ortp学习笔记

URL:http://blog.csdn.net/ajaxhe/article/details/7753239

ortp版本：ortp-0.18.0.tar.gz  

操作系统：window 7 32bit

1.windows下编译ortp.lib

直接打开ortp-0.18.0\build\win32native的工程文件即可，VS2008下无需任何修改，即可编译出动态链接库 ortp.lib以及ortp.dll。

2.使用ortp提供的测试程序：ortp-0.18.0\src\tests下的win_receive以及win_sender目录下程序

在windows7下使用win_receiver时会提示下如下错误，这个在错误在windows XP下是不存在的

QOSAddSocketToFlow failed to add a flow with error 87

具体问题暂时还没有深究，这个应该是一个系统兼容性问题，需要系统支持qwave.lib。

在查找了错误出处，对比了前几个ortp的版本后，对ortp0.18的源代码进行了修改

rtp_session_inet.c /* set socket options (but don't change chosen states) */ /*           rtp_session_set_dscp( session, -1 );           rtp_session_set_multicast_ttl( session, -1 );           rtp_session_set_multicast_loopback( session, -1 ); */

3. 发送H.264视频帧

ortp提供的win_receive以及win_sender一次只发送160字节的数据。但我们在发送一帧H.264视频帧，每次需要发送2000-3000字节的数据，关于ortp发送H.264视频帧，可以参考：

ortp编程示例代码

谈谈RTP传输中的负载类型和时间戳

除了上面两篇文章提到需要注意的负载类型和时间戳之外，在ortp中win_receive中还需要显示调用：

rtp_session_set_recv_buf_size(rtp_session_mgr .rtp_session , recv_bufsize);

这里的recv_bufsize必须要比win_sender中

sended_bytes = rtp_session_send_with_ts (rtp_session_mgr .rtp_session ,

                          ( uint8_t *) send_buffer,

                           wrapLen,

                          rtp_session_mgr.cur_timestamp );

的wrapLen要大，否则在receive端会出现如下错误：

ortp-warning-Error receiving RTP packet: Error code : 10040, err num [10040],error [-1]

---

4. 一个结合H.264编码，rtp发送，接收，保存mp4文件的小程序

下载地址：ortp测试程序（修改版）

编译环境：vs2008

压缩文件中包括了ffmpeg以及ortp的动态链接库，但你还需要在工程文件中修改它们的路径才能正确链接这两个库.

因为这个小程序是一个项目的一部分，源代码中还有些冗余代码，并没有来的及删掉，大家在看的时候需要注意下

receiver

 #include
 #include "ortp/ortp.h"

 extern "C"{
 #include
 #include
 };

 bool m_bExit = FALSE;

 struct RtpSessionMgr
 {
     RtpSession *rtp_session;
     int timestamp;
 };


 RtpSessionMgr rtp_session_mgr;
 const int timestamp_inc = 3600; // 90000/25

 const char recv_ip[] = "127.0.0.1";
 const int recv_port = 8008;
 const int recv_bufsize = 10240;
 unsigned char *recv_buf;

 /** 帧包头的标识长度 */
 #define CMD_HEADER_LEN 10

 /** 帧包头的定义 */
 static uint8_t CMD_HEADER_STR[CMD_HEADER_LEN] = { 0xAA,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xFF };

 /** 帧的包头信息 */
 typedef struct _sFrameHeader
 {
     /** 命令名称标识 */
     unsigned char cmdHeader[CMD_HEADER_LEN];

     /** 采集的通道号 0~7*/
     unsigned char chId;

     /** 数据类型，音频 或者 视频*/
     unsigned char dataType;

     /** 缓冲区的数据长度 */
     uint32_t len;

     /** 时间戳 */
     uint32_t timestamp;

 }FrameHeader;

