vp9_cx_iface.c 37.7 KB
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/*
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 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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 *
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 *  Use of this source code is governed by a BSD-style license
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 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
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 *  in the file PATENTS.  All contributing project authors may
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 *  be found in the AUTHORS file in the root of the source tree.
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 */


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#include "vpx/vpx_codec.h"
#include "vpx/internal/vpx_codec_internal.h"
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#include "vpx_version.h"
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#include "vp9/encoder/onyx_int.h"
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#include "vpx/vp8cx.h"
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#include "vp9/encoder/firstpass.h"
#include "vp9/common/onyx.h"
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#include <stdlib.h>
#include <string.h>

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struct vp8_extracfg {
  struct vpx_codec_pkt_list *pkt_list;
  int                         cpu_used;                    /** available cpu percentage in 1/16*/
  unsigned int                enable_auto_alt_ref;           /** if encoder decides to uses alternate reference frame */
  unsigned int                noise_sensitivity;
  unsigned int                Sharpness;
  unsigned int                static_thresh;
  unsigned int                token_partitions;
  unsigned int                arnr_max_frames;    /* alt_ref Noise Reduction Max Frame Count */
  unsigned int                arnr_strength;    /* alt_ref Noise Reduction Strength */
  unsigned int                arnr_type;        /* alt_ref filter type */
  unsigned int                experimental;
  vp8e_tuning                 tuning;
  unsigned int                cq_level;         /* constrained quality level */
  unsigned int                rc_max_intra_bitrate_pct;
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#if CONFIG_LOSSLESS
  unsigned int                lossless;
#endif
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};

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struct extraconfig_map {
  int                 usage;
  struct vp8_extracfg cfg;
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};

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static const struct extraconfig_map extracfg_map[] = {
  {
    0,
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    {
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      NULL,
      0,                          /* cpu_used      */
      0,                          /* enable_auto_alt_ref */
      0,                          /* noise_sensitivity */
      0,                          /* Sharpness */
      0,                          /* static_thresh */
      VP8_ONE_TOKENPARTITION,     /* token_partitions */
      0,                          /* arnr_max_frames */
      3,                          /* arnr_strength */
      3,                          /* arnr_type*/
      0,                          /* experimental mode */
      0,                          /* tuning*/
      10,                         /* cq_level */
      0,                          /* rc_max_intra_bitrate_pct */
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#if CONFIG_LOSSLESS
      0,                          /* lossless */
#endif
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    }
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  }
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};

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struct vpx_codec_alg_priv {
  vpx_codec_priv_t        base;
  vpx_codec_enc_cfg_t     cfg;
  struct vp8_extracfg     vp8_cfg;
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  VP9_CONFIG              oxcf;
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  VP9_PTR             cpi;
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  unsigned char          *cx_data;
  unsigned int            cx_data_sz;
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  unsigned char           *altref_cx_data;
  unsigned int            altref_size;
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  vpx_image_t             preview_img;
  unsigned int            next_frame_flag;
  vp8_postproc_cfg_t      preview_ppcfg;
  vpx_codec_pkt_list_decl(64) pkt_list;              // changed to accomendate the maximum number of lagged frames allowed
  unsigned int                fixed_kf_cntr;
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};


static vpx_codec_err_t
update_error_state(vpx_codec_alg_priv_t                 *ctx,
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                   const struct vpx_internal_error_info *error) {
  vpx_codec_err_t res;
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  if ((res = error->error_code))
    ctx->base.err_detail = error->has_detail
                           ? error->detail
                           : NULL;
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  return res;
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}


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#undef ERROR
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#define ERROR(str) do {\
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    ctx->base.err_detail = str;\
    return VPX_CODEC_INVALID_PARAM;\
  } while(0)
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#define RANGE_CHECK(p,memb,lo,hi) do {\
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    if(!(((p)->memb == lo || (p)->memb > (lo)) && (p)->memb <= hi)) \
      ERROR(#memb " out of range ["#lo".."#hi"]");\
  } while(0)
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#define RANGE_CHECK_HI(p,memb,hi) do {\
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    if(!((p)->memb <= (hi))) \
      ERROR(#memb " out of range [.."#hi"]");\
  } while(0)
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#define RANGE_CHECK_LO(p,memb,lo) do {\
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    if(!((p)->memb >= (lo))) \
      ERROR(#memb " out of range ["#lo"..]");\
  } while(0)
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#define RANGE_CHECK_BOOL(p,memb) do {\
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    if(!!((p)->memb) != (p)->memb) ERROR(#memb " expected boolean");\
  } while(0)
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static vpx_codec_err_t validate_config(vpx_codec_alg_priv_t      *ctx,
                                       const vpx_codec_enc_cfg_t *cfg,
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                                       const struct vp8_extracfg *vp8_cfg) {
  RANGE_CHECK(cfg, g_w,                   1, 16383); /* 14 bits available */
  RANGE_CHECK(cfg, g_h,                   1, 16383); /* 14 bits available */
  RANGE_CHECK(cfg, g_timebase.den,        1, 1000000000);
  RANGE_CHECK(cfg, g_timebase.num,        1, cfg->g_timebase.den);
  RANGE_CHECK_HI(cfg, g_profile,          3);
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  RANGE_CHECK_HI(cfg, rc_max_quantizer,   63);
  RANGE_CHECK_HI(cfg, rc_min_quantizer,   cfg->rc_max_quantizer);
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#if CONFIG_LOSSLESS
  RANGE_CHECK_BOOL(vp8_cfg, lossless);
  if (vp8_cfg->lossless) {
    RANGE_CHECK_HI(cfg, rc_max_quantizer, 0);
    RANGE_CHECK_HI(cfg, rc_min_quantizer, 0);
  }
#endif

