关于对H264码流的TS的封装的相关代码实现
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转自:http://www.cnblogs.com/lidabo/p/6604998.html
1 写在开始之前
在前段时间有分享一个H264封装ps流到相关文章的,这次和大家分享下将H264封装成TS流到相关实现,其实也是工作工作需要。依照上篇一样,分段说明每个数据头的封装情况,当然,一样也会加上rtp头,方便以后的这方面到需求,如果开发不需要的话,可 以自行屏蔽掉,当然需要主要buffer指针的移动情况
2 封装的各个头到规则要点
整个封装过程也是和ps类似,但是最大到区别在于TS流到数据长度都是固定188大小来传输的,而PS流则是可变包结构,正因为两者在结构上到差异,导致了它们在传输误码上的不同抵抗力.TS流由于采用了固定长度的数据包,当传输误码破坏了某一个TS包的同步信息时,接收端可在固定的位置检测到下一个TS包到同步信息,从而恢复同步,避免数据丢失,PS流则长度可变到数据包,当某一个ps包同步信息丢失时,接收端就无法进行信息同步,也就无法确认下一步到同步信息,导致了严重到信息丢失。因此在环境恶劣的情况下, 传输码丢失比较严重,一般都采用TS流来进行避免,当网络环境比较稳定,传输误码概率小,这个时候采用PS流进行传送。
关于TS流需要了解下节目映射表(PAT:Program Associate Table)以及节目映射表(PMT:Program Map Table),当发送到数据为视频数据关键帧的时候,需要在包头中添加PAT和PMT
具体结构体如下
封装组成:(PAT +PMT) + TS + PES + H264 + (TS + H264 + TS + H264 ....)
数据长度:PES包的长度=188字节-TS包头长度(4字节)-适应域长度(PES长度或者0)
注意:
a 每次数据定长包188个字节,如果不足的则用1填充,这里填充时值每一个bit位都填充,memset就是最好选择。
b 因为我个人习惯,在封装到时候当为关键帧的时候,我直接丢了PAM+PMT+TS+PES 然后填充满188个字节,这样做提醒大家 是错误到,完全错误的,PES后必须跟H264数据。
c PES能表示的数据长度只有short, 两个字节,所以当数据长度超过的话,则需要考虑多个PES头
3 各个部件到头的伪代码实现
- /*
- *@remark: 整体发送数据的抽象逻辑处理函数接口
- */
- int rtsp_RTPPackage( RTP_SESSION_S *pRtpSender, int nFrameLen, StreamType_E enStreamType)
- {
- int nRet = 0;
- int bVideo = 1 ;
- int nSendDataOff = 0;
- int nSendSize = 0;
- int nPayLoadSize = 0;
- int nHasSend = 0;
- int IFrameFlag = 0;
- char TSFrameHdr[1024];
- int nHead = 0;
- memset(TSFrameHdr, 0, 1024);
- memset(pRtpSender->stRtpPack, 0, RTP_MAX_PACKET_BUFF);
- bVideo = ((enStreamType == VIDEO_STREAM ) ? 1 : 0);
- // @remark: 判断数据是否为I帧,如果为I帧的话,加上PAT和PMT
- if( (bVideo == 1) && pRtpSender->stAvData.u8IFrame == 1)
- {
- if((nRet = mk_ts_pat_packet(TSFrameHdr +nSendDataOff,
- pRtpSender->hHdlTs)) <= 0)
- {
- DBG_INFO(" mk_ts_pat_packet failed!\\n");
- return -1;
- }
- // @remark: 每次添加一个头的时候,必须注意指针到偏移量
- nSendDataOff += nRet;
- if((nRet = mk_ts_pmt_packet(TSFrameHdr + nSendDataOff,
- pRtpSender->hHdlTs)) <= 0)
- {
- DBG_INFO(" mk_ts_pmt_packet failed!\\n");
- return -1;
- }
- nSendDataOff += nRet;
- }
- // @remark: 添加PS头,需要注意ps里也有一个计数的字段
- if((nRet = mk_ts_packet(TSFrameHdr + nSendDataOff, pRtpSender->hHdlTs,
- 1, bVideo, pRtpSender->stAvData.u8IFrame, pRtpSender->stAvData.u64TimeStamp)) <= 0 )
- {
- DBG_INFO(" mk_ts_packet failed!\\n");
- return -1;
- }
- nSendDataOff += nRet;
- //此字段是用来计算ts长度,因为ts包是固定188字节长度
- nHead = nRet;
- // @remark: 添加PES头,后面就必须接H264数据了,不能通过1来填充
- if((nRet = mk_pes_packet(TSFrameHdr + nSendDataOff, bVideo, nFrameLen, 1,
- pRtpSender->stAvData.u64TimeStamp, pRtpSender->stAvData.u64TimeStamp)) <= 0 )
- {
- DBG_INFO(" mk_pes_packet failed!\\n");
- return -1;
- }
- nSendDataOff += nRet;
