/*
  * Copyright (c) 2010, Google, Inc.
  *
  * 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
  */
 
 /**
  * @file
  * VP8 encoder support via libvpx
  */
 
 #define VPX_DISABLE_CTRL_TYPECHECKS 1
 #define VPX_CODEC_DISABLE_COMPAT    1
 #include <vpx/vpx_encoder.h>
 #include <vpx/vp8cx.h>
 
 #include "avcodec.h"

 #include "internal.h"

 #include "libavutil/avassert.h"

 #include "libvpx.h"

 #include "libavutil/base64.h"

 #include "libavutil/common.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/mathematics.h"

 #include "libavutil/opt.h"

 
 /**
  * Portion of struct vpx_codec_cx_pkt from vpx_encoder.h.
  * One encoded frame returned from the library.
  */
 struct FrameListData {

     void *buf;                       /**< compressed data buffer */
     size_t sz;                       /**< length of compressed data */

     void *buf_alpha;
     size_t sz_alpha;

     int64_t pts;                     /**< time stamp to show frame

                                           (in timebase units) */

     unsigned long duration;          /**< duration to show frame

                                           (in timebase units) */

     uint32_t flags;                  /**< flags for this frame */

     uint64_t sse[4];
     int have_sse;                    /**< true if we have pending sse[] */
     uint64_t frame_number;

     struct FrameListData *next;
 };
 
 typedef struct VP8EncoderContext {

     AVClass *class;

     struct vpx_codec_ctx encoder;
     struct vpx_image rawimg;

     struct vpx_codec_ctx encoder_alpha;
     struct vpx_image rawimg_alpha;
     uint8_t is_alpha;

     struct vpx_fixed_buf twopass_stats;

     int deadline; //i.e., RT/GOOD/BEST

     uint64_t sse[4];
     int have_sse; /**< true if we have pending sse[] */
     uint64_t frame_number;

     struct FrameListData *coded_frame_list;

     int cpu_used;

     /**
      * VP8 specific flags, see VP8F_* below.
      */
     int flags;
 #define VP8F_ERROR_RESILIENT 0x00000001 ///< Enable measures appropriate for streaming over lossy links
 #define VP8F_AUTO_ALT_REF    0x00000002 ///< Enable automatic alternate reference frame generation
 

     int auto_alt_ref;

 
     int arnr_max_frames;
     int arnr_strength;
     int arnr_type;

     int lag_in_frames;

     int error_resilient;

     int crf;

     int static_thresh;

     int max_intra_rate;

     int rc_undershoot_pct;

     int rc_overshoot_pct;

 
     // VP9-only
     int lossless;
     int tile_columns;
     int tile_rows;
     int frame_parallel;

     int aq_mode;

 } VP8Context;
 
 /** String mappings for enum vp8e_enc_control_id */

 static const char *const ctlidstr[] = {

     [VP8E_SET_CPUUSED]           = "VP8E_SET_CPUUSED",
     [VP8E_SET_ENABLEAUTOALTREF]  = "VP8E_SET_ENABLEAUTOALTREF",
     [VP8E_SET_NOISE_SENSITIVITY] = "VP8E_SET_NOISE_SENSITIVITY",
     [VP8E_SET_STATIC_THRESHOLD]  = "VP8E_SET_STATIC_THRESHOLD",
     [VP8E_SET_TOKEN_PARTITIONS]  = "VP8E_SET_TOKEN_PARTITIONS",
     [VP8E_SET_ARNR_MAXFRAMES]    = "VP8E_SET_ARNR_MAXFRAMES",
     [VP8E_SET_ARNR_STRENGTH]     = "VP8E_SET_ARNR_STRENGTH",
     [VP8E_SET_ARNR_TYPE]         = "VP8E_SET_ARNR_TYPE",

     [VP8E_SET_CQ_LEVEL]          = "VP8E_SET_CQ_LEVEL",

     [VP8E_SET_MAX_INTRA_BITRATE_PCT] = "VP8E_SET_MAX_INTRA_BITRATE_PCT",

 #if CONFIG_LIBVPX_VP9_ENCODER
     [VP9E_SET_LOSSLESS]                = "VP9E_SET_LOSSLESS",
     [VP9E_SET_TILE_COLUMNS]            = "VP9E_SET_TILE_COLUMNS",
     [VP9E_SET_TILE_ROWS]               = "VP9E_SET_TILE_ROWS",
     [VP9E_SET_FRAME_PARALLEL_DECODING] = "VP9E_SET_FRAME_PARALLEL_DECODING",

     [VP9E_SET_AQ_MODE]                 = "VP9E_SET_AQ_MODE",

 #if VPX_ENCODER_ABI_VERSION > 8
     [VP9E_SET_COLOR_SPACE]             = "VP9E_SET_COLOR_SPACE",
 #endif

 #endif

 };
 
 static av_cold void log_encoder_error(AVCodecContext *avctx, const char *desc)
 {
     VP8Context *ctx = avctx->priv_data;
     const char *error  = vpx_codec_error(&ctx->encoder);
     const char *detail = vpx_codec_error_detail(&ctx->encoder);
 
     av_log(avctx, AV_LOG_ERROR, "%s: %s\n", desc, error);
     if (detail)
         av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n", detail);
 }
 
 static av_cold void dump_enc_cfg(AVCodecContext *avctx,
                                  const struct vpx_codec_enc_cfg *cfg)
 {
     int width = -30;
     int level = AV_LOG_DEBUG;
 
     av_log(avctx, level, "vpx_codec_enc_cfg\n");
     av_log(avctx, level, "generic settings\n"
            "  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n"

 #if CONFIG_LIBVPX_VP9_ENCODER && defined(VPX_IMG_FMT_HIGHBITDEPTH)
            "  %*s%u\n  %*s%u\n"
 #endif

            "  %*s{%u/%u}\n  %*s%u\n  %*s%d\n  %*s%u\n",
            width, "g_usage:",           cfg->g_usage,
            width, "g_threads:",         cfg->g_threads,
            width, "g_profile:",         cfg->g_profile,
            width, "g_w:",               cfg->g_w,
            width, "g_h:",               cfg->g_h,

 #if CONFIG_LIBVPX_VP9_ENCODER && defined(VPX_IMG_FMT_HIGHBITDEPTH)
            width, "g_bit_depth:",       cfg->g_bit_depth,
            width, "g_input_bit_depth:", cfg->g_input_bit_depth,
 #endif

            width, "g_timebase:",        cfg->g_timebase.num, cfg->g_timebase.den,
            width, "g_error_resilient:", cfg->g_error_resilient,
            width, "g_pass:",            cfg->g_pass,
            width, "g_lag_in_frames:",   cfg->g_lag_in_frames);
     av_log(avctx, level, "rate control settings\n"
            "  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n"

