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h264_rtp.c
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h264_rtp.c
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/*
* h264_rtp.c
*
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include "h264_rtp.h"
#include "video_rtp.h"
#include "libv_log.h"
static const uint32_t MAX_H264_NAL_LEN = 1024 * 1024;//初始申请1024k。要保证能够容纳最大的帧，后面不再申请。
static const uint8_t NEW_FRAME_START_SEQUENCE[] = { 0, 0, 0, 1 };
static const uint8_t MIDDLE_FRAME_START_SEQUENCE[] = { 0, 0, 1 };
static uint32_t MAX_ETH_IP_UDP_RTP_HEADER_LEN = 56; //:16 + 20 + 8 + 12
static uint32_t RTP_HEADER_LEN = 12;
#define MAX_STAP_A_NAL_COUNT 32 //STAP_A模式下，一个包最多可以包含包的个数
#define MAX_FU_A_RTP_COUNT 1024 //FU_A模式下，一个包最多可以分为多个包的个数
#define RTP_HEVC_PAYLOAD_HEADER_SIZE 2
#define RTP_HEVC_FU_HEADER_SIZE 1
#define RTP_HEVC_DONL_FIELD_SIZE 2
#define RTP_HEVC_DOND_FIELD_SIZE 1
#define RTP_HEVC_AP_NALU_LENGTH_FIELD_SIZE 2
#define HEVC_SPECIFIED_NAL_UNIT_TYPES 48
//rtp解包结构体
typedef struct __H264_RTP_DEC_ST
{
VIDEO_CODEC_TYPE codec_type; //区分是h264或h265
uint32_t donl_flag; //donlflag，影响解码。只h265解码时有效
uint8_t *slice_data; //[0,0,0,1]Start sequence + [nal header, data]NAL data，可以重复多次。
uint32_t data_len; //nal_data中内容的长度，实际使用长度
uint32_t data_size; //slice_data内存中的长度。
uint32_t fua_loss_flg; //FU_A模式下是否有一个分包丢弃；如果有丢弃，则会丢弃其他所有包
int32_t pre_seq; //上一个rtp包序号，用于判断是否丢包
uint32_t pre_ssrc; //上一个rtp包ssrc，用于判断是同一个源暂不使用
uint32_t packet_count; //packet个数，packets最大值下标。 0: one NAL data is not ready; 1: one NAL data is ready; n:多个包在data中。
uint32_t pre_mark_flg; //上一个包的mark标志位
uint32_t pre_timestamp; //上一个包时戳
H264_NAL_DATA packets[MAX_STAP_A_NAL_COUNT]; //存储解析出来的packet包
}H264_RTP_DEC_ST;
//rtp压包结构体
typedef struct __H264_RTP_ENC_ST
{
uint8_t *rtp_data; //rtp包缓存,初始申请长度为：MAX_H264_NAL_LEN
uint32_t data_len; //nal_data中内容的长度，实际使用长度
uint32_t data_size; //rtp_data内存中的长度。
uint32_t pload_type;
uint32_t ssrc;
uint32_t max_pload_size; //pload的最大值
uint16_t cur_seq;
PACKET_MODE_E packet_mode; //打包模式
uint32_t packet_count; //packet个数，packets最大值下标。
H264_RTP_PACKET packets[MAX_FU_A_RTP_COUNT]; //存储编码后的RTP包
}H264_RTP_ENC_ST;
H264_RTP_DEC_TH alloc_h264_rtp_dec_th()
{
H264_RTP_DEC_ST *ph264dec_th = (H264_RTP_DEC_ST *)malloc(sizeof(H264_RTP_DEC_ST));
if (NULL == ph264dec_th)
{
elog("alloc ph264dec_th memery is fail!");
return NULL;
}
memset(ph264dec_th, 0, sizeof(H264_RTP_DEC_ST));
ph264dec_th->codec_type = VIDEO_CODEC_H264;
ph264dec_th->packet_count = 0;
ph264dec_th->data_len = 0;
ph264dec_th->slice_data = (uint8_t *)malloc(MAX_H264_NAL_LEN);//初始申请。要保证能够容纳最大的帧，后面不够再realloc。
if (NULL == ph264dec_th->slice_data)
{
elog("alloc slice_data memery is fail!");
free(ph264dec_th);
return NULL;
}
ph264dec_th->data_size = MAX_H264_NAL_LEN;
ph264dec_th->pre_seq = -1; //
ph264dec_th->pre_ssrc = 0;
ph264dec_th->fua_loss_flg = 0;
ph264dec_th->pre_mark_flg = 1; //上一个包的标志应该置为1，这样受到第一个包会认为是新报
memset(ph264dec_th->packets, 0, sizeof(ph264dec_th->packets));
return (H264_RTP_DEC_TH )ph264dec_th;
}
void free_h264_rtp_dec_th(H264_RTP_DEC_TH pdec_th)
{
H264_RTP_DEC_ST *prtpdec_th = (H264_RTP_DEC_ST *)pdec_th;
if (prtpdec_th)
{
if (prtpdec_th->slice_data)
{