- nHead += nRet;
- // @remark: 如果第一次发送的数据长度大于剩余长度,则先发送ts包剩余长度的数据
- if( nFrameLen > (TS_LOAD_LEN - nHead))
- {
- memcpy(TSFrameHdr + nSendDataOff, pRtpSender->stAvData.data, TS_LOAD_LEN - nHead);
- nSendDataOff += (TS_LOAD_LEN - nHead);
- nHasSend = (TS_LOAD_LEN - nHead);
- if( rtsp_send_rtppack(TSFrameHdr, &nSendDataOff, pRtpSender->stAvData.u64TimeStamp, 0, (pRtpSender->stAvData.u8IFrame?1:0), bVideo, 1, pRtpSender) != 0 )
- {
- DBG_INFO(" rtsp_send_pack failed!\\n");
- return -1;
- }
- }
- // @remark: 如果第一次发送数据长度小于ts头剩余长度,则,发送数据帧长度,剩余没有188长度的用1填充
- else
- {
- memcpy(TSFrameHdr + nSendDataOff, pRtpSender->stAvData.data, nFrameLen);
- nSendDataOff += nFrameLen;
- nHasSend = nFrameLen;
- memset(TSFrameHdr +nSendDataOff, 0xFF, (TS_LOAD_LEN-nHead - nFrameLen));
- nSendDataOff += (TS_LOAD_LEN -nHead- nFrameLen);
- if( rtsp_send_rtppack(TSFrameHdr, &nSendDataOff, pRtpSender->stAvData.u64TimeStamp, 1, (pRtpSender->stAvData.u8IFrame?1:0), bVideo, 1, pRtpSender) != 0 )
- {
- DBG_INFO(" rtsp_send_rtppack failed!\\n");
- return -1;
- }
- }
- // 对应的数据便宜长度,因为我处理的时候时固定1460到rtp包发送数据,所以这里会处理偏移,方便添加rtp头
- nPayLoadSize = RTP_MAX_PACKET_BUFF - 4 - RTP_HDR_LEN - (4+6) * 7; // 减去rtp头,ts头 ,一个rtp包最多7个ts包
- nFrameLen -= (TS_LOAD_LEN - nHead);
- // @remark: 第二次发送数据了,此时发送数据时候,就需要外再添加ps头了
- while(nFrameLen > 0 )
- {
- nSendSize = (nFrameLen > nPayLoadSize) ? nPayLoadSize : nFrameLen;
- if( rtsp_send_rtppack(pRtpSender->stAvData.data + nHasSend, &nSendSize, pRtpSender->stAvData.u64TimeStamp,
- ((nSendSize == nFrameLen) ? 1 : 0), IFrameFlag, bVideo, 0, pRtpSender) != 0 )
- {
- DBG_INFO(" rtsp_send_rtppack failed!\\n");
- return -1;
- }
- nFrameLen -= nSendSize;
- nHasSend += nSendSize;
- memset(pRtpSender->stRtpPack, 0, RTP_MAX_PACKET_BUFF);
- IFrameFlag = 0;
- }
- return 0;
- }
- /*
- *@remark : 添加pat头
- */
- int mk_ts_pat_packet(char *buf, int handle)
- {
- int nOffset = 0;
- int nRet = 0;
- if (!buf)
- {
- return 0;
- }
- if (0 >= (nRet = ts_header(buf, handle, TS_TYPE_PAT, 1)))
- {
- return 0;
- }
- nOffset += nRet;
- if (0 >= (nRet = ts_pointer_field(buf + nOffset)))
- {
- return 0;
- }
- nOffset += nRet;
- if (0 >= (nRet = ts_pat_header(buf + nOffset)))
- {
- return 0;
- }
- nOffset += nRet;
- // 每一个pat都会当成一个ts包来处理,所以每次剩余部分用1来充填完
- memset(buf + nOffset, 0xFF, TS_PACKET_SIZE - nOffset);
- return TS_PACKET_SIZE;
- }
- int ts_pat_header(char *buf)
- {
- BITS_BUFFER_S bits;
- if (!buf)
- {
- return 0;
- }
- bits_initwrite(&bits, 32, (unsigned char *)buf);
- bits_write(&bits, 8, 0x00); // table id, 固定为0x00
- bits_write(&bits, 1, 1); // section syntax indicator, 固定为1
- bits_write(&bits, 1, 0); // zero, 0