 ///////ffmpeg///////////////////////////////////////////////////////////////////
 AVOutputFormat *fmt;
 AVFormatContext *oc;
 AVStream *video_st;
 AVCodecContext *codecContext;

 const int image_width = 704;
 const int image_height = 576;
 const int frame_rate = 25;
 static int frame_count;

 BOOL ctrlHandlerFunction(DWORD fdwCtrlType)
 {
     switch (fdwCtrlType)
     {
         // Handle the CTRL+C signal.
         // CTRL+CLOSE: confirm that the user wants to exit.
     case CTRL_C_EVENT:
     case CTRL_CLOSE_EVENT:
     case CTRL_BREAK_EVENT:
     case CTRL_LOGOFF_EVENT:
     case CTRL_SHUTDOWN_EVENT:
         m_bExit = TRUE;
         return TRUE;

     default:
         return FALSE;
     }
 }

 void rtpInit()
 {
     int ret;
     WSADATA wsaData;

     /** 初始化winsocket */
     if ( WSAStartup(MAKEWORD(2,2), &wsaData) != 0)
     {
         fprintf(stderr, "WAStartup failed!\n");
         return ;
     }

     ortp_init();
     ortp_scheduler_init();

     rtp_session_mgr.rtp_session = rtp_session_new(RTP_SESSION_RECVONLY);

     rtp_session_set_scheduling_mode(rtp_session_mgr.rtp_session, 1);
     rtp_session_set_blocking_mode(rtp_session_mgr.rtp_session, 1);
     rtp_session_set_local_addr(rtp_session_mgr.rtp_session, recv_ip, recv_port);

     rtp_session_enable_adaptive_jitter_compensation(rtp_session_mgr.rtp_session, TRUE);
     rtp_session_set_jitter_compensation(rtp_session_mgr.rtp_session, 40);

     rtp_session_set_payload_type(rtp_session_mgr.rtp_session, 34);
     rtp_session_set_recv_buf_size(rtp_session_mgr.rtp_session, recv_bufsize);

     rtp_session_mgr.timestamp = timestamp_inc;
 }

 int rtp2disk()
 {
     int err;
     int havemore = 1;

     while (havemore)
     {
         err = rtp_session_recv_with_ts(rtp_session_mgr.rtp_session,
                                         (uint8_t *)recv_buf, recv_bufsize,
                                         rtp_session_mgr.timestamp, &havemore);

         if (havemore)
             printf("==> Warning: havemore=1!\n");

         if (err > 0)
         {
             FrameHeader *frameHeader;

             printf("receive data is %d\n", err);

             frameHeader = (FrameHeader *)recv_buf;
             printf("frame_len = %d\n", frameHeader->len);

             AVPacket pkt;
             av_init_packet(&pkt);
             pkt.stream_index= video_st->index;
             pkt.data= recv_buf + sizeof(FrameHeader);
             pkt.size = frameHeader->len; // not the video_outbuf_size, note!
             // write the compressed frame in the media file
             err = av_write_frame(oc, &pkt);

             if (err != 0)
             {
                 printf("av_write_frame failed\n");
             }
         }
     }

     return 0;
 }

 AVCodecContext* createCodecContext(AVFormatContext *oc)
 {
     AVCodecContext *video_cc = avcodec_alloc_context();

     video_cc =  avcodec_alloc_context();
     if (!video_cc)
     {
         fprintf(stderr, "alloc avcodec context failed\n");
         exit(1);
     }

     video_cc->codec_id = (CodecID)CODEC_ID_H264;
     video_cc->codec_type = AVMEDIA_TYPE_VIDEO;

     video_cc->me_range = 16;
     video_cc->max_qdiff = 4;
     video_cc->qmin = 10;
     video_cc->qmax = 51;
     video_cc->qcompress = 0.6f;

     /* put sample parameters */
     video_cc->bit_rate = 400000;

     /* resolution must be a multiple of two */
     video_cc->width = image_width;
     video_cc->height = image_height;

