RK3568笔记十二：Zlmedia拉流显示测试

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Zlmediakit功能很强大，测试一下拉流，在通过解码显示。

一、环境

1、平台：rk3568

2、开发板:ATK-RK3568正点原子板子

3、环境：buildroot

测试的代码在GitHub - airockchip/rknpu2

main_video.cc主要功能是通过Zlmedia拉取RTSP流，并解码，然后重新编码保存成视频，所以直接在例子上修改程序，增加DRM显示。

二、编译

1、修改交叉工具链

修改build-linux_RK3566_RK3568.sh，

2、增加DRM显示程序

screen_test.cc

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <dlfcn.h>
#include <vector>
#include <string>#include "rga_func.h"
#include "rknn_api.h"#include "RgaUtils.h"
#include "im2d.h"
#include "opencv2/core/core.hpp"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/imgproc.hpp"
#include <opencv2/opencv.hpp>
#include "rga.h"
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "dev.h"
#include "bo.h"#include "screen_test.h"static sp_dev *mDev;
#define OUTPUT_DEVICE_LCD 1static drmModeConnectorPtr lcdConnectorPtr = nullptr;
static struct sp_crtc *lcdCRPtr;
static drmModeEncoderPtr lcdEncoderPtr = nullptr;
static uint32_t lcdCrtcId = 0;
static drmModeModeInfoPtr lcdModInfoPtr;// 内部使用的函数原型声明
static void get_connector(uint8_t outpuDevice);
static void get_encoder(uint8_t outpuDevice);
static void get_crtc(void);
static int init_screens();static void get_connector(uint8_t outpuDevice)
{int i, j = 0;int ret = 0;printf("mDev->num_connectors = %d\n", mDev->num_connectors);for (j = 0; j < mDev->num_connectors; j++){// name 是分辨率信息printf("connector name:%d\n", j);printf("connector_type:%d\n", j);printf("connector_type_id:%d\n", j);printf("connector status:%d\n", j);// 对应不同的输出设备, 指定不同的connector跟encoderif (outpuDevice == OUTPUT_DEVICE_LCD){if (mDev->connectors[j]->connector_type == DRM_MODE_CONNECTOR_DSI &&mDev->connectors[j]->connection == DRM_MODE_CONNECTED){lcdConnectorPtr = mDev->connectors[j];}}}
}static void get_encoder(uint8_t outpuDevice)
{int i;for (i = 0; i < mDev->num_encoders; i++){if (outpuDevice == OUTPUT_DEVICE_LCD){if (mDev->encoders[i]->encoder_type == DRM_MODE_ENCODER_DSI){lcdEncoderPtr = mDev->encoders[i];lcdCrtcId = lcdEncoderPtr->crtc_id;}}}
}static void get_crtc(void)
{int j;printf("lcd crtc id:%d\n", lcdCrtcId);for (j = 0; j < mDev->num_crtcs; j++){printf("encoderPtr->crtc_id:%d\n", mDev->crtcs[j].crtc->crtc_id);printf("mode_valid:%d\n", mDev->crtcs[j].crtc->mode_valid);printf("mode_name:%s\n", mDev->crtcs[j].crtc->mode.name);if (mDev->crtcs[j].crtc->crtc_id == lcdCrtcId && mDev->crtcs[j].crtc->mode_valid){lcdCRPtr = &mDev->crtcs[j];}}
}static int init_screens()
{int ret = 0;// 获取lcd connectorget_connector(OUTPUT_DEVICE_LCD);if (!lcdConnectorPtr){printf("failed to get hdmi connector or encoder.\n");return -1;}printf("lcd connector id:%d\n", lcdConnectorPtr->connector_id);// 获取lcd encoderget_encoder(OUTPUT_DEVICE_LCD);if (!lcdEncoderPtr){printf("failed to get encoder.\n");return -2;}printf("lcd encoder id:%d\n", lcdEncoderPtr->encoder_id);// 获取一下显示分辨率之类lcdModInfoPtr = &lcdConnectorPtr->modes[0];// 把connector的encoder id赋值为encoder的idlcdConnectorPtr->encoder_id = lcdEncoderPtr->encoder_id;// 获取lcd crtcget_crtc();if (!lcdCRPtr){printf("failed to get crtc.\n");return -3;}if (lcdCRPtr->scanout){printf("crtc already in use\n");return -4;}printf("lcd crtc id:%d\n", lcdCRPtr->crtc->crtc_id);// allset// 获取bo, 只需要输入分辨率即可.lcdCRPtr->scanout = create_sp_bo(mDev, lcdModInfoPtr->hdisplay, lcdModInfoPtr->vdisplay, 24, 32, DRM_FORMAT_XRGB8888, 0);if (!lcdCRPtr->scanout){printf("failed to create new scanout bo\n");return -5;}printf("fill test color\n");fill_bo(lcdCRPtr->scanout, 0xff, 0xff, 0x0, 0x0);ret = drmModeSetCrtc(mDev->fd, lcdEncoderPtr->crtc_id, lcdCRPtr->scanout->fb_id, 0, 0, &lcdConnectorPtr->connector_id, 1, lcdModInfoPtr);if (ret){printf("failed to set crtc mode ret=%d\n", ret);return -6;}lcdCRPtr->crtc = drmModeGetCrtc(mDev->fd, lcdCRPtr->crtc->crtc_id);memcpy(&lcdCRPtr->crtc->mode, lcdModInfoPtr, sizeof(*lcdModInfoPtr));return 0;