- bits_write(&bits, 2, 0x03); // reserved1, 固定为0x03
- bits_write(&bits, 12, 0x0D); // section length, 表示这个字节后面有用的字节数, 包括CRC32
- bits_write(&bits, 16, 0x0001); // transport stream id, 用来区别其他的TS流
- bits_write(&bits, 2, 0x03); // reserved2, 固定为0x03
- bits_write(&bits, 5, 0x00); // version number, 范围0-31
- bits_write(&bits, 1, 1); // current next indicator, 0 下一个表有效, 1当前传送的PAT表可以使用
- bits_write(&bits, 8, 0x00); // section number, PAT可能分为多段传输,第一段为00
- bits_write(&bits, 8, 0x00); // last section number
- bits_write(&bits, 16, 0x0001); // program number
- bits_write(&bits, 3, 0x07); // reserved3和pmt_pid是一组,共有几个频道由program number指示
- bits_write(&bits, 13, TS_PID_PMT); // pmt of pid in ts head
- bits_write(&bits, 8, 0x9F); // CRC_32 先暂时写死
- bits_write(&bits, 8, 0xC7);
- bits_write(&bits, 8, 0x62);
- bits_write(&bits, 8, 0x58);
- bits_align(&bits);
- return bits.i_data;
- }
- /*
- *@remaark: 添加PMT头
- */
- int mk_ts_pmt_packet(char *buf, int handle)
- {
- int nOffset = 0;
- int nRet = 0;
- if (!buf)
- {
- return 0;
- }
- if (0 >= (nRet = ts_header(buf, handle, TS_TYPE_PMT, 1)))
- {
- return 0;
- }
- nOffset += nRet;
- if (0 >= (nRet = ts_pointer_field(buf + nOffset)))
- {
- return 0;
- }
- nOffset += nRet;
- if (0 >= (nRet = ts_pmt_header(buf + nOffset)))
- {
- return 0;
- }
- nOffset += nRet;
- // 每一个pmt都会当成一个ts包来处理,所以每次剩余部分用1来充填完
- memset(buf + nOffset, 0xFF, TS_PACKET_SIZE - nOffset);
- return TS_PACKET_SIZE;
- }
- int ts_pmt_header(char *buf)
- {
- BITS_BUFFER_S bits;
- if (!buf)
- {
- return 0;
- }
- bits_initwrite(&bits, 32, (unsigned char *)buf);
- bits_write(&bits, 8, 0x02); // table id, 固定为0x02
- bits_write(&bits, 1, 1); // section syntax indicator, 固定为1
- bits_write(&bits, 1, 0); // zero, 0
- bits_write(&bits, 2, 0x03); // reserved1, 固定为0x03
- bits_write(&bits, 12, 0x1C); // section length, 表示这个字节后面有用的字节数, 包括CRC32
- bits_write(&bits, 16, 0x0001); // program number, 表示当前的PMT关联到的频道号码
- bits_write(&bits, 2, 0x03); // reserved2, 固定为0x03
- bits_write(&bits, 5, 0x00); // version number, 范围0-31
- bits_write(&bits, 1, 1); // current next indicator, 0 下一个表有效, 1当前传送的PAT表可以使用
- bits_write(&bits, 8, 0x00); // section number, PAT可能分为多段传输,第一段为00
- bits_write(&bits, 8, 0x00); // last section number
- bits_write(&bits, 3, 0x07); // reserved3, 固定为0x07
- bits_write(&bits, 13, TS_PID_VIDEO); // pcr of pid in ts head, 如果对于私有数据流的节目定义与PCR无关,这个域的值将为0x1FFF
- bits_write(&bits, 4, 0x0F); // reserved4, 固定为0x0F
- bits_write(&bits, 12, 0x00); // program info length, 前两位bit为00
- bits_write(&bits, 8, TS_PMT_STREAMTYPE_H264_VIDEO); // stream type, 标志是Video还是Audio还是其他数据
