DVP Capture

[中文]

1 Overview

The main function of taking pictures is to store a frame of raw data collected by the dvp/uvc sensor on the SDCard after being compressed and encoded by the jpeg encode module.

2 Code Path

demo path:./components/demos/media/video/capture/capture.c

3 Client command

The commands support by demo

Command	Param	Description
dvp init param1 param2 param3	param1:camera_type	the type of using dvp
	param2:image resolution	the resolution output
	param3:frame rate	the frame rate output
dvp capture param1	param1:file_id	the head neme of imag
dvp deinit	无	deinit dvp function

The macro configuration that the demo runs depends on:

NAME	Description	File	value
CONFIG_JPEG_ENCODE	support hw jpeg encode	middleware\soc\bk7256\bk7256.defconfig	y
CONFIG_CAMERA	suport use dvp camera	middleware\soc\bk7256\bk7256.defconfig	y
CONFIG_USE_APP_DEMO_VIDEO_TRANSSER	support video transfer	middleware\soc\bk7256\bk7256.defconfig	y
CONFIG_NET_WORK_VIDEO_TRANSFER	support wifi transfer	middleware\soc\bk7256\bk7256.defconfig	y
CONFIG_COMPONENTS_P2P	support p2p transfer	middleware\soc\bk7256\bk7256.defconfig	n
CONFIG_CAMERA_USE_I2C1	suport use I2C1	middleware\soc\bk7256\bk7256.defconfig	y

4 Demo introduction

The steps performed by the demo are as follows:

1. Prepare the dvp camera, the connection method is as shown below:

2. Send the following commands in sequence

   fatfstest M 1

   dvp capture：dvp init 或 dvp init 0 640X480 20

   uvc capture：dvp init 4 640X480 20

   dvp capture 1(file_id)

   dvp deinit

Figure 1. sensor connection

5 Detailed configuration and its description

1.set dvp parameters: dvp init param1 param2 param3

param1:0-5, set sensor type and output date type，reference: media_camera_type_t.

typedef enum {
        MEDIA_DVP_MJPEG,         /**< dvp camera and output jpeg data */
        MEDIA_DVP_H264,          /**< dvp camera and output h264 data */
        MEDIA_DVP_YUV,           /**< dvp camera and output yuv data */
        MEDIA_DVP_MIX,           /**< dvp camera and output jpeg/yuv by turns */
        MEDIA_UVC_MJPEG,         /**< uvc camera and output jpeg data */
        MEDIA_UVC_H264,          /**< uvc camera and output h264 data */
        MEDIA_CAMERA_UNKNOW,     /**< camera not support */
} media_camera_type_t;

param2:resolution，sensor output ppi，reference: ``media_ppi_t``.

        GC0328C: 640X480, 480X272, 480X320

        HM_1055: 1280X720

        GC2145: 1280X720, 800X600, 640X480

param3:frame_rate，sensor output frame_rate，reference: ``sensor_fps_t``

        GC0328C：5、10、20、25

        HM_1055：5、10、15、20

        GC2145: 10、15、20、25

2.capture command: dvp save_image file_id

        file_id: range(0-255)

Note

Note: The above camera command supports continuous photography, but the file_id needs to be changed every time, and the id of each image cannot be the same.