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  • x265的官方最新源码
  • x265:x265适用于ClearOS和ffmpeg
  • X265编译

    2019-02-24 14:03:19
    做图像压缩时被要求用x265来对图像编码,做一些测试任务,虽然每天做着一些杂活,但索性还是记录些来吧。 第一步:编译x265 进入x265官网 http://www.x265.org/ ,然后进入 https://bitbucket.org/multicoreware/x265...

    没有科研命,被老师频繁患者方向,每次也都是做着一些杂活,而现在也已经看开了,能让我毕业就行。
    做图像压缩时被要求用x265来对图像编码,做一些测试任务,虽然每天做着一些杂活,但索性还是记录些来吧。
    第一步:编译x265
    进入x265官网 http://www.x265.org/ ,然后进入 https://bitbucket.org/multicoreware/x265 ,有各种系统的编译步骤,下面针对ubuntu:
    命令如下:

    # ubuntu packages:
    $ sudo apt-get install mercurial cmake cmake-curses-gui build-essential yasm
    # Note: if the packaged yasm is older than 1.2, you must download yasm (1.3 recommended) and build it
    # If you are compiling off the default branch after release of v2.6, you must have nasm (2.13 or newer) installed and added to your path
    
    $ hg clone https://bitbucket.org/multicoreware/x265
    $ cd x265/build/linux
    $ ./make-Makefiles.bash
    $ make
    

    我当时在两台机器上编译,有一台直接用上命令一会就装好了,有一台不行,我就分别安装了上述软件。
    第二步:将kodak数据集(png格式)编码成.h265文件
    针对图像,由于x265支持输入是yuv格式,所以首先将png转换成yuv444(无损),作为输入(kodak数据集有24张图片,我开始是一张一张编码,最后又写了一个for循环,稍微有点问题)
    编码命令如下:

    filelist=`ls 存放png文件的路径`   #注意这不是双引号,是tab键上面那个。
    例如:filelist=`ls /home/work/sl/kodak/`
    然后:
    for file in $filelist; do  ./x265  --input-res 768x512 --fps 24 
    /home/work/sl/kodak/$file -o /home/work/sl/h265file/$file.h265; done
    注意,你可以设置量化参数q来设置编码压缩程度,在命令后加 -q 20等,此外,编码后是h265文件,
    我这个for循环有个小问题,保存h265文件的时候,由于file后缀是.yuv,而我没去掉,
    保存的h265文件就成.yuv.h265,如果把.yuv后缀去掉就好了。
    

    为了测试编码文件的psnr,我不得不把h265文件转回yuv444文件。后面的做法有一些问题,所以就不记录了。

    展开全文
  • ffmpeg + x265 + x264

    2017-09-24 00:18:47
    在ffmpeg 中加入x265和x264。通过这个你可以直接使用ffmpep进行x265的转码,我使用的系统是Ubuntu 16.10 ,
  • x265下载安装与配置  研究了这么久的HEVC Test Model(HM),相信大家对x265开源代码的实现与框架早就充满了好奇,接下来的日子,我将把自己入手学习与探索“x265开源代码的实现与框架”的过程记录下来,与大家...

    x265下载安装与配置


            研究了这么久的HEVC Test Model(HM),相信大家对x265开源代码的实现与框架早就充满了好奇,接下来的日子,我将把自己入手学习与探索“x265开源代码的实现与框架”的过程记录下来,与大家共同进步学习。


    1x265下载地址与参考资料



    x265的官网为: http://x265.org/

    x265下载地址: https://bitbucket.org/multicoreware/x265/downloads

    或 http://ftp.videolan.org/pub/videolan/x265/

    或 https://bitbucket.org/multicoreware/x265/src

    x265 Documentation: http://x265.readthedocs.org/en/default/


    2、x265安装与配置


    (注:以下步骤所采用的平台是:Win7 32 bit PC、VS2010)


    Step1:将x265开源代码下载下来;

    (网址:http://download.csdn.net/detail/frd2009041510/9385441



    Step2:下载Cmake(尽量采用高版本);

    (网址:https://cmake.org/download/



    Step3:下载YASM(后续可能会用到。。。。);

    (地址:http://download.csdn.net/detail/frd2009041510/9385752

    下载后只需将“vsyasm.exe”放在:C:\Program Files\Microsoft Visual Studio 10.0\VC\bin即可。



    Step4:编译x265。

            具体步骤如下:

    (1)、进入你的Cmake软件安装包“...\cmake-3.4.1-win32-x86\bin”,双击cmake-gui.exe,出现如下界面;



    2)、选择源码地址与binaries地址,分别为:..\x265_1.8\source...x265_1.8\build\vc10-x86(第二个地址要根据采用的平台选择,我这儿采用的是32PCVS2010),如下图所示;


    3)、点击Configure,出现项目编译器平台选择(根据自己的平台进行选择),如下图;


    4)、点击Configure,完成后界面如下,说明成功;


    5)、点击Generate,界面变为如下图所示说明成功;



    此时进入“...\x265_1.8\build\vc10-x86”,发现多出了很多东西就对了,如下图所示。


    3、“...\x265_1.8\build\vc10-x86”内容变化


    最后,给出“...\x265_1.8\build\vc10-x86”文件夹中的内容在整个过程中的变化:

    (1)、原始内容



    (2)、“Configure”后

    3)、“Generate”后


    大笑大笑

    截至目前,x265平台下载、安装、配置就基本完成了。。。

    大笑大笑

    展开全文
  • x265文档.pdf

    2021-01-19 09:18:42
    x265说明文档
  • X265的文档

    2015-08-25 11:10:47
    X265的文档
  • x265使用基本方法  首先,完成x265的下载安装与配置。 (参考网址:http://blog.csdn.net/frd2009041510/article/details/50446007) 接下来介绍x265编解码视频的基本方法。 第一步:  进入“....

    x265使用基本方法


            首先,完成x265的下载安装与配置。

    (参考网址:http://blog.csdn.net/frd2009041510/article/details/50446007


    接下来介绍x265编解码视频的基本方法。


    第一步:


            进入“...x265_1.8\build\vc10-x86”,双击“build-all.bat”,则进行编译。文件夹中的内容变化如下两图所示。

        

    第二步:


            用VS打开上一步中生成的x265.sln,其具体位置在“...\x265_1.8\build\vc10-x86”(如下图,根据平台选择)


    打开后,VS出现如下界面:


    第三步:


            Build Solution(可以先调为Release模式),Release文件夹下出现编译出来的一些执行文件和库,如下图所示。


    其中,

            x265.exe是可以直接使用的编码H.265的命令行程序

            libx265.dll、libx265.lib是可以用于程序开发的编码H.265的类库(libdll分开)

            x265-static.lib是可以用于程序开发的编码H.265的类库(单独一个lib


    第四步:


            将make-solution.bat拷贝至Release文件夹下,并且拷贝一个YUV420的测试序列至Release文件夹下,如下图所示。


    第五步:


            修改make-solution.bat内容,内容如下(运行的指令将在后续博文中介绍):


    x265 --input-res 352x288 --fps 30 hall_cif_352x288_300.yuv -o hall_cif_352x288_300.h265



    第六步:


            双击make-solution.bat,出现如下界面,说明成功。


    成功过后,会多出一个*.h265的文件,该文件就是h.265格式的视频,如下图所示:


    大笑OK了。

    展开全文
  • x265-1.8版本-x265.h代码注释

    万次阅读 热门讨论 2016-01-29 20:30:01
    x265-1.8版本-x265.h代码注释

    注:问号以及未注释部分 会在x265-1.9版本内更新

    /*****************************************************************************
     * Copyright (C) 2013 x265 project
     *
     * Authors: Steve Borho <steve@borho.org>
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License as published by
     * the Free Software Foundation; either version 2 of the License, or
     * (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
     *
     * This program is also available under a commercial proprietary license.
     * For more information, contact us at license @ x265.com.
     *****************************************************************************/
    
    #ifndef X265_H
    #define X265_H
    
    #include <stdint.h>
    #include "x265_config.h"
    
    #ifdef __cplusplus
    extern "C" {
    #endif
    
    /* x265_encoder:
     *      opaque handler for encoder */
    typedef struct x265_encoder x265_encoder;
    
    /* Application developers planning to link against a shared library version of
     * libx265 from a Microsoft Visual Studio or similar development environment
     * will need to define X265_API_IMPORTS before including this header.
     * This clause does not apply to MinGW, similar development environments, or non
     * Windows platforms. */
    #ifdef X265_API_IMPORTS
    #define X265_API __declspec(dllimport)
    #else
    #define X265_API
    #endif
    //IRAP(Intra Random Access Point)  参考IRAP且在前面的称为前置图像  参考IRAP且在后面的称为后置图像
    //前置图像: RADL(Random Access Decodable Leading)(不依赖IRAP前的帧) RASL(Random Access Skipped Leading)(依赖IRAP前的帧)
    //三种IRAP IDR(Instantaneous Decoding Refresh) CRA(Clean Random Access) BLA(Broken Link Access)
    //IDR 要求前置图像必须是RADL 即 IDR后续帧不依赖IDR前向帧
    //CRA 允许前置图像是RASL(编码效率高) 直接从CRA进入,则其前置图像RASL的不能解码
    //BLA 如果直接从CRA介入,其前置RASL不能解码,则此图像被称为BLA
    //时域号:关键帧号为0 底层不参考高层 最高为6
    //下切换:从任何图像开始,可以丢弃其后(码率顺序)具有更高时域层标识号的图像
    //上切换:从某一图像开始,可以发送具有该图像时域层标示号的图像,而该图像之前发送的图像的时域标示号小于该图像的时域标识号。 要求:从这个图像开始,其所在时域层内的所有图像不依赖该图像之前(码流顺序)相同时域层中的图像
    //TSA(Temporal Sub-layer Access)和 STSA(Step-wise Temporal Sub-layer Access),用于标识时域子层切换点,即从这些图像开始可以进行时域子层上切换
    //STSA:从该图像可以切换到该图像所属的时域层,要求:同一层中后续帧不依赖该图像之前的图像
    //TSA:可以切换到大于或等于该图像时域层的图像
    typedef enum
    {
        NAL_UNIT_CODED_SLICE_TRAIL_N = 0,//未被参考的后置图像,且非TSA、非STSA的视频片段 
        NAL_UNIT_CODED_SLICE_TRAIL_R,    //被参考的后置图像,且非TSA、非STSA的视频片段 
        NAL_UNIT_CODED_SLICE_TSA_N,//未被参考的TSA图像 在时域子层打开的时候有
        NAL_UNIT_CODED_SLICE_TLA_R, //被参考的TSA图像 不应该是TLA??? x265中未使用 
        NAL_UNIT_CODED_SLICE_STSA_N,//不被参考的STSA图像 x265中未使用 
        NAL_UNIT_CODED_SLICE_STSA_R,//被参考的STSA图像   x265中未使用 
        NAL_UNIT_CODED_SLICE_RADL_N,//RADL 前置图像(不依赖IRAP前的帧) 不被参考的前置图像  只在openGOP关闭才会有此类型
        NAL_UNIT_CODED_SLICE_RADL_R,//RADL 前置图像(不依赖IRAP前的帧) 被参考的前置图像    只在openGOP关闭才会有此类型
        NAL_UNIT_CODED_SLICE_RASL_N,//RASL 前置图像(依赖IRAP前的帧)   不被参考的前置图像  只在openGOP打开才会有此类型
        NAL_UNIT_CODED_SLICE_RASL_R,//RASL 前置图像(依赖IRAP前的帧)   被参考的前置图像  只在openGOP打开才会有此类型
        NAL_UNIT_CODED_SLICE_BLA_W_LP = 16,//BLA x265中未使用 未完成
        NAL_UNIT_CODED_SLICE_BLA_W_RADL,//RADL BLA 前置图像(不依赖IRAP前的帧) x265中未使用 未完成
        NAL_UNIT_CODED_SLICE_BLA_N_LP,  //BLA x265中未使用 未完成
        NAL_UNIT_CODED_SLICE_IDR_W_RADL,//RADL IDR 前置图像(不依赖IRAP前的帧) 可能有RADL图像的SS(视频片段)编码数据
        NAL_UNIT_CODED_SLICE_IDR_N_LP,//IDR 未完成
        NAL_UNIT_CODED_SLICE_CRA,//CRA 关键帧 在openGOP时使用
        NAL_UNIT_VPS = 32,
        NAL_UNIT_SPS,
        NAL_UNIT_PPS,
        NAL_UNIT_ACCESS_UNIT_DELIMITER,
        NAL_UNIT_EOS,
        NAL_UNIT_EOB,
        NAL_UNIT_FILLER_DATA,
        NAL_UNIT_PREFIX_SEI,
        NAL_UNIT_SUFFIX_SEI,
        NAL_UNIT_INVALID = 64,
    } NalUnitType;
    