free(prtpdec_th->slice_data);
}
free(prtpdec_th);
}
}
//情况标志和数据，开始新的rtp解析
static void reset_h264_rtp_dec_th_data(H264_RTP_DEC_ST *pdec_th)
{
pdec_th->packet_count = 0;
pdec_th->data_len = 0;
pdec_th->fua_loss_flg = 0;
}
static int32_t realloc_h264_rtp_dec_nalu_data_buf(H264_RTP_DEC_ST *pdec_th, int32_t data_size)
{
int32_t new_size = 0;
uint8_t *ptmp_buf = NULL;
new_size = pdec_th->data_size + sizeof(NEW_FRAME_START_SEQUENCE) + ((data_size > (pdec_th->data_size / 2) ? data_size:(pdec_th->data_size / 2)));
ptmp_buf = (uint8_t *)realloc(pdec_th->slice_data, new_size);
if (NULL == ptmp_buf)
{
elog("Realloc slice_data is fail:new size[%d].", new_size);
return -1;
}
pdec_th->slice_data = ptmp_buf;
pdec_th->data_size = new_size;
return 0;
}
//单包模式下添加一个nalu，包含起始码。一个nalu就是一帧
static int32_t h264_rtp_dec_add_one_nalu_one_frame(H264_RTP_DEC_ST *pdec_th, uint8_t nal_type, uint32_t timestamp,
int32_t data_size, const uint8_t *data_buf)
{
if (pdec_th->packet_count >= MAX_STAP_A_NAL_COUNT)
{
elog("Funtion reset_h264_rtp_dec_add_packet:the packet_count[%d] is larger than MAX_STAP_A_NAL_COUNT[%d]",
pdec_th->packet_count, MAX_STAP_A_NAL_COUNT);
return -1;
}
if ((pdec_th->data_len + sizeof(NEW_FRAME_START_SEQUENCE) + data_size) >= pdec_th->data_size)
{
if (0 != realloc_h264_rtp_dec_nalu_data_buf(pdec_th, data_size))
{
elog("Realloc slice_data is fail:new size[%d].", pdec_th->data_size);
return -1;
}
}
H264_NAL_DATA *pnal_pack = (H264_NAL_DATA *)&(pdec_th->packets[pdec_th->packet_count]);
pnal_pack->used_flag = 1;
pnal_pack->nal_type = nal_type;
pnal_pack->timestamp = timestamp;
pnal_pack->data_size = data_size + sizeof(NEW_FRAME_START_SEQUENCE);
pnal_pack->data_buf = pdec_th->slice_data + pdec_th->data_len;
pnal_pack->frame_end_flg = 1;
memcpy(pdec_th->slice_data + pdec_th->data_len, NEW_FRAME_START_SEQUENCE, sizeof(NEW_FRAME_START_SEQUENCE));
pdec_th->data_len += sizeof(NEW_FRAME_START_SEQUENCE);
memcpy(pdec_th->slice_data + pdec_th->data_len, data_buf, data_size);
pdec_th->data_len += data_size;
pdec_th->packet_count += 1;
return 0;
}
//添加一个nalu起始码，如果是新的一帧开始（is_new_frame == 1），则填00 00 00 01，否则填00 00 01
static int32_t h264_rtp_dec_add_nalu_start_sequence(H264_RTP_DEC_ST *pdec_th, int32_t is_new_frame,
uint8_t nal_type, uint32_t timestamp)
{
if (NULL == pdec_th)
{
elog("h264_rtp_dec_add_nalu_start_sequence:input is error!");
return -1;
}
if (pdec_th->packet_count >= MAX_STAP_A_NAL_COUNT)
{
elog("Funtion h264_rtp_dec_add_nalu_start_sequence:the packet_count[%d] is larger than MAX_STAP_A_NAL_COUNT[%d]",
pdec_th->packet_count, MAX_STAP_A_NAL_COUNT);
return -1;
}
if ((pdec_th->data_len + sizeof(NEW_FRAME_START_SEQUENCE)) >= pdec_th->data_size)
{
if (0 != realloc_h264_rtp_dec_nalu_data_buf(pdec_th, sizeof(NEW_FRAME_START_SEQUENCE)))
{
elog("Realloc slice_data is fail:new size[%d].", pdec_th->data_size);
return -1;
}
}
// if (pdec_th->packet_count > 0)
// {
// pdec_th->packets[pdec_th->packet_count - 1].frame_end_flg = 1;//上一个结束标志置1
// }
H264_NAL_DATA *pnal_pack = (H264_NAL_DATA *)&(pdec_th->packets[pdec_th->packet_count]);
if (is_new_frame)
{
pnal_pack->used_flag = 1;
pnal_pack->nal_type = nal_type;
pnal_pack->timestamp = timestamp;