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  RANGE_CHECK_HI(cfg, g_threads,          64);
  RANGE_CHECK_HI(cfg, g_lag_in_frames,    MAX_LAG_BUFFERS);
  RANGE_CHECK(cfg, rc_end_usage,          VPX_VBR, VPX_CQ);
  RANGE_CHECK_HI(cfg, rc_undershoot_pct,  1000);
  RANGE_CHECK_HI(cfg, rc_overshoot_pct,   1000);
  RANGE_CHECK_HI(cfg, rc_2pass_vbr_bias_pct, 100);
  RANGE_CHECK(cfg, kf_mode,               VPX_KF_DISABLED, VPX_KF_AUTO);
  // RANGE_CHECK_BOOL(cfg,                 g_delete_firstpassfile);
  RANGE_CHECK_BOOL(cfg,                   rc_resize_allowed);
  RANGE_CHECK_HI(cfg, rc_dropframe_thresh,   100);
  RANGE_CHECK_HI(cfg, rc_resize_up_thresh,   100);
  RANGE_CHECK_HI(cfg, rc_resize_down_thresh, 100);
  RANGE_CHECK(cfg,        g_pass,         VPX_RC_ONE_PASS, VPX_RC_LAST_PASS);

  /* VP8 does not support a lower bound on the keyframe interval in
   * automatic keyframe placement mode.
   */
  if (cfg->kf_mode != VPX_KF_DISABLED && cfg->kf_min_dist != cfg->kf_max_dist
      && cfg->kf_min_dist > 0)
    ERROR("kf_min_dist not supported in auto mode, use 0 "
          "or kf_max_dist instead.");

  RANGE_CHECK_BOOL(vp8_cfg,               enable_auto_alt_ref);
  RANGE_CHECK(vp8_cfg, cpu_used,           -16, 16);

  RANGE_CHECK_HI(vp8_cfg, noise_sensitivity,  6);

  RANGE_CHECK(vp8_cfg, token_partitions,   VP8_ONE_TOKENPARTITION, VP8_EIGHT_TOKENPARTITION);
  RANGE_CHECK_HI(vp8_cfg, Sharpness,       7);
  RANGE_CHECK(vp8_cfg, arnr_max_frames, 0, 15);
  RANGE_CHECK_HI(vp8_cfg, arnr_strength,   6);
  RANGE_CHECK(vp8_cfg, arnr_type,       1, 3);
  RANGE_CHECK(vp8_cfg, cq_level, 0, 63);

  if (cfg->g_pass == VPX_RC_LAST_PASS) {
    size_t           packet_sz = sizeof(FIRSTPASS_STATS);
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    int              n_packets = (int)(cfg->rc_twopass_stats_in.sz / packet_sz);
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    FIRSTPASS_STATS *stats;

    if (!cfg->rc_twopass_stats_in.buf)
      ERROR("rc_twopass_stats_in.buf not set.");

    if (cfg->rc_twopass_stats_in.sz % packet_sz)
      ERROR("rc_twopass_stats_in.sz indicates truncated packet.");

    if (cfg->rc_twopass_stats_in.sz < 2 * packet_sz)
      ERROR("rc_twopass_stats_in requires at least two packets.");

    stats = (void *)((char *)cfg->rc_twopass_stats_in.buf
                     + (n_packets - 1) * packet_sz);

    if ((int)(stats->count + 0.5) != n_packets - 1)
      ERROR("rc_twopass_stats_in missing EOS stats packet");
  }

  return VPX_CODEC_OK;
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}


static vpx_codec_err_t validate_img(vpx_codec_alg_priv_t *ctx,
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                                    const vpx_image_t    *img) {
  switch (img->fmt) {
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    case VPX_IMG_FMT_YV12:
    case VPX_IMG_FMT_I420:
    case VPX_IMG_FMT_VPXI420:
    case VPX_IMG_FMT_VPXYV12:
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      break;
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    default:
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      ERROR("Invalid image format. Only YV12 and I420 images are supported");
  }
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  if ((img->d_w != ctx->cfg.g_w) || (img->d_h != ctx->cfg.g_h))
    ERROR("Image size must match encoder init configuration size");
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  return VPX_CODEC_OK;
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}


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static vpx_codec_err_t set_vp8e_config(VP9_CONFIG *oxcf,
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                                       vpx_codec_enc_cfg_t cfg,
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                                       struct vp8_extracfg vp8_cfg) {
  oxcf->Version               = cfg.g_profile;
  oxcf->Version              |= vp8_cfg.experimental ? 0x4 : 0;
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  oxcf->Width                 = cfg.g_w;
  oxcf->Height                = cfg.g_h;
  /* guess a frame rate if out of whack, use 30 */
  oxcf->frame_rate             = (double)(cfg.g_timebase.den) / (double)(cfg.g_timebase.num);
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  if (oxcf->frame_rate > 180) {
    oxcf->frame_rate = 30;
  }
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  switch (cfg.g_pass) {
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    case VPX_RC_ONE_PASS:
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      oxcf->Mode = MODE_BESTQUALITY;
      break;
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    case VPX_RC_FIRST_PASS:
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      oxcf->Mode = MODE_FIRSTPASS;
      break;
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    case VPX_RC_LAST_PASS:
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      oxcf->Mode = MODE_SECONDPASS_BEST;
      break;
  }

  if (cfg.g_pass == VPX_RC_FIRST_PASS) {
    oxcf->allow_lag              = 0;
    oxcf->lag_in_frames           = 0;
  } else {
    oxcf->allow_lag              = (cfg.g_lag_in_frames) > 0;
    oxcf->lag_in_frames           = cfg.g_lag_in_frames;
  }

