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RTP - 视频流广播

Posted on 2008-08-27 15:20 猫头鹰 阅读(3830) 评论(4)  编辑 收藏 引用 所属分类: 视频学习之路

      这是用RTP(RFC3350)按RFC2550封装MPEG ES流数据的发送程序。学习RTP的路真的辛苦。在网上收集的有关RTP的程序都是那种只负责RTP数据包发送的库,如jrtplib等,他们的DEMO程序都只是用来发发字符串,编编聊天程序,无论是国内还是国外,都没有结合真正的应用的DEMO。其实我的目的很简单,就是写发个视频流服务器,不用复杂,只用把基本原理弄懂,因为这样你才能有的放矢。与网上和RTP相关的库没有应用不一让,当你尝试以流媒体服务器、linux来baidu或google时,你搜出来完非就那么几类:

1.FFSERVER
     FFMPEG2的DEMO,说它有名只是因为这类程序太少了。FFMPEG2是很好用,我现在还在用,但这个DEMO就有很多“炒作”的嫌疑了。好像在做着FFMPEG2库的演示而不是真的视频流服务器。后来想想,这不正是作者想要的吗,但这不是我想要的。编解码部分我会很偏向FFMPEG这个“大杂会”,其它部分我会选择其它的“强者”

2.Darwin、Helix
     两个都是非常有名软件,也只能称之为软件了,因为就算Darwin有源码,这种代码规模,也不适合用于嵌入式。说回软件本身,真的很有名。它们都是很真真拿来商业化运行的软件,但我是研发人员,不是视频流服务商,对不起,Apple,对不起,Microsoft。

3.LIVE555
     如果说上面两个和我都相关性为零(当然了,也是困扰了N周以后痛苦得出的结论),那LIVE555真的给了我一条出路,它是一个代码规模非常合适,又非常强大的媒体解决方案(称之为方案是因为它功能非常的丰富)。有长一段时间,我想去弄懂它的源码,不过和网上的很多人一样,最后软下来了,毕竟,去把这么多东西揉在一起,框架会弄得很复杂,因为我们要把这些完全不同的东西不断一层一层的抽像,最后抽像成一样(哲学呀)。它结构复杂是我中断分析它原来的其中一个原因,但不是主要原因。它结构的复杂程度也没胡像很多人网上说的那样严重,如果你是一个C++的热忱爱好者,你反而会迷上这段代码,当然了,对C的爱好都来说,当然是一种折磨了。暂时把我自己归类在C++爱好者范畴吧,呵呵,我很欣赏这段原码。主要原因是我不希望被某一个库绑死。LIVE555是有编解码能力,但我更希望它只做服务器的工作。

     因此,最终后回来的老路上来,没有帮助,就得自己帮自己,从最基础的RFC看起。经过了N天(周)的英文,终于领会了如果在RTP承载MPEG数据包。在这个过程中很得到了一些LIVE555的帮助(通过对Ethereal捕捉的LIVE555数据包进行分析)。先把程序弄上来,原理性的以后有空再写,程序只有一个.cpp文件,在vs.net 2003下编译通过,播放的视频文件在http://www.cnitblog.com/Files/tinnal/ES流解释程序.rar  内,播放的客户端采用VLC,其下载地址为http://www.videolan.org/。选择打开网络串流,然后选择“UDP/RTP”端口,输入程序的输出端口1000,然后才运行程序,你将在VLC内看到测试的广播视频,IP不一样的话自己改改就行。其它所谓的原理性的,也就是看RFC 3350、RFC2550以及iso13818-2的一些重点地方。

   // MPEG2RTP.h
#include
<stdio.h>
#include
<stdlib.h>
#include
<conio.h>
#include
<string.h>

#include
<winsock2.h>
#include
<winsock2.h>


//#include "mem.h"

//<! Start code or other signal
#define PACK_STARTCODE                     (unsigned int)0x000001ba
#define SYSTEM_HEADER_STARTCODE     (unsigned int)0x000001bb
#define PICTURE_START_CODE               (unsigned int)0x00000100
#define GROUP_START_CODE            (unsigned int)0x000000B8
#define ISO_11172_ENDCODE             (unsigned int)0x000001b9
#define SEQUENCE_HEADER_CODE        (unsigned int)0x000001b3

