轉載地址：http://www.52codes.net/article/277.html
網上大多數的教程都是ffmpeg打開本地視頻的教程，沒有直接讀取攝像頭的教程的，有些攝像頭都是rtsp的，這邊吾愛的技術人員為大家提供了一個解決方案
ffmpeg直接獲取攝像監控的rtsp實在遠程監控，在線直播的功能
代碼如下：
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#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.（無法打開輸入流）\n"
);
return
;
}
if
(av_find_stream_info(pFormatCtx) < 0)
{
printf
(
"Couldn't find stream information.（無法獲取流信息）\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.（沒有找到視頻流）\n"
);
return
;
}
pCodecCtx = pFormatCtx->streams[videoindex]->codec;
pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
if
(pCodec == NULL)
{
printf
(
"Codec not found.（沒有找到解碼器）\n"
);
return
;
}
if
(avcodec_open2(pCodecCtx, pCodec, NULL) < 0)
{
printf
(
"Could not open codec.（無法打開解碼器）\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.（解碼錯誤）\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()
{
}
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再附上直接獲取攝像頭監控保存MP4文件的代碼：