利用ffmpeg实现最简单的视频播放功能

来源：互联网发布：faststone viewer mac 编辑：程序博客网时间：2024/04/24 16:16
本例子实现的视频播放功能100行代码左右。根据ffmpeg官方的指导来写的。对于新手可以研究下。
还是直接上代码：
/**author tongli*mail:2074929378@qq.com*/#include <stdio.h>extern "C"{#include "libavcodec/avcodec.h"#include "libavformat/avformat.h"#include "libswscale/swscale.h"#include "SDL.h"#include "SDL_thread.h"}int main(int argc, char* argv[]){AVFormatContext*pFormatCtx;inti, videoindex;AVCodecContext*pCodecCtx;AVCodec*pCodec;SDL_Event event;int got_picture;struct SwsContext *img_convert_ctx;AVPacket packet;AVFrame*pFrame;SDL_Rect rect;AVPicture pict;char *filename = "nihao.avi";av_register_all();//注册全部的编解码器，协议等。本质上是初始化几个static的链表avformat_network_init();pFormatCtx = avformat_alloc_context();//此处必须进行初始化。if (avformat_open_input(&pFormatCtx, filename, NULL, NULL) != 0){//根据文件名进行视频编码格式的判断printf("Couldn't open input stream.\n");return -1;}if (avformat_find_stream_info(pFormatCtx, NULL) < 0)//获取流的一些信息{printf("Couldn't find stream information.\n");return -1;}videoindex = -1;for (i = 0; i < pFormatCtx->nb_streams; i++){//找到视频流的索引if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO){videoindex = i;break;}}if (videoindex == -1){printf("Didn't find a video stream.\n");return -1;}pCodecCtx = pFormatCtx->streams[videoindex]->codec;pCodec = avcodec_find_decoder(pCodecCtx->codec_id);//找到解码器if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)//打开解码器{printf("Could not open codec.\n");return -1;}pFrame = av_frame_alloc();SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER);//初始化SDLSDL_Surface *screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 0, 0);SDL_Overlay *bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height, SDL_YV12_OVERLAY, screen);int y_size = pCodecCtx->width * pCodecCtx->height;//以前的函数形式是img_convet(...),现在由sws_getContexst(...)与sws_scale(...)共同来实现功能。就是将获取到的视频帧转换为目标图像格式img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);while (av_read_frame(pFormatCtx, &packet) >= 0)//获得数据包{if (packet.stream_index == videoindex)//检测数据包是不是视频包{avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, &packet);//所有的视频包是不是能组成一帧视频图像if (got_picture)//如果能合成一帧视频图像{SDL_LockYUVOverlay(bmp);pict.data[0] = bmp->pixels[0];pict.data[1] = bmp->pixels[2];pict.data[2] = bmp->pixels[1];pict.linesize[0] = bmp->pitches[0];pict.linesize[1] = bmp->pitches[2];pict.linesize[2] = bmp->pitches[1];sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height,pict.data, pict.linesize);SDL_UnlockYUVOverlay(bmp);rect.x = 0;rect.y = 0;rect.w = pCodecCtx->width;rect.h = pCodecCtx->height;SDL_DisplayYUVOverlay(bmp, &rect);SDL_Delay(40);//延迟40ms}}//SDL事件循环av_free_packet(&packet);SDL_PollEvent(&event);switch (event.type){case SDL_QUIT:SDL_Quit();exit(0);break;default:break;}}sws_freeContext(img_convert_ctx);avcodec_close(pCodecCtx);avformat_close_input(&pFormatCtx);return 0;}
源代码下载：100行左右的视频播放源码
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