v4l2uvc.c

linux下摄像头采集的图像格式转换工具

/*******************************************************************************
#	 	uvcview: Sdl video Usb Video Class grabber           .         #
#This package work with the Logitech UVC based webcams with the mjpeg feature. #
#All the decoding is in user space with the embedded jpeg decoder              #
#.                                                                             #
# 		Copyright (C) 2005 2006 Laurent Pinchart &&  Michel Xhaard     #
#                                                                              #
# 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    #
#                                                                              #
*******************************************************************************/

#include "v4l2uvc.h"
#include "utils.h"

static int debug = 0;

static unsigned char dht_data[DHT_SIZE] = {
    0xff, 0xc4, 0x00, 0x1f, 0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01,
    0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
    0x0b, 0xff, 0xc4, 0x00, 0xb5, 0x10, 0x00, 0x02,
    0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00,
    0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04, 0x11,
    0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71,
    0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23, 0x42,
    0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, 0x09,
    0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26,
    0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43,
    0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53,
    0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67,
    0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77,
    0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92,
    0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a,
    0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
    0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
    0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6,
    0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3, 0xe4,
    0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6,
    0xf7, 0xf8, 0xf9, 0xfa, 0xff, 0xc4, 0x00, 0x1f,
    0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02,
    0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0xff, 0xc4, 0x00,
    0xb5, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04, 0x04,
    0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01,
    0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06,
    0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08, 0x14,
    0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33,
    0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25,
    0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28,
    0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46,
    0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56,
    0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
    0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
    0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94,
    0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3,
    0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
    0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
    0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
    0xd9, 0xda, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
    0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa
};

static int init_v4l2(struct vdIn *vd);

int
init_videoIn(struct vdIn *vd, char *device, int width, int height,
	     int format, int grabmethod)
{
    int ret = -1;
    int i;
    if (vd == NULL || device == NULL)
	return -1;
    if (width == 0 || height == 0)
	return -1;
    if (grabmethod < 0 || grabmethod > 1)
	grabmethod = 1;		//mmap by default;
    vd->videodevice = NULL;
    vd->status = NULL;
    vd->pictName = NULL;
    vd->videodevice = (char *) calloc(1, 16 * sizeof(char));
    vd->status = (char *) calloc(1, 100 * sizeof(char));
    vd->pictName = (char *) calloc(1, 80 * sizeof(char));
    snprintf(vd->videodevice, 12, "%s", device);
    printf("video %s \n", vd->videodevice);
    vd->toggleAvi = 0;
    vd->getPict = 0;
    vd->signalquit = 1;
    vd->width = width;
    vd->height = height;
    vd->formatIn = format;
    vd->grabmethod = grabmethod;
    if (init_v4l2(vd) < 0) {
	printf(" Init v4L2 failed !! exit fatal \n");
	goto error;;
    }
    /* alloc a temp buffer to reconstruct the pict */
    vd->framesizeIn = (vd->width * vd->height << 1);
    switch (vd->formatIn) {
    case V4L2_PIX_FMT_MJPEG:
	vd->tmpbuffer =
	    (unsigned char *) calloc(1, (size_t) vd->framesizeIn);
	if (!vd->tmpbuffer)
	    goto error;
	vd->framebuffer =
	    (unsigned char *) calloc(1,
				     (size_t) vd->width * (vd->height +
							   8) * 2);
	break;
    case V4L2_PIX_FMT_YUYV:
	vd->framebuffer =
	    (unsigned char *) calloc(1, (size_t) vd->framesizeIn);
	break;
    default:
	printf(" should never arrive exit fatal !!\n");
	goto error;
	break;
    }
    if (!vd->framebuffer)
	goto error;
    return 0;
  error:
    free(vd->videodevice);
    free(vd->status);
    free(vd->pictName);
    close(vd->fd);
    return -1;
}

static int init_v4l2(struct vdIn *vd)
{
    int i;
    int ret = 0;

    if ((vd->fd = open(vd->videodevice, O_RDWR)) == -1) {
	perror("ERROR opening V4L interface \n");
	exit(1);
    }
    memset(&vd->cap, 0, sizeof(struct v4l2_capability));
    ret = ioctl(vd->fd, VIDIOC_QUERYCAP, &vd->cap);
    if (ret < 0) {
	printf("Error opening device %s: unable to query device.\n",
	       vd->videodevice);
	goto fatal;
    }