    /* The data within the payload is already NAL-encapsulated; the type is merely
     * in the struct for easy access by the calling application.  All data returned
     * in an x265_nal, including the data in payload, is no longer valid after the
     * next call to x265_encoder_encode.  Thus it must be used or copied before
     * calling x265_encoder_encode again. */
    typedef struct x265_nal
    {
        uint32_t type;        /* NalUnitType */
        uint32_t sizeBytes;   /* size in bytes */
        uint8_t* payload;
    } x265_nal;
    
    /* Stores all analysis data for a single frame */
    typedef struct x265_analysis_data
    {
        void*            interData;
        void*            intraData;
        uint32_t         frameRecordSize;
        uint32_t         poc;
        uint32_t         sliceType;
        uint32_t         numCUsInFrame;
        uint32_t         numPartitions;
    } x265_analysis_data;
    
    /* cu statistics */
    typedef struct x265_cu_stats
    {
        double      percentSkipCu[4];                // Percentage of skip cu in all depths
        double      percentMergeCu[4];               // Percentage of merge cu in all depths
        double      percentIntraDistribution[4][3];  // Percentage of DC, Planar, Angular intra modes in all depths
        double      percentInterDistribution[4][3];  // Percentage of 2Nx2N inter, rect and amp in all depths
        double      percentIntraNxN;                 // Percentage of 4x4 cu
    
        /* All the above values will add up to 100%. */
    } x265_cu_stats;
    
    /* Frame level statistics */
    typedef struct x265_frame_stats
    {
        double           qp;
        double           rateFactor;
        double           psnrY;
        double           psnrU;
        double           psnrV;
        double           psnr;
        double           ssim;
        double           decideWaitTime;
        double           row0WaitTime;
        double           wallTime;
        double           refWaitWallTime;
        double           totalCTUTime;
        double           stallTime;
        double           avgWPP;
        double           avgLumaDistortion;
        double           avgChromaDistortion;
        double           avgPsyEnergy;
        double           avgLumaLevel;
        uint64_t         bits;
        int              encoderOrder;
        int              poc;
        int              countRowBlocks;
        int              list0POC[16];
        int              list1POC[16];
        uint16_t         maxLumaLevel;
        char             sliceType;
        x265_cu_stats    cuStats;
    } x265_frame_stats;
    
    /* Used to pass pictures into the encoder, and to get picture data back out of
     * the encoder.  The input and output semantics are different */
    typedef struct x265_picture
    {
        /* presentation time stamp: user-specified, returned on output */
        int64_t pts;//显示时间戳,在编码器内环里一般就是poc的值,用于标记显示的顺序?
    
        /* display time stamp: ignored on input, copied from reordered pts. Returned
         * on output */
        int64_t dts;
    
        /* force quantizer for != X265_QP_AUTO */
        /* The value provided on input is returned with the same picture (POC) on
         * output */
        void*   userData;
    
        /* Must be specified on input pictures, the number of planes is determined
         * by the colorSpace value */
        void*   planes[3];
    
        /* Stride is the number of bytes between row starts */
        int     stride[3];
    
        /* Must be specified on input pictures. x265_picture_init() will set it to
         * the encoder's internal bit depth, but this field must describe the depth
         * of the input pictures. Must be between 8 and 16. Values larger than 8
         * imply 16bits per input sample. If input bit depth is larger than the
         * internal bit depth, the encoder will down-shift pixels. Input samples
         * larger than 8bits will be masked to internal bit depth. On output the
         * bitDepth will be the internal encoder bit depth */
        int     bitDepth;
    
        /* Must be specified on input pictures: X265_TYPE_AUTO or other.
         * x265_picture_init() sets this to auto, returned on output */
        int     sliceType;
    
        /* Ignored on input, set to picture count, returned on output */
        int     poc;
    
        /* Must be specified on input pictures: X265_CSP_I420 or other. It must
         * match the internal color space of the encoder. x265_picture_init() will
         * initialize this value to the internal color space */
        int     colorSpace;
    
        /* Force the slice base QP for this picture within the encoder. Set to 0
         * to allow the encoder to determine base QP */
        int     forceqp;
    
        /* If param.analysisMode is X265_ANALYSIS_OFF this field is ignored on input
         * and output. Else the user must call x265_alloc_analysis_data() to
         * allocate analysis buffers for every picture passed to the encoder.
         *
         * On input when param.analysisMode is X265_ANALYSIS_LOAD and analysisData
         * member pointers are valid, the encoder will use the data stored here to
         * reduce encoder work.
         *
         * On output when param.analysisMode is X265_ANALYSIS_SAVE and analysisData
         * member pointers are valid, the encoder will write output analysis into
         * this data structure */
        x265_analysis_data analysisData;
    
        /* Frame level statistics */
        x265_frame_stats frameData;
    
    } x265_picture;
    
    typedef enum
    {
        X265_DIA_SEARCH, // 菱形搜索
        X265_HEX_SEARCH, // 六边形搜索
        X265_UMH_SEARCH, // UMH搜索
        X265_STAR_SEARCH,// 星型搜索,与HM中的TZ很像,但是有一些区别
        X265_FULL_SEARCH // 全搜索
    } X265_ME_METHODS;
    
    /* CPU flags */
    
    /* x86 */
    #define X265_CPU_CMOV            0x0000001
    #define X265_CPU_MMX             0x0000002
    #define X265_CPU_MMX2            0x0000004  /* MMX2 aka MMXEXT aka ISSE */
    #define X265_CPU_MMXEXT          X265_CPU_MMX2
    #define X265_CPU_SSE             0x0000008
    #define X265_CPU_SSE2            0x0000010
    #define X265_CPU_SSE3            0x0000020
    #define X265_CPU_SSSE3           0x0000040
    #define X265_CPU_SSE4            0x0000080  /* SSE4.1 */
    #define X265_CPU_SSE42           0x0000100  /* SSE4.2 */
    #define X265_CPU_LZCNT           0x0000200  /* Phenom support for "leading zero count" instruction. */
    #define X265_CPU_AVX             0x0000400  /* AVX support: requires OS support even if YMM registers aren't used. */
    #define X265_CPU_XOP             0x0000800  /* AMD XOP */
    #define X265_CPU_FMA4            0x0001000  /* AMD FMA4 */
    #define X265_CPU_AVX2            0x0002000  /* AVX2 */
    #define X265_CPU_FMA3            0x0004000  /* Intel FMA3 */
    #define X265_CPU_BMI1            0x0008000  /* BMI1 */
    #define X265_CPU_BMI2            0x0010000  /* BMI2 */
    /* x86 modifiers */
    #define X265_CPU_CACHELINE_32    0x0020000  /* avoid memory loads that span the border between two cachelines */
    #define X265_CPU_CACHELINE_64    0x0040000  /* 32/64 is the size of a cacheline in bytes */
    #define X265_CPU_SSE2_IS_SLOW    0x0080000  /* avoid most SSE2 functions on Athlon64 */
    #define X265_CPU_SSE2_IS_FAST    0x0100000  /* a few functions are only faster on Core2 and Phenom */
    #define X265_CPU_SLOW_SHUFFLE    0x0200000  /* The Conroe has a slow shuffle unit (relative to overall SSE performance) */
    #define X265_CPU_STACK_MOD4      0x0400000  /* if stack is only mod4 and not mod16 */
    #define X265_CPU_SLOW_CTZ        0x0800000  /* BSR/BSF x86 instructions are really slow on some CPUs */
    #define X265_CPU_SLOW_ATOM       0x1000000  /* The Atom is terrible: slow SSE unaligned loads, slow
                                                 * SIMD multiplies, slow SIMD variable shifts, slow pshufb,
                                                 * cacheline split penalties -- gather everything here that
                                                 * isn't shared by other CPUs to avoid making half a dozen
                                                 * new SLOW flags. */
    #define X265_CPU_SLOW_PSHUFB     0x2000000  /* such as on the Intel Atom */
    #define X265_CPU_SLOW_PALIGNR    0x4000000  /* such as on the AMD Bobcat */
    
    /* ARM */
    #define X265_CPU_ARMV6           0x0000001
    #define X265_CPU_NEON            0x0000002  /* ARM NEON */
    #define X265_CPU_FAST_NEON_MRC   0x0000004  /* Transfer from NEON to ARM register is fast (Cortex-A9) */
    
    #define X265_MAX_SUBPEL_LEVEL   7
    
    /* Log level */
    #define X265_LOG_NONE          (-1)
    #define X265_LOG_ERROR          0
    #define X265_LOG_WARNING        1
    #define X265_LOG_INFO           2
    #define X265_LOG_DEBUG          3
    #define X265_LOG_FULL           4
    
