diff options
Diffstat (limited to 'drivers/media/video/uvc/uvc_isight.c')
| -rw-r--r-- | drivers/media/video/uvc/uvc_isight.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/drivers/media/video/uvc/uvc_isight.c b/drivers/media/video/uvc/uvc_isight.c deleted file mode 100644 index 8510e7259e76..000000000000 --- a/drivers/media/video/uvc/uvc_isight.c +++ /dev/null @@ -1,137 +0,0 @@ -/* - * uvc_isight.c -- USB Video Class driver - iSight support - * - * Copyright (C) 2006-2007 - * Ivan N. Zlatev <contact@i-nz.net> - * Copyright (C) 2008-2009 - * Laurent Pinchart <laurent.pinchart@ideasonboard.com> - * - * 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. - * - */ - -#include <linux/usb.h> -#include <linux/kernel.h> -#include <linux/mm.h> - -#include "uvcvideo.h" - -/* Built-in iSight webcams implements most of UVC 1.0 except a - * different packet format. Instead of sending a header at the - * beginning of each isochronous transfer payload, the webcam sends a - * single header per image (on its own in a packet), followed by - * packets containing data only. - * - * Offset Size (bytes) Description - * ------------------------------------------------------------------ - * 0x00 1 Header length - * 0x01 1 Flags (UVC-compliant) - * 0x02 4 Always equal to '11223344' - * 0x06 8 Always equal to 'deadbeefdeadface' - * 0x0e 16 Unknown - * - * The header can be prefixed by an optional, unknown-purpose byte. - */ - -static int isight_decode(struct uvc_video_queue *queue, struct uvc_buffer *buf, - const __u8 *data, unsigned int len) -{ - static const __u8 hdr[] = { - 0x11, 0x22, 0x33, 0x44, - 0xde, 0xad, 0xbe, 0xef, - 0xde, 0xad, 0xfa, 0xce - }; - - unsigned int maxlen, nbytes; - __u8 *mem; - int is_header = 0; - - if (buf == NULL) - return 0; - - if ((len >= 14 && memcmp(&data[2], hdr, 12) == 0) || - (len >= 15 && memcmp(&data[3], hdr, 12) == 0)) { - uvc_trace(UVC_TRACE_FRAME, "iSight header found\n"); - is_header = 1; - } - - /* Synchronize to the input stream by waiting for a header packet. */ - if (buf->state != UVC_BUF_STATE_ACTIVE) { - if (!is_header) { - uvc_trace(UVC_TRACE_FRAME, "Dropping packet (out of " - "sync).\n"); - return 0; - } - - buf->state = UVC_BUF_STATE_ACTIVE; - } - - /* Mark the buffer as done if we're at the beginning of a new frame. - * - * Empty buffers (bytesused == 0) don't trigger end of frame detection - * as it doesn't make sense to return an empty buffer. - */ - if (is_header && buf->bytesused != 0) { - buf->state = UVC_BUF_STATE_DONE; - return -EAGAIN; - } - - /* Copy the video data to the buffer. Skip header packets, as they - * contain no data. - */ - if (!is_header) { - maxlen = buf->length - buf->bytesused; - mem = buf->mem + buf->bytesused; - nbytes = min(len, maxlen); - memcpy(mem, data, nbytes); - buf->bytesused += nbytes; - - if (len > maxlen || buf->bytesused == buf->length) { - uvc_trace(UVC_TRACE_FRAME, "Frame complete " - "(overflow).\n"); - buf->state = UVC_BUF_STATE_DONE; - } - } - - return 0; -} - -void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream, - struct uvc_buffer *buf) -{ - int ret, i; - - for (i = 0; i < urb->number_of_packets; ++i) { - if (urb->iso_frame_desc[i].status < 0) { - uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame " - "lost (%d).\n", - urb->iso_frame_desc[i].status); - } - - /* Decode the payload packet. - * uvc_video_decode is entered twice when a frame transition - * has been detected because the end of frame can only be - * reliably detected when the first packet of the new frame - * is processed. The first pass detects the transition and - * closes the previous frame's buffer, the second pass - * processes the data of the first payload of the new frame. - */ - do { - ret = isight_decode(&stream->queue, buf, - urb->transfer_buffer + - urb->iso_frame_desc[i].offset, - urb->iso_frame_desc[i].actual_length); - - if (buf == NULL) - break; - - if (buf->state == UVC_BUF_STATE_DONE || - buf->state == UVC_BUF_STATE_ERROR) - buf = uvc_queue_next_buffer(&stream->queue, - buf); - } while (ret == -EAGAIN); - } -} |