}int drm_dis_init(void)
{int ret = 0;int i = 0;printf("create sp dev\n");// 创建显示设备mDev = create_sp_dev();if (!mDev){printf("failed to exec create_sp_dev.\n");return -10;}printf("init_screen\n");// 初始化屏幕ret = init_screens();if (ret != 0){printf("failed to exec initialize_screens.\n");return -11;}return 0;
}void draw_lcd_screen_rgb_960(uint8_t *data, uint32_t dataSize)
{uint32_t colIdx = 0;uint32_t rowIdx = 0;uint8_t *dataPtr = data;for (rowIdx = 0; rowIdx < 1280; rowIdx++){uint8_t *rowPtr = (uint8_t *)lcdCRPtr->scanout->map_addr + rowIdx * lcdCRPtr->scanout->pitch;for (colIdx = 0; colIdx < 720; colIdx++){uint8_t *pixel = rowPtr + colIdx * 4;   // bgr#if 1pixel[0] = *dataPtr;         dataPtr++;pixel[1] = *dataPtr;dataPtr++;pixel[2] = *dataPtr;dataPtr++;pixel[3] = 0xff;#else  // bgrapixel[0] = 0xff;   // BdataPtr++;pixel[1] = 0x00;   //G dataPtr++;pixel[2] = 0x00;   //RdataPtr++;pixel[3] = 0xFF;#endif}}
}void draw_lcd_screen_rgb_dynamic(uint8_t *data, uint32_t dataSize, uint8_t screenNum, uint8_t rows, uint8_t cols)
{if (rows == 0 || cols == 0 || screenNum >= rows * cols){return; // 避免除零错误和数组越界}uint32_t startRowIdx, startColIdx;uint32_t screenWidth = LCD_SCREEN_WIDTH / cols;uint32_t screenHeight = LCD_SCREEN_HEIGHT / rows;// 计算起始行和列索引startRowIdx = (screenNum / cols) * screenHeight; // 根据屏幕编号计算起始行索引startColIdx = (screenNum % cols) * screenWidth;  // 根据屏幕编号计算起始列索引uint32_t rowIdx, colIdx;uint8_t *dataPtr = data;for (rowIdx = startRowIdx; rowIdx < startRowIdx + screenHeight; rowIdx++){uint8_t *rowPtr = (uint8_t *)lcdCRPtr->scanout->map_addr + rowIdx * lcdCRPtr->scanout->pitch;for (colIdx = startColIdx; colIdx < startColIdx + screenWidth; colIdx++){uint8_t *pixel = rowPtr + colIdx * 4;memcpy(pixel, dataPtr, 4);dataPtr += 4;}}
}void draw_lcd_screen_rgb_nine(uint8_t *data, uint32_t dataSize, uint8_t part)
{uint32_t startRowIdx, startColIdx;uint32_t partWidth = LCD_SCREEN_WIDTH / 3;uint32_t partHeight = LCD_SCREEN_HEIGHT / 3;// 计算起始行和列索引startRowIdx = (part / 3) * partHeight; // 根据部分的行来计算起始行索引startColIdx = (part % 3) * partWidth;  // 根据部分的列来计算起始列索引uint32_t rowIdx, colIdx;uint8_t *dataPtr = data;for (rowIdx = startRowIdx; rowIdx < startRowIdx + partHeight; rowIdx++){uint8_t *rowPtr = (uint8_t *)lcdCRPtr->scanout->map_addr + rowIdx * lcdCRPtr->scanout->pitch;for (colIdx = startColIdx; colIdx < startColIdx + partWidth; colIdx++){uint8_t *pixel = rowPtr + colIdx * 4;memcpy(pixel, dataPtr, 4);dataPtr += 4;}}
}void draw_lcd_screen_rgb_quarter(uint8_t *data, uint32_t dataSize, uint8_t quarter)
{uint32_t startRowIdx, startColIdx;switch (quarter){case 0: // 左上角startRowIdx = 0;startColIdx = 0;break;case 1: // 右上角startRowIdx = 0;startColIdx = LCD_SCREEN_WIDTH / 2;break;case 2: // 左下角startRowIdx = LCD_SCREEN_HEIGHT / 2;startColIdx = 0;break;case 3: // 右下角startRowIdx = LCD_SCREEN_HEIGHT / 2;startColIdx = LCD_SCREEN_WIDTH / 2;break;default: // 默认为左上角startRowIdx = 0;startColIdx = 0;break;}uint32_t rowIdx, colIdx;uint8_t *dataPtr = data;for (rowIdx = startRowIdx; rowIdx < startRowIdx + LCD_SCREEN_HEIGHT / 2; rowIdx++){uint8_t *rowPtr = (uint8_t *)lcdCRPtr->scanout->map_addr + rowIdx * lcdCRPtr->scanout->pitch;for (colIdx = startColIdx; colIdx < startColIdx + LCD_SCREEN_WIDTH / 2; colIdx++){uint8_t *pixel = rowPtr + colIdx * 4;memcpy(pixel, dataPtr, 4);dataPtr += 4;}}
}void draw_lcd_screen_rgb(uint8_t *data, uint32_t dataSize)
{uint32_t colIdx = 0;uint32_t rowIdx = 0;uint8_t *dataPtr = data;for (rowIdx = 0; rowIdx < LCD_SCREEN_WIDTH; rowIdx++){uint8_t *rowPtr = (uint8_t *)lcdCRPtr->scanout->map_addr + rowIdx * lcdCRPtr->scanout->pitch;for (colIdx = 0; colIdx < LCD_SCREEN_HEIGHT; colIdx++){uint8_t *pixel = rowPtr + colIdx * 4;memcpy(pixel, dataPtr, 4);dataPtr += 4;
#if 0uint8_t *pixel = rowPtr + colIdx * 4;pixel[0] = *dataPtr;dataPtr++;pixel[1] = *dataPtr;dataPtr++;pixel[2] = *dataPtr;dataPtr++;pixel[3] = 0xff;
#endif}}
}