#define PACKET_BUFFER_END            (unsigned int)0x00000000


#define MAX_RTP_PKT_LENGTH     1440
#define HEADER_LENGTH        16
#define DEST_IP                "192.168.0.98"
#define DEST_PORT            1000
#define MPA                    14 /*MPEG PAYLOAD TYPE */
#define MPV                    32

typedef
struct 
{
   
/* byte 0 */
    unsigned
char csrc_len:4;        /* expect 0 */
    unsigned
char extension:1;        /* expect 1, see RTP_OP below */
    unsigned
char padding:1;        /* expect 0 */
    unsigned
char version:2;        /* expect 2 */
   
/* byte 1 */
    unsigned
char payload:7;        /* RTP_PAYLOAD_RTSP */
    unsigned
char marker:1;        /* expect 1 */
   
/* bytes 2, 3 */
    unsigned
short seq_no;           
   
/* bytes 4-7 */
    unsigned 
long timestamp;       
   
/* bytes 8-11 */
    unsigned
long ssrc;            /* stream number is used here. */
}
RTP_FIXED_HEADER;

typedef
struct {
   
//byte 0
    unsigned char TR_high2:2;    /* Temporal Reference high 2 bits*/
    unsigned
char T:1;            /* video specific head extension flag */
    unsigned
char MBZ:5;        /* unused */
   
//byte1
    unsigned char TR_low8:8;    /* Temporal Reference low 8 bits*/
   
//byte3
    unsigned char P:3;            /* picture type; 1=I,2=P,3=B,4=D */
    unsigned
char E:1;         /* set if last byte of payload is slice end code */
    unsigned
char B:1;            /* set if start of payload is slice start code */   
    unsigned
char S:1;            /* sequence header present flag */
    unsigned
char N:1;            /* N bit; used in MPEG 2 */
    unsigned
char AN:1;        /* Active N bit */
   
//byte4
    unsigned char FFC:3;        /* forward_f_code */
    unsigned
char FFV:1;        /* full_pel_forward_vector */
    unsigned
char BFC:3;        /* backward_f_code */
    unsigned
char FBV:1;        /* full_pel_backward_vector */
}
MPEG_VID_SPECIFIC_HDR; /* 4 BYTES */


enum reading_status {
    SLICE_AGAIN,
    SLICE_BREAK,
    UNKNOWN,
    SLICE,
    SEQUENCE_HEADER,
    GROUP_START,
    PICTURE
    }
;

void validate_file();
float frame_rate(int buffer_index);
unsigned
int read_picture_type(int buffer_index);
unsigned
int read_FBV(int buffer_index);
unsigned
int read_BFC(int buffer_index);
unsigned
int read_FFV(int buffer_index);
unsigned
int read_FFC(int buffer_index);
unsigned
int extract_temporal_reference(int buffer_index);
unsigned
int find_next_start_code(unsigned int *buffer_index);
void reset_buffer_index(void);
BOOL InitWinsock();



//MPEG2RTP.cpp
    //这个程序主要用于RTP封装MPEG2数据的学习和测试,不作任何其它用途
//软件在VS.net 2003中编译通过,但在linux下作小量修改也应编译通过。
//通过VLC测试,VLC能正确接收和解码由本程序发送的TEST.MPV编码流。
//
//作者:冯富秋 Tinnal
//邮箱:tinnal@163.com


#include
"MPEG2RTP.h"

#pragma   comment(lib,
"Ws2_32")

unsigned
char            buf[MAX_RTP_PKT_LENGTH + 4]; //input buffer
enum reading_status        state = SEQUENCE_HEADER;
unsigned
int            g_index_in_packet_buffer = HEADER_LENGTH;
static unsigned long    g_time_stamp = 0;
static unsigned long    g_time_stamp_current =0;
static float            g_frame_rate = 0;
static unsigned int        g_delay_time = 0;
static unsigned int        g_timetramp_increment = 0;
FILE   
*mpfd;
SOCKET    socket1;
RTP_FIXED_HEADER       
*rtp_hdr;
MPEG_VID_SPECIFIC_HDR   
*mpeg_hdr;

