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95 lines
2.5 KiB
95 lines
2.5 KiB
// 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 ([email protected]) |
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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 <[email protected]>. |
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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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