// 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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