pnal_pack->data_size = sizeof(NEW_FRAME_START_SEQUENCE);
pnal_pack->data_buf = pdec_th->slice_data + pdec_th->data_len;
pnal_pack->frame_end_flg = 0;
memcpy(pdec_th->slice_data + pdec_th->data_len, NEW_FRAME_START_SEQUENCE, sizeof(NEW_FRAME_START_SEQUENCE));
pdec_th->data_len += sizeof(NEW_FRAME_START_SEQUENCE);
}
else
{
pnal_pack->used_flag = 1;
pnal_pack->nal_type = nal_type;
pnal_pack->timestamp = timestamp;
pnal_pack->data_size += sizeof(MIDDLE_FRAME_START_SEQUENCE);
pnal_pack->frame_end_flg = 0;
memcpy(pdec_th->slice_data + pdec_th->data_len, MIDDLE_FRAME_START_SEQUENCE, sizeof(MIDDLE_FRAME_START_SEQUENCE));
pdec_th->data_len += sizeof(MIDDLE_FRAME_START_SEQUENCE);
}
return 0;
}
//添加当前帧的结束标志
static int32_t h264_rtp_dec_add_frame_end_flag(H264_RTP_DEC_ST *pdec_th)
{
pdec_th->fua_loss_flg = 0;
if (pdec_th->packet_count >= MAX_STAP_A_NAL_COUNT)
{
elog("Funtion h264_rtp_dec_add_nalu_start_sequence:the packet_count[%d] is larger than MAX_STAP_A_NAL_COUNT[%d]",
pdec_th->packet_count, MAX_STAP_A_NAL_COUNT);
return -1;
}
H264_NAL_DATA *pnal_pack = (H264_NAL_DATA *)&(pdec_th->packets[pdec_th->packet_count]);
if (pnal_pack->used_flag)
{
pnal_pack->frame_end_flg = 1;
pdec_th->packet_count += 1;
}
return 0;
}
//添加一帧的部分数据
static int32_t h264_rtp_dec_add_part_data_of_frame(H264_RTP_DEC_ST *pdec_th, int32_t data_size, const uint8_t *data_buf)
{
if (pdec_th->packet_count >= MAX_STAP_A_NAL_COUNT)
{
elog("Funtion h264_rtp_dec_add_nalu_start_sequence:the packet_count[%d] is larger than MAX_STAP_A_NAL_COUNT[%d]",
pdec_th->packet_count, MAX_STAP_A_NAL_COUNT);
return -1;
}
if ((pdec_th->data_len + data_size) >= pdec_th->data_size)
{
if (0 != realloc_h264_rtp_dec_nalu_data_buf(pdec_th, data_size))
{
elog("Realloc slice_data is fail:new size[%d].", pdec_th->data_size);
return -1;
}
}
H264_NAL_DATA *pnal_pack = (H264_NAL_DATA *)&(pdec_th->packets[pdec_th->packet_count]);
pnal_pack->data_size += data_size;
memcpy(pdec_th->slice_data + pdec_th->data_len, data_buf, data_size);
pdec_th->data_len += data_size;
return 0;
}
//rtp_buf:包含rtp包头.返回值：获得包的个数.-1表示解析失败
int32_t h264_dec_rtp(H264_RTP_DEC_TH pdec_th, const uint8_t *rtp_buf, int32_t buf_len)
{
const uint8_t * pnalbuf = NULL;
uint8_t nal = 0;
uint8_t type = 0;
uint8_t nal_type = 0;
uint8_t cur_mark_flg = 0; //当前包mark标志
uint8_t pre_mark_flg = 0; //上一个包的mark标志
int32_t nal_len = 0;
H264_RTP_DEC_ST *prtp_dec_th = (H264_RTP_DEC_ST *)pdec_th;
uint16_t seq = 0;
uint32_t pre_timestamp = 0;
uint32_t timestamp = 0;
uint32_t is_loss_flg = 0; //是否发生过丢包
if ((NULL == pdec_th) || (NULL == rtp_buf))
{
return -1;
}
if (buf_len < RTP_HEADER_LEN + 1)
{
elog("h264 rtp dec: buf len[%d] is less than 13", buf_len);
return -1;
}
//获取序号和时戳
seq = ntohs(*(uint16_t *)(&rtp_buf[2]));
timestamp = ntohl(*(uint32_t *)(&rtp_buf[4]));
if ((prtp_dec_th->pre_seq + 1 != seq) && (prtp_dec_th->pre_seq != -1)) //有跳跃且非初始值；
{
if ((prtp_dec_th->pre_seq == 65535) && (seq == 0)) //临界值，则不算丢包
{
}
else
{
wlog("There is lose packet or sequence is error.pre[%d], cur[%d]", prtp_dec_th->pre_seq, seq);
is_loss_flg = 1;
}
}
prtp_dec_th->pre_seq = seq; //记录当前序号
pre_timestamp = prtp_dec_th->pre_timestamp; //记录上一个时戳
prtp_dec_th->pre_timestamp = timestamp;
