题目：视频流在Windows系统上的实时捕捉与传输?

参考资料：以下资料都是我从网上找到并积累的，感觉都还可以，有参考价值。

有点兴奋，一周的成果，不容易呀，真心的。

从一个对视频这块一无所知的码农，到现在稍稍入门的码农。没有什么大的变化，不过还是了解到行行都比较难搞。

言归正传：开始讲讲 我的大致思路：如下图所示。

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其实，之前想过多种方案。

方案一：

比较靠谱点的是在linux下，用fifo传输数据，一边采集并转化为h264，linux自己可以转，这个比windows简单多了。

然后，live555这一端，用fifo（其实是管道）来搞，这样的好处在于 保证两个进程间通信。而且比较实时。

当然，在windows下，也可以通过进程间通信的方式来实现 有很多方式，这里面不多做介绍。

但是，还有更简单的方式，我们完全可以用多线程来实现，在另一个线程中，我们利用循环数组的方式实现，这样的话，可以保证实时性。

方案二：

用opencv采集数据，并可以对数据进行图像处理，然后，我们可以用libx264库对视频进行编码成h264格式，然后进行推送至rtsp服务器。

不过，这里的一个难点就是 libx264使用不太熟悉，导致后来我放弃了这种方案。

后来，看到雷神写的一篇文章，终于让我下定决心，用ffmpeg+live555来搞。

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如何实现：

关键点分析：

程序由三个线程组成： 一个采集并编码线程；一个将编码后的数据推送至rtsp264线程；一个主线程。线程之间传递数据利用循环数组实现。

整体结构如下：

下面一个个分析下实现思路：

• 采集并编码线程：

参考雷神的两篇日志

http://blog.csdn.net/leixiaohua1020/article/details/39759623
最简单的基于FFmpeg的内存读写的例子：内存转码器

http://blog.csdn.net/leixiaohua1020/article/details/39759163
最简单的基于FFmpeg的内存读写的例子：内存播放器