            "  %*s%d\n  %*s%p(%"SIZE_SPECIFIER")\n  %*s%u\n",

            width, "rc_dropframe_thresh:",   cfg->rc_dropframe_thresh,
            width, "rc_resize_allowed:",     cfg->rc_resize_allowed,
            width, "rc_resize_up_thresh:",   cfg->rc_resize_up_thresh,
            width, "rc_resize_down_thresh:", cfg->rc_resize_down_thresh,
            width, "rc_end_usage:",          cfg->rc_end_usage,
            width, "rc_twopass_stats_in:",   cfg->rc_twopass_stats_in.buf, cfg->rc_twopass_stats_in.sz,
            width, "rc_target_bitrate:",     cfg->rc_target_bitrate);
     av_log(avctx, level, "quantizer settings\n"
            "  %*s%u\n  %*s%u\n",
            width, "rc_min_quantizer:", cfg->rc_min_quantizer,
            width, "rc_max_quantizer:", cfg->rc_max_quantizer);
     av_log(avctx, level, "bitrate tolerance\n"
            "  %*s%u\n  %*s%u\n",
            width, "rc_undershoot_pct:", cfg->rc_undershoot_pct,
            width, "rc_overshoot_pct:",  cfg->rc_overshoot_pct);
     av_log(avctx, level, "decoder buffer model\n"
             "  %*s%u\n  %*s%u\n  %*s%u\n",
             width, "rc_buf_sz:",         cfg->rc_buf_sz,
             width, "rc_buf_initial_sz:", cfg->rc_buf_initial_sz,
             width, "rc_buf_optimal_sz:", cfg->rc_buf_optimal_sz);
     av_log(avctx, level, "2 pass rate control settings\n"
            "  %*s%u\n  %*s%u\n  %*s%u\n",
            width, "rc_2pass_vbr_bias_pct:",       cfg->rc_2pass_vbr_bias_pct,
            width, "rc_2pass_vbr_minsection_pct:", cfg->rc_2pass_vbr_minsection_pct,
            width, "rc_2pass_vbr_maxsection_pct:", cfg->rc_2pass_vbr_maxsection_pct);
     av_log(avctx, level, "keyframing settings\n"
            "  %*s%d\n  %*s%u\n  %*s%u\n",
            width, "kf_mode:",     cfg->kf_mode,
            width, "kf_min_dist:", cfg->kf_min_dist,
            width, "kf_max_dist:", cfg->kf_max_dist);
     av_log(avctx, level, "\n");
 }
 
 static void coded_frame_add(void *list, struct FrameListData *cx_frame)
 {
     struct FrameListData **p = list;
 

     while (*p)

         p = &(*p)->next;
     *p = cx_frame;
     cx_frame->next = NULL;
 }
 
 static av_cold void free_coded_frame(struct FrameListData *cx_frame)
 {
     av_freep(&cx_frame->buf);

     if (cx_frame->buf_alpha)
         av_freep(&cx_frame->buf_alpha);

     av_freep(&cx_frame);
 }
 
 static av_cold void free_frame_list(struct FrameListData *list)
 {
     struct FrameListData *p = list;
 
     while (p) {
         list = list->next;
         free_coded_frame(p);
         p = list;
     }
 }
 
 static av_cold int codecctl_int(AVCodecContext *avctx,
                                 enum vp8e_enc_control_id id, int val)
 {
     VP8Context *ctx = avctx->priv_data;
     char buf[80];
     int width = -30;
     int res;
 
     snprintf(buf, sizeof(buf), "%s:", ctlidstr[id]);
     av_log(avctx, AV_LOG_DEBUG, "  %*s%d\n", width, buf, val);
 
     res = vpx_codec_control(&ctx->encoder, id, val);
     if (res != VPX_CODEC_OK) {
         snprintf(buf, sizeof(buf), "Failed to set %s codec control",
                  ctlidstr[id]);
         log_encoder_error(avctx, buf);
     }
 
     return res == VPX_CODEC_OK ? 0 : AVERROR(EINVAL);
 }
 
 static av_cold int vp8_free(AVCodecContext *avctx)
 {
     VP8Context *ctx = avctx->priv_data;
 
     vpx_codec_destroy(&ctx->encoder);

     if (ctx->is_alpha)
         vpx_codec_destroy(&ctx->encoder_alpha);

     av_freep(&ctx->twopass_stats.buf);
     av_freep(&avctx->stats_out);
     free_frame_list(ctx->coded_frame_list);
     return 0;
 }
 

 #if CONFIG_LIBVPX_VP9_ENCODER
 static int set_pix_fmt(AVCodecContext *avctx, vpx_codec_caps_t codec_caps,
                        struct vpx_codec_enc_cfg *enccfg, vpx_codec_flags_t *flags,

                        vpx_img_fmt_t *img_fmt)
 {

 #ifdef VPX_IMG_FMT_HIGHBITDEPTH
     enccfg->g_bit_depth = enccfg->g_input_bit_depth = 8;
 #endif
     switch (avctx->pix_fmt) {
     case AV_PIX_FMT_YUV420P:
         enccfg->g_profile = 0;
         *img_fmt = VPX_IMG_FMT_I420;
         return 0;
     case AV_PIX_FMT_YUV422P:

         enccfg->g_profile = 1;
         *img_fmt = VPX_IMG_FMT_I422;
         return 0;
 #if VPX_IMAGE_ABI_VERSION >= 3
     case AV_PIX_FMT_YUV440P:
         enccfg->g_profile = 1;
         *img_fmt = VPX_IMG_FMT_I440;
         return 0;
 #endif

     case AV_PIX_FMT_YUV444P:
         enccfg->g_profile = 1;