3、格式转换显示

使用的是正点原子的5.5寸屏，在调试过程中，一直卡在显示部分，后面才发现，正点原子使用的是竖屏，横屏显示会出现问题。

修改mpp_decoder_frame_callback函数，解码后的格式是420_SP，需要转成BGRA8888格式才能显示，使用RGA转换格式

memset(&src_rect, 0, sizeof(src_rect));memset(&dst_rect, 0, sizeof(dst_rect));memset(&src1, 0, sizeof(src1));memset(&dst1, 0, sizeof(dst1));printf("resize with RGA!\n");resize_buf = (unsigned char *)malloc(1280 * 720 * 3);memset(resize_buf, 0, 1280 * 720 * 3);printf("=========> width_stride: %d, height_stride: %d\n", width_stride, height_stride);src1 = wrapbuffer_virtualaddr((unsigned char *)mpp_frame_addr, width_stride, height_stride, RK_FORMAT_YCbCr_420_SP, width_stride, height_stride);dst1 = wrapbuffer_virtualaddr((unsigned char*)resize_buf, 720, 1280, RK_FORMAT_BGR_888);ret = imcheck(src1, dst1, src_rect, dst_rect);if (IM_STATUS_NOERROR != ret) {printf("%d, check error! %s", __LINE__, imStrError((IM_STATUS)ret));free(resize_buf);return ;}IM_STATUS STATUS = imresize(src1, dst1);//MySaveBmp("out.bmp", (unsigned char *)resize_buf, 1280, 720);// 显示在屏目上。printf("draw_lcd_screen_rgb_960==============>\n");draw_lcd_screen_rgb_960((uint8_t *)resize_buf, 1280 * 720 * 3);printf("draw_lcd_screen_rgb_960 ok\n");free(resize_buf);

需要注意 dst1 = wrapbuffer_virtualaddr((unsigned char*)resize_buf, 720, 1280, RK_FORMAT_BGR_888);，原本图片是1280*720，需要对调才能正常显示。

三、推流

先准备一个1280*720的视频，使用的是FFMPEG方式推流，但直接推流是无法拉流的，所以先启动一个RTSP服务器。

服务器下载地址Releases · aler9/rtsp-simple-server · GitHub

启动rtsp-simple-server

下载完成后解压缩然后执行里面的rtsp-simple-server.exe

ffmpeg推流直接使用命令

ffmpeg -re -stream_loop -1 -i test.mp4 -c copy -f rtsp rtsp://192.168.0.107:8554/stream