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• 将编码后的数据推送至rtsp264线程

参考网上两个哥们的日志

http://bubuko.com/infodetail-272265.html

Windows下利用live555实现H264实时流RTSP发送

http://blog.csdn.net/xiejiashu/article/details/8269873

用live555做本地视频采集转发,附源码

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主要是重写getnextframe 代码

整个代码如下：

1. #include "global.h"
2. #include "FFmpegReadCamera.h"
3. #include "H264LiveVideoServerMediaSubssion.hh"
4. #include "H264FramedLiveSource.hh"
5. #include "liveMedia.hh"
6. #include "BasicUsageEnvironment.hh"
7. ?
8. #define BUFSIZE 10000
9. ?
10. DWORD WINAPI ChildFunc1(LPVOID);
11. DWORD WINAPI ChildFunc2(LPVOID);
12. ?
13. ?
14. static
    void announceStream(RTSPServer* rtspServer, ServerMediaSession* sms,char
    const* streamName)//显示RTSP连接信息
15. {
16. ???char* url = rtspServer->rtspURL(sms);
17. ???UsageEnvironment& env = rtspServer->envir();
18. ???env <<streamName<< "\n";
19. ???env << "Play this stream using the URL \"" << url << "\"\n";
20. ???delete[] url;
21. }
22. ?
23. int main(int argc, char** argv)
24. {
25. ???for (int i = 0; i < ARRAYLENGTH; ++i)
26. ???{
27. ??????memset(&szbuffer[i],0,sizeof(StreamData));
28. ???}
29. ?
30. ???CreateThread(NULL,0,ChildFunc1,0,0,NULL);
31. ???Sleep(3000);
32. ???CreateThread(NULL,0,ChildFunc2,0,0,NULL);
33. ???while(1)
34. ???{
35. ??????Sleep(1);
36. ???}
37. ????return 0;
38. ?
39. }
40. ?
41. DWORD WINAPI ChildFunc1(LPVOID p)
42. {
43. ???int ret;
44. ???AVFormatContext *ofmt_ctx = NULL;
45. ???AVStream *out_stream;
46. ???AVStream *in_stream;
47. ???AVCodecContext *enc_ctx;
48. ???AVCodecContext *dec_ctx;
49. ???AVCodec* encoder;
50. ???enum AVMediaType type;
51. ???fp_write = fopen("test.h264","wb+");
52. ???unsigned int stream_index;
53. ???AVPacket enc_pkt;
54. ???int enc_got_frame;
55. ?
56. ???AVFormatContext *pFormatCtx;
57. ???int i, videoindex;
58. ???AVCodecContext *pCodecCtx;
59. ???AVCodec *pCodec;
60. ?
61. ???av_register_all();
62. ?
63. ???avformat_network_init();
64. ???pFormatCtx = avformat_alloc_context();
65. ?
66. ???avformat_alloc_output_context2(&ofmt_ctx,NULL,"h264",NULL);
67. ?
68. ???//Register Device 注册所有硬件
69. ???avdevice_register_all();
70. ???//Show Dshow Device 显示所有可用的硬件
71. ???show_dshow_device();
72. ???//Show Device Options 显示某一个硬件的所有参数（摄像头参数）
73. ???show_dshow_device_option();
74. ???//Show VFW Options
75. ???show_vfw_device();
76. ???//Windows
77. #ifdef _WIN32
78. #if USE_DSHOW
79. ???AVInputFormat *ifmt=av_find_input_format("dshow");
80. ???//Set own video device‘s name
81. ???if(avformat_open_input(&pFormatCtx,"video=Integrated Webcam",ifmt,NULL)!=0){
82. ??????printf("Couldn‘t open input stream.（无法打开输入流）\n");
83. ??????return -1;
84. ???}
85. #else
86. ???AVInputFormat *ifmt=av_find_input_format("vfwcap");
87. ???if(avformat_open_input(&pFormatCtx,"0",ifmt,NULL)!=0){
88. ??????printf("Couldn‘t open input stream.（无法打开输入流）\n");
89. ??????return -1;
90. ???}
91. #endif
92. #endif
93. ???//Linux
94. #ifdef linux
95. ???AVInputFormat *ifmt=av_find_input_format("video4linux2");
96. ???if(avformat_open_input(&pFormatCtx,"/dev/video0",ifmt,NULL)!=0){
97. ??????printf("Couldn‘t open input stream.（无法打开输入流）\n");
98. ??????return -1;
99. ???}
100. #endif
101. ?
102. ?
103. ???if(avformat_find_stream_info(pFormatCtx,NULL)<0)
104. ???{
105. ??????printf("Couldn‘t find stream information.（无法获取流信息）\n");
106. ??????return -1;
107. ???}
108. ???videoindex=-1;
109. ???for(i=0; i<pFormatCtx->nb_streams; i++)
110. ??????if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
111. ??????{
112. ?????????videoindex=i;
113. ?????????break;
114. ??????}
115. ??????if(videoindex==-1)
116. ??????{
