直接上代碼。
參考：https://blog.csdn.net/weixin_42462202/category_9293806.html
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "rtp.h"
#define AAC_FILE_NAME "test.aac"
#define CLIENT_IP "10.14.33.103"
#define CLIENT_PORT 9832
#define BUF_MAX_SIZE (1024*1024)
#define SERVER_RTP_PORT 55532
#define SERVER_RTCP_PORT 55533
#define SERVER_PORT 8554
#define HDR_CSEQ "CSeq"
#define HDR_RANGE "Range"
#define HDR_SESSION "Session"
#define HDR_TRANSPORT "Transport"
#define RTSP_METHOD_OPTIONS "OPTIONS"
#define RTSP_METHOD_DESCRIBE "DESCRIBE"
#define RTSP_METHOD_SETUP "SETUP"
#define RTSP_METHOD_PLAY "PLAY"
typedef struct _RTSP_HDR_PARAM_
{
unsigned int rtsp_cseq;
unsigned int rtsp_session;
unsigned int rtsp_clientRtpPort;
unsigned int rtsp_clientRtcpPort;
unsigned char rtsp_method[20];
char rtsp_InBuffer[BUF_MAX_SIZE]; /*接收緩衝區*/
char rtsp_OutBuffer[BUF_MAX_SIZE];/*發送緩衝區*/
}RTSP_HDR_PARAM;
static int createTcpSocket()
{
int sockfd;
int on = 1;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0)
return -1;
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on));
return sockfd;
}
static int createUdpSocket()
{
int sockfd;
int on = 1;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if(sockfd < 0)
return -1;
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on));
return sockfd;
}
static int bindSocketAddr(int sockfd, const char* ip, int port)
{
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = inet_addr(ip);
if(bind(sockfd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) < 0)
return -1;
return 0;
}
static int acceptClient(int sockfd, char* ip, int* port)
{
int clientfd;
socklen_t len = 0;
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
len = sizeof(addr);
clientfd = accept(sockfd, (struct sockaddr *)&addr, &len);
if(clientfd < 0)
return -1;
strcpy(ip, inet_ntoa(addr.sin_addr));
*port = ntohs(addr.sin_port);
return clientfd;
}
struct AdtsHeader
{
unsigned int syncword; //12 bit 同步字 '1111 1111 1111'，說明一個ADTS幀的開始
unsigned int id; //1 bit MPEG 標示符， 0 for MPEG-4，1 for MPEG-2
unsigned int layer; //2 bit 總是'00'
unsigned int protectionAbsent; //1 bit 1表示沒有crc，0表示有crc
unsigned int profile; //1 bit 表示使用哪個級別的AAC
unsigned int samplingFreqIndex; //4 bit 表示使用的採樣頻率
unsigned int privateBit; //1 bit
unsigned int channelCfg; //3 bit 表示聲道數
unsigned int originalCopy; //1 bit
unsigned int home; //1 bit
/*下面的爲改變的參數即每一幀都不同*/
unsigned int copyrightIdentificationBit; //1 bit
unsigned int copyrightIdentificationStart; //1 bit
unsigned int aacFrameLength; //13 bit 一個ADTS幀的長度包括ADTS頭和AAC原始流
unsigned int adtsBufferFullness; //11 bit 0x7FF 說明是碼率可變的碼流
/* number_of_raw_data_blocks_in_frame
* 表示ADTS幀中有number_of_raw_data_blocks_in_frame + 1個AAC原始幀
* 所以說number_of_raw_data_blocks_in_frame == 0
* 表示說ADTS幀中有一個AAC數據塊並不是說沒有。(一個AAC原始幀包含一段時間內1024個採樣及相關數據)