四、程序解析

// Copyright (c) 2023 by Rockchip Electronics Co., Ltd. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// 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./*-------------------------------------------Includes
-------------------------------------------*/
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>#include "im2d.h"
#include "rga.h"
#include "RgaUtils.h"#include "rknn_api.h"
#include "postprocess.h"#include "utils/mpp_decoder.h"
#include "utils/mpp_encoder.h"
#include "utils/drawing.h"
#include "im2d_buffer.h"
#include "screen_test.h"
#if defined(BUILD_VIDEO_RTSP)
#include "mk_mediakit.h"#endif#define OUT_VIDEO_PATH "out.h264"#define LOG_TAG "MPP_API"static FILE *g_save_nv12;    // nv12 typedef struct {rknn_context rknn_ctx;rknn_input_output_num io_num;rknn_tensor_attr* input_attrs;rknn_tensor_attr* output_attrs;int model_channel;int model_width;int model_height;FILE* out_fp;MppDecoder* decoder;MppEncoder* encoder;
} rknn_app_context_t;typedef struct {int width;int height;int width_stride;int height_stride;int format;char* virt_addr;int fd;
} image_frame_t;/*-------------------------------------------Functions
-------------------------------------------*/static void dump_tensor_attr(rknn_tensor_attr* attr)
{printf("  index=%d, name=%s, n_dims=%d, dims=[%d, %d, %d, %d], n_elems=%d, size=%d, fmt=%s, type=%s, qnt_type=%s, ""zp=%d, scale=%f\n",attr->index, attr->name, attr->n_dims, attr->dims[0], attr->dims[1], attr->dims[2], attr->dims[3],attr->n_elems, attr->size, get_format_string(attr->fmt), get_type_string(attr->type),get_qnt_type_string(attr->qnt_type), attr->zp, attr->scale);
}double __get_us(struct timeval t) { return (t.tv_sec * 1000000 + t.tv_usec); }static unsigned char* load_data(FILE* fp, size_t ofst, size_t sz)
{unsigned char* data;int ret;data = NULL;if (NULL == fp) {return NULL;}ret = fseek(fp, ofst, SEEK_SET);if (ret != 0) {printf("blob seek failure.\n");return NULL;}data = (unsigned char*)malloc(sz);if (data == NULL) {printf("buffer malloc failure.\n");return NULL;}ret = fread(data, 1, sz, fp);return data;
}static unsigned char* read_file_data(const char* filename, int* model_size)
{FILE* fp;unsigned char* data;fp = fopen(filename, "rb");if (NULL == fp) {printf("Open file %s failed.\n", filename);return NULL;}fseek(fp, 0, SEEK_END);int size = ftell(fp);data = load_data(fp, 0, size);fclose(fp);*model_size = size;return data;
}static int write_data_to_file(const char *path, char *data, unsigned int size) {FILE *fp;fp = fopen(path, "w");if(fp == NULL) {printf("open error: %s", path);return -1;}fwrite(data, 1, size, fp);fflush(fp);fclose(fp);return 0;
}static int init_model(const char* model_path, rknn_app_context_t* app_ctx) {int ret;rknn_context ctx;/* Create the neural network */printf("Loading mode...\n");int model_data_size = 0;unsigned char* model_data = read_file_data(model_path, &model_data_size);if (model_data == NULL) {return -1;}ret = rknn_init(&ctx, model_data, model_data_size, 0, NULL);if (ret < 0) {printf("rknn_init error ret=%d\n", ret);return -1;}if (model_data) {free(model_data);}rknn_sdk_version version;ret = rknn_query(ctx, RKNN_QUERY_SDK_VERSION, &version, sizeof(rknn_sdk_version));if (ret < 0) {printf("rknn_query RKNN_QUERY_SDK_VERSION error ret=%d\n", ret);return -1;}printf("sdk version: %s driver version: %s\n", version.api_version, version.drv_version);ret = rknn_query(ctx, RKNN_QUERY_IN_OUT_NUM, &app_ctx->io_num, sizeof(rknn_input_output_num));if (ret < 0) {printf("rknn_query RKNN_QUERY_IN_OUT_NUM error ret=%d\n", ret);return -1;}printf("model input num: %d, output num: %d\n", app_ctx->io_num.n_input, app_ctx->io_num.n_output);rknn_tensor_attr* input_attrs = (rknn_tensor_attr*)malloc(app_ctx->io_num.n_input * sizeof(rknn_tensor_attr));memset(input_attrs, 0, sizeof(input_attrs));for (int i = 0; i < app_ctx->io_num.n_input; i++) {input_attrs[i].index = i;ret = rknn_query(ctx, RKNN_QUERY_INPUT_ATTR, &(input_attrs[i]), sizeof(rknn_tensor_attr));if (ret < 0) {printf("rknn_query RKNN_QUERY_INPUT_ATTR error ret=%d\n", ret);return -1;}dump_tensor_attr(&(input_attrs[i]));}rknn_tensor_attr* output_attrs = (rknn_tensor_attr*)malloc(app_ctx->io_num.n_output * sizeof(rknn_tensor_attr));memset(output_attrs, 0, sizeof(output_attrs));for (int i = 0; i < app_ctx->io_num.n_output; i++) {output_attrs[i].index = i;ret = rknn_query(ctx, RKNN_QUERY_OUTPUT_ATTR, &(output_attrs[i]), sizeof(rknn_tensor_attr));if (ret < 0) {printf("rknn_query RKNN_QUERY_OUTPUT_ATTR error ret=%d\n", ret);return -1;}dump_tensor_attr(&(output_attrs[i]));}app_ctx->input_attrs = input_attrs;app_ctx->output_attrs = output_attrs;app_ctx->rknn_ctx = ctx;if (input_attrs[0].fmt == RKNN_TENSOR_NCHW) {printf("model is NCHW input fmt\n");app_ctx->model_channel = input_attrs[0].dims[1];app_ctx->model_height  = input_attrs[0].dims[2];app_ctx->model_width   = input_attrs[0].dims[3];} else {printf("model is NHWC input fmt\n");app_ctx->model_height  = input_attrs[0].dims[1];app_ctx->model_width   = input_attrs[0].dims[2];app_ctx->model_channel = input_attrs[0].dims[3];}printf("model input height=%d, width=%d, channel=%d\n", app_ctx->model_height, app_ctx->model_width, app_ctx->model_channel);return 0;
}static int release_model(rknn_app_context_t* app_ctx) {if (app_ctx->rknn_ctx != NULL) {rknn_destroy(app_ctx->rknn_ctx);}free(app_ctx->input_attrs);free(app_ctx->output_attrs);deinitPostProcess();return 0;
}static int inference_model(rknn_app_context_t* app_ctx, image_frame_t* img, detect_result_group_t* detect_result) {int ret;rknn_context ctx = app_ctx->rknn_ctx;int model_width = app_ctx->model_width;int model_height = app_ctx->model_height;int model_channel = app_ctx->model_channel;struct timeval start_time, stop_time;const float    nms_threshold      = NMS_THRESH;const float    box_conf_threshold = BOX_THRESH;// You may not need resize when src resulotion equals to dst resulotionvoid* resize_buf = nullptr;// init rga contextrga_buffer_t src;rga_buffer_t dst;im_rect      src_rect;im_rect      dst_rect;memset(&src_rect, 0, sizeof(src_rect));memset(&dst_rect, 0, sizeof(dst_rect));memset(&src, 0, sizeof(src));memset(&dst, 0, sizeof(dst));printf("input image %dx%d stride %dx%d format=%d\n", img->width, img->height, img->width_stride, img->height_stride, img->format);float scale_w = (float)model_width / img->width;float scale_h = (float)model_height / img->height;rknn_input inputs[1];memset(inputs, 0, sizeof(inputs));inputs[0].index        = 0;inputs[0].type         = RKNN_TENSOR_UINT8;inputs[0].size         = model_width * model_height * model_channel;inputs[0].fmt          = RKNN_TENSOR_NHWC;inputs[0].pass_through = 0;printf("resize with RGA!\n");resize_buf = malloc(model_width * model_height * model_channel);memset(resize_buf, 0, model_width * model_height * model_channel);src = wrapbuffer_virtualaddr((void*)img->virt_addr, img->width, img->height, img->format, img->width_stride, img->height_stride);dst = wrapbuffer_virtualaddr((void*)resize_buf, model_width, model_height, RK_FORMAT_RGB_888);ret = imcheck(src, dst, src_rect, dst_rect);if (IM_STATUS_NOERROR != ret) {printf("%d, check error! %s", __LINE__, imStrError((IM_STATUS)ret));return -1;}IM_STATUS STATUS = imresize(src, dst);inputs[0].buf = resize_buf;gettimeofday(&start_time, NULL);rknn_inputs_set(ctx, app_ctx->io_num.n_input, inputs);rknn_output outputs[app_ctx->io_num.n_output];memset(outputs, 0, sizeof(outputs));for (int i = 0; i < app_ctx->io_num.n_output; i++) {outputs[i].want_float = 0;}ret = rknn_run(ctx, NULL);ret = rknn_outputs_get(ctx, app_ctx->io_num.n_output, outputs, NULL);gettimeofday(&stop_time, NULL);printf("once