- bits_write(&bits, 3, 0x07); // reserved, 固定为0x07
- bits_write(&bits, 13, TS_PID_VIDEO); // elementary of pid in ts head
- bits_write(&bits, 4, 0x0F); // reserved, 固定为0x0F
- bits_write(&bits, 12, 0x00); // elementary stream info length, 前两位bit为00
- bits_write(&bits, 8, TS_PMT_STREAMTYPE_11172_AUDIO); // stream type, 标志是Video还是Audio还是其他数据
- bits_write(&bits, 3, 0x07); // reserved, 固定为0x07
- bits_write(&bits, 13, TS_PID_AUDIO); // elementary of pid in ts head
- bits_write(&bits, 4, 0x0F); // reserved, 固定为0x0F
- bits_write(&bits, 12, 0x00); // elementary stream info length, 前两位bit为00
- bits_write(&bits, 8, 0xA4); // stream type, 标志是Video还是Audio还是其他数据
- bits_write(&bits, 3, 0x07); // reserved, 固定为0x07
- bits_write(&bits, 13, 0x00A4); // elementary of pid in ts head
- bits_write(&bits, 4, 0x0F); // reserved, 固定为0x0F
- bits_write(&bits, 12, 0x00); // elementary stream info length, 前两位bit为00
- bits_write(&bits, 8, 0x34); //CRC_32 先暂时写死
- bits_write(&bits, 8, 0x12);
- bits_write(&bits, 8, 0xA3);
- bits_write(&bits, 8, 0x72);
- bits_align(&bits);
- return bits.i_data;
- }
- /*
- *@remark: ts头的封装
- */
- int mk_ts_packet(char *buf, int handle, int bStart, int bVideo, int bIFrame, unsigned long long timestamp)
- {
- int nOffset = 0;
- int nRet = 0;
- if (!buf)
- {
- return 0;
- }
- if (0 >= (nRet = ts_header(buf, handle, bVideo ? TS_TYPE_VIDEO : TS_TYPE_AUDIO, bStart)))
- {
- return 0;
- }
- nOffset += nRet;
- if (0 >= (nRet = ts_adaptation_field(buf + nOffset, bStart, bVideo && (bIFrame), timestamp)))
- {
- return 0;
- }
- nOffset += nRet;
- return nOffset;
- }
- /* *@remark: ts头相关封装
- * PSI 包括了PAT、PMT、NIT、CAT
- * PSI--Program Specific Information, PAT--program association table, PMT--program map table
- * NIT--network information table, CAT--Conditional Access Table
- * 一个网络中可以有多个TS流(用PAT中的ts_id区分)
- * 一个TS流中可以有多个频道(用PAT中的pnumber、pmt_pid区分)
- * 一个频道中可以有多个PES流(用PMT中的mpt_stream区分)
- */
- int ts_header(char *buf, int handle, TS_TYPE_E type, int bStart)
- {
- BITS_BUFFER_S bits;
- TS_MNG_S *pMng = (TS_MNG_S *)handle;
- if (!buf || !handle || TS_TYPE_BEGIN >= type || TS_TYPE_END <= type)
- {
- return 0;
- }
- bits_initwrite(&bits, 32, (unsigned char *)buf);
- bits_write(&bits, 8, 0x47); // sync_byte, 固定为0x47,表示后面的是一个TS分组
- // payload unit start indicator根据TS packet究竟是包含PES packet还是包含PSI data而设置不同值
- // 1. 若包含的是PES packet header, 设为1, 如果是PES packet余下内容, 则设为0
- // 2. 若包含的是PSI data, 设为1, 则payload的第一个byte将是point_field, 0则表示payload中没有point_field
- // 3. 若此TS packet为null packet, 此flag设为0
- bits_write(&bits, 1, 0); // transport error indicator
- bits_write(&bits, 1, bStart); // payload unit start indicator
