最簡(jiǎn)單的基于FFMPEG+SDL的視頻播放器 ver2
相關(guān)代碼
/**
* 最簡(jiǎn)單的基于FFmpeg的視頻播放器2(SDL升級(jí)版)
* Simplest FFmpeg Player 2(SDL Update)
*
* 雷霄驊 Lei Xiaohua
* leixiaohua1020@126.com
* 中國(guó)傳媒大學(xué)/數(shù)字電視技術(shù)
* Communication University of China / Digital TV Technology
* http://blog.csdn.net/leixiaohua1020
*
* 第2版使用SDL2.0取代了第一版中的SDL1.2
* Version 2 use SDL 2.0 instead of SDL 1.2 in version 1.
*
* 本程序?qū)崿F(xiàn)了視頻文件的解碼和顯示(支持HEVC塘娶，H.264，MPEG2等)。
* 是最簡(jiǎn)單的FFmpeg視頻解碼方面的教程嘱吗。
* 通過學(xué)習(xí)本例子可以了解FFmpeg的解碼流程掠剑。
* 本版本中使用SDL消息機(jī)制刷新視頻畫面览绿。
* This software is a simplest video player based on FFmpeg.
* Suitable for beginner of FFmpeg.
*
* 備注:
* 標(biāo)準(zhǔn)版在播放視頻的時(shí)候萍丐，畫面顯示使用延時(shí)40ms的方式相叁。這么做有兩個(gè)后果：
* （1）SDL彈出的窗口無法移動(dòng)柄冲，一直顯示是忙碌狀態(tài)
* （2）畫面顯示并不是嚴(yán)格的40ms一幀吻谋，因?yàn)檫€沒有考慮解碼的時(shí)間。
* SU（SDL Update）版在視頻解碼的過程中现横，不再使用延時(shí)40ms的方式漓拾，而是創(chuàng)建了
* 一個(gè)線程阁最，每隔40ms發(fā)送一個(gè)自定義的消息，告知主函數(shù)進(jìn)行解碼顯示骇两。這樣做之后：
* （1）SDL彈出的窗口可以移動(dòng)了
* （2）畫面顯示是嚴(yán)格的40ms一幀
* Remark:
* Standard Version use's SDL_Delay() to control video's frame rate, it has 2
* disadvantages:
* (1)SDL's Screen can't be moved and always "Busy".
* (2)Frame rate can't be accurate because it doesn't consider the time consumed
* by avcodec_decode_video2()
* SU（SDL Update）Version solved 2 problems above. It create a thread to send SDL
* Event every 40ms to tell the main loop to decode and show video frames.
*/
#include <stdio.h>
#define __STDC_CONSTANT_MACROS
#ifdef _WIN32
//Windows
extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/imgutils.h"
#include "SDL2/SDL.h"
};
#else
//Linux...
#ifdef __cplusplus
extern "C"
{
#endif
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavutil/imgutils.h>
#include <SDL2/SDL.h>
#ifdef __cplusplus
};
#endif
#endif
//Refresh Event
#define SFM_REFRESH_EVENT (SDL_USEREVENT + 1)
#define SFM_BREAK_EVENT (SDL_USEREVENT + 2)
int thread_exit=0;
int thread_pause=0;
int sfp_refresh_thread(void *opaque){
thread_exit=0;
thread_pause=0;
while (!thread_exit) {
if(!thread_pause){
SDL_Event event;
event.type = SFM_REFRESH_EVENT;
SDL_PushEvent(&event);
}
SDL_Delay(40);
}
thread_exit=0;
thread_pause=0;
//Break
SDL_Event event;
event.type = SFM_BREAK_EVENT;
SDL_PushEvent(&event);
return 0;
}
int main(int argc, char* argv[])
{
AVFormatContext *pFormatCtx;
int i, videoindex;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame,*pFrameYUV;
unsigned char *out_buffer;
AVPacket *packet;
int ret, got_picture;
//------------SDL----------------
int screen_w,screen_h;
SDL_Window *screen;
SDL_Renderer* sdlRenderer;
SDL_Texture* sdlTexture;
SDL_Rect sdlRect;
SDL_Thread *video_tid;
SDL_Event event;
struct SwsContext *img_convert_ctx;
//char filepath[]="bigbuckbunny_480x272.h265";
char filepath[]="Titanic.ts";
av_register_all();
avformat_network_init();
pFormatCtx = avformat_alloc_context();
if(avformat_open_input(&pFormatCtx,filepath,NULL,NULL)!=0){
printf("Couldn't open input stream.\n");
return -1;
}
if(avformat_find_stream_info(pFormatCtx,NULL)<0){
printf("Couldn't find stream information.\n");
return -1;
