.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. include:: ../../../../disclaimer-vi.rst :Original: Documentation/userspace-api/media/v4l/vidioc-g-tuner.rst :Translator: Google Translate (machine translation) :Upstream-at: 8541d8f725c6 .. warning:: Tài liệu này được dịch tự động bằng máy và chưa được review bởi người dịch. Nội dung có thể không chính xác hoặc khó hiểu ở một số chỗ. Khi có sự khác biệt với bản gốc, bản gốc luôn là chuẩn. Bản dịch chất lượng cao (được review) được đặt trong thư mục vi_VN/. .. c:namespace:: V4L .. _VIDIOC_G_TUNER: ************************************* ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER ************************************* Tên ==== VIDIOC_G_TUNER - VIDIOC_S_TUNER - Nhận hoặc đặt thuộc tính bộ điều chỉnh Tóm tắt ======== .. c:macro:: VIDIOC_G_TUNER ZZ0000ZZ .. c:macro:: VIDIOC_S_TUNER ZZ0000ZZ Đối số ========= ZZ0001ZZ Bộ mô tả tệp được trả về bởi ZZ0000ZZ. ZZ0001ZZ Con trỏ tới cấu trúc ZZ0000ZZ. Sự miêu tả =========== Để truy vấn các thuộc tính của ứng dụng bộ dò, hãy khởi tạo ZZ0001ZZ trường và loại bỏ mảng ZZ0002ZZ của cấu trúc ZZ0000ZZ và gọi ZZ0003ZZ ioctl với một con trỏ tới cấu trúc này. Trình điều khiển lấp đầy phần còn lại của cấu trúc hoặc trả về mã lỗi ZZ0004ZZ khi chỉ số nằm ngoài giới hạn. Đến liệt kê tất cả các ứng dụng bộ điều chỉnh sẽ bắt đầu ở chỉ số 0, tăng dần một cho đến khi trình điều khiển trả về ZZ0005ZZ. Bộ điều chỉnh có hai thuộc tính có thể ghi, chế độ âm thanh và đài phát thanh. tần số. Để thay đổi chế độ âm thanh, các ứng dụng sẽ khởi tạo Các trường ZZ0000ZZ, ZZ0001ZZ và ZZ0002ZZ và gọi ZZ0003ZZ ioctl. Điều này sẽ ZZ0004ZZ thay đổi bộ chỉnh sóng hiện tại, được xác định bởi đầu vào video hiện tại. Người lái xe có thể chọn một chế độ âm thanh khác nếu chế độ được yêu cầu không hợp lệ hoặc không được hỗ trợ. Vì đây là ioctl chỉ ghi nên nó không trả về kết quả thực sự chế độ âm thanh đã chọn. Các loại bộ điều chỉnh cụ thể của ZZ0000ZZ là ZZ0001ZZ và ZZ0002ZZ. Đối với thiết bị SDR, trường ZZ0003ZZ phải được khởi tạo về không. Thuật ngữ 'bộ điều chỉnh' có nghĩa là bộ thu SDR trong ngữ cảnh này. Để thay đổi tần số vô tuyến, ZZ0000ZZ ioctl có sẵn. .. tabularcolumns:: |p{1.3cm}|p{3.0cm}|p{7.0cm}|p{5.8cm}| .. c:type:: v4l2_tuner .. cssclass:: longtable .. flat-table:: struct v4l2_tuner :header-rows: 0 :stub-columns: 0 * - __u32 - ``index`` - :cspan:`1` Identifies the tuner, set by the application. * - __u8 - ``name``\ [32] - :cspan:`1` Name of the tuner, a NUL-terminated ASCII string. This information is intended for the user. * - __u32 - ``type`` - :cspan:`1` Type of the tuner, see :c:type:`v4l2_tuner_type`. * - __u32 - ``capability`` - :cspan:`1` Tuner capability flags, see :ref:`tuner-capability`. Audio flags indicate the ability to decode audio subprograms. They will *not* change, for example with the current video standard. When the structure refers to a radio tuner the ``V4L2_TUNER_CAP_LANG1``, ``V4L2_TUNER_CAP_LANG2`` and ``V4L2_TUNER_CAP_NORM`` flags can't be used. If multiple frequency bands are supported, then ``capability`` is the union of all ``capability`` fields of each struct :c:type:`v4l2_frequency_band`. * - __u32 - ``rangelow`` - :cspan:`1` The lowest tunable frequency in units of 62.5 kHz, or if the ``capability`` flag ``V4L2_TUNER_CAP_LOW`` is set, in units of 62.5 Hz, or if the ``capability`` flag ``V4L2_TUNER_CAP_1HZ`` is set, in units of 1 Hz. If multiple frequency bands