- bits_write(&bits, 1, 0); // transport priority, 1表示高优先级
- if (TS_TYPE_PAT == type)
- {
- bits_write(&bits, 13, 0x00); // pid, 0x00 PAT, 0x01 CAT
- }
- else if (TS_TYPE_PMT == type)
- {
- bits_write(&bits, 13, TS_PID_PMT);
- }
- else if (TS_TYPE_VIDEO == type)
- {
- bits_write(&bits, 13, TS_PID_VIDEO);
- }
- else if (TS_TYPE_AUDIO == type)
- {
- bits_write(&bits, 13, TS_PID_AUDIO);
- }
- bits_write(&bits, 2, 0); // transport scrambling control, 传输加扰控制
- if (TS_TYPE_PAT == type || TS_TYPE_PMT == type)
- {
- // continuity counter, 是具有同一PID值的TS包之间的连续计数值
- // 当分组的adaption_field_control字段为00话10时,该字段不递增
- bits_write(&bits, 2, 0x01); // adaptation field control, 00 forbid, 01 have payload, 10 have adaptation, 11 have payload and adaptation
- bits_write(&bits, 4, pMng->nPatCounter); // continuity counter, 0~15
- if (TS_TYPE_PAT != type)
- {
- pMng->nPatCounter++;
- pMng->nPatCounter &= 0x0F;
- }
- }
- else
- {
- bits_write(&bits, 2, 0x03); // 第一位表示有无调整字段,第二位表示有无有效负载
- bits_write(&bits, 4, pMng->nContinuityCounter);
- pMng->nContinuityCounter++;
- pMng->nContinuityCounter &= 0x0F;
- }
- bits_align(&bits);
- return bits.i_data;
- }
- /*
- *remark:添加pes头
- */
- int mk_pes_packet(char *buf, int bVideo, int length, int bDtsEn, unsigned long long pts, unsigned long long dts)
- {
- PES_HEAD_S pesHead;
- PES_OPTION_S pesOption;
- PES_PTS_S pesPts;
- PES_PTS_S pesDts;
- if (!buf)
- {
- return 0;
- }
- if( bVideo == 1)
- {
- // 视频的采样频率为90kHZ,则增量为3600
- pts = pts * 9 / 100; // 90000Hz
- dts = dts * 9 / 100; // 90000Hz
- }
- else
- {
- // 音频的话,则需要按照8000HZ来计算增量[需要的话]
- pts = pts * 8 / 1000; // 8000Hz
- dts = dts * 8 / 1000; // 8000Hz
- }
- memset(&pesHead, 0, sizeof(pesHead));
- memset(&pesOption, 0, sizeof(pesOption));
- memset(&pesPts, 0, sizeof(pesPts));
- memset(&pesDts, 0, sizeof(pesDts));
- pesHead.startcode = htonl(0x000001) >> 8;
- pesHead.stream_id = bVideo ? 0xE0 : 0xC0;
- if (PES_MAX_SIZE < length)
- {
- pesHead.pack_len = 0;
- }
- else
- {
- pesHead.pack_len = htons(length + sizeof(pesOption) + sizeof(pesPts) + (bDtsEn ? sizeof(pesDts) : 0));
- }
- pesOption.fixed = 0x02;
- pesOption.pts_dts = bDtsEn ? 0x03 : 0x02;
- pesOption.head_len = sizeof(pesPts) + (bDtsEn ? sizeof(pesDts) : 0);
- pesPts.fixed2 = pesPts.fixed3 = pesPts.fixed4 = 0x01;
- pesPts.fixed1 = bDtsEn ? 0x03 : 0x02;
- pesPts.ts1 = (pts >> 30) & 0x07;
- pesPts.ts2 = (pts >> 22) & 0xFF;
- pesPts.ts3 = (pts >> 15) & 0x7F;
- pesPts.ts4 = (pts >> 7) & 0xFF;
- pesPts.ts5 = pts & 0x7F;
- pesDts.fixed1 = pesDts.fixed2 = pesDts.fixed3 = pesDts.fixed4 = 0x01;
- pesDts.ts1 = (dts >> 30) & 0x07;
- pesDts.ts2 = (dts >> 22) & 0xFF;