    #define X265_B_ADAPT_NONE       0
    #define X265_B_ADAPT_FAST       1
    #define X265_B_ADAPT_TRELLIS    2
    
    #define X265_REF_LIMIT_DEPTH    1
    #define X265_REF_LIMIT_CU       2
    
    #define X265_BFRAME_MAX         16
    #define X265_MAX_FRAME_THREADS  16
    
    #define X265_TYPE_AUTO          0x0000  /* Let x265 choose the right type */
    #define X265_TYPE_IDR           0x0001
    #define X265_TYPE_I             0x0002
    #define X265_TYPE_P             0x0003
    #define X265_TYPE_BREF          0x0004  /* Non-disposable B-frame */
    #define X265_TYPE_B             0x0005
    #define IS_X265_TYPE_I(x) ((x) == X265_TYPE_I || (x) == X265_TYPE_IDR)
    #define IS_X265_TYPE_B(x) ((x) == X265_TYPE_B || (x) == X265_TYPE_BREF)
    
    #define X265_QP_AUTO                 0
    
    #define X265_AQ_NONE                 0
    #define X265_AQ_VARIANCE             1
    #define X265_AQ_AUTO_VARIANCE        2
    #define X265_AQ_AUTO_VARIANCE_BIASED 3
    
    /* NOTE! For this release only X265_CSP_I420 and X265_CSP_I444 are supported */
    
    /* Supported internal color space types (according to semantics of chroma_format_idc) */
    #define X265_CSP_I400           0  /* yuv 4:0:0 planar */
    #define X265_CSP_I420           1  /* yuv 4:2:0 planar */
    #define X265_CSP_I422           2  /* yuv 4:2:2 planar */
    #define X265_CSP_I444           3  /* yuv 4:4:4 planar */
    #define X265_CSP_COUNT          4  /* Number of supported internal color spaces */
    
    /* These color spaces will eventually be supported as input pictures. The pictures will
     * be converted to the appropriate planar color spaces at ingest */
    #define X265_CSP_NV12           4  /* yuv 4:2:0, with one y plane and one packed u+v */
    #define X265_CSP_NV16           5  /* yuv 4:2:2, with one y plane and one packed u+v */
    
    /* Interleaved color-spaces may eventually be supported as input pictures */
    #define X265_CSP_BGR            6  /* packed bgr 24bits   */
    #define X265_CSP_BGRA           7  /* packed bgr 32bits   */
    #define X265_CSP_RGB            8  /* packed rgb 24bits   */
    #define X265_CSP_MAX            9  /* end of list */
    
    #define X265_EXTENDED_SAR       255 /* aspect ratio explicitly specified as width:height */
    
    /* Analysis options */
    #define X265_ANALYSIS_OFF  0
    #define X265_ANALYSIS_SAVE 1
    #define X265_ANALYSIS_LOAD 2
    
    typedef struct x265_cli_csp
    {
        int planes;
        int width[3];
        int height[3];
    } x265_cli_csp;
    
    static const x265_cli_csp x265_cli_csps[] =
    {
        { 1, { 0, 0, 0 }, { 0, 0, 0 } }, /* i400 */
        { 3, { 0, 1, 1 }, { 0, 1, 1 } }, /* i420 */
        { 3, { 0, 1, 1 }, { 0, 0, 0 } }, /* i422 */
        { 3, { 0, 0, 0 }, { 0, 0, 0 } }, /* i444 */
        { 2, { 0, 0 },    { 0, 1 } },    /* nv12 */
        { 2, { 0, 0 },    { 0, 0 } },    /* nv16 */
    };
    
    /* rate tolerance method */
    typedef enum
    {
        X265_RC_ABR,//可用比特率(ABR: available bit-rate) 固定码率
        X265_RC_CQP,//固定QP模式
        X265_RC_CRF //CRF就是constant ratefactor,就是保证“一定质量”,智能分配码率。
        //            智能分配码率包含两个意思:
        //           (1)同一帧内分配码率。就是在细节的地方分配更多的字节(bits)。实际效果举例:前景细节保留完整,背景压缩得很厉害。
        //           (2)帧间分配码率。CRF会智能分析哪些是重要帧,哪些是次要帧。重要帧会得到更多的字节。实际效果举例:帧排列:清晰-模糊-模糊-清晰。但是给人的感觉会是比较清晰的,因为看电影的时候一般注意焦点,不会去辨认背景。次要帧一般都一闪而过,也不容易注意到。
        //            main里面的CRF调节是对上面提到的“一定质量”的调节。值18基本为无损,19-21.5为高质量,22-26为中等质量。
    } X265_RC_METHODS;
    
    /*
    ABR 也可以理解为:Average  Bitrate 平均码率
    CBR 也可以理解为:Constant BitRate 固定码率
    VBR 也可以理解为:Variable BitRate 可变速率 简单部分低码率 复杂部分高码率
    CBR(Constant bitrate)即固定码率,就是静态(恒定)比特率的意思,CBR是一种固定采样率的压缩方式。,效果不十分理想,现已逐步被VBR的方式取代。
    固定码率是一个用来形容通信服务质量(QoS,Quality of Service)的术语。一般来说,音视频质量越好,记录音视频的数据量就越多,要求的编码码率就会越高。和该词相对应的词是可变码率或可变比特率(英文Variable Bitrate,缩写VBR)。CBR和VBR都是控制编码器输出码率大小的方法,即码率控制模式。
    对于视频编码来说,CBR编码指的是编码器每秒钟的输出码数据量(或者解码器的输入码率)应该是固定制(常数)。编码器检测每一帧图像的复杂程度,然后计算出码率。如果码率过小,就填充无用数据,使之与指定码率保持一致;如果码率过大,就适当降低码率,也使之与指定码率保持一致。因此,固定码率模式的编码效率比较低。在快速运动画面部分,画面细节较多,一般需要更多的比特来描述,但由于强行降低码率,因此会丢失部分画面的细节信息,而出现画面模糊、不清晰现象。对于音频压缩来说,比如MP3,比特率是最重要的因素,它用来表示每秒钟的音频数据占用了多少个比特,这个值越高,音质就越好。CBR使用固定比特率编码音频,一首MP3从头至尾为某固定值,如128 kbps进行编码。
    总之,无论对于音频编码还是视频编码,CBR方式编码的优点是压缩快,能被大多数软件和设备支持;而且当在一个带宽受限的信道中进行多媒体通讯的时候,CBR是非常有用的,因为这时候受限的是最高码率,CBR可以更好的易用这样的信道。但是缺点是占用空间相对大,不适合进行存储,因为CBR将导致没有足够的码率对复杂的内容部分进行编码,从而导致质量下降,同时在简单的内容部分会浪费一些码率。
    大部分编码方案的输出都是可变长的码字,例如霍夫曼编码或者游程编码(run-length coding),这使得编码器很难做到完美的CBR。编码器可以通过调整量化(进而调整编码质量)来部分的解决这个问题,如果同时使用填充码来完美的达到CBR。(有时候,CBR也指一种非常简单的编码方案,比如将一个16位精度的音频数据流通过抽样得到一个8位精度的数据流)。
    **/
    /* slice type statistics */
    typedef struct x265_sliceType_stats
    {
        double        avgQp;
        double        bitrate;
        double        psnrY;
        double        psnrU;
        double        psnrV;
        double        ssim;
        uint32_t      numPics;
    } x265_sliceType_stats;
    
    /* Output statistics from encoder */
    typedef struct x265_stats
    {
        double                globalPsnrY;
        double                globalPsnrU;
        double                globalPsnrV;
        double                globalPsnr;
        double                globalSsim;
        double                elapsedEncodeTime;    /* wall time since encoder was opened */
        double                elapsedVideoTime;     /* encoded picture count / frame rate */
        double                bitrate;              /* accBits / elapsed video time */
        uint64_t              accBits;              /* total bits output thus far */
        uint32_t              encodedPictureCount;  /* number of output pictures thus far */
        uint32_t              totalWPFrames;        /* number of uni-directional weighted frames used */
        x265_sliceType_stats  statsI;               /* statistics of I slice */
        x265_sliceType_stats  statsP;               /* statistics of P slice */
        x265_sliceType_stats  statsB;               /* statistics of B slice */
    } x265_stats;
    
    /* String values accepted by x265_param_parse() (and CLI) for various parameters */
    static const char * const x265_motion_est_names[] = { "dia", "hex", "umh", "star", "full", 0 };
    static const char * const x265_source_csp_names[] = { "i400", "i420", "i422", "i444", "nv12", "nv16", 0 };
    static const char * const x265_video_format_names[] = { "component", "pal", "ntsc", "secam", "mac", "undef", 0 };
    static const char * const x265_fullrange_names[] = { "limited", "full", 0 };
    static const char * const x265_colorprim_names[] = { "", "bt709", "undef", "", "bt470m", "bt470bg", "smpte170m", "smpte240m", "film", "bt2020", 0 };
    static const char * const x265_transfer_names[] = { "", "bt709", "undef", "", "bt470m", "bt470bg", "smpte170m", "smpte240m", "linear", "log100",
                                                        "log316", "iec61966-2-4", "bt1361e", "iec61966-2-1", "bt2020-10", "bt2020-12",
                                                        "smpte-st-2084", "smpte-st-428", "arib-std-b67", 0 };
    static const char * const x265_colmatrix_names[] = { "GBR", "bt709", "undef", "", "fcc", "bt470bg", "smpte170m", "smpte240m",
                                                         "YCgCo", "bt2020nc", "bt2020c", 0 };
    static const char * const x265_sar_names[] = { "undef", "1:1", "12:11", "10:11", "16:11", "40:33", "24:11", "20:11",
                                                   "32:11", "80:33", "18:11", "15:11", "64:33", "160:99", "4:3", "3:2", "2:1", 0 };
    static const char * const x265_interlace_names[] = { "prog", "tff", "bff", 0 };
    static const char * const x265_analysis_names[] = { "off", "save", "load", 0 };
    
    /* Zones: override ratecontrol for specific sections of the video.
     * If zones overlap, whichever comes later in the list takes precedence. */
    typedef struct x265_zone //存储空间在param类中
    {
        int   startFrame, endFrame;//起始与最后帧(标号只当前在RC中的帧数从1开始计数) /* range of frame numbers */
        int   bForceQp;            //是否用固定qp 1用固定qp 2不用 /* whether to use qp vs bitrate factor */
        int   qp;                  //配置qp 用途:当前qp
        float bitrateFactor;       //配置码率因子 用途:当前qscale 除以 bitrateFactor
    } x265_zone;
        