         *img_fmt = VPX_IMG_FMT_I444;

         return 0;
 #ifdef VPX_IMG_FMT_HIGHBITDEPTH
     case AV_PIX_FMT_YUV420P10LE:
     case AV_PIX_FMT_YUV420P12LE:
         if (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH) {
             enccfg->g_bit_depth = enccfg->g_input_bit_depth =
                 avctx->pix_fmt == AV_PIX_FMT_YUV420P10LE ? 10 : 12;
             enccfg->g_profile = 2;
             *img_fmt = VPX_IMG_FMT_I42016;
             *flags |= VPX_CODEC_USE_HIGHBITDEPTH;
             return 0;
         }
         break;
     case AV_PIX_FMT_YUV422P10LE:
     case AV_PIX_FMT_YUV422P12LE:
         if (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH) {
             enccfg->g_bit_depth = enccfg->g_input_bit_depth =
                 avctx->pix_fmt == AV_PIX_FMT_YUV422P10LE ? 10 : 12;
             enccfg->g_profile = 3;
             *img_fmt = VPX_IMG_FMT_I42216;
             *flags |= VPX_CODEC_USE_HIGHBITDEPTH;
             return 0;
         }
         break;

 #if VPX_IMAGE_ABI_VERSION >= 3
     case AV_PIX_FMT_YUV440P10LE:
     case AV_PIX_FMT_YUV440P12LE:
         if (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH) {
             enccfg->g_bit_depth = enccfg->g_input_bit_depth =
                 avctx->pix_fmt == AV_PIX_FMT_YUV440P10LE ? 10 : 12;
             enccfg->g_profile = 3;
             *img_fmt = VPX_IMG_FMT_I44016;
             *flags |= VPX_CODEC_USE_HIGHBITDEPTH;
             return 0;
         }
         break;
 #endif

     case AV_PIX_FMT_YUV444P10LE:
     case AV_PIX_FMT_YUV444P12LE:
         if (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH) {
             enccfg->g_bit_depth = enccfg->g_input_bit_depth =
                 avctx->pix_fmt == AV_PIX_FMT_YUV444P10LE ? 10 : 12;
             enccfg->g_profile = 3;
             *img_fmt = VPX_IMG_FMT_I44416;
             *flags |= VPX_CODEC_USE_HIGHBITDEPTH;
             return 0;
         }
         break;
 #endif
     default:
         break;
     }
     av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format.\n");
     return AVERROR_INVALIDDATA;
 }

 
 #if VPX_ENCODER_ABI_VERSION > 8
 static void set_colorspace(AVCodecContext *avctx)
 {
     enum vpx_color_space vpx_cs;
 
     switch (avctx->colorspace) {
     case AVCOL_SPC_RGB:         vpx_cs = VPX_CS_SRGB;      break;
     case AVCOL_SPC_BT709:       vpx_cs = VPX_CS_BT_709;    break;
     case AVCOL_SPC_UNSPECIFIED: vpx_cs = VPX_CS_UNKNOWN;   break;
     case AVCOL_SPC_RESERVED:    vpx_cs = VPX_CS_RESERVED;  break;
     case AVCOL_SPC_BT470BG:     vpx_cs = VPX_CS_BT_601;    break;
     case AVCOL_SPC_SMPTE170M:   vpx_cs = VPX_CS_SMPTE_170; break;
     case AVCOL_SPC_SMPTE240M:   vpx_cs = VPX_CS_SMPTE_240; break;
     case AVCOL_SPC_BT2020_NCL:  vpx_cs = VPX_CS_BT_2020;   break;
     default:
         av_log(avctx, AV_LOG_WARNING, "Unsupported colorspace (%d)\n",
                avctx->colorspace);
         return;
     }
     codecctl_int(avctx, VP9E_SET_COLOR_SPACE, vpx_cs);
 }
 #endif

 #endif
 

 static av_cold int vpx_init(AVCodecContext *avctx,
                             const struct vpx_codec_iface *iface)

 {
     VP8Context *ctx = avctx->priv_data;

     struct vpx_codec_enc_cfg enccfg = { 0 };

     struct vpx_codec_enc_cfg enccfg_alpha;

     vpx_codec_flags_t flags = (avctx->flags & AV_CODEC_FLAG_PSNR) ? VPX_CODEC_USE_PSNR : 0;

     int res;

     vpx_img_fmt_t img_fmt = VPX_IMG_FMT_I420;
 #if CONFIG_LIBVPX_VP9_ENCODER
     vpx_codec_caps_t codec_caps = vpx_codec_get_caps(iface);
 #endif

 
     av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
     av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
 

     if (avctx->pix_fmt == AV_PIX_FMT_YUVA420P)
         ctx->is_alpha = 1;
 

     if ((res = vpx_codec_enc_config_default(iface, &enccfg, 0)) != VPX_CODEC_OK) {
         av_log(avctx, AV_LOG_ERROR, "Failed to get config: %s\n",
                vpx_codec_err_to_string(res));
         return AVERROR(EINVAL);
     }

 #if CONFIG_LIBVPX_VP9_ENCODER
     if (avctx->codec_id == AV_CODEC_ID_VP9) {
         if (set_pix_fmt(avctx, codec_caps, &enccfg, &flags, &img_fmt))
             return AVERROR(EINVAL);
     }
 #endif
 

     if(!avctx->bit_rate)
         if(avctx->rc_max_rate || avctx->rc_buffer_size || avctx->rc_initial_buffer_occupancy) {
             av_log( avctx, AV_LOG_ERROR, "Rate control parameters set without a bitrate\n");
             return AVERROR(EINVAL);
         }
 

     dump_enc_cfg(avctx, &enccfg);
 
     enccfg.g_w            = avctx->width;
     enccfg.g_h            = avctx->height;
     enccfg.g_timebase.num = avctx->time_base.num;
     enccfg.g_timebase.den = avctx->time_base.den;
     enccfg.g_threads      = avctx->thread_count;

     enccfg.g_lag_in_frames= ctx->lag_in_frames;

     if (avctx->flags & AV_CODEC_FLAG_PASS1)

         enccfg.g_pass = VPX_RC_FIRST_PASS;

     else if (avctx->flags & AV_CODEC_FLAG_PASS2)

         enccfg.g_pass = VPX_RC_LAST_PASS;
     else
         enccfg.g_pass = VPX_RC_ONE_PASS;
 
     if (avctx->rc_min_rate == avctx->rc_max_rate &&

         avctx->rc_min_rate == avctx->bit_rate && avctx->bit_rate) {

         enccfg.rc_end_usage = VPX_CBR;

     } else if (ctx->crf >= 0) {

         enccfg.rc_end_usage = VPX_CQ;

 #if CONFIG_LIBVPX_VP9_ENCODER
         if (!avctx->bit_rate && avctx->codec_id == AV_CODEC_ID_VP9)
             enccfg.rc_end_usage = VPX_Q;
 #endif
     }

 
     if (avctx->bit_rate) {
         enccfg.rc_target_bitrate = av_rescale_rnd(avctx->bit_rate, 1, 1000,

