[net-next-2.6.git] / drivers / media / video / pwc / pwc-uncompress.c

/* Linux driver for Philips webcam
   Decompression frontend.
   (C) 1999-2003 Nemosoft Unv.
   (C) 2004-2006 Luc Saillard (luc@saillard.org)

   NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
   driver and thus may have bugs that are not present in the original version.
   Please send bug reports and support requests to <luc@saillard.org>.
   The decompression routines have been implemented by reverse-engineering the
   Nemosoft binary pwcx module. Caveat emptor.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

   vim: set ts=8:
*/

#include <asm/current.h>
#include <asm/types.h>

#include "pwc.h"
#include "pwc-uncompress.h"
#include "pwc-dec1.h"
#include "pwc-dec23.h"

int pwc_decompress(struct pwc_device *pdev)
{
	struct pwc_frame_buf *fbuf;
	int n, line, col, stride;
	void *yuv, *image;
	u16 *src;
	u16 *dsty, *dstu, *dstv;

	if (pdev == NULL)
		return -EFAULT;

	fbuf = pdev->read_frame;
	if (fbuf == NULL)
		return -EFAULT;
	image  = pdev->image_data;
	image += pdev->images[pdev->fill_image].offset;

	yuv = fbuf->data + pdev->frame_header_size;  /* Skip header */

	/* Raw format; that's easy... */
	if (pdev->pixfmt != V4L2_PIX_FMT_YUV420)
	{
		struct pwc_raw_frame *raw_frame = image;
		raw_frame->type = cpu_to_le16(pdev->type);
		raw_frame->vbandlength = cpu_to_le16(pdev->vbandlength);
			/* cmd_buf is always 4 bytes, but sometimes, only the
			 * first 3 bytes is filled (Nala case). We can
			 * determine this using the type of the webcam */
		memcpy(raw_frame->cmd, pdev->cmd_buf, 4);
		memcpy(raw_frame+1, yuv, pdev->frame_size);
		return 0;
	}

	if (pdev->vbandlength == 0) {
		/* Uncompressed mode.
		 * We copy the data into the output buffer, using the viewport
		 * size (which may be larger than the image size).
		 * Unfortunately we have to do a bit of byte stuffing to get
		 * the desired output format/size.
		 *
		 * We do some byte shuffling here to go from the
		 * native format to YUV420P.
		 */
		src = (u16 *)yuv;
		n = pdev->view.x * pdev->view.y;

		/* offset in Y plane */
		stride = pdev->view.x * pdev->offset.y + pdev->offset.x;
		dsty = (u16 *)(image + stride);

		/* offsets in U/V planes */
		stride = pdev->view.x * pdev->offset.y / 4 + pdev->offset.x / 2;
		dstu = (u16 *)(image + n +         stride);
		dstv = (u16 *)(image + n + n / 4 + stride);

		/* increment after each line */
		stride = (pdev->view.x - pdev->image.x) / 2; /* u16 is 2 bytes */

		for (line = 0; line < pdev->image.y; line++) {
			for (col = 0; col < pdev->image.x; col += 4) {
				*dsty++ = *src++;
				*dsty++ = *src++;
				if (line & 1)
					*dstv++ = *src++;
				else
					*dstu++ = *src++;
			}
			dsty += stride;
			if (line & 1)
				dstv += (stride >> 1);
			else
				dstu += (stride >> 1);
		}

		return 0;
	}

	/*
	 * Compressed;
	 * the decompressor routines will write the data in planar format
	 * immediately.
	 */
	if (pdev->vsize == PSZ_VGA && pdev->vframes == 5 && pdev->vsnapshot) {
		PWC_ERROR("Mode Bayer is not supported for now\n");
		/* flags |= PWCX_FLAG_BAYER; */
		return -ENXIO; /* No such device or address: missing decompressor */
	}

	if (DEVICE_USE_CODEC1(pdev->type)) {

		/* TODO & FIXME */
		PWC_ERROR("This chipset is not supported for now\n");
		return -ENXIO; /* No such device or address: missing decompressor */

	} else {
		pwc_dec23_decompress(pdev, yuv, image, PWCX_FLAG_PLANAR);
	}
	return 0;
}


