first commit

2024-12-15 20:42:32 +08:00
commit 986b2fca12
586 changed files with 154149 additions and 0 deletions
--- a/GB28181Device/media/v4l2.cpp
+++ b/GB28181Device/media/v4l2.cpp
@@ -0,0 +1,127 @@
+/***************************************************************************************
+ *
+ *  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+ *
+ *  By downloading, copying, installing or using the software you agree to this license.
+ *  If you do not agree to this license, do not download, install, 
+ *  copy or use the software.
+ *
+ *  Copyright (C) 2014-2022, Happytimesoft Corporation, all rights reserved.
+ *
+ *  Redistribution and use in binary forms, with or without modification, are permitted.
+ *
+ *  Unless required by applicable law or agreed to in writing, software distributed 
+ *  under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ *  CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
+ *  language governing permissions and limitations under the License.
+ *
+****************************************************************************************/
+
+#include "sys_inc.h"
+#include "v4l2.h"
+#include <linux/videodev2.h>
+
+
+int v4l2_open_device(const char * filename)
+{ 
+    int fd;
+    int flags = O_RDWR;
+    struct v4l2_format fmt;
+    struct v4l2_capability cap;
+
+    fd = open(filename, flags, 0);
+    if (fd < 0) 
+    {
+        log_print(HT_LOG_ERR, "%s, open device(%s) failed. %s\r\n", 
+            __FUNCTION__, filename, strerror(errno));
+        return -1;
+    }
+
+    if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) 
+    {
+        log_print(HT_LOG_ERR, "%s, %s, ioctl(VIDIOC_QUERYCAP) failed. %s\r\n", 
+            __FUNCTION__, filename, strerror(errno));
+        goto fail;
+    }
+
+    if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) 
+    {
+        log_print(HT_LOG_ERR, "%s, %s, Not a video capture device.\r\n", 
+            __FUNCTION__, filename);
+        goto fail;
+    }
+
+    if (!(cap.capabilities & V4L2_CAP_STREAMING)) 
+    {
+        log_print(HT_LOG_ERR, "%s, %s, The device does not support the streaming I/O method.\r\n", 
+            __FUNCTION__, filename);
+        goto fail;
+    }
+
+    fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    
+    if (ioctl(fd, VIDIOC_G_FMT, &fmt) < 0) 
+    {
+        log_print(HT_LOG_ERR, "%s, %s, ioctl(VIDIOC_G_FMT) failed\r\n",
+            __FUNCTION__, filename);
+        goto fail;
+    }
+
+    return fd;
+
+fail:
+    close(fd);
+    return -1;
+}
+
+
+int v4l2_init_device(int fd, int *width, int *height, uint32 *pixelformat)
+{
+    struct v4l2_format fmt;
+
+	fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    fmt.fmt.pix.width = *width;
+    fmt.fmt.pix.height = *height;
+    fmt.fmt.pix.pixelformat = *pixelformat;
+    fmt.fmt.pix.field = V4L2_FIELD_ANY;
+
+    /* Some drivers will fail and return EINVAL when the pixelformat
+       is not supported (even if type field is valid and supported) */
+    if (ioctl(fd, VIDIOC_S_FMT, &fmt) < 0)
+    {
+    	log_print(HT_LOG_ERR, "ioctl(VIDIOC_S_FMT) failed\r\n");
+    	return -1;
+	}
+	
+    if ((*width != (int) fmt.fmt.pix.width) || (*height != (int) fmt.fmt.pix.height)) 
+    {
+    	log_print(HT_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", 
+    		*width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
+    		
+        *width = fmt.fmt.pix.width;
+        *height = fmt.fmt.pix.height;
+    }
+
+    if (*pixelformat != fmt.fmt.pix.pixelformat) 
+    {
+    	log_print(HT_LOG_DBG, "The V4L2 driver changed the pixel format from 0x%08X to 0x%08X\n",
+        	pixelformat, fmt.fmt.pix.pixelformat);
+        	
+        *pixelformat = fmt.fmt.pix.pixelformat;
+    }
+    else
+    {
+        log_print(HT_LOG_DBG, "%s, pixelformat = 0x%08X\r\n", __FUNCTION__, pixelformat);
+    }
+
+    if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) 
+    {
+    	log_print(HT_LOG_DBG, "The V4L2 driver is using the interlaced mode\n");
+    }
+
+    return 0;
+}
+
+
+
+