VS2008+ffmpeg_sdk 3.2 + sdl 播放视频

来源：互联网发布：itunes软件编辑：程序博客网时间：2024/05/21 09:24

VS2008+ffmpeg_sdk 3.2 + sdl 播放视频

分类： sdl FFmpeg 2012-02-22 18:32 1251人阅读评论(5)收藏举报

codecvideostreambufferfilenull

这次的笔记是基于我上一个笔记的基础上做的，主要是不要重复搭建环境，如果有不懂的，请先做 VS2008+ffmpeg SDK3.2调试tutorial01

第1步：

下载SDL-devel-1.2.15-VC.zip，下载地址：点击下载，我也上传了一份到115网盘http://115.com/file/an923mtd，并解压。

第2步：

将解压得到的sdl目录下的include文件夹拷到test.cpp同目录下，并将include文件夹改名为sdl

将sdl中的.h文件添加到工程的头文件。

第3步：

将解压的sdl目录下的lib/x86文件夹下的SDL.lib、SDLmain.lib拷贝至工程目录下的lib文件夹

在VS2008中，单击项目属性->链接器->输入,在附加依赖项中将SDL.lib、SDLmain.lib加入。

本来是还要将SDL.dll拷进debug目录的，但我看到里面本来就有了，就省了这一步，如果没有的，复制进去就可以了。

第4步：编写代码，测试

tes.cpp代码

[html] view plaincopyprint?

#include <stdio.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#ifdef __cplusplus
}
#endif
#include "sdl\SDL.h"
#include "sdl\SDL_thread.h"
#ifdef __MINGW32__
#undef main /* Prevents SDL from overriding main() */
#endif
void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) {
FILE *pFile;
char szFilename[32];
int y;
// Open file
sprintf(szFilename, "frame%d.ppm", iFrame);
pFile=fopen(szFilename, "wb");
if(pFile==NULL)
return;
// Write header
fprintf(pFile, "P6\n%d %d\n255\n", width, height);
// Write pixel data
for(y=0; y<height; y++)
fwrite(pFrame->data[0]+y*pFrame->linesize[0], 1, width*3, pFile);
// Close file
fclose(pFile);
}
int main() {
AVFormatContext *pFormatCtx;
int i, videoStream;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFrame *pFrame;
AVFrame *pFrameRGB;
AVPacket packet;
int frameFinished;
int numBytes;
uint8_t *buffer;
float aspect_ratio;
SDL_Overlay *bmp;
SDL_Surface *screen;
SDL_Rect rect;
SDL_Event event;
static struct SwsContext *img_convert_ctx;
char * filePath="test.mp4";
// Register all formats and codecs
av_register_all();
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
exit(1);
}
// Open video file
if(av_open_input_file(&pFormatCtx, filePath, NULL, 0, NULL)!=0)
return -1; // Couldn't open file
// Retrieve stream information
if(av_find_stream_info(pFormatCtx)<0)
return -1; // Couldn't find stream information
// Dump information about file onto standard error
dump_format(pFormatCtx, 0, filePath, 0);
// Find the first video stream
videoStream=-1;
for(i=0; i<pFormatCtx->nb_streams; i++)
if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO) {
videoStream=i;
break;
}
if(videoStream==-1)
return -1; // Didn't find a video stream
// Get a pointer to the codec context for the video stream
pCodecCtx=pFormatCtx->streams[videoStream]->codec;
// Find the decoder for the video stream
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==NULL) {
fprintf(stderr, "Unsupported codec!\n");
return -1; // Codec not found
}
// Open codec
if(avcodec_open(pCodecCtx, pCodec)<0)
return -1; // Could not open codec
// Allocate video frame
pFrame=avcodec_alloc_frame();
// Allocate an AVFrame structure
pFrameRGB=avcodec_alloc_frame();
if(pFrameRGB==NULL)
return -1;
// Make a screen to put our video
#ifndef __DARWIN__
screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 0, 0);
#else
screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 24, 0);
#endif
if(!screen) {
fprintf(stderr, "SDL: could not set video mode - exiting\n");
exit(1);
}
// Allocate a place to put our YUV image on that screen
bmp = SDL_CreateYUVOverlay(pCodecCtx->width,
pCodecCtx->height,
SDL_YV12_OVERLAY,
screen);
// Determine required buffer size and allocate buffer
numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
pCodecCtx->height);
buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
// Assign appropriate parts of buffer to image planes in pFrameRGB
// Note that pFrameRGB is an AVFrame, but AVFrame is a superset
// of AVPicture
avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
pCodecCtx->width, pCodecCtx->height);
// Read frames and save first five frames to disk
i=0;
while(av_read_frame(pFormatCtx, &packet)>=0) {
if(packet.stream_index==videoStream) {
// Decode video frame
avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,packet.data, packet.size);
if(frameFinished) {
SDL_LockYUVOverlay(bmp);
AVPicture pict;
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];
// Convert the image from its native format to RGB
img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height,pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height,PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
// Convert the image from its native format to RGB
sws_scale(img_convert_ctx, 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);
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(&packet);
SDL_PollEvent(&event);
switch(event.type) {
case SDL_QUIT:
SDL_Quit();
exit(0);
break;
default:
break;
}
}
// Free the RGB image
av_free(buffer);
av_free(pFrameRGB);
// Free the YUV frame
av_free(pFrame);
// Close the codec
avcodec_close(pCodecCtx);
// Close the video file
av_close_input_file(pFormatCtx);
printf("执行完毕\n");
system("pause");
return 0;
}

