使用FFMpeg进行H264编码 .

1 CFile file[5];
2 BYTE *szTxt[5];
3
4 int nWidth = 0;
5 int nHeight= 0;
6
7 int nDataLen=0;
8
9 int nLen;
10
11 CString csFileName;
12 for (int fileI = 1; fileI <= 5; fileI ++)
13 {
14   csFileName.Format("e:\\pics\\%d.bmp", fileI);
15   file[fileI - 1].Open(csFileName,CFile::modeRead | CFile::typeBinary);
16   nLen = file[fileI - 1].GetLength();
17
18   szTxt[fileI -1] = new BYTE[nLen];
19   file[fileI - 1].Read(szTxt[fileI - 1], nLen);
20   file[fileI - 1].Close();
21
22   //BMP bmi;//BITMAPINFO bmi;
23   //int nHeadLen = sizeof(BMP);
24   BITMAPFILEHEADER bmpFHeader;
25   BITMAPINFOHEADER bmpIHeader;
26   memcpy(&bmpFHeader,szTxt[fileI -1],sizeof(BITMAPFILEHEADER));
27
28   int nHeadLen = bmpFHeader.bfOffBits - sizeof(BITMAPFILEHEADER);
29   memcpy(&bmpIHeader,szTxt[fileI - 1]+sizeof(BITMAPFILEHEADER),nHeadLen);
30
31 nWidth = bmpIHeader.biWidth;// 464;// bmi.bmpInfo.bmiHeader.biWidth;// ;
32   nHeight = bmpIHeader.biHeight;//362;// bmi.bmpInfo.bmiHeader.biHeight;// ;
33
34   szTxt[fileI - 1] += bmpFHeader.bfOffBits;
35   nDataLen = nLen-bmpFHeader.bfOffBits;
36 }
37
38 av_register_all();
39 avcodec_register_all();
40 AVFrame *m_pRGBFrame =  new AVFrame[1];  //RGB帧数据
41 AVFrame *m_pYUVFrame = new AVFrame[1];;  //YUV帧数据
42 AVCodecContext *c= NULL;
43 AVCodecContext *in_c= NULL;
44 AVCodec *pCodecH264; //编码器
45 uint8_t * yuv_buff;//
46
47 //查找h264编码器
48 pCodecH264 = avcodec_find_encoder(CODEC_ID_H264);
49 if(!pCodecH264)
50 {
51   fprintf(stderr, "h264 codec not found\n");
52   exit(1);
53 }
54
55 c= avcodec_alloc_context3(pCodecH264);
56 c->bit_rate = 3000000;// put sample parameters
57 c->width =nWidth;//
58 c->height = nHeight;//
59
60 // frames per second
61 AVRational rate;
62 rate.num = 1;
63 rate.den = 25;
64 c->time_base= rate;//(AVRational){1,25};
65 c->gop_size = 10; // emit one intra frame every ten frames
66 c->max_b_frames=1;
67 c->thread_count = 1;
68 c->pix_fmt = PIX_FMT_YUV420P;//PIX_FMT_RGB24;
69
70 //av_opt_set(c->priv_data, /*"preset"*/"libvpx-1080p.ffpreset", /*"slow"*/NULL, 0);
71 //打开编码器
72 if(avcodec_open2(c,pCodecH264,NULL)<0)
73   TRACE("不能打开编码库");
74
75 int size = c->width * c->height;
76
77 yuv_buff = (uint8_t *) malloc((size * 3) / 2); // size for YUV 420
78
79 //将rgb图像数据填充rgb帧
80 uint8_t * rgb_buff = new uint8_t[nDataLen];
81
82 //图象编码
83 int outbuf_size=100000;
84 uint8_t * outbuf= (uint8_t*)malloc(outbuf_size);
85 int u_size = 0;
86 FILE *f=NULL;
87 char * filename = "e:\\pics\\myData.h264";
88 f = fopen(filename, "wb");
89 if (!f)
90 {
91   TRACE( "could not open %s\n", filename);
92   exit(1);
93 }
94
95 //初始化SwsContext
96 SwsContext * scxt = sws_getContext(c->width,c->height,PIX_FMT_BGR24,c->width,c->height,PIX_FMT_YUV420P,SWS_POINT,NULL,NULL,NULL);
97
98 AVPacket avpkt;
99
100 //AVFrame *pTFrame=new AVFrame
101 for (int i=0;i<250;++i)
102 {
103
104   //AVFrame *m_pYUVFrame = new AVFrame[1];
105
106   int index = (i / 25) % 5;
107   memcpy(rgb_buff,szTxt[index],nDataLen);
108
109   avpicture_fill((AVPicture*)m_pRGBFrame, (uint8_t*)rgb_buff, PIX_FMT_RGB24, nWidth, nHeight);
110
111   //将YUV buffer 填充YUV Frame
112   avpicture_fill((AVPicture*)m_pYUVFrame, (uint8_t*)yuv_buff, PIX_FMT_YUV420P, nWidth, nHeight);
113
114   // 翻转RGB图像
115   m_pRGBFrame->data[0]  += m_pRGBFrame->linesize[0] * (nHeight - 1);
116   m_pRGBFrame->linesize[0] *= -1;
117   m_pRGBFrame->data[1]  += m_pRGBFrame->linesize[1] * (nHeight / 2 - 1);
118   m_pRGBFrame->linesize[1] *= -1;
119   m_pRGBFrame->data[2]  += m_pRGBFrame->linesize[2] * (nHeight / 2 - 1);
120   m_pRGBFrame->linesize[2] *= -1;
121
122
123   //将RGB转化为YUV
124   sws_scale(scxt,m_pRGBFrame->data,m_pRGBFrame->linesize,0,c->height,m_pYUVFrame->data,m_pYUVFrame->linesize);
125
126   int got_packet_ptr = 0;
127   av_init_packet(&avpkt);
128   avpkt.data = outbuf;
129   avpkt.size = outbuf_size;
130   u_size = avcodec_encode_video2(c, &avpkt, m_pYUVFrame, &got_packet_ptr);
131   if (u_size == 0)
132   {
133    fwrite(avpkt.data, 1, avpkt.size, f);
134   }
135 }
136
137 fclose(f);
138 delete []m_pRGBFrame;
139 delete []m_pYUVFrame;
140 delete []rgb_buff;
141 free(outbuf);
142 avcodec_close(c);
143 av_free(c);