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rtp_enc.c
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/*************************************************************************
> File Name: rtp_enc.c
> Author: bxq
> Mail: [email protected]
> Created Time: Saturday, December 19, 2015 PM09:16:04 CST
************************************************************************/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "comm.h"
#include "rtp_enc.h"
struct rtphdr
{
#ifdef __BIG_ENDIAN__
uint16_t v:2;
uint16_t p:1;
uint16_t x:1;
uint16_t cc:4;
uint16_t m:1;
uint16_t pt:7;
#else
uint16_t cc:4;
uint16_t x:1;
uint16_t p:1;
uint16_t v:2;
uint16_t pt:7;
uint16_t m:1;
#endif
uint16_t seq;
uint32_t ts;
uint32_t ssrc;
};
#define RTPHDR_SIZE (12)
int rtp_enc_h264 (rtp_enc *e, const uint8_t *frame, int len, uint64_t ts, uint8_t *packets[], int pktsizs[])
{
int count = 0;
uint8_t nalhdr;
uint32_t rtp_ts;
if (!e || !frame || len <= 0 || !packets || !pktsizs)
return -1;
//drop 0001
if (frame[0] == 0 && frame[1] == 0 && frame[2] == 1) {
frame += 3;
len -= 3;
}
if (frame[0] == 0 && frame[1] == 0 && frame[2] == 0 && frame[3] == 1) {
frame += 4;
len -= 4;
}
nalhdr = frame[0];
rtp_ts = (uint32_t)(ts * e->sample_rate / 1000000);
while (len > 0 && packets[count] && pktsizs[count] > RTPHDR_SIZE) {
struct rtphdr *hdr = (struct rtphdr*)packets[count];
int pktsiz = pktsizs[count];
hdr->v = 2;
hdr->p = 0;
hdr->x = 0;
hdr->cc = 0;
hdr->m = 0;
hdr->pt = e->pt;
hdr->seq = htons(e->seq++);
hdr->ts = htonl(rtp_ts);
hdr->ssrc = htonl(e->ssrc);
if (count == 0 && len <= pktsiz - RTPHDR_SIZE) {
hdr->m = 1;
memcpy(packets[count] + RTPHDR_SIZE, frame, len);
pktsizs[count] = RTPHDR_SIZE + len;
frame += len;
len -= len;
} else {
int mark = 0;
if (count == 0) {
frame ++; //drop nalu header
len --;
} else if (len <= pktsiz - RTPHDR_SIZE - 2) {
mark = 1;
}
hdr->m = mark;
packets[count][RTPHDR_SIZE + 0] = (nalhdr & 0xe0) | 28;//FU-A
packets[count][RTPHDR_SIZE + 1] = (nalhdr & 0x1f);//FU-A
if (count == 0) {
packets[count][RTPHDR_SIZE + 1] |= 0x80; //S
}
if (mark) {
packets[count][RTPHDR_SIZE + 1] |= 0x40; //E
memcpy(packets[count] + RTPHDR_SIZE + 2, frame, len);
pktsizs[count] = RTPHDR_SIZE + 2 + len;
frame += len;
len -= len;
} else {
memcpy(packets[count] + RTPHDR_SIZE + 2, frame, pktsiz - RTPHDR_SIZE - 2);
pktsizs[count] = pktsiz;
frame += pktsiz - RTPHDR_SIZE - 2;
len -= pktsiz - RTPHDR_SIZE - 2;
}
}
count ++;
}
return count;
}
int rtp_enc_h265 (rtp_enc *e, const uint8_t *frame, int len, uint64_t ts, uint8_t *packets[], int pktsizs[])
{
int count = 0;
uint8_t nalhdr[2];
uint32_t rtp_ts;
if (!e || !frame || len <= 0 || !packets || !pktsizs)
return -1;
//drop 0001
if (frame[0] == 0 && frame[1] == 0 && frame[2] == 1) {
frame += 3;
len -= 3;
}
if (frame[0] == 0 && frame[1] == 0 && frame[2] == 0 && frame[3] == 1) {
frame += 4;
len -= 4;
}
nalhdr[0] = frame[0];
nalhdr[1] = frame[1];
rtp_ts = (uint32_t)(ts * e->sample_rate / 1000000);
while (len > 0 && packets[count] && pktsizs[count] > RTPHDR_SIZE) {
struct rtphdr *hdr = (struct rtphdr*)packets[count];
int pktsiz = pktsizs[count];
hdr->v = 2;
hdr->p = 0;
hdr->x = 0;
hdr->cc = 0;
hdr->m = 0;
hdr->pt = e->pt;
hdr->seq = htons(e->seq++);
hdr->ts = htonl(rtp_ts);
hdr->ssrc = htonl(e->ssrc);
