1 files changed, 133 insertions, 0 deletions

diff --git a/drivers/media/video/pwc/pwc-uncompress.c b/drivers/media/video/pwc/pwc-uncompress.c
new file mode 100644
index 00000000000..51265092bd3
--- /dev/null
+++ b/drivers/media/video/pwc/pwc-uncompress.c
@@ -0,0 +1,133 @@
+/* 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-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;
+
+        image = vb2_plane_vaddr(&fbuf->vb, 0);
+
+        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);
+                vb2_set_plane_payload(&fbuf->vb, 0,
+                        pdev->frame_size + sizeof(struct pwc_raw_frame));
+                return 0;
+        }
+
+        vb2_set_plane_payload(&fbuf->vb, 0, pdev->view.size);
+
+        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: */