    if ((vd->cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
	printf("Error opening device %s: video capture not supported.\n",
	       vd->videodevice);
	goto fatal;;
    }
    if (vd->grabmethod) {
	if (!(vd->cap.capabilities & V4L2_CAP_STREAMING)) {
	    printf("%s does not support streaming i/o\n", vd->videodevice);
	    goto fatal;
	}
    } else {
	if (!(vd->cap.capabilities & V4L2_CAP_READWRITE)) {
	    printf("%s does not support read i/o\n", vd->videodevice);
	    goto fatal;
	}
    }
    /* set format in */
    memset(&vd->fmt, 0, sizeof(struct v4l2_format));
    vd->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    vd->fmt.fmt.pix.width = vd->width;
    vd->fmt.fmt.pix.height = vd->height;
    vd->fmt.fmt.pix.pixelformat = vd->formatIn;
    vd->fmt.fmt.pix.field = V4L2_FIELD_ANY;
    ret = ioctl(vd->fd, VIDIOC_S_FMT, &vd->fmt);
    if (ret < 0) {
	printf("Unable to set format: %d.\n", errno);
	goto fatal;
    }
    if ((vd->fmt.fmt.pix.width != vd->width) ||
	(vd->fmt.fmt.pix.height != vd->height)) {
	printf(" format asked unavailable get width %d height %d \n",
	       vd->fmt.fmt.pix.width, vd->fmt.fmt.pix.height);
	vd->width = vd->fmt.fmt.pix.width;
	vd->height = vd->fmt.fmt.pix.height;
	/* look the format is not part of the deal ??? */
	//vd->formatIn = vd->fmt.fmt.pix.pixelformat;
    }
    /* request buffers */
    memset(&vd->rb, 0, sizeof(struct v4l2_requestbuffers));
    vd->rb.count = NB_BUFFER;
    vd->rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    vd->rb.memory = V4L2_MEMORY_MMAP;

    ret = ioctl(vd->fd, VIDIOC_REQBUFS, &vd->rb);
    if (ret < 0) {
	printf("Unable to allocate buffers: %d.\n", errno);
	goto fatal;
    }
    /* map the buffers */
    for (i = 0; i < NB_BUFFER; i++) {
	memset(&vd->buf, 0, sizeof(struct v4l2_buffer));
	vd->buf.index = i;
	vd->buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	vd->buf.memory = V4L2_MEMORY_MMAP;
	ret = ioctl(vd->fd, VIDIOC_QUERYBUF, &vd->buf);
	if (ret < 0) {
	    printf("Unable to query buffer (%d).\n", errno);
	    goto fatal;
	}
	if (debug)
	    printf("length: %u offset: %u\n", vd->buf.length,
		   vd->buf.m.offset);
	vd->mem[i] = mmap(0 /* start anywhere */ ,
			  vd->buf.length, PROT_READ, MAP_SHARED, vd->fd,
			  vd->buf.m.offset);
	if (vd->mem[i] == MAP_FAILED) {
	    printf("Unable to map buffer (%d)\n", errno);
	    goto fatal;
	}
	if (debug)
	    printf("Buffer mapped at address %p.\n", vd->mem[i]);
    }
    /* Queue the buffers. */
    for (i = 0; i < NB_BUFFER; ++i) {
	memset(&vd->buf, 0, sizeof(struct v4l2_buffer));
	vd->buf.index = i;
	vd->buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	vd->buf.memory = V4L2_MEMORY_MMAP;
	ret = ioctl(vd->fd, VIDIOC_QBUF, &vd->buf);
	if (ret < 0) {
	    printf("Unable to queue buffer (%d).\n", errno);
	    goto fatal;;
	}
    }
    return 0;
  fatal:
    return -1;

}

static int video_enable(struct vdIn *vd)
{
    int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    int ret;

    ret = ioctl(vd->fd, VIDIOC_STREAMON, &type);
    if (ret < 0) {
	printf("Unable to %s capture: %d.\n", "start", errno);
	return ret;
    }
    vd->isstreaming = 1;
    return 0;
}

static int video_disable(struct vdIn *vd)
{
    int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    int ret;

    ret = ioctl(vd->fd, VIDIOC_STREAMOFF, &type);
    if (ret < 0) {
	printf("Unable to %s capture: %d.\n", "stop", errno);
	return ret;
    }
    vd->isstreaming = 0;
    return 0;
}

static int convertframe(struct vdIn *vd)
{
    int erreur = 0;
    switch (vd->formatIn) {
    case V4L2_PIX_FMT_MJPEG:
	if (jpeg_decode
	    (&vd->framebuffer, vd->tmpbuffer, &vd->width,
	     &vd->height) < 0) {
	    printf("jpeg decode errors\n");
	    goto err;
	}
	break;
    case V4L2_PIX_FMT_YUYV:
	// convert to output format
	break;