  // VBR only supported for now.
  // CBR code has been deprectated for experimental phase.
  // CQ mode not yet tested
  oxcf->end_usage          = USAGE_LOCAL_FILE_PLAYBACK;
  /*if (cfg.rc_end_usage == VPX_CQ)
      oxcf->end_usage      = USAGE_CONSTRAINED_QUALITY;
  else
      oxcf->end_usage      = USAGE_LOCAL_FILE_PLAYBACK;*/

  oxcf->target_bandwidth       = cfg.rc_target_bitrate;
  oxcf->rc_max_intra_bitrate_pct = vp8_cfg.rc_max_intra_bitrate_pct;

  oxcf->best_allowed_q          = cfg.rc_min_quantizer;
  oxcf->worst_allowed_q         = cfg.rc_max_quantizer;
  oxcf->cq_level                = vp8_cfg.cq_level;
  oxcf->fixed_q = -1;

  oxcf->under_shoot_pct         = cfg.rc_undershoot_pct;
  oxcf->over_shoot_pct          = cfg.rc_overshoot_pct;

  oxcf->maximum_buffer_size     = cfg.rc_buf_sz;
  oxcf->starting_buffer_level   = cfg.rc_buf_initial_sz;
  oxcf->optimal_buffer_level    = cfg.rc_buf_optimal_sz;

  oxcf->two_pass_vbrbias        = cfg.rc_2pass_vbr_bias_pct;
  oxcf->two_pass_vbrmin_section  = cfg.rc_2pass_vbr_minsection_pct;
  oxcf->two_pass_vbrmax_section  = cfg.rc_2pass_vbr_maxsection_pct;

  oxcf->auto_key               = cfg.kf_mode == VPX_KF_AUTO
                                 && cfg.kf_min_dist != cfg.kf_max_dist;
  // oxcf->kf_min_dist         = cfg.kf_min_dis;
  oxcf->key_freq               = cfg.kf_max_dist;

  // oxcf->delete_first_pass_file = cfg.g_delete_firstpassfile;
  // strcpy(oxcf->first_pass_file, cfg.g_firstpass_file);

  oxcf->cpu_used               =  vp8_cfg.cpu_used;
  oxcf->encode_breakout        =  vp8_cfg.static_thresh;
  oxcf->play_alternate         =  vp8_cfg.enable_auto_alt_ref;
  oxcf->noise_sensitivity      =  vp8_cfg.noise_sensitivity;
  oxcf->Sharpness             =  vp8_cfg.Sharpness;

  oxcf->two_pass_stats_in        =  cfg.rc_twopass_stats_in;
  oxcf->output_pkt_list         =  vp8_cfg.pkt_list;

  oxcf->arnr_max_frames = vp8_cfg.arnr_max_frames;
  oxcf->arnr_strength =  vp8_cfg.arnr_strength;
  oxcf->arnr_type =      vp8_cfg.arnr_type;

  oxcf->tuning = vp8_cfg.tuning;
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#if CONFIG_LOSSLESS
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  oxcf->lossless = vp8_cfg.lossless;
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#endif

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  /*
      printf("Current VP8 Settings: \n");
      printf("target_bandwidth: %d\n", oxcf->target_bandwidth);
      printf("noise_sensitivity: %d\n", oxcf->noise_sensitivity);
      printf("Sharpness: %d\n",    oxcf->Sharpness);
      printf("cpu_used: %d\n",  oxcf->cpu_used);
      printf("Mode: %d\n",     oxcf->Mode);
      printf("delete_first_pass_file: %d\n",  oxcf->delete_first_pass_file);
      printf("auto_key: %d\n",  oxcf->auto_key);
      printf("key_freq: %d\n", oxcf->key_freq);
      printf("end_usage: %d\n", oxcf->end_usage);
      printf("under_shoot_pct: %d\n", oxcf->under_shoot_pct);
      printf("over_shoot_pct: %d\n", oxcf->over_shoot_pct);
      printf("starting_buffer_level: %d\n", oxcf->starting_buffer_level);
      printf("optimal_buffer_level: %d\n",  oxcf->optimal_buffer_level);
      printf("maximum_buffer_size: %d\n", oxcf->maximum_buffer_size);
      printf("fixed_q: %d\n",  oxcf->fixed_q);
      printf("worst_allowed_q: %d\n", oxcf->worst_allowed_q);
      printf("best_allowed_q: %d\n", oxcf->best_allowed_q);
      printf("two_pass_vbrbias: %d\n",  oxcf->two_pass_vbrbias);
      printf("two_pass_vbrmin_section: %d\n", oxcf->two_pass_vbrmin_section);
      printf("two_pass_vbrmax_section: %d\n", oxcf->two_pass_vbrmax_section);
      printf("allow_lag: %d\n", oxcf->allow_lag);
      printf("lag_in_frames: %d\n", oxcf->lag_in_frames);
      printf("play_alternate: %d\n", oxcf->play_alternate);
      printf("Version: %d\n", oxcf->Version);
      printf("encode_breakout: %d\n", oxcf->encode_breakout);
  */
  return VPX_CODEC_OK;
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}

static vpx_codec_err_t vp8e_set_config(vpx_codec_alg_priv_t       *ctx,
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                                       const vpx_codec_enc_cfg_t  *cfg) {
  vpx_codec_err_t res;
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  if ((cfg->g_w != ctx->cfg.g_w) || (cfg->g_h != ctx->cfg.g_h))
    ERROR("Cannot change width or height after initialization");
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  /* Prevent increasing lag_in_frames. This check is stricter than it needs
   * to be -- the limit is not increasing past the first lag_in_frames
   * value, but we don't track the initial config, only the last successful
   * config.
   */
  if ((cfg->g_lag_in_frames > ctx->cfg.g_lag_in_frames))
    ERROR("Cannot increase lag_in_frames");
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  res = validate_config(ctx, cfg, &ctx->vp8_cfg);
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  if (!res) {
    ctx->cfg = *cfg;
    set_vp8e_config(&ctx->oxcf, ctx->cfg, ctx->vp8_cfg);
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    vp9_change_config(ctx->cpi, &ctx->oxcf);
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  }
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  return res;
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}


