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/*
* H.264 encoding using the x264 library
* Copyright (C) 2005 Mans Rullgard <mans@mansr.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "internal.h"
#include <x264.h>
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct X264Context {
    AVClass *class;
    x264_param_t params;
    x264_t *enc;
    x264_picture_t pic;
    uint8_t *sei;
    int sei_size;
    AVFrame out_pic;
    char *preset;
    char *tune;
    char *profile;
    char *level;
    int fastfirstpass;
    char *wpredp;
    char *x264opts;
    float crf;
    float crf_max;
    int cqp;
    int aq_mode;
    float aq_strength;
    char *psy_rd;
    int psy;
    int rc_lookahead;
    int weightp;
    int weightb;
    int ssim;
    int intra_refresh;
    int b_bias;
    int b_pyramid;
    int mixed_refs;
    int dct8x8;
    int fast_pskip;
    int aud;
    int mbtree;
    char *deblock;
    float cplxblur;
    char *partitions;
    int direct_pred;
    int slice_max_size;
    char *stats;
    int nal_hrd;
} X264Context;

static void X264_log(void *p, int level, const char *fmt, va_list args)
{
    static const int level_map[] = {
        [X264_LOG_ERROR] = AV_LOG_ERROR,
        [X264_LOG_WARNING] = AV_LOG_WARNING,
        [X264_LOG_INFO] = AV_LOG_INFO,
        [X264_LOG_DEBUG] = AV_LOG_DEBUG
    };

    if (level < 0 || level > X264_LOG_DEBUG)
        return;

    av_vlog(p, level_map[level], fmt, args);
}


static int encode_nals(AVCodecContext *ctx, AVPacket *pkt,
                       x264_nal_t *nals, int nnal)
{
    X264Context *x4 = ctx->priv_data;
    uint8_t *p;
    int i, size = x4->sei_size, ret;

    if (!nnal)
        return 0;

    for (i = 0; i < nnal; i++)
        size += nals[i].i_payload;

    if ((ret = ff_alloc_packet2(ctx, pkt, size)) < 0)
        return ret;

    p = pkt->data;

    /* Write the SEI as part of the first frame. */
    if (x4->sei_size > 0 && nnal > 0) {
        if (x4->sei_size > size) {
            av_log(ctx, AV_LOG_ERROR, "Error: nal buffer is too small\n");
            return -1;
        }
        memcpy(p, x4->sei, x4->sei_size);
        p += x4->sei_size;
        x4->sei_size = 0;
        av_freep(&x4->sei);
    }

    for (i = 0; i < nnal; i++){
        memcpy(p, nals[i].p_payload, nals[i].i_payload);
        p += nals[i].i_payload;
    }

    return 1;
}

static int avfmt2_num_planes(int avfmt)
{
    switch (avfmt) {
    case PIX_FMT_YUV420P:
    case PIX_FMT_YUVJ420P:
    case PIX_FMT_YUV420P9:
    case PIX_FMT_YUV420P10:
    case PIX_FMT_YUV444P:
        return 3;

    case PIX_FMT_BGR24:
    case PIX_FMT_RGB24:
        return 1;

    default:
        return 3;
    }
}

static int X264_frame(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame,
                      int *got_packet)
{
    X264Context *x4 = ctx->priv_data;
    x264_nal_t *nal;
    int nnal, i, ret;
    x264_picture_t pic_out;

    x264_picture_init( &x4->pic );
    x4->pic.img.i_csp = x4->params.i_csp;
    if (x264_bit_depth > 8)
        x4->pic.img.i_csp |= X264_CSP_HIGH_DEPTH;
    x4->pic.img.i_plane = avfmt2_num_planes(ctx->pix_fmt);

    if (frame) {
        for (i = 0; i < x4->pic.img.i_plane; i++) {
            x4->pic.img.plane[i] = frame->data[i];
            x4->pic.img.i_stride[i] = frame->linesize[i];
        }