- pesDts.ts3 = (dts >> 15) & 0x7F;
- pesDts.ts4 = (dts >> 7) & 0xFF;
- pesDts.ts5 = dts & 0x7F;
- char *head = buf;
- memcpy(head, &pesHead, sizeof(pesHead));
- head += sizeof(pesHead);
- memcpy(head, &pesOption, sizeof(pesOption));
- head += sizeof(pesOption);
- memcpy(head, &pesPts, sizeof(pesPts));
- head += sizeof(pesPts);
- if (bDtsEn)
- {
- memcpy(head, &pesDts, sizeof(pesDts));
- head += sizeof(pesPts);
- }
- return (head - buf);
- }
- /*
- *@remark: 最后封装rtp头并发送最终封装好到完整的数据包
- */
- int rtsp_send_rtppack(char *Databuf, int *datalen, unsigned long curtimestamp, int mark_flag, int IFrameFlag, int bVideo, int nFrameStart, RTP_SESSION_S *pRtpSender)
- {
- int nHasSend = 0;
- int nRet = 0;
- int nTsHeadNum = 0;
- int nHadDataLen = 0;
- int nTcpSendLen = 0;
- static unsigned short cSeqnum;
- // @remark:表示为数据的第一次发送,所以不需要额外再添加ts头
- if( nFrameStart == 1 )
- {
- nRet = mk_rtp_packet(pRtpSender->stRtpPack + nHasSend, mark_flag, IFrameFlag, bVideo, ++cSeqnum, (curtimestamp * 9/100));
- nHasSend += nRet;
- memcpy(pRtpSender->stRtpPack + nHasSend, Databuf, *datalen);
- nHasSend += *datalen;
- }
- else // 不是第一次发送此帧数据的话,则需要添加封装新的ts包,并添加ts头
- {
- // rtp+ rtp_ext + ts +data
- nRet = mk_rtp_packet(pRtpSender->stRtpPack + nHasSend, mark_flag, IFrameFlag, bVideo, ++cSeqnum, (curtimestamp * 9/100));
- nHasSend += nRet;
- while(*datalen > 0 && nTsHeadNum < 7)
- {
- nRet = mk_ts_packet(pRtpSender->stRtpPack + nHasSend , pRtpSender->hHdlTs, 0, bVideo, (IFrameFlag > 0 ? 1:0), curtimestamp);
- nHasSend += nRet;
- if(*datalen < (TS_LOAD_LEN- nRet))
- {
- memcpy(pRtpSender->stRtpPack + nHasSend, Databuf + nHadDataLen, *datalen);
- nHasSend += *datalen;
- nHadDataLen += *datalen;
- //不够Ts188用1补充
- memset(pRtpSender->stRtpPack + nHasSend, 0xFF, TS_LOAD_LEN- nRet - (*datalen));
- nHasSend += (TS_LOAD_LEN - nRet - *datalen);
- }
- else
- {
- memcpy(pRtpSender->stRtpPack + nHasSend, Databuf + nHadDataLen, TS_LOAD_LEN - nRet);
- nHasSend += (TS_LOAD_LEN - nRet);
- *datalen -= (TS_LOAD_LEN - nRet);
- nHadDataLen += (TS_LOAD_LEN - nRet);
- }
- nTsHeadNum ++;
- }
- *datalen = nHadDataLen; //实际发送裸数据到长度
- }
- if(pRtpSender->RtspsockFd <= 0 )
- {
- DBG_INFO("send rtp packet socket error\\n");
- return -1;
- }
- nTcpSendLen = hi_tcp_noblock_send(pRtpSender->RtspsockFd, pRtpSender->stRtpPack, nHasSend, NULL,1500);
- if(nTcpSendLen != nHasSend )
- {
- DBG_INFO("send rtp packet failed:%s\\n",strerror(errno));
- return -1;
- }
- return 0;
- }
- /*
- *remark: 上面用到的一些宏定义和一些关于字节操作的函数,很多一些开源到视频处理的库都能看到,
- 为了方便也都将贴出来分享,当然也可以参考下vlc里面的源码
- */
- /*@remark: 常量定义 */
- #define TS_PID_PMT (0x62)