                                                   AV_ROUND_NEAR_INF);
 #if CONFIG_LIBVPX_VP9_ENCODER
     } else if (enccfg.rc_end_usage == VPX_Q) {
 #endif

     } else {
         if (enccfg.rc_end_usage == VPX_CQ) {
             enccfg.rc_target_bitrate = 1000000;
         } else {
             avctx->bit_rate = enccfg.rc_target_bitrate * 1000;
             av_log(avctx, AV_LOG_WARNING,
                    "Neither bitrate nor constrained quality specified, using default bitrate of %dkbit/sec\n",
                    enccfg.rc_target_bitrate);
         }
     }
 

     if (avctx->codec_id == AV_CODEC_ID_VP9 && ctx->lossless == 1) {
         enccfg.rc_min_quantizer =
         enccfg.rc_max_quantizer = 0;
     } else {
         if (avctx->qmin >= 0)
             enccfg.rc_min_quantizer = avctx->qmin;
         if (avctx->qmax >= 0)
             enccfg.rc_max_quantizer = avctx->qmax;
     }

     if (enccfg.rc_end_usage == VPX_CQ
 #if CONFIG_LIBVPX_VP9_ENCODER
         || enccfg.rc_end_usage == VPX_Q
 #endif

        ) {

         if (ctx->crf < enccfg.rc_min_quantizer || ctx->crf > enccfg.rc_max_quantizer) {

             av_log(avctx, AV_LOG_ERROR,
                    "CQ level %d must be between minimum and maximum quantizer value (%d-%d)\n",
                    ctx->crf, enccfg.rc_min_quantizer, enccfg.rc_max_quantizer);
             return AVERROR(EINVAL);

         }
     }
 

     enccfg.rc_dropframe_thresh = avctx->frame_skip_threshold;

     //0-100 (0 => CBR, 100 => VBR)
     enccfg.rc_2pass_vbr_bias_pct           = round(avctx->qcompress * 100);

     if (avctx->bit_rate)

         enccfg.rc_2pass_vbr_minsection_pct =

             avctx->rc_min_rate * 100LL / avctx->bit_rate;

     if (avctx->rc_max_rate)
         enccfg.rc_2pass_vbr_maxsection_pct =

             avctx->rc_max_rate * 100LL / avctx->bit_rate;

     if (avctx->rc_buffer_size)
         enccfg.rc_buf_sz         =

             avctx->rc_buffer_size * 1000LL / avctx->bit_rate;

     if (avctx->rc_initial_buffer_occupancy)
         enccfg.rc_buf_initial_sz =

             avctx->rc_initial_buffer_occupancy * 1000LL / avctx->bit_rate;

     enccfg.rc_buf_optimal_sz     = enccfg.rc_buf_sz * 5 / 6;

 #if FF_API_MPV_OPT
     FF_DISABLE_DEPRECATION_WARNINGS
     if (avctx->rc_buffer_aggressivity != 1.0) {
         av_log(avctx, AV_LOG_WARNING, "The rc_buffer_aggressivity option is "
                "deprecated, use the undershoot-pct private option instead.\n");

         enccfg.rc_undershoot_pct = round(avctx->rc_buffer_aggressivity * 100);

     }
     FF_ENABLE_DEPRECATION_WARNINGS
 #endif
     if (ctx->rc_undershoot_pct >= 0)
         enccfg.rc_undershoot_pct = ctx->rc_undershoot_pct;

     if (ctx->rc_overshoot_pct >= 0)
         enccfg.rc_overshoot_pct = ctx->rc_overshoot_pct;

     //_enc_init() will balk if kf_min_dist differs from max w/VPX_KF_AUTO

     if (avctx->keyint_min >= 0 && avctx->keyint_min == avctx->gop_size)

         enccfg.kf_min_dist = avctx->keyint_min;

     if (avctx->gop_size >= 0)
         enccfg.kf_max_dist = avctx->gop_size;

 
     if (enccfg.g_pass == VPX_RC_FIRST_PASS)
         enccfg.g_lag_in_frames = 0;
     else if (enccfg.g_pass == VPX_RC_LAST_PASS) {

         int decode_size, ret;

 
         if (!avctx->stats_in) {
             av_log(avctx, AV_LOG_ERROR, "No stats file for second pass\n");
             return AVERROR_INVALIDDATA;
         }
 
         ctx->twopass_stats.sz  = strlen(avctx->stats_in) * 3 / 4;

         ret = av_reallocp(&ctx->twopass_stats.buf, ctx->twopass_stats.sz);
         if (ret < 0) {

             av_log(avctx, AV_LOG_ERROR,

                    "Stat buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",

                    ctx->twopass_stats.sz);

             ctx->twopass_stats.sz = 0;

             return ret;

         }
         decode_size = av_base64_decode(ctx->twopass_stats.buf, avctx->stats_in,
                                        ctx->twopass_stats.sz);
         if (decode_size < 0) {
             av_log(avctx, AV_LOG_ERROR, "Stat buffer decode failed\n");
             return AVERROR_INVALIDDATA;
         }
 
         ctx->twopass_stats.sz      = decode_size;
         enccfg.rc_twopass_stats_in = ctx->twopass_stats;
     }
 

     /* 0-3: For non-zero values the encoder increasingly optimizes for reduced
        complexity playback on low powered devices at the expense of encode
        quality. */

     if (avctx->profile != FF_PROFILE_UNKNOWN)
         enccfg.g_profile = avctx->profile;

     enccfg.g_error_resilient = ctx->error_resilient || ctx->flags & VP8F_ERROR_RESILIENT;

     dump_enc_cfg(avctx, &enccfg);
     /* Construct Encoder Context */

     res = vpx_codec_enc_init(&ctx->encoder, iface, &enccfg, flags);

     if (res != VPX_CODEC_OK) {
         log_encoder_error(avctx, "Failed to initialize encoder");
         return AVERROR(EINVAL);
     }
 

     if (ctx->is_alpha) {
         enccfg_alpha = enccfg;
         res = vpx_codec_enc_init(&ctx->encoder_alpha, iface, &enccfg_alpha, flags);
         if (res != VPX_CODEC_OK) {
             log_encoder_error(avctx, "Failed to initialize alpha encoder");
             return AVERROR(EINVAL);
         }
     }
 