     /* time base: this is the fundamental unit of time (in seconds) in terms
     of which frame timestamps are represented. for fixed-fps content,
     timebase should be 1/framerate and timestamp increments should be
     identically 1. */
     video_cc->time_base.den = frame_rate;
     video_cc->time_base.num = 1;

     video_cc->gop_size = 12; /* emit one intra frame every twelve frames at most */
     video_cc->pix_fmt = PIX_FMT_YUV420P;

     // some formats want stream headers to be separate
     if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))
         video_cc->flags |= CODEC_FLAG_GLOBAL_HEADER;

     return video_cc;
 }

 void openVideo(AVFormatContext *oc)
 {
     AVCodec *codec;

     /* find the video encoder */
     codec = avcodec_find_encoder(codecContext->codec_id);
     if (!codec) {
         fprintf(stderr, "codec not found\n");
         exit(1);
     }

     /* open the codec */
     if (avcodec_open(codecContext, codec) < 0) {
         fprintf(stderr, "could not open video codec\n");
         exit(1);
     }
 }

 void ffmpegEncodeInit()
 {
     // initialize libavcodec, and register all codecs and formats
     av_register_all();

     char filename[] = "test.mp4";
     fmt = av_guess_format(NULL, filename, NULL);

     oc = avformat_alloc_context();
     oc->oformat = fmt;

     fmt->video_codec = (CodecID) CODEC_ID_H264;
     _snprintf(oc->filename, sizeof(oc->filename), "%s", filename);

     // add the video streams using the default format codecs and initialize the codecs
     video_st = NULL;
     if (fmt->video_codec != CODEC_ID_NONE) {
         video_st = av_new_stream(oc, 0);
         if (!video_st) {
             fprintf(stderr, "Could not alloc stream\n");
             exit(1);
         }
     }

     // alloc codecContext
     codecContext = createCodecContext(oc);
     video_st->codec = codecContext;

     // set the output parameters (must be done even if no parameters).
     if (av_set_parameters(oc, NULL) < 0) {
         fprintf(stderr, "Invalid output format parameters\n");
         exit(1);
     }

     dump_format(oc, 0, filename, 1);

     /* now that all the parameters are set, we can open the audio and
     video codecs and allocate the necessary encode buffers */
     if (codecContext)
         openVideo(oc);

     // open the output file, if needed
     if (!(fmt->flags & AVFMT_NOFILE)) {
         if (url_fopen(&oc->pb, filename, URL_WRONLY) < 0) {
             fprintf(stderr, "Could not open '%s'\n", filename);
             exit(1);
         }
     }

     // write the stream header, if any
     av_write_header(oc);
 }

 void ffmpegEncodeClose()
 {
     int i;

     /* close each codec */
     if (video_st)
         avcodec_close(video_st->codec);

     // write the trailer, if any
     av_write_trailer(oc);

     /* free the streams */
     for(i = 0; i < oc->nb_streams; i++) {
         av_freep(&oc->streams[i]->codec);
         av_freep(&oc->streams[i]);
     }

     if (!(fmt->flags & AVFMT_NOFILE)) {
         /* close the output file */
         url_fclose(oc->pb);
     }

     /* free the stream */
     av_free(oc);
 }

 int main()
 {
     recv_buf = (uint8_t *)malloc(recv_bufsize);

     rtpInit();
     ffmpegEncodeInit();

     // =============== INSTALL THE CONTROL HANDLER ===============
     if (SetConsoleCtrlHandler( (PHANDLER_ROUTINE) ctrlHandlerFunction, TRUE) == 0)
     {
         printf("==> Cannot handle the CTRL-C...\n");
     }

     printf("==> RTP Receiver started\n");

     while (m_bExit == FALSE)
     {
         rtp2disk();

         rtp_session_mgr.timestamp += timestamp_inc;
     }

     printf("==> Exiting\n");

     free(recv_buf);

     ffmpegEncodeClose();

     rtp_session_destroy(rtp_session_mgr.rtp_session);
     ortp_exit();
 }

sender

 #include
 #include

 extern "C"{
 #include
 #include
 };

 struct RtpSessionMgr
 {
     RtpSession *rtp_session;
     uint32_t timestamp_inc;
     uint32_t cur_timestamp;
 };