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int vp9_reverse_trans(int q);
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static vpx_codec_err_t get_param(vpx_codec_alg_priv_t *ctx,
                                 int                   ctrl_id,
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                                 va_list               args) {
  void *arg = va_arg(args, void *);
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#define MAP(id, var) case id: *(RECAST(id, arg)) = var; break

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  if (!arg)
    return VPX_CODEC_INVALID_PARAM;
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  switch (ctrl_id) {
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      MAP(VP8E_GET_LAST_QUANTIZER, vp9_get_quantizer(ctx->cpi));
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      MAP(VP8E_GET_LAST_QUANTIZER_64,
          vp9_reverse_trans(vp9_get_quantizer(ctx->cpi)));
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  }
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  return VPX_CODEC_OK;
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#undef MAP
}


static vpx_codec_err_t set_param(vpx_codec_alg_priv_t *ctx,
                                 int                   ctrl_id,
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                                 va_list               args) {
  vpx_codec_err_t     res  = VPX_CODEC_OK;
  struct vp8_extracfg xcfg = ctx->vp8_cfg;
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#define MAP(id, var) case id: var = CAST(id, args); break;

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  switch (ctrl_id) {
      MAP(VP8E_SET_CPUUSED,               xcfg.cpu_used);
      MAP(VP8E_SET_ENABLEAUTOALTREF,      xcfg.enable_auto_alt_ref);
      MAP(VP8E_SET_NOISE_SENSITIVITY,     xcfg.noise_sensitivity);
      MAP(VP8E_SET_SHARPNESS,             xcfg.Sharpness);
      MAP(VP8E_SET_STATIC_THRESHOLD,      xcfg.static_thresh);
      MAP(VP8E_SET_TOKEN_PARTITIONS,      xcfg.token_partitions);

      MAP(VP8E_SET_ARNR_MAXFRAMES,        xcfg.arnr_max_frames);
      MAP(VP8E_SET_ARNR_STRENGTH,        xcfg.arnr_strength);
      MAP(VP8E_SET_ARNR_TYPE,        xcfg.arnr_type);
      MAP(VP8E_SET_TUNING,                xcfg.tuning);
      MAP(VP8E_SET_CQ_LEVEL,              xcfg.cq_level);
      MAP(VP8E_SET_MAX_INTRA_BITRATE_PCT, xcfg.rc_max_intra_bitrate_pct);
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#if CONFIG_LOSSLESS
      MAP(VP9E_SET_LOSSLESS,              xcfg.lossless);
#endif
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  }

  res = validate_config(ctx, &ctx->cfg, &xcfg);

  if (!res) {
    ctx->vp8_cfg = xcfg;
    set_vp8e_config(&ctx->oxcf, ctx->cfg, ctx->vp8_cfg);
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    vp9_change_config(ctx->cpi, &ctx->oxcf);
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  }

  return res;
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#undef MAP
}
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static vpx_codec_err_t vp8e_common_init(vpx_codec_ctx_t *ctx,
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                                        int              experimental) {
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  vpx_codec_err_t            res = VPX_CODEC_OK;
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  struct vpx_codec_alg_priv *priv;
  vpx_codec_enc_cfg_t       *cfg;
  unsigned int               i;
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  VP9_PTR optr;
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  if (!ctx->priv) {
    priv = calloc(1, sizeof(struct vpx_codec_alg_priv));
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    if (!priv) {
      return VPX_CODEC_MEM_ERROR;
    }
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    ctx->priv = &priv->base;
    ctx->priv->sz = sizeof(*ctx->priv);
    ctx->priv->iface = ctx->iface;
    ctx->priv->alg_priv = priv;
    ctx->priv->init_flags = ctx->init_flags;
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    ctx->priv->enc.total_encoders = 1;
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    if (ctx->config.enc) {
      /* Update the reference to the config structure to an
       * internal copy.
       */
      ctx->priv->alg_priv->cfg = *ctx->config.enc;
      ctx->config.enc = &ctx->priv->alg_priv->cfg;
    }
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    cfg =  &ctx->priv->alg_priv->cfg;
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    /* Select the extra vp6 configuration table based on the current
     * usage value. If the current usage value isn't found, use the
     * values for usage case 0.
     */
    for (i = 0;
         extracfg_map[i].usage && extracfg_map[i].usage != cfg->g_usage;
         i++);
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    priv->vp8_cfg = extracfg_map[i].cfg;
    priv->vp8_cfg.pkt_list = &priv->pkt_list.head;
    priv->vp8_cfg.experimental = experimental;
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    priv->cx_data_sz = priv->cfg.g_w * priv->cfg.g_h * 3 / 2 * 2;
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    if (priv->cx_data_sz < 4096) priv->cx_data_sz = 4096;
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    priv->cx_data = malloc(priv->cx_data_sz);
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    if (!priv->cx_data) {
      return VPX_CODEC_MEM_ERROR;
    }
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    vp9_initialize_enc();
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    res = validate_config(priv, &priv->cfg, &priv->vp8_cfg);
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    if (!res) {
      set_vp8e_config(&ctx->priv->alg_priv->oxcf,
                      ctx->priv->alg_priv->cfg,
                      ctx->priv->alg_priv->vp8_cfg);
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      optr = vp9_create_compressor(&ctx->priv->alg_priv->oxcf);
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      if (!optr)
        res = VPX_CODEC_MEM_ERROR;
      else
        ctx->priv->alg_priv->cpi = optr;
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    }
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  }
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  return res;
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}