        x4->pic.i_pts = frame->pts;
        x4->pic.i_type =
            frame->pict_type == AV_PICTURE_TYPE_I ? X264_TYPE_KEYFRAME :
            frame->pict_type == AV_PICTURE_TYPE_P ? X264_TYPE_P :
            frame->pict_type == AV_PICTURE_TYPE_B ? X264_TYPE_B :
                                            X264_TYPE_AUTO;
        if (x4->params.b_tff != frame->top_field_first) {
            x4->params.b_tff = frame->top_field_first;
            x264_encoder_reconfig(x4->enc, &x4->params);
        }
        if (x4->params.vui.i_sar_height != ctx->sample_aspect_ratio.den ||
            x4->params.vui.i_sar_width != ctx->sample_aspect_ratio.num) {
            x4->params.vui.i_sar_height = ctx->sample_aspect_ratio.den;
            x4->params.vui.i_sar_width = ctx->sample_aspect_ratio.num;
            x264_encoder_reconfig(x4->enc, &x4->params);
        }
    }

    do {
        if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0)
            return -1;

        ret = encode_nals(ctx, pkt, nal, nnal);
        if (ret < 0)
            return -1;
    } while (!ret && !frame && x264_encoder_delayed_frames(x4->enc));

    pkt->pts = pic_out.i_pts;
    pkt->dts = pic_out.i_dts;

    switch (pic_out.i_type) {
    case X264_TYPE_IDR:
    case X264_TYPE_I:
        x4->out_pic.pict_type = AV_PICTURE_TYPE_I;
        break;
    case X264_TYPE_P:
        x4->out_pic.pict_type = AV_PICTURE_TYPE_P;
        break;
    case X264_TYPE_B:
    case X264_TYPE_BREF:
        x4->out_pic.pict_type = AV_PICTURE_TYPE_B;
        break;
    }

    pkt->flags |= AV_PKT_FLAG_KEY*pic_out.b_keyframe;
    if (ret)
        x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;

    *got_packet = ret;
    return 0;
}

static av_cold int X264_close(AVCodecContext *avctx)
{
    X264Context *x4 = avctx->priv_data;

    av_freep(&avctx->extradata);
    av_free(x4->sei);

    if (x4->enc)
        x264_encoder_close(x4->enc);

    return 0;
}

#define OPT_STR(opt, param) \
do { \
int ret; \
if (param && (ret = x264_param_parse(&x4->params, opt, param)) < 0) { \
if(ret == X264_PARAM_BAD_NAME) \
av_log(avctx, AV_LOG_ERROR, \
"bad option '%s': '%s'\n", opt, param); \
else \
av_log(avctx, AV_LOG_ERROR, \
"bad value for '%s': '%s'\n", opt, param); \
return -1; \
} \
} while (0)

static int convert_pix_fmt(enum PixelFormat pix_fmt)
{
    switch (pix_fmt) {
    case PIX_FMT_YUV420P:
    case PIX_FMT_YUVJ420P:
    case PIX_FMT_YUV420P9:
    case PIX_FMT_YUV420P10: return X264_CSP_I420;
    case PIX_FMT_YUV422P:
    case PIX_FMT_YUV422P10: return X264_CSP_I422;
    case PIX_FMT_YUV444P:
    case PIX_FMT_YUV444P9:
    case PIX_FMT_YUV444P10: return X264_CSP_I444;
#ifdef X264_CSP_BGR
    case PIX_FMT_BGR24:
        return X264_CSP_BGR;

    case PIX_FMT_RGB24:
        return X264_CSP_RGB;
#endif
    };
    return 0;
}

#define PARSE_X264_OPT(name, var)\
if (x4->var && x264_param_parse(&x4->params, name, x4->var) < 0) {\
av_log(avctx, AV_LOG_ERROR, "Error parsing option '%s' with value '%s'.\n", name, x4->var);\
return AVERROR(EINVAL);\
}

static av_cold int X264_init(AVCodecContext *avctx)
{
    X264Context *x4 = avctx->priv_data;
    int sw,sh;

    x264_param_default(&x4->params);

    x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER;

    x4->params.rc.f_ip_factor = 1 / fabs(avctx->i_quant_factor);
    x4->params.rc.f_pb_factor = avctx->b_quant_factor;
    x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
    if (x4->preset || x4->tune)
        if (x264_param_default_preset(&x4->params, x4->preset, x4->tune) < 0) {
            int i;
            av_log(avctx, AV_LOG_ERROR, "Error setting preset/tune %s/%s.\n", x4->preset, x4->tune);
            av_log(avctx, AV_LOG_INFO, "Possible presets:");
            for (i = 0; x264_preset_names[i]; i++)
                av_log(avctx, AV_LOG_INFO, " %s", x264_preset_names[i]);
            av_log(avctx, AV_LOG_INFO, "\n");
            av_log(avctx, AV_LOG_INFO, "Possible tunes:");
            for (i = 0; x264_tune_names[i]; i++)
                av_log(avctx, AV_LOG_INFO, " %s", x264_tune_names[i]);
            av_log(avctx, AV_LOG_INFO, "\n");
            return AVERROR(EINVAL);
        }