 RtpSessionMgr rtp_session_mgr;

 const char g_ip[] = "127.0.0.1";
 const int g_port = 8008;
 const uint32_t timestamp_inc = 3600; // 90000 / 25

 const int image_width = 704;
 const int image_height = 576;
 const int frame_rate = 25;
 static int frame_count, wrap_size;

 AVCodecContext *video_cc;

 AVFrame *picture;

 /** 帧包头的标识长度 */
 #define CMD_HEADER_LEN 10

 /** 帧包头的定义 */
 static uint8_t CMD_HEADER_STR[CMD_HEADER_LEN] = { 0xAA,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xFF };

 /** 帧的包头信息 */
 typedef struct _sFrameHeader
 {
     /** 命令名称标识 */
     unsigned char cmdHeader[CMD_HEADER_LEN];

     /** 采集的通道号 0~7*/
     unsigned char chId;

     /** 数据类型，音频 或者 视频*/
     unsigned char dataType;

     /** 缓冲区的数据长度 */
     uint32_t len;

     /** 时间戳 */
     uint32_t timestamp;

 }FrameHeader;

 // set frame header
 FrameHeader frameHeader;

 void rtpInit()
 {
     char *m_SSRC;

     ortp_init();
     ortp_scheduler_init();
     printf("Scheduler initialized\n");

     rtp_session_mgr.rtp_session = rtp_session_new(RTP_SESSION_SENDONLY);

     rtp_session_set_scheduling_mode(rtp_session_mgr.rtp_session, 1);
     rtp_session_set_blocking_mode(rtp_session_mgr.rtp_session, 1);
     rtp_session_set_remote_addr(rtp_session_mgr.rtp_session, g_ip, g_port);
     rtp_session_set_send_payload_type(rtp_session_mgr.rtp_session, 34); // 34 is for H.263 video frame

     m_SSRC  = getenv("SSRC");
     if (m_SSRC != NULL)
     {
         rtp_session_set_ssrc(rtp_session_mgr.rtp_session, atoi(m_SSRC));
     }

     rtp_session_mgr.cur_timestamp = 0;
     rtp_session_mgr.timestamp_inc = timestamp_inc;

     printf("rtp init success!\n");
 }

 int rtpSend(unsigned char *send_buffer, int frame_len)
 {
     FrameHeader *fHeader = (FrameHeader *)send_buffer;
     fHeader->chId      = 0;
     fHeader->dataType  = 0; // SESSION_TYPE_VIDEO
     fHeader->len       = frame_len;
     fHeader->timestamp = 0;

     printf("frame header len = %d\n", fHeader->len);

     int wrapLen;
     wrapLen = frame_len + sizeof(FrameHeader);

     int sended_bytes;
     sended_bytes = rtp_session_send_with_ts(rtp_session_mgr.rtp_session,
                                             (uint8_t *)send_buffer,
                                             wrapLen,
                                             rtp_session_mgr.cur_timestamp);

     rtp_session_mgr.cur_timestamp += rtp_session_mgr.timestamp_inc;

     return sended_bytes;
 }

 void createCodecContext()
 {
     video_cc =  avcodec_alloc_context();
     if (!video_cc)
     {
         fprintf(stderr, "alloc avcodec context failed\n");
         exit(1);
     }

     video_cc->codec_id = (CodecID)CODEC_ID_H264;
     video_cc->codec_type = AVMEDIA_TYPE_VIDEO;

     video_cc->me_range = 16;
     video_cc->max_qdiff = 4;
     video_cc->qmin = 10;
     video_cc->qmax = 51;
     video_cc->qcompress = 0.6f;

