148 lines
4.7 KiB
C
148 lines
4.7 KiB
C
/**
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* Description:
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* Author:created by bob on 17-6-21.
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*/
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//
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#ifndef DVRUNNING2_RTP_COMMON_H
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#define DVRUNNING2_RTP_COMMON_H
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#include "generic/typedef.h"
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#include "lwip/sockets.h"
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#include "lwip/netdb.h"
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#define PACKET_BUFFER_END (unsigned int)0x00000000
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#define MAX_RTP_PKT_LENGTH 1400
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#define DEST_IP "127.0.0.1"//"192.168.8.174"//"127.0.0.1"
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#define V_PORT 6666
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#define A_PORT 1234
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#define PT_PCM 97
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#define PT_H264 96
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#define MTU_SIZE 1500
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#define VIDEO_FRAMERATE 30
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#define AUDIO_SAMPLERATE 8000
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#define rtp "J_RTP"
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typedef struct {
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int startcodeprefix_len; // 4 for parameter sets and first slice in picture, 3 for everything else (suggested)
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unsigned len; // Length of the NAL unit(包含nal 头的nal 长度，从第一个00000001到下一个000000001的长度)
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unsigned int max_size; // Nal Unit Buffer size
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int forbidden_bit; // should be always FALSE
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int nal_reference_idc; // NALU_PRIORITY_xxxx
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int nal_unit_type; // NALU_TYPE_xxxx
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char *buf; // contains the first byte followed by the EBSP
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unsigned short lost_packets; // true, if packet loss is detected
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} NALU_t;
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#pragma pack(1)
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typedef struct rtp_hdr {
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/* 0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|V=2|P|X| CC |M| PT | sequence number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| synchronization source (SSRC) identifier |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| contributing source (CSRC) identifiers |
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| .... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/* byte 0 */
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unsigned char csrc_len: 4; /* expect 0 */
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unsigned char extension: 1; /* expect 1, see RTP_OP below */
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unsigned char padding: 1; /* expect 0 */
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unsigned char version: 2; /* expect 2 */
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/* byte 1 */
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unsigned char payload: 7; /* payload type */
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unsigned char marker: 1; /* expect 1 */
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/* bytes 2,3 */
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unsigned short seq_no;
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/* bytes 4-7 */
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unsigned long timestamp;
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/* bytes 8-11 */
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unsigned long ssrc;/* stream number is used here. */
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} rtp_hdr_t;
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#pragma pack()
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/*
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VCL 视频编码层 进行视频编解码
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NAL 网络提取层 采用适当的格式对视频数据进行封装打包
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VCL数据：
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即被压缩编码后的视频数据序列。在VCL数据要封装到NAL单元中之后，才可以用来传输或存储。
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*/
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//NALU Header结构
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typedef struct NALU_HEADER {
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/*
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+---------------+
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|0|1|2|3|4|5|6|7|
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+-+-+-+-+-+-+-+-+
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|F|NRI| Type |
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+---------------+
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*/
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unsigned char TYPE: 5; //NALU类型
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unsigned char NRI: 2; //重要性指示位
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unsigned char F: 1; //禁止位
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} nalu_hdr_t;
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//FU Indicator 结构
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typedef struct FU_INDICATOR {
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/*
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+---------------+
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|0|1|2|3|4|5|6|7|
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+-+-+-+-+-+-+-+-+
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|F|NRI| Type |
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+---------------+
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*/
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unsigned char TYPE: 5; //28表示FU-A，29表示FU-B
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unsigned char NRI: 2; //NALU的重要性，取00-11
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unsigned char F: 1; //当网络识别此单元存在比特错误时，可将其设为 1，以便接收方丢掉该单元
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} fu_indicator_t;
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//FU Header 结构
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//由于NALU被拆分多个分片（按顺序发送），必须要有一个标示表明FUs的第一个分片和最后一个分片
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typedef struct FU_HEADER {
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/*
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+---------------+
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|0|1|2|3|4|5|6|7|
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+-+-+-+-+-+-+-+-+
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|S|E|R| Type |
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+---------------+
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*/
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unsigned char TYPE: 5; //与NALU的Header中的Type类型一致。（注意不是FU Indicator中的类型）
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unsigned char R: 1; //保留位必须设置为0，接收者必须忽略该位
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unsigned char E: 1; //1表示NALU结束分片，0表示非结束NALU分片
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unsigned char S: 1; //1表示NALU开始分片，0表示非开始NALU分片
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} fu_hdr_t;
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typedef struct {
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int sockfd;
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struct sockaddr_in v_addr;
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struct sockaddr_in a_addr;
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NALU_t *nalu;
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} rtp_context_t;
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typedef struct _avframe {
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int type;
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uint32_t size;
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uint32_t sequence;
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uint32_t timestamp;
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uint32_t fps;
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uint32_t audio_sr;
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uint8_t buf[0];
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} avframe_t;
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enum AV_TYPE {
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AV_TYPE_AUDIO,
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AV_TYPE_VIDEO,
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};
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int rtp_create_socket();
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int rtp_send_packet(int type, const void *buf, size_t size);
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int rtp_close_socket();
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uint32_t rtp_get_video_timestamp();
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#endif //DVRUNNING2_RTP_COMMON_H
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