快站公众号工具,免费安装app,王串场街网站建设公司,做网站推广有效果吗ffmpeg播放rtp流#xff0c;为了降低首开延迟#xff0c;需要在SDP文件中指定PPS、SPS、VPS信息。抓包后发现wireshark无法解析AP包。需要自己进行AP包解析。RTP协议AP包格式如下#xff1a; 根据如上信息#xff0c;我们可以解析AP包#xff0c;效果如下
40 01#xff…ffmpeg播放rtp流为了降低首开延迟需要在SDP文件中指定PPS、SPS、VPS信息。抓包后发现wireshark无法解析AP包。需要自己进行AP包解析。RTP协议AP包格式如下 根据如上信息我们可以解析AP包效果如下
40 01type32,VPS(视频参数集)42 01type33,SPS(序列参数集)44 01type34,PPS(图像参数集)4E 01, type39,SEI(补充增强信息)26 01type19,可能有RADL图像的IDR图像的SS编码数据 IDR02 01, type01,被参考的后置图像且非TSA、非STSA的SS编码数据46 01type35,分隔符没用。
下图中红色部分是分隔符橙色是VPS黑色是SPS黄色为PPS SDP中的VPS等信息需要转换成base64。使用下面的函数可转换 #include stdio.h #include inttypes.h #include math.h #include limits.h #include signal.h #include stdint.h #include string #include string.h #include iostream #define AV_BASE64_SIZE(x) (((x)2) / 3 * 4 1) # define AV_RB32(x) \ (((uint32_t)((const uint8_t*)(x))[0] 24) | \ (((const uint8_t*)(x))[1] 16) | \ (((const uint8_t*)(x))[2] 8) | \ ((const uint8_t*)(x))[3]) using namespace std; char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size) { static const char b64[] ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789/; char *ret, *dst; unsigned i_bits 0; int i_shift 0; int bytes_remaining in_size; if (in_size UINT_MAX / 4 || out_size AV_BASE64_SIZE(in_size)) return NULL; ret dst out; while (bytes_remaining 3) { i_bits AV_RB32(in); in 3; bytes_remaining - 3; *dst b64[ i_bits26 ]; *dst b64[(i_bits20) 0x3F]; *dst b64[(i_bits14) 0x3F]; *dst b64[(i_bits8 ) 0x3F]; } i_bits 0; while (bytes_remaining) { i_bits (i_bits 8) *in; bytes_remaining--; i_shift 8; } while (i_shift 0) { *dst b64[(i_bits 6 i_shift) 0x3f]; i_shift - 6; } while ((dst - ret) 3) *dst ; *dst \0; return ret; } //sprop-vpsQAEMAf//AWAAAAMAkAAAAwAAAwBalZgJ; sprop-spsQgEBAWAAAAMAkAAAAwAAAwBaoAeCAIh95ZWaSTK8BacIAAADAAgAAAMA8EA; sprop-ppsRAHBcrRiQA void getXPSfromAP(uint8_t* ap){ int pos 0; while(true){ uint16_t hdr (ap[pos2]8)|(ap[pos3]); int typ (hdr9)0x3f; int siz (ap[pos0]8)|(ap[pos1])-2; switch(typ){ case 32: { char str_vps[100]{0}; uint8_t* vps (uint8_t*)malloc(siz); memcpy(vps,appos4,siz); av_base64_encode(str_vps,100,vps,siz); coutsprop-vpsstr_vps; free(vps); break; } case 33: { char str_sps[100]{0}; uint8_t* sps (uint8_t*)malloc(siz); memcpy(sps,appos4,siz); av_base64_encode(str_sps,100,sps,siz); cout; sprop-spsstr_sps; free(sps); break; } case 34: { char str_pps[100]{0}; uint8_t* pps (uint8_t*)malloc(siz); memcpy(pps,appos4,siz); av_base64_encode(str_pps,100,pps,siz); cout; sprop-ppsstr_ppsendl; free(pps); return; break; } default: break; } pos 4; pos siz; } }
int main() { uint8_t in[]{0x67, 0x42,0xc0,0x14,0xf4,0x0b,0x04,0xb4,0x20,0x00,0x00,0x03,0x00,0x20,0x00,0x00,0x03,0x03,0xd1,0xe2,0x85,0x54}; char str_sps[100]{0}; av_base64_encode(str_sps,100,in,22); coutspssbasecode:str_spsendl; uint8_t pps[]{0x68 ,0xce ,0x04 ,0xf2}; char str_sps2[100]{0}; av_base64_encode(str_sps2,100,pps,4); coutppssbasecode:str_sps2endl;
uint8_t ap[] {0x00,0x17,0x40,0x01,0x0c,0x01,0xff,0xff,0x01,0x60,0x00,0x00,0x03,0x00,0xb0,0x00,0x00,0x03,0x00,0x00,0x03,0x00,0x5a,0xac,0x09,0x00,0x22,0x42, 0x01,0x01,0x01,0x60,0x00,0x00,0x03,0x00,0xb0,0x00,0x00,0x03,0x00,0x00,0x03,0x00,0x5a,0xa0,0x0f,0x08,0x03,0xc1,0x63,0x6b,0x92,0x45,0x2f, 0x4d,0x40,0x40,0x40,0x40,0x20,0x00,0x08,0x44,0x01,0xc0,0xf2,0xce,0x70,0x3b,0x34,0x00,0x09,0x4e,0x01,0xe5,0x04,0x00,0x00,0x70,0x00,0x80,0x00, 0x1e,0x4e,0x01,0x89,0x18,0x3a,0x98,0x75,0x30,0x1d,0x4c,0x0b,0xb8,0x7d,0x00,0x40,0x74,0x3d,0x13,0x40,0x42,0x00,0x00,0x04,0xb0,0x00,0x00,0x03,0x00,0xc8,0x80}; getXPSfromAP(ap); return 0; }