    /* x265 input parameters
     *
     * For version safety you may use x265_param_alloc/free() to manage the
     * allocation of x265_param instances, and x265_param_parse() to assign values
     * by name.  By never dereferencing param fields in your own code you can treat
     * x265_param as an opaque data structure */
    typedef struct x265_param
    {
        /* x265_param_default() will auto-detect this cpu capability bitmap.  it is
         * recommended to not change this value unless you know the cpu detection is
         * somehow flawed on your target hardware. The asm function tables are
         * process global, the first encoder configures them for all encoders */
        int       cpuid;
    
        /*== Parallelism Features ==*/
    
        /* Number of concurrently encoded frames between 1 and X265_MAX_FRAME_THREADS
         * or 0 for auto-detection. By default x265 will use a number of frame
         * threads empirically determined to be optimal for your CPU core count,
         * between 2 and 6.  Using more than one frame thread causes motion search
         * in the down direction to be clamped but otherwise encode behavior is
         * unaffected. With CQP rate control the output bitstream is deterministic
         * for all values of frameNumThreads greater than 1. All other forms of
         * rate-control can be negatively impacted by increases to the number of
         * frame threads because the extra concurrency adds uncertainty to the
         * bitrate estimations. Frame parallelism is generally limited by the the
         * is generally limited by the the number of CU rows
         *
         * When thread pools are used, each frame thread is assigned to a single
         * pool and the frame thread itself is given the node affinity of its pool.
         * But when no thread pools are used no node affinity is assigned. */
        int       frameNumThreads;//同时几个frame编码,0:自动检测(根据内核数) 1 ~ X265_MAX_FRAME_THREADS 表示有几个同时编码 ,默认为内核数
    
        /* Comma seperated list of threads per NUMA node. If "none", then no worker
         * pools are created and only frame parallelism is possible. If NULL or ""
         * (default) x265 will use all available threads on each NUMA node.
         *
         * '+'  is a special value indicating all cores detected on the node
         * '*'  is a special value indicating all cores detected on the node and all
         *      remaining nodes.
         * '-'  is a special value indicating no cores on the node, same as '0'
         *
         * example strings for a 4-node system:
         *   ""        - default, unspecified, all numa nodes are used for thread pools
         *   "*"       - same as default
         *   "none"    - no thread pools are created, only frame parallelism possible
         *   "-"       - same as "none"
         *   "10"      - allocate one pool, using up to 10 cores on node 0
         *   "-,+"     - allocate one pool, using all cores on node 1
         *   "+,-,+"   - allocate two pools, using all cores on nodes 0 and 2
         *   "+,-,+,-" - allocate two pools, using all cores on nodes 0 and 2
         *   "-,*"     - allocate three pools, using all cores on nodes 1, 2 and 3
         *   "8,8,8,8" - allocate four pools with up to 8 threads in each pool
         *
         * The total number of threads will be determined by the number of threads
         * assigned to all nodes. The worker threads will each be given affinity for
         * their node, they will not be allowed to migrate between nodes, but they
         * will be allowed to move between CPU cores within their node.
         *
         * If the three pool features: bEnableWavefront, bDistributeModeAnalysis and
         * bDistributeMotionEstimation are all disabled, then numaPools is ignored
         * and no thread pools are created.
         *
         * If "none" is specified, then all three of the thread pool features are
         * implicitly disabled.
         *
         * Multiple thread pools will be allocated for any NUMA node with more than
         * 64 logical CPU cores. But any given thread pool will always use at most
         * one NUMA node.
         *
         * Frame encoders are distributed between the available thread pools, and
         * the encoder will never generate more thread pools than frameNumThreads */
        const char* numaPools;
    
        /* Enable wavefront parallel processing, greatly increases parallelism for
         * less than 1% compression efficiency loss. Requires a thread pool, enabled
         * by default */
        int       bEnableWavefront; // 波前并行处理 (Wavefront Parallel Processing,WPP) 默认打开(行并行)
    
        /* Use multiple threads to measure CU mode costs. Recommended for many core
         * CPUs. On RD levels less than 5, it may not offload enough work to warrant
         * the overhead. It is useful with the slow preset since it has the
         * rectangular predictions enabled. At RD level 5 and 6 (preset slower and
         * below), this feature should be an unambiguous win if you have CPU
         * cores available for work. Default disabled */
        int       bDistributeModeAnalysis;
    
        /* Use multiple threads to perform motion estimation to (ME to one reference
         * per thread). Recommended for many core CPUs. The more references the more
         * motion searches there will be to distribute. This option is often not a
         * win, particularly in video sequences with low motion. Default disabled */
        int       bDistributeMotionEstimation;
    
        /*== Logging Features ==*/
    
        /* Enable analysis and logging distribution of CUs. Now deprecated */
        int       bLogCuStats;
    
        /* Enable the measurement and reporting of PSNR. Default is enabled */
        int       bEnablePsnr;
    
        /* Enable the measurement and reporting of SSIM. Default is disabled */
        int       bEnableSsim;
    
        /* The level of logging detail emitted by the encoder. X265_LOG_NONE to
         * X265_LOG_FULL, default is X265_LOG_INFO */
        int       logLevel;
    
        /* Filename of CSV log. Now deprecated */
        const char* csvfn;
    
        /*== Internal Picture Specification ==*/
    
        /* Internal encoder bit depth. If x265 was compiled to use 8bit pixels
         * (HIGH_BIT_DEPTH=0), this field must be 8, else this field must be 10.
         * Future builds may support 12bit pixels. */
        int       internalBitDepth;//像素位宽 8 10 12   默认值为8
    
        /* Color space of internal pictures, must match color space of input
         * pictures */
        int       internalCsp;//图像格式  默认为420
    
        /* Numerator and denominator of frame rate */
        uint32_t  fpsNum; //配置的fps信息  必须配置 值一般等于fps*1000
        uint32_t  fpsDenom;//用于fps精度控制 一般等于1000
    
        /* Width (in pixels) of the source pictures. If this width is not an even
         * multiple of 4, the encoder will pad the pictures internally to meet this
         * minimum requirement. All valid HEVC widths are supported */
        int       sourceWidth; //源图像的宽度
    
        /* Height (in pixels) of the source pictures. If this height is not an even
         * multiple of 4, the encoder will pad the pictures internally to meet this
         * minimum requirement. All valid HEVC heights are supported */
        int       sourceHeight;//源图像的高度
    
        /* Interlace type of source pictures. 0 - progressive pictures (default).
         * 1 - top field first, 2 - bottom field first. HEVC encodes interlaced
         * content as fields, they must be provided to the encoder in the correct
         * temporal order */
        int       interlaceMode;//场编码: 默认为0 (非场编码) 1顶场 2底场
    
        /* Total Number of frames to be encoded, calculated from the user input
         * (--frames) and (--seek). In case, the input is read from a pipe, this can
         * remain as 0. It is later used in 2 pass RateControl, hence storing the
         * value in param */
        int       totalFrames;//编码的总帧数  配置方式 --total-frames 或者 -f
    
        /*== Profile / Tier / Level ==*/
    
        /* Note: the profile is specified by x265_param_apply_profile() */
    
        /* Minimum decoder requirement level. Defaults to 0, which implies auto-
         * detection by the encoder. If specified, the encoder will attempt to bring
         * the encode specifications within that specified level. If the encoder is
         * unable to reach the level it issues a warning and emits the actual
         * decoder requirement. If the requested requirement level is higher than
         * the actual level, the actual requirement level is signaled. The value is
         * an specified as an integer with the level times 10, for example level
         * "5.1" is specified as 51, and level "5.0" is specified as 50. */
        int       levelIdc;
    
        /* if levelIdc is specified (non-zero) this flag will differentiate between
         * Main (0) and High (1) tier. Default is Main tier (0) */
        int       bHighTier;//是否采用HIGH层次  默认为MAIN层次
    
        /* The maximum number of L0 references a P or B slice may use. This
         * influences the size of the decoded picture buffer. The higher this
         * number, the more reference frames there will be available for motion
         * search, improving compression efficiency of most video at a cost of
         * performance. Value must be between 1 and 16, default is 3 */
        int       maxNumReferences;   //L0可以取的最大参考帧个数 取值范围(1~16,默认为3)
    
        /* Allow libx265 to emit HEVC bitstreams which do not meet strict level
         * requirements. Defaults to false */
        int       bAllowNonConformance;
    
        /*== Bitstream Options ==*/
    
        /* Flag indicating whether VPS, SPS and PPS headers should be output with
         * each keyframe. Default false */
        int       bRepeatHeaders;//是否将VPS SPS PPS 在每一个关键帧中都写入  默认为false
    
        /* Flag indicating whether the encoder should generate start codes (Annex B
         * format) or length (file format) before NAL units. Default true, Annex B.
         * Muxers should set this to the correct value */
        int       bAnnexB;
    
        /* Flag indicating whether the encoder should emit an Access Unit Delimiter
         * NAL at the start of every access unit. Default false */
        int       bEnableAccessUnitDelimiters;//分解符???????
    
        /* Enables the buffering period SEI and picture timing SEI to signal the HRD
         * parameters. Default is disabled */
        int       bEmitHRDSEI;
    
        /* Enables the emission of a user data SEI with the stream headers which
         * describes the encoder version, build info, and parameters. This is
         * very helpful for debugging, but may interfere with regression tests. 
         * Default enabled */
        int       bEmitInfoSEI;
    
        /* Enable the generation of SEI messages for each encoded frame containing
         * the hashes of the three reconstructed picture planes. Most decoders will
         * validate those hashes against the reconstructed images it generates and
         * report any mismatches. This is essentially a debugging feature.  Hash
         * types are MD5(1), CRC(2), Checksum(3).  Default is 0, none */
        int       decodedPictureHashSEI;
    
        /* Enable Temporal Sub Layers while encoding, signals NAL units of coded
         * slices with their temporalId. Output bitstreams can be extracted either
         * at the base temporal layer (layer 0) with roughly half the frame rate or
         * at a higher temporal layer (layer 1) that decodes all the frames in the
         * sequence. */
        int       bEnableTemporalSubLayers;//是否应用时域子层????
    