     //codec control failures are currently treated only as warnings
     av_log(avctx, AV_LOG_DEBUG, "vpx_codec_control\n");

     codecctl_int(avctx, VP8E_SET_CPUUSED,          ctx->cpu_used);

     if (ctx->flags & VP8F_AUTO_ALT_REF)
         ctx->auto_alt_ref = 1;

     if (ctx->auto_alt_ref >= 0)
         codecctl_int(avctx, VP8E_SET_ENABLEAUTOALTREF, ctx->auto_alt_ref);
     if (ctx->arnr_max_frames >= 0)
         codecctl_int(avctx, VP8E_SET_ARNR_MAXFRAMES,   ctx->arnr_max_frames);
     if (ctx->arnr_strength >= 0)
         codecctl_int(avctx, VP8E_SET_ARNR_STRENGTH,    ctx->arnr_strength);
     if (ctx->arnr_type >= 0)
         codecctl_int(avctx, VP8E_SET_ARNR_TYPE,        ctx->arnr_type);

     if (CONFIG_LIBVPX_VP8_ENCODER && avctx->codec_id == AV_CODEC_ID_VP8) {

         codecctl_int(avctx, VP8E_SET_NOISE_SENSITIVITY, avctx->noise_reduction);

         codecctl_int(avctx, VP8E_SET_TOKEN_PARTITIONS,  av_log2(avctx->slices));

     }

 #if FF_API_MPV_OPT
     FF_DISABLE_DEPRECATION_WARNINGS
     if (avctx->mb_threshold) {
         av_log(avctx, AV_LOG_WARNING, "The mb_threshold option is deprecated, "
                "use the static-thresh private option instead.\n");
         ctx->static_thresh = avctx->mb_threshold;
     }
     FF_ENABLE_DEPRECATION_WARNINGS
 #endif
     codecctl_int(avctx, VP8E_SET_STATIC_THRESHOLD,  ctx->static_thresh);

     if (ctx->crf >= 0)
         codecctl_int(avctx, VP8E_SET_CQ_LEVEL,          ctx->crf);

     if (ctx->max_intra_rate >= 0)
         codecctl_int(avctx, VP8E_SET_MAX_INTRA_BITRATE_PCT, ctx->max_intra_rate);

 #if CONFIG_LIBVPX_VP9_ENCODER
     if (avctx->codec_id == AV_CODEC_ID_VP9) {
         if (ctx->lossless >= 0)
             codecctl_int(avctx, VP9E_SET_LOSSLESS, ctx->lossless);
         if (ctx->tile_columns >= 0)
             codecctl_int(avctx, VP9E_SET_TILE_COLUMNS, ctx->tile_columns);
         if (ctx->tile_rows >= 0)
             codecctl_int(avctx, VP9E_SET_TILE_ROWS, ctx->tile_rows);
         if (ctx->frame_parallel >= 0)
             codecctl_int(avctx, VP9E_SET_FRAME_PARALLEL_DECODING, ctx->frame_parallel);

         if (ctx->aq_mode >= 0)
             codecctl_int(avctx, VP9E_SET_AQ_MODE, ctx->aq_mode);

 #if VPX_ENCODER_ABI_VERSION > 8
         set_colorspace(avctx);
 #endif

     }
 #endif
 

     av_log(avctx, AV_LOG_DEBUG, "Using deadline: %d\n", ctx->deadline);

 
     //provide dummy value to initialize wrapper, values will be updated each _encode()

     vpx_img_wrap(&ctx->rawimg, img_fmt, avctx->width, avctx->height, 1,

                  (unsigned char*)1);

 #if CONFIG_LIBVPX_VP9_ENCODER && defined(VPX_IMG_FMT_HIGHBITDEPTH)
     if (avctx->codec_id == AV_CODEC_ID_VP9 && (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH))
         ctx->rawimg.bit_depth = enccfg.g_bit_depth;
 #endif

     if (ctx->is_alpha)
         vpx_img_wrap(&ctx->rawimg_alpha, VPX_IMG_FMT_I420, avctx->width, avctx->height, 1,
                      (unsigned char*)1);
 

     return 0;
 }
 
 static inline void cx_pktcpy(struct FrameListData *dst,

                              const struct vpx_codec_cx_pkt *src,

                              const struct vpx_codec_cx_pkt *src_alpha,

                              VP8Context *ctx)

 {
     dst->pts      = src->data.frame.pts;
     dst->duration = src->data.frame.duration;
     dst->flags    = src->data.frame.flags;
     dst->sz       = src->data.frame.sz;
     dst->buf      = src->data.frame.buf;

     dst->have_sse = 0;
     /* For alt-ref frame, don't store PSNR or increment frame_number */
     if (!(dst->flags & VPX_FRAME_IS_INVISIBLE)) {
         dst->frame_number = ++ctx->frame_number;
         dst->have_sse = ctx->have_sse;
         if (ctx->have_sse) {
             /* associate last-seen SSE to the frame. */
             /* Transfers ownership from ctx to dst. */
             /* WARNING! This makes the assumption that PSNR_PKT comes
                just before the frame it refers to! */
             memcpy(dst->sse, ctx->sse, sizeof(dst->sse));
             ctx->have_sse = 0;
         }
     } else {
         dst->frame_number = -1;   /* sanity marker */
     }

     if (src_alpha) {
         dst->buf_alpha = src_alpha->data.frame.buf;
         dst->sz_alpha = src_alpha->data.frame.sz;

     } else {

         dst->buf_alpha = NULL;
         dst->sz_alpha = 0;
     }

 }
 
 /**

  * Store coded frame information in format suitable for return from encode2().

  *

  * Write information from @a cx_frame to @a pkt
  * @return packet data size on success
  * @return a negative AVERROR on error

  */
 static int storeframe(AVCodecContext *avctx, struct FrameListData *cx_frame,

                       AVPacket *pkt)

 {

     int ret = ff_alloc_packet2(avctx, pkt, cx_frame->sz, 0);

     uint8_t *side_data;

     if (ret >= 0) {

         int pict_type;

         memcpy(pkt->data, cx_frame->buf, pkt->size);

         pkt->pts = pkt->dts = cx_frame->pts;

 #if FF_API_CODED_FRAME
 FF_DISABLE_DEPRECATION_WARNINGS

         avctx->coded_frame->pts       = cx_frame->pts;
         avctx->coded_frame->key_frame = !!(cx_frame->flags & VPX_FRAME_IS_KEY);

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

         if (!!(cx_frame->flags & VPX_FRAME_IS_KEY)) {

             pict_type = AV_PICTURE_TYPE_I;

