Add libusb and libuvc

[rtmpclient.git] / app / src / main / jni / libuvc-0.0.6 / src / example.c

diff --git a/app/src/main/jni/libuvc-0.0.6/src/example.c b/app/src/main/jni/libuvc-0.0.6/src/example.c
new file mode 100644 (file)
index 0000000..8178cbf
--- /dev/null
+++ b/app/src/main/jni/libuvc-0.0.6/src/example.c
@@ -0,0 +1,148 @@
+#include "libuvc/libuvc.h"
+#include <stdio.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) {
+  uvc_frame_t *bgr;
+  uvc_error_t ret;
+
+  /* We'll convert the image from YUV/JPEG to BGR, so allocate space */
+  bgr = uvc_allocate_frame(frame->width * frame->height * 3);
+  if (!bgr) {
+    printf("unable to allocate bgr frame!");
+    return;
+  }
+
+  /* Do the BGR conversion */
+  ret = uvc_any2bgr(frame, bgr);
+  if (ret) {
+    uvc_perror(ret, "uvc_any2bgr");
+    uvc_free_frame(bgr);
+    return;
+  }
+
+  /* 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);
+   */
+
+  /* Use opencv.highgui to display the image:
+   * 
+   * cvImg = cvCreateImageHeader(
+   *     cvSize(bgr->width, bgr->height),
+   *     IPL_DEPTH_8U,
+   *     3);
+   *
+   * cvSetData(cvImg, bgr->data, bgr->width * 3); 
+   *
+   * cvNamedWindow("Test", CV_WINDOW_AUTOSIZE);
+   * cvShowImage("Test", cvImg);
+   * cvWaitKey(10);
+   *
+   * cvReleaseImageHeader(&cvImg);
+   */
+
+  uvc_free_frame(bgr);
+}
+
+int main(int argc, char **argv) {
+  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_YUYV, /* YUV 422, aka YUV 4:2:2. try _COMPRESSED */
+          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*) 12345)
+         */
+        res = uvc_start_streaming(devh, &ctrl, cb, 12345, 0);
+
+        if (res < 0) {
+          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);
+          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;
+}
+