354 lines
13 KiB
C
354 lines
13 KiB
C
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/*
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* VIDEO MOTION CODECs internal API for video devices
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*
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* Interface for MJPEG (and maybe later MPEG/WAVELETS) codec's
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* bound to a master device.
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*
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* (c) 2002 Wolfgang Scherr <scherr@net4you.at>
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*
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* $Id: videocodec.h,v 1.1.2.4 2003/01/14 21:15:03 rbultje Exp $
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*
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* ------------------------------------------------------------------------
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* ------------------------------------------------------------------------
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*/
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/* =================== */
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/* general description */
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/* =================== */
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/* Should ease the (re-)usage of drivers supporting cards with (different)
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video codecs. The codecs register to this module their functionality,
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and the processors (masters) can attach to them if they fit.
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The codecs are typically have a "strong" binding to their master - so I
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don't think it makes sense to have a full blown interfacing as with e.g.
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i2c. If you have an other opinion, let's discuss & implement it :-)))
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Usage:
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The slave has just to setup the videocodec structure and use two functions:
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videocodec_register(codecdata);
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videocodec_unregister(codecdata);
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The best is just calling them at module (de-)initialisation.
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The master sets up the structure videocodec_master and calls:
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codecdata=videocodec_attach(master_codecdata);
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videocodec_detach(codecdata);
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The slave is called during attach/detach via functions setup previously
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during register. At that time, the master_data pointer is set up
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and the slave can access any io registers of the master device (in the case
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the slave is bound to it). Otherwise it doesn't need this functions and
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therfor they may not be initialized.
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The other functions are just for convenience, as they are for sure used by
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most/all of the codecs. The last ones may be omitted, too.
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See the structure declaration below for more information and which data has
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to be set up for the master and the slave.
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----------------------------------------------------------------------------
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The master should have "knowledge" of the slave and vice versa. So the data
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structures sent to/from slave via set_data/get_data set_image/get_image are
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device dependent and vary between MJPEG/MPEG/WAVELET/... devices. (!!!!)
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----------------------------------------------------------------------------
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*/
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/* ========================================== */
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/* description of the videocodec_io structure */
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/* ========================================== */
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/*
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==== master setup ====
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name -> name of the device structure for reference and debugging
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master_data -> data ref. for the master (e.g. the zr36055,57,67)
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readreg -> ref. to read-fn from register (setup by master, used by slave)
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writereg -> ref. to write-fn to register (setup by master, used by slave)
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this two functions do the lowlevel I/O job
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==== slave functionality setup ====
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slave_data -> data ref. for the slave (e.g. the zr36050,60)
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check -> fn-ref. checks availability of an device, returns -EIO on failure or
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the type on success
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this makes espcecially sense if a driver module supports more than
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one codec which may be quite similar to access, nevertheless it
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is good for a first functionality check
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-- main functions you always need for compression/decompression --
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set_mode -> this fn-ref. resets the entire codec, and sets up the mode
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with the last defined norm/size (or device default if not
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available) - it returns 0 if the mode is possible
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set_size -> this fn-ref. sets the norm and image size for
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compression/decompression (returns 0 on success)
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the norm param is defined in videodev2.h (V4L2_STD_*)
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additional setup may be available, too - but the codec should work with
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some default values even without this
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set_data -> sets device-specific data (tables, quality etc.)
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get_data -> query device-specific data (tables, quality etc.)
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if the device delivers interrupts, they may be setup/handled here
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setup_interrupt -> codec irq setup (not needed for 36050/60)
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handle_interrupt -> codec irq handling (not needed for 36050/60)
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if the device delivers pictures, they may be handled here
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put_image -> puts image data to the codec (not needed for 36050/60)
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get_image -> gets image data from the codec (not needed for 36050/60)
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the calls include frame numbers and flags (even/odd/...)
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if needed and a flag which allows blocking until its ready
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*/
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/* ============== */
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/* user interface */
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/* ============== */
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/*
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Currently there is only a information display planned, as the layer
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is not visible for the user space at all.
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Information is available via procfs. The current entry is "/proc/videocodecs"
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but it makes sense to "hide" it in the /proc/video tree of v4l(2) --TODO--.
