media: Documentation/media: rename "Codec Interface"

The "Codec Interface" chapter is poorly named since codecs are just one
use-case of the Memory-to-Memory Interface. Rename it and clean up the
text a bit.
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: NTomasz Figa <tfiga@chromium.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/media/uapi/mediactl/request-api.rst

@@ -91,7 +91,7 @@ A request must contain at least one buffer, otherwise ``ENOENT`` is returned.
 A queued request cannot be modified anymore.
 
 .. caution::
-   For :ref:`memory-to-memory devices <codec>` you can use requests only for
+   For :ref:`memory-to-memory devices <mem2mem>` you can use requests only for
    output buffers, not for capture buffers. Attempting to add a capture buffer
    to a request will result in an ``EACCES`` error.
 
@@ -152,7 +152,7 @@ if it had just been allocated.
 Example for a Codec Device
 --------------------------
 
-For use-cases such as :ref:`codecs <codec>`, the request API can be used
+For use-cases such as :ref:`codecs <mem2mem>`, the request API can be used
 to associate specific controls to
 be applied by the driver for the OUTPUT buffer, allowing user-space
 to queue many such buffers in advance. It can also take advantage of requests'

Documentation/media/uapi/v4l/dev-codec.rst → Documentation/media/uapi/v4l/dev-mem2mem.rst

@@ -7,37 +7,36 @@
 ..
 .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
 
-.. _codec:
+.. _mem2mem:
 
-***************
-Codec Interface
-***************
+********************************
+Video Memory-To-Memory Interface
+********************************
 
-A V4L2 codec can compress, decompress, transform, or otherwise convert
-video data from one format into another format, in memory. Typically
-such devices are memory-to-memory devices (i.e. devices with the
-``V4L2_CAP_VIDEO_M2M`` or ``V4L2_CAP_VIDEO_M2M_MPLANE`` capability set).
+A V4L2 memory-to-memory device can compress, decompress, transform, or
+otherwise convert video data from one format into another format, in memory.
+Such memory-to-memory devices set the ``V4L2_CAP_VIDEO_M2M`` or
+``V4L2_CAP_VIDEO_M2M_MPLANE`` capability. Examples of memory-to-memory
+devices are codecs, scalers, deinterlacers or format converters (i.e.
+converting from YUV to RGB).
 
 A memory-to-memory video node acts just like a normal video node, but it
-supports both output (sending frames from memory to the codec hardware)
-and capture (receiving the processed frames from the codec hardware into
+supports both output (sending frames from memory to the hardware)
+and capture (receiving the processed frames from the hardware into
 memory) stream I/O. An application will have to setup the stream I/O for
 both sides and finally call :ref:`VIDIOC_STREAMON <VIDIOC_STREAMON>`
-for both capture and output to start the codec.
-
-Video compression codecs use the MPEG controls to setup their codec
-parameters
-
-.. note::
-
-   The MPEG controls actually support many more codecs than
-   just MPEG. See :ref:`mpeg-controls`.
+for both capture and output to start the hardware.
 
 Memory-to-memory devices function as a shared resource: you can
 open the video node multiple times, each application setting up their
-own codec properties that are local to the file handle, and each can use
+own properties that are local to the file handle, and each can use
 it independently from the others. The driver will arbitrate access to
-the codec and reprogram it whenever another file handler gets access.
+the hardware and reprogram it whenever another file handler gets access.
 This is different from the usual video node behavior where the video
 properties are global to the device (i.e. changing something through one
 file handle is visible through another file handle).
+
+One of the most common memory-to-memory device is the codec. Codecs
+are more complicated than most and require additional setup for
+their codec parameters. This is done through codec controls.
+See :ref:`mpeg-controls`.

Documentation/media/uapi/v4l/devices.rst

@@ -21,7 +21,7 @@ Interfaces
     dev-overlay
     dev-output
     dev-osd
-    dev-codec
+    dev-mem2mem
     dev-raw-vbi
     dev-sliced-vbi
     dev-radio

Documentation/media/uapi/v4l/pixfmt-compressed.rst

@@ -73,7 +73,7 @@ Compressed Formats
       - 'MG2S'
       - MPEG-2 parsed slice data, as extracted from the MPEG-2 bitstream.
 	This format is adapted for stateless video decoders that implement a
-	MPEG-2 pipeline (using the :ref:`codec` and :ref:`media-request-api`).
+	MPEG-2 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
 	Metadata associated with the frame to decode is required to be passed
 	through the ``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS`` control and
 	quantization matrices can optionally be specified through the

Documentation/media/uapi/v4l/vidioc-qbuf.rst

@@ -123,7 +123,7 @@ then ``EINVAL`` will be returned.
    :ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` or calling :ref:`VIDIOC_REQBUFS`
    the check for this will be reset.
 
-   For :ref:`memory-to-memory devices <codec>` you can specify the
+   For :ref:`memory-to-memory devices <mem2mem>` you can specify the
    ``request_fd`` only for output buffers, not for capture buffers. Attempting
    to specify this for a capture buffer will result in an ``EACCES`` error.