pnalbuf = rtp_buf + RTP_HEADER_LEN;//首先跳过12个字节的rtp包头。
nal_len = buf_len - RTP_HEADER_LEN;
nal = pnalbuf[0];
type = nal & 0x1f;//取后五位，表示是哪种类型的打包方式
nal_type = type;
cur_mark_flg = rtp_buf[1] & 0x80; //取第一位的值，为mark标志位
pre_mark_flg = prtp_dec_th->pre_mark_flg;
prtp_dec_th->pre_mark_flg = cur_mark_flg; //更改对象记录
/*
Type Packet Type name
---------------------------------------------------------
0 undefined -
1-23 NAL unit Single NAL unit packet per H.264
24 STAP-A Single-time aggregation packet
25 STAP-B Single-time aggregation packet
26 MTAP16 Multi-time aggregation packet
27 MTAP24 Multi-time aggregation packet
28 FU-A Fragmentation unit
29 FU-B Fragmentation unit
30-31 undefined -
*/
/* Simplify the case (these are all the nal types used internally by
* the h264 codec). */
if (type >= 1 && type <= 23)
{
type = 1;
}
switch (type)
{
case 0: // undefined, but pass them through
case 1:
//单包模式：
//只有在1，或5，视频帧的时候，把mark标志作为判断是否结束分包
if ((nal_type == 1 ) || (nal_type == 5))
{
if (pre_mark_flg && cur_mark_flg) //上一个标志和当前标志都为1，说明是单个包
{
reset_h264_rtp_dec_th_data(prtp_dec_th);
h264_rtp_dec_add_one_nalu_one_frame(prtp_dec_th, nal & 0x1f, timestamp, nal_len, pnalbuf);
}
else if (pre_mark_flg && !cur_mark_flg) //上一个包标志为1，当前为0，说明是新的帧开始
{
reset_h264_rtp_dec_th_data(prtp_dec_th);
h264_rtp_dec_add_nalu_start_sequence(prtp_dec_th, 1, nal & 0x1f, timestamp);
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, nal_len, pnalbuf);
}
else if (!pre_mark_flg && !cur_mark_flg) //上一个标志和当前标志都为0，说明是一帧的中间包
{
//这里要判断时戳。两个时戳不同，则是新的帧，发生了丢包可能
if (pre_timestamp == timestamp) //时戳相同，则是同一帧的中间包。
{
//添加nal 头：00 00 01
h264_rtp_dec_add_nalu_start_sequence(prtp_dec_th, 0, nal & 0x1f, timestamp);
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, nal_len, pnalbuf);
}
else //可能发生了丢包，最后一个带有mark的包没有了，开始新的包
{
//首先将上一个包结束
h264_rtp_dec_add_frame_end_flag(prtp_dec_th);
//开始一个新的包
h264_rtp_dec_add_nalu_start_sequence(prtp_dec_th, 1, nal & 0x1f, timestamp);
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, nal_len, pnalbuf);
}
}
else if (!pre_mark_flg && cur_mark_flg) //上一个标志0， 当前标志为1，说明是一帧结束包
{
//这里要判断时戳。两个时戳不同，怎么是新的帧，发生了丢包可能
if (pre_timestamp == timestamp) //时戳相同，则是同一帧的结束包。
{
//添加nal 头：00 00 01
h264_rtp_dec_add_nalu_start_sequence(prtp_dec_th, 0, nal & 0x1f, timestamp);
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, nal_len, pnalbuf);
h264_rtp_dec_add_frame_end_flag(prtp_dec_th);
}
else //可能发生了丢包，最后一个带有mark的包没有了，开始新的包
{
//首先将上一个包结束
h264_rtp_dec_add_frame_end_flag(prtp_dec_th);
//开始一个新的包
h264_rtp_dec_add_one_nalu_one_frame(prtp_dec_th, nal & 0x1f, timestamp, nal_len, pnalbuf);
}
}
}
else
{
//其他类型的包，不管类型，都认为是新的包。并把上一个包mark标志置为1,表示下一个包是新的开始
//首先将上一个包结束
h264_rtp_dec_add_frame_end_flag(prtp_dec_th);
h264_rtp_dec_add_one_nalu_one_frame(prtp_dec_th, nal & 0x1f, timestamp, nal_len, pnalbuf);
prtp_dec_th->pre_mark_flg = 1;
}
return prtp_dec_th->packet_count;
break;
case 24: // STAP-A (one packet, multiple nals)
pnalbuf++;
nal_len--; // skip the fu_header
reset_h264_rtp_dec_th_data(prtp_dec_th);
while (nal_len > 2)
{
uint16_t nal_size = pnalbuf[0] * 256 + pnalbuf[1];
// sikp the size :two byte
pnalbuf += 2;
nal_len -= 2;
if (nal_size <= nal_len)
{