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A example for such an output is:
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<S>lave or attached <M>aster name type flags magic (connected as)
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S zr36050 0002 0000d001 00000000 (TEMPLATE)
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M zr36055[0] 0001 0000c001 00000000 (zr36050[0])
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M zr36055[1] 0001 0000c001 00000000 (zr36050[1])
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*/
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/* =============================================== */
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/* special defines for the videocodec_io structure */
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/* =============================================== */
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#ifndef __LINUX_VIDEOCODEC_H
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#define __LINUX_VIDEOCODEC_H
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#include <linux/videodev2.h>
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#define CODEC_DO_COMPRESSION 0
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#define CODEC_DO_EXPANSION 1
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/* this are the current codec flags I think they are needed */
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/* -> type value in structure */
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#define CODEC_FLAG_JPEG 0x00000001L // JPEG codec
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#define CODEC_FLAG_MPEG 0x00000002L // MPEG1/2/4 codec
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#define CODEC_FLAG_DIVX 0x00000004L // DIVX codec
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#define CODEC_FLAG_WAVELET 0x00000008L // WAVELET codec
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// room for other types
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#define CODEC_FLAG_MAGIC 0x00000800L // magic key must match
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#define CODEC_FLAG_HARDWARE 0x00001000L // is a hardware codec
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#define CODEC_FLAG_VFE 0x00002000L // has direct video frontend
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#define CODEC_FLAG_ENCODER 0x00004000L // compression capability
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#define CODEC_FLAG_DECODER 0x00008000L // decompression capability
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#define CODEC_FLAG_NEEDIRQ 0x00010000L // needs irq handling
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#define CODEC_FLAG_RDWRPIC 0x00020000L // handles picture I/O
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/* a list of modes, some are just examples (is there any HW?) */
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#define CODEC_MODE_BJPG 0x0001 // Baseline JPEG
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#define CODEC_MODE_LJPG 0x0002 // Lossless JPEG
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#define CODEC_MODE_MPEG1 0x0003 // MPEG 1
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#define CODEC_MODE_MPEG2 0x0004 // MPEG 2
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#define CODEC_MODE_MPEG4 0x0005 // MPEG 4
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#define CODEC_MODE_MSDIVX 0x0006 // MS DivX
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#define CODEC_MODE_ODIVX 0x0007 // Open DivX
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#define CODEC_MODE_WAVELET 0x0008 // Wavelet
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/* this are the current codec types I want to implement */
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/* -> type value in structure */
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#define CODEC_TYPE_NONE 0
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#define CODEC_TYPE_L64702 1
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#define CODEC_TYPE_ZR36050 2
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#define CODEC_TYPE_ZR36016 3
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#define CODEC_TYPE_ZR36060 4
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/* the type of data may be enhanced by future implementations (data-fn.'s) */
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/* -> used in command */
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#define CODEC_G_STATUS 0x0000 /* codec status (query only) */
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#define CODEC_S_CODEC_MODE 0x0001 /* codec mode (baseline JPEG, MPEG1,... */
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#define CODEC_G_CODEC_MODE 0x8001
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#define CODEC_S_VFE 0x0002 /* additional video frontend setup */
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#define CODEC_G_VFE 0x8002
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#define CODEC_S_MMAP 0x0003 /* MMAP setup (if available) */
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#define CODEC_S_JPEG_TDS_BYTE 0x0010 /* target data size in bytes */
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#define CODEC_G_JPEG_TDS_BYTE 0x8010
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#define CODEC_S_JPEG_SCALE 0x0011 /* scaling factor for quant. tables */
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#define CODEC_G_JPEG_SCALE 0x8011
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#define CODEC_S_JPEG_HDT_DATA 0x0018 /* huffman-tables */
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#define CODEC_G_JPEG_HDT_DATA 0x8018
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#define CODEC_S_JPEG_QDT_DATA 0x0019 /* quantizing-tables */
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#define CODEC_G_JPEG_QDT_DATA 0x8019
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#define CODEC_S_JPEG_APP_DATA 0x001A /* APP marker */
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#define CODEC_G_JPEG_APP_DATA 0x801A
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#define CODEC_S_JPEG_COM_DATA 0x001B /* COM marker */
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#define CODEC_G_JPEG_COM_DATA 0x801B
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#define CODEC_S_PRIVATE 0x1000 /* "private" commands start here */
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#define CODEC_G_PRIVATE 0x9000
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#define CODEC_G_FLAG 0x8000 /* this is how 'get' is detected */
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/* types of transfer, directly user space or a kernel buffer (image-fn.'s) */
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/* -> used in get_image, put_image */
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#define CODEC_TRANSFER_KERNEL 0 /* use "memcopy" */
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#define CODEC_TRANSFER_USER 1 /* use "to/from_user" */
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/* ========================= */
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/* the structures itself ... */
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/* ========================= */
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struct vfe_polarity {
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unsigned int vsync_pol:1;
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unsigned int hsync_pol:1;
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unsigned int field_pol:1;
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unsigned int blank_pol:1;
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unsigned int subimg_pol:1;
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unsigned int poe_pol:1;
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unsigned int pvalid_pol:1;
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unsigned int vclk_pol:1;
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};
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struct vfe_settings {
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__u32 x, y; /* Offsets into image */
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__u32 width, height; /* Area to capture */
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__u16 decimation; /* Decimation divider */