*/
unsigned int numberOfRawDataBlockInFrame; //2 bit
};
static int parseAdtsHeader(uint8_t* in, struct AdtsHeader* res)
{
static int frame_number = 0;
memset(res,0,sizeof(*res));
if ((in[0] == 0xFF)&&((in[1] & 0xF0) == 0xF0))
{
res->id = ((unsigned int) in[1] & 0x08) >> 3;
res->layer = ((unsigned int) in[1] & 0x06) >> 1;
res->protectionAbsent = (unsigned int) in[1] & 0x01;
res->profile = ((unsigned int) in[2] & 0xc0) >> 6;
res->samplingFreqIndex = ((unsigned int) in[2] & 0x3c) >> 2;
res->privateBit = ((unsigned int) in[2] & 0x02) >> 1;
res->channelCfg = ((((unsigned int) in[2] & 0x01) << 2) | (((unsigned int) in[3] & 0xc0) >> 6));
res->originalCopy = ((unsigned int) in[3] & 0x20) >> 5;
res->home = ((unsigned int) in[3] & 0x10) >> 4;
res->copyrightIdentificationBit = ((unsigned int) in[3] & 0x08) >> 3;
res->copyrightIdentificationStart = (unsigned int) in[3] & 0x04 >> 2;
res->aacFrameLength = (((((unsigned int) in[3]) & 0x03) << 11) |
(((unsigned int)in[4] & 0xFF) << 3) |
((unsigned int)in[5] & 0xE0) >> 5) ;
res->adtsBufferFullness = (((unsigned int) in[5] & 0x1f) << 6 |
((unsigned int) in[6] & 0xfc) >> 2);
res->numberOfRawDataBlockInFrame = ((unsigned int) in[6] & 0x03);
return 0;
}
else
{
printf("failed to parse adts header\n");
return -1;
}
}
static int rtpSendAACFrame(int socket, const char* ip, int16_t port,
struct RtpPacket* rtpPacket, uint8_t* frame, uint32_t frameSize)
{
int ret;
rtpPacket->payload[0] = 0x00;
rtpPacket->payload[1] = 0x10;
rtpPacket->payload[2] = (frameSize & 0x1FE0) >> 5; //高8位
rtpPacket->payload[3] = (frameSize & 0x1F) << 3; //低5位
memcpy(rtpPacket->payload+4, frame, frameSize);
ret = rtpSendPacket(socket, ip, port, rtpPacket, frameSize+4);
if(ret < 0)
{
printf("failed to send rtp packet\n");
return -1;
}
rtpPacket->rtpHeader.seq++;
/*
* 如果採樣頻率是44100
* 一般AAC每個1024個採樣爲一幀
* 所以一秒就有 44100 / 1024 = 43幀
* 時間增量就是 44100 / 43 = 1025
* 一幀的時間爲 1 / 43 = 23ms
*/
rtpPacket->rtpHeader.timestamp += 1025;
return 0;
}
static int RTSP_HandleMethodOPTIONS(RTSP_HDR_PARAM* pstRtspHdrParam)
{
sprintf(pstRtspHdrParam->rtsp_OutBuffer,
"RTSP/1.0 200 OK\r\n"
"CSeq: %d\r\n"
"Public: OPTIONS, DESCRIBE, SETUP, PLAY\r\n"
"\r\n",
pstRtspHdrParam->rtsp_cseq);
return 0;
}
static int RTSP_HandleMethodDESCRIBE(RTSP_HDR_PARAM* pstRtspHdrParam)
{
char sdp[500];
char localIp[100];
char url[255];
sscanf(pstRtspHdrParam->rtsp_InBuffer, "%*s %256s",url);
sscanf(pstRtspHdrParam->rtsp_InBuffer, "DESCRIBE rtsp://%[^:]:", localIp);
sprintf(sdp, "v=0\r\n"
"o=- 9%ld 1 IN IP4 %s\r\n"
"t=0 0\r\n"
"a=control:*\r\n"
"m=audio 0 RTP/AVP 97\r\n"
"a=rtpmap:97 mpeg4-generic/44100/2\r\n"
"a=fmtp:97 SizeLength=13;\r\n"
"a=control:track0\r\n",
time(NULL), localIp);
sprintf(pstRtspHdrParam->rtsp_OutBuffer,
"RTSP/1.0 200 OK\r\n"
"CSeq: %d\r\n"