117. ?????????printf("Couldn‘t find a video stream.（没有找到视频流）\n");
118. ?????????return -1;
119. ??????}
120. ?
121. ??????pCodecCtx=pFormatCtx->streams[videoindex]->codec;
122. ??????pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
123. ??????if(pCodec==NULL)
124. ??????{
125. ?????????printf("Codec not found.（没有找到解码器）\n");
126. ?????????return -1;
127. ??????}
128. ??????if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)
129. ??????{
130. ?????????printf("Could not open codec.（无法打开解码器）\n");
131. ?????????return -1;
132. ??????}
133. ?
134. ??????AVFrame *pFrame,*pFrameYUV;
135. ??????pFrame=avcodec_alloc_frame();
136. ??????pFrameYUV=avcodec_alloc_frame();
137. ??????int length = avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
138. ??????uint8_t *out_buffer=(uint8_t *)av_malloc(length);
139. ?
140. ?
141. ??????/*open output file*/
142. ??????AVIOContext *avio_out = avio_alloc_context(out_buffer,length,0,NULL,NULL,write_buffer,NULL);
143. ??????if (avio_out == NULL)
144. ??????{
145. ?????????printf("申请内存失败！ \n");
146. ?????????return -1;
147. ??????}
148. ?
149. ??????ofmt_ctx->pb = avio_out;
150. ??????ofmt_ctx->flags = AVFMT_FLAG_CUSTOM_IO;
151. ??????for(int i = 0; i < 1; i++)
152. ??????{
153. ?????????out_stream = avformat_new_stream(ofmt_ctx,NULL);
154. ?????????if (!out_stream)
155. ?????????{
156. ????????????av_log(NULL,AV_LOG_ERROR,"failed allocating output stream");
157. ????????????return AVERROR_UNKNOWN;
158. ?????????}
159. ?????????in_stream = pFormatCtx->streams[i];
160. ?????????dec_ctx = in_stream->codec;
161. ?????????enc_ctx = out_stream->codec;
162. ?????????//设置编码格式
163. ?????????if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
164. ?????????{
165. ????????????encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
166. ????????????enc_ctx->height = dec_ctx->height;
167. ????????????enc_ctx->width = dec_ctx->width;
168. ????????????enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
169. ????????????enc_ctx->pix_fmt = encoder->pix_fmts[0];
170. ????????????enc_ctx->time_base = dec_ctx->time_base;
171. ????????????enc_ctx->me_range = 16;
172. ????????????enc_ctx->max_qdiff = 4;
173. ????????????enc_ctx->qmin = 10;//10 这两个值调节清晰度
174. ????????????enc_ctx->qmax = 51;//51
175. ????????????enc_ctx->qcompress = 0.6;
176. ????????????enc_ctx->refs = 3;
177. ????????????enc_ctx->bit_rate = 500000;
178. ?
179. ????????????//enc_ctx->time_base.num = 1;
180. ????????????//enc_ctx->time_base.den = 25;
181. ????????????//enc_ctx->gop_size = 10;
182. ????????????//enc_ctx->bit_rate = 3000000;
183. ?
184. ????????????ret = avcodec_open2(enc_ctx,encoder,NULL);
185. ????????????if (ret < 0)
186. ????????????{
187. ???????????????av_log(NULL,AV_LOG_ERROR,"Cannot open video encoder for stream #%u\n",i);
188. ???????????????return ret;
189. ????????????}
190. ????????????//av_opt_set(enc_ctx->priv_data,"tune","zerolatency",0);
191. ?????????}
192. ?????????else
     if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN)
193. ?????????{
194. ????????????av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
195. ????????????return AVERROR_INVALIDDATA;
196. ?????????}
197. ?????????else
198. ?????????{
199. ????????????// if this stream must be remuxed
200. ????????????ret = avcodec_copy_context(ofmt_ctx->streams[i]->codec,pFormatCtx->streams[i]->codec);
201. ????????????if (ret < 0)
202. ????????????{
203. ???????????????av_log(NULL, AV_LOG_ERROR, "Copying stream context failed\n");
204. ???????????????return ret;
205. ????????????}
206. ?????????}
207. ?????????if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
208. ?????????{