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static vpx_codec_err_t vp8e_init(vpx_codec_ctx_t *ctx,
                                 vpx_codec_priv_enc_mr_cfg_t *data) {
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  return vp8e_common_init(ctx, 0);
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}


#if CONFIG_EXPERIMENTAL
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static vpx_codec_err_t vp8e_exp_init(vpx_codec_ctx_t *ctx,
                                     vpx_codec_priv_enc_mr_cfg_t *data) {
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  return vp8e_common_init(ctx, 1);
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}
#endif


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static vpx_codec_err_t vp8e_destroy(vpx_codec_alg_priv_t *ctx) {
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  free(ctx->cx_data);
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  vp9_remove_compressor(&ctx->cpi);
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  free(ctx);
  return VPX_CODEC_OK;
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}

static vpx_codec_err_t image2yuvconfig(const vpx_image_t   *img,
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                                       YV12_BUFFER_CONFIG  *yv12) {
  vpx_codec_err_t        res = VPX_CODEC_OK;
  yv12->y_buffer = img->planes[VPX_PLANE_Y];
  yv12->u_buffer = img->planes[VPX_PLANE_U];
  yv12->v_buffer = img->planes[VPX_PLANE_V];

  yv12->y_width  = img->d_w;
  yv12->y_height = img->d_h;
  yv12->uv_width = (1 + yv12->y_width) / 2;
  yv12->uv_height = (1 + yv12->y_height) / 2;

  yv12->y_stride = img->stride[VPX_PLANE_Y];
  yv12->uv_stride = img->stride[VPX_PLANE_U];

  yv12->border  = (img->stride[VPX_PLANE_Y] - img->w) / 2;
  yv12->clrtype = (img->fmt == VPX_IMG_FMT_VPXI420 || img->fmt == VPX_IMG_FMT_VPXYV12); // REG_YUV = 0
  return res;
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}

static void pick_quickcompress_mode(vpx_codec_alg_priv_t  *ctx,
                                    unsigned long          duration,
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                                    unsigned long          deadline) {
  unsigned int new_qc;

  /* Use best quality mode if no deadline is given. */
  if (deadline)
    new_qc = MODE_GOODQUALITY;
  else
    new_qc = MODE_BESTQUALITY;

  if (ctx->cfg.g_pass == VPX_RC_FIRST_PASS)
    new_qc = MODE_FIRSTPASS;
  else if (ctx->cfg.g_pass == VPX_RC_LAST_PASS)
    new_qc = (new_qc == MODE_BESTQUALITY)
             ? MODE_SECONDPASS_BEST
             : MODE_SECONDPASS;

  if (ctx->oxcf.Mode != new_qc) {
    ctx->oxcf.Mode = new_qc;
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    vp9_change_config(ctx->cpi, &ctx->oxcf);
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  }
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}

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static void append_length(unsigned char* cx_data, unsigned long int *cx_size) {
  unsigned char chunk;
  unsigned int offset = 0;
  unsigned long int size = *cx_size;
  do {
    chunk = size & 0x7F;
    size >>= 7;
    chunk |= (offset == 0) << 7;
    cx_data[offset] = chunk;
    offset++;
  } while (size);
  *cx_size += offset;
}
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static vpx_codec_err_t vp8e_encode(vpx_codec_alg_priv_t  *ctx,
                                   const vpx_image_t     *img,
                                   vpx_codec_pts_t        pts,
                                   unsigned long          duration,
                                   vpx_enc_frame_flags_t  flags,
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                                   unsigned long          deadline) {
  vpx_codec_err_t res = VPX_CODEC_OK;
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  if (img)
    res = validate_img(ctx, img);
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  pick_quickcompress_mode(ctx, duration, deadline);
  vpx_codec_pkt_list_init(&ctx->pkt_list);
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  /* Handle Flags */
  if (((flags & VP8_EFLAG_NO_UPD_GF) && (flags & VP8_EFLAG_FORCE_GF))
      || ((flags & VP8_EFLAG_NO_UPD_ARF) && (flags & VP8_EFLAG_FORCE_ARF))) {
    ctx->base.err_detail = "Conflicting flags.";
    return VPX_CODEC_INVALID_PARAM;
  }
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  if (flags & (VP8_EFLAG_NO_REF_LAST | VP8_EFLAG_NO_REF_GF
               | VP8_EFLAG_NO_REF_ARF)) {
    int ref = 7;
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    if (flags & VP8_EFLAG_NO_REF_LAST)
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      ref ^= VP9_LAST_FLAG;
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    if (flags & VP8_EFLAG_NO_REF_GF)
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      ref ^= VP9_GOLD_FLAG;
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    if (flags & VP8_EFLAG_NO_REF_ARF)
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      ref ^= VP9_ALT_FLAG;
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    vp9_use_as_reference(ctx->cpi, ref);
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  }
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  if (flags & (VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF
               | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_FORCE_GF
               | VP8_EFLAG_FORCE_ARF)) {
    int upd = 7;
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    if (flags & VP8_EFLAG_NO_UPD_LAST)
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      upd ^= VP9_LAST_FLAG;
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    if (flags & VP8_EFLAG_NO_UPD_GF)
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      upd ^= VP9_GOLD_FLAG;
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    if (flags & VP8_EFLAG_NO_UPD_ARF)
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      upd ^= VP9_ALT_FLAG;
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    vp9_update_reference(ctx->cpi, upd);
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  }
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  if (flags & VP8_EFLAG_NO_UPD_ENTROPY) {
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    vp9_update_entropy(ctx->cpi, 0);
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  }
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  /* Handle fixed keyframe intervals */
  if (ctx->cfg.kf_mode == VPX_KF_AUTO
      && ctx->cfg.kf_min_dist == ctx->cfg.kf_max_dist) {
    if (++ctx->fixed_kf_cntr > ctx->cfg.kf_min_dist) {
      flags |= VPX_EFLAG_FORCE_KF;
      ctx->fixed_kf_cntr = 1;
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    }
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  }
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  /* Initialize the encoder instance on the first frame*/
  if (!res && ctx->cpi) {
    unsigned int lib_flags;
    YV12_BUFFER_CONFIG sd;
    int64_t dst_time_stamp, dst_end_time_stamp;
    unsigned long size, cx_data_sz;
    unsigned char *cx_data;
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    /* Set up internal flags */
    if (ctx->base.init_flags & VPX_CODEC_USE_PSNR)
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      ((VP9_COMP *)ctx->cpi)->b_calculate_psnr = 1;
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    // if (ctx->base.init_flags & VPX_CODEC_USE_OUTPUT_PARTITION)
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    //    ((VP9_COMP *)ctx->cpi)->output_partition = 1;
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    /* Convert API flags to internal codec lib flags */
    lib_flags = (flags & VPX_EFLAG_FORCE_KF) ? FRAMEFLAGS_KEY : 0;
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    /* vp8 use 10,000,000 ticks/second as time stamp */
    dst_time_stamp    = pts * 10000000 * ctx->cfg.g_timebase.num / ctx->cfg.g_timebase.den;
    dst_end_time_stamp = (pts + duration) * 10000000 * ctx->cfg.g_timebase.num / ctx->cfg.g_timebase.den;
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    if (img != NULL) {
      res = image2yuvconfig(img, &sd);
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      if (vp9_receive_raw_frame(ctx->cpi, ctx->next_frame_flag | lib_flags,
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                                &sd, dst_time_stamp, dst_end_time_stamp)) {
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        VP9_COMP *cpi = (VP9_COMP *)ctx->cpi;
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        res = update_error_state(ctx, &cpi->common.error);
      }