are supported, then ``rangelow`` is the lowest frequency of all the frequency bands. * - __u32 - ``rangehigh`` - :cspan:`1` The highest tunable frequency in units of 62.5 kHz, or if the ``capability`` flag ``V4L2_TUNER_CAP_LOW`` is set, in units of 62.5 Hz, or if the ``capability`` flag ``V4L2_TUNER_CAP_1HZ`` is set, in units of 1 Hz. If multiple frequency bands are supported, then ``rangehigh`` is the highest frequency of all the frequency bands. * - __u32 - ``rxsubchans`` - :cspan:`1` Some tuners or audio decoders can determine the received audio subprograms by analyzing audio carriers, pilot tones or other indicators. To pass this information drivers set flags defined in :ref:`tuner-rxsubchans` in this field. For example: * - - - ``V4L2_TUNER_SUB_MONO`` - receiving mono audio * - - - ``STEREO | SAP`` - receiving stereo audio and a secondary audio program * - - - ``MONO | STEREO`` - receiving mono or stereo audio, the hardware cannot distinguish * - - - ``LANG1 | LANG2`` - receiving bilingual audio * - - - ``MONO | STEREO | LANG1 | LANG2`` - receiving mono, stereo or bilingual audio * - - - :cspan:`1` When the ``V4L2_TUNER_CAP_STEREO``, ``_LANG1``, ``_LANG2`` or ``_SAP`` flag is cleared in the ``capability`` field, the corresponding ``V4L2_TUNER_SUB_`` flag must not be set here. This field is valid only if this is the tuner of the current video input, or when the structure refers to a radio tuner. * - __u32 - ``audmode`` - :cspan:`1` The selected audio mode, see :ref:`tuner-audmode` for valid values. The audio mode does not affect audio subprogram detection, and like a :ref:`control` it does not automatically change unless the requested mode is invalid or unsupported. See :ref:`tuner-matrix` for possible results when the selected and received audio programs do not match. Currently this is the only field of struct struct :c:type:`v4l2_tuner` applications can change. * - __u32 - ``signal`` - :cspan:`1` The signal strength if known. Ranging from 0 to 65535. Higher values indicate a better signal. * - __s32 - ``afc`` - :cspan:`1` Automatic frequency control. When the ``afc`` value is negative, the frequency is too low, when positive too high. * - __u32 - ``reserved``\ [4] - :cspan:`1` Reserved for future extensions. Drivers and applications must set the array to zero. .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.5cm}| .. c:type:: v4l2_tuner_type .. flat-table:: enum v4l2_tuner_type :header-rows: 0 :stub-columns: 0 :widths: 3 1 6 * - ``V4L2_TUNER_RADIO`` - 1 - Tuner supports radio * - ``V4L2_TUNER_ANALOG_TV`` - 2 - Tuner supports analog TV * - ``V4L2_TUNER_SDR`` - 4 - Tuner controls the A/D and/or D/A block of a Software Digital Radio (SDR) * - ``V4L2_TUNER_RF`` - 5 - Tuner controls the RF part of a Software Digital Radio (SDR) .. tabularcolumns:: |p{7.0cm}|p{2.2cm}|p{8.1cm}| .. _tuner-capability: .. cssclass:: longtable .. flat-table:: Tuner and Modulator Capability Flags :header-rows: 0 :stub-columns: 0 :widths: 3 1 4 * - ``V4L2_TUNER_CAP_LOW`` - 0x0001 - When set, tuning frequencies are expressed in units of 62.5 Hz instead of 62.5 kHz. * - ``V4L2_TUNER_CAP_NORM`` - 0x0002 - This is a multi-standard tuner; the video standard can or must be switched. (B/G PAL tuners for example are typically not considered multi-standard because the video standard is automatically determined from the frequency band.) The set of supported video standards is available from