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Diffstat (limited to 'Documentation/userspace-api/media')
7 files changed, 5037 insertions, 1 deletions
diff --git a/Documentation/userspace-api/media/drivers/ccs.rst b/Documentation/userspace-api/media/drivers/ccs.rst index 161cb65f4d..03015b33d5 100644 --- a/Documentation/userspace-api/media/drivers/ccs.rst +++ b/Documentation/userspace-api/media/drivers/ccs.rst @@ -2,6 +2,8 @@ .. include:: <isonum.txt> +.. _media-ccs-uapi: + MIPI CCS camera sensor driver ============================= @@ -13,6 +15,8 @@ the binner and the scaler. As the capabilities of individual devices vary, the driver exposes interfaces based on the capabilities that exist in hardware. +Also see :ref:`the CCS driver kernel documentation <media-ccs-driver>`. + Pixel Array sub-device ---------------------- @@ -30,7 +34,7 @@ that purpose, selection target ``V4L2_SEL_TGT_COMPOSE`` is supported on the sink pad (0). Additionally, if a device has no scaler or digital crop functionality, the -source pad (1) expses another digital crop selection rectangle that can only +source pad (1) exposes another digital crop selection rectangle that can only crop at the end of the lines and frames. Scaler diff --git a/Documentation/userspace-api/media/dvb/legacy_dvb_apis.rst b/Documentation/userspace-api/media/dvb/legacy_dvb_apis.rst index b97d56ee54..ffe8325749 100644 --- a/Documentation/userspace-api/media/dvb/legacy_dvb_apis.rst +++ b/Documentation/userspace-api/media/dvb/legacy_dvb_apis.rst @@ -23,3 +23,4 @@ DVB-S2, DVB-T2, ISDB, etc. :maxdepth: 1 frontend_legacy_dvbv3_api + legacy_dvb_decoder_api diff --git a/Documentation/userspace-api/media/dvb/legacy_dvb_audio.rst b/Documentation/userspace-api/media/dvb/legacy_dvb_audio.rst new file mode 100644 index 0000000000..b46fe2becd --- /dev/null +++ b/Documentation/userspace-api/media/dvb/legacy_dvb_audio.rst @@ -0,0 +1,1642 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later OR GPL-2.0 + +.. c:namespace:: dtv.legacy.audio + +.. _dvb_audio: + +================ +DVB Audio Device +================ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +The DVB audio device controls the MPEG2 audio decoder of the DVB +hardware. It can be accessed through ``/dev/dvb/adapter?/audio?``. Data +types and ioctl definitions can be accessed by including +``linux/dvb/audio.h`` in your application. + +Please note that most DVB cards don’t have their own MPEG decoder, which +results in the omission of the audio and video device. + +These ioctls were also used by V4L2 to control MPEG decoders implemented +in V4L2. The use of these ioctls for that purpose has been made obsolete +and proper V4L2 ioctls or controls have been created to replace that +functionality. Use :ref:`V4L2 ioctls<audio>` for new drivers! + + +Audio Data Types +================ + +This section describes the structures, data types and defines used when +talking to the audio device. + + +----- + + +audio_stream_source_t +--------------------- + +Synopsis +~~~~~~~~ + +.. c:enum:: audio_stream_source_t + +.. code-block:: c + + typedef enum { + AUDIO_SOURCE_DEMUX, + AUDIO_SOURCE_MEMORY + } audio_stream_source_t; + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``AUDIO_SOURCE_DEMUX`` + + - :cspan:`1` Selects the demultiplexer (fed either by the frontend + or the DVR device) as the source of the video stream. + + - .. + + - ``AUDIO_SOURCE_MEMORY`` + + - Selects the stream from the application that comes through + the `write()`_ system call. + +Description +~~~~~~~~~~~ + +The audio stream source is set through the `AUDIO_SELECT_SOURCE`_ call +and can take the following values, depending on whether we are replaying +from an internal (demux) or external (user write) source. + +The data fed to the decoder is also controlled by the PID-filter. +Output selection: :c:type:`dmx_output` ``DMX_OUT_DECODER``. + + +----- + + +audio_play_state_t +------------------ + +Synopsis +~~~~~~~~ + +.. c:enum:: audio_play_state_t + +.. code-block:: c + + typedef enum { + AUDIO_STOPPED, + AUDIO_PLAYING, + AUDIO_PAUSED + } audio_play_state_t; + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``AUDIO_STOPPED`` + + - Audio is stopped. + + - .. + + - ``AUDIO_PLAYING`` + + - Audio is currently playing. + + - .. + + - ``AUDIO_PAUSE`` + + - Audio is frozen. + +Description +~~~~~~~~~~~ + +This values can be returned by the `AUDIO_GET_STATUS`_ call +representing the state of audio playback. + + +----- + + +audio_channel_select_t +---------------------- + +Synopsis +~~~~~~~~ + +.. c:enum:: audio_channel_select_t + +.. code-block:: c + + typedef enum { + AUDIO_STEREO, + AUDIO_MONO_LEFT, + AUDIO_MONO_RIGHT, + AUDIO_MONO, + AUDIO_STEREO_SWAPPED + } audio_channel_select_t; + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``AUDIO_STEREO`` + + - Stereo. + + - .. + + - ``AUDIO_MONO_LEFT`` + + - Mono, select left stereo channel as source. + + - .. + + - ``AUDIO_MONO_RIGHT`` + + - Mono, select right stereo channel as source. + + - .. + + - ``AUDIO_MONO`` + + - Mono source only. + + - .. + + - ``AUDIO_STEREO_SWAPPED`` + + - Stereo, swap L & R. + +Description +~~~~~~~~~~~ + +The audio channel selected via `AUDIO_CHANNEL_SELECT`_ is determined by +this values. + + +----- + + +audio_mixer_t +------------- + +Synopsis +~~~~~~~~ + +.. c:struct:: audio_mixer + +.. code-block:: c + + typedef struct audio_mixer { + unsigned int volume_left; + unsigned int volume_right; + } audio_mixer_t; + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``unsigned int volume_left`` + + - Volume left channel. + Valid range: 0 ... 255 + + - .. + + - ``unsigned int volume_right`` + + - Volume right channel. + Valid range: 0 ... 255 + +Description +~~~~~~~~~~~ + +This structure is used by the `AUDIO_SET_MIXER`_ call to set the +audio volume. + + +----- + + +audio_status +------------ + +Synopsis +~~~~~~~~ + +.. c:struct:: audio_status + +.. code-block:: c + + typedef struct audio_status { + int AV_sync_state; + int mute_state; + audio_play_state_t play_state; + audio_stream_source_t stream_source; + audio_channel_select_t channel_select; + int bypass_mode; + audio_mixer_t mixer_state; + } audio_status_t; + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - :rspan:`2` ``int AV_sync_state`` + + - :cspan:`1` Shows if A/V synchronization is ON or OFF. + + - .. + + - TRUE ( != 0 ) + + - AV-sync ON. + + - .. + + - FALSE ( == 0 ) + + - AV-sync OFF. + + - .. + + - :rspan:`2` ``int mute_state`` + + - :cspan:`1` Indicates if audio is muted or not. + + - .. + + - TRUE ( != 0 ) + + - mute audio + + - .. + + - FALSE ( == 0 ) + + - unmute audio + + - .. + + - `audio_play_state_t`_ ``play_state`` + + - Current playback state. + + - .. + + - `audio_stream_source_t`_ ``stream_source`` + + - Current source of the data. + + - .. + + - :rspan:`2` ``int bypass_mode`` + + - :cspan:`1` Is the decoding of the current Audio stream in + the DVB subsystem enabled or disabled. + + - .. + + - TRUE ( != 0 ) + + - Bypass disabled. + + - .. + + - FALSE ( == 0 ) + + - Bypass enabled. + + - .. + + - `audio_mixer_t`_ ``mixer_state`` + + - Current volume settings. + +Description +~~~~~~~~~~~ + +The `AUDIO_GET_STATUS`_ call returns this structure as information +about various states of the playback operation. + + +----- + + +audio encodings +--------------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + #define AUDIO_CAP_DTS 1 + #define AUDIO_CAP_LPCM 2 + #define AUDIO_CAP_MP1 4 + #define AUDIO_CAP_MP2 8 + #define AUDIO_CAP_MP3 16 + #define AUDIO_CAP_AAC 32 + #define AUDIO_CAP_OGG 64 + #define AUDIO_CAP_SDDS 128 + #define AUDIO_CAP_AC3 256 + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``AUDIO_CAP_DTS`` + + - :cspan:`1` The hardware accepts DTS audio tracks. + + - .. + + - ``AUDIO_CAP_LPCM`` + + - The hardware accepts uncompressed audio with + Linear Pulse-Code Modulation (LPCM) + + - .. + + - ``AUDIO_CAP_MP1`` + + - The hardware accepts MPEG-1 Audio Layer 1. + + - .. + + - ``AUDIO_CAP_MP2`` + + - The hardware accepts MPEG-1 Audio Layer 2. + Also known as MUSICAM. + + - .. + + - ``AUDIO_CAP_MP3`` + + - The hardware accepts MPEG-1 Audio Layer III. + Commomly known as .mp3. + + - .. + + - ``AUDIO_CAP_AAC`` + + - The hardware accepts AAC (Advanced Audio Coding). + + - .. + + - ``AUDIO_CAP_OGG`` + + - The hardware accepts Vorbis audio tracks. + + - .. + + - ``AUDIO_CAP_SDDS`` + + - The hardware accepts Sony Dynamic Digital Sound (SDDS). + + - .. + + - ``AUDIO_CAP_AC3`` + + - The hardware accepts Dolby Digital ATSC A/52 audio. + Also known as AC-3. + +Description +~~~~~~~~~~~ + +A call to `AUDIO_GET_CAPABILITIES`_ returns an unsigned integer with the +following bits set according to the hardwares capabilities. + + +----- + + +Audio Function Calls +==================== + + +AUDIO_STOP +---------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_STOP + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_STOP) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - File descriptor returned by a previous call to `open()`_. + + - .. + + - ``int request`` + + - :cspan:`1` Equals ``AUDIO_STOP`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Audio Device to stop playing the current +stream. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_PLAY +---------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_PLAY + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_PLAY) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - File descriptor returned by a previous call to `open()`_. + + - .. + + - ``int request`` + + - :cspan:`1` Equals ``AUDIO_PLAY`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Audio Device to start playing an audio stream +from the selected source. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_PAUSE +----------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_PAUSE + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_PAUSE) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_PAUSE`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call suspends the audio stream being played. Decoding and +playing are paused. It is then possible to restart again decoding and +playing process of the audio stream using `AUDIO_CONTINUE`_ command. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_CONTINUE +-------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_CONTINUE + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_CONTINUE) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_CONTINUE`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl restarts the decoding and playing process previously paused +with `AUDIO_PAUSE`_ command. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_SELECT_SOURCE +------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_SELECT_SOURCE + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_SELECT_SOURCE, + audio_stream_source_t source) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_SELECT_SOURCE`` for this command. + + - .. + + - `audio_stream_source_t`_ ``source`` + + - Indicates the source that shall be used for the Audio stream. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call informs the audio device which source shall be used for +the input data. The possible sources are demux or memory. If +``AUDIO_SOURCE_MEMORY`` is selected, the data is fed to the Audio Device +through the write command. If ``AUDIO_SOURCE_DEMUX`` is selected, the data +is directly transferred from the onboard demux-device to the decoder. +Note: This only supports DVB-devices with one demux and one decoder so far. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_SET_MUTE +-------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_SET_MUTE + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_SET_MUTE, int state) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - :cspan:`1` Equals ``AUDIO_SET_MUTE`` for this command. + + - .. + + - :rspan:`2` ``int state`` + + - :cspan:`1` Indicates if audio device shall mute or not. + + - .. + + - TRUE ( != 0 ) + + - mute audio + + - .. + + - FALSE ( == 0 ) + + - unmute audio + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is for DVB devices only. To control a V4L2 decoder use the +V4L2 :ref:`VIDIOC_DECODER_CMD` with the +``V4L2_DEC_CMD_START_MUTE_AUDIO`` flag instead. + +This ioctl call asks the audio device to mute the stream that is +currently being played. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_SET_AV_SYNC +----------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_SET_AV_SYNC + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_SET_AV_SYNC, int state) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - :cspan:`1` Equals ``AUDIO_AV_SYNC`` for this command. + + - .. + + - :rspan:`2` ``int state`` + + - :cspan:`1` Tells the DVB subsystem if A/V synchronization + shall be ON or OFF. + + - .. + + - TRUE ( != 0 ) + + - AV-sync ON. + + - .. + + - FALSE ( == 0 ) + + - AV-sync OFF. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Audio Device to turn ON or OFF A/V +synchronization. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_SET_BYPASS_MODE +--------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_SET_BYPASS_MODE + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_SET_BYPASS_MODE, int mode) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - :cspan:`1` Equals ``AUDIO_SET_BYPASS_MODE`` for this command. + + - .. + + - :rspan:`2` ``int mode`` + + - :cspan:`1` Enables or disables the decoding of the current + Audio stream in the DVB subsystem. + - .. + + - TRUE ( != 0 ) + + - Disable bypass + + - .. + + - FALSE ( == 0 ) + + - Enable bypass + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Audio Device to bypass the Audio decoder and +forward the stream without decoding. This mode shall be used if streams +that can’t be handled by the DVB system shall be decoded. Dolby +DigitalTM streams are automatically forwarded by the DVB subsystem if +the hardware can handle it. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_CHANNEL_SELECT +-------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_CHANNEL_SELECT + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_CHANNEL_SELECT, + audio_channel_select_t) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_CHANNEL_SELECT`` for this command. + + - .. + + - `audio_channel_select_t`_ ``ch`` + + - Select the output format of the audio (mono left/right, stereo). + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is for DVB devices only. To control a V4L2 decoder use the +V4L2 ``V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK`` control instead. + +This ioctl call asks the Audio Device to select the requested channel if +possible. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_GET_STATUS +---------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_GET_STATUS + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_GET_STATUS, + struct audio_status *status) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals AUDIO_GET_STATUS for this command. + + - .. + + - ``struct`` `audio_status`_ ``*status`` + + - Returns the current state of Audio Device. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Audio Device to return the current state of the +Audio Device. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_GET_CAPABILITIES +---------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_GET_CAPABILITIES + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_GET_CAPABILITIES, + unsigned int *cap) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_GET_CAPABILITIES`` for this command. + + - .. + + - ``unsigned int *cap`` + + - Returns a bit array of supported sound formats. + Bits are defined in `audio encodings`_. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Audio Device to tell us about the decoding +capabilities of the audio hardware. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_CLEAR_BUFFER +------------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_CLEAR_BUFFER + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_CLEAR_BUFFER) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_CLEAR_BUFFER`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Audio Device to clear all software and hardware +buffers of the audio decoder device. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_SET_ID +------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_SET_ID + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_SET_ID, int id) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_SET_ID`` for this command. + + - .. + + - ``int id`` + + - Audio sub-stream id. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl selects which sub-stream is to be decoded if a program or +system stream is sent to the video device. + +If no audio stream type is set the id has to be in range [0xC0,0xDF] +for MPEG sound, in [0x80,0x87] for AC3 and in [0xA0,0xA7] for LPCM. +See ITU-T H.222.0 | ISO/IEC 13818-1 for further description. + +If the stream type is set with `AUDIO_SET_STREAMTYPE`_, specifies the +id just the sub-stream id of the audio stream and only the first 5 bits +(& 0x1F) are recognized. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_SET_MIXER +--------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_SET_MIXER + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_SET_MIXER, audio_mixer_t *mix) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_SET_MIXER`` for this command. + + - .. + + - ``audio_mixer_t *mix`` + + - Mixer settings. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl lets you adjust the mixer settings of the audio decoder. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +AUDIO_SET_STREAMTYPE +-------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_SET_STREAMTYPE + +.. code-block:: c + + int ioctl(fd, int request = AUDIO_SET_STREAMTYPE, int type) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_SET_STREAMTYPE`` for this command. + + - .. + + - ``int type`` + + - Stream type. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl tells the driver which kind of audio stream to expect. This +is useful if the stream offers several audio sub-streams like LPCM and +AC3. + +Stream types defined in ITU-T H.222.0 | ISO/IEC 13818-1 are used. + + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EINVAL`` + + - Type is not a valid or supported stream type. + + +----- + + +AUDIO_BILINGUAL_CHANNEL_SELECT +------------------------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: AUDIO_BILINGUAL_CHANNEL_SELECT + +.. code-block:: c + + int ioctl(int fd, int request = AUDIO_BILINGUAL_CHANNEL_SELECT, + audio_channel_select_t) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``AUDIO_BILINGUAL_CHANNEL_SELECT`` for this command. + + - .. + + - ``audio_channel_select_t ch`` + + - Select the output format of the audio (mono left/right, stereo). + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl has been replaced by the V4L2 +``V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK`` control +for MPEG decoders controlled through V4L2. + +This ioctl call asks the Audio Device to select the requested channel +for bilingual streams if possible. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +open() +------ + +Synopsis +~~~~~~~~ + +.. code-block:: c + + #include <fcntl.h> + +.. c:function:: int open(const char *deviceName, int flags) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``const char *deviceName`` + + - Name of specific audio device. + + - .. + + - :rspan:`3` ``int flags`` + + - :cspan:`1` A bit-wise OR of the following flags: + + - .. + + - ``O_RDONLY`` + + - read-only access + + - .. + + - ``O_RDWR`` + + - read/write access + + - .. + + - ``O_NONBLOCK`` + - | Open in non-blocking mode + | (blocking mode is the default) + +Description +~~~~~~~~~~~ + +This system call opens a named audio device (e.g. +``/dev/dvb/adapter0/audio0``) for subsequent use. When an open() call has +succeeded, the device will be ready for use. The significance of +blocking or non-blocking mode is described in the documentation for +functions where there is a difference. It does not affect the semantics +of the open() call itself. A 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. Only one user can open the Audio Device +in O_RDWR mode. All other attempts to open the device in this mode will +fail, and an error code will be returned. If the Audio Device is opened +in O_RDONLY mode, the only ioctl call that can be used is +`AUDIO_GET_STATUS`_. All other call will return with an error code. + +Return Value +~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``ENODEV`` + + - Device driver not loaded/available. + + - .. + + - ``EBUSY`` + + - Device or resource busy. + + - .. + + - ``EINVAL`` + + - Invalid argument. + + +----- + + +close() +------- + +Synopsis +~~~~~~~~ + +.. c:function:: int close(int fd) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + +Description +~~~~~~~~~~~ + +This system call closes a previously opened audio device. + +Return Value +~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EBADF`` + + - Fd is not a valid open file descriptor. + +----- + + +write() +------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + size_t write(int fd, const void *buf, size_t count) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``void *buf`` + + - Pointer to the buffer containing the PES data. + + - .. + + - ``size_t count`` + + - Size of buf. + +Description +~~~~~~~~~~~ + +This system call can only be used if ``AUDIO_SOURCE_MEMORY`` is selected +in the ioctl call `AUDIO_SELECT_SOURCE`_. The data provided shall be in +PES format. If ``O_NONBLOCK`` is not specified the function will block +until buffer space is available. The amount of data to be transferred is +implied by count. + +Return Value +~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EPERM`` + + - :cspan:`1` Mode ``AUDIO_SOURCE_MEMORY`` not selected. + + - .. + + - ``ENOMEM`` + + - Attempted to write more data than the internal buffer can hold. + + - .. + + - ``EBADF`` + + - Fd is not a valid open file descriptor. diff --git a/Documentation/userspace-api/media/dvb/legacy_dvb_decoder_api.rst b/Documentation/userspace-api/media/dvb/legacy_dvb_decoder_api.rst new file mode 100644 index 0000000000..f58985a6e6 --- /dev/null +++ b/Documentation/userspace-api/media/dvb/legacy_dvb_decoder_api.rst @@ -0,0 +1,61 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later OR GPL-2.0 + +.. _legacy_dvb_decoder_api: + +============================ +Legacy DVB MPEG Decoder APIs +============================ + +.. _legacy_dvb_decoder_notes: + +General Notes +============= + +This API has originally been designed for DVB only and is therefore limited to +the :ref:`legacy_dvb_decoder_formats` used in such digital TV-broadcastsystems. + +To circumvent this limitations the more versatile :ref:`V4L2 <v4l2spec>` API has +been designed. Which replaces this part of the DVB API. + +Nevertheless there have been projects build around this API. +To ensure compatibility this API is kept as it is. + +.. attention:: Do **not** use this API in new drivers! + + For audio and video use the :ref:`V4L2 <v4l2spec>` and ALSA APIs. + + Pipelines should be set up using the :ref:`Media Controller API<media_controller>`. + +Practically the decoders seem to be treated differently. The application typically +knows which decoder is in use or it is specially written for one decoder type. +Querying capabilities are rarely used because they are already known. + + +.. _legacy_dvb_decoder_formats: + +Data Formats +============ + +The API has been designed for DVB and compatible broadcastsystems. +Because of that fact the only supported data formats are ISO/IEC 13818-1 +compatible MPEG streams. The supported payloads may vary depending on the +used decoder. + +Timestamps are always MPEG PTS as defined in ITU T-REC-H.222.0 / +ISO/IEC 13818-1, if not otherwise noted. + +For storing recordings typically TS streams are used, in lesser extent PES. +Both variants are commonly accepted for playback, but it may be driver dependent. + + + + +Table of Contents +================= + +.. toctree:: + :maxdepth: 2 + + legacy_dvb_video + legacy_dvb_audio + legacy_dvb_osd diff --git a/Documentation/userspace-api/media/dvb/legacy_dvb_osd.rst b/Documentation/userspace-api/media/dvb/legacy_dvb_osd.rst new file mode 100644 index 0000000000..179b66a801 --- /dev/null +++ b/Documentation/userspace-api/media/dvb/legacy_dvb_osd.rst @@ -0,0 +1,883 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later OR GPL-2.0 + +.. c:namespace:: dtv.legacy.osd + +.. _dvb_osd: + +============== +DVB OSD Device +============== + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +The DVB OSD device controls the OnScreen-Display of the AV7110 based +DVB-cards with hardware MPEG2 decoder. It can be accessed through +``/dev/dvb/adapter?