        /*== GOP structure and slice type decisions (lookahead) ==*/
    
        /* Enable open GOP - meaning I slices are not necessarily IDR and thus frames
         * encoded after an I slice may reference frames encoded prior to the I
         * frame which have remained in the decoded picture buffer.  Open GOP
         * generally has better compression efficiency and negligible encoder
         * performance impact, but the use case may preclude it.  Default true */
        int       bOpenGOP;  //打开表示,除第一帧为 X265_TYPE_IDR外,其它I帧为 X265_TYPE_I,打开可以提高压缩率,但是要保留前一个I帧,目的是可以获取当前I帧(IDR无须参考任何帧,I帧可能参考其它I帧)
                             //关闭表示,全部I帧都为IDR帧  默认为打开,但是打开不适用随机访问
                             //打开即其关键帧为CAR 不同CVS(GOP)可以相互参考 关闭为IDR(不同GOP不相互参考)
                             //打开情况:编码顺序。I帧后可能有小于I帧号的帧(RDSL) 关闭情况:I帧后的帧号一定大于I帧
        /* Scene cuts closer together than this are coded as I, not IDR. */
        int       keyframeMin;//默认为fps长度(如果keyframeMax/10 小于fps 则等于keyframeMax/10) 
                              //功能一:最小IDR帧间隔,如果当前判断为I帧并且距离上一IDR帧大于此值,则将其置为IDR帧
                              //功能二:场景切换判断,值越小越容易判断为场景切换,编码I帧的概率越大
        /* Maximum keyframe distance or intra period in number of frames. If 0 or 1,
         * all frames are I frames. A negative value is casted to MAX_INT internally
         * which effectively makes frame 0 the only I frame. Default is 250 */
        int       keyframeMax;   //标记相邻两个关键帧(IDR帧)的最大间隔
    
        /* Maximum consecutive B frames that can be emitted by the lookahead. When
         * b-adapt is 0 and keyframMax is greater than bframes, the lookahead emits
         * a fixed pattern of `bframes` B frames between each P.  With b-adapt 1 the
         * lookahead ignores the value of bframes for the most part.  With b-adapt 2
         * the value of bframes determines the search (POC) distance performed in
         * both directions, quadratically increasing the compute load of the
         * lookahead.  The higher the value, the more B frames the lookahead may
         * possibly use consecutively, usually improving compression. Default is 3,
         * maximum is 16 */
        int       bframes; //一个GOP中的连续B帧的最大个数,默认为3,最大为16
    
        /* Sets the operating mode of the lookahead.  With b-adapt 0, the GOP
         * structure is fixed based on the values of keyframeMax and bframes.
         * With b-adapt 1 a light lookahead is used to chose B frame placement.
         * With b-adapt 2 (trellis) a viterbi B path selection is performed */
        int       bFrameAdaptive;  //B帧决策 默认为2。如果为0,固定B帧位置,如果为1快速决定B帧位置, 如果为2比较精细的决定B帧位置
    
        /* When enabled, the encoder will use the B frame in the middle of each
         * mini-GOP larger than 2 B frames as a motion reference for the surrounding
         * B frames.  This improves compression efficiency for a small performance
         * penalty.  Referenced B frames are treated somewhere between a B and a P
         * frame by rate control.  Default is enabled. */
        int       bBPyramid;       //是否有B帧参考 开:有B 关:无B ,默认打开.注意 B:表示可以参考的B帧, b表示不可以参考的b帧, 关闭此开关,只拥有b
    
        /* A value which is added to the cost estimate of B frames in the lookahead.
         * It may be a positive value (making B frames appear more expensive, which
         * causes the lookahead to chose more P frames) or negative, which makes the
         * lookahead chose more B frames. Default is 0, there are no limits */
        int       bFrameBias;     //设置B帧权重 默认值为0 取值范围(-90,100) 值越大B帧权重越高 score = score * 100 / (130 + param->bFrameBias)   CostEstimateGroup::estimateFrameCost
    
        /* The number of frames that must be queued in the lookahead before it may
         * make slice decisions. Increasing this value directly increases the encode
         * latency. The longer the queue the more optimally the lookahead may make
         * slice decisions, particularly with b-adapt 2. When cu-tree is enabled,
         * the length of the queue linearly increases the effectiveness of the
         * cu-tree analysis. Default is 40 frames, maximum is 250 */
        int       lookaheadDepth;
    
        /* Use multiple worker threads to measure the estimated cost of each frame
         * within the lookahead. When bFrameAdaptive is 2, most frame cost estimates
         * will be performed in batch mode, many cost estimates at the same time,
         * and lookaheadSlices is ignored for batched estimates. The effect on
         * performance can be quite small.  The higher this parameter, the less
         * accurate the frame costs will be (since context is lost across slice
         * boundaries) which will result in less accurate B-frame and scene-cut
         * decisions. Default is 0 - disabled. 1 is the same as 0. Max 16 */
        int       lookaheadSlices;  //配置在lookachead可以多条slice并行操作,默认为0, 并行可能引起性能损失
    
        /* An arbitrary threshold which determines how aggressively the lookahead
         * should detect scene cuts. The default (40) is recommended. */
        int       scenecutThreshold; //场景切换的阈值: 值越大越容易判断为场景切换,编码I帧的概率越大
    
        /*== Coding Unit (CU) definitions ==*/
    
        /* Maximum CU width and height in pixels.  The size must be 64, 32, or 16.
         * The higher the size, the more efficiently x265 can encode areas of low
         * complexity, greatly improving compression efficiency at large
         * resolutions.  The smaller the size, the more effective wavefront and
         * frame parallelism will become because of the increase in rows. default 64
         * All encoders within the same process must use the same maxCUSize, until
         * all encoders are closed and x265_cleanup() is called to reset the value. */
        uint32_t  maxCUSize;//最大的CU大小
    
        /* Minimum CU width and height in pixels.  The size must be 64, 32, 16, or
         * 8. Default 8. All encoders within the same process must use the same
         * minCUSize. */
        uint32_t  minCUSize;
    
        /* Enable rectangular motion prediction partitions (vertical and
         * horizontal), available at all CU depths from 64x64 to 8x8. Default is
         * disabled */
        int       bEnableRectInter;
    
        /* Enable asymmetrical motion predictions.  At CU depths 64, 32, and 16, it
         * is possible to use 25%/75% split partitions in the up, down, right, left
         * directions. For some material this can improve compression efficiency at
         * the cost of extra analysis. bEnableRectInter must be enabled for this
         * feature to be used. Default disabled */
        int       bEnableAMP;
    
        /*== Residual Quadtree Transform Unit (TU) definitions ==*/
    
        /* Maximum TU width and height in pixels.  The size must be 32, 16, 8 or 4.
         * The larger the size the more efficiently the residual can be compressed
         * by the DCT transforms, at the expense of more computation */
        uint32_t  maxTUSize;
    
        /* The additional depth the residual quad-tree is allowed to recurse beyond
         * the coding quad-tree, for inter coded blocks. This must be between 1 and
         * 4. The higher the value the more efficiently the residual can be
         * compressed by the DCT transforms, at the expense of much more compute */
        uint32_t  tuQTMaxInterDepth;
    
        /* The additional depth the residual quad-tree is allowed to recurse beyond
         * the coding quad-tree, for intra coded blocks. This must be between 1 and
         * 4. The higher the value the more efficiently the residual can be
         * compressed by the DCT transforms, at the expense of much more compute */
        uint32_t  tuQTMaxIntraDepth;
    
        /* Set the amount of rate-distortion analysis to use within quant. 0 implies
         * no rate-distortion optimization. At level 1 rate-distortion cost is used to
         * find optimal rounding values for each level (and allows psy-rdoq to be
         * enabled). At level 2 rate-distortion cost is used to make decimate decisions
         * on each 4x4 coding group (including the cost of signaling the group within
         * the group bitmap).  Psy-rdoq is less effective at preserving energy when
         * RDOQ is at level 2 */
        int       rdoqLevel;
    
        /* Enable the implicit signaling of the sign bit of the last coefficient of
         * each transform unit. This saves one bit per TU at the expense of figuring
         * out which coefficient can be toggled with the least distortion.
         * Default is enabled */
        int       bEnableSignHiding;
    
        /* Allow intra coded blocks to be encoded directly as residual without the
         * DCT transform, when this improves efficiency. Checking whether the block
         * will benefit from this option incurs a performance penalty. Default is
         * disabled */
        int       bEnableTransformSkip;
    
        /* An integer value in range of 0 to 2000, which denotes strength of noise
         * reduction in intra CUs. 0 means disabled */
        int       noiseReductionIntra;//intra变换域去噪强度 值越大 去噪强度越大 0 不去噪 取值范围:0~2000 默认为0 --nr-intra xxx配置
    
        /* An integer value in range of 0 to 2000, which denotes strength of noise
         * reduction in inter CUs. 0 means disabled */
        int       noiseReductionInter;//inter变换域去噪强度 值越大 去噪强度越大 0 不去噪 取值范围:0~2000 默认为0 --nr-inter xxx配置
    
        /* Quantization scaling lists. HEVC supports 6 quantization scaling lists to
         * be defined; one each for Y, Cb, Cr for intra prediction and one each for
         * inter prediction.
         *
         * - NULL and "off" will disable quant scaling (default)
         * - "default" will enable the HEVC default scaling lists, which
         *   do not need to be signaled since they are specified
         * - all other strings indicate a filename containing custom scaling lists
         *   in the HM format. The encode will fail if the file is not parsed
         *   correctly. Custom lists must be signaled in the SPS. */
        const char *scalingLists;// 是否使用量化矩阵, 默认不使用 通过--scaling-list xxx配置, xxx可以为空或者"off" 表示不适用量化矩阵  "default" 为模式使用HEVC设置的量化矩阵 其它给出一个文件名,来解析量化矩阵
    
        /*== Intra Coding Tools ==*/
    
        /* Enable constrained intra prediction. This causes intra prediction to
         * input samples that were inter predicted. For some use cases this is
         * believed to me more robust to stream errors, but it has a compression
         * penalty on P and (particularly) B slices. Defaults to disabled */
        int       bEnableConstrainedIntra;//表示帧内预测是否受限,即是否允许使用采用帧间预测模式的邻近块信息进行帧内预测  默认否(不受限制)
    
        /* Enable strong intra smoothing for 32x32 blocks where the reference
         * samples are flat. It may or may not improve compression efficiency,
         * depending on your source material. Defaults to disabled */
        int       bEnableStrongIntraSmoothing;//当前intra参考像素是否需要强滤波
    
        /*== Inter Coding Tools ==*/
    
        /* The maximum number of merge candidates that are considered during inter
         * analysis.  This number (between 1 and 5) is signaled in the stream
         * headers and determines the number of bits required to signal a merge so
         * it can have significant trade-offs. The smaller this number the higher
         * the performance but the less compression efficiency. Default is 3 */
        uint32_t  maxNumMergeCand;//Merge选择的候选个数,默认值为3
    
        /* Limit the motion references used for each search based on the results of
         * previous motion searches already performed for the same CU: If 0 all
         * references are always searched. If X265_REF_LIMIT_CU all motion searches
         * will restrict themselves to the references selected by the 2Nx2N search
         * at the same depth. If X265_REF_LIMIT_DEPTH the 2Nx2N motion search will
         * only use references that were selected by the best motion searches of the
         * 4 split CUs at the next lower CU depth.  The two flags may be combined */
        uint32_t  limitReferences;
    
