ffmpeg获取RTSP视频流信息
#include "FFPlayVeido.h"
FFPlayVedio::FFPlayVedio(HWND hwd)
{
char sdl_var[64];
sprintf(sdl_var, "SDL_WINDOWID=%d", hwd); //主窗口句柄
putenv(sdl_var);
//初始化
av_register_all();
avformat_network_init();
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
printf("Could not initialize SDL - %s\n", SDL_GetError());
return;
}
}
FFPlayVedio::~FFPlayVedio()
{
}
void FFPlayVedio::OnInit(HWND hwd)
{
}
void FFPlayVedio::GetVedioPlay( char *name)
{
AVFormatContext *pFormatCtx;
int i, videoindex;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
char filepath[] = "rtsp://admin:123456@192.168.1.252:554/mpeg4cif";
pFormatCtx = avformat_alloc_context();
if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0){
printf("Couldn't open input stream.(无法打开输入流)\n");
return ;
}
if (av_find_stream_info(pFormatCtx) < 0)
{
printf("Couldn't find stream information.(无法获取流信息)\n");
return ;
}
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.(没有找到视频流)\n");
return ;
}
pCodecCtx = pFormatCtx->streams[videoindex]->codec;
pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
if (pCodec == NULL)
{
printf("Codec not found.(没有找到解码器)\n");
return ;
}
if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)
{
printf("Could not open codec.(无法打开解码器)\n");
return ;
}
AVFrame *pFrame, *pFrameYUV;
pFrame = avcodec_alloc_frame();
pFrameYUV = avcodec_alloc_frame();
uint8_t *out_buffer = (uint8_t *)av_malloc(avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));
avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
//SDL---------------------------
int screen_w = 0, screen_h = 0;
//SDL 2.0 Support for multiple windows
SDL_Window *screen;
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 ;
}
SDL_Renderer* sdlRenderer = SDL_CreateRenderer(screen, -1, 0);
//IYUV: Y U V (3 planes)
//YV12: Y V U (3 planes)
SDL_Texture* sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, pCodecCtx->width, pCodecCtx->height);
SDL_Rect sdlRect;
sdlRect.x = 0;
sdlRect.y = 0;
sdlRect.w = screen_w;
sdlRect.h = screen_h;
//SDL End----------------------
int ret, got_picture;
AVPacket *packet = (AVPacket *)av_malloc(sizeof(AVPacket));
//Output Info-----------------------------
printf("File Information(文件信息)---------------------\n");
av_dump_format(pFormatCtx, 0, filepath, 0);
printf("-------------------------------------------------\n");
#if OUTPUT_YUV420P
FILE *fp_yuv = fopen("output.yuv", "wb ");
#endif
struct SwsContext *img_convert_ctx;
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)
{
if (packet->stream_index == videoindex)
{
ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
if (ret < 0)
{
printf("Decode Error.(解码错误)\n");
return ;
}
if (got_picture)
{
sws_scale(img_convert_ctx, (const uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
#if OUTPUT_YUV420P
int y_size = pCodecCtx->width*pCodecCtx->height;
fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv); //Y
fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv); //U
fwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv); //V
#endif
//SDL---------------------------
SDL_UpdateTexture(sdlTexture, &sdlRect, pFrameYUV->data[0], pFrameYUV->linesize[0]);
SDL_RenderClear(sdlRenderer);
SDL_RenderCopy(sdlRenderer, sdlTexture, &sdlRect, &sdlRect);
SDL_RenderPresent(sdlRenderer);
//SDL End-----------------------
//Delay 40ms
SDL_Delay(40);
}
}
av_free_packet(packet);
}
sws_freeContext(img_convert_ctx);
#if OUTPUT_YUV420P
fclose(fp_yuv);
#endif
SDL_Quit();
av_free(out_buffer);
av_free(pFrameYUV);
avcodec_close(pCodecCtx);
avformat_close_input(&pFormatCtx);
return ;
}
void FFPlayVedio::StopVedio()
{
}