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                https://blog.csdn.net/CrystalShaw/article/details/109527689 根據《T-REC-H.265-201504-I!!PDF-E》協議描述。 ## 一,HEVC的碼流格式定義 字節流格式由字節流NAL 單元語法結構序列構成。每一字節流NAL 單元語法結構包含有一個起始編碼前綴,后面跟隨一個nal\_unit(NumBytesInNALunit)語法結構。它可能(一定情況下,它應該)包含一個額外的zero\_byte 語法元素。它也可能包含一個或多個額外的trailing\_zero\_8bits 語法元素。當為第一個字節流NAL 單元時,也可能包含一個或多個額外的leading\_zero\_8bits語法元素。 ![](https://img-blog.csdn.net/20180608162301887?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NyeXN0YWxTaGF3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70) ![](https://img-blog.csdn.net/2018060816240518?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NyeXN0YWxTaGF3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70) ## 二,NAL\_TYPE定義 ~~~cpp /** * Table 7-1: NAL unit type codes */enum HEVCNALUnitType { HEVC_NAL_TRAIL_N = 0, HEVC_NAL_TRAIL_R = 1, HEVC_NAL_TSA_N = 2, HEVC_NAL_TSA_R = 3, HEVC_NAL_STSA_N = 4, HEVC_NAL_STSA_R = 5, HEVC_NAL_RADL_N = 6, HEVC_NAL_RADL_R = 7, HEVC_NAL_RASL_N = 8, HEVC_NAL_RASL_R = 9, HEVC_NAL_VCL_N10 = 10, HEVC_NAL_VCL_R11 = 11, HEVC_NAL_VCL_N12 = 12, HEVC_NAL_VCL_R13 = 13, HEVC_NAL_VCL_N14 = 14, HEVC_NAL_VCL_R15 = 15, HEVC_NAL_BLA_W_LP = 16, HEVC_NAL_BLA_W_RADL = 17, HEVC_NAL_BLA_N_LP = 18, HEVC_NAL_IDR_W_RADL = 19, HEVC_NAL_IDR_N_LP = 20, HEVC_NAL_CRA_NUT = 21, HEVC_NAL_IRAP_VCL22 = 22, HEVC_NAL_IRAP_VCL23 = 23, HEVC_NAL_RSV_VCL24 = 24, HEVC_NAL_RSV_VCL25 = 25, HEVC_NAL_RSV_VCL26 = 26, HEVC_NAL_RSV_VCL27 = 27, HEVC_NAL_RSV_VCL28 = 28, HEVC_NAL_RSV_VCL29 = 29, HEVC_NAL_RSV_VCL30 = 30, HEVC_NAL_RSV_VCL31 = 31, HEVC_NAL_VPS = 32, HEVC_NAL_SPS = 33, HEVC_NAL_PPS = 34, HEVC_NAL_AUD = 35, HEVC_NAL_EOS_NUT = 36, HEVC_NAL_EOB_NUT = 37, HEVC_NAL_FD_NUT = 38, HEVC_NAL_SEI_PREFIX = 39, HEVC_NAL_SEI_SUFFIX = 40,}; ~~~ ## 三,實例分析 1,截取一段HEVC視頻碼流 ![](https://img-blog.csdn.net/20180608163732200?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NyeXN0YWxTaGF3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70) 2,elecard對應該段碼流的分析結果。 ![](https://img-blog.csdn.net/20180608163901366?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0NyeXN0YWxTaGF3/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70) 3,具體分析說明: 第一個NALU:0x00000001 NAL起始碼?0x40>>1,0x20,十進制32,為NAL\_VPS(Video Parameter Set視頻參數集)。 第二個NALU:0x00000001 NAL起始碼 0x42>>1,0x21,十進制33,為NAL\_SPS(Sequence Parameter Set序列參數集)。 第三個NALU:0x00000001 NAL起始碼? 0x44 >> 1,0x22,十進制34,為NAL\_PPS(Picture Parameter Set圖像參數集)。 第四個NALU:0x00000001 NAL起始碼 0x4E >> 1,0x27,十進制39,為NAL\_SEI\_PREFIX(Supplemental enhancement information) 第五個NALU:0x00000001 NAL起始碼? 0x26 >> 1,0x13,十進制19, 為NAL\_IDR\_W\_RADL(Instantaneous decoding refresh)
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