转载地址：http://www.52codes.net/article/277.html
网上大多数的教程都是ffmpeg打开本地视频的教程，没有直接读取摄像头的教程的，有些摄像头都是rtsp的，这边吾爱的技术人员为大家提供了一个解决方案
ffmpeg直接获取摄像监控的rtsp实在远程监控，在线直播的功能
代码如下：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
#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()
{
}
|
再附上直接获取摄像头监控保存MP4文件的代码：