xswitch/libs/libvpx/vp8/vp8_cx_iface.c

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

#include "./vpx_config.h"
#include "./vp8_rtcd.h"
#include "./vpx_dsp_rtcd.h"
#include "./vpx_scale_rtcd.h"
#include "vpx/vpx_codec.h"
#include "vpx/internal/vpx_codec_internal.h"
#include "vpx_version.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/system_state.h"
#include "vpx_ports/vpx_once.h"
#include "vpx_util/vpx_timestamp.h"
#include "vp8/encoder/onyx_int.h"
#include "vpx/vp8cx.h"
#include "vp8/encoder/firstpass.h"
#include "vp8/common/onyx.h"
#include "vp8/common/common.h"
#include <stdlib.h>
#include <string.h>

struct vp8_extracfg {
  struct vpx_codec_pkt_list *pkt_list;
  int cpu_used; /** available cpu percentage in 1/16*/
  /** if encoder decides to uses alternate reference frame */
  unsigned int enable_auto_alt_ref;
  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 */
  vp8e_tuning tuning;
  unsigned int cq_level; /* constrained quality level */
  unsigned int rc_max_intra_bitrate_pct;
  unsigned int gf_cbr_boost_pct;
  unsigned int screen_content_mode;
};

static struct vp8_extracfg default_extracfg = {
  NULL,
#if !(CONFIG_REALTIME_ONLY)
  0, /* cpu_used      */
#else
  4,                      /* cpu_used      */
#endif
  0, /* enable_auto_alt_ref */
  0, /* noise_sensitivity */
  0, /* Sharpness */
  0, /* static_thresh */
#if (CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING)
  VP8_EIGHT_TOKENPARTITION,
#else
  VP8_ONE_TOKENPARTITION, /* token_partitions */
#endif
  0,  /* arnr_max_frames */
  3,  /* arnr_strength */
  3,  /* arnr_type*/
  0,  /* tuning*/
  10, /* cq_level */
  0,  /* rc_max_intra_bitrate_pct */
  0,  /* gf_cbr_boost_pct */
  0,  /* screen_content_mode */
};

struct vpx_codec_alg_priv {
  vpx_codec_priv_t base;
  vpx_codec_enc_cfg_t cfg;
  struct vp8_extracfg vp8_cfg;
  vpx_rational64_t timestamp_ratio;
  vpx_codec_pts_t pts_offset;
  unsigned char pts_offset_initialized;
  VP8_CONFIG oxcf;
  struct VP8_COMP *cpi;
  unsigned char *cx_data;
  unsigned int cx_data_sz;
  vpx_image_t preview_img;
  unsigned int next_frame_flag;
  vp8_postproc_cfg_t preview_ppcfg;
  /* pkt_list size depends on the maximum number of lagged frames allowed. */
  vpx_codec_pkt_list_decl(64) pkt_list;
  unsigned int fixed_kf_cntr;
  vpx_enc_frame_flags_t control_frame_flags;
};

static vpx_codec_err_t update_error_state(
    vpx_codec_alg_priv_t *ctx, const struct vpx_internal_error_info *error) {
  vpx_codec_err_t res;

  if ((res = error->error_code)) {
    ctx->base.err_detail = error->has_detail ? error->detail : NULL;
  }

  return res;
}

#undef ERROR
#define ERROR(str)                  \
  do {                              \
    ctx->base.err_detail = str;     \
    return VPX_CODEC_INVALID_PARAM; \
  } while (0)

#define RANGE_CHECK(p, memb, lo, hi)                                     \
  do {                                                                   \
    if (!(((p)->memb == (lo) || (p)->memb > (lo)) && (p)->memb <= (hi))) \
      ERROR(#memb " out of range [" #lo ".." #hi "]");                   \
  } while (0)

#define RANGE_CHECK_HI(p, memb, hi)                                     \
  do {                                                                  \
    if (!((p)->memb <= (hi))) ERROR(#memb " out of range [.." #hi "]"); \
  } while (0)

#define RANGE_CHECK_LO(p, memb, lo)                                     \
  do {                                                                  \
    if (!((p)->memb >= (lo))) ERROR(#memb " out of range [" #lo "..]"); \
  } while (0)

#define RANGE_CHECK_BOOL(p, memb)                                     \
  do {                                                                \
    if (!!((p)->memb) != (p)->memb) ERROR(#memb " expected boolean"); \
  } while (0)