#if 0
void Send_RTP_Packet(unsigned char *buf,int bytes)
{

   
int i = 0;
   
int count = 0;

    printf(
"\nPacket length %d\n",bytes);
    printf(
"RTP Header: [M]:%s [sequence number]:0x%lx [timestamp]:0x%lx\n",
        rtp_hdr
->marker == 1?"TRUE":"FALSE",
        rtp_hdr
->seq_no,
        rtp_hdr
->timestamp);
    printf(
" [TR]:%d [AN]:%d [N]:%d [Sequence Header]:%s \
        \n [Begin Slice]:%s [End Slice]:%s \
        \n [Pictute Type]:
%d \
        \n [FBV]:
%d [BFC]:%d [FFV]:%d [FFC]:%d\n",
        (mpeg_hdr->TR_high2 << 8 | mpeg_hdr->TR_low8),
        mpeg_hdr
->AN, mpeg_hdr->N, mpeg_hdr->S == 1?"TRUE":"FALSE",
        mpeg_hdr
->B ==1?"TRUE":"FALSE", mpeg_hdr->E ==1?"TRUE":"FALSE",
        mpeg_hdr
->P,
        mpeg_hdr
->FBV, mpeg_hdr->BFC, mpeg_hdr->FFV, mpeg_hdr->FFC);

   
while(bytes --)
   
{
        printf(
"%02x ",buf[count++]);
       
if(++i == 16)
       
{
            i
=0;
            printf(
"\n");
        }

    }

    printf(
"\n");

}


#else

Send_RTP_Packet(unsigned
char *buf,int bytes)
{
   
return send( socket1,  (char*) buf, bytes, 0 );
}


#endif


void main(int argc, char *argv[])
{
    unsigned
int next_start_code;
    unsigned
int next_start_code_index;
    unsigned
int sent_bytes;
    unsigned
short seq_num =0;
    unsigned
short stream_num = 10;
   
struct sockaddr_in server;
   
int len =sizeof(server);


#if 0
    mpfd
= fopen("E:\\tinnal\\live555\\vc_proj\\es\\Debug\\test.mpv", "rb"); 
#else
   
if (argc < 2)
   
{
        printf(
"\nUSAGE: %s mpegfile\nExiting..\n\n",argv[0]);
                exit(
0);
    }

    mpfd
= fopen(argv[1], "rb");
#endif



   
if (mpfd == NULL )
   
{
        printf(
"\nERROR: could not open input file %s\n\n",argv[1]);
        exit(
0);
    }

    rtp_hdr
= (RTP_FIXED_HEADER*)&buf[0];
    mpeg_hdr
= (MPEG_VID_SPECIFIC_HDR*)&buf[12];

    memset((
void *)rtp_hdr,0,12); //zero-out the rtp fixed hdr
    memset((void *)mpeg_hdr,0,4); //zero-out the video specific hdr
    memset((void *)buf,0,MAX_RTP_PKT_LENGTH + 4);

    InitWinsock();

    server.sin_family
=AF_INET;
    server.sin_port
=htons(DEST_PORT);          //server的监听端口
    server.sin_addr.s_addr=inet_addr(DEST_IP); //server的地址

    socket1
=socket(AF_INET,SOCK_DGRAM,0);
    connect(socket1, (
const sockaddr *)&server, len) ;

   
//read the first packet from the mpeg file
   
//always read 4 extra bytes in (in case there's a startcode there)
   
//but dont send  more than MAX_RTP_PKT_LENGTH in one packet
    fread(&(buf[HEADER_LENGTH]), MAX_RTP_PKT_LENGTH-HEADER_LENGTH+4, 1,mpfd);

    validate_file();

   
do
   
{   

       
/* initialization of the two RTP headers */
        rtp_hdr
->seq_no     = htons(seq_num ++);
        rtp_hdr
->payload     = MPV;
        rtp_hdr
->version     = 2;
        rtp_hdr
->marker    = 0;
        rtp_hdr
->ssrc        = htonl(stream_num);   

        mpeg_hdr
->S = mpeg_hdr->E = mpeg_hdr->B= 0;

       
do{
            next_start_code
= find_next_start_code(&next_start_code_index);


           
if ((next_start_code >0x100) && (next_start_code<0x1b0) )
           
{
               
//<! We reach the first slice start code in current packet buffer.
               
//<! Set the B flag of the mpeg special header
                if(state == SEQUENCE_HEADER
                   
|| state ==GROUP_START
                   
|| state ==PICTURE
                   
|| state == UNKNOWN)
               
{
                    state
= SLICE;
                    mpeg_hdr
->B = 1;
                }

               
//<! We reach slice start code in current packet again.
               
//<! Set the E flag of the mpeg special header,
               
//<! and update the sent_bytes to the last slice data end.
                else if (state == SLICE ||state == SLICE_AGAIN)
               
{

                    state
= SLICE_AGAIN;
                    sent_bytes
= next_start_code_index;
                    mpeg_hdr
->E     = 1;
                }

               
//<! We reach slice start code(the previous slice end)
               
//<! for a broken slice. set the E flag.
               