#include <stdio.h>#include <stdlib.h>#ifdef __cplusplusextern "C" {#endif#include "libavcodec/avcodec.h"#include "libavformat/avformat.h"#include "libswscale/swscale.h"#ifdef __cplusplus}#endif#include "sdl\SDL.h"#include "sdl\SDL_thread.h"#ifdef __MINGW32__#undef main /* Prevents SDL from overriding main() */#endifvoid SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) {  FILE *pFile;  char szFilename[32];  int  y;    // Open file  sprintf(szFilename, "frame%d.ppm", iFrame);  pFile=fopen(szFilename, "wb");  if(pFile==NULL)    return;    // Write header  fprintf(pFile, "P6\n%d %d\n255\n", width, height);    // Write pixel data  for(y=0; y<height; y++)    fwrite(pFrame->data[0]+y*pFrame->linesize[0], 1, width*3, pFile);    // Close file  fclose(pFile);}int main() {  AVFormatContext *pFormatCtx;  int             i, videoStream;  AVCodecContext  *pCodecCtx;  AVCodec         *pCodec;  AVFrame         *pFrame;   AVFrame         *pFrameRGB;  AVPacket        packet;  int             frameFinished;  int             numBytes;  uint8_t         *buffer;  float           aspect_ratio;  SDL_Overlay     *bmp;  SDL_Surface     *screen;  SDL_Rect        rect;  SDL_Event       event;  static struct SwsContext *img_convert_ctx;  char * filePath="test.mp4";  // Register all formats and codecs  av_register_all();  if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {    fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());    exit(1);  }    // Open video file  if(av_open_input_file(&pFormatCtx, filePath, NULL, 0, NULL)!=0)    return -1; // Couldn't open file    // Retrieve stream information  if(av_find_stream_info(pFormatCtx)<0)    return -1; // Couldn't find stream information    // Dump information about file onto standard error  dump_format(pFormatCtx, 0, filePath, 0);    // Find the first video stream  videoStream=-1;  for(i=0; i<pFormatCtx->nb_streams; i++)    if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO) {      videoStream=i;      break;    }  if(videoStream==-1)    return -1; // Didn't find a video stream  // Get a pointer to the codec context for the video stream  pCodecCtx=pFormatCtx->streams[videoStream]->codec;    // Find the decoder for the video stream  pCodec=avcodec_find_decoder(pCodecCtx->codec_id);  if(pCodec==NULL) {    fprintf(stderr, "Unsupported codec!\n");    return -1; // Codec not found  }  // Open codec  if(avcodec_open(pCodecCtx, pCodec)<0)    return -1; // Could not open codec    // Allocate video frame  pFrame=avcodec_alloc_frame();    // Allocate an AVFrame structure  pFrameRGB=avcodec_alloc_frame();  if(pFrameRGB==NULL)    return -1;  // Make a screen to put our video#ifndef __DARWIN__        screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 0, 0);#else        screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 24, 0);#endif  if(!screen) {    fprintf(stderr, "SDL: could not set video mode - exiting\n");    exit(1);  }   // Allocate a place to put our YUV image on that screen  bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height, SDL_YV12_OVERLAY, screen);      // Determine required buffer size and allocate buffer  numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,      pCodecCtx->height);  buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));    // Assign appropriate parts of buffer to image planes in pFrameRGB  // Note that pFrameRGB is an AVFrame, but AVFrame is a superset  // of AVPicture  avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height);  // Read frames and save first five frames to disk  i=0;  while(av_read_frame(pFormatCtx, &packet)>=0) {    if(packet.stream_index==videoStream) {      // Decode video frame avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,packet.data, packet.size);   if(frameFinished) {SDL_LockYUVOverlay(bmp);AVPicture pict;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];// Convert the image from its native format to RGBimg_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height,pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height,PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);// Convert the image from its native format to RGBsws_scale(img_convert_ctx, 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);   }}    // Free the packet that was allocated by av_read_frameav_free_packet(&packet);SDL_PollEvent(&event); switch(event.type) {case SDL_QUIT:SDL_Quit();exit(0);break;default:break; }  }  // Free the RGB image  av_free(buffer);  av_free(pFrameRGB);    // Free the YUV frame  av_free(pFrame);    // Close the codec  avcodec_close(pCodecCtx);    // Close the video file  av_close_input_file(pFormatCtx);    printf("执行完毕\n");  system("pause");  return 0;}

按F7编译，F5运行

写完收工，

由于没有调整帧，播放速度超快，下一步目标是调整速度，并调出声音。