ffmpeg解码+opencv显示+时间测试

/**
* 抽取ffmpeg中的函数接口实现视频解码，再通过Opencv中的函数接口播放
*/

#define _CRTDBG_MAP_ALLOC
#include <crtdbg.h>

#define __STDC_CONSTANT_MACROS
#include <stdio.h>
#include <Windows.h>
#include <process.h>

// Opencv
#include <opencv/cv.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

#include "QueryPerformance.h"

extern "C"
{
#include "libavutil/avutil.h"
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
	//新版里的图像转换结构需要引入的头文件
#include "libswscale/swscale.h"
};

using namespace cv;

char filename[] = "cuc_ieschool.avi";

int main()
{
	***Codec *pCodec; //解码器指针
	***CodecContext* pCodecCtx; //ffmpeg解码类的类成员
	***Frame* pAvFrame; //多媒体帧，保存解码后的数据帧
	***FormatContext* pFormatCtx; //保存视频流的信息

	av_register_all(); //注册库中所有可用的文件格式和编码器

	pFormatCtx = avformat_alloc_context();
	if (avformat_open_input(&pFormatCtx, filename, NULL, NULL) != 0) { //检查文件头部
		printf("Can't find the stream!\n");
	}
	if (av_find_stream_info(pFormatCtx) < 0) { //查找流信息
		printf("Can't find the stream information !\n");
	}

	int videoindex = -1;
	for (int i=0; i < pFormatCtx->nb_streams; ++i) //遍历各个流，找到第一个视频流,并记录该流的编码信息
	{
		if (pFormatCtx->streams[i]->codec->codec_type == ***MEDIA_TYPE_VIDEO) {
			videoindex = i;
			break;
		}
	}
	if (videoindex == -1) {
		printf("Don't find a video stream !\n");
		return -1;
	}
	pCodecCtx = pFormatCtx->streams[videoindex]->codec; //得到一个指向视频流的上下文指针
	pCodec = avcodec_find_decoder(pCodecCtx->codec_id); //到该格式的解码器
		if (pCodec == NULL) {
			printf("Cant't find the decoder !\n"); //寻找解码器
			return -1;
		}
		if (avcodec_open2(pCodecCtx,pCodec,NULL) < 0) { //打开解码器
			printf("Can't open the decoder !\n");
			return -1;
		}

		pAvFrame = avcodec_alloc_frame(); //分配帧存储空间
		***Frame* pFrameBGR = avcodec_alloc_frame(); //存储解码后转换的RGB数据

		// 保存BGR，opencv中是按BGR来保存的
		int size = avpicture_get_size(***_PIX_FMT_BGR24, pCodecCtx->width, pCodecCtx->height);
		uint8_t *out_buffer = (uint8_t *)av_malloc(size);
		avpicture_fill((***Picture *)pFrameBGR, out_buffer, ***_PIX_FMT_BGR24, pCodecCtx->width, pCodecCtx->height);

		***Packet* packet = (***Packet*)malloc(sizeof(***Packet));
		printf("-----------输出文件信息---------\n");
		av_dump_format(pFormatCtx, 0, filename, 0);
		printf("------------------------------");

		struct SwsContext *img_convert_ctx;
		img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, ***_PIX_FMT_BGR24, SWS_BICUBIC, NULL, NULL, NULL); 

		//opencv
		cv::Mat pCvMat;
		pCvMat.create(cv::Size(pCodecCtx->width, pCodecCtx->height), CV_8UC3);

		int ret;
		int got_picture;

		cvNamedWindow("RGB", 1);
		CStopwatch stopwatchqq;
		int frame_counter = 0; //解码的帧数
		for (;;)
		{
			if(av_read_frame(pFormatCtx, packet)>=0)
			{
				if(packet->stream_index==videoindex)
				{
					//计时
					CStopwatch stopwatch;

					ret = avcodec_decode_video2(pCodecCtx, pAvFrame, &got_picture, packet);

					__int64 qwElapsedTime = stopwatch.Now(); // 单位为：毫秒(ms)
					printf("解码单帧的时间为：%d (ms)\n", qwElapsedTime);

					if(ret < 0)
					{
						printf("Decode Error.（解码错误）\n");
						return -1;
					}
					if (got_picture)
					{
						frame_counter++;
						//YUV to RGB
						sws_scale(img_convert_ctx, (const uint8_t* const*)pAvFrame->data, pAvFrame->linesize, 0, pCodecCtx->height, pFrameBGR->data, pFrameBGR->linesize);

						memcpy(pCvMat.data, out_buffer, size);
					    imshow("RGB", pCvMat);
					    waitKey(1);
					}
				}
				av_free_packet(packet);
			}
			else 
			{
				break;
			}
		}

		__int64 qwElapsedTimeqq = stopwatchqq.Now(); // 单位为：毫秒(ms)
		printf("\n总解码时间为：%d(ms)\n", qwElapsedTimeqq);
		printf("总视频帧数为：%d\n", frame_counter);

		av_free(out_buffer);
		av_free(pFrameBGR);
		av_free(pAvFrame);
		avcodec_close(pCodecCtx);
		avformat_close_input(&pFormatCtx);

		sws_freeContext(img_convert_ctx);
		cvDestroyWindow("RGB");

		system("pause");
		_CrtDumpMemoryLeaks();

		return 0;
}

/**
* 抽取ffmpeg中的函数接口实现视频解码，再通过Opencv中的函数接口播放
*/

#define _CRTDBG_MAP_ALLOC
#include <crtdbg.h>

#define __STDC_CONSTANT_MACROS
#include <stdio.h>
#include <Windows.h>
#include <process.h>