 #if FF_API_CODED_FRAME
 FF_DISABLE_DEPRECATION_WARNINGS

             avctx->coded_frame->pict_type = pict_type;

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

             pkt->flags |= AV_PKT_FLAG_KEY;
         } else {

             pict_type = AV_PICTURE_TYPE_P;

 #if FF_API_CODED_FRAME
 FF_DISABLE_DEPRECATION_WARNINGS

             avctx->coded_frame->pict_type = pict_type;

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

         }

         ff_side_data_set_encoder_stats(pkt, 0, cx_frame->sse + 1,
                                        cx_frame->have_sse ? 3 : 0, pict_type);
 

         if (cx_frame->have_sse) {
             int i;
             /* Beware of the Y/U/V/all order! */

 #if FF_API_CODED_FRAME
 FF_DISABLE_DEPRECATION_WARNINGS

             avctx->coded_frame->error[0] = cx_frame->sse[1];
             avctx->coded_frame->error[1] = cx_frame->sse[2];
             avctx->coded_frame->error[2] = cx_frame->sse[3];
             avctx->coded_frame->error[3] = 0;    // alpha

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
             for (i = 0; i < 3; ++i) {
                 avctx->error[i] += cx_frame->sse[i + 1];

             }
             cx_frame->have_sse = 0;
         }

         if (cx_frame->sz_alpha > 0) {
             side_data = av_packet_new_side_data(pkt,
                                                 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
                                                 cx_frame->sz_alpha + 8);

             if(!side_data) {

                 av_free_packet(pkt);
                 av_free(pkt);
                 return AVERROR(ENOMEM);
             }
             AV_WB64(side_data, 1);
             memcpy(side_data + 8, cx_frame->buf_alpha, cx_frame->sz_alpha);
         }

     } else {

         return ret;

     }

     return pkt->size;

 }
 
 /**
  * Queue multiple output frames from the encoder, returning the front-most.
  * In cases where vpx_codec_get_cx_data() returns more than 1 frame append
  * the frame queue. Return the head frame if available.
  * @return Stored frame size
  * @return AVERROR(EINVAL) on output size error
  * @return AVERROR(ENOMEM) on coded frame queue data allocation error
  */

 static int queue_frames(AVCodecContext *avctx, AVPacket *pkt_out)

 {
     VP8Context *ctx = avctx->priv_data;
     const struct vpx_codec_cx_pkt *pkt;

     const struct vpx_codec_cx_pkt *pkt_alpha = NULL;

     const void *iter = NULL;

     const void *iter_alpha = NULL;

     int size = 0;
 
     if (ctx->coded_frame_list) {
         struct FrameListData *cx_frame = ctx->coded_frame_list;
         /* return the leading frame if we've already begun queueing */

         size = storeframe(avctx, cx_frame, pkt_out);

         if (size < 0)

             return size;

         ctx->coded_frame_list = cx_frame->next;
         free_coded_frame(cx_frame);
     }
 
     /* consume all available output from the encoder before returning. buffers
        are only good through the next vpx_codec call */

     while ((pkt = vpx_codec_get_cx_data(&ctx->encoder, &iter)) &&

            (!ctx->is_alpha ||
             (ctx->is_alpha && (pkt_alpha = vpx_codec_get_cx_data(&ctx->encoder_alpha, &iter_alpha))))) {

         switch (pkt->kind) {
         case VPX_CODEC_CX_FRAME_PKT:
             if (!size) {
                 struct FrameListData cx_frame;
 
                 /* avoid storing the frame when the list is empty and we haven't yet
                    provided a frame for output */

                 av_assert0(!ctx->coded_frame_list);

                 cx_pktcpy(&cx_frame, pkt, pkt_alpha, ctx);

                 size = storeframe(avctx, &cx_frame, pkt_out);

                 if (size < 0)

                     return size;

             } else {
                 struct FrameListData *cx_frame =
                     av_malloc(sizeof(struct FrameListData));
 
                 if (!cx_frame) {
                     av_log(avctx, AV_LOG_ERROR,
                            "Frame queue element alloc failed\n");
                     return AVERROR(ENOMEM);
                 }

                 cx_pktcpy(cx_frame, pkt, pkt_alpha, ctx);

                 cx_frame->buf = av_malloc(cx_frame->sz);
 
                 if (!cx_frame->buf) {
                     av_log(avctx, AV_LOG_ERROR,

                            "Data buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",

                            cx_frame->sz);

                     av_freep(&cx_frame);

                     return AVERROR(ENOMEM);
                 }
                 memcpy(cx_frame->buf, pkt->data.frame.buf, pkt->data.frame.sz);

                 if (ctx->is_alpha) {
                     cx_frame->buf_alpha = av_malloc(cx_frame->sz_alpha);
                     if (!cx_frame->buf_alpha) {
                         av_log(avctx, AV_LOG_ERROR,

                                "Data buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",

                                cx_frame->sz_alpha);
                         av_free(cx_frame);
                         return AVERROR(ENOMEM);
                     }
                     memcpy(cx_frame->buf_alpha, pkt_alpha->data.frame.buf, pkt_alpha->data.frame.sz);
                 }

                 coded_frame_add(&ctx->coded_frame_list, cx_frame);
             }
             break;
         case VPX_CODEC_STATS_PKT: {
             struct vpx_fixed_buf *stats = &ctx->twopass_stats;

             int err;
             if ((err = av_reallocp(&stats->buf,
                                    stats->sz +
                                    pkt->data.twopass_stats.sz)) < 0) {
                 stats->sz = 0;

                 av_log(avctx, AV_LOG_ERROR, "Stat buffer realloc failed\n");

                 return err;

             }
             memcpy((uint8_t*)stats->buf + stats->sz,
                    pkt->data.twopass_stats.buf, pkt->data.twopass_stats.sz);
             stats->sz += pkt->data.twopass_stats.sz;
             break;
         }

         case VPX_CODEC_PSNR_PKT:
             av_assert0(!ctx->have_sse);
             ctx->sse[0] = pkt->data.psnr.sse[0];
             ctx->sse[1] = pkt->data.psnr.sse[1];
             ctx->sse[2] = pkt->data.psnr.sse[2];
             ctx->sse[3] = pkt->data.psnr.sse[3];
             ctx->have_sse = 1;
             break;

         case VPX_CODEC_CUSTOM_PKT:
             //ignore unsupported/unrecognized packet types
             break;
         }
     }
 
     return size;
 }
 

 static int vp8_encode(AVCodecContext *avctx, AVPacket *pkt,
                       const AVFrame *frame, int *got_packet)