//<! According to RFC2550, we shouldn't put another slice data to this packet,
               
//<! instead of sent it out.
                else if (state == SLICE_BREAK)
               
{
                    state
= UNKNOWN;
                    sent_bytes
= next_start_code_index;
                    mpeg_hdr
->E     = 1;
                   
goto Sent_Packet;
                }


            }
 

           
switch(next_start_code)
           
{
           
case SEQUENCE_HEADER_CODE:
               
//<! SEQUENCE_HEADER_CODE after SLICE_START_CODE
               
//<! we must sent the packet now, so that, the SEQUENCE_HEADER_CODE
               
//<! will appear at the start of the next packet
                if(state == SLICE || state == SLICE_AGAIN)
               
{               
                    state
= SEQUENCE_HEADER;
                    sent_bytes
= next_start_code_index;
                   
//<! Accord to RFC 2550,
                   
//<! at the end of a frame we should set RTP marker bit to 1.
                    rtp_hdr->marker = 1;
                   
goto Sent_Packet;
                }


                state
= SEQUENCE_HEADER;
                g_frame_rate
= frame_rate(next_start_code_index);
                g_delay_time
= (unsigned int)(1000.0 / g_frame_rate +0.5); //ms
                g_timetramp_increment = (unsigned int)(90000.0 / g_frame_rate +0.5); //90K Hz
                mpeg_hdr->S=1;
               
break;

           
case GROUP_START_CODE:
               
//<! GROUP_START_CODE after SLICE_START_CODE
               
//<! we must sent the packet now, so that, the GROUP_START_CODE
               
//<! will appear at the start of the next packet
                if(state == SLICE || state == SLICE_AGAIN)
               
{
                    state
= GROUP_START;
                    sent_bytes
= next_start_code_index;
                   
//<! Accord to RFC 2550,
                   
//<! at the end of a frame we should set RTP marker bit to 1.
                    rtp_hdr->marker = 1;
                   
goto Sent_Packet;
                }
   

                state
= GROUP_START;

           
case PICTURE_START_CODE:
               
//<! PICTURE_START_CODE after PICTURE_START_CODE
               
//<! we must sent the packet now, so that, the PICTURE_START_CODE
               
//<! will appear at the start of the next packet
                if(state == SLICE || state == SLICE_AGAIN)
               
{
                    state
= PICTURE;
                    sent_bytes
= next_start_code_index;
                   
//<! Accord to RFC 2550,
                   
//<! at the end of a frame we should set RTP marker bit to 1.
                    rtp_hdr->marker = 1;
                   
goto Sent_Packet;
                }


                state
= PICTURE;

                mpeg_hdr
->TR_high2    = (extract_temporal_reference(next_start_code_index) & 0x300 )>> 8;
                mpeg_hdr
->TR_low8     =  extract_temporal_reference(next_start_code_index) & 0xff;
                mpeg_hdr
->P             = read_picture_type(next_start_code_index);
               
//now read the motion vectors information
                if( (mpeg_hdr->P==2) || (mpeg_hdr->P==3))
               
{ //if B- or P-type picture, need forward mv
                    mpeg_hdr->FFV = read_FFV(next_start_code_index);
                    mpeg_hdr
->FFC = read_FFC(next_start_code_index);
                }

               
if( mpeg_hdr->P==3)
               
{ // if B-type pictue, need backward mv
                    mpeg_hdr->FBV = read_FBV(next_start_code_index);
                    mpeg_hdr
->BFC = read_BFC(next_start_code_index);
                }


               
//<! Time stamp only increate per frame.
               
//<! But I or P frame.
                if( mpeg_hdr->P== 1 || mpeg_hdr->P == 2 ){
                    g_time_stamp
+= g_timetramp_increment;
                    g_time_stamp_current
= g_time_stamp;
                }
else{
                    g_time_stamp
+= g_timetramp_increment;
                }

               

               
break;

           
case PACKET_BUFFER_END:
               
//<! There is one more slice in the packet buffer
               
//<! Anyway, we only sent the integrated slice
                if(state == SLICE_AGAIN) {
                    state
= UNKNOWN;
                   
goto Sent_Packet;
                }


               
//<! There is one Slice in the packet buffer.
               