    if (avctx->level > 0)
        x4->params.i_level_idc = avctx->level;

    x4->params.pf_log = X264_log;
    x4->params.p_log_private = avctx;
    x4->params.i_log_level = X264_LOG_DEBUG;
    x4->params.i_csp = convert_pix_fmt(avctx->pix_fmt);

    OPT_STR("weightp", x4->wpredp);

    if (avctx->bit_rate) {
        x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
        x4->params.rc.i_rc_method = X264_RC_ABR;
    }
    x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
    x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000;
    x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1;
    if (avctx->flags & CODEC_FLAG_PASS2) {
        x4->params.rc.b_stat_read = 1;
    } else {
        if (x4->crf >= 0) {
            x4->params.rc.i_rc_method = X264_RC_CRF;
            x4->params.rc.f_rf_constant = x4->crf;
        } else if (x4->cqp >= 0) {
            x4->params.rc.i_rc_method = X264_RC_CQP;
            x4->params.rc.i_qp_constant = x4->cqp;
        }

        if (x4->crf_max >= 0)
            x4->params.rc.f_rf_constant_max = x4->crf_max;
    }

    if (avctx->rc_buffer_size && avctx->rc_initial_buffer_occupancy &&
        (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
        x4->params.rc.f_vbv_buffer_init =
            (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
    }

    OPT_STR("level", x4->level);

    if(x4->x264opts){
        const char *p= x4->x264opts;
        while(p){
            char param[256]={0}, val[256]={0};
            if(sscanf(p, "%255[^:=]=%255[^:]", param, val) == 1){
                OPT_STR(param, "1");
            }else
                OPT_STR(param, val);
            p= strchr(p, ':');
            p+=!!p;
        }
    }

    if (avctx->me_method == ME_EPZS)
        x4->params.analyse.i_me_method = X264_ME_DIA;
    else if (avctx->me_method == ME_HEX)
        x4->params.analyse.i_me_method = X264_ME_HEX;
    else if (avctx->me_method == ME_UMH)
        x4->params.analyse.i_me_method = X264_ME_UMH;
    else if (avctx->me_method == ME_FULL)
        x4->params.analyse.i_me_method = X264_ME_ESA;
    else if (avctx->me_method == ME_TESA)
        x4->params.analyse.i_me_method = X264_ME_TESA;

    if (avctx->gop_size >= 0)
        x4->params.i_keyint_max = avctx->gop_size;
    if (avctx->max_b_frames >= 0)
        x4->params.i_bframe = avctx->max_b_frames;
    if (avctx->scenechange_threshold >= 0)
        x4->params.i_scenecut_threshold = avctx->scenechange_threshold;
    if (avctx->qmin >= 0)
        x4->params.rc.i_qp_min = avctx->qmin;
    if (avctx->qmax >= 0)
        x4->params.rc.i_qp_max = avctx->qmax;
    if (avctx->max_qdiff >= 0)
        x4->params.rc.i_qp_step = avctx->max_qdiff;
    if (avctx->qblur >= 0)
        x4->params.rc.f_qblur = avctx->qblur; /* temporally blur quants */
    if (avctx->qcompress >= 0)
        x4->params.rc.f_qcompress = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
    if (avctx->refs >= 0)
        x4->params.i_frame_reference = avctx->refs;
    if (avctx->trellis >= 0)
        x4->params.analyse.i_trellis = avctx->trellis;
    if (avctx->me_range >= 0)
        x4->params.analyse.i_me_range = avctx->me_range;
    if (avctx->noise_reduction >= 0)
        x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
    if (avctx->me_subpel_quality >= 0)
        x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
    if (avctx->b_frame_strategy >= 0)
        x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
    if (avctx->keyint_min >= 0)
        x4->params.i_keyint_min = avctx->keyint_min;
    if (avctx->coder_type >= 0)
        x4->params.b_cabac = avctx->coder_type == FF_CODER_TYPE_AC;
    if (avctx->me_cmp >= 0)
        x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA;

