转自: http://www.devdiv.com/iOS_iPhone-_rtp_-thread-118648-1-1.html
ios没有直接得api用来封装传输rtp,但是经常有用到得接收过来得音视频数据,经过X264处理转换便可以封装为Rtp包进行直接发送。大家可以看代码:
- #include "rtpsession.h"
- #include "rtppacket.h"
- #include "rtpudpv4transmitter.h"
- #include "rtpipv4address.h"
- #include "rtpsessionparams.h"
- #include "rtperrors.h"
- @interface VideoRTPPack : NSObject<SocketHandlerDelegate>
- {
- RTPSession m_RTPSession;
-
- NSMutableDictionary *dicDataBuffer;
- }
- @property(nonatomic, retain) NSMutableDictionary *dicDataBuffer;
- - (id)initWithVideoRTP:(NSString *)hostIP onPort:(unsigned short)port;
- - (void)createVideoRTP:(NSString *)host onPort:(unsigned short)port;
- - (void)SendVideoPacket:(unsigned char*)videoData
- Nal:(int)_nal
- Size:(size_t)videoDataSize
- User:(unsigned long)user_id
- FrameID:(int)video_frame_id;
- - (void)resendSubPacketData:(int)frameID withSubPack:(int)packID;
- - (void)closeVideoRTP;
- @end
- #import "VideoRTPPack.h"
- @implementation VideoRTPPack
- @synthesize dicDataBuffer;
- - (id)initWithVideoRTP:(NSString *)hostIP onPort:(unsigned short)port
- {
- if (self = [super init])
- {
- [self createVideoRTP:hostIP onPort:port];
-
- dicDataBuffer = [[NSMutableDictionary alloc] init];
- }
-
- return self;
- }
- - (void)dealloc
- {
- KLC_RELEASE_SAFELY(self.dicDataBuffer)
-
- [super dealloc];
- }
- - (void)createVideoRTP:(NSString *)host onPort:(unsigned short)port
- {
- RTPUDPv4TransmissionParams m_VideoTransparams;
- RTPSessionParams m_VideoSessionparams;
-
- m_VideoSessionparams.SetOwnTimestampUnit(1.0/10.0);
- m_VideoSessionparams.SetAcceptOwnPackets(TRUE);
- m_VideoSessionparams.SetUsePollThread(0);
- m_VideoTransparams.SetPortbase(port);
-
- int nStatus = m_RTPSession.Create(m_VideoSessionparams, &m_VideoTransparams);
- if(nStatus < 0)
- {
- NSLog(@"create rtp faild!");
- return;
- }
-
- unsigned long ipAddress = ntohl(inet_addr([host UTF8String]));
-
- RTPIPv4Address JRTPVideoAddr(ipAddress, port);
- nStatus = m_RTPSession.AddDestination(JRTPVideoAddr);
- if(nStatus < 0)
- {
- NSLog(@"add destination faild!");
- return;
- }
-
- m_RTPSession.SetDefaultPayloadType(96);
- m_RTPSession.SetDefaultMark(FALSE);
- m_RTPSession.SetDefaultTimestampIncrement(160);
- }
- - (void)SendVideoPacket:(unsigned char*)videoData
- Nal:(int)_nal
- Size:(size_t)videoDataSize
- User:(unsigned long)user_id
- FrameID:(int)video_frame_id
- {
- NSLog(@"video_frame_id = %d", video_frame_id);
-
- unsigned short length = 0;
- int subPackIndex = 1;
- int i_video_loop = 0, offset = 0, video_pack_len = 0;
- NSMutableArray *subPackArray = [[NSMutableArray alloc] init];
-
- MSQ_PACK_MID msq_pack_mid;
- strcpy(msq_pack_mid.msq_head.AppName, GAppName);
- msq_pack_mid.msq_head.sTransType = htons(TRANSTYPE_CLIENTTOSERVER);
- msq_pack_mid.msq_head.sDataType = htons(SENDSTREAM_VIDEO_DATATYPE);
- msq_pack_mid.msq_head.lSendID = htonl(user_id);
-
- i_video_loop = videoDataSize / VIDEO_PACKET_SIZE;
- if ((videoDataSize % VIDEO_PACKET_SIZE) > 0) i_video_loop ++;
-
- while (videoDataSize)
- {
- VideoPacket *pVideoPacket = (VideoPacket*)msq_pack_mid.msq_data;
-
- pVideoPacket->PacketHead.TotalPackets = i_video_loop;
- pVideoPacket->PacketHead.subpacketindex = subPackIndex;
- pVideoPacket->PacketHead.sOffset = htons(offset);
-
- video_pack_len = (videoDataSize < VIDEO_PACKET_SIZE) ? videoDataSize:VIDEO_PACKET_SIZE;
- pVideoPacket->PacketHead.sDataLength = htons(video_pack_len);
- videoDataSize = videoDataSize - video_pack_len;
-
- pVideoPacket->PacketHead.lFrameID = htonl(video_frame_id);
- pVideoPacket->PacketHead.timeStart = 0;
- pVideoPacket->PacketHead.timeEnd = 0;
- pVideoPacket->PacketHead.s_nal = _nal;
-
- memcpy(pVideoPacket->rawData, videoData+offset, video_pack_len);
- offset = offset + video_pack_len;
-
- length = sizeof(VideoPacketHead) + video_pack_len;
-
- msq_pack_mid.msq_head.sTCPLength = htons(length);
- msq_pack_mid.msq_head.sDataLength = msq_pack_mid.msq_head.sTCPLength;
-
- NSData *subData = [NSData dataWithBytes:(void *)&msq_pack_mid length:sizeof(MSQ_HEAD)+length];
- [subPackArray addObject:subData];
-
- m_RTPSession.SendPacket(&msq_pack_mid, sizeof(MSQ_HEAD)+length);
-
- subPackIndex ++;
- }
-
- // 把视频数据存入缓冲区
- if ([[self.dicDataBuffer allKeys] count] < 50)
- {
- [self.dicDataBuffer setObject:subPackArray
- forKey:[NSNumber numberWithInt:video_frame_id]];
- }
- else
- {
- [self.dicDataBuffer removeObjectForKey:[NSNumber numberWithInt:video_frame_id-51]];
- [self.dicDataBuffer setObject:subPackArray
- forKey:[NSNumber numberWithInt:video_frame_id]];
- }
-
- KLC_RELEASE_SAFELY(subPackArray)
- }
- - (void)resendSubPacketData:(int)frameID withSubPack:(int)packID
- {
- NSArray *lostArray = (NSArray *)[self.dicDataBuffer objectForKey:[NSNumber numberWithInt:frameID]];
- NSData *lostData = [lostArray objectAtIndex:packID-1];
-
- int nStatus = m_RTPSession.SendPacket([lostData bytes], [lostData length]);
- if (nStatus == 0) NSLog(@"ReSend Packet Data Succeed!");
- }
- - (void)closeVideoRTP
- {
- if (m_RTPSession.IsActive())
- {
- m_RTPSession.Destroy();
- }
- }
- @end