h264_rtp_dec_add_one_nalu_one_frame(prtp_dec_th, pnalbuf[0] & 0x1f, timestamp, nal_size, pnalbuf); //这里的type获取要看每个nal 的
pnalbuf += nal_size;
nal_len -= nal_size;
}
else
{
elog("nal size exceeds length: %d %d.", nal_size, nal_len);
break; //break while
}
}
return prtp_dec_th->packet_count;
break;
case 25: // STAP-B
case 26: // MTAP-16
case 27: // MTAP-24
case 29: // FU-B
//这里暂不支持。
elog("H264 pack no suport STAP-B MTAP-16 MTAP-24 FU-B.");
return -1;
break;
case 28: // FU-A (fragmented nal)
pnalbuf++;
nal_len--; // skip the fu_indicator
//要考虑的一种特殊情况是，一帧中有多个slice都是用fu_a编码的。最后要输出为一个nalu，而不是多个
if (nal_len > 1)
{
uint8_t fu_indicator = nal;
uint8_t fu_header = pnalbuf[0];
uint8_t start_bit = fu_header >> 7;
uint8_t end_bit = (fu_header & 0x40) >> 6;
uint8_t nal_unit_header = (fu_indicator & 0xe0) | (fu_header & 0x1f);//fu_indicator的前三位加上fu_header的后五位
pnalbuf++; //跳过头
nal_len--;
if (start_bit)//起始包
{
if (pre_mark_flg) //上一帧为结束帧，这一帧为新帧
{
reset_h264_rtp_dec_th_data(prtp_dec_th);
h264_rtp_dec_add_nalu_start_sequence(pdec_th, 1, nal_unit_header & 0x1f, timestamp);
}
else if (pre_timestamp != timestamp)//上一阵mark为0，但是这一帧时戳不同了，要停止上一帧，开始新帧
{
h264_rtp_dec_add_frame_end_flag(pdec_th);
h264_rtp_dec_add_nalu_start_sequence(pdec_th, 1, nal_unit_header & 0x1f, timestamp);
}
else //否则，就是中间的帧了
{
h264_rtp_dec_add_nalu_start_sequence(pdec_th, 0, nal_unit_header & 0x1f, timestamp);
}
//首先添加nal头，这要单独添加，因为不可以更改原有的数据。
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, sizeof(nal_unit_header), &nal_unit_header);
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, nal_len, pnalbuf);
}
else if (!end_bit) //中间包
{
if (pre_timestamp != timestamp)//上一阵mark为0，但是这一帧时戳不同了，要停止上一帧，开始新帧
{
h264_rtp_dec_add_frame_end_flag(pdec_th);
h264_rtp_dec_add_nalu_start_sequence(pdec_th, 1, nal_unit_header & 0x1f, timestamp);
//首先添加nal头，这要单独添加，因为不可以更改原有的数据。
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, sizeof(nal_unit_header), &nal_unit_header);
}
if (is_loss_flg)
{
prtp_dec_th->fua_loss_flg = 1;
}
if (prtp_dec_th->fua_loss_flg)
{
// dlog("The Fua loss flg is True, so lose this packet!");
// return prtp_dec_th->packet_count;
}
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, nal_len, pnalbuf);
}
else if (end_bit)//结束包
{
if (pre_timestamp != timestamp)//上一阵mark为0，但是这一帧时戳不同了，要停止上一帧，开始新帧
{
h264_rtp_dec_add_frame_end_flag(pdec_th);
h264_rtp_dec_add_nalu_start_sequence(pdec_th, 1, nal_unit_header & 0x1f, timestamp);
//首先添加nal头，这要单独添加，因为不可以更改原有的数据。
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, sizeof(nal_unit_header), &nal_unit_header);
}
if (is_loss_flg)
{
prtp_dec_th->fua_loss_flg = 1;
}
if (prtp_dec_th->fua_loss_flg)
{
// dlog("The Fua loss flg is True, so lose this packet!");
// return prtp_dec_th->packet_count;
}
h264_rtp_dec_add_part_data_of_frame(prtp_dec_th, nal_len, pnalbuf);
if (cur_mark_flg)
{
h264_rtp_dec_add_frame_end_flag(pdec_th);
}
}
}
else
{
elog("Too short data for FU-A H264 RTP packet");
return -1;
}
return prtp_dec_th->packet_count;
break;
case 30: // undefined
case 31: // undefined
default:
break;
}
return -1;
}
//函数返回数据的指针，没有数据则返回空。这个函数要一直调用，直到返回null为止，否则数据会被覆盖
//返回的指针或指针中的缓冲区不可以作为上层的存储缓冲区，如果需要保存一段时间，则需要重新申请新的缓冲区并拷贝。
//used_flag字段返回前会被置为0.