//<! But the Slice is to big, so we break the slice.
                if(state == SLICE)
               
{
                    state
= SLICE_BREAK;
                    sent_bytes
= next_start_code_index;
                   
goto Sent_Packet;
                }


               
//<! There if a broke slice, but in current packet buffer
               
//<! we could not find the end of the slice.
               
//<! Let it in the broke state.
                if(state == SLICE_BREAK )
               
{
                    state
= SLICE_BREAK;
                    sent_bytes
= next_start_code_index;
                   
goto Sent_Packet;
                }


               
break;
            }

        }
while(next_start_code != PACKET_BUFFER_END);

Sent_Packet:
        rtp_hdr
->timestamp = htonl(g_time_stamp_current);
        Send_RTP_Packet(buf, sent_bytes);
       
       
//copy the tail data to the head of the packet buffer
        memmove(&buf[HEADER_LENGTH], &buf[sent_bytes], MAX_RTP_PKT_LENGTH-sent_bytes);
       
//reset the buffer index to zero
        reset_buffer_index();
       
//reading data into buffer again
        fread(&(buf[(MAX_RTP_PKT_LENGTH-sent_bytes)+HEADER_LENGTH]), sent_bytes -HEADER_LENGTH , 1,mpfd);

       
// sleep g_delay_time msec for sending next picture data
        if(rtp_hdr->marker ==1) Sleep( g_delay_time );

    }
while(!feof(mpfd));
    closesocket(socket1);
    fclose(mpfd);

    printf(
"stream end.\n");
}


//==================================================================

unsigned
int find_next_start_code(unsigned int *next_start_code_index) //NOTE: all start codes ARE byte-aligned
{
    unsigned
int byte0=0,byte1=0,byte2=0,byte3=0,startcode=0;

   
//while not startcode and have not exceeded max packet length
    while (g_index_in_packet_buffer < MAX_RTP_PKT_LENGTH)
   
{
       
if (buf[g_index_in_packet_buffer+0] == 0
           
&& buf[g_index_in_packet_buffer+1] == 0
           
&& buf[g_index_in_packet_buffer+2] ==1)
       
{
           
//printf("FOUND startcode %d\n",indx);
            byte0=(int)buf[g_index_in_packet_buffer+0];
            byte1
=(int)buf[g_index_in_packet_buffer+1];
            byte2
=(int)buf[g_index_in_packet_buffer+2];
            byte3
=(int)buf[g_index_in_packet_buffer+3];
            startcode
=(byte0 << 24) + (byte1 << 16) + (byte2 << 8) + byte3;
           
*next_start_code_index = g_index_in_packet_buffer;
            g_index_in_packet_buffer
= g_index_in_packet_buffer+4;
           
return(startcode);
        }

       
else
            g_index_in_packet_buffer
++;
    }


   
//<! reach the end of the packet buffer
    if (g_index_in_packet_buffer >= (MAX_RTP_PKT_LENGTH))
   
{
       
*next_start_code_index = g_index_in_packet_buffer -1;
        g_index_in_packet_buffer
= HEADER_LENGTH;
       
return PACKET_BUFFER_END;
    }


    printf(
"Error reading buffer..\n");
    exit(
-1);
   
return -1;
}


void reset_buffer_index(void)
{
    g_index_in_packet_buffer
= HEADER_LENGTH;
}




//========================================================
float frame_rate(int buffer_index)
{
    unsigned
char frame_rate_code;
    frame_rate_code
= (unsigned char)buf[buffer_index +7] & 0xf;
   
switch(frame_rate_code)
   
{
   
case 0x1:
       
return 23.976;
   
case 0x2:
       
return 24.0;
   
case 0x3:
       
return 25.0;
   
case 0x4:
       
return 29.97;
   
case 0x5:
       
return 30.0;
   
case 0x6:
       
return 50.0;
   
case 0x7:
       
return 59.94;
   
case 0x8:
       
return 60.0;
   
default:
       
return 0;
    }

}

//========================================================
unsigned int extract_temporal_reference(int buffer_index) // 10 bits
{
    unsigned
int low2bits=0,TR=0; // TR = temporal reference;