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__u16 flags; /* Flags for capture */
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__u16 quality; /* quality of the video */
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};
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struct tvnorm {
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u16 Wt, Wa, HStart, HSyncStart, Ht, Ha, VStart;
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};
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struct jpeg_com_marker {
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int len; /* number of usable bytes in data */
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char data[60];
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};
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struct jpeg_app_marker {
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int appn; /* number app segment */
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int len; /* number of usable bytes in data */
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char data[60];
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};
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struct videocodec {
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struct module *owner;
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/* -- filled in by slave device during register -- */
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char name[32];
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unsigned long magic; /* may be used for client<->master attaching */
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unsigned long flags; /* functionality flags */
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unsigned int type; /* codec type */
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/* -- these is filled in later during master device attach -- */
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struct videocodec_master *master_data;
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/* -- these are filled in by the slave device during register -- */
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void *data; /* private slave data */
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/* attach/detach client functions (indirect call) */
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int (*setup) (struct videocodec * codec);
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int (*unset) (struct videocodec * codec);
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/* main functions, every client needs them for sure! */
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// set compression or decompression (or freeze, stop, standby, etc)
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int (*set_mode) (struct videocodec * codec,
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int mode);
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// setup picture size and norm (for the codec's video frontend)
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int (*set_video) (struct videocodec * codec,
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struct tvnorm * norm,
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struct vfe_settings * cap,
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struct vfe_polarity * pol);
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// other control commands, also mmap setup etc.
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int (*control) (struct videocodec * codec,
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int type,
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int size,
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void *data);
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/* additional setup/query/processing (may be NULL pointer) */
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// interrupt setup / handling (for irq's delivered by master)
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int (*setup_interrupt) (struct videocodec * codec,
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long mode);
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int (*handle_interrupt) (struct videocodec * codec,
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int source,
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long flag);
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// picture interface (if any)
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long (*put_image) (struct videocodec * codec,
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int tr_type,
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int block,
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long *fr_num,
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long *flag,
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long size,
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void *buf);
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long (*get_image) (struct videocodec * codec,
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int tr_type,
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int block,
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long *fr_num,
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long *flag,
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long size,
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void *buf);
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};
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struct videocodec_master {
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/* -- filled in by master device for registration -- */
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char name[32];
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unsigned long magic; /* may be used for client<->master attaching */
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unsigned long flags; /* functionality flags */
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unsigned int type; /* master type */
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void *data; /* private master data */
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__u32(*readreg) (struct videocodec * codec,
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__u16 reg);
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void (*writereg) (struct videocodec * codec,
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__u16 reg,
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__u32 value);
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};
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/* ================================================= */
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/* function prototypes of the master/slave interface */
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/* ================================================= */
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/* attach and detach commands for the master */
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// * master structure needs to be kmalloc'ed before calling attach
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// and free'd after calling detach
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// * returns pointer on success, NULL on failure
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extern struct videocodec *videocodec_attach(struct videocodec_master *);
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// * 0 on success, <0 (errno) on failure
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extern int videocodec_detach(struct videocodec *);
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/* register and unregister commands for the slaves */
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// * 0 on success, <0 (errno) on failure
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extern int videocodec_register(const struct videocodec *);
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// * 0 on success, <0 (errno) on failure
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extern int videocodec_unregister(const struct videocodec *);
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/* the other calls are directly done via the videocodec structure! */
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#endif /*ifndef __LINUX_VIDEOCODEC_H */
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