/* vim: set cino= formatoptions=croql cindent shiftwidth=8 tabstop=8: */
Commit	Line	Data
1da177e4 LT	1	/* Linux driver for Philips webcam
	2	Decompression frontend.
	3	(C) 1999-2003 Nemosoft Unv.
2b455db6	4	(C) 2004-2006 Luc Saillard (luc@saillard.org)
1da177e4 LT	5
	6	NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
	7	driver and thus may have bugs that are not present in the original version.
	8	Please send bug reports and support requests to <luc@saillard.org>.
	9	The decompression routines have been implemented by reverse-engineering the
	10	Nemosoft binary pwcx module. Caveat emptor.
	11
	12	This program is free software; you can redistribute it and/or modify
	13	it under the terms of the GNU General Public License as published by
	14	the Free Software Foundation; either version 2 of the License, or
	15	(at your option) any later version.
	16
	17	This program is distributed in the hope that it will be useful,
	18	but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	GNU General Public License for more details.
	21
	22	You should have received a copy of the GNU General Public License
	23	along with this program; if not, write to the Free Software
	24	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
2b455db6 LS	25
2b455db6 LS	26	vim: set ts=8:
1da177e4 LT	27	*/
	28
	29	#include <asm/current.h>
	30	#include <asm/types.h>
	31
	32	#include "pwc.h"
	33	#include "pwc-uncompress.h"
2b455db6 LS	34	#include "pwc-dec1.h"
2b455db6 LS	35	#include "pwc-dec23.h"
1da177e4 LT	36
	37	int pwc_decompress(struct pwc_device *pdev)
	38	{
	39	struct pwc_frame_buf *fbuf;
	40	int n, line, col, stride;
	41	void yuv, image;
	42	u16 *src;
	43	u16 dsty, dstu, *dstv;
	44
	45	if (pdev == NULL)
	46	return -EFAULT;
1da177e4 LT	47
	48	fbuf = pdev->read_frame;
	49	if (fbuf == NULL)
	50	return -EFAULT;
2b455db6 LS	51	image = pdev->image_data;
2b455db6 LS	52	image += pdev->images[pdev->fill_image].offset;
1da177e4 LT	53
	54	yuv = fbuf->data + pdev->frame_header_size; /* Skip header */
	55
	56	/* Raw format; that's easy... */
479567ce	57	if (pdev->pixfmt != V4L2_PIX_FMT_YUV420)
1da177e4	58	{
2b455db6 LS	59	struct pwc_raw_frame *raw_frame = image;
	60	raw_frame->type = cpu_to_le16(pdev->type);
	61	raw_frame->vbandlength = cpu_to_le16(pdev->vbandlength);
	62	/* cmd_buf is always 4 bytes, but sometimes, only the
	63	* first 3 bytes is filled (Nala case). We can
	64	* determine this using the type of the webcam */
	65	memcpy(raw_frame->cmd, pdev->cmd_buf, 4);
	66	memcpy(raw_frame+1, yuv, pdev->frame_size);
1da177e4 LT	67	return 0;
	68	}
	69
	70	if (pdev->vbandlength == 0) {
2b455db6 LS	71	/* Uncompressed mode.
	72	* We copy the data into the output buffer, using the viewport
	73	* size (which may be larger than the image size).
	74	* Unfortunately we have to do a bit of byte stuffing to get
	75	* the desired output format/size.
	76	*
	77	* We do some byte shuffling here to go from the
	78	* native format to YUV420P.
1da177e4	79	*/
2b455db6 LS	80	src = (u16 *)yuv;
	81	n = pdev->view.x * pdev->view.y;
	82
	83	/* offset in Y plane */
	84	stride = pdev->view.x * pdev->offset.y + pdev->offset.x;
	85	dsty = (u16 *)(image + stride);
	86
	87	/* offsets in U/V planes */
	88	stride = pdev->view.x * pdev->offset.y / 4 + pdev->offset.x / 2;
	89	dstu = (u16 *)(image + n + stride);
	90	dstv = (u16 *)(image + n + n / 4 + stride);
	91
	92	/* increment after each line */
	93	stride = (pdev->view.x - pdev->image.x) / 2; /* u16 is 2 bytes */
	94
	95	for (line = 0; line < pdev->image.y; line++) {
	96	for (col = 0; col < pdev->image.x; col += 4) {
	97	dsty++ = src++;
	98	dsty++ = src++;
1da177e4	99	if (line & 1)
2b455db6	100	dstv++ = src++;
1da177e4	101	else
2b455db6	102	dstu++ = src++;
1da177e4	103	}
2b455db6 LS	104	dsty += stride;
	105	if (line & 1)
	106	dstv += (stride >> 1);
	107	else
	108	dstu += (stride >> 1);
	109	}
	110
	111	return 0;
1da177e4	112	}
2b455db6 LS	113
	114	/*
	115	* Compressed;
	116	* the decompressor routines will write the data in planar format
	117	* immediately.
	118	*/
	119	if (pdev->vsize == PSZ_VGA && pdev->vframes == 5 && pdev->vsnapshot) {
	120	PWC_ERROR("Mode Bayer is not supported for now\n");
	121	/* flags \|= PWCX_FLAG_BAYER; */
	122	return -ENXIO; /* No such device or address: missing decompressor */
	123	}
	124
	125	if (DEVICE_USE_CODEC1(pdev->type)) {
	126
	127	/* TODO & FIXME */
	128	PWC_ERROR("This chipset is not supported for now\n");
	129	return -ENXIO; /* No such device or address: missing decompressor */
	130
	131	} else {
	132	pwc_dec23_decompress(pdev, yuv, image, PWCX_FLAG_PLANAR);
1da177e4 LT	133	}
	134	return 0;
	135	}
	136
	137
2b455db6	138	/* vim: set cino= formatoptions=croql cindent shiftwidth=8 tabstop=8: */