    if (x4->aq_mode >= 0)
        x4->params.rc.i_aq_mode = x4->aq_mode;
    if (x4->aq_strength >= 0)
        x4->params.rc.f_aq_strength = x4->aq_strength;
    PARSE_X264_OPT("psy-rd", psy_rd);
    PARSE_X264_OPT("deblock", deblock);
    PARSE_X264_OPT("partitions", partitions);
    PARSE_X264_OPT("stats", stats);
    if (x4->psy >= 0)
        x4->params.analyse.b_psy = x4->psy;
    if (x4->rc_lookahead >= 0)
        x4->params.rc.i_lookahead = x4->rc_lookahead;
    if (x4->weightp >= 0)
        x4->params.analyse.i_weighted_pred = x4->weightp;
    if (x4->weightb >= 0)
        x4->params.analyse.b_weighted_bipred = x4->weightb;
    if (x4->cplxblur >= 0)
        x4->params.rc.f_complexity_blur = x4->cplxblur;

    if (x4->ssim >= 0)
        x4->params.analyse.b_ssim = x4->ssim;
    if (x4->intra_refresh >= 0)
        x4->params.b_intra_refresh = x4->intra_refresh;
    if (x4->b_bias != INT_MIN)
        x4->params.i_bframe_bias = x4->b_bias;
    if (x4->b_pyramid >= 0)
        x4->params.i_bframe_pyramid = x4->b_pyramid;
    if (x4->mixed_refs >= 0)
        x4->params.analyse.b_mixed_references = x4->mixed_refs;
    if (x4->dct8x8 >= 0)
        x4->params.analyse.b_transform_8x8 = x4->dct8x8;
    if (x4->fast_pskip >= 0)
        x4->params.analyse.b_fast_pskip = x4->fast_pskip;
    if (x4->aud >= 0)
        x4->params.b_aud = x4->aud;
    if (x4->mbtree >= 0)
        x4->params.rc.b_mb_tree = x4->mbtree;
    if (x4->direct_pred >= 0)
        x4->params.analyse.i_direct_mv_pred = x4->direct_pred;

    if (x4->slice_max_size >= 0)
        x4->params.i_slice_max_size = x4->slice_max_size;
    else {
        /*
* Allow x264 to be instructed through AVCodecContext about the maximum
* size of the RTP payload. For example, this enables the production of
* payload suitable for the H.264 RTP packetization-mode 0 i.e. single
* NAL unit per RTP packet.
*/
        if (avctx->rtp_payload_size)
            x4->params.i_slice_max_size = avctx->rtp_payload_size;
    }

    if (x4->fastfirstpass)
        x264_param_apply_fastfirstpass(&x4->params);

    /* Allow specifying the x264 profile through AVCodecContext. */
    if (!x4->profile)
        switch (avctx->profile) {
        case FF_PROFILE_H264_BASELINE:
            x4->profile = av_strdup("baseline");
            break;
        case FF_PROFILE_H264_HIGH:
            x4->profile = av_strdup("high");
            break;
        case FF_PROFILE_H264_HIGH_10:
            x4->profile = av_strdup("high10");
            break;
        case FF_PROFILE_H264_HIGH_422:
            x4->profile = av_strdup("high422");
            break;
        case FF_PROFILE_H264_HIGH_444:
            x4->profile = av_strdup("high444");
            break;
        case FF_PROFILE_H264_MAIN:
            x4->profile = av_strdup("main");
            break;
        default:
            break;
        }

    if (x4->nal_hrd >= 0)
        x4->params.i_nal_hrd = x4->nal_hrd;

    if (x4->profile)
        if (x264_param_apply_profile(&x4->params, x4->profile) < 0) {
            int i;
            av_log(avctx, AV_LOG_ERROR, "Error setting profile %s.\n", x4->profile);
            av_log(avctx, AV_LOG_INFO, "Possible profiles:");
            for (i = 0; x264_profile_names[i]; i++)
                av_log(avctx, AV_LOG_INFO, " %s", x264_profile_names[i]);
            av_log(avctx, AV_LOG_INFO, "\n");
            return AVERROR(EINVAL);
        }