      /* reset for next frame */
      ctx->next_frame_flag = 0;
    }
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    lib_flags = 0;

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    if (ctx->altref_size) {
      cx_data = ctx->altref_cx_data + ctx->altref_size;
      cx_data_sz = ctx->cx_data_sz - ctx->altref_size;
    } else {
      cx_data = ctx->cx_data;
      cx_data_sz = ctx->cx_data_sz;
    }

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    while (cx_data_sz >= ctx->cx_data_sz / 2 &&
           -1 != vp9_get_compressed_data(ctx->cpi, &lib_flags, &size,
                                         cx_data, &dst_time_stamp,
                                         &dst_end_time_stamp, !img)) {
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      if (size) {
        vpx_codec_pts_t    round, delta;
        vpx_codec_cx_pkt_t pkt;
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        VP9_COMP *cpi = (VP9_COMP *)ctx->cpi;
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        /* TODO(jkoleszar): for now we append lengths to all frames, revisit
         * this later to ensure if this is necessary */
        append_length(cx_data + size, &size);

        if (!cpi->common.show_frame) {
          ctx->altref_cx_data = cx_data;
          ctx->altref_size = size;
          cx_data += size;
          cx_data_sz -= size;
          continue;
        }

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        /* Add the frame packet to the list of returned packets. */
        round = 1000000 * ctx->cfg.g_timebase.num / 2 - 1;
        delta = (dst_end_time_stamp - dst_time_stamp);
        pkt.kind = VPX_CODEC_CX_FRAME_PKT;
        pkt.data.frame.pts =
          (dst_time_stamp * ctx->cfg.g_timebase.den + round)
          / ctx->cfg.g_timebase.num / 10000000;
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        pkt.data.frame.duration = (unsigned long)
          ((delta * ctx->cfg.g_timebase.den + round)
          / ctx->cfg.g_timebase.num / 10000000);
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        pkt.data.frame.flags = lib_flags << 16;

        if (lib_flags & FRAMEFLAGS_KEY)
          pkt.data.frame.flags |= VPX_FRAME_IS_KEY;

        if (!cpi->common.show_frame) {
          pkt.data.frame.flags |= VPX_FRAME_IS_INVISIBLE;

          // This timestamp should be as close as possible to the
          // prior PTS so that if a decoder uses pts to schedule when
          // to do this, we start right after last frame was decoded.
          // Invisible frames have no duration.
          pkt.data.frame.pts = ((cpi->last_time_stamp_seen
                                 * ctx->cfg.g_timebase.den + round)
                                / ctx->cfg.g_timebase.num / 10000000) + 1;
          pkt.data.frame.duration = 0;
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        }