the struct :c:type:`v4l2_input` pointing to this tuner, see the description of ioctl :ref:`VIDIOC_ENUMINPUT` for details. Only ``V4L2_TUNER_ANALOG_TV`` tuners can have this capability. * - ``V4L2_TUNER_CAP_HWSEEK_BOUNDED`` - 0x0004 - If set, then this tuner supports the hardware seek functionality where the seek stops when it reaches the end of the frequency range. * - ``V4L2_TUNER_CAP_HWSEEK_WRAP`` - 0x0008 - If set, then this tuner supports the hardware seek functionality where the seek wraps around when it reaches the end of the frequency range. * - ``V4L2_TUNER_CAP_STEREO`` - 0x0010 - Stereo audio reception is supported. * - ``V4L2_TUNER_CAP_LANG1`` - 0x0040 - Reception of the primary language of a bilingual audio program is supported. Bilingual audio is a feature of two-channel systems, transmitting the primary language monaural on the main audio carrier and a secondary language monaural on a second carrier. Only ``V4L2_TUNER_ANALOG_TV`` tuners can have this capability. * - ``V4L2_TUNER_CAP_LANG2`` - 0x0020 - Reception of the secondary language of a bilingual audio program is supported. Only ``V4L2_TUNER_ANALOG_TV`` tuners can have this capability. * - ``V4L2_TUNER_CAP_SAP`` - 0x0020 - Reception of a secondary audio program is supported. This is a feature of the BTSC system which accompanies the NTSC video standard. Two audio carriers are available for mono or stereo transmissions of a primary language, and an independent third carrier for a monaural secondary language. Only ``V4L2_TUNER_ANALOG_TV`` tuners can have this capability. .. note:: The ``V4L2_TUNER_CAP_LANG2`` and ``V4L2_TUNER_CAP_SAP`` flags are synonyms. ``V4L2_TUNER_CAP_SAP`` applies when the tuner supports the ``V4L2_STD_NTSC_M`` video standard. * - ``V4L2_TUNER_CAP_RDS`` - 0x0080 - RDS capture is supported. This capability is only valid for radio tuners. * - ``V4L2_TUNER_CAP_RDS_BLOCK_IO`` - 0x0100 - The RDS data is passed as unparsed RDS blocks. * - ``V4L2_TUNER_CAP_RDS_CONTROLS`` - 0x0200 - The RDS data is parsed by the hardware and set via controls. * - ``V4L2_TUNER_CAP_FREQ_BANDS`` - 0x0400 - The :ref:`VIDIOC_ENUM_FREQ_BANDS` ioctl can be used to enumerate the available frequency bands. * - ``V4L2_TUNER_CAP_HWSEEK_PROG_LIM`` - 0x0800 - The range to search when using the hardware seek functionality is programmable, see :ref:`VIDIOC_S_HW_FREQ_SEEK` for details. * - ``V4L2_TUNER_CAP_1HZ`` - 0x1000 - When set, tuning frequencies are expressed in units of 1 Hz instead of 62.5 kHz. .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.5cm}| .. _tuner-rxsubchans: .. flat-table:: Tuner Audio Reception Flags :header-rows: 0 :stub-columns: 0 :widths: 3 1 4 * - ``V4L2_TUNER_SUB_MONO`` - 0x0001 - The tuner receives a mono audio signal. * - ``V4L2_TUNER_SUB_STEREO`` - 0x0002 - The tuner receives a stereo audio signal. * - ``V4L2_TUNER_SUB_LANG1`` - 0x0008 - The tuner receives the primary language of a bilingual audio signal. Drivers must clear this flag when the current video standard is ``V4L2_STD_NTSC_M``. * - ``V4L2_TUNER_SUB_LANG2`` - 0x0004 - The tuner receives the secondary language of a bilingual audio signal (or a second audio program). * - ``V4L2_TUNER_SUB_SAP`` - 0x0004 - The tuner receives a Second Audio Program. .. note:: The ``V4L2_TUNER_SUB_LANG2`` and ``V4L2_TUNER_SUB_SAP`` flags are synonyms. The ``V4L2_TUNER_SUB_SAP`` flag applies when the current video standard is ``V4L2_STD_NTSC_M``. * - ``V4L2_TUNER_SUB_RDS`` - 0x0010 - The tuner receives an RDS channel. .