    x4->params.i_width = avctx->width;
    x4->params.i_height = avctx->height;
    av_reduce(&sw, &sh, avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, 4096);
    x4->params.vui.i_sar_width = sw;
    x4->params.vui.i_sar_height = sh;
    x4->params.i_fps_num = x4->params.i_timebase_den = avctx->time_base.den;
    x4->params.i_fps_den = x4->params.i_timebase_num = avctx->time_base.num;

    x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;

    x4->params.i_threads = avctx->thread_count;
    if (avctx->thread_type)
        x4->params.b_sliced_threads = avctx->thread_type == FF_THREAD_SLICE;

    x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT;

    x4->params.b_open_gop = !(avctx->flags & CODEC_FLAG_CLOSED_GOP);

    x4->params.i_slice_count = avctx->slices;

    x4->params.vui.b_fullrange = avctx->pix_fmt == PIX_FMT_YUVJ420P;

    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
        x4->params.b_repeat_headers = 0;

    // update AVCodecContext with x264 parameters
    avctx->has_b_frames = x4->params.i_bframe ?
        x4->params.i_bframe_pyramid ? 2 : 1 : 0;
    if (avctx->max_b_frames < 0)
        avctx->max_b_frames = 0;

    avctx->bit_rate = x4->params.rc.i_bitrate*1000;

    x4->enc = x264_encoder_open(&x4->params);
    if (!x4->enc)
        return -1;

    avctx->coded_frame = &x4->out_pic;

    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
        x264_nal_t *nal;
        uint8_t *p;
        int nnal, s, i;

        s = x264_encoder_headers(x4->enc, &nal, &nnal);
        avctx->extradata = p = av_malloc(s);

        for (i = 0; i < nnal; i++) {
            /* Don't put the SEI in extradata. */
            if (nal[i].i_type == NAL_SEI) {
                av_log(avctx, AV_LOG_INFO, "%s\n", nal[i].p_payload+25);
                x4->sei_size = nal[i].i_payload;
                x4->sei = av_malloc(x4->sei_size);
                memcpy(x4->sei, nal[i].p_payload, nal[i].i_payload);
                continue;
            }
            memcpy(p, nal[i].p_payload, nal[i].i_payload);
            p += nal[i].i_payload;
        }
        avctx->extradata_size = p - avctx->extradata;
    }

    return 0;
}

static const enum PixelFormat pix_fmts_8bit[] = {
    PIX_FMT_YUV420P,
    PIX_FMT_YUVJ420P,
    PIX_FMT_YUV422P,
    PIX_FMT_YUV444P,
    PIX_FMT_NONE
};
static const enum PixelFormat pix_fmts_9bit[] = {
    PIX_FMT_YUV420P9,
    PIX_FMT_YUV444P9,
    PIX_FMT_NONE
};
static const enum PixelFormat pix_fmts_10bit[] = {
    PIX_FMT_YUV420P10,
    PIX_FMT_YUV422P10,
    PIX_FMT_YUV444P10,
    PIX_FMT_NONE
};
static const enum PixelFormat pix_fmts_8bit_rgb[] = {
#ifdef X264_CSP_BGR
    PIX_FMT_BGR24,
    PIX_FMT_RGB24,
#endif
    PIX_FMT_NONE
};

static av_cold void X264_init_static(AVCodec *codec)
{
    if (x264_bit_depth == 8)
        codec->pix_fmts = pix_fmts_8bit;
    else if (x264_bit_depth == 9)
        codec->pix_fmts = pix_fmts_9bit;
    else if (x264_bit_depth == 10)
        codec->pix_fmts = pix_fmts_10bit;
}