- #define TS_PID_VIDEO (0x65)
- #define TS_PID_AUDIO (0x84)
- #define TS_PMT_STREAMTYPE_11172_AUDIO (0x03)
- #define TS_PMT_STREAMTYPE_13818_AUDIO (0x04)
- #define TS_PMT_STREAMTYPE_AAC_AUDIO (0x0F)
- #define TS_PMT_STREAMTYPE_H264_VIDEO (0x1B)
- /* @remark: 结构体定义 */
- typedef struct
- {
- int i_size; // p_data字节数
- int i_data; // 当前操作字节的位置
- unsigned char i_mask; // 当前操作位的掩码
- unsigned char *p_data; // bits buffer
- } BITS_BUFFER_S;
- typedef struct
- {
- unsigned int startcode : 24; // 固定为00 00 01
- unsigned int stream_id : 8; // 0xC0-0xDF audio stream, 0xE0-0xEF video stream, 0xBD Private stream 1, 0xBE Padding stream, 0xBF Private stream 2
- unsigned short pack_len; // PES packet length
- } __attribute__ ((packed)) PES_HEAD_S;
- typedef struct
- {
- #if (BYTE_ORDER == LITTLE_ENDIAN)
- unsigned char original : 1; // original or copy, 原版或拷贝
- unsigned char copyright : 1; // copyright flag
- unsigned char align : 1; // data alignment indicator, 数据定位指示符
- unsigned char priority : 1; // PES priority
- unsigned char scramb : 2; // PES Scrambling control, 加扰控制
- unsigned char fixed : 2; // 固定为10
- unsigned char exten : 1; // PES extension flag
- unsigned char crc : 1; // PES CRC flag
- unsigned char acopy : 1; // additional copy info flag
- unsigned char trick : 1; // DSM(Digital Storage Media) trick mode flag
- unsigned char rate : 1; // ES rate flag, ES流速率标志
- unsigned char escr : 1; // ESCR(Elementary Stream Clock Reference) flag, ES流时钟基准标志
- unsigned char pts_dts : 2; // PTS DTS flags, 00 no PTS and DTS, 01 forbid, 10 have PTS, 11 have PTS and DTS
- #elif (BYTE_ORDER == BIG_ENDIAN)
- unsigned char fixed : 2; // 固定为10
- unsigned char scramb : 2; // PES Scrambling control, 加扰控制
- unsigned char priority : 1; // PES priority
- unsigned char align : 1; // data alignment indicator, 数据定位指示符
- unsigned char copyright : 1; // copyright flag
- unsigned char original : 1; // original or copy, 原版或拷贝
- unsigned char pts_dts : 2; // PTS DTS flags, 00 no PTS and DTS, 01 forbid, 10 have PTS, 11 have PTS and DTS
- unsigned char escr : 1; // ESCR(Elementary Stream Clock Reference) flag, ES流时钟基准标志
- unsigned char rate : 1; // ES rate flag, ES流速率标志
- unsigned char trick : 1; // DSM(Digital Storage Media) trick mode flag
- unsigned char acopy : 1; // additional copy info flag
- unsigned char crc : 1; // PES CRC flag
- unsigned char exten : 1; // PES extension flag
- #endif
- unsigned char head_len; // PES header data length
- } __attribute__ ((packed)) PES_OPTION_S;
- typedef struct
- {// ts total 33 bits
- #if (BYTE_ORDER == LITTLE_ENDIAN)
- unsigned char fixed2 : 1; // 固定为1
- unsigned char ts1 : 3; // bit30-32