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        if (cpi->droppable)
          pkt.data.frame.flags |= VPX_FRAME_IS_DROPPABLE;
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        /*if (cpi->output_partition)
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        {
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            int i;
            const int num_partitions = 1;

            pkt.data.frame.flags |= VPX_FRAME_IS_FRAGMENT;

            for (i = 0; i < num_partitions; ++i)
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            {
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                pkt.data.frame.buf = cx_data;
                pkt.data.frame.sz = cpi->partition_sz[i];
                pkt.data.frame.partition_id = i;
                // don't set the fragment bit for the last partition
                if (i == (num_partitions - 1))
                    pkt.data.frame.flags &= ~VPX_FRAME_IS_FRAGMENT;
                vpx_codec_pkt_list_add(&ctx->pkt_list.head, &pkt);
                cx_data += cpi->partition_sz[i];
                cx_data_sz -= cpi->partition_sz[i];
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            }
        }
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        else*/
        {
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          if (ctx->altref_size) {
            pkt.data.frame.sz = ctx->altref_size + size;
            pkt.data.frame.buf = ctx->altref_cx_data;
            ctx->altref_size = 0;
            ctx->altref_cx_data = NULL;
          } else {
            pkt.data.frame.buf = cx_data;
            pkt.data.frame.sz = size;
          }
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          pkt.data.frame.partition_id = -1;
          vpx_codec_pkt_list_add(&ctx->pkt_list.head, &pkt);
          cx_data += size;
          cx_data_sz -= size;
        }

        // printf("timestamp: %lld, duration: %d\n", pkt->data.frame.pts, pkt->data.frame.duration);
      }
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    }
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  }
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  return res;
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}


static const vpx_codec_cx_pkt_t *vp8e_get_cxdata(vpx_codec_alg_priv_t  *ctx,
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                                                 vpx_codec_iter_t      *iter) {
  return vpx_codec_pkt_list_get(&ctx->pkt_list.head, iter);
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}

static vpx_codec_err_t vp8e_set_reference(vpx_codec_alg_priv_t *ctx,
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                                          int ctr_id,
                                          va_list args) {
  vpx_ref_frame_t *data = va_arg(args, vpx_ref_frame_t *);
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  if (data) {
    vpx_ref_frame_t *frame = (vpx_ref_frame_t *)data;
    YV12_BUFFER_CONFIG sd;
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    image2yuvconfig(&frame->img, &sd);
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    vp9_set_reference_enc(ctx->cpi, frame->frame_type, &sd);
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    return VPX_CODEC_OK;
  } else
    return VPX_CODEC_INVALID_PARAM;
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}

static vpx_codec_err_t vp8e_get_reference(vpx_codec_alg_priv_t *ctx,
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                                          int ctr_id,
                                          va_list args) {
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  vpx_ref_frame_t *data = va_arg(args, vpx_ref_frame_t *);
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  if (data) {
    vpx_ref_frame_t *frame = (vpx_ref_frame_t *)data;
    YV12_BUFFER_CONFIG sd;
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    image2yuvconfig(&frame->img, &sd);
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    vp9_get_reference_enc(ctx->cpi, frame->frame_type, &sd);
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    return VPX_CODEC_OK;
  } else
    return VPX_CODEC_INVALID_PARAM;
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}

static vpx_codec_err_t vp8e_set_previewpp(vpx_codec_alg_priv_t *ctx,
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                                          int ctr_id,
                                          va_list args) {
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#if CONFIG_POSTPROC
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  vp8_postproc_cfg_t *data = va_arg(args, vp8_postproc_cfg_t *);
  (void)ctr_id;
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  if (data) {
    ctx->preview_ppcfg = *((vp8_postproc_cfg_t *)data);
    return VPX_CODEC_OK;
  } else
    return VPX_CODEC_INVALID_PARAM;
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#else
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  (void)ctx;
  (void)ctr_id;
  (void)args;
  return VPX_CODEC_INCAPABLE;
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#endif
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}


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static vpx_image_t *vp8e_get_preview(vpx_codec_alg_priv_t *ctx) {
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  YV12_BUFFER_CONFIG sd;
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  vp9_ppflags_t flags = {0};
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  if (ctx->preview_ppcfg.post_proc_flag) {
    flags.post_proc_flag        = ctx->preview_ppcfg.post_proc_flag;
    flags.deblocking_level      = ctx->preview_ppcfg.deblocking_level;
    flags.noise_level           = ctx->preview_ppcfg.noise_level;
  }
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  if (0 == vp9_get_preview_raw_frame(ctx->cpi, &sd, &flags)) {
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    /*
    vpx_img_wrap(&ctx->preview_img, VPX_IMG_FMT_YV12,
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        sd.y_width + 2*VP9BORDERINPIXELS,
        sd.y_height + 2*VP9BORDERINPIXELS,
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        1,
        sd.buffer_alloc);
    vpx_img_set_rect(&ctx->preview_img,
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        VP9BORDERINPIXELS, VP9BORDERINPIXELS,
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        sd.y_width, sd.y_height);
        */

    ctx->preview_img.bps = 12;
    ctx->preview_img.planes[VPX_PLANE_Y] = sd.y_buffer;
    ctx->preview_img.planes[VPX_PLANE_U] = sd.u_buffer;
    ctx->preview_img.planes[VPX_PLANE_V] = sd.v_buffer;

    if (sd.clrtype == REG_YUV)
      ctx->preview_img.fmt = VPX_IMG_FMT_I420;
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    else
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      ctx->preview_img.fmt = VPX_IMG_FMT_VPXI420;

    ctx->preview_img.x_chroma_shift = 1;
    ctx->preview_img.y_chroma_shift = 1;

    ctx->preview_img.d_w = sd.y_width;
    ctx->preview_img.d_h = sd.y_height;
    ctx->preview_img.stride[VPX_PLANE_Y] = sd.y_stride;
    ctx->preview_img.stride[VPX_PLANE_U] = sd.uv_stride;
    ctx->preview_img.stride[VPX_PLANE_V] = sd.uv_stride;
    ctx->preview_img.w   = sd.y_width;
    ctx->preview_img.h   = sd.y_height;

    return &ctx->preview_img;
  } else
    return NULL;
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}