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.5cm}| .. _tuner-audmode: .. flat-table:: Tuner Audio Modes :header-rows: 0 :stub-columns: 0 :widths: 3 1 4 * - ``V4L2_TUNER_MODE_MONO`` - 0 - Play mono audio. When the tuner receives a stereo signal this a down-mix of the left and right channel. When the tuner receives a bilingual or SAP signal this mode selects the primary language. * - ``V4L2_TUNER_MODE_STEREO`` - 1 - Play stereo audio. When the tuner receives bilingual audio it may play different languages on the left and right channel or the primary language is played on both channels. Playing different languages in this mode is deprecated. New drivers should do this only in ``MODE_LANG1_LANG2``. When the tuner receives no stereo signal or does not support stereo reception the driver shall fall back to ``MODE_MONO``. * - ``V4L2_TUNER_MODE_LANG1`` - 3 - Play the primary language, mono or stereo. Only ``V4L2_TUNER_ANALOG_TV`` tuners support this mode. * - ``V4L2_TUNER_MODE_LANG2`` - 2 - Play the secondary language, mono. When the tuner receives no bilingual audio or SAP, or their reception is not supported the driver shall fall back to mono or stereo mode. Only ``V4L2_TUNER_ANALOG_TV`` tuners support this mode. * - ``V4L2_TUNER_MODE_SAP`` - 2 - Play the Second Audio Program. When the tuner receives no bilingual audio or SAP, or their reception is not supported the driver shall fall back to mono or stereo mode. Only ``V4L2_TUNER_ANALOG_TV`` tuners support this mode. .. note:: The ``V4L2_TUNER_MODE_LANG2`` and ``V4L2_TUNER_MODE_SAP`` are synonyms. * - ``V4L2_TUNER_MODE_LANG1_LANG2`` - 4 - Play the primary language on the left channel, the secondary language on the right channel. When the tuner receives no bilingual audio or SAP, it shall fall back to ``MODE_LANG1`` or ``MODE_MONO``. Only ``V4L2_TUNER_ANALOG_TV`` tuners support this mode. .. raw:: latex \scriptsize .. tabularcolumns:: |p{1.5cm}|p{1.5cm}|p{2.9cm}|p{2.9cm}|p{2.9cm}|p{2.9cm}| .. _tuner-matrix: .. flat-table:: Tuner Audio Matrix :header-rows: 2 :stub-columns: 0 :widths: 7 7 14 14 14 14 * - - :cspan:`4` Selected ``V4L2_TUNER_MODE_`` * - Received ``V4L2_TUNER_SUB_`` - ``MONO`` - ``STEREO`` - ``LANG1`` - ``LANG2 = SAP`` - ``LANG1_LANG2``\ [#f1]_ * - ``MONO`` - Mono - Mono/Mono - Mono - Mono - Mono/Mono * - ``MONO | SAP`` - Mono - Mono/Mono - Mono - SAP - Mono/SAP (preferred) or Mono/Mono * - ``STEREO`` - L+R - L/R - Stereo L/R (preferred) or Mono L+R - Stereo L/R (preferred) or Mono L+R - L/R (preferred) or L+R/L+R * - ``STEREO | SAP`` - L+R - L/R - Stereo L/R (preferred) or Mono L+R - SAP - L+R/SAP (preferred) or L/R or L+R/L+R * - ``LANG1 | LANG2`` - Language 1 - Lang1/Lang2 (deprecated\ [#f2]_) or Lang1/Lang1 - Language 1 - Language 2 - Lang1/Lang2 (preferred) or Lang1/Lang1 .. raw:: latex \normalsize Giá trị trả về ============== Khi thành công, trả về 0, lỗi -1 và biến ZZ0001ZZ được đặt một cách thích hợp. Các mã lỗi chung được mô tả tại Chương ZZ0000ZZ. EINVAL Cấu trúc ZZ0000ZZ ZZ0001ZZ đã hết giới hạn. .. [#f1] This mode has been added in Linux 2.6.17 and may not be supported by older drivers. .. [#f2] Playback of both languages in ``MODE_STEREO`` is deprecated. In the future drivers should produce only the primary language in this mode. Applications should request ``MODE_LANG1_LANG2`` to record both languages or a stereo signal.