run use %f ms\n", (__get_us(stop_time) - __get_us(start_time)) / 1000);printf("post process config: box_conf_threshold = %.2f, nms_threshold = %.2f\n", box_conf_threshold, nms_threshold);std::vector<float> out_scales;std::vector<int32_t> out_zps;for (int i = 0; i < app_ctx->io_num.n_output; ++i) {out_scales.push_back(app_ctx->output_attrs[i].scale);out_zps.push_back(app_ctx->output_attrs[i].zp);}post_process((int8_t*)outputs[0].buf, (int8_t*)outputs[1].buf, (int8_t*)outputs[2].buf, model_height, model_width,box_conf_threshold, nms_threshold, scale_w, scale_h, out_zps, out_scales, detect_result);ret = rknn_outputs_release(ctx, app_ctx->io_num.n_output, outputs);if (resize_buf) {free(resize_buf);}return 0;
}typedef struct                       /**** BMP file info structure ****/  
{  unsigned int   biSize;           /* Size of info header */  int            biWidth;          /* Width of image */  int            biHeight;         /* Height of image */  unsigned short biPlanes;         /* Number of color planes */  unsigned short biBitCount;       /* Number of bits per pixel */  unsigned int   biCompression;    /* Type of compression to use */  unsigned int   biSizeImage;      /* Size of image data */  int            biXPelsPerMeter;  /* X pixels per meter */  int            biYPelsPerMeter;  /* Y pixels per meter */  unsigned int   biClrUsed;        /* Number of colors used */  unsigned int   biClrImportant;   /* Number of important colors */  
} BITMAPINFOHEADER;typedef struct                       /**** BMP file header structure ****/  
{  unsigned int   bfSize;           /* Size of file */  unsigned short bfReserved1;      /* Reserved */  unsigned short bfReserved2;      /* ... */  unsigned int   bfOffBits;        /* Offset to bitmap data */  
} BITMAPFILEHEADER; void MySaveBmp(const char *filename,unsigned char *rgbbuf,int width,int height)  
{  BITMAPFILEHEADER bfh;  BITMAPINFOHEADER bih;  /* * Magic number for file. It does not fit in the header structure due to * alignment requirements, so put it outside * 文件的魔术字，由于对齐的需要，没办法将魔术字作为BITMAPFILEHEADER的成员，所以* 这里将魔术字放在BITMAPFILEHEADER开头外面的位置。*/  unsigned short bfType=0x4d42;    //'BM'             bfh.bfReserved1 = 0;  bfh.bfReserved2 = 0;  bfh.bfSize = 2/* 2B魔术字 */+sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)+width*height*3;  bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);  bih.biSize = sizeof(BITMAPINFOHEADER);  bih.biWidth = width;  bih.biHeight = height;  bih.biPlanes = 1;  bih.biBitCount = 24;  bih.biCompression = 0;  bih.biSizeImage = 0;  bih.biXPelsPerMeter = 5000;  bih.biYPelsPerMeter = 5000;  bih.biClrUsed = 0;  bih.biClrImportant = 0;  FILE *file = fopen(filename, "wb");  if (!file)  {  printf("Could not write file\n");  return;  }  /*Write headers*/  fwrite(&bfType,sizeof(bfType),1,file);  fwrite(&bfh,sizeof(bfh),1, file);  fwrite(&bih,sizeof(bih),1, file);  fwrite(rgbbuf,width*height*3,1,file);  fclose(file);  
}// MPP解码回调函数
void mpp_decoder_frame_callback(void* userdata, int width_stride, int height_stride, int width, int height, int format, int fd, void* data) {rknn_app_context_t* ctx = (rknn_app_context_t*)userdata;int ret = 0;static int frame_index = 0;frame_index++;void* mpp_frame = NULL;int mpp_frame_fd = 0;void* mpp_frame_addr = NULL;int mpp_frame_size;int enc_data_size;rga_buffer_t origin;rga_buffer_t src;rga_buffer_t src1;rga_buffer_t dst1;unsigned char *resize_buf = nullptr;im_rect      src_rect;im_rect      dst_rect;// 编码器初始化if (ctx->encoder == NULL) {MppEncoder* mpp_encoder = new MppEncoder();MppEncoderParams enc_params;memset(&enc_params, 0, sizeof(MppEncoderParams));enc_params.width = width;enc_params.height = height;enc_params.hor_stride = width_stride;enc_params.ver_stride = height_stride;enc_params.fmt = MPP_FMT_YUV420SP;//enc_params.type = MPP_VIDEO_CodingHEVC;//Note: rk3562只能支持h264格式的视频流enc_params.type = MPP_VIDEO_CodingAVC;mpp_encoder->Init(enc_params, NULL);ctx->encoder = mpp_encoder;}int enc_buf_size = ctx->encoder->GetFrameSize();char* enc_data = (char*)malloc(enc_buf_size);// 图片格式image_frame_t img;img.width = width;img.height = height;img.width_stride = width_stride;img.height_stride = height_stride;img.fd = fd;img.virt_addr = (char*)data;img.format = RK_FORMAT_YCbCr_420_SP;detect_result_group_t detect_result;memset(&detect_result, 0, sizeof(detect_result_group_t));// RKNN推理ret = inference_model(ctx, &img, &detect_result);if (ret != 0) {printf("inference model fail\n");if(enc_data)free(enc_data);return ;}mpp_frame = ctx->encoder->GetInputFrameBuffer();mpp_frame_fd = ctx->encoder->GetInputFrameBufferFd(mpp_frame);mpp_frame_addr = ctx->encoder->GetInputFrameBufferAddr(mpp_frame);mpp_frame_size = ctx->encoder->GetFrameSize();// 图片格式转换// Copy To another buffer avoid to modify mpp decoder bufferprintf("wrapbuffer_fd==> width: %d, height: %d\n", width, height);origin = wrapbuffer_fd(fd, width, height, RK_FORMAT_YCbCr_420_SP, width_stride, height_stride);src = wrapbuffer_fd(mpp_frame_fd, width, height, RK_FORMAT_YCbCr_420_SP, width_stride, height_stride);imcopy(origin, src);// Draw objectsfor (int i = 0; i < detect_result.count; i++) {detect_result_t* det_result = &(detect_result.results[i]);printf("%s @ (%d %d %d %d) %f\n", det_result->name, det_result->box.left, det_result->box.top,det_result->box.right, det_result->box.bottom, det_result->prop);int x1 = det_result->box.left;int y1 = det_result->box.top;int x2 = det_result->box.right;int y2 = det_result->box.bottom;// 画框draw_rectangle_yuv420sp((unsigned char*)mpp_frame_addr, width_stride, height_stride, x1, y1, x2-x1+1, y2-y1+1, 0x00FF0000, 4);}//  保存原始视频流#if 0if (g_save_nv12) {fwrite((unsigned char*)mpp_frame_addr, 1, mpp_frame_size, g_save_nv12);printf("#Save len-%d to %s\n", mpp_frame_size, g_save_nv12);}#endif// 格式转换，420_SP转成BGR888memset(&src_rect, 0, sizeof(src_rect));memset(&dst_rect, 0, sizeof(dst_rect));memset(&src1, 0, sizeof(src1));memset(&dst1, 0, sizeof(dst1));printf("resize with RGA!\n");resize_buf = (unsigned char *)malloc(1280 * 720 * 3);memset(resize_buf, 0, 1280 * 720 * 3);printf("=========> width_stride: %d, height_stride: %d\n", width_stride, height_stride);src1 = wrapbuffer_virtualaddr((unsigned char *)mpp_frame_addr, width_stride, height_stride, RK_FORMAT_YCbCr_420_SP, width_stride, height_stride);dst1 = wrapbuffer_virtualaddr((unsigned char*)resize_buf, 720, 1280, RK_FORMAT_BGR_888);ret = imcheck(src1, dst1, src_rect, dst_rect);if (IM_STATUS_NOERROR != ret) {printf("%d, check error! %s", __LINE__, imStrError((IM_STATUS)ret));free(resize_buf);return ;}IM_STATUS STATUS = imresize(src1, dst1);//MySaveBmp("out.bmp", (unsigned char *)resize_buf, 1280, 720);// 显示在屏目上。printf("draw_lcd_screen_rgb_960==============>\n");draw_lcd_screen_rgb_960((uint8_t *)resize_buf, 1280 * 720 * 3);printf("draw_lcd_screen_rgb_960 ok\n");free(resize_buf);printf("waite get char to next step!\n");//getchar();printf("====>Encode\n");// Encode to file// Write header on first frameif (frame_index == 1) {enc_data_size = ctx->encoder->GetHeader(enc_data, enc_buf_size);fwrite(enc_data, 1, enc_data_size, ctx->out_fp);}printf("====>GetHeader ok\n");memset(enc_data, 0, enc_buf_size);enc_data_size = ctx->encoder->Encode(mpp_frame, enc_data, enc_buf_size);printf("====>Encode ok\n");fwrite(enc_data, 1, enc_data_size, ctx->out_fp);if (enc_data != nullptr) {free(enc_data);}printf("fwrite ok\n");}int process_video_file(rknn_app_context_t* ctx, const char* path)