     /* put sample parameters */
     video_cc->bit_rate = 400000;

     /* resolution must be a multiple of two */
     video_cc->width = image_width;
     video_cc->height = image_height;

     /* time base: this is the fundamental unit of time (in seconds) in terms
     of which frame timestamps are represented. for fixed-fps content,
     timebase should be 1/framerate and timestamp increments should be
     identically 1. */
     video_cc->time_base.den = frame_rate;
     video_cc->time_base.num = 1;

     video_cc->gop_size = 12; /* emit one intra frame every twelve frames at most */
     video_cc->pix_fmt = PIX_FMT_YUV420P;
 }

 AVFrame *allocPicture(int pix_fmt, int width, int height)
 {
     AVFrame *picture;
     uint8_t *picture_buf;
     int size;

     picture = avcodec_alloc_frame();
     if (!picture)
         return NULL;

     size = avpicture_get_size((PixelFormat)pix_fmt, width, height);
     picture_buf = (uint8_t *)av_malloc(size);
     if (!picture_buf) {
         av_free(picture);
         return NULL;
     }
     avpicture_fill((AVPicture *)picture, picture_buf, (PixelFormat)pix_fmt, width, height);
     return picture;
 }

 void openVideo()
 {
     AVCodec *video_codec;

     /* find the video encoder */
     video_codec = avcodec_find_encoder(video_cc->codec_id);
     if (!video_codec) {
         fprintf(stderr, "codec not found\n");
         exit(1);
     }

     /* open the codec */
     if (avcodec_open(video_cc, video_codec) < 0) {
         fprintf(stderr, "could not open video codec\n");
         exit(1);
     }

     /* allocate the encoded raw picture */
     picture = allocPicture(video_cc->pix_fmt, video_cc->width, video_cc->height);
     if (!picture) {
         fprintf(stderr, "Could not allocate picture\n");
         exit(1);
     }
 }

 /* prepare a dummy image */
 void fill_yuv_image(AVFrame *pict, int frame_index, int width, int height)
 {
     int x, y, i;

     i = frame_index;

     /* Y */
     for(y=0;y
         for(x=0;x
             pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
         }
     }

     /* Cb and Cr */
     for(y=0;y
         for(x=0;x
             pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
             pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
         }
     }
 }

 void ffmpegInit()
 {
     // initialize libavcodec, and register all codecs and formats
     av_register_all();

     // create a codec context
     createCodecContext();

     // open H.264 codec
     openVideo();
 }

 void getEncodedFrame(unsigned char *buffer, int& len)
 {
     int out_size;

     fill_yuv_image(picture, frame_count, video_cc->width, video_cc->height);

     // encode the frame
     out_size = avcodec_encode_video(video_cc, buffer, wrap_size-sizeof(FrameHeader), picture);

     len = out_size;
     frame_count++;
 }

 int main()
 {
     unsigned char *send_outbuf;
     unsigned char *video_part;

     frame_count = 0;
     wrap_size = 20000;
     send_outbuf = (unsigned char *)malloc(wrap_size);

     // copy cmdHeader to frameInfo
     memcpy(frameHeader.cmdHeader,CMD_HEADER_STR,CMD_HEADER_LEN);

     memcpy(send_outbuf, &frameHeader, sizeof(FrameHeader));
     video_part = send_outbuf + sizeof(FrameHeader);

     ffmpegInit();
     rtpInit();

     while (1)
     {
         int frame_len;
         // get encode frame
         getEncodedFrame(video_part, frame_len);

         printf("encodecFrame length is : %d\n", frame_len);

         if (frame_len > 0)
         {
             rtpSend(send_outbuf, frame_len);
         }
     }

     rtp_session_destroy(rtp_session_mgr.rtp_session);

     free(send_outbuf);

     // Give us some time
     Sleep(250);

     ortp_exit();
 }