#define OFFSET(x) offsetof(X264Context, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
    { "preset", "Set the encoding preset (cf. x264 --fullhelp)", OFFSET(preset), AV_OPT_TYPE_STRING, { .str = "medium" }, 0, 0, VE},
    { "tune", "Tune the encoding params (cf. x264 --fullhelp)", OFFSET(tune), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE},
    { "profile", "Set profile restrictions (cf. x264 --fullhelp) ", OFFSET(profile), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE},
    { "fastfirstpass", "Use fast settings when encoding first pass", OFFSET(fastfirstpass), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE},
    {"level", "Specify level (as defined by Annex A)", OFFSET(level), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE},
    {"passlogfile", "Filename for 2 pass stats", OFFSET(stats), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE},
    {"wpredp", "Weighted prediction for P-frames", OFFSET(wpredp), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE},
    {"x264opts", "x264 options", OFFSET(x264opts), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE},
    { "crf", "Select the quality for constant quality mode", OFFSET(crf), AV_OPT_TYPE_FLOAT, {.dbl = -1 }, -1, FLT_MAX, VE },
    { "crf_max", "In CRF mode, prevents VBV from lowering quality beyond this point.",OFFSET(crf_max), AV_OPT_TYPE_FLOAT, {.dbl = -1 }, -1, FLT_MAX, VE },
    { "qp", "Constant quantization parameter rate control method",OFFSET(cqp), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE },
    { "aq-mode", "AQ method", OFFSET(aq_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE, "aq_mode"},
    { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = X264_AQ_NONE}, INT_MIN, INT_MAX, VE, "aq_mode" },
    { "variance", "Variance AQ (complexity mask)", 0, AV_OPT_TYPE_CONST, {.i64 = X264_AQ_VARIANCE}, INT_MIN, INT_MAX, VE, "aq_mode" },
    { "autovariance", "Auto-variance AQ (experimental)", 0, AV_OPT_TYPE_CONST, {.i64 = X264_AQ_AUTOVARIANCE}, INT_MIN, INT_MAX, VE, "aq_mode" },
    { "aq-strength", "AQ strength. Reduces blocking and blurring in flat and textured areas.", OFFSET(aq_strength), AV_OPT_TYPE_FLOAT, {.dbl = -1}, -1, FLT_MAX, VE},
    { "psy", "Use psychovisual optimizations.", OFFSET(psy), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE },
    { "psy-rd", "Strength of psychovisual optimization, in <psy-rd>:<psy-trellis> format.", OFFSET(psy_rd), AV_OPT_TYPE_STRING, {0 }, 0, 0, VE},
    { "rc-lookahead", "Number of frames to look ahead for frametype and ratecontrol", OFFSET(rc_lookahead), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE },
    { "weightb", "Weighted prediction for B-frames.", OFFSET(weightb), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE },
    { "weightp", "Weighted prediction analysis method.", OFFSET(weightp), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE, "weightp" },
    { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = X264_WEIGHTP_NONE}, INT_MIN, INT_MAX, VE, "weightp" },
    { "simple", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = X264_WEIGHTP_SIMPLE}, INT_MIN, INT_MAX, VE, "weightp" },
    { "smart", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = X264_WEIGHTP_SMART}, INT_MIN, INT_MAX, VE, "weightp" },
    { "ssim", "Calculate and print SSIM stats.", OFFSET(ssim), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE },
    { "intra-refresh", "Use Periodic Intra Refresh instead of IDR frames.",OFFSET(intra_refresh),AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE },
    { "b-bias", "Influences how often B-frames are used", OFFSET(b_bias), AV_OPT_TYPE_INT, { .i64 = INT_MIN}, INT_MIN, INT_MAX, VE },
    { "b-pyramid", "Keep some B-frames as references.", OFFSET(b_pyramid), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE, "b_pyramid" },
    { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = X264_B_PYRAMID_NONE}, INT_MIN, INT_MAX, VE, "b_pyramid" },
    { "strict", "Strictly hierarchical pyramid", 0, AV_OPT_TYPE_CONST, {.i64 = X264_B_PYRAMID_STRICT}, INT_MIN, INT_MAX, VE, "b_pyramid" },
    { "normal", "Non-strict (not Blu-ray compatible)", 0, AV_OPT_TYPE_CONST, {.i64 = X264_B_PYRAMID_NORMAL}, INT_MIN, INT_MAX, VE, "b_pyramid" },
    { "mixed-refs", "One reference per partition, as opposed to one reference per macroblock", OFFSET(mixed_refs), AV_OPT_TYPE_INT, { .i64 = -1}, -1, 1, VE },
    { "8x8dct", "High profile 8x8 transform.", OFFSET(dct8x8), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE},
    { "fast-pskip", NULL, OFFSET(fast_pskip), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE},
    { "aud", "Use access unit delimiters.", OFFSET(aud), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE},
    { "mbtree", "Use macroblock tree ratecontrol.", OFFSET(mbtree), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE},
    { "deblock", "Loop filter parameters, in <alpha:beta> form.", OFFSET(deblock), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE},
    { "cplxblur", "Reduce fluctuations in QP (before curve compression)", OFFSET(cplxblur), AV_OPT_TYPE_FLOAT, {.dbl = -1 }, -1, FLT_MAX, VE},
    { "partitions", "A comma-separated list of partitions to consider. "
                       "Possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all", OFFSET(partitions), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE},
    { "direct-pred", "Direct MV prediction mode", OFFSET(direct_pred), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE, "direct-pred" },
    { "none", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = X264_DIRECT_PRED_NONE }, 0, 0, VE, "direct-pred" },
    { "spatial", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = X264_DIRECT_PRED_SPATIAL }, 0, 0, VE, "direct-pred" },
    { "temporal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = X264_DIRECT_PRED_TEMPORAL }, 0, 0, VE, "direct-pred" },
    { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = X264_DIRECT_PRED_AUTO }, 0, 0, VE, "direct-pred" },
    { "slice-max-size","Limit the size of each slice in bytes", OFFSET(slice_max_size),AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE },
    { "stats", "Filename for 2 pass stats", OFFSET(stats), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
    { "nal-hrd", "Signal HRD information (requires vbv-bufsize; "
                       "cbr not allowed in .mp4)", OFFSET(nal_hrd), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, VE, "nal-hrd" },
    { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = X264_NAL_HRD_NONE}, INT_MIN, INT_MAX, VE, "nal-hrd" },
    { "vbr", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = X264_NAL_HRD_VBR}, INT_MIN, INT_MAX, VE, "nal-hrd" },
    { "cbr", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = X264_NAL_HRD_CBR}, INT_MIN, INT_MAX, VE, "nal-hrd" },
    { NULL },
};