        /* ME search method (DIA, HEX, UMH, STAR, FULL). The search patterns
         * (methods) are sorted in increasing complexity, with diamond being the
         * simplest and fastest and full being the slowest.  DIA, HEX, and UMH were
         * adapted from x264 directly. STAR is an adaption of the HEVC reference
         * encoder's three step search, while full is a naive exhaustive search. The
         * default is the star search, it has a good balance of performance and
         * compression efficiency */
        int       searchMethod;
    
        /* A value between 0 and X265_MAX_SUBPEL_LEVEL which adjusts the amount of
         * effort performed during sub-pel refine. Default is 5 */
        int       subpelRefine;
    
        /* The maximum distance from the motion prediction that the full pel motion
         * search is allowed to progress before terminating. This value can have an
         * effect on frame parallelism, as referenced frames must be at least this
         * many rows of reconstructed pixels ahead of the referencee at all times.
         * (When considering reference lag, the motion prediction must be ignored
         * because it cannot be known ahead of time).  Default is 60, which is the
         * default max CU size (64) minus the luma HPEL half-filter length (4). If a
         * smaller CU size is used, the search range should be similarly reduced */
        int       searchRange;
    
        /* Enable availability of temporal motion vector for AMVP, default is enabled */
        int       bEnableTemporalMvp;
    
        /* Enable weighted prediction in P slices.  This enables weighting analysis
         * in the lookahead, which influences slice decisions, and enables weighting
         * analysis in the main encoder which allows P reference samples to have a
         * weight function applied to them prior to using them for motion
         * compensation.  In video which has lighting changes, it can give a large
         * improvement in compression efficiency. Default is enabled */
        int       bEnableWeightedPred;  //是否应用加权P帧 (默认打开) 在亮度渐变场景中有帮助
    
        /* Enable weighted prediction in B slices. Default is disabled */
        int       bEnableWeightedBiPred; //是否应用加权B帧  默认关闭
    
        /*== Loop Filters ==*/
    
        /* Enable the deblocking loop filter, which improves visual quality by
         * reducing blocking effects at block edges, particularly at lower bitrates
         * or higher QP. When enabled it adds another CU row of reference lag,
         * reducing frame parallelism effectiveness. Default is enabled */
        int       bEnableLoopFilter;
    
        /* deblocking filter tC offset [-6, 6] -6 light filter, 6 strong.
         * This is the coded div2 value, actual offset is doubled at use */
        int       deblockingFilterTCOffset;
    
        /* deblocking filter Beta offset [-6, 6] -6 light filter, 6 strong
         * This is the coded div2 value, actual offset is doubled at use */
        int       deblockingFilterBetaOffset;
    
        /* Enable the Sample Adaptive Offset loop filter, which reduces distortion
         * effects by adjusting reconstructed sample values based on histogram
         * analysis to better approximate the original samples. When enabled it adds
         * a CU row of reference lag, reducing frame parallelism effectiveness.
         * Default is enabled */
        int       bEnableSAO;//是否开启SAO --sao
    
        /* Note: when deblocking and SAO are both enabled, the loop filter CU lag is
         * only one row, as they operate in series on the same row. */
    
        /* Select the method in which SAO deals with deblocking boundary pixels.  If
         * disabled the right and bottom boundary areas are skipped. If enabled,
         * non-deblocked pixels are used entirely. Default is disabled */
        int       bSaoNonDeblocked;//????
    
        /*== Analysis tools ==*/
    
        /* A value between X265_NO_RDO_NO_RDOQ and X265_RDO_LEVEL which determines
         * the level of rate distortion optimizations to perform during mode
         * decisions and quantization. The more RDO the better the compression
         * efficiency at a major cost of performance. Default is no RDO (0) */
        int       rdLevel;
    
        /* Enable early skip decisions to avoid intra and inter analysis in likely
         * skip blocks. Default is disabled */
        int       bEnableEarlySkip;
    
        /* Use a faster search method to find the best intra mode. Default is 0 */
        int       bEnableFastIntra;
    
        /* Enable a faster determination of whether skipping the DCT transform will
         * be beneficial. Slight performance gain for some compression loss. Default
         * is enabled */
        int       bEnableTSkipFast;
    
        /* The CU Lossless flag, when enabled, compares the rate-distortion costs
         * for normal and lossless encoding, and chooses the best mode for each CU.
         * If lossless mode is chosen, the cu-transquant-bypass flag is set for that
         * CU */
        int       bCULossless;//是否对CU尝试无损压缩模式 默认关闭 如果选择无损压缩模式 则当前CU  cu-transquant-bypass 会标记为true
    
        /* Specify whether to attempt to encode intra modes in B frames. By default
         * enabled, but only applicable for the presets which use rdLevel 5 or 6
         * (veryslow and placebo). All other presets will not try intra in B frames
         * regardless of this setting */
        int       bIntraInBFrames;
    
        /* Apply an optional penalty to the estimated cost of 32x32 intra blocks in
         * non-intra slices. 0 is disabled, 1 enables a small penalty, and 2 enables
         * a full penalty. This favors inter-coding and its low bitrate over
         * potential increases in distortion, but usually improves performance.
         * Default is 0 */
        int       rdPenalty;
    
        /* Psycho-visual rate-distortion strength. Only has an effect in presets
         * which use RDO. It makes mode decision favor options which preserve the
         * energy of the source, at the cost of lost compression. The value must
         * be between 0 and 2.0, 1.0 is typical. Default 0.3 */
        double    psyRd;//??? 默认值为0.3
    
        /* Strength of psycho-visual optimizations in quantization. Only has an
         * effect in presets which use RDOQ (rd-levels 4 and 5).  The value must be
         * between 0 and 50, 1.0 is typical. Default 1.0 */
        double    psyRdoq;//??? 默认为0.0 slow到placebo档次 为1.0  tune psnr ssim 为0.0 --psy-rdoq xx配置 tune grain 为10.0
    
        /* If X265_ANALYSIS_SAVE, write per-frame analysis information into analysis
         * buffers.  if X265_ANALYSIS_LOAD, read analysis information into analysis
         * buffer and use this analysis information to reduce the amount of work
         * the encoder must perform. Default X265_ANALYSIS_OFF */
        int       analysisMode;
    
        /* Filename for analysisMode save/load. Default name is "x265_analysis.dat" */
        const char* analysisFileName;
    
        /*== Rate Control ==*/
    
        /* The lossless flag enables true lossless coding, bypassing scaling,
         * transform, quantization and in-loop filter processes. This is used for
         * ultra-high bitrates with zero loss of quality. It implies no rate control */
        int       bLossless; //无损压缩 量化参数固定为4 没有码率控制(有PB帧)  默认关闭 配置:--[no-]lossless 
    
        /* Generally a small signed integer which offsets the QP used to quantize
         * the Cb chroma residual (delta from luma QP specified by rate-control).
         * Default is 0, which is recommended */
        int       cbQpOffset;//cb量化参数相对于亮度量化参数的偏移 默认为0
    
        /* Generally a small signed integer which offsets the QP used to quantize
         * the Cr chroma residual (delta from luma QP specified by rate-control).
         * Default is 0, which is recommended */
        int       crQpOffset;//cr量化参数相对于亮度量化参数的偏移 默认为0
    
        struct
        {
            /* Explicit mode of rate-control, necessary for API users. It must
             * be one of the X265_RC_METHODS enum values. */
            int       rateControlMode;//码流控制方式:CRF ABR QP  --crf <> 配置crf  --bitrate <> 配置ABR  --qp <> 配置固定QP格式  默认为CRF
    
            /* Base QP to use for Constant QP rate control. Adaptive QP may alter
             * the QP used for each block. If a QP is specified on the command line
             * CQP rate control is implied. Default: 32 */
            int       qp;//配置的固定QP 默认值为32  -q 配置  (P帧的QP)   Pqp = qp    Iqp = Pqp - ipoffset   bqp = Pqp + pboffset  Bqp(可参考B帧)= (bqp + pqp)/2
    
            /* target bitrate for Average BitRate (ABR) rate control. If a non- zero
             * bitrate is specified on the command line, ABR is implied. Default 0 */
            int       bitrate;
    
            /* qComp sets the quantizer curve compression factor. It weights the frame
             * quantizer based on the complexity of residual (measured by lookahead).
             * Default value is 0.6. Increasing it to 1 will effectively generate CQP */
            double    qCompress; //强度系数:如果为1.0 则 qpCuTreeOffset  = qpAqOffset   qCompress越大  qpCuTreeOffset越大   默认值:0.6
    
            /* QP offset between I/P and P/B frames. Default ipfactor: 1.4
             * Default pbFactor: 1.3 */
            double    ipFactor;//用途:I帧与P帧的qscale关系  P = Iqscale * m_param->rc.ipFactor 默认 1.4
            double    pbFactor;//用途: B帧与P帧的qscale关系  B = Pqscale * m_param->rc.pbFactor  默认 1.3
    
            /* Ratefactor constant: targets a certain constant "quality".
             * Acceptable values between 0 and 51. Default value: 28 */
            double    rfConstant;//???在CRF模式中应用 一种统一质量的等级 范围在(0~51) 值越小 质量越好 默认为28 --crf <>
    
            /* Max QP difference between frames. Default: 4 */
            int       qpStep;//两帧见最大的QP差  --qpstep 配置  默认值为4
    
            /* Enable adaptive quantization. This mode distributes available bits between all
             * CTUs of a frame, assigning more bits to low complexity areas. Turning
             * this ON will usually affect PSNR negatively, however SSIM and visual quality
             * generally improves. Default: X265_AQ_VARIANCE */
            int       aqMode; //自适应量化 默认打开,一般打开对psnr有损失,但是对ssim和主观质量优增益,选择一下几个值,默认为1
                              //#define X265_AQ_NONE                 0
                              //#define X265_AQ_VARIANCE             1
                              //#define X265_AQ_AUTO_VARIANCE        2
                              //X265_AQ_AUTO_VARIANCE_BIASED         3
    
            /* Sets the strength of AQ bias towards low detail CTUs. Valid only if
             * AQ is enabled. Default value: 1.0. Acceptable values between 0.0 and 3.0 */
            double    aqStrength;//自适应量化的强度  取值范围(0.0~3.0) 默认为1.0 
                                 //固定QP X265_RC_CQP 、aqMode关闭、tune psnr 都会使其关闭
    
    
            /* Sets the maximum rate the VBV buffer should be assumed to refill at
             * Default is zero */
            int       vbvMaxBitrate;//最大的bits值,默认值为0  CBR规定encoder的输出码率为恒定,但是各帧编码后的大小不是固定的(I,B,P帧的存在),因此需要在encoder后面加入VBV buffer。
            //                        Video Buffer Verifier (VBV)是一个当输入码流遵从MPEG标准时,既不会上溢出,也不会下溢出的理论上的解码缓冲器模型。
    
            /* Sets the size of the VBV buffer in kilobits. Default is zero */
            int       vbvBufferSize;// 默认值为0 Video Buffering Verifier 视频缓存检验器
    
            /* Sets how full the VBV buffer must be before playback starts. If it is less than
             * 1, then the initial fill is vbv-init * vbvBufferSize. Otherwise, it is
             * interpreted as the initial fill in kbits. Default is 0.9 */
            double    vbvBufferInit;//???
    
