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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Linux driver for Philips webcam
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Decompression frontend.
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(C) 1999-2003 Nemosoft Unv.
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(C) 2004-2006 Luc Saillard (luc@saillard.org)
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NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
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driver and thus may have bugs that are not present in the original version.
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Please send bug reports and support requests to <luc@saillard.org>.
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The decompression routines have been implemented by reverse-engineering the
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Nemosoft binary pwcx module. Caveat emptor.
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vim: set ts=8:
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*/
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#include <asm/current.h>
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#include <asm/types.h>
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#include "pwc.h"
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#include "pwc-dec1.h"
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#include "pwc-dec23.h"
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int pwc_decompress(struct pwc_device *pdev, struct pwc_frame_buf *fbuf)
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{
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int n, line, col;
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void *yuv, *image;
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u16 *src;
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u16 *dsty, *dstu, *dstv;
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image = vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0);
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yuv = fbuf->data + pdev->frame_header_size; /* Skip header */
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/* Raw format; that's easy... */
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if (pdev->pixfmt != V4L2_PIX_FMT_YUV420)
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{
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struct pwc_raw_frame *raw_frame = image;
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raw_frame->type = cpu_to_le16(pdev->type);
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raw_frame->vbandlength = cpu_to_le16(pdev->vbandlength);
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/* cmd_buf is always 4 bytes, but sometimes, only the
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* first 3 bytes is filled (Nala case). We can
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* determine this using the type of the webcam */
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memcpy(raw_frame->cmd, pdev->cmd_buf, 4);
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memcpy(raw_frame+1, yuv, pdev->frame_size);
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vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0,
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pdev->frame_size + sizeof(struct pwc_raw_frame));
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return 0;
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}
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vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0,
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pdev->width * pdev->height * 3 / 2);
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if (pdev->vbandlength == 0) {
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/* Uncompressed mode.
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*
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* We do some byte shuffling here to go from the
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* native format to YUV420P.
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*/
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src = (u16 *)yuv;
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n = pdev->width * pdev->height;
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dsty = (u16 *)(image);
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dstu = (u16 *)(image + n);
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dstv = (u16 *)(image + n + n / 4);
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for (line = 0; line < pdev->height; line++) {
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for (col = 0; col < pdev->width; col += 4) {
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*dsty++ = *src++;
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*dsty++ = *src++;
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if (line & 1)
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*dstv++ = *src++;
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else
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*dstu++ = *src++;
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}
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}
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return 0;
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}
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/*
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* Compressed;
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* the decompressor routines will write the data in planar format
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* immediately.
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*/
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if (DEVICE_USE_CODEC1(pdev->type)) {
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/* TODO & FIXME */
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PWC_ERROR("This chipset is not supported for now\n");
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return -ENXIO; /* No such device or address: missing decompressor */
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} else {
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pwc_dec23_decompress(pdev, yuv, image);
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}
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return 0;
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}
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