/osd0``. +Data types and ioctl definitions can be accessed by including +``linux/dvb/osd.h`` in your application. + +The OSD is not a frame-buffer like on many other cards. +It is a kind of canvas one can draw on. +The color-depth is limited depending on the memory size installed. +An appropriate palette of colors has to be set up. +The installed memory size can be identified with the `OSD_GET_CAPABILITY`_ +ioctl. + +OSD Data Types +============== + +OSD_Command +----------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef enum { + /* All functions return -2 on "not open" */ + OSD_Close = 1, + OSD_Open, + OSD_Show, + OSD_Hide, + OSD_Clear, + OSD_Fill, + OSD_SetColor, + OSD_SetPalette, + OSD_SetTrans, + OSD_SetPixel, + OSD_GetPixel, + OSD_SetRow, + OSD_SetBlock, + OSD_FillRow, + OSD_FillBlock, + OSD_Line, + OSD_Query, + OSD_Test, + OSD_Text, + OSD_SetWindow, + OSD_MoveWindow, + OSD_OpenRaw, + } OSD_Command; + +Commands +~~~~~~~~ + +.. note:: All functions return -2 on "not open" + +.. flat-table:: + :header-rows: 1 + :stub-columns: 0 + + - .. + + - Command + + - | Used variables of ``struct`` `osd_cmd_t`_. + | Usage{variable} if alternative use. + + - :cspan:`2` Description + + + + - .. + + - ``OSD_Close`` + + - - + + - | Disables OSD and releases the buffers. + | Returns 0 on success. + + - .. + + - ``OSD_Open`` + + - | x0,y0,x1,y1, + | BitPerPixel[2/4/8]{color&0x0F}, + | mix[0..15]{color&0xF0} + + - | Opens OSD with this size and bit depth + | Returns 0 on success, + | -1 on DRAM allocation error, + | -2 on "already open". + + - .. + + - ``OSD_Show`` + + - - + + - | Enables OSD mode. + | Returns 0 on success. + + - .. + + - ``OSD_Hide`` + + - - + + - | Disables OSD mode. + | Returns 0 on success. + + - .. + + - ``OSD_Clear`` + + - - + + - | Sets all pixel to color 0. + | Returns 0 on success. + + - .. + + - ``OSD_Fill`` + + - color + + - | Sets all pixel to color <color>. + | Returns 0 on success. + + - .. + + - ``OSD_SetColor`` + + - | color, + | R{x0},G{y0},B{x1}, + | opacity{y1} + + - | Set palette entry <num> to <r,g,b>, <mix> and <trans> apply + | R,G,B: 0..255 + | R=Red, G=Green, B=Blue + | opacity=0: pixel opacity 0% (only video pixel shows) + | opacity=1..254: pixel opacity as specified in header + | opacity=255: pixel opacity 100% (only OSD pixel shows) + | Returns 0 on success, -1 on error. + + - .. + + - ``OSD_SetPalette`` + + - | firstcolor{color}, + | lastcolor{x0},data + + - | Set a number of entries in the palette. + | Sets the entries "firstcolor" through "lastcolor" from the + array "data". + | Data has 4 byte for each color: + | R,G,B, and a opacity value: 0->transparent, 1..254->mix, + 255->pixel + + - .. + + - ``OSD_SetTrans`` + + - transparency{color} + + - | Sets transparency of mixed pixel (0..15). + | Returns 0 on success. + + - .. + + - ``OSD_SetPixel`` + + - x0,y0,color + + - | Sets pixel <x>,<y> to color number <color>. + | Returns 0 on success, -1 on error. + + - .. + + - ``OSD_GetPixel`` + + - x0,y0 + + - | Returns color number of pixel <x>,<y>, or -1. + | Command currently not supported by the AV7110! + + - .. + + - ``OSD_SetRow`` + + - x0,y0,x1,data + + - | Fills pixels x0,y through x1,y with the content of data[]. + | Returns 0 on success, -1 on clipping all pixel (no pixel + drawn). + + - .. + + - ``OSD_SetBlock`` + + - | x0,y0,x1,y1, + | increment{color}, + | data + + - | Fills pixels x0,y0 through x1,y1 with the content of data[]. + | Inc contains the width of one line in the data block, + | inc<=0 uses block width as line width. + | Returns 0 on success, -1 on clipping all pixel. + + - .. + + - ``OSD_FillRow`` + + - x0,y0,x1,color + + - | Fills pixels x0,y through x1,y with the color <color>. + | Returns 0 on success, -1 on clipping all pixel. + + - .. + + - ``OSD_FillBlock`` + + - x0,y0,x1,y1,color + + - | Fills pixels x0,y0 through x1,y1 with the color <color>. + | Returns 0 on success, -1 on clipping all pixel. + + - .. + + - ``OSD_Line`` + + - x0,y0,x1,y1,color + + - | Draw a line from x0,y0 to x1,y1 with the color <color>. + | Returns 0 on success. + + - .. + + - ``OSD_Query`` + + - | x0,y0,x1,y1, + | xasp{color}; yasp=11 + + - | Fills parameters with the picture dimensions and the pixel + aspect ratio. + | Returns 0 on success. + | Command currently not supported by the AV7110! + + - .. + + - ``OSD_Test`` + + - - + + - | Draws a test picture. + | For debugging purposes only. + | Returns 0 on success. + - .. + + - ``OSD_Text`` + + - x0,y0,size,color,text + + - Draws a text at position x0,y0 with the color <color>. + + - .. + + - ``OSD_SetWindow`` + + - x0 + + - Set window with number 0<x0<8 as current. + + - .. + + - ``OSD_MoveWindow`` + + - x0,y0 + + - Move current window to (x0, y0). + + - .. + + - ``OSD_OpenRaw`` + + - | x0,y0,x1,y1, + | `osd_raw_window_t`_ {color} + + - Open other types of OSD windows. + +Description +~~~~~~~~~~~ + +The ``OSD_Command`` data type is used with the `OSD_SEND_CMD`_ ioctl to +tell the driver which OSD_Command to execute. + + +----- + +osd_cmd_t +--------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef struct osd_cmd_s { + OSD_Command cmd; + int x0; + int y0; + int x1; + int y1; + int color; + void __user *data; + } osd_cmd_t; + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``OSD_Command cmd`` + + - `OSD_Command`_ to be executed. + + - .. + + - ``int x0`` + + - First horizontal position. + + - .. + + - ``int y0`` + + - First vertical position. + + - .. + + - ``int x1`` + + - Second horizontal position. + + - .. + + - ``int y1`` + + - Second vertical position. + + - .. + + - ``int color`` + + - Number of the color in the palette. + + - .. + + - ``void __user *data`` + + - Command specific Data. + +Description +~~~~~~~~~~~ + +The ``osd_cmd_t`` data type is used with the `OSD_SEND_CMD`_ ioctl. +It contains the data for the OSD_Command and the `OSD_Command`_ itself. +The structure has to be passed to the driver and the components may be +modified by it. + + +----- + + +osd_raw_window_t +---------------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef enum { + OSD_BITMAP1, + OSD_BITMAP2, + OSD_BITMAP4, + OSD_BITMAP8, + OSD_BITMAP1HR, + OSD_BITMAP2HR, + OSD_BITMAP4HR, + OSD_BITMAP8HR, + OSD_YCRCB422, + OSD_YCRCB444, + OSD_YCRCB444HR, + OSD_VIDEOTSIZE, + OSD_VIDEOHSIZE, + OSD_VIDEOQSIZE, + OSD_VIDEODSIZE, + OSD_VIDEOTHSIZE, + OSD_VIDEOTQSIZE, + OSD_VIDEOTDSIZE, + OSD_VIDEONSIZE, + OSD_CURSOR + } osd_raw_window_t; + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``OSD_BITMAP1`` + + - :cspan:`1` 1 bit bitmap + + - .. + + - ``OSD_BITMAP2`` + + - 2 bit bitmap + + - .. + + - ``OSD_BITMAP4`` + + - 4 bit bitmap + + - .. + + - ``OSD_BITMAP8`` + + - 8 bit bitmap + + - .. + + - ``OSD_BITMAP1HR`` + + - 1 Bit bitmap half resolution + + - .. + + - ``OSD_BITMAP2HR`` + + - 2 Bit bitmap half resolution + + - .. + + - ``OSD_BITMAP4HR`` + + - 4 Bit bitmap half resolution + + - .. + + - ``OSD_BITMAP8HR`` + + - 8 Bit bitmap half resolution + + - .. + + - ``OSD_YCRCB422`` + + - 4:2:2 YCRCB Graphic Display + + - .. + + - ``OSD_YCRCB444`` + + - 4:4:4 YCRCB Graphic Display + + - .. + + - ``OSD_YCRCB444HR`` + + - 4:4:4 YCRCB graphic half resolution + + - .. + + - ``OSD_VIDEOTSIZE`` + + - True Size Normal MPEG Video Display + + - .. + + - ``OSD_VIDEOHSIZE`` + + - MPEG Video Display Half Resolution + + - .. + + - ``OSD_VIDEOQSIZE`` + + - MPEG Video Display Quarter Resolution + + - .. + + - ``OSD_VIDEODSIZE`` + + - MPEG Video Display Double Resolution + + - .. + + - ``OSD_VIDEOTHSIZE`` + + - True Size MPEG Video Display Half Resolution + + - .. + + - ``OSD_VIDEOTQSIZE`` + + - True Size MPEG Video Display Quarter Resolution + + - .. + + - ``OSD_VIDEOTDSIZE`` + + - True Size MPEG Video Display Double Resolution + + - .. + + - ``OSD_VIDEONSIZE`` + + - Full Size MPEG Video Display + + - .. + + - ``OSD_CURSOR`` + + - Cursor + +Description +~~~~~~~~~~~ + +The ``osd_raw_window_t`` data type is used with the `OSD_Command`_ +OSD_OpenRaw to tell the driver which type of OSD to open. + + +----- + + +osd_cap_t +--------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef struct osd_cap_s { + int cmd; + #define OSD_CAP_MEMSIZE 1 + long val; + } osd_cap_t; + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int cmd`` + + - Capability to query. + + - .. + + - ``long val`` + + - Used to store the Data. + +Supported capabilities +~~~~~~~~~~~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``OSD_CAP_MEMSIZE`` + + - Memory size installed on the card. + +Description +~~~~~~~~~~~ + +This structure of data used with the `OSD_GET_CAPABILITY`_ call. + + +----- + + +OSD Function Calls +================== + +OSD_SEND_CMD +------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: OSD_SEND_CMD + +.. code-block:: c + + int ioctl(int fd, int request = OSD_SEND_CMD, enum osd_cmd_t *cmd) + + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Pointer to the location of the structure `osd_cmd_t`_ for this + command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl sends the `OSD_Command`_ to the card. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EINVAL`` + + - Command is out of range. + + +----- + + +OSD_GET_CAPABILITY +------------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: OSD_GET_CAPABILITY + +.. code-block:: c + + int ioctl(int fd, int request = OSD_GET_CAPABILITY, + struct osd_cap_t *cap) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``OSD_GET_CAPABILITY`` for this command. + + - .. + + - ``unsigned int *cap`` + + - Pointer to the location of the structure `osd_cap_t`_ for this + command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is used to get the capabilities of the OSD of the AV7110 based +DVB-decoder-card in use. + +.. note:: + The structure osd_cap_t has to be setup by the user and passed to the + driver. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + + - .. + + - ``EINVAL`` + + - Unsupported capability. + + +----- + + +open() +------ + +Synopsis +~~~~~~~~ + +.. code-block:: c + + #include <fcntl.h> + +.. c:function:: int open(const char *deviceName, int flags) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``const char *deviceName`` + + - Name of specific OSD device. + + - .. + + - :rspan:`3` ``int flags`` + + - :cspan:`1` A bit-wise OR of the following flags: + + - .. + + - ``O_RDONLY`` + + - read-only access + + - .. + + - ``O_RDWR`` + + - read/write access + + - .. + + - ``O_NONBLOCK`` + - | Open in non-blocking mode + | (blocking mode is the default) + +Description +~~~~~~~~~~~ + +This system call opens a named OSD device (e.g. +``/dev/dvb/adapter?/osd0``) for subsequent use. + +Return Value +~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``ENODEV`` + + - Device driver not loaded/available. + + - .. + + - ``EINTERNAL`` + + - Internal error. + + - .. + + - ``EBUSY`` + + - Device or resource busy. + + - .. + + - ``EINVAL`` + + - Invalid argument. + + +----- + + +close() +------- + +Synopsis +~~~~~~~~ + +.. c:function:: int close(int fd) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_ . + +Description +~~~~~~~~~~~ + +This system call closes a previously opened OSD device. + +Return Value +~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EBADF`` + + - fd is not a valid open file descriptor. diff --git a/Documentation/userspace-api/media/dvb/legacy_dvb_video.rst b/Documentation/userspace-api/media/dvb/legacy_dvb_video.rst new file mode 100644 index 0000000000..b9fd5cadae --- /dev/null +++ b/Documentation/userspace-api/media/dvb/legacy_dvb_video.rst @@ -0,0 +1,2430 @@ +.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later OR GPL-2.0 + +.. c:namespace:: dtv.legacy.video + +.. _dvb_video: + +================ +DVB Video Device +================ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +The DVB video device controls the MPEG2 video decoder of the DVB +hardware. It can be accessed through ``/dev/dvb/adapter0/video0``. Data +types and ioctl definitions can be accessed by including +``linux/dvb/video.h`` in your application. + +Note that the DVB video device only controls decoding of the MPEG video +stream, not its presentation on the TV or computer screen. On PCs this +is typically handled by an associated video4linux device, e.g. +``/dev/video``, which allows scaling and defining output windows. + +Most DVB cards don’t have their own MPEG decoder, which results in the +omission of the audio and video device as well as the video4linux +device. + +These ioctls were also used by V4L2 to control MPEG decoders implemented +in V4L2. The use of these ioctls for that purpose has been made obsolete +and proper V4L2 ioctls or controls have been created to replace that +functionality. Use :ref:`V4L2 ioctls<video>` for new drivers! + + +Video Data Types +================ + + + +video_format_t +-------------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef enum { + VIDEO_FORMAT_4_3, + VIDEO_FORMAT_16_9, + VIDEO_FORMAT_221_1 + } video_format_t; + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``VIDEO_FORMAT_4_3`` + + - Select 4:3 format. + + - .. + + - ``VIDEO_FORMAT_16_9`` + + - Select 16:9 format. + + - .. + + - ``VIDEO_FORMAT_221_1`` + + - Select 2.21:1 format. + +Description +~~~~~~~~~~~ + +The ``video_format_t`` data type +is used in the `VIDEO_SET_FORMAT`_ function to tell the driver which +aspect ratio the output hardware (e.g. TV) has. It is also used in the +data structures `video_status`_ returned by `VIDEO_GET_STATUS`_ +and `video_event`_ returned by `VIDEO_GET_EVENT`_ which report +about the display format of the current video stream. + + +----- + + +video_displayformat_t +--------------------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef enum { + VIDEO_PAN_SCAN, + VIDEO_LETTER_BOX, + VIDEO_CENTER_CUT_OUT + } video_displayformat_t; + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``VIDEO_PAN_SCAN`` + + - Use pan and scan format. + + - .. + + - ``VIDEO_LETTER_BOX`` + + - Use letterbox format. + + - .. + + - ``VIDEO_CENTER_CUT_OUT`` + + - Use center cut out format. + +Description +~~~~~~~~~~~ + +In case the display format of the video stream and of the display +hardware differ the application has to specify how to handle the +cropping of the picture. This can be done using the +`VIDEO_SET_DISPLAY_FORMAT`_ call which accepts this enum as argument. + + +----- + + +video_size_t +------------ + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef struct { + int w; + int h; + video_format_t aspect_ratio; + } video_size_t; + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int w`` + + - Video width in pixels. + + - .. + + - ``int h`` + + - Video height in pixels. + + - .. + + - `video_format_t`_ ``aspect_ratio`` + + - Aspect ratio. + +Description +~~~~~~~~~~~ + +Used in the struct `video_event`_. It stores the resolution and +aspect ratio of the video. + + +----- + + +video_stream_source_t +--------------------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef enum { + VIDEO_SOURCE_DEMUX, + VIDEO_SOURCE_MEMORY + } video_stream_source_t; + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``VIDEO_SOURCE_DEMUX`` + + - :cspan:`1` Select the demux as the main source. + + - .. + + - ``VIDEO_SOURCE_MEMORY`` + + - If this source is selected, the stream + comes from the user through the write + system call. + +Description +~~~~~~~~~~~ + +The video stream source is set through the `VIDEO_SELECT_SOURCE`_ call +and can take the following values, depending on whether we are replaying +from an internal (demuxer) or external (user write) source. +VIDEO_SOURCE_DEMUX selects the demultiplexer (fed either by the +frontend or the DVR device) as the source of the video stream. If +VIDEO_SOURCE_MEMORY is selected the stream comes from the application +through the `write()`_ system call. + + +----- + + +video_play_state_t +------------------ + +Synopsis +~~~~~~~~ + +.. code-block:: c + + typedef enum { + VIDEO_STOPPED, + VIDEO_PLAYING, + VIDEO_FREEZED + } video_play_state_t; + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``VIDEO_STOPPED`` + + - Video is stopped. + + - .. + + - ``VIDEO_PLAYING`` + + - Video is currently playing. + + - .. + + - ``VIDEO_FREEZED`` + + - Video is frozen. + +Description +~~~~~~~~~~~ + +This values can be returned by the `VIDEO_GET_STATUS`_ call +representing the state of video playback. + + +----- + + +struct video_command +-------------------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + struct video_command { + __u32 cmd; + __u32 flags; + union { + struct { + __u64 pts; + } stop; + + struct { + __s32 speed; + __u32 format; + } play; + + struct { + __u32 data[16]; + } raw; + }; + }; + + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``__u32 cmd`` + + - `Decoder command`_ + + - .. + + - ``__u32 flags`` + + - Flags for the `Decoder command`_. + + - .. + + - ``struct stop`` + + - ``__u64 pts`` + + - MPEG PTS + + - .. + + - :rspan:`5` ``stuct play`` + + - :rspan:`4` ``__s32 speed`` + + - 0 or 1000 specifies normal speed, + + - .. + + - 1: specifies forward single stepping, + + - .. + + - -1: specifies backward single stepping, + + - .. + + - >1: playback at speed / 1000 of the normal speed + + - .. + + - <-1: reverse playback at ( -speed / 1000 ) of the normal speed. + + - .. + + - ``__u32 format`` + + - `Play input formats`_ + + - .. + + - ``__u32 data[16]`` + + - Reserved + +Description +~~~~~~~~~~~ + +The structure must be zeroed before use by the application. This ensures +it can be extended safely in the future. + + +----- + + +Predefined decoder commands and flags +------------------------------------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + #define VIDEO_CMD_PLAY (0) + #define VIDEO_CMD_STOP (1) + #define VIDEO_CMD_FREEZE (2) + #define VIDEO_CMD_CONTINUE (3) + + #define VIDEO_CMD_FREEZE_TO_BLACK (1 << 0) + + #define VIDEO_CMD_STOP_TO_BLACK (1 << 0) + #define VIDEO_CMD_STOP_IMMEDIATELY (1 << 1) + + #define VIDEO_PLAY_FMT_NONE (0) + #define VIDEO_PLAY_FMT_GOP (1) + + #define VIDEO_VSYNC_FIELD_UNKNOWN (0) + #define VIDEO_VSYNC_FIELD_ODD (1) + #define VIDEO_VSYNC_FIELD_EVEN (2) + #define VIDEO_VSYNC_FIELD_PROGRESSIVE (3) + +Constants +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - :rspan:`3` _`Decoder command` + + - ``VIDEO_CMD_PLAY`` + + - Start playback. + + - .. + + - ``VIDEO_CMD_STOP`` + + - Stop playback. + + - .. + + - ``VIDEO_CMD_FREEZE`` + + - Freeze playback. + + - .. + + - ``VIDEO_CMD_CONTINUE`` + + - Continue playback after freeze. + + - .. + + - Flags for ``VIDEO_CMD_FREEZE`` + + - ``VIDEO_CMD_FREEZE_TO_BLACK`` + + - Show black picture on freeze. + + - .. + + - :rspan:`1` Flags for ``VIDEO_CMD_STOP`` + + - ``VIDEO_CMD_STOP_TO_BLACK`` + + - Show black picture on stop. + + - .. + + - ``VIDEO_CMD_STOP_IMMEDIATELY`` + + - Stop immediately, without emptying buffers. + + - .. + + - :rspan:`1` _`Play input formats` + + - ``VIDEO_PLAY_FMT_NONE`` + + - The decoder has no special format requirements + + - .. + + - ``VIDEO_PLAY_FMT_GOP`` + + - The decoder requires full GOPs + + - .. + + - :rspan:`3` Field order + + - ``VIDEO_VSYNC_FIELD_UNKNOWN`` + + - FIELD_UNKNOWN can be used if the hardware does not know + whether the Vsync is for an odd, even or progressive + (i.e. non-interlaced) field. + + - .. + + - ``VIDEO_VSYNC_FIELD_ODD`` + + - Vsync is for an odd field. + + - .. + + - ``VIDEO_VSYNC_FIELD_EVEN`` + + - Vsync is for an even field. + + - .. + + - ``VIDEO_VSYNC_FIELD_PROGRESSIVE`` + + - progressive (i.e. non-interlaced) + + +----- + + +video_event +----------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + struct video_event { + __s32 type; + #define VIDEO_EVENT_SIZE_CHANGED 1 + #define VIDEO_EVENT_FRAME_RATE_CHANGED 2 + #define VIDEO_EVENT_DECODER_STOPPED 3 + #define VIDEO_EVENT_VSYNC 4 + long timestamp; + union { + video_size_t size; + unsigned int frame_rate; + unsigned char vsync_field; + } u; + }; + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - :rspan:`4` ``__s32 type`` + + - :cspan:`1` Event type. + + - .. + + - ``VIDEO_EVENT_SIZE_CHANGED`` + + - Size changed. + + - .. + + - ``VIDEO_EVENT_FRAME_RATE_CHANGED`` + + - Framerate changed. + + - .. + + - ``VIDEO_EVENT_DECODER_STOPPED`` + + - Decoder stopped. + + - .. + + - ``VIDEO_EVENT_VSYNC`` + + - Vsync occurred. + + - .. + + - ``long timestamp`` + + - :cspan:`1` MPEG PTS at occurrence. + + - .. + + - :rspan:`2` ``union u`` + + - `video_size_t`_ size + + - Resolution and aspect ratio of the video. + + - .. + + - ``unsigned int frame_rate`` + + - in frames per 1000sec + + - .. + + - ``unsigned char vsync_field`` + + - | unknown / odd / even / progressive + | See: `Predefined decoder commands and flags`_ + +Description +~~~~~~~~~~~ + +This is the structure of a video event as it is returned by the +`VIDEO_GET_EVENT`_ call. See there for more details. + + +----- + + +video_status +------------ + +Synopsis +~~~~~~~~ + +The `VIDEO_GET_STATUS`_ call returns the following structure informing +about various states of the playback operation. + +.. code-block:: c + + struct video_status { + int video_blank; + video_play_state_t play_state; + video_stream_source_t stream_source; + video_format_t video_format; + video_displayformat_t display_format; + }; + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - :rspan:`2` ``int video_blank`` + + - :cspan:`1` Show blank video on freeze? + + - .. + + - TRUE ( != 0 ) + + - Blank screen when freeze. + + - .. + + - FALSE ( == 0 ) + + - Show last decoded frame. + + - .. + + - `video_play_state_t`_ ``play_state`` + + - Current state of playback. + + - .. + + - `video_stream_source_t`_ ``stream_source`` + + - Current source (demux/memory). + + - .. + + - `video_format_t`_ ``video_format`` + + - Current aspect ratio of stream. + + - .. + + - `video_displayformat_t`_ ``display_format`` + + - Applied cropping mode. + +Description +~~~~~~~~~~~ + +If ``video_blank`` is set ``TRUE`` video will be blanked out if the +channel is changed or if playback is stopped. Otherwise, the last picture +will be displayed. ``play_state`` indicates if the video is currently +frozen, stopped, or being played back. The ``stream_source`` corresponds +to the selected source for the video stream. It can come either from the +demultiplexer or from memory. The ``video_format`` indicates the aspect +ratio (one of 4:3 or 16:9) of the currently played video stream. +Finally, ``display_format`` corresponds to the applied cropping mode in +case the source video format is not the same as the format of the output +device. + + +----- + + +video_still_picture +------------------- + +Synopsis +~~~~~~~~ + +.. code-block:: c + + struct video_still_picture { + char *iFrame; + int32_t size; + }; + +Variables +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``char *iFrame`` + + - Pointer to a single iframe in memory. + + - .. + + - ``int32_t size`` + + - Size of the iframe. + + +Description +~~~~~~~~~~~ + +An I-frame displayed via the `VIDEO_STILLPICTURE`_ call is passed on +within this structure. + + +----- + + +video capabilities +------------------ + +Synopsis +~~~~~~~~ + +.. code-block:: c + + #define VIDEO_CAP_MPEG1 1 + #define VIDEO_CAP_MPEG2 2 + #define VIDEO_CAP_SYS 4 + #define VIDEO_CAP_PROG 8 + +Constants +~~~~~~~~~ +Bit definitions for capabilities: + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``VIDEO_CAP_MPEG1`` + + - :cspan:`1` The hardware can decode MPEG1. + + - .. + + - ``VIDEO_CAP_MPEG2`` + + - The hardware can decode MPEG2. + + - .. + + - ``VIDEO_CAP_SYS`` + + - The video device accepts system stream. + + You still have to open the video and the audio device + but only send the stream to the video device. + + - .. + + - ``VIDEO_CAP_PROG`` + + - The video device accepts program stream. + + You still have to open the video and the audio device + but only send the stream to the video device. + +Description +~~~~~~~~~~~ + +A call to `VIDEO_GET_CAPABILITIES`_ returns an unsigned integer with the +following bits set according to the hardware's capabilities. + + +----- + + +Video Function Calls +==================== + + +VIDEO_STOP +---------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_STOP + +.. code-block:: c + + int ioctl(fd, VIDEO_STOP, int mode) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - :cspan:`1` Equals ``VIDEO_STOP`` for this command. + + - .. + + - :rspan:`2` ``int mode`` + + - :cspan:`1` Indicates how the screen shall be handled. + + - .. + + - TRUE ( != 0 ) + + - Blank screen when stop. + + - .. + + - FALSE ( == 0 ) + + - Show last decoded frame. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is for Digital TV devices only. To control a V4L2 decoder use +the V4L2 :ref:`VIDIOC_DECODER_CMD` instead. + +This ioctl call asks the Video Device to stop playing the current +stream. Depending on the input parameter, the screen can be blanked out +or displaying the last decoded frame. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_PLAY +---------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_PLAY + +.. code-block:: c + + int ioctl(fd, VIDEO_PLAY) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_PLAY`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is for Digital TV devices only. To control a V4L2 decoder use +the V4L2 :ref:`VIDIOC_DECODER_CMD` instead. + +This ioctl call asks the Video Device to start playing a video stream +from the selected source. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_FREEZE +------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_FREEZE + +.. code-block:: c + + int ioctl(fd, VIDEO_FREEZE) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_FREEZE`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is for Digital TV devices only. To control a V4L2 decoder use +the V4L2 :ref:`VIDIOC_DECODER_CMD` instead. + +This ioctl call suspends the live video stream being played, if +VIDEO_SOURCE_DEMUX is selected. Decoding and playing are frozen. +It is then possible to restart the decoding and playing process of the +video stream using the `VIDEO_CONTINUE`_ command. +If VIDEO_SOURCE_MEMORY is selected in the ioctl call +`VIDEO_SELECT_SOURCE`_, the Digital TV subsystem will not decode any more +data until the ioctl call `VIDEO_CONTINUE`_ or `VIDEO_PLAY`_ is performed. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_CONTINUE +-------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_CONTINUE + +.. code-block:: c + + int ioctl(fd, VIDEO_CONTINUE) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_CONTINUE`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is for Digital TV devices only. To control a V4L2 decoder use +the V4L2 :ref:`VIDIOC_DECODER_CMD` instead. + +This ioctl call restarts decoding and playing processes of the video +stream which was played before a call to `VIDEO_FREEZE`_ was made. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_SELECT_SOURCE +------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_SELECT_SOURCE + +.. code-block:: c + + int ioctl(fd, VIDEO_SELECT_SOURCE, video_stream_source_t source) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_SELECT_SOURCE`` for this command. + + - .. + + - `video_stream_source_t`_ ``source`` + + - Indicates which source shall be used for the Video stream. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is for Digital TV devices only. This ioctl was also supported +by the V4L2 ivtv driver, but that has been replaced by the ivtv-specific +``IVTV_IOC_PASSTHROUGH_MODE`` ioctl. + +This ioctl call informs the video device which source shall be used for +the input data. The possible sources are demux or memory. If memory is +selected, the data is fed to the video device through the write command +using the struct `video_stream_source_t`_. If demux is selected, the data +is directly transferred from the onboard demux-device to the decoder. + +The data fed to the decoder is also controlled by the PID-filter. +Output selection: :c:type:`dmx_output` ``DMX_OUT_DECODER``. + + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_SET_BLANK +--------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_SET_BLANK + +.. code-block:: c + + int ioctl(fd, VIDEO_SET_BLANK, int mode) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - :cspan:`1` Equals ``VIDEO_SET_BLANK`` for this command. + + - .. + + - :rspan:`2` ``int mode`` + + - :cspan:`1` Indicates if the screen shall be blanked. + + - .. + + - TRUE ( != 0 ) + + - Blank screen when stop. + + - .. + + - FALSE ( == 0 ) + + - Show last decoded frame. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Video Device to blank out the picture. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_GET_STATUS +---------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_GET_STATUS + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_GET_STATUS, + struct video_status *status) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_GET_STATUS`` for this command. + + - .. + + - ``struct`` `video_status`_ ``*status`` + + - Returns the current status of the Video Device. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Video Device to return the current status of +the device. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_GET_EVENT +--------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_GET_EVENT + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_GET_EVENT, + struct video_event *ev) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_GET_EVENT`` for this command. + + - .. + + - ``struct`` `video_event`_ ``*ev`` + + - Points to the location where the event, if any, is to be stored. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl is for DVB devices only. To get events from a V4L2 decoder +use the V4L2 :ref:`VIDIOC_DQEVENT` ioctl instead. + +This ioctl call returns an event of type `video_event`_ if available. A +certain number of the latest events will be cued and returned in order of +occurrence. Older events may be discarded if not fetched in time. If +an event is not available, the behavior depends on whether the device is +in blocking or non-blocking mode. In the latter case, the call fails +immediately with errno set to ``EWOULDBLOCK``. In the former case, the +call blocks until an event becomes available. The standard Linux poll() +and/or select() system calls can be used with the device file descriptor +to watch for new events. For select(), the file descriptor should be +included in the exceptfds argument, and for poll(), POLLPRI should be +specified as the wake-up condition. Read-only permissions are sufficient +for this ioctl call. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EWOULDBLOCK`` + + - :cspan:`1` There is no event pending, and the device is in + non-blocking mode. + + - .. + + - ``EOVERFLOW`` + + - Overflow in event queue - one or more events were lost. + + +----- + + +VIDEO_SET_DISPLAY_FORMAT +------------------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_SET_DISPLAY_FORMAT + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_SET_DISPLAY_FORMAT, + video_display_format_t format) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_SET_DISPLAY_FORMAT`` for this command. + + - .. + + - `video_displayformat_t`_ ``format`` + + - Selects the video format to be used. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Video Device to select the video format to be +applied by the MPEG chip on the video. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_STILLPICTURE +------------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_STILLPICTURE + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_STILLPICTURE, + struct video_still_picture *sp) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_STILLPICTURE`` for this command. + + - .. + + - ``struct`` `video_still_picture`_ ``*sp`` + + - Pointer to the location where the struct with the I-frame + and size is stored. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Video Device to display a still picture +(I-frame). The input data shall be the section of an elementary video +stream containing an I-frame. Typically this section is extracted from a +TS or PES recording. Resolution and codec (see `video capabilities`_) must +be supported by the device. If the pointer is NULL, then the current +displayed still picture is blanked. + +e.g. The AV7110 supports MPEG1 and MPEG2 with the common PAL-SD +resolutions. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_FAST_FORWARD +------------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_FAST_FORWARD + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_FAST_FORWARD, int nFrames) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_FAST_FORWARD`` for this command. + + - .. + + - ``int nFrames`` + + - The number of frames to skip. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the Video Device to skip decoding of N number of +I-frames. This call can only be used if ``VIDEO_SOURCE_MEMORY`` is +selected. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EPERM`` + + - Mode ``VIDEO_SOURCE_MEMORY`` not selected. + + +----- + + +VIDEO_SLOWMOTION +---------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_SLOWMOTION + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_SLOWMOTION, int nFrames) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_SLOWMOTION`` for this command. + + - .. + + - ``int nFrames`` + + - The number of times to repeat each frame. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the video device to repeat decoding frames N number +of times. This call can only be used if ``VIDEO_SOURCE_MEMORY`` is +selected. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EPERM`` + + - Mode ``VIDEO_SOURCE_MEMORY`` not selected. + + +----- + + +VIDEO_GET_CAPABILITIES +---------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_GET_CAPABILITIES + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_GET_CAPABILITIES, unsigned int *cap) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_GET_CAPABILITIES`` for this command. + + - .. + + - ``unsigned int *cap`` + + - Pointer to a location where to store the capability information. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call asks the video device about its decoding capabilities. +On success it returns an integer which has bits set according to the +defines in `video capabilities`_. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_CLEAR_BUFFER +------------------ + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_CLEAR_BUFFER + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_CLEAR_BUFFER) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_CLEAR_BUFFER`` for this command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl call clears all video buffers in the driver and in the +decoder hardware. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_SET_STREAMTYPE +-------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_SET_STREAMTYPE + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_SET_STREAMTYPE, int type) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_SET_STREAMTYPE`` for this command. + + - .. + + - ``int type`` + + - Stream type. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl tells the driver which kind of stream to expect being written +to it. +Intelligent decoder might also not support or ignore (like the AV7110) +this call and determine the stream type themselves. + +Currently used stream types: + +.. flat-table:: + :header-rows: 1 + :stub-columns: 0 + + - .. + + - Codec + + - Stream type + + - .. + + - MPEG2 + + - 0 + + - .. + + - MPEG4 h.264 + + - 1 + + - .. + + - VC1 + + - 3 + + - .. + + - MPEG4 Part2 + + - 4 + + - .. + + - VC1 SM + + - 5 + + - .. + + - MPEG1 + + - 6 + + - .. + + - HEVC h.265 + + - | 7 + | DREAMBOX: 22 + + - .. + + - AVS + + - 16 + + - .. + + - AVS2 + + - 40 + +Not every decoder supports all stream types. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_SET_FORMAT +---------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_SET_FORMAT + +.. code-block:: c + + int ioctl(fd, int request = VIDEO_SET_FORMAT, video_format_t format) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_SET_FORMAT`` for this command. + + - .. + + - `video_format_t`_ ``format`` + + - Video format of TV as defined in section `video_format_t`_. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl sets the screen format (aspect ratio) of the connected output +device (TV) so that the output of the decoder can be adjusted +accordingly. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_GET_SIZE +-------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_GET_SIZE + +.. code-block:: c + + int ioctl(int fd, int request = VIDEO_GET_SIZE, video_size_t *size) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call, + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_GET_SIZE`` for this command. + + - .. + + - `video_size_t`_ ``*size`` + + - Returns the size and aspect ratio. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +This ioctl returns the size and aspect ratio. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_GET_PTS +------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_GET_PTS + +.. code-block:: c + + int ioctl(int fd, int request = VIDEO_GET_PTS, __u64 *pts) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_GET_PTS`` for this command. + + - .. + + - ``__u64 *pts`` + + - Returns the 33-bit timestamp as defined in ITU T-REC-H.222.0 / + ISO/IEC 13818-1. + + The PTS should belong to the currently played frame if possible, + but may also be a value close to it like the PTS of the last + decoded frame or the last PTS extracted by the PES parser. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +For V4L2 decoders this ioctl has been replaced by the +``V4L2_CID_MPEG_VIDEO_DEC_PTS`` control. + +This ioctl call asks the Video Device to return the current PTS +timestamp. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_GET_FRAME_COUNT +--------------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_GET_FRAME_COUNT + +.. code-block:: c + + int ioctl(int fd, VIDEO_GET_FRAME_COUNT, __u64 *pts) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_GET_FRAME_COUNT`` for this command. + + - .. + + - ``__u64 *pts`` + + - Returns the number of frames displayed since the decoder was + started. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +For V4L2 decoders this ioctl has been replaced by the +``V4L2_CID_MPEG_VIDEO_DEC_FRAME`` control. + +This ioctl call asks the Video Device to return the number of displayed +frames since the decoder was started. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_COMMAND +------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_COMMAND + +.. code-block:: c + + int ioctl(int fd, int request = VIDEO_COMMAND, + struct video_command *cmd) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_COMMAND`` for this command. + + - .. + + - `struct video_command`_ ``*cmd`` + + - Commands the decoder. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +For V4L2 decoders this ioctl has been replaced by the +:ref:`VIDIOC_DECODER_CMD` ioctl. + +This ioctl commands the decoder. The `struct video_command`_ is a +subset of the ``v4l2_decoder_cmd`` struct, so refer to the +:ref:`VIDIOC_DECODER_CMD` documentation for +more information. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +VIDEO_TRY_COMMAND +----------------- + +Synopsis +~~~~~~~~ + +.. c:macro:: VIDEO_TRY_COMMAND + +.. code-block:: c + + int ioctl(int fd, int request = VIDEO_TRY_COMMAND, + struct video_command *cmd) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``int request`` + + - Equals ``VIDEO_TRY_COMMAND`` for this command. + + - .. + + - `struct video_command`_ ``*cmd`` + + - Try a decoder command. + +Description +~~~~~~~~~~~ + +.. attention:: Do **not** use in new drivers! + See: :ref:`legacy_dvb_decoder_notes` + +For V4L2 decoders this ioctl has been replaced by the +:ref:`VIDIOC_TRY_DECODER_CMD <VIDIOC_DECODER_CMD>` ioctl. + +This ioctl tries a decoder command. The `struct video_command`_ is a +subset of the ``v4l2_decoder_cmd`` struct, so refer to the +:ref:`VIDIOC_TRY_DECODER_CMD <VIDIOC_DECODER_CMD>` documentation +for more information. + +Return Value +~~~~~~~~~~~~ + +On success 0 is returned, on error -1 and the ``errno`` variable is set +appropriately. The generic error codes are described at the +:ref:`Generic Error Codes <gen-errors>` chapter. + + +----- + + +open() +------ + +Synopsis +~~~~~~~~ + +.. code-block:: c + + #include <fcntl.h> + +.. c:function:: int open(const char *deviceName, int flags) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``const char *deviceName`` + + - Name of specific video device. + + - .. + + - :rspan:`3` ``int flags`` + + - :cspan:`1` A bit-wise OR of the following flags: + + - .. + + - ``O_RDONLY`` + + - read-only access + + - .. + + - ``O_RDWR`` + + - read/write access + + - .. + + - ``O_NONBLOCK`` + - | Open in non-blocking mode + | (blocking mode is the default) + +Description +~~~~~~~~~~~ + +This system call opens a named video device (e.g. +/dev/dvb/adapter?/video?) for subsequent use. + +When an open() call has succeeded, the device will be ready for use. The +significance of blocking or non-blocking mode is described in the +documentation for functions where there is a difference. It does not +affect the semantics of the open() call itself. A 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. Only one +user can open the Video Device in O_RDWR mode. All other attempts to +open the device in this mode will fail, and an error-code will be +returned. If the Video Device is opened in O_RDONLY mode, the only +ioctl call that can be used is `VIDEO_GET_STATUS`_. All other call will +return an error code. + +Return Value +~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``ENODEV`` + + - :cspan:`1` Device driver not loaded/available. + + - .. + + - ``EINTERNAL`` + + - Internal error. + + - .. + + - ``EBUSY`` + + - Device or resource busy. + + - .. + + - ``EINVAL`` + + - Invalid argument. + + +----- + + +close() +------- + +Synopsis +~~~~~~~~ + +.. c:function:: int close(int fd) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + +Description +~~~~~~~~~~~ + +This system call closes a previously opened video device. + +Return Value +~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EBADF`` + + - fd is not a valid open file descriptor. + + +----- + + +write() +------- + +Synopsis +~~~~~~~~ + +.. c:function:: size_t write(int fd, const void *buf, size_t count) + +Arguments +~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``int fd`` + + - :cspan:`1` File descriptor returned by a previous call + to `open()`_. + + - .. + + - ``void *buf`` + + - Pointer to the buffer containing the PES data. + + - .. + + - ``size_t count`` + + - Size of buf. + +Description +~~~~~~~~~~~ + +This system call can only be used if VIDEO_SOURCE_MEMORY is selected +in the ioctl call `VIDEO_SELECT_SOURCE`_. The data provided shall be in +PES format, unless the capability allows other formats. TS is the +most common format for storing DVB-data, it is usually supported too. +If O_NONBLOCK is not specified the function will block until buffer space +is available. The amount of data to be transferred is implied by count. + +.. note:: See: :ref:`DVB Data Formats <legacy_dvb_decoder_formats>` + +Return Value +~~~~~~~~~~~~ + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + - .. + + - ``EPERM`` + + - :cspan:`1` Mode ``VIDEO_SOURCE_MEMORY`` not selected. + + - .. + + - ``ENOMEM`` + + - Attempted to write more data than the internal buffer can hold. + + - .. + + - ``EBADF`` + + - fd is not a valid open file descriptor. diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-client-cap.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-client-cap.rst index 810b6a859d..da4a358ce7 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-client-cap.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-client-cap.rst @@ -61,6 +61,21 @@ been accepted. A common case for the kernel not accepting a capability is that the kernel is older than the headers the userspace uses, and thus the capability is unknown to the kernel. +.. tabularcolumns:: |p{1.5cm}|p{2.9cm}|p{12.9cm}| + +.. c:type:: v4l2_subdev_client_capability + +.. flat-table:: struct v4l2_subdev_client_capability + :header-rows: 0 + :stub-columns: 0 + :widths: 3 4 20 + + * - __u64 + - ``capabilities`` + - Sub-device client capabilities of the opened device. + +.. tabularcolumns:: |p{6.8cm}|p{2.4cm}|p{8.1cm}| + .. flat-table:: Client Capabilities :header-rows: 1 |