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stream-disk.c
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stream-disk.c
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/* Software License Agreement (BSD License)
*
* Copyright (C) 2010-2015 Ken Tossell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the author nor other contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <libuvc/libuvc.h>
#include <stdio.h>
#include <unistd.h>
/* This callback function runs once per frame. Use it to perform any
* quick processing you need, or have it put the frame into your application's
* input queue. If this function takes too long, you'll start losing frames. */
void cb(uvc_frame_t *frame, void *ptr)
{
FILE *file = ((FILE *)ptr);
uvc_error_t ret;
/* Call a user function:
*
* my_type *my_obj = (*my_type) ptr;
* my_user_function(ptr, bgr);
* my_other_function(ptr, bgr->data, bgr->width, bgr->height);
*/
/* Call a C++ method:
*
* my_type *my_obj = (*my_type) ptr;
* my_obj->my_func(bgr);
*/
/* Write each frame to disk: */
fwrite(frame->data, 1, frame->data_bytes, file);
}
int main(int argc, char **argv)
{
const char *filename = "stream-disk.mjpeg";
uvc_context_t *ctx;
uvc_device_t *dev;
uvc_device_handle_t *devh;
uvc_stream_ctrl_t ctrl;
uvc_error_t res;
/* Initialize a UVC service context. Libuvc will set up its own libusb
* context. Replace NULL with a libusb_context pointer to run libuvc
* from an existing libusb context. */
res = uvc_init(&ctx, NULL);
if (res < 0)
{
uvc_perror(res, "uvc_init");
return res;
}
puts("UVC initialized");
/* Locates the first attached UVC device, stores in dev */
res = uvc_find_device(
ctx, &dev,
0, 0, NULL); /* filter devices: vendor_id, product_id, "serial_num" */
if (res < 0)
{
uvc_perror(res, "uvc_find_device"); /* no devices found */
}
else
{
puts("Device found");
/* Try to open the device: requires exclusive access */
res = uvc_open(dev, &devh);
if (res < 0)
{
uvc_perror(res, "uvc_open"); /* unable to open device */
}
else
{
puts("Device opened");
/* Print out a message containing all the information that libuvc
* knows about the device */
uvc_print_diag(devh, stderr);
/* Try to negotiate a 640x480 30 fps YUYV stream profile */
res = uvc_get_stream_ctrl_format_size(
devh, &ctrl, /* result stored in ctrl */
UVC_FRAME_FORMAT_MJPEG, /* MJPEG for writing to disk */
640, 480, 30 /* width, height, fps */
);
/* Print out the result */
uvc_print_stream_ctrl(&ctrl, stderr);
if (res < 0)
{
uvc_perror(res, "get_mode"); /* device doesn't provide a matching stream */
}
else
{
/* Start the video stream. The library will call user function cb:
* cb(frame, (void*) user_ptr)
*/
FILE *file = fopen(filename, "wb");
void *user_ptr = file;
res = uvc_start_streaming(devh, &ctrl, cb, user_ptr, 0);
if (res < 0)
{
fclose(file);
uvc_perror(res, "start_streaming"); /* unable to start stream */
}
else
{
puts("Streaming...");
uvc_set_ae_mode(devh, 1); /* e.g., turn on auto exposure */
sleep(10); /* stream for 10 seconds */
/* End the stream. Blocks until last callback is serviced */
uvc_stop_streaming(devh);
fclose(file);
puts("Done streaming.");
}
}
/* Release our handle on the device */
uvc_close(devh);
puts("Device closed");
}
/* Release the device descriptor */
uvc_unref_device(dev);
}
/* Close the UVC context. This closes and cleans up any existing device handles,
* and it closes the libusb context if one was not provided. */
uvc_exit(ctx);
puts("UVC exited");
return 0;
}