    TR
= (unsigned int) (buf[buffer_index+4]);
    TR
<<= 2;
    low2bits
= (unsigned int) (buf[buffer_index+5]);
    TR
|= (low2bits >> 6);
   
return(TR);
}


//========================================================

unsigned
int read_picture_type(int buffer_index)
{
    unsigned
int pictype=0;

    pictype
= (unsigned int) buf[buffer_index+5];
    pictype
= (pictype >> 3) & (0x7);
   
return (pictype);
}


//=======================================================
unsigned int read_FFV(int buffer_index) // 1 bit
{
   
return( (int) ((buf[buffer_index+7] & (0x4)) >> 2));
}

//=======================================================
unsigned int read_FFC(int buffer_index) // 3 bits
{
    unsigned
int FFC=0,lowbit=0;
    FFC
= (int) (buf[buffer_index+7] & (0x3));
    FFC
<<= 1;
    lowbit
= (int) ((buf[buffer_index+8]) & (0x80));
    FFC
= FFC | (lowbit >> 7 );
   
return(FFC);
}


//=======================================================
unsigned int read_FBV(int buffer_index) // 1 bit
{      
   
return( (int) ((buf[buffer_index+8] & (0x40))>>6) );
}


//=======================================================
unsigned int read_BFC(int buffer_index) // 3 bits
{               
   
return( (int) ( (buf[buffer_index+8] & (0x38) ) >> 3 ) );
}


void validate_file()
{
   
/* to validate the file, ensure the existance of a startcode */
   
int j=0,valid=0;

   
while ((j++<MAX_RTP_PKT_LENGTH) && (!valid))
   
{
       
if (!((int)buf[j+0] + (int)buf[j+1]) && (((int)buf[j+2])==1))
            valid
=1;
    }

   
if (!valid)
   
{
        printf(
"\nERROR: start code not found. \
               \nInput file must be a valid MPEG I file.\n");
        exit(0);
    }
          
}


BOOL InitWinsock()
{
   
int Error;
    WORD VersionRequested;
    WSADATA WsaData;
    VersionRequested
=MAKEWORD(2,2);
    Error
=WSAStartup(VersionRequested,&WsaData); //启动WinSock2
    if(Error!=0)
   
{
       
return FALSE;
    }

   
else
   
{
       
if(LOBYTE(WsaData.wVersion)!=2||HIBYTE(WsaData.wHighVersion)!=2)
       
{
            WSACleanup();
           
return FALSE;
        }

       
    }

   
return TRUE;
}

 

      完成这个测试程序后,我有了很大的信心,又重复看了RFC3550几编,其实,如果你真看了程序,你发现我只发送了RTP,并没有发送RTCP数据包,因此,我们是不能同步多个RTP流的。我没去编码下去,因为我觉得已经够了。这里强调,没用说的RTP没有了RTCP就不行!接下来的工作,就是把这个程序的下层发包函数去掉,采用RTP库JRTPLIB,我觉得这才应该是JRTPLIB的DEMO!如果有人问,就这样的一个程序就能完成任务了,要JRTPLIB干嘛,其实,我不写RTCP相关代码的原因为多个:

    1.RTCP里头有很多关于RTCP发送简隔的时间计算,RTP信息的统计,这种操作不是难,而是烦,我不想去写
    2.RTCP和RTP一开始出来的时候并不是因为视频的点播等应用的,而是视频会议。RTCP有管理与会者的层面含义,这一功能在很多场合并不会用到。
    3.我想简单,没有写多个流间的同步,如一个影片的视频和音频流。这些其实是RTCP来完成的。

    我懒得去写,因为这些功作RTP的各个库类都做得很好。我觉得用库的最大优点就在这吧。

Feedback

# re: RTP - 视频流广播  回复  更多评论   

2008-12-26 13:14 by zhouchao
能把该代码的完整工程文件给我么?我用此代码编译不过,感激不尽。zhouchaoyf@yahoo.com.cn

# re: RTP - 视频流广播  回复  更多评论   

2008-12-30 22:52 by 猫头鹰
完整代码已经给出来了呀。
http://www.cnitblog.com/Files/tinnal/ES流解释程序.rar
代码在VS2003下编译通过。
如果还有什么问题,可能发邮件给我。

# re: RTP - 视频流广播  回复  更多评论   

2013-02-26 10:22 by lightyear
楼主真是厉害,不过我想细问一个问题;
针对视频会议而言,到底是使用的那种协议?
A SCTP
B RTSP 和 RTP
C RTCP 和 RTP

# re: RTP - 视频流广播  回复  更多评论   

2015-04-13 10:06 by 爱自在
编译通过了。不过视频太短,看不到播放过程。能不能再发个长一点的。我也尝试下格式转换出来一个。还没转成功。
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