"Content-Base: %s\r\n"
"Content-type: application/sdp\r\n"
"Content-length: %d\r\n\r\n"
"%s",
pstRtspHdrParam->rtsp_cseq,
url,
strlen(sdp),
sdp);
return 0;
}
static int RTSP_HandleMethodSETUP(RTSP_HDR_PARAM* pstRtspHdrParam)
{
char *p = NULL;
if((p = strstr(pstRtspHdrParam->rtsp_InBuffer,HDR_TRANSPORT)))
{
sscanf(p, "Transport: RTP/AVP;unicast;client_port=%d-%d\r\n",
&pstRtspHdrParam->rtsp_clientRtpPort, &pstRtspHdrParam->rtsp_clientRtcpPort);
}
sprintf(pstRtspHdrParam->rtsp_OutBuffer,
"RTSP/1.0 200 OK\r\n"
"CSeq: %d\r\n"
"Transport: RTP/AVP;unicast;client_port=%d-%d;server_port=%d-%d\r\n"
"Session: 66334873\r\n"
"\r\n",
pstRtspHdrParam->rtsp_cseq,
pstRtspHdrParam->rtsp_clientRtpPort,
pstRtspHdrParam->rtsp_clientRtcpPort,
SERVER_RTP_PORT,
SERVER_RTCP_PORT);
return 0;
}
static int RTSP_HandleMethodPLAY(RTSP_HDR_PARAM* pstRtspHdrParam)
{
sprintf(pstRtspHdrParam->rtsp_OutBuffer,
"RTSP/1.0 200 OK\r\n"
"CSeq: %d\r\n"
"Range: npt=0.000-\r\n"
"Session: 66334873; timeout=60\r\n"
"\r\n",
pstRtspHdrParam->rtsp_cseq);
return 0;
}
static int RTSP_HandleMethod(RTSP_HDR_PARAM* pstRtspHdrParam)
{
if(!strcmp(pstRtspHdrParam->rtsp_method,RTSP_METHOD_OPTIONS))
{
if(RTSP_HandleMethodOPTIONS(pstRtspHdrParam))
{
printf("failed to handle OPTIONS\n");
return -1;
}
}
else if(!strcmp(pstRtspHdrParam->rtsp_method,RTSP_METHOD_DESCRIBE))
{
if(RTSP_HandleMethodDESCRIBE(pstRtspHdrParam))
{
printf("failed to handle DESCRIBE\n");
return -1;
}
}
else if(!strcmp(pstRtspHdrParam->rtsp_method,RTSP_METHOD_SETUP))
{
if(RTSP_HandleMethodSETUP(pstRtspHdrParam))
{
printf("failed to handle SETUP\n");
return -1;
}
}
else if(!strcmp(pstRtspHdrParam->rtsp_method,RTSP_METHOD_PLAY))
{
if(RTSP_HandleMethodPLAY(pstRtspHdrParam))
{
printf("failed to handle PLAY\n");
return -1;
}
}
return 0;
}
/*
*OPTIONS rtsp://10.1.74.190:8554 RTSP/1.0
*CSeq: 2
*User-Agent: LibVLC/3.0.4 (LIVE555 Streaming Media v2016.11.28)
*
*DESCRIBE rtsp://10.1.74.190:8554 RTSP/1.0
*CSeq: 3
*User-Agent: LibVLC/3.0.4 (LIVE555 Streaming Media v2016.11.28)
*Accept: application/sdp
*
*
*SETUP rtsp://10.1.74.190:8554/track0 RTSP/1.0
*CSeq: 4
*User-Agent: LibVLC/3.0.4 (LIVE555 Streaming Media v2016.11.28)
*Transport: RTP/AVP;unicast;client_port=63244-63245
*
*PLAY rtsp://10.1.74.190:8554 RTSP/1.0
*CSeq: 5
*User-Agent: LibVLC/3.0.4 (LIVE555 Streaming Media v2016.11.28)
*Session: 66334873
*Range: npt=0.000-
*
*/
static void doClient(int clientSockfd, const char* clientIP, int clientPort,
int serverRtpSockfd, int serverRtcpSockfd)
{
int recvLen;
int iRet = -1;
char *p = NULL;
RTSP_HDR_PARAM stRtspHdrParam;
while(1)
{
recvLen = recv(clientSockfd, stRtspHdrParam.rtsp_InBuffer, BUF_MAX_SIZE, 0);
if(recvLen <= 0)
goto out;
stRtspHdrParam.rtsp_InBuffer[recvLen] = '\0';
printf("---------------C->S--------------\n");