209. ????????????enc_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
210. ?????????}
211. ??????}
212. ??????// init muxer, write output file header
213. ??????ret = avformat_write_header(ofmt_ctx,NULL);
214. ??????if (ret < 0)
215. ??????{
216. ?????????if (ret < 0)
217. ?????????{
218. ????????????av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
219. ????????????return ret;
220. ?????????}
221. ??????}
222. ?
223. ??????i = 0;
224. ??????// pCodecCtx 解码的codec_context
225. ??????avpicture_fill((AVPicture *)pFrameYUV, out_buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
226. ??????//SDL----------------------------
227. ??????if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
228. ?????????printf( "Could not initialize SDL - %s\n", SDL_GetError());
229. ?????????return -1;
230. ??????}
231. ??????int screen_w=0,screen_h=0;
232. ??????SDL_Surface *screen;
233. ??????screen_w = pCodecCtx->width;
234. ??????screen_h = pCodecCtx->height;
235. ??????screen = SDL_SetVideoMode(screen_w, screen_h, 0,0);
236. ?
237. ??????if(!screen) {
238. ?????????printf("SDL: could not set video mode - exiting:%s\n",SDL_GetError());
239. ?????????return -1;
240. ??????}
241. ??????SDL_Overlay *bmp;
242. ??????bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,SDL_YV12_OVERLAY, screen);
243. ??????SDL_Rect rect;
244. ??????//SDL End------------------------
245. ??????int got_picture;
246. ?
247. ??????AVPacket *packet=(AVPacket *)av_malloc(sizeof(AVPacket));
248. ??????//Output Information-----------------------------
249. ??????printf("File Information（文件信息）---------------------\n");
250. ??????av_dump_format(pFormatCtx,0,NULL,0);
251. ??????printf("-------------------------------------------------\n");
252. ?
253. #if OUTPUT_YUV420P
254. ??????FILE *fp_yuv=fopen("output.yuv","wb+");
255. #endif
256. ?
257. ??????struct SwsContext *img_convert_ctx;
258. ??????img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
259. ??????//------------------------------
260. ??????//read all packets
261. ??????while(av_read_frame(pFormatCtx, packet)>=0)
262. ??????{
263. ?????????if(packet->stream_index==videoindex)
264. ?????????{
265. ?
266. ????????????type = pFormatCtx->streams[packet->stream_index]->codec->codec_type;
267. ????????????stream_index = packet->stream_index;
268. ????????????av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n",stream_index);
269. ?
270. ????????????if (!pFrame)
271. ????????????{
272. ???????????????ret = AVERROR(ENOMEM);
273. ???????????????break;
274. ????????????}
275. ????????????packet->dts = av_rescale_q_rnd(packet->dts,
276. ???????????????pFormatCtx->streams[stream_index]->time_base,
277. ???????????????pFormatCtx->streams[stream_index]->codec->time_base,
278. ???????????????(AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
279. ????????????packet->pts = av_rescale_q_rnd(packet->pts,
280. ???????????????pFormatCtx->streams[stream_index]->time_base,
281. ???????????????pFormatCtx->streams[stream_index]->codec->time_base,
282. ???????????????(AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
283. ????????????ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
284. ????????????printf("Decode 1 Packet\tsize:%d\tpts:%d\n",packet->size,packet->pts);
285. ????????????if(ret < 0)
286. ????????????{
287. ???????????????printf("Decode Error.（解码错误）\n");
288. ???????????????av_frame_free(&pFrame);
289. ???????????????return -1;
290. ????????????}
291. ????????????if(got_picture)
292. ????????????{
293. ???????????????//这句话是转换格式的函数，可用将rgb变为yuv格式
294. ???????????????sws_scale(img_convert_ctx, (const
     uint8_t* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