}
videoindex=-1;
for(i=0; i<pFormatCtx->nb_streams; i++)
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);
if(pCodec==NULL){
printf("Codec not found.\n");
return -1;
}
if(avcodec_open2(pCodecCtx, pCodec,NULL)<0){
printf("Could not open codec.\n");
return -1;
}
pFrame=av_frame_alloc();
pFrameYUV=av_frame_alloc();
out_buffer=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,1));
av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize,out_buffer,
AV_PIX_FMT_YUV420P,pCodecCtx->width, pCodecCtx->height,1);
//Output Info-----------------------------
printf("---------------- File Information ---------------\n");
av_dump_format(pFormatCtx,0,filepath,0);
printf("-------------------------------------------------\n");
img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,
pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
printf( "Could not initialize SDL - %s\n", SDL_GetError());
return -1;
}
//SDL 2.0 Support for multiple windows
screen_w = pCodecCtx->width;
screen_h = pCodecCtx->height;
screen = SDL_CreateWindow("Simplest ffmpeg player's Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
screen_w, screen_h,SDL_WINDOW_OPENGL);
if(!screen) {
printf("SDL: could not create window - exiting:%s\n",SDL_GetError());
return -1;
}
sdlRenderer = SDL_CreateRenderer(screen, -1, 0);
//IYUV: Y + U + V (3 planes)
//YV12: Y + V + U (3 planes)
sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING,pCodecCtx->width,pCodecCtx->height);
sdlRect.x=0;
sdlRect.y=0;
sdlRect.w=screen_w;
sdlRect.h=screen_h;
packet=(AVPacket *)av_malloc(sizeof(AVPacket));
video_tid = SDL_CreateThread(sfp_refresh_thread,NULL,NULL);
//------------SDL End------------
//Event Loop
for (;;) {
//Wait
SDL_WaitEvent(&event);
if(event.type==SFM_REFRESH_EVENT){
while(1){
if(av_read_frame(pFormatCtx, packet)<0)
thread_exit=1;
if(packet->stream_index==videoindex)
break;
}
ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
if(ret < 0){
printf("Decode Error.\n");
return -1;
}
if(got_picture){
sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
//SDL---------------------------
SDL_UpdateTexture( sdlTexture, NULL, pFrameYUV->data[0], pFrameYUV->linesize[0] );
SDL_RenderClear( sdlRenderer );
//SDL_RenderCopy( sdlRenderer, sdlTexture, &sdlRect, &sdlRect );
SDL_RenderCopy( sdlRenderer, sdlTexture, NULL, NULL);
SDL_RenderPresent( sdlRenderer );
//SDL End-----------------------
}
av_free_packet(packet);
}else if(event.type==SDL_KEYDOWN){
//Pause
if(event.key.keysym.sym==SDLK_SPACE)
thread_pause=!thread_pause;
}else if(event.type==SDL_QUIT){
thread_exit=1;
}else if(event.type==SFM_BREAK_EVENT){
break;
}
}
sws_freeContext(img_convert_ctx);
SDL_Quit();
//--------------
av_frame_free(&pFrameYUV);
av_frame_free(&pFrame);
avcodec_close(pCodecCtx);
avformat_close_input(&pFormatCtx);
return 0;
}
執(zhí)行步驟
- 將上述代碼建一個(gè)main.c
- 安裝 ffmepg 安裝sdl2 可能會(huì)踩坑 , 需要安裝sdl2 和ffmpeg
- 編譯main.c 到main.c 的目錄下
- 對(duì)main.c 進(jìn)行編譯
clang -g -o ffmpeg main.cpkg-config --libs libaormat libavutil libavcodec libswscale SDL2` - 運(yùn)行編譯好的文件
./ffmpeg
效果圖
Mac 下的樣式
image.png
