type |
| |
| - Description |
| |
| - :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` equivalent |
| type |
| |
| - .. row 2 |
| |
| - .. _FE-QPSK: |
| |
| ``FE_QPSK`` |
| |
| - For DVB-S standard |
| |
| - ``SYS_DVBS`` |
| |
| - .. row 3 |
| |
| - .. _FE-QAM: |
| |
| ``FE_QAM`` |
| |
| - For DVB-C annex A standard |
| |
| - ``SYS_DVBC_ANNEX_A`` |
| |
| - .. row 4 |
| |
| - .. _FE-OFDM: |
| |
| ``FE_OFDM`` |
| |
| - For DVB-T standard |
| |
| - ``SYS_DVBT`` |
| |
| - .. row 5 |
| |
| - .. _FE-ATSC: |
| |
| ``FE_ATSC`` |
| |
| - For ATSC standard (terrestrial) or for DVB-C Annex B (cable) used |
| in US. |
| |
| - ``SYS_ATSC`` (terrestrial) or ``SYS_DVBC_ANNEX_B`` (cable) |
| |
| |
| Newer formats like DVB-S2, ISDB-T, ISDB-S and DVB-T2 are not described |
| at the above, as they're supported via the new |
| :ref:`FE_GET_PROPERTY/FE_GET_SET_PROPERTY <FE_GET_PROPERTY>` |
| ioctl's, using the :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` |
| parameter. |
| |
| In the old days, struct :c:type:`dvb_frontend_info` |
| used to contain ``fe_type_t`` field to indicate the delivery systems, |
| filled with either ``FE_QPSK, FE_QAM, FE_OFDM`` or ``FE_ATSC``. While this |
| is still filled to keep backward compatibility, the usage of this field |
| is deprecated, as it can report just one delivery system, but some |
| devices support multiple delivery systems. Please use |
| :ref:`DTV_ENUM_DELSYS <DTV-ENUM-DELSYS>` instead. |
| |
| On devices that support multiple delivery systems, struct |
| :c:type:`dvb_frontend_info`::``fe_type_t`` is |
| filled with the currently standard, as selected by the last call to |
| :ref:`FE_SET_PROPERTY <FE_GET_PROPERTY>` using the |
| :ref:`DTV_DELIVERY_SYSTEM <DTV-DELIVERY-SYSTEM>` property. |