- unsigned char fixed1 : 4; // DTS为0x01, PTS为0x02, PTS+DTS则PTS为0x03
- unsigned char ts2; // bit22-29
- unsigned char fixed3 : 1; // 固定为1
- unsigned char ts3 : 7; // bit15-21
- unsigned char ts4; // bit7-14
- unsigned char fixed4 : 1; // 固定为1
- unsigned char ts5 : 7; // bit0-6
- #elif (BYTE_ORDER == BIG_ENDIAN)
- unsigned char fixed1 : 4; // DTS为0x01, PTS为0x02, PTS+DTS则PTS为0x03
- unsigned char ts1 : 3; // bit30-32
- unsigned char fixed2 : 1; // 固定为1
- unsigned char ts2; // bit22-29
- unsigned char ts3 : 7; // bit15-21
- unsigned char fixed3 : 1; // 固定为1
- unsigned char ts4; // bit7-14
- unsigned char ts5 : 7; // bit0-6
- unsigned char fixed4 : 1; // 固定为1
- #endif
- } __attribute__ ((packed)) PES_PTS_S;
- /* remark:接口函数定义 */
- int bits_initwrite(BITS_BUFFER_S *p_buffer, int i_size, unsigned char *p_data)
- {
- if (!p_data)
- {
- return -1;
- }
- p_buffer->i_size = i_size;
- p_buffer->i_data = 0;
- p_buffer->i_mask = 0x80;
- p_buffer->p_data = p_data;
- p_buffer->p_data[0] = 0;
- return 0;
- }
- void bits_align(BITS_BUFFER_S *p_buffer)
- {
- if (p_buffer->i_mask != 0x80 && p_buffer->i_data < p_buffer->i_size)
- {
- p_buffer->i_mask = 0x80;
- p_buffer->i_data++;
- p_buffer->p_data[p_buffer->i_data] = 0x00;
- }
- }
- inline void bits_write(BITS_BUFFER_S *p_buffer, int i_count, unsigned long i_bits)
- {
- while (i_count > 0)
- {
- i_count--;
- if ((i_bits >> i_count ) & 0x01)
- {
- p_buffer->p_data[p_buffer->i_data] |= p_buffer->i_mask;
- }
- else
- {
- p_buffer->p_data[p_buffer->i_data] &= ~p_buffer->i_mask;
- }
- p_buffer->i_mask >>= 1;
- if (p_buffer->i_mask == 0)
- {
- p_buffer->i_data++;
- p_buffer->i_mask = 0x80;
- }
- }
- }
- int bits_initread(BITS_BUFFER_S *p_buffer, int i_size, unsigned char *p_data)
- {
- if (!p_data)
- {
- return -1;
- }
- p_buffer->i_size = i_size;
- p_buffer->i_data = 0;
- p_buffer->i_mask = 0x80;
- p_buffer->p_data = p_data;
- return 0;
- }
- inline int bits_read(BITS_BUFFER_S *p_buffer, int i_count, unsigned long *i_bits)
- {
- if (!i_bits)
- {
- return -1;
- }
- *i_bits = 0;
- while (i_count > 0)
- {
- i_count--;
- if (p_buffer->p_data[p_buffer->i_data] & p_buffer->i_mask)
- {
- *i_bits |= 0x01;
- }
- if (i_count)
- {
- *i_bits = *i_bits << 1;
- }
- p_buffer->i_mask >>= 1;
- if(p_buffer->i_mask == 0)
- {
- p_buffer->i_data++;
- p_buffer->i_mask = 0x80;
- }
- }
- return 0;
- }
5 写在最后
看过我上一篇的关于ps封装的可能会注意的,关于压字节的处理,两篇博文到处理方式有些差异。关于我这个我简单说两点
第一次是这个ts的处理里面封装是另外一个同事实现的,我因为用到所以拿来使用,但是上次调用封装都是自己完成。第二个就是
ps和ts的处理方式不一样。一个定长,一个不定长。所以这样处理,也挺好的,我也有点懒,所以没有改过来。
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视频知识点(20)- H264码流如何在SPS中获取宽高信息?