 {
     VP8Context *ctx = avctx->priv_data;
     struct vpx_image *rawimg = NULL;

     struct vpx_image *rawimg_alpha = NULL;

     int64_t timestamp = 0;
     int res, coded_size;

     vpx_enc_frame_flags_t flags = 0;

 
     if (frame) {
         rawimg                      = &ctx->rawimg;
         rawimg->planes[VPX_PLANE_Y] = frame->data[0];
         rawimg->planes[VPX_PLANE_U] = frame->data[1];
         rawimg->planes[VPX_PLANE_V] = frame->data[2];
         rawimg->stride[VPX_PLANE_Y] = frame->linesize[0];
         rawimg->stride[VPX_PLANE_U] = frame->linesize[1];
         rawimg->stride[VPX_PLANE_V] = frame->linesize[2];

         if (ctx->is_alpha) {
             uint8_t *u_plane, *v_plane;
             rawimg_alpha = &ctx->rawimg_alpha;
             rawimg_alpha->planes[VPX_PLANE_Y] = frame->data[3];
             u_plane = av_malloc(frame->linesize[1] * frame->height);

             v_plane = av_malloc(frame->linesize[2] * frame->height);
             if (!u_plane || !v_plane) {
                 av_free(u_plane);
                 av_free(v_plane);
                 return AVERROR(ENOMEM);
             }

             memset(u_plane, 0x80, frame->linesize[1] * frame->height);
             rawimg_alpha->planes[VPX_PLANE_U] = u_plane;
             memset(v_plane, 0x80, frame->linesize[2] * frame->height);
             rawimg_alpha->planes[VPX_PLANE_V] = v_plane;

             rawimg_alpha->stride[VPX_PLANE_Y] = frame->linesize[0];
             rawimg_alpha->stride[VPX_PLANE_U] = frame->linesize[1];
             rawimg_alpha->stride[VPX_PLANE_V] = frame->linesize[2];

         }

         timestamp                   = frame->pts;

         if (frame->pict_type == AV_PICTURE_TYPE_I)
             flags |= VPX_EFLAG_FORCE_KF;

     }
 
     res = vpx_codec_encode(&ctx->encoder, rawimg, timestamp,

                            avctx->ticks_per_frame, flags, ctx->deadline);

     if (res != VPX_CODEC_OK) {
         log_encoder_error(avctx, "Error encoding frame");
         return AVERROR_INVALIDDATA;
     }

 
     if (ctx->is_alpha) {
         res = vpx_codec_encode(&ctx->encoder_alpha, rawimg_alpha, timestamp,
                                avctx->ticks_per_frame, flags, ctx->deadline);
         if (res != VPX_CODEC_OK) {
             log_encoder_error(avctx, "Error encoding alpha frame");
             return AVERROR_INVALIDDATA;
         }
     }
 

     coded_size = queue_frames(avctx, pkt);

     if (!frame && avctx->flags & AV_CODEC_FLAG_PASS1) {

         unsigned int b64_size = AV_BASE64_SIZE(ctx->twopass_stats.sz);

 
         avctx->stats_out = av_malloc(b64_size);
         if (!avctx->stats_out) {
             av_log(avctx, AV_LOG_ERROR, "Stat buffer alloc (%d bytes) failed\n",
                    b64_size);
             return AVERROR(ENOMEM);
         }
         av_base64_encode(avctx->stats_out, b64_size, ctx->twopass_stats.buf,
                          ctx->twopass_stats.sz);
     }

     if (rawimg_alpha) {

         av_freep(&rawimg_alpha->planes[VPX_PLANE_U]);
         av_freep(&rawimg_alpha->planes[VPX_PLANE_V]);

     }
 

     *got_packet = !!coded_size;
     return 0;

 }
 

 #define OFFSET(x) offsetof(VP8Context, x)

 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

 
 #ifndef VPX_ERROR_RESILIENT_DEFAULT
 #define VPX_ERROR_RESILIENT_DEFAULT 1
 #define VPX_ERROR_RESILIENT_PARTITIONS 2

 #endif

 
 #define COMMON_OPTIONS \

     { "cpu-used",        "Quality/Speed ratio modifier",           OFFSET(cpu_used),        AV_OPT_TYPE_INT, {.i64 = 1},       -16,     16,      VE}, \

     { "auto-alt-ref",    "Enable use of alternate reference " \
                          "frames (2-pass only)",                   OFFSET(auto_alt_ref),    AV_OPT_TYPE_INT, {.i64 = -1},      -1,      1,       VE}, \
     { "lag-in-frames",   "Number of frames to look ahead for " \
                          "alternate reference frame selection",    OFFSET(lag_in_frames),   AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE}, \
     { "arnr-maxframes",  "altref noise reduction max frame count", OFFSET(arnr_max_frames), AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE}, \
     { "arnr-strength",   "altref noise reduction filter strength", OFFSET(arnr_strength),   AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE}, \
     { "arnr-type",       "altref noise reduction filter type",     OFFSET(arnr_type),       AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE, "arnr_type"}, \
     { "backward",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, VE, "arnr_type" }, \
     { "forward",         NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, VE, "arnr_type" }, \
     { "centered",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 0, VE, "arnr_type" }, \
     { "deadline",        "Time to spend encoding, in microseconds.", OFFSET(deadline),      AV_OPT_TYPE_INT, {.i64 = VPX_DL_GOOD_QUALITY}, INT_MIN, INT_MAX, VE, "quality"}, \
     { "best",            NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VPX_DL_BEST_QUALITY}, 0, 0, VE, "quality"}, \
     { "good",            NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VPX_DL_GOOD_QUALITY}, 0, 0, VE, "quality"}, \
     { "realtime",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VPX_DL_REALTIME},     0, 0, VE, "quality"}, \
     { "error-resilient", "Error resilience configuration", OFFSET(error_resilient), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, VE, "er"}, \
     { "max-intra-rate",  "Maximum I-frame bitrate (pct) 0=unlimited",  OFFSET(max_intra_rate),  AV_OPT_TYPE_INT,  {.i64 = -1}, -1,      INT_MAX, VE}, \
     { "default",         "Improve resiliency against losses of whole frames", 0, AV_OPT_TYPE_CONST, {.i64 = VPX_ERROR_RESILIENT_DEFAULT}, 0, 0, VE, "er"}, \
     { "partitions",      "The frame partitions are independently decodable " \
                          "by the bool decoder, meaning that partitions can be decoded even " \
                          "though earlier partitions have been lost. Note that intra predicition" \
                          " is still done over the partition boundary.",       0, AV_OPT_TYPE_CONST, {.i64 = VPX_ERROR_RESILIENT_PARTITIONS}, 0, 0, VE, "er"}, \