printf("%s\n",stRtspHdrParam.rtsp_InBuffer);
if (!sscanf(stRtspHdrParam.rtsp_InBuffer, "%s",stRtspHdrParam.rtsp_method))
{
printf("prase url failed\n");
goto out;
}
if((p = strstr(stRtspHdrParam.rtsp_InBuffer,HDR_CSEQ)) != NULL)
{
if(!sscanf(p, "%*s %d",&stRtspHdrParam.rtsp_cseq))
{
printf("prase Cseq failed\n");
goto out;
}
}
iRet = RTSP_HandleMethod(&stRtspHdrParam);
if(iRet != 0)
{
printf("RTSP_HandleMethod failed\n");
goto out;
}
printf("---------------S->C--------------\n");
printf("%s\n",stRtspHdrParam.rtsp_OutBuffer);
send(clientSockfd, stRtspHdrParam.rtsp_OutBuffer, strlen(stRtspHdrParam.rtsp_OutBuffer), 0);
/* 開始播放，發送RTP包 */
if(!strcmp(stRtspHdrParam.rtsp_method,RTSP_METHOD_PLAY))
{
struct AdtsHeader adtsHeader;
struct RtpPacket* rtpPacket;
uint8_t* frame;
int ret;
int fd = open(AAC_FILE_NAME, O_RDONLY);
if(fd < 0)
{
printf("failed to open %s\n", AAC_FILE_NAME);
goto out;
}
frame = (uint8_t*)malloc(5000);
rtpPacket = malloc(5000);
rtpHeaderInit(rtpPacket, 0, 0, 0, RTP_VESION, RTP_PAYLOAD_TYPE_AAC, 1, 0, 0, 0x32411);
while(1)
{
ret = read(fd, frame, 7);
if(ret <= 0)
{
break;
}
if(parseAdtsHeader(frame, &adtsHeader) < 0)
{
printf("parse err\n");
break;
}
ret = read(fd, frame, adtsHeader.aacFrameLength-7);
if(ret < 0)
{
printf("read err\n");
break;
}
rtpSendAACFrame(serverRtpSockfd, clientIP, stRtspHdrParam.rtsp_clientRtpPort,
rtpPacket, frame, adtsHeader.aacFrameLength-7);
usleep(23000);
}
free(frame);
free(rtpPacket);
goto out;
}
}
out:
close(clientSockfd);
}
int main(int argc, char* argv[])
{
int serverSockfd;
int serverRtpSockfd, serverRtcpSockfd;
int ret;
/* 1. 創建TCP socket */
serverSockfd = createTcpSocket();
if(serverSockfd < 0)
{
printf("failed to create tcp socket\n");
return -1;
}
/* 2. 綁定TCP socket */
ret = bindSocketAddr(serverSockfd, "0.0.0.0", SERVER_PORT);
if(ret < 0)
{
printf("failed to bind addr\n");
return -1;
}
/* 3. 監聽 */
ret = listen(serverSockfd, 10);
if(ret < 0)
{
printf("failed to listen\n");
return -1;
}
/* 4. 創建UDP socket */
serverRtpSockfd = createUdpSocket();
serverRtcpSockfd = createUdpSocket();
if(serverRtpSockfd < 0 || serverRtcpSockfd < 0)
{
printf("failed to create udp socket\n");
return -1;
}
/* 5. 綁定UDP socket */
if(bindSocketAddr(serverRtpSockfd, "0.0.0.0", SERVER_RTP_PORT) < 0 ||
bindSocketAddr(serverRtcpSockfd, "0.0.0.0", SERVER_RTCP_PORT) < 0)
{
printf("failed to bind addr\n");
return -1;
}
while(1)
{
int clientSockfd;
char clientIp[40];
int clientPort;
clientSockfd = acceptClient(serverSockfd, clientIp, &clientPort);
if(clientSockfd < 0)
{
printf("failed to accept client\n");
return -1;
}
printf("accept client;client ip:%s,client port:%d\n", clientIp, clientPort);
doClient(clientSockfd, clientIp, clientPort, serverRtpSockfd, serverRtcpSockfd);
}
}