{int video_size;char* video_data = (char*)read_file_data(path, &video_size);char* video_data_end = video_data + video_size;printf("read video size=%d\n", video_size);const int SIZE = 8192;char* video_data_ptr = video_data;do {int pkt_eos = 0;int size = SIZE;if (video_data_ptr + size >= video_data_end) {pkt_eos = 1;size = video_data_end - video_data_ptr;}ctx->decoder->Decode((uint8_t*)video_data_ptr, size, pkt_eos);video_data_ptr += size;if (video_data_ptr >= video_data_end) {printf("reset decoder\n");break;}// LOGD("video_data_ptr=%p video_data_end=%p", video_data_ptr, video_data_end);// usleep(10*1000);} while (1);return 0;
}#if defined(BUILD_VIDEO_RTSP)
void API_CALL on_track_frame_out(void *user_data, mk_frame frame) {rknn_app_context_t *ctx = (rknn_app_context_t *) user_data;printf("on_track_frame_out ctx=%p\n", ctx);const char* data = mk_frame_get_data(frame);size_t size = mk_frame_get_data_size(frame);printf("decoder=%p\n", ctx->decoder);ctx->decoder->Decode((uint8_t*)data, size, 0);
}void API_CALL on_mk_play_event_func(void *user_data, int err_code, const char *err_msg, mk_track tracks[],int track_count) {rknn_app_context_t *ctx = (rknn_app_context_t *) user_data;if (err_code == 0) {//successprintf("play success!");int i;for (i = 0; i < track_count; ++i) {if (mk_track_is_video(tracks[i])) {log_info("got video track: %s", mk_track_codec_name(tracks[i]));//监听track数据回调mk_track_add_delegate(tracks[i], on_track_frame_out, user_data);}}} else {printf("play failed: %d %s", err_code, err_msg);}
}void API_CALL on_mk_shutdown_func(void *user_data, int err_code, const char *err_msg, mk_track tracks[], int track_count) {printf("play interrupted: %d %s", err_code, err_msg);
}// 下面为Zlmeidia拉流处理
int process_video_rtsp(rknn_app_context_t* ctx, const char* url)
{mk_config config;memset(&config, 0, sizeof(mk_config));config.log_mask = LOG_CONSOLE;mk_env_init(&config);mk_player player = mk_player_create();mk_player_set_on_result(player, on_mk_play_event_func, ctx);mk_player_set_on_shutdown(player, on_mk_shutdown_func, ctx);mk_player_play(player, url);printf("enter any key to exit\n");getchar();if (player) {mk_player_release(player);}return 0;
}
#endif/*-------------------------------------------Main Functions
-------------------------------------------*/
int main(int argc, char** argv)
{int status = 0;int ret;if (argc != 4) {printf("Usage: %s <rknn_model> <video_path> <video_type 264/265> \n", argv[0]);return -1;}char* model_name = (char*)argv[1];char* video_name = argv[2];int video_type = atoi(argv[3]);rknn_app_context_t app_ctx;memset(&app_ctx, 0, sizeof(rknn_app_context_t));ret = init_model(model_name, &app_ctx);if (ret != 0) {printf("init model fail\n");return -1;}// MPP解码器if (app_ctx.decoder == NULL) {MppDecoder* decoder = new MppDecoder();decoder->Init(video_type, 30, &app_ctx);decoder->SetCallback(mpp_decoder_frame_callback);app_ctx.decoder = decoder;}// 视频保存if (app_ctx.out_fp == NULL) {FILE* fp = fopen(OUT_VIDEO_PATH, "w");if(fp == NULL) {printf("open %s error\n", OUT_VIDEO_PATH);return -1;}app_ctx.out_fp = fp;}// NV12保存g_save_nv12 = fopen("output.nv12", "w");if (!g_save_nv12)printf("#VENC TEST:: Open ./output.nv12 failed!\n");printf("app_ctx=%p decoder=%p\n", &app_ctx, app_ctx.decoder);// 判断是不是RTSP流还是文件if (strncmp(video_name, "rtsp", 4) == 0) {
#if defined(BUILD_VIDEO_RTSP)// DRM初始化drm_dis_init();// 拉流处理process_video_rtsp(&app_ctx, video_name);
#elseprintf("rtsp no support\n");
#endif} else {// 文件流处理process_video_file(&app_ctx, video_name);}printf("waiting finish\n");usleep(3*1000*1000);// releasefflush(app_ctx.out_fp);fclose(app_ctx.out_fp);if (app_ctx.decoder != nullptr) {delete(app_ctx.decoder);app_ctx.decoder = nullptr;}if (app_ctx.encoder != nullptr) {delete(app_ctx.encoder);app_ctx.encoder = nullptr;}release_model(&app_ctx);return 0;
}

通过Zlmedia很方便的拉取RTSP流，并解码显示。使用DRM是为了多路显示。OPENCV只会显示一路，不知道怎么拼接流显示。

如有侵权，或需要完整代码，请及时联系博主。

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