            /* Enable CUTree rate-control. This keeps track of the CUs that propagate temporally
             * across frames and assigns more bits to these CUs. Improves encode efficiency.
             * Default: enabled */
            int       cuTree;//如果当前可参考帧中的块的传播cost比较大,分配其更多的bits  默认:打开
    
            /* In CRF mode, maximum CRF as caused by VBV. 0 implies no limit */
            double    rfConstantMax; //CRF 模式下配置的最大 crf值  默认为0
    
            /* In CRF mode, minimum CRF as caused by VBV */
            double    rfConstantMin;//CRF 模式下配置的最小 crf值  默认为0 --crf-min <float> 
    
            /* Multi-pass encoding */
            /* Enable writing the stats in a multi-pass encode to the stat output file */
            int       bStatWrite;
    
            /* Enable loading data from the stat input file in a multi pass encode */
            int       bStatRead;
    
            /* Filename of the 2pass output/input stats file, if unspecified the
             * encoder will default to using x265_2pass.log */
            const char* statFileName;
    
            /* temporally blur quants */
            double    qblur;
    
            /* temporally blur complexity */
            double    complexityBlur;
    
            /* Enable slow and a more detailed first pass encode in multi pass rate control */
            int       bEnableSlowFirstPass;
            
            /* rate-control overrides */
            int        zoneCount;//配置zones的个数  自动识别
            x265_zone* zones;//用途????zones存储   配置关系如: --zones 2,4,q=4/10,12,b=3.2  分别为<start frame>,<end frame>,<option> where <option> is either q=<integer> (force QP) or b=<float> (bitrate multiplier)
    
            /* specify a text file which contains MAX_MAX_QP + 1 floating point
             * values to be copied into x265_lambda_tab and a second set of
             * MAX_MAX_QP + 1 floating point values for x265_lambda2_tab. All values
             * are separated by comma, space or newline. Text after a hash (#) is
             * ignored. The lambda tables are process-global, so these new lambda
             * values will affect all encoders in the same process */
            const char* lambdaFileName;
    
            /* Enable stricter conditions to check bitrate deviations in CBR mode. May compromise 
             * quality to maintain bitrate adherence */
            int bStrictCbr;//使其更严格的按照目标码率进行编码 (这样可能带来的负面效果是:质量不佳) 默认:关闭  --[no-]strict-cbr
    
            /* Enable adaptive quantization at CU granularity. This parameter specifies 
             * the minimum CU size at which QP can be adjusted, i.e. Quantization Group 
             * (QG) size. Allowed values are 64, 32, 16 provided it falls within the 
             * inclusuve range [maxCUSize, minCUSize]. Experimental, default: maxCUSize*/
            uint32_t qgSize;
        } rc;
    
        /*== Video Usability Information ==*/
        struct
        {
            /* Aspect ratio idc to be added to the VUI.  The default is 0 indicating
             * the apsect ratio is unspecified. If set to X265_EXTENDED_SAR then
             * sarWidth and sarHeight must also be set */
            int aspectRatioIdc;
    
            /* Sample Aspect Ratio width in arbitrary units to be added to the VUI
             * only if aspectRatioIdc is set to X265_EXTENDED_SAR.  This is the width
             * of an individual pixel. If this is set then sarHeight must also be set */
            int sarWidth;
    
            /* Sample Aspect Ratio height in arbitrary units to be added to the VUI.
             * only if aspectRatioIdc is set to X265_EXTENDED_SAR.  This is the width
             * of an individual pixel. If this is set then sarWidth must also be set */
            int sarHeight;
    
            /* Enable overscan info present flag in the VUI.  If this is set then
             * bEnabledOverscanAppropriateFlag will be added to the VUI. The default
             * is false */
            int bEnableOverscanInfoPresentFlag;
    
            /* Enable overscan appropriate flag.  The status of this flag is added
             * to the VUI only if bEnableOverscanInfoPresentFlag is set. If this
             * flag is set then cropped decoded pictures may be output for display.
             * The default is false */
            int bEnableOverscanAppropriateFlag;
    
            /* Video signal type present flag of the VUI.  If this is set then
             * videoFormat, bEnableVideoFullRangeFlag and
             * bEnableColorDescriptionPresentFlag will be added to the VUI. The
             * default is false */
            int bEnableVideoSignalTypePresentFlag;
    
            /* Video format of the source video.  0 = component, 1 = PAL, 2 = NTSC,
             * 3 = SECAM, 4 = MAC, 5 = unspecified video format is the default */
            int videoFormat;
    
            /* Video full range flag indicates the black level and range of the luma
             * and chroma signals as derived from E′Y, E′PB, and E′PR or E′R, E′G,
             * and E′B real-valued component signals. The default is false */
            int bEnableVideoFullRangeFlag;
    
            /* Color description present flag in the VUI. If this is set then
             * color_primaries, transfer_characteristics and matrix_coeffs are to be
             * added to the VUI. The default is false */
            int bEnableColorDescriptionPresentFlag;
    
            /* Color primaries holds the chromacity coordinates of the source
             * primaries. The default is 2 */
            int colorPrimaries;
    
            /* Transfer characteristics indicates the opto-electronic transfer
             * characteristic of the source picture. The default is 2 */
            int transferCharacteristics;
    
            /* Matrix coefficients used to derive the luma and chroma signals from
             * the red, blue and green primaries. The default is 2 */
            int matrixCoeffs;
    
            /* Chroma location info present flag adds chroma_sample_loc_type_top_field and
             * chroma_sample_loc_type_bottom_field to the VUI. The default is false */
            int bEnableChromaLocInfoPresentFlag;
    
            /* Chroma sample location type top field holds the chroma location in
             * the top field. The default is 0 */
            int chromaSampleLocTypeTopField;
    
            /* Chroma sample location type bottom field holds the chroma location in
             * the bottom field. The default is 0 */
            int chromaSampleLocTypeBottomField;
    
            /* Default display window flag adds def_disp_win_left_offset,
             * def_disp_win_right_offset, def_disp_win_top_offset and
             * def_disp_win_bottom_offset to the VUI. The default is false */
            int bEnableDefaultDisplayWindowFlag;
    
            /* Default display window left offset holds the left offset with the
             * conformance cropping window to further crop the displayed window */
            int defDispWinLeftOffset;
    
            /* Default display window right offset holds the right offset with the
             * conformance cropping window to further crop the displayed window */
            int defDispWinRightOffset;
    
            /* Default display window top offset holds the top offset with the
             * conformance cropping window to further crop the displayed window */
            int defDispWinTopOffset;
    
            /* Default display window bottom offset holds the bottom offset with the
             * conformance cropping window to further crop the displayed window */
            int defDispWinBottomOffset;
        } vui;
    
        /* SMPTE ST 2086 mastering display color volume SEI info, specified as a
         * string which is parsed when the stream header SEI are emitted. The string
         * format is "G(%hu,%hu)B(%hu,%hu)R(%hu,%hu)WP(%hu,%hu)L(%u,%u)" where %hu
         * are unsigned 16bit integers and %u are unsigned 32bit integers. The SEI
         * includes X,Y display primaries for RGB channels, white point X,Y and
         * max,min luminance values. */
        const char* masteringDisplayColorVolume;
    
        /* Content light level info SEI, specified as a string which is parsed when
         * the stream header SEI are emitted. The string format is "%hu,%hu" where
         * %hu are unsigned 16bit integers. The first value is the max content light
         * level (or 0 if no maximum is indicated), the second value is the maximum
         * picture average light level (or 0). */
        const char* contentLightLevelInfo;
    
    } x265_param;
    
    /* x265_param_alloc:
     *  Allocates an x265_param instance. The returned param structure is not
     *  special in any way, but using this method together with x265_param_free()
     *  and x265_param_parse() to set values by name allows the application to treat
     *  x265_param as an opaque data struct for version safety */
    x265_param *x265_param_alloc(void);
    
    /* x265_param_free:
     *  Use x265_param_free() to release storage for an x265_param instance
     *  allocated by x265_param_alloc() */
    void x265_param_free(x265_param *);//释放param信息,ffmpeg会调用此接口libx265_encode_close
    
    /* x265_param_default:
     *  Initialize an x265_param structure to default values */
    void x265_param_default(x265_param *param);
    
    /* x265_param_parse:
     *  set one parameter by name.
     *  returns 0 on success, or returns one of the following errors.
     *  note: BAD_VALUE occurs only if it can't even parse the value,
     *  numerical range is not checked until x265_encoder_open().
     *  value=NULL means "true" for boolean options, but is a BAD_VALUE for non-booleans. */
    #define X265_PARAM_BAD_NAME  (-1)
    #define X265_PARAM_BAD_VALUE (-2)
    int x265_param_parse(x265_param *p, const char *name, const char *value);
    
    static const char * const x265_profile_names[] = {
        /* HEVC v1 */
        "main", "main10", "mainstillpicture", /* alias */ "msp",
    
        /* HEVC v2 (Range Extensions) */
        "main-intra", "main10-intra",
        "main444-8",  "main444-intra", "main444-stillpicture",
    
        "main422-10", "main422-10-intra",
        "main444-10", "main444-10-intra",
    
        "main12",     "main12-intra",                  /* Highly Experimental */
        "main422-12", "main422-12-intra",
        "main444-12", "main444-12-intra",
    
        "main444-16-intra", "main444-16-stillpicture", /* Not Supported! */
        0
    };
    
    /* x265_param_apply_profile:
     *      Applies the restrictions of the given profile. (one of x265_profile_names)
     *      (can be NULL, in which case the function will do nothing)
     *      Note: the detected profile can be lower than the one specified to this
     *      function. This function will force the encoder parameters to fit within
     *      the specified profile, or fail if that is impossible.
     *      returns 0 on success, negative on failure (e.g. invalid profile name). */
    int x265_param_apply_profile(x265_param *, const char *profile);
    
    /* x265_param_default_preset:
     *      The same as x265_param_default, but also use the passed preset and tune
     *      to modify the default settings.
     *      (either can be NULL, which implies no preset or no tune, respectively)
     *
     *      Currently available presets are, ordered from fastest to slowest: */
    static const char * const x265_preset_names[] = { "ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow", "placebo", 0 };
    
