- ``name``\ [32]
- Name of the modulator, a NUL-terminated ASCII string. This
- information is intended for the user.
+ information is intended for the user.
- .. row 3
- ``capability``
- Modulator capability flags. No flags are defined for this field,
- the tuner flags in struct :ref:`v4l2_tuner <v4l2-tuner>` are
- used accordingly. The audio flags indicate the ability to encode
- audio subprograms. They will *not* change for example with the
- current video standard.
+ the tuner flags in struct :ref:`v4l2_tuner <v4l2-tuner>` are
+ used accordingly. The audio flags indicate the ability to encode
+ audio subprograms. They will *not* change for example with the
+ current video standard.
- .. row 4
- ``rangelow``
- 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.
+ ``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.
- .. row 5
- ``rangehigh``
- 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.
+ ``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.
- .. row 6
- ``txsubchans``
- With this field applications can determine how audio sub-carriers
- shall be modulated. It contains a set of flags as defined in
- :ref:`modulator-txsubchans`. Note the tuner ``rxsubchans`` flags
- are reused, but the semantics are different. Video output devices
- are assumed to have an analog or PCM audio input with 1-3
- channels. The ``txsubchans`` flags select one or more channels for
- modulation, together with some audio subprogram indicator, for
- example a stereo pilot tone.
+ shall be modulated. It contains a set of flags as defined in
+ :ref:`modulator-txsubchans`. Note the tuner ``rxsubchans`` flags
+ are reused, but the semantics are different. Video output devices
+ are assumed to have an analog or PCM audio input with 1-3
+ channels. The ``txsubchans`` flags select one or more channels for
+ modulation, together with some audio subprogram indicator, for
+ example a stereo pilot tone.
- .. row 7
- ``reserved``\ [3]
- Reserved for future extensions. Drivers and applications must set
- the array to zero.
+ the array to zero.
- 0x0001
- Modulate channel 1 as mono audio, when the input has more
- channels, a down-mix of channel 1 and 2. This flag does not
- combine with ``V4L2_TUNER_SUB_STEREO`` or
- ``V4L2_TUNER_SUB_LANG1``.
+ channels, a down-mix of channel 1 and 2. This flag does not
+ combine with ``V4L2_TUNER_SUB_STEREO`` or
+ ``V4L2_TUNER_SUB_LANG1``.
- .. row 2
- 0x0002
- Modulate channel 1 and 2 as left and right channel of a stereo
- audio signal. When the input has only one channel or two channels
- and ``V4L2_TUNER_SUB_SAP`` is also set, channel 1 is encoded as
- left and right channel. This flag does not combine with
- ``V4L2_TUNER_SUB_MONO`` or ``V4L2_TUNER_SUB_LANG1``. When the
- driver does not support stereo audio it shall fall back to mono.
+ audio signal. When the input has only one channel or two channels
+ and ``V4L2_TUNER_SUB_SAP`` is also set, channel 1 is encoded as
+ left and right channel. This flag does not combine with
+ ``V4L2_TUNER_SUB_MONO`` or ``V4L2_TUNER_SUB_LANG1``. When the
+ driver does not support stereo audio it shall fall back to mono.
- .. row 3
- 0x0008
- Modulate channel 1 and 2 as primary and secondary language of a
- bilingual audio signal. When the input has only one channel it is
- used for both languages. It is not possible to encode the primary
- or secondary language only. This flag does not combine with
- ``V4L2_TUNER_SUB_MONO``, ``V4L2_TUNER_SUB_STEREO`` or
- ``V4L2_TUNER_SUB_SAP``. If the hardware does not support the
- respective audio matrix, or the current video standard does not
- permit bilingual audio the :ref:`VIDIOC_S_MODULATOR <VIDIOC_G_MODULATOR>` ioctl shall
- return an ``EINVAL`` error code and the driver shall fall back to mono
- or stereo mode.
+ bilingual audio signal. When the input has only one channel it is
+ used for both languages. It is not possible to encode the primary
+ or secondary language only. This flag does not combine with
+ ``V4L2_TUNER_SUB_MONO``, ``V4L2_TUNER_SUB_STEREO`` or
+ ``V4L2_TUNER_SUB_SAP``. If the hardware does not support the
+ respective audio matrix, or the current video standard does not
+ permit bilingual audio the :ref:`VIDIOC_S_MODULATOR <VIDIOC_G_MODULATOR>` ioctl shall
+ return an ``EINVAL`` error code and the driver shall fall back to mono
+ or stereo mode.
- .. row 4
- 0x0004
- When combined with ``V4L2_TUNER_SUB_MONO`` the first channel is
- encoded as mono audio, the last channel as Second Audio Program.
- When the input has only one channel it is used for both audio
- tracks. When the input has three channels the mono track is a
- down-mix of channel 1 and 2. When combined with
- ``V4L2_TUNER_SUB_STEREO`` channel 1 and 2 are encoded as left and
- right stereo audio, channel 3 as Second Audio Program. When the
- input has only two channels, the first is encoded as left and
- right channel and the second as SAP. When the input has only one
- channel it is used for all audio tracks. It is not possible to
- encode a Second Audio Program only. This flag must combine with
- ``V4L2_TUNER_SUB_MONO`` or ``V4L2_TUNER_SUB_STEREO``. If the
- hardware does not support the respective audio matrix, or the
- current video standard does not permit SAP the
- :ref:`VIDIOC_S_MODULATOR <VIDIOC_G_MODULATOR>` ioctl shall return an ``EINVAL`` error code and
- driver shall fall back to mono or stereo mode.
+ encoded as mono audio, the last channel as Second Audio Program.
+ When the input has only one channel it is used for both audio
+ tracks. When the input has three channels the mono track is a
+ down-mix of channel 1 and 2. When combined with
+ ``V4L2_TUNER_SUB_STEREO`` channel 1 and 2 are encoded as left and
+ right stereo audio, channel 3 as Second Audio Program. When the
+ input has only two channels, the first is encoded as left and
+ right channel and the second as SAP. When the input has only one
+ channel it is used for all audio tracks. It is not possible to
+ encode a Second Audio Program only. This flag must combine with
+ ``V4L2_TUNER_SUB_MONO`` or ``V4L2_TUNER_SUB_STEREO``. If the
+ hardware does not support the respective audio matrix, or the
+ current video standard does not permit SAP the
+ :ref:`VIDIOC_S_MODULATOR <VIDIOC_G_MODULATOR>` ioctl shall return an ``EINVAL`` error code and
+ driver shall fall back to mono or stereo mode.
- .. row 6
projects / deliverable / linux.git / blobdiff