static vpx_codec_err_t vp8e_update_entropy(vpx_codec_alg_priv_t *ctx,
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                                           int ctr_id,
                                           va_list args) {
  int update = va_arg(args, int);
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  vp9_update_entropy(ctx->cpi, update);
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  return VPX_CODEC_OK;
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}

static vpx_codec_err_t vp8e_update_reference(vpx_codec_alg_priv_t *ctx,
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                                             int ctr_id,
                                             va_list args) {
  int update = va_arg(args, int);
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  vp9_update_reference(ctx->cpi, update);
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  return VPX_CODEC_OK;
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}

static vpx_codec_err_t vp8e_use_reference(vpx_codec_alg_priv_t *ctx,
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                                          int ctr_id,
                                          va_list args) {
  int reference_flag = va_arg(args, int);
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  vp9_use_as_reference(ctx->cpi, reference_flag);
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  return VPX_CODEC_OK;
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}

static vpx_codec_err_t vp8e_set_roi_map(vpx_codec_alg_priv_t *ctx,
                                        int ctr_id,
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                                        va_list args) {
  vpx_roi_map_t *data = va_arg(args, vpx_roi_map_t *);
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  if (data) {
    vpx_roi_map_t *roi = (vpx_roi_map_t *)data;
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    if (!vp9_set_roimap(ctx->cpi, roi->roi_map, roi->rows, roi->cols,
                        roi->delta_q, roi->delta_lf, roi->static_threshold))
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      return VPX_CODEC_OK;
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    else
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      return VPX_CODEC_INVALID_PARAM;
  } else
    return VPX_CODEC_INVALID_PARAM;
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}


static vpx_codec_err_t vp8e_set_activemap(vpx_codec_alg_priv_t *ctx,
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                                          int ctr_id,
                                          va_list args) {
  vpx_active_map_t *data = va_arg(args, vpx_active_map_t *);
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  if (data) {
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    vpx_active_map_t *map = (vpx_active_map_t *)data;
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    if (!vp9_set_active_map(ctx->cpi, map->active_map, map->rows, map->cols))
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      return VPX_CODEC_OK;
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    else
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      return VPX_CODEC_INVALID_PARAM;
  } else
    return VPX_CODEC_INVALID_PARAM;
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}

static vpx_codec_err_t vp8e_set_scalemode(vpx_codec_alg_priv_t *ctx,
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                                          int ctr_id,
                                          va_list args) {

  vpx_scaling_mode_t *data =  va_arg(args, vpx_scaling_mode_t *);

  if (data) {
    int res;
    vpx_scaling_mode_t scalemode = *(vpx_scaling_mode_t *)data;
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    res = vp9_set_internal_size(ctx->cpi, scalemode.h_scaling_mode,
                                scalemode.v_scaling_mode);
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    if (!res) {
      /*force next frame a key frame to effect scaling mode */
      ctx->next_frame_flag |= FRAMEFLAGS_KEY;
      return VPX_CODEC_OK;
    } else
      return VPX_CODEC_INVALID_PARAM;
  } else
    return VPX_CODEC_INVALID_PARAM;
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}


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static vpx_codec_ctrl_fn_map_t vp8e_ctf_maps[] = {
  {VP8_SET_REFERENCE,                 vp8e_set_reference},
  {VP8_COPY_REFERENCE,                vp8e_get_reference},
  {VP8_SET_POSTPROC,                  vp8e_set_previewpp},
  {VP8E_UPD_ENTROPY,                  vp8e_update_entropy},
  {VP8E_UPD_REFERENCE,                vp8e_update_reference},
  {VP8E_USE_REFERENCE,                vp8e_use_reference},
  {VP8E_SET_ROI_MAP,                  vp8e_set_roi_map},
  {VP8E_SET_ACTIVEMAP,                vp8e_set_activemap},
  {VP8E_SET_SCALEMODE,                vp8e_set_scalemode},
  {VP8E_SET_CPUUSED,                  set_param},
  {VP8E_SET_NOISE_SENSITIVITY,        set_param},
  {VP8E_SET_ENABLEAUTOALTREF,         set_param},
  {VP8E_SET_SHARPNESS,                set_param},
  {VP8E_SET_STATIC_THRESHOLD,         set_param},
  {VP8E_SET_TOKEN_PARTITIONS,         set_param},
  {VP8E_GET_LAST_QUANTIZER,           get_param},
  {VP8E_GET_LAST_QUANTIZER_64,        get_param},
  {VP8E_SET_ARNR_MAXFRAMES,           set_param},
  {VP8E_SET_ARNR_STRENGTH,           set_param},
  {VP8E_SET_ARNR_TYPE,           set_param},
  {VP8E_SET_TUNING,                   set_param},
  {VP8E_SET_CQ_LEVEL,                 set_param},
  {VP8E_SET_MAX_INTRA_BITRATE_PCT,    set_param},
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#if CONFIG_LOSSLESS
  {VP9E_SET_LOSSLESS,                 set_param},
#endif
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  { -1, NULL},
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};

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static vpx_codec_enc_cfg_map_t vp8e_usage_cfg_map[] = {
  {
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    0,
    {
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      0,                  /* g_usage */
      0,                  /* g_threads */
      0,                  /* g_profile */
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      320,                /* g_width */
      240,                /* g_height */
      {1, 30},            /* g_timebase */
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      0,                  /* g_error_resilient */
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      VPX_RC_ONE_PASS,    /* g_pass */
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      0,                  /* g_lag_in_frames */
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      0,                  /* rc_dropframe_thresh */
      0,                  /* rc_resize_allowed */
      60,                 /* rc_resize_down_thresold */
      30,                 /* rc_resize_up_thresold */
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      VPX_VBR,            /* rc_end_usage */