    /*      The presets can also be indexed numerically, as in:
     *      x265_param_default_preset( ¶m, "3", ... )
     *      with ultrafast mapping to "0" and placebo mapping to "9".  This mapping may
     *      of course change if new presets are added in between, but will always be
     *      ordered from fastest to slowest.
     *
     *      Warning: the speed of these presets scales dramatically.  Ultrafast is a full
     *      100 times faster than placebo!
     *
     *      Currently available tunings are: */
    static const char * const x265_tune_names[] = { "psnr", "ssim", "grain", "zerolatency", "fastdecode", 0 };
    
    /*      returns 0 on success, negative on failure (e.g. invalid preset/tune name). */
    int x265_param_default_preset(x265_param *, const char *preset, const char *tune);
    
    /* x265_picture_alloc:
     *  Allocates an x265_picture instance. The returned picture structure is not
     *  special in any way, but using this method together with x265_picture_free()
     *  and x265_picture_init() allows some version safety. New picture fields will
     *  always be added to the end of x265_picture */
    x265_picture *x265_picture_alloc(void);
    
    /* x265_picture_free:
     *  Use x265_picture_free() to release storage for an x265_picture instance
     *  allocated by x265_picture_alloc() */
    void x265_picture_free(x265_picture *);
    
    /* x265_picture_init:
     *       Initialize an x265_picture structure to default values. It sets the pixel
     *       depth and color space to the encoder's internal values and sets the slice
     *       type to auto - so the lookahead will determine slice type. */
    void x265_picture_init(x265_param *param, x265_picture *pic);
    
    /* x265_max_bit_depth:
     *      Specifies the numer of bits per pixel that x265 uses internally to
     *      represent a pixel, and the bit depth of the output bitstream.
     *      param->internalBitDepth must be set to this value. x265_max_bit_depth
     *      will be 8 for default builds, 10 for HIGH_BIT_DEPTH builds. */
    X265_API extern const int x265_max_bit_depth;
    
    /* x265_version_str:
     *      A static string containing the version of this compiled x265 library */
    X265_API extern const char *x265_version_str;
    
    /* x265_build_info:
     *      A static string describing the compiler and target architecture */
    X265_API extern const char *x265_build_info_str;
    
    /* Force a link error in the case of linking against an incompatible API version.
     * Glue #defines exist to force correct macro expansion; the final output of the macro
     * is x265_encoder_open_##X265_BUILD (for purposes of dlopen). */
    #define x265_encoder_glue1(x, y) x ## y
    #define x265_encoder_glue2(x, y) x265_encoder_glue1(x, y)
    #define x265_encoder_open x265_encoder_glue2(x265_encoder_open_, X265_BUILD)
    
    /* x265_encoder_open:
     *      create a new encoder handler, all parameters from x265_param are copied */
    x265_encoder* x265_encoder_open(x265_param *);
    
    /* x265_encoder_parameters:
     *      copies the current internal set of parameters to the pointer provided
     *      by the caller.  useful when the calling application needs to know
     *      how x265_encoder_open has changed the parameters.
     *      note that the data accessible through pointers in the returned param struct
     *      (e.g. filenames) should not be modified by the calling application. */
    void x265_encoder_parameters(x265_encoder *, x265_param *);
    
    /* x265_encoder_headers:
     *      return the SPS and PPS that will be used for the whole stream.
     *      *pi_nal is the number of NAL units outputted in pp_nal.
     *      returns negative on error, total byte size of payload data on success
     *      the payloads of all output NALs are guaranteed to be sequential in memory. */
    int x265_encoder_headers(x265_encoder *, x265_nal **pp_nal, uint32_t *pi_nal);
    
    /* x265_encoder_encode:
     *      encode one picture.
     *      *pi_nal is the number of NAL units outputted in pp_nal.
     *      returns negative on error, 1 if a picture and access unit were output,
     *      or zero if the encoder pipeline is still filling or is empty after flushing.
     *      the payloads of all output NALs are guaranteed to be sequential in memory.
     *      To flush the encoder and retrieve delayed output pictures, pass pic_in as NULL.
     *      Once flushing has begun, all subsequent calls must pass pic_in as NULL. */
    int x265_encoder_encode(x265_encoder *encoder, x265_nal **pp_nal, uint32_t *pi_nal, x265_picture *pic_in, x265_picture *pic_out);
    
    /* x265_encoder_reconfig:
     *      various parameters from x265_param are copied.
     *      this takes effect immediately, on whichever frame is encoded next;
     *      returns 0 on success, negative on parameter validation error.
     *
     *      not all parameters can be changed; see the actual function for a
     *      detailed breakdown.  since not all parameters can be changed, moving
     *      from preset to preset may not always fully copy all relevant parameters,
     *      but should still work usably in practice. however, more so than for
     *      other presets, many of the speed shortcuts used in ultrafast cannot be
     *      switched out of; using reconfig to switch between ultrafast and other
     *      presets is not recommended without a more fine-grained breakdown of
     *      parameters to take this into account. */
    int x265_encoder_reconfig(x265_encoder *, x265_param *);
    
    /* x265_encoder_get_stats:
     *       returns encoder statistics */
    void x265_encoder_get_stats(x265_encoder *encoder, x265_stats *, uint32_t statsSizeBytes);
    
    /* x265_encoder_log:
     *       This function is deprecated */
    void x265_encoder_log(x265_encoder *encoder, int argc, char **argv);
    
    /* x265_encoder_close:
     *      close an encoder handler */
    void x265_encoder_close(x265_encoder *);//释放编码器 会在ffmpeg中调用
    
    /* x265_cleanup:
     *       release library static allocations, reset configured CTU size */
    void x265_cleanup(void);
    
    #define X265_MAJOR_VERSION 1
    
    /* === Multi-lib API ===
     * By using this method to gain access to the libx265 interfaces, you allow run-
     * time selection between various available libx265 libraries based on the
     * encoder parameters. The most likely use case is to choose between Main and
     * Main10 builds of libx265. */
    
    typedef struct x265_api
    {
        int           api_major_version;    /* X265_MAJOR_VERSION */
        int           api_build_number;     /* X265_BUILD (soname) */
        int           sizeof_param;         /* sizeof(x265_param) */
        int           sizeof_picture;       /* sizeof(x265_picture) */
        int           sizeof_analysis_data; /* sizeof(x265_analysis_data) */
        int           sizeof_zone;          /* sizeof(x265_zone) */
        int           sizeof_stats;         /* sizeof(x265_stats) */
    
        int           bit_depth;
        const char*   version_str;
        const char*   build_info_str;
    
        /* libx265 public API functions, documented above with x265_ prefixes */
        x265_param*   (*param_alloc)(void);
        void          (*param_free)(x265_param*);
        void          (*param_default)(x265_param*);
        int           (*param_parse)(x265_param*, const char*, const char*);
        int           (*param_apply_profile)(x265_param*, const char*);
        int           (*param_default_preset)(x265_param*, const char*, const char *);
        x265_picture* (*picture_alloc)(void);
        void          (*picture_free)(x265_picture*);
        void          (*picture_init)(x265_param*, x265_picture*);
        x265_encoder* (*encoder_open)(x265_param*);
        void          (*encoder_parameters)(x265_encoder*, x265_param*);
        int           (*encoder_reconfig)(x265_encoder*, x265_param*);
        int           (*encoder_headers)(x265_encoder*, x265_nal**, uint32_t*);
        int           (*encoder_encode)(x265_encoder*, x265_nal**, uint32_t*, x265_picture*, x265_picture*);
        void          (*encoder_get_stats)(x265_encoder*, x265_stats*, uint32_t);
        void          (*encoder_log)(x265_encoder*, int, char**);
        void          (*encoder_close)(x265_encoder*);
        void          (*cleanup)(void);
    
        int           sizeof_frame_stats;   /* sizeof(x265_frame_stats) */
        /* add new pointers to the end, or increment X265_MAJOR_VERSION */
    } x265_api;
    
    /* Force a link error in the case of linking against an incompatible API version.
     * Glue #defines exist to force correct macro expansion; the final output of the macro
     * is x265_api_get_##X265_BUILD (for purposes of dlopen). */
    #define x265_api_glue1(x, y) x ## y
    #define x265_api_glue2(x, y) x265_api_glue1(x, y)
    #define x265_api_get x265_api_glue2(x265_api_get_, X265_BUILD)
    
    /* x265_api_get:
     *   Retrieve the programming interface for a linked x265 library.
     *   May return NULL if no library is available that supports the
     *   requested bit depth. If bitDepth is 0 the function is guarunteed
     *   to return a non-NULL x265_api pointer, from the linked libx265.
     *
     *   If the requested bitDepth is not supported by the linked libx265,
     *   it will attempt to dynamically bind x265_api_get() from a shared
     *   library with an appropriate name:
     *     8bit:  libx265_main.so
     *     10bit: libx265_main10.so
     *   Obviously the shared library file extension is platform specific */
    const x265_api* x265_api_get(int bitDepth);
    
    /* x265_api_query:
     *   Retrieve the programming interface for a linked x265 library, like
     *   x265_api_get(), except this function accepts X265_BUILD as the second
     *   argument rather than using the build number as part of the function name.
     *   Applications which dynamically link to libx265 can use this interface to
     *   query the library API and achieve a relative amount of version skew
     *   flexibility. The function may return NULL if the library determines that
     *   the apiVersion that your application was compiled against is not compatible
     *   with the library you have linked with.
     *
     *   api_major_version will be incremented any time non-backward compatible
     *   changes are made to any public structures or functions. If
     *   api_major_version does not match X265_MAJOR_VERSION from the x265.h your
     *   application compiled against, your application must not use the returned
     *   x265_api pointer.
     *
     *   Users of this API *must* also validate the sizes of any structures which
     *   are not treated as opaque in application code. For instance, if your
     *   application dereferences a x265_param pointer, then it must check that
     *   api->sizeof_param matches the sizeof(x265_param) that your application
     *   compiled with. */
    const x265_api* x265_api_query(int bitDepth, int apiVersion, int* err);
    
    #define X265_API_QUERY_ERR_NONE           0 /* returned API pointer is non-NULL */
    #define X265_API_QUERY_ERR_VER_REFUSED    1 /* incompatible version skew        */
    #define X265_API_QUERY_ERR_LIB_NOT_FOUND  2 /* libx265_main10 not found, for ex */
    #define X265_API_QUERY_ERR_FUNC_NOT_FOUND 3 /* unable to bind x265_api_query    */
    #define X265_API_QUERY_ERR_WRONG_BITDEPTH 4 /* libx265_main10 not 10bit, for ex */
    
    static const char * const x265_api_query_errnames[] = {
        "api queried from libx265",
        "libx265 version is not compatible with this application",
        "unable to bind a libx265 with requested bit depth",
        "unable to bind x265_api_query from libx265",
        "libx265 has an invalid bitdepth"
    };
    
    #ifdef __cplusplus
    }
    #endif
    
    #endif // X265_H
    


     

    展开全文
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