H264_NAL_DATA * h264_dec_rtp_get_nal_data(H264_RTP_DEC_TH pdec_th)
{
H264_RTP_DEC_ST *prtp_dec_th = (H264_RTP_DEC_ST *)pdec_th;
int32_t i = 0;
if (NULL == pdec_th)
{
elog("get_h264_slice_data args is error:[%p]", pdec_th);
return NULL;
}
if (prtp_dec_th->packet_count < 0)
{
return NULL;
}
if (prtp_dec_th->packet_count > MAX_STAP_A_NAL_COUNT)
{
elog("ph264th->data_count is error:[%d]", prtp_dec_th->packet_count);
return NULL;
}
for (i = 0; i < MAX_STAP_A_NAL_COUNT; i++)
{
if (prtp_dec_th->packets[i].used_flag && (prtp_dec_th->packets[i].frame_end_flg))
{
prtp_dec_th->packets[i].used_flag = 0;
if (prtp_dec_th->packet_count != 0)
{
prtp_dec_th->packet_count -= 1;
}
return &(prtp_dec_th->packets[i]);
}
else if ((i != 0) && prtp_dec_th->packets[i].used_flag && !(prtp_dec_th->packets[i].frame_end_flg))//在使用，没有结束
{
if (prtp_dec_th->packets[i].data_size <= prtp_dec_th->data_size)
{
//移到第一个位置上
memcpy(&(prtp_dec_th->packets[0]), &(prtp_dec_th->packets[i]), sizeof(prtp_dec_th->packets[0]));
//移动内存：
memcpy(prtp_dec_th->slice_data, prtp_dec_th->packets[i].data_buf, prtp_dec_th->packets[i].data_size);
prtp_dec_th->packets[0].data_buf = prtp_dec_th->slice_data;
prtp_dec_th->packets[0].data_size = prtp_dec_th->packets[i].data_size;
prtp_dec_th->packet_count = 0;
prtp_dec_th->data_len = prtp_dec_th->packets[0].data_size;
}
memset(&(prtp_dec_th->packets[i]), 0, sizeof((prtp_dec_th->packets[i])));
return NULL;
}
}
return NULL;
}
/*
*pload_type:负载类型；s_seq：起始序列号,使用随机数作为开始；
*ssrc：同步源id;frame_rate：帧率，目前仅支持整数，后面可能会支持浮点数
*mtu:单个ip包的最大限制，建议1498，此值包括ip包头，udp包头，rtp头的长度。
* */
H264_RTP_ENC_TH * alloc_h264_rtp_enc_th(uint8_t pload_type, uint16_t s_seq, uint32_t ssrc, uint32_t mtu, PACKET_MODE_E pm)
{
if (mtu <= MAX_ETH_IP_UDP_RTP_HEADER_LEN)
{
elog("mtu len is error[%d]! ", mtu);
return NULL;
}
H264_RTP_ENC_ST *penc_th = (H264_RTP_ENC_ST *)malloc(sizeof(H264_RTP_ENC_ST));
if (NULL == penc_th)
{
elog("alloc penc_th memery is fail! ");
return NULL;
}
penc_th->data_len = 0;
penc_th->rtp_data = (uint8_t *)malloc(MAX_H264_NAL_LEN);//初始申请。要保证能够容纳最大的帧，后面不再申请。
if (NULL == penc_th->rtp_data)
{
elog("alloc rtp_data memery is fail! ");
free(penc_th);
return NULL;
}
penc_th->data_size = MAX_H264_NAL_LEN;
penc_th->pload_type = pload_type;
penc_th->cur_seq = s_seq;
penc_th->ssrc = ssrc;
penc_th->max_pload_size = mtu - MAX_ETH_IP_UDP_RTP_HEADER_LEN;
penc_th->packet_mode = pm;
penc_th->packet_count = 0;
memset(penc_th->packets, 0, sizeof(penc_th->packets));
return (H264_RTP_DEC_TH *)penc_th;
}
void free_h264_rtp_enc_th(H264_RTP_ENC_TH ph264dec_th)
{
H264_RTP_ENC_ST *penc_th = (H264_RTP_ENC_ST *)ph264dec_th;
if (NULL == penc_th)
{
elog("Funtion free_h264_rtp_enc_th input is error! ");
return ;
}
if (NULL != penc_th->rtp_data)
{
free(penc_th->rtp_data);
}
free(penc_th);
}
//last:是否是一个包的结束，0或1，需要设置rtp的mark标志,pl_buf:payload
//pre_buf:在payload_buf前先拷贝这一块buf。可以为空,此时pre_buf_len要为0。
static int32_t h264_enc_rtp_add_pack(H264_RTP_ENC_ST *penc_th, const uint8_t *pre_buf, int32_t pre_buf_len,
const uint8_t *payload_buf, int32_t buf_len, uint32_t timestamp, int32_t last)
{
uint8_t *pbuf = NULL;
uint16_t temp_seq = 0;
uint8_t *ptemp = NULL;
uint32_t itemp = 0;
uint32_t new_size = 0;
uint8_t * ptmp_buf = NULL;
H264_RTP_PACKET *ppack = NULL;
if ((NULL == penc_th) || (NULL == payload_buf))
{
elog("The input is error:h264_enc_rtp_add_rtp. ");
return -1;
}
if (penc_th->packet_count >= MAX_FU_A_RTP_COUNT)
{