static const AVClass class = {
    .class_name = "libx264",
    .item_name = av_default_item_name,
    .option = options,
    .version = LIBAVUTIL_VERSION_INT,
};

static const AVClass rgbclass = {
    .class_name = "libx264rgb",
    .item_name = av_default_item_name,
    .option = options,
    .version = LIBAVUTIL_VERSION_INT,
};

static const AVCodecDefault x264_defaults[] = {
    { "b", "0" },
    { "bf", "-1" },
    { "flags2", "0" },
    { "g", "-1" },
    { "qmin", "-1" },
    { "qmax", "-1" },
    { "qdiff", "-1" },
    { "qblur", "-1" },
    { "qcomp", "-1" },
// { "rc_lookahead", "-1" },
    { "refs", "-1" },
    { "sc_threshold", "-1" },
    { "trellis", "-1" },
    { "nr", "-1" },
    { "me_range", "-1" },
    { "me_method", "-1" },
    { "subq", "-1" },
    { "b_strategy", "-1" },
    { "keyint_min", "-1" },
    { "coder", "-1" },
    { "cmp", "-1" },
    { "threads", AV_STRINGIFY(X264_THREADS_AUTO) },
    { "thread_type", "0" },
    { "flags", "+cgop" },
    { NULL },
};

AVCodec ff_libx264_encoder = {
    .name = "libx264",
    .type = AVMEDIA_TYPE_VIDEO,
    .id = AV_CODEC_ID_H264,
    .priv_data_size = sizeof(X264Context),
    .init = X264_init,
    .encode2 = X264_frame,
    .close = X264_close,
    .capabilities = CODEC_CAP_DELAY | CODEC_CAP_AUTO_THREADS,
    .long_name = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
    .priv_class = &class,
    .defaults = x264_defaults,
    .init_static_data = X264_init_static,
};

AVCodec ff_libx264rgb_encoder = {
    .name = "libx264rgb",
    .type = AVMEDIA_TYPE_VIDEO,
    .id = AV_CODEC_ID_H264,
    .priv_data_size = sizeof(X264Context),
    .init = X264_init,
    .encode2 = X264_frame,
    .close = X264_close,
    .capabilities = CODEC_CAP_DELAY,
    .long_name = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGB"),
    .priv_class = &rgbclass,
    .defaults = x264_defaults,
    .pix_fmts = pix_fmts_8bit_rgb,
};
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