// Opencv
#include <opencv/cv.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

#include "QueryPerformance.h"

extern "C"
{
#include "libavutil/avutil.h"
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
	//新版里的图像转换结构需要引入的头文件
#include "libswscale/swscale.h"
};

using namespace cv;

char filename[] = "cuc_ieschool.avi";

int main()
{
	***Codec *pCodec; //解码器指针
	***CodecContext* pCodecCtx; //ffmpeg解码类的类成员
	***Frame* pAvFrame; //多媒体帧，保存解码后的数据帧
	***FormatContext* pFormatCtx; //保存视频流的信息

	av_register_all(); //注册库中所有可用的文件格式和编码器

	pFormatCtx = avformat_alloc_context();
	if (avformat_open_input(&pFormatCtx, filename, NULL, NULL) != 0) { //检查文件头部
		printf("Can't find the stream!\n");
	}
	if (av_find_stream_info(pFormatCtx) < 0) { //查找流信息
		printf("Can't find the stream information !\n");
	}

	int videoindex = -1;
	for (int i=0; i < pFormatCtx->nb_streams; ++i) //遍历各个流，找到第一个视频流,并记录该流的编码信息
	{
		if (pFormatCtx->streams[i]->codec->codec_type == ***MEDIA_TYPE_VIDEO) {
			videoindex = i;
			break;
		}
	}
	if (videoindex == -1) {
		printf("Don't find a video stream !\n");
		return -1;
	}
	pCodecCtx = pFormatCtx->streams[videoindex]->codec; //得到一个指向视频流的上下文指针
	pCodec = avcodec_find_decoder(pCodecCtx->codec_id); //到该格式的解码器
		if (pCodec == NULL) {
			printf("Cant't find the decoder !\n"); //寻找解码器
			return -1;
		}
		if (avcodec_open2(pCodecCtx,pCodec,NULL) < 0) { //打开解码器
			printf("Can't open the decoder !\n");
			return -1;
		}

		pAvFrame = avcodec_alloc_frame(); //分配帧存储空间
		***Frame* pFrameBGR = avcodec_alloc_frame(); //存储解码后转换的RGB数据

		// 保存BGR，opencv中是按BGR来保存的
		int size = avpicture_get_size(***_PIX_FMT_BGR24, pCodecCtx->width, pCodecCtx->height);
		uint8_t *out_buffer = (uint8_t *)av_malloc(size);
		avpicture_fill((***Picture *)pFrameBGR, out_buffer, ***_PIX_FMT_BGR24, pCodecCtx->width, pCodecCtx->height);

		***Packet* packet = (***Packet*)malloc(sizeof(***Packet));
		printf("-----------输出文件信息---------\n");
		av_dump_format(pFormatCtx, 0, filename, 0);
		printf("------------------------------");

		struct SwsContext *img_convert_ctx;
		img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, ***_PIX_FMT_BGR24, SWS_BICUBIC, NULL, NULL, NULL); 

		//opencv
		cv::Mat pCvMat;
		pCvMat.create(cv::Size(pCodecCtx->width, pCodecCtx->height), CV_8UC3);

		int ret;
		int got_picture;

		cvNamedWindow("RGB", 1);
		CStopwatch stopwatchqq;
		int frame_counter = 0; //解码的帧序号
		char buffer[50]; 
		for (;;)
		{
			if(av_read_frame(pFormatCtx, packet)>=0)
			{
				if(packet->stream_index==videoindex)
				{
					//计时
					CStopwatch stopwatch;

					ret = avcodec_decode_video2(pCodecCtx, pAvFrame, &got_picture, packet);

					__int64 qwElapsedTime = stopwatch.Now(); // 单位为：毫秒(ms)
//					printf("解码单帧的时间为：%d (ms)\n", qwElapsedTime);

					if(ret < 0)
					{
						printf("Decode Error.（解码错误）\n");
						return -1;
					}
					if (got_picture)
					{
						frame_counter++;
						sprintf(buffer, "./pic/%d.png", frame_counter);
						//YUV to RGB
						sws_scale(img_convert_ctx, (const uint8_t* const*)pAvFrame->data, pAvFrame->linesize, 0, pCodecCtx->height, pFrameBGR->data, pFrameBGR->linesize);

						memcpy(pCvMat.data, out_buffer, size);
					    imshow("RGB", pCvMat);
//						printf("pCvMat= %p\n", &pCvMat);
						imwrite(buffer, pCvMat);//将视频帧保存为png图片
					    waitKey(1);
					}
				}
				av_free_packet(packet);
			}
			else 
			{
				break;
			}
		}

		__int64 qwElapsedTimeqq = stopwatchqq.Now(); // 单位为：毫秒(ms)
		printf("\n总解码时间为：%d(ms)\n", qwElapsedTimeqq);
		printf("总视频帧数为：%d\n", frame_counter);

		av_free(out_buffer);
		av_free(pFrameBGR);
		av_free(pAvFrame);
		avcodec_close(pCodecCtx);
		avformat_close_input(&pFormatCtx);

		sws_freeContext(img_convert_ctx);
		cvDestroyWindow("RGB");

		system("pause");
		_CrtDumpMemoryLeaks();

		return 0;
}