295. ???????????????//下面对转换为YUV格式的AVFramer进行编码即可
296. ???????????????pFrameYUV->width = pFrame->width;
297. ???????????????pFrameYUV->height = pFrame->height;
298. ?
299. ???????????????/*pFrameYUV->pts = av_frame_get_best_effort_timestamp(pFrameYUV);
300. ???????????????pFrameYUV->pict_type = AV_PICTURE_TYPE_NONE;*/
301. ?
302. ???????????????enc_pkt.data = NULL;
303. ???????????????enc_pkt.size = 0;
304. ???????????????av_init_packet(&enc_pkt);
305. ???????????????enc_pkt.data = out_buffer;
306. ???????????????enc_pkt.size = length;
307. ?
308. ???????????????//编码必须是YUV420P格式，不然编码不会成功。
309. ???????????????ret = avcodec_encode_video2(ofmt_ctx->streams[stream_index]->codec,&enc_pkt,pFrameYUV,&enc_got_frame);
310. ???????????????printf("Encode 1 Packet\tsize:%d\tpts:%d\n",enc_pkt.size,enc_pkt.pts);
311. ???????????????if (ret == 0) //一定要记得 ret 值为0 ，代表成功。-1 才是代表失败。
312. ???????????????{
313. ??????????????????fwrite(enc_pkt.data,enc_pkt.size,1,fp_write); //存储编码后的h264文件，可以作为测试用
314. ??????????????????memcpy(szbuffer[recvcount].str,enc_pkt.data,enc_pkt.size);
315. ??????????????????szbuffer[recvcount].len = enc_pkt.size;
316. ??????????????????recvcount = (recvcount + 1)%ARRAYLENGTH;
317. ???????????????}
318. ???????????????if (ret < 0)
319. ???????????????{
320. ??????????????????printf("encode failed");
321. ??????????????????return -1;
322. ???????????????}
323. ???????????????if (!enc_got_frame)
324. ???????????????{
325. ??????????????????continue;
326. ???????????????}
327. ?
328. ???????????????/* prepare packet for muxing */
329. ???????????????enc_pkt.stream_index = stream_index;
330. ???????????????enc_pkt.dts = av_rescale_q_rnd(enc_pkt.dts,
331. ??????????????????ofmt_ctx->streams[stream_index]->codec->time_base,
332. ??????????????????ofmt_ctx->streams[stream_index]->time_base,
333. ??????????????????(AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
334. ???????????????enc_pkt.pts = av_rescale_q_rnd(enc_pkt.pts,
335. ??????????????????ofmt_ctx->streams[stream_index]->codec->time_base,
336. ??????????????????ofmt_ctx->streams[stream_index]->time_base,
337. ??????????????????(AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
338. ???????????????enc_pkt.duration = av_rescale_q(enc_pkt.duration,
339. ??????????????????ofmt_ctx->streams[stream_index]->codec->time_base,
340. ??????????????????ofmt_ctx->streams[stream_index]->time_base);
341. ???????????????av_log(NULL, AV_LOG_INFO, "Muxing frame %d\n",i);
342. ???????????????/* mux encoded frame */
343. ???????????????av_write_frame(ofmt_ctx,&enc_pkt);
344. ???????????????if (ret < 0)
345. ???????????????{
346. ??????????????????printf("encode failed");
347. ??????????????????return -1;
348. ???????????????}
349. ?
350. #if OUTPUT_YUV420P
351. ???????????????int y_size=pCodecCtx->width*pCodecCtx->height;
352. ???????????????fwrite(pFrameYUV->data[0],1,y_size,fp_yuv); //Y
353. ???????????????fwrite(pFrameYUV->data[1],1,y_size/4,fp_yuv); //U
354. ???????????????fwrite(pFrameYUV->data[2],1,y_size/4,fp_yuv); //V
355. #endif
356. ???????????????SDL_LockYUVOverlay(bmp);
357. ???????????????bmp->pixels[0]=pFrameYUV->data[0];
358. ???????????????bmp->pixels[2]=pFrameYUV->data[1];
359. ???????????????bmp->pixels[1]=pFrameYUV->data[2];
360. ???????????????bmp->pitches[0]=pFrameYUV->linesize[0];
361. ???????????????bmp->pitches[2]=pFrameYUV->linesize[1];
362. ???????????????bmp->pitches[1]=pFrameYUV->linesize[2];
363. ???????????????SDL_UnlockYUVOverlay(bmp);
364. ???????????????rect.x = 0;
365. ???????????????rect.y = 0;
366. ???????????????rect.w = screen_w;
367. ???????????????rect.h = screen_h;
368. ???????????????SDL_DisplayYUVOverlay(bmp, &rect);