elog("The penc_th->packet_count[%d] is larger than MAX_FU_A_RTP_COUNT[%d]. ", penc_th->packet_count , MAX_FU_A_RTP_COUNT);
return -1;
}
if ((penc_th->data_len + RTP_HEADER_LEN + buf_len + pre_buf_len) >= penc_th->data_size)
{
new_size = penc_th->data_size + penc_th->data_size / 2;
ptmp_buf = (uint8_t *)realloc(penc_th->rtp_data, new_size); //这里一定不能把realloc的返回值直接赋给penc_th->rtp_data。
if (NULL == ptmp_buf)
{
elog("Realloc rtp_data is fail:new size[%d]. ", new_size);
return -1;
}
penc_th->rtp_data = ptmp_buf;
penc_th->data_size = new_size;
}
pbuf = penc_th->rtp_data + penc_th->data_len;
pbuf[0] = 0x80;
pbuf[1] = (penc_th->pload_type & 0x7f) | ((last & 0x01) << 7);//第7位是makr标志位。
temp_seq = htons(penc_th->cur_seq);
ptemp = (uint8_t *)&temp_seq;
pbuf[2] = ptemp[0];
pbuf[3] = ptemp[1];
penc_th->cur_seq += 1; //序号 + 1
itemp = htonl(timestamp);
ptemp = (uint8_t *)&itemp;
pbuf[4] = ptemp[0];
pbuf[5] = ptemp[1];
pbuf[6] = ptemp[2];
pbuf[7] = ptemp[3];
itemp = htonl(penc_th->ssrc);
ptemp = (uint8_t *)&itemp;
pbuf[8] = ptemp[0];
pbuf[9] = ptemp[1];
pbuf[10] = ptemp[2];
pbuf[11] = ptemp[3];
if (pre_buf != NULL)
{
memcpy(&pbuf[RTP_HEADER_LEN], pre_buf, pre_buf_len);
penc_th->data_len += RTP_HEADER_LEN + pre_buf_len;
memcpy(&pbuf[RTP_HEADER_LEN + pre_buf_len], payload_buf, buf_len);
penc_th->data_len += buf_len;
}
else
{
memcpy(&pbuf[RTP_HEADER_LEN], payload_buf, buf_len);
penc_th->data_len += RTP_HEADER_LEN + buf_len;
}
ppack = &(penc_th->packets[penc_th->packet_count]);
ppack->used_flag = 1;
ppack->seq = penc_th->cur_seq - 1; //前面已经加过1了，所以这里要减一
ppack->data_buf = pbuf;
if (NULL != pre_buf)
{
ppack->data_size = RTP_HEADER_LEN + buf_len + pre_buf_len;
}
else
{
ppack->data_size = RTP_HEADER_LEN + buf_len;
}
penc_th->packet_count++;
return 0;
}
static int32_t h264_enc_rtp_one_nalu_is_clean(H264_RTP_ENC_TH ph264enc_th, const uint8_t *nal_buf, int32_t buf_len, uint32_t timestamp,
uint32_t mark_flg, uint32_t clean_flg)
{
H264_RTP_ENC_ST *penc_th = (H264_RTP_ENC_ST *)ph264enc_th;
const uint8_t *pbuf = nal_buf;
uint8_t type = 0;
uint8_t nri = 0;
uint8_t fu_head[2] = "";
int32_t tmp_buf_len = buf_len;
if ((NULL == ph264enc_th) || (NULL == nal_buf) || (tmp_buf_len < 6))
{
elog("The input is error:h264_enc_rtp_send. buf_len[%d]", tmp_buf_len);
return -1;
}
if (nal_buf[2] == 0) //开始码为：0，0，0，1
{
pbuf = nal_buf + 4;
tmp_buf_len = tmp_buf_len - 4;
}
else //开始码为0，0，1
{
pbuf = nal_buf + 3;
tmp_buf_len = tmp_buf_len - 3;
}
/*
+---------------+
|0|1|2|3|4|5|6|7|
+-+-+-+-+-+-+-+-+
|F|NRI| Type |
+---------------+
*/
type = pbuf[0] & 0x1F; //首字节后五位:目前，支持type是1或者5的时候才增加时戳
nri = pbuf[0] & 0x60; //首字节第二位和第三位
//收到一个包后，对编码结构体进行初始化，防止有残留数据
//memset(penc_th->rtp_data, 0, penc_th->data_size); //初始化缓存不进行，因为太大，会影响性能。依靠长度来保证不会拷贝错误。
//memset(penc_th->packets, 0, sizeof(penc_th->packets)); //初始化缓存不进行，因为太大，会影响性能。依靠长度来保证不会拷贝错误。
if (clean_flg)
{
penc_th->data_len = 0;
penc_th->packet_count = 0;
}
if (penc_th->packet_mode == PACKET_MODE_SINGLE) //如果上层指定，则强制用单包模式
{
// printf("buf len [%d]\n", buf_len);
h264_enc_rtp_add_pack(penc_th, NULL, 0, pbuf, tmp_buf_len, timestamp, mark_flg);
}
else if (((uint32_t)tmp_buf_len) <= penc_th->max_pload_size) //非交错模式，buf长度小于mtu，采用单个包模式
{
h264_enc_rtp_add_pack(penc_th, NULL, 0, pbuf, tmp_buf_len, timestamp, mark_flg);
}
else //非交错模式，buf长度大于mtu，采用FU-A模式
{
/*
+---------------+
|0|1|2|3|4|5|6|7|
+-+-+-+-+-+-+-+-+
|F|NRI| Type |
+---------------+
FU指示字节的类型域 Type=28表示FU-A。。NRI域的值必须根据分片NAL单元的NRI域的值设置。
