samples: drivers: video: improve the video capture sample

Set proper value for some resources. Use configurable fps.

Signed-off-by: Aiden Hu <[email protected]>

Author: AidenHu

samples/drivers/video/capture/boards/rd_rw612_bga.conf

@@ -3,13 +3,13 @@ CONFIG_USB_HOST_STACK=y
 CONFIG_USBH_VIDEO_CLASS=y
 
 # Video buffer configuration
-CONFIG_VIDEO_BUFFER_POOL_SZ_MAX=154000
-CONFIG_VIDEO_BUFFER_POOL_NUM_MAX=2
+CONFIG_VIDEO_BUFFER_POOL_SZ_MAX=116000
+CONFIG_VIDEO_BUFFER_POOL_NUM_MAX=6
 CONFIG_VIDEO_BUFFER_POOL_ALIGN=32
 
 
 # Memory configuration for USB transfers
-CONFIG_HEAP_MEM_POOL_SIZE=70000
-CONFIG_MAIN_STACK_SIZE=80960
+CONFIG_HEAP_MEM_POOL_SIZE=40960
+CONFIG_MAIN_STACK_SIZE=10240
 CONFIG_USBH_USB_DEVICE_HEAP=8912
-CONFIG_UHC_BUF_POOL_SIZE=4096
+CONFIG_UHC_BUF_POOL_SIZE=4096

samples/drivers/video/capture/prj.conf

@@ -11,4 +11,6 @@ CONFIG_REQUIRES_FLOAT_PRINTF=y
 CONFIG_DEBUG_OPTIMIZATIONS=y
 CONFIG_USBH_VIDEO_LOG_LEVEL_WRN=y
 CONFIG_VIDEO_FRAME_WIDTH=320
-CONFIG_VIDEO_FRAME_HEIGHT=240
+CONFIG_VIDEO_FRAME_HEIGHT=180
+CONFIG_VIDEO_TARGET_FPS=15
+CONFIG_USBH_VIDEO_MULTIPLE_PRIME_COUNT=8

samples/drivers/video/capture/src/main.c

@@ -399,6 +399,18 @@ int main(void)
 					fie.index++;
 				}
 
+#if CONFIG_VIDEO_TARGET_FPS > 0
+				frmival.denominator = CONFIG_VIDEO_TARGET_FPS;
+				frmival.numerator = 1;
+				if (!video_set_frmival(uvc_host, &frmival)) {
+					/* Get the actual frame rate that was set */
+					if (!video_get_frmival(uvc_host, &frmival)) {
+						LOG_INF("- Target frame rate set to: %f fps",
+							1.0 * frmival.denominator / frmival.numerator);
+					}
+				}
+#endif
+
 				/* Get supported controls */
 				LOG_INF("- Supported controls:");
 				const struct device *last_dev = NULL;
@@ -456,7 +468,6 @@ int main(void)
 					break;
 				}
 
-				/* TODO: CONFIG_VIDEO_BUFFER_POOL_NUM_MAX is 1 now, consider to use multiple video buffers */
 				for (i = 0; i < CONFIG_VIDEO_BUFFER_POOL_NUM_MAX; i++) {
 					/*
 					 * For some hardwares, such as the PxP used on i.MX RT1170 to do image rotation,