369. ???????????????//Delay 40ms
370. ???????????????SDL_Delay(40);
371. ????????????}
372. ?????????}
373. ?????????av_free_packet(packet);
374. ??????}
375. ?
376. ??????/* flush encoders */
377. ??????for (i = 0; i < 1; i++) {
378. ?????????/* flush encoder */
379. ?????????ret = flush_encoder(ofmt_ctx,i);
380. ?????????if (ret < 0) {
381. ????????????av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
382. ????????????return -1;
383. ?????????}
384. ??????}
385. ??????av_write_trailer(ofmt_ctx);
386. ?
387. ??????sws_freeContext(img_convert_ctx);
388. ?
389. #if OUTPUT_YUV420P
390. ??????fclose(fp_yuv);
391. #endif
392. ?
393. ??????SDL_Quit();
394. ?
395. ??????av_free(out_buffer);
396. ??????av_free(pFrameYUV);
397. ??????avcodec_close(pCodecCtx);
398. ??????avformat_close_input(&pFormatCtx);
399. ??????//fcloseall();
400. ??????return 0;
401. }
402. ?
403. DWORD WINAPI ChildFunc2(LPVOID p)
404. {
405. ???//设置环境
406. ???UsageEnvironment* env;
407. ???Boolean reuseFirstSource = False;//如果为"true"则其他接入的客户端跟第一个客户端看到一样的视频流，否则其他客户端接入的时候将重新播放
408. ???TaskScheduler* scheduler = BasicTaskScheduler::createNew();
409. ???env = BasicUsageEnvironment::createNew(*scheduler);
410. ?
411. ???//创建RTSP服务器
412. ???UserAuthenticationDatabase* authDB = NULL;
413. ???RTSPServer* rtspServer = RTSPServer::createNew(*env, 8554, authDB);
414. ???if (rtspServer == NULL) {
415. ??????*env << "Failed to create RTSP server: " << env->getResultMsg() << "\n";
416. ??????exit(1);
417. ???}
418. ???char
     const* descriptionString= "Session streamed by \"testOnDemandRTSPServer\"";
419. ?
420. ???//模拟实时流发送相关变量
421. ???int datasize;//数据区长度
422. ???unsigned char* databuf;//数据区指针
423. ???databuf = (unsigned char*)malloc(100000);
424. ???bool dosent;//rtsp发送标志位，为true则发送，否则退出
425. ?
426. ???//从文件中拷贝1M数据到内存中作为实时网络传输内存模拟，如果实时网络传输应该是双线程结构，记得在这里加上线程锁
427. ???//此外实时传输的数据拷贝应该是发生在H264FramedLiveSource文件中，所以这里只是自上往下的传指针过去给它
428. ????datasize = szbuffer[(recvcount+ARRAYLENGTH-1)%ARRAYLENGTH].len;
429. ???for (int i = 0; i < datasize; ++i)
430. ???{
431. ??????databuf[i] = szbuffer[(recvcount+ARRAYLENGTH-1)%ARRAYLENGTH].str[i];
432. ???}
433. ???dosent = true;
434. ???//fclose(pf);
435. ?
436. ???//上面的部分除了模拟网络传输的部分外其他的基本跟live555提供的demo一样，而下面则修改为网络传输的形式，为此重写addSubsession的第一个参数相关文件
437. ???char
     const* streamName = "h264test";
438. ???ServerMediaSession* sms = ServerMediaSession::createNew(*env, streamName, streamName,descriptionString);
439. ???sms->addSubsession(H264LiveVideoServerMediaSubssion::createNew(*env, reuseFirstSource, &datasize, databuf,&dosent));//修改为自己实现的H264LiveVideoServerMediaSubssion
440. ???rtspServer->addServerMediaSession(sms);
441. ???announceStream(rtspServer, sms, streamName);//提示用户输入连接信息
442. ?
443. ???env->taskScheduler().doEventLoop(); //循环等待连接（没有链接的话，进不去下一步，无法调试）
444. ?
445. ???free(databuf);//释放掉内存
446. ???return 0;
447. }

Source核心代码：

1. void H264FramedLiveSource::doGetNextFrame()
2. {
3. ???if (*Framed_dosent == true)
4. ???{
5. ?
6. ?????bufsizel = szbuffer[(recvcount+ARRAYLENGTH-1)%ARRAYLENGTH].len;
7. ???if (bufsizel > fMaxSize)
8. ???{
9. ??????fFrameSize = fMaxSize;
10. ???}
11. ???else
12. ???{
13. ??????fFrameSize = bufsizel;
14. ???}
15. ???????/* for (int i = 0; i < fFrameSize; ++i)
16. ??????{
17. ?????????Framed_databuf[i] = szbuffer[(recvcount+ARRAYLENGTH-1)%ARRAYLENGTH].str[i];
18. ??????} */
19. ?????memcpy(fTo, szbuffer[(recvcount+ARRAYLENGTH-1)%ARRAYLENGTH].str, fFrameSize);
20. ???}
21. ???nextTask() = envir().taskScheduler().scheduleDelayedTask(0,(TaskFunc*)FramedSource::afterGetting, this);//表示延迟0秒后再执行 afterGetting 函数
22. ???return;
23. }

代码下载链接：

C:\Users\DELL\Desktop\ffmpeg开发\files 暂且在这，以后再改。