FU header的格式如下：
+---------------+
|0|1|2|3|4|5|6|7|
+-+-+-+-+-+-+-+-+
|S|E|R| Type |
+---------------+
S: 1 bit
当设置成1,开始位指示分片NAL单元的开始。当跟随的FU荷载不是分片NAL单元荷载的开始，开始位设为0。
E: 1 bit
当设置成1, 结束位指示分片NAL单元的结束，即, 荷载的最后字节也是分片NAL单元的最后一个字节。当跟随的FU荷载不是分片NAL单元的最后分片,结束位设置为0。
R: 1 bit
保留位必须设置为0，接收者必须忽略该位。
Type: 5 bits
*/
pbuf = pbuf + 1; //跳过头，因为要重新组头。
tmp_buf_len--; //不包括2字节的包头
fu_head[0] = 28; //组fu_a的包头
fu_head[0] |= nri; //级别
fu_head[1] = type;
fu_head[1] |= 1 << 7; //设置S标志为1
while (((uint32_t)tmp_buf_len + sizeof(fu_head)) > penc_th->max_pload_size)
{
h264_enc_rtp_add_pack(penc_th, fu_head, sizeof(fu_head), pbuf,
penc_th->max_pload_size - sizeof(fu_head), timestamp, 0);
pbuf += penc_th->max_pload_size - sizeof(fu_head);
tmp_buf_len -= penc_th->max_pload_size - sizeof(fu_head);
fu_head[0] = 28; //把一个包头分成两个包头
fu_head[0] |= nri; //级别
fu_head[1] = type;
fu_head[1] &= ~(1 << 7); //设置S标志为0
}
fu_head[1] |= 1 << 6; //设置E标志为1
h264_enc_rtp_add_pack(penc_th, fu_head, sizeof(fu_head), pbuf, tmp_buf_len, timestamp, mark_flg);
}
return penc_th->packet_count;
}
int32_t h264_enc_rtp_one_nalu(H264_RTP_ENC_TH ph264enc_th, const uint8_t *nal_buf, int32_t buf_len, uint32_t timestamp, uint32_t mark_flg)
{
return h264_enc_rtp_one_nalu_is_clean(ph264enc_th, nal_buf, buf_len, timestamp, mark_flg, 1); //必须清空
}
static const uint8_t *avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
{
const uint8_t *a = p + 4 - ((intptr_t)p & 3);
for (end -= 3; p < a && p < end; p++) {
if (p[0] == 0 && p[1] == 0 && p[2] == 1)
return p;
}
for (end -= 3; p < end; p += 4) {
uint32_t x = *(uint32_t*)p;
// if ((x - 0x01000100) & (~x) & 0x80008000) // little endian
// if ((x - 0x00010001) & (~x) & 0x00800080) // big endian
if ((x - 0x01010101) & (~x) & 0x80808080) { // generic
if (p[1] == 0) {
if (p[0] == 0 && p[2] == 1)
return p;
if (p[2] == 0 && p[3] == 1)
return p+1;
}
if (p[3] == 0) {
if (p[2] == 0 && p[4] == 1)
return p+2;
if (p[4] == 0 && p[5] == 1)
return p+3;
}
}
}
for (end += 3; p < end; p++) {
if (p[0] == 0 && p[1] == 0 && p[2] == 1)
return p;
}
return end + 3;
}
static const uint8_t *avc_find_startcode(const uint8_t *p, const uint8_t *end){
const uint8_t *out= avc_find_startcode_internal(p, end);
if(p<out && out<end && !out[-1]) out--;
return out;
}
/*
int32_t h264_enc_rtp_access_unit(H264_RTP_ENC_TH ph264enc_th, uint8_t *an_buf, int32_t buf_len, uint32_t timestamp)
{
uint32_t count = 0;
int32_t ibuf_pos = 0;
int32_t mark_flag = 0;
int32_t i = 0;
int32_t islice_size = 0;
if ((NULL == an_buf) || (buf_len <= 0))
{
wlog("h264_enc_rtp_access_unit input is error! [%p] [%d]", an_buf, buf_len);
return -1;
}
while (ibuf_pos < buf_len)
{
for (i = 0; i + ibuf_pos + 4 < buf_len; i++)
{
if ((an_buf[ibuf_pos + i] == 0 && an_buf[ibuf_pos + i + 1] == 0 && an_buf[ibuf_pos + i + 2] == 0 && an_buf[ibuf_pos + i + 3] == 1 )
|| (an_buf[ibuf_pos + i] == 0 && an_buf[ibuf_pos + i + 1] == 0 && an_buf[ibuf_pos + i + 2] == 1 ))
{
if (i < 4)
{
continue;
}
printf("------------------------- %d %d\n", ibuf_pos + i , an_buf[ibuf_pos + i + 2]);
if (an_buf[ibuf_pos + i + 2] == 0)
{
mark_flag = 1;
}
else
{
mark_flag = 0;
}
break;
}
}
if (i + ibuf_pos + 4 >= buf_len) //说明已经超过结尾
{
islice_size = buf_len - ibuf_pos;
mark_flag = 1;
}
else
{
islice_size = i;
}
printf("111111111111111 %d mark_flag %d\n", islice_size, mark_flag);
count += h264_enc_rtp_one_nalu(ph264enc_th, an_buf + ibuf_pos, islice_size, timestamp, mark_flag);
ibuf_pos += islice_size;
}