if (count == 0 && len <= pktsiz - RTPHDR_SIZE) {
hdr->m = 1;
memcpy(packets[count] + RTPHDR_SIZE, frame, len);
pktsizs[count] = RTPHDR_SIZE + len;
frame += len;
len -= len;
} else {
int mark = 0;
if (count == 0) {
frame += 2; //drop nalu header
len -= 2;
} else if (len <= pktsiz - RTPHDR_SIZE - 3) {
mark = 1;
}
hdr->m = mark;
packets[count][RTPHDR_SIZE + 0] = (nalhdr[0] & 0x81) | (49 << 1);//FU-A
packets[count][RTPHDR_SIZE + 1] = (nalhdr[1]);
packets[count][RTPHDR_SIZE + 2] = ((nalhdr[0] >> 1) & 0x3f);//FU-A
if (count == 0) {
packets[count][RTPHDR_SIZE + 2] |= 0x80; //S
}
if (mark) {
packets[count][RTPHDR_SIZE + 2] |= 0x40; //E
memcpy(packets[count] + RTPHDR_SIZE + 3, frame, len);
pktsizs[count] = RTPHDR_SIZE + 3 + len;
frame += len;
len -= len;
} else {
memcpy(packets[count] + RTPHDR_SIZE + 3, frame, pktsiz - RTPHDR_SIZE - 3);
pktsizs[count] = pktsiz;
frame += pktsiz - RTPHDR_SIZE - 3;
len -= pktsiz - RTPHDR_SIZE - 3;
}
}
count ++;
}
return count;
}
int rtp_enc_aac (rtp_enc *e, const uint8_t *frame, int len, uint64_t ts, uint8_t *packets[], int pktsizs[])
{
int count = 0;
uint32_t rtp_ts;
uint32_t au_len;
if (!e || !frame || len <= 0 || !packets || !pktsizs)
return -1;
//drop fff
if (frame[0] == 0xff && (frame[1] & 0xf0) == 0xf0) {
frame += 7;
len -= 7;
}
rtp_ts = (uint32_t)(ts * e->sample_rate / 1000000);
au_len = len;
while (len > 0 && packets[count] && pktsizs[count] > RTPHDR_SIZE + 4) {
struct rtphdr *hdr = (struct rtphdr*)packets[count];
int pktsiz = pktsizs[count];
hdr->v = 2;
hdr->p = 0;
hdr->x = 0;
hdr->cc = 0;
hdr->m = 0;
hdr->pt = e->pt;
hdr->seq = htons(e->seq++);
hdr->ts = htonl(rtp_ts);
hdr->ssrc = htonl(e->ssrc);
packets[count][RTPHDR_SIZE+0] = 0x00;
packets[count][RTPHDR_SIZE+1] = 0x10;
packets[count][RTPHDR_SIZE+2] = au_len >> 5;
packets[count][RTPHDR_SIZE+3] = (au_len & 0x1f) << 3;
if (len <= pktsiz - RTPHDR_SIZE - 4) {
hdr->m = 1;
memcpy(packets[count] + RTPHDR_SIZE + 4, frame, len);
pktsizs[count] = RTPHDR_SIZE + 4 + len;
frame += len;
len -= len;
} else {
memcpy(packets[count] + RTPHDR_SIZE + 4, frame, pktsiz - RTPHDR_SIZE - 4);
pktsizs[count] = pktsiz;
frame += pktsiz - RTPHDR_SIZE - 4;
len -= pktsiz - RTPHDR_SIZE - 4;
}
count ++;
}
return count;
}
int rtp_enc_g711 (rtp_enc *e, const uint8_t *frame, int len, uint64_t ts, uint8_t *packets[], int pktsizs[])
{
int count = 0;
uint32_t rtp_ts;
if (!e || !frame || len <= 0 || !packets || !pktsizs)
return -1;
rtp_ts = (uint32_t)(ts * e->sample_rate / 1000000);
while (len > 0 && packets[count] && pktsizs[count] > RTPHDR_SIZE) {
struct rtphdr *hdr = (struct rtphdr*)packets[count];
int pktsiz = pktsizs[count];
hdr->v = 2;
hdr->p = 0;
hdr->x = 0;
hdr->cc = 0;
hdr->m = (e->seq == 0);
hdr->pt = e->pt;
hdr->seq = htons(e->seq++);
hdr->ts = htonl(rtp_ts);
hdr->ssrc = htonl(e->ssrc);
if (len <= pktsiz - RTPHDR_SIZE) {
memcpy(packets[count] + RTPHDR_SIZE, frame, len);
pktsizs[count] = RTPHDR_SIZE + len;
frame += len;
len -= len;
} else {
memcpy(packets[count] + RTPHDR_SIZE, frame, pktsiz - RTPHDR_SIZE);
pktsizs[count] = pktsiz;
frame += pktsiz - RTPHDR_SIZE;
len -= pktsiz - RTPHDR_SIZE;
}
count ++;
}
return count;
}
int rtp_enc_g726 (rtp_enc *e, const uint8_t *frame, int len, uint64_t ts, uint8_t *packets[], int pktsizs[])
{
return rtp_enc_g711(e, frame, len, ts, packets, pktsizs);
}