From 7976b003e8bd0f95187e7f7f841ad6501b4c3f01 Mon Sep 17 00:00:00 2001 From: Stefan Herdler Date: Mon, 29 Jan 2024 00:32:45 +0100 Subject: media: docs: uAPI: dvb/osd: completing the documentation The existing documentation of the legacy DVB Decoder API was incomplete. Revising the documentation, adding missing parts and arranging the documentation files new. This patch contains the documentation of osd.h. Link: https://lore.kernel.org/linux-media/20240128233249.32794-3-herdler@nurfuerspam.de Signed-off-by: Stefan Herdler Signed-off-by: Mauro Carvalho Chehab --- .../userspace-api/media/dvb/legacy_dvb_osd.rst | 883 +++++++++++++++++++++ 1 file changed, 883 insertions(+) create mode 100644 Documentation/userspace-api/media/dvb/legacy_dvb_osd.rst (limited to 'Documentation/userspace-api') 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 000000000000..179b66a8016a --- /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 . + | Returns 0 on success. + + - .. + + - ``OSD_SetColor`` + + - | color, + | R{x0},G{y0},B{x1}, + | opacity{y1} + + - | Set palette entry to , and 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 , to color number . + | Returns 0 on success, -1 on error. + + - .. + + - ``OSD_GetPixel`` + + - x0,y0 + + - | Returns color number of pixel ,, 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 . + | 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 . + | 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 . + | 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 . + + - .. + + - ``OSD_SetWindow`` + + - x0 + + - Set window with number 0` 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 ` chapter. + +.. flat-table:: + :header-rows: 0 + :stub-columns: 0 + + + - .. + + - ``EINVAL`` + + - Unsupported capability. + + +----- + + +open() +------ + +Synopsis +~~~~~~~~ + +.. code-block:: c + + #include + +.. 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. -- cgit v1.2.3