     { "crf",              "Select the quality for constant quality mode", offsetof(VP8Context, crf), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, VE }, \

     { "static-thresh",    "A change threshold on blocks below which they will be skipped by the encoder", OFFSET(static_thresh), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE }, \

     { "undershoot-pct",  "Datarate undershoot (min) target (%)", OFFSET(rc_undershoot_pct), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 100, VE }, \

     { "overshoot-pct",   "Datarate overshoot (max) target (%)", OFFSET(rc_overshoot_pct), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1000, VE }, \

 
 #define LEGACY_OPTIONS \

     {"speed", "", offsetof(VP8Context, cpu_used), AV_OPT_TYPE_INT, {.i64 = 1}, -16, 16, VE}, \

     {"quality", "", offsetof(VP8Context, deadline), AV_OPT_TYPE_INT, {.i64 = VPX_DL_GOOD_QUALITY}, INT_MIN, INT_MAX, VE, "quality"}, \

     {"vp8flags", "", offsetof(VP8Context, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, UINT_MAX, VE, "flags"}, \

     {"error_resilient", "enable error resilience", 0, AV_OPT_TYPE_CONST, {.i64 = VP8F_ERROR_RESILIENT}, INT_MIN, INT_MAX, VE, "flags"}, \
     {"altref", "enable use of alternate reference frames (VP8/2-pass only)", 0, AV_OPT_TYPE_CONST, {.i64 = VP8F_AUTO_ALT_REF}, INT_MIN, INT_MAX, VE, "flags"}, \

     {"arnr_max_frames", "altref noise reduction max frame count", offsetof(VP8Context, arnr_max_frames), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 15, VE}, \
     {"arnr_strength", "altref noise reduction filter strength", offsetof(VP8Context, arnr_strength), AV_OPT_TYPE_INT, {.i64 = 3}, 0, 6, VE}, \
     {"arnr_type", "altref noise reduction filter type", offsetof(VP8Context, arnr_type), AV_OPT_TYPE_INT, {.i64 = 3}, 1, 3, VE}, \
     {"rc_lookahead", "Number of frames to look ahead for alternate reference frame selection", offsetof(VP8Context, lag_in_frames), AV_OPT_TYPE_INT, {.i64 = 25}, 0, 25, VE}, \
 
 #if CONFIG_LIBVPX_VP8_ENCODER
 static const AVOption vp8_options[] = {
     COMMON_OPTIONS
     LEGACY_OPTIONS

     { NULL }
 };

 #endif
 
 #if CONFIG_LIBVPX_VP9_ENCODER
 static const AVOption vp9_options[] = {
     COMMON_OPTIONS

     { "lossless",        "Lossless mode",                               OFFSET(lossless),        AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, VE},
     { "tile-columns",    "Number of tile columns to use, log2",         OFFSET(tile_columns),    AV_OPT_TYPE_INT, {.i64 = -1}, -1, 6, VE},
     { "tile-rows",       "Number of tile rows to use, log2",            OFFSET(tile_rows),       AV_OPT_TYPE_INT, {.i64 = -1}, -1, 2, VE},
     { "frame-parallel",  "Enable frame parallel decodability features", OFFSET(frame_parallel),  AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, VE},

     { "aq-mode",         "adaptive quantization mode",                  OFFSET(aq_mode),         AV_OPT_TYPE_INT, {.i64 = -1}, -1, 3, VE, "aq_mode"},

     { "none",            "Aq not used",         0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, VE, "aq_mode" },
     { "variance",        "Variance based Aq",   0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, VE, "aq_mode" },
     { "complexity",      "Complexity based Aq", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, VE, "aq_mode" },
     { "cyclic",          "Cyclic Refresh Aq",   0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 0, VE, "aq_mode" },

     LEGACY_OPTIONS
     { NULL }
 };
 #endif
 
 #undef COMMON_OPTIONS
 #undef LEGACY_OPTIONS

 static const AVCodecDefault defaults[] = {
     { "qmin",             "-1" },
     { "qmax",             "-1" },
     { "g",                "-1" },
     { "keyint_min",       "-1" },
     { NULL },
 };
 

 #if CONFIG_LIBVPX_VP8_ENCODER
 static av_cold int vp8_init(AVCodecContext *avctx)
 {

     return vpx_init(avctx, vpx_codec_vp8_cx());

 }
 
 static const AVClass class_vp8 = {

     .class_name = "libvpx-vp8 encoder",

     .item_name  = av_default_item_name,

     .option     = vp8_options,

     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 AVCodec ff_libvpx_vp8_encoder = {

     .name           = "libvpx",

     .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP8"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_VP8,

     .priv_data_size = sizeof(VP8Context),
     .init           = vp8_init,

     .encode2        = vp8_encode,

     .close          = vp8_free,

     .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS,

     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE },

     .priv_class     = &class_vp8,

     .defaults       = defaults,

 };

 #endif /* CONFIG_LIBVPX_VP8_ENCODER */

 #if CONFIG_LIBVPX_VP9_ENCODER

 static av_cold int vp9_init(AVCodecContext *avctx)
 {

     return vpx_init(avctx, vpx_codec_vp9_cx());

 }
 
 static const AVClass class_vp9 = {

     .class_name = "libvpx-vp9 encoder",

     .item_name  = av_default_item_name,

     .option     = vp9_options,

     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 static const AVProfile profiles[] = {
     { FF_PROFILE_VP9_0, "Profile 0" },
     { FF_PROFILE_VP9_1, "Profile 1" },
     { FF_PROFILE_VP9_2, "Profile 2" },
     { FF_PROFILE_VP9_3, "Profile 3" },
     { FF_PROFILE_UNKNOWN },
 };
 

 AVCodec ff_libvpx_vp9_encoder = {
     .name           = "libvpx-vp9",

     .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP9"),

     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_VP9,
     .priv_data_size = sizeof(VP8Context),
     .init           = vp9_init,
     .encode2        = vp8_encode,
     .close          = vp8_free,

     .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS,

     .profiles       = NULL_IF_CONFIG_SMALL(profiles),

     .priv_class     = &class_vp9,

     .defaults       = defaults,

     .init_static_data = ff_vp9_init_static,

 };

 #endif /* CONFIG_LIBVPX_VP9_ENCODER */