#if defined(_MSC_VER)
#define COMPILE_TIME_ASSERT(boolexp)              \
  do {                                            \
    char compile_time_assert[(boolexp) ? 1 : -1]; \
    (void)compile_time_assert;                    \
  } while (0)
#else /* !_MSC_VER */
#define COMPILE_TIME_ASSERT(boolexp)                         \
  do {                                                       \
    struct {                                                 \
      unsigned int compile_time_assert : (boolexp) ? 1 : -1; \
    } compile_time_assert;                                   \
    (void)compile_time_assert;                               \
  } while (0)
#endif /* _MSC_VER */

static vpx_codec_err_t validate_config(vpx_codec_alg_priv_t *ctx,
                                       const vpx_codec_enc_cfg_t *cfg,
                                       const struct vp8_extracfg *vp8_cfg,
                                       int finalize) {
  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, 1000000000);
  RANGE_CHECK_HI(cfg, g_profile, 3);
  RANGE_CHECK_HI(cfg, rc_max_quantizer, 63);
  RANGE_CHECK_HI(cfg, rc_min_quantizer, cfg->rc_max_quantizer);
  RANGE_CHECK_HI(cfg, g_threads, 64);
#if CONFIG_REALTIME_ONLY
  RANGE_CHECK_HI(cfg, g_lag_in_frames, 0);
#elif CONFIG_MULTI_RES_ENCODING
  if (ctx->base.enc.total_encoders > 1) RANGE_CHECK_HI(cfg, g_lag_in_frames, 0);
#else
  RANGE_CHECK_HI(cfg, g_lag_in_frames, 25);
#endif
  RANGE_CHECK(cfg, rc_end_usage, VPX_VBR, VPX_Q);
  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);

/* TODO: add spatial re-sampling support and frame dropping in
 * multi-res-encoder.*/
#if CONFIG_MULTI_RES_ENCODING
  if (ctx->base.enc.total_encoders > 1)
    RANGE_CHECK_HI(cfg, rc_resize_allowed, 0);
#else
  RANGE_CHECK_BOOL(cfg, rc_resize_allowed);
#endif
  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);

#if CONFIG_REALTIME_ONLY
  RANGE_CHECK(cfg, g_pass, VPX_RC_ONE_PASS, VPX_RC_ONE_PASS);
#elif CONFIG_MULTI_RES_ENCODING
  if (ctx->base.enc.total_encoders > 1)
    RANGE_CHECK(cfg, g_pass, VPX_RC_ONE_PASS, VPX_RC_ONE_PASS);
#else
  RANGE_CHECK(cfg, g_pass, VPX_RC_ONE_PASS, VPX_RC_LAST_PASS);
#endif

  /* 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);

#if CONFIG_REALTIME_ONLY && !CONFIG_TEMPORAL_DENOISING
  RANGE_CHECK(vp8_cfg, noise_sensitivity, 0, 0);
#else
  RANGE_CHECK_HI(vp8_cfg, noise_sensitivity, 6);
#endif

  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);
  RANGE_CHECK_HI(vp8_cfg, screen_content_mode, 2);
  if (finalize && (cfg->rc_end_usage == VPX_CQ || cfg->rc_end_usage == VPX_Q))
    RANGE_CHECK(vp8_cfg, cq_level, cfg->rc_min_quantizer,
                cfg->rc_max_quantizer);

#if !(CONFIG_REALTIME_ONLY)
  if (cfg->g_pass == VPX_RC_LAST_PASS) {
    size_t packet_sz = sizeof(FIRSTPASS_STATS);
    int n_packets = (int)(cfg->rc_twopass_stats_in.sz / packet_sz);
    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");
  }
#endif

  RANGE_CHECK(cfg, ts_number_layers, 1, 5);

  if (cfg->ts_number_layers > 1) {
    unsigned int i;
    RANGE_CHECK_HI(cfg, ts_periodicity, 16);

    for (i = 1; i < cfg->ts_number_layers; ++i) {
      if (cfg->ts_target_bitrate[i] <= cfg->ts_target_bitrate[i - 1] &&
          cfg->rc_target_bitrate > 0)
        ERROR("ts_target_bitrate entries are not strictly increasing");
    }

    RANGE_CHECK(cfg, ts_rate_decimator[cfg->ts_number_layers - 1], 1, 1);
    for (i = cfg->ts_number_layers - 2; i > 0; i--) {
      if (cfg->ts_rate_decimator[i - 1] != 2 * cfg->ts_rate_decimator[i])
        ERROR("ts_rate_decimator factors are not powers of 2");
    }

    RANGE_CHECK_HI(cfg, ts_layer_id[i], cfg->ts_number_layers - 1);
  }

#if (CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING)
  if (cfg->g_threads > (1 << vp8_cfg->token_partitions))
    ERROR("g_threads cannot be bigger than number of token partitions");
#endif

  return VPX_CODEC_OK;
}

static vpx_codec_err_t validate_img(vpx_codec_alg_priv_t *ctx,
                                    const vpx_image_t *img) {
  switch (img->fmt) {
    case VPX_IMG_FMT_YV12:
    case VPX_IMG_FMT_I420:
    case VPX_IMG_FMT_VPXI420:
    case VPX_IMG_FMT_VPXYV12: break;
    default:
      ERROR("Invalid image format. Only YV12 and I420 images are supported");
  }

  if ((img->d_w != ctx->cfg.g_w) || (img->d_h != ctx->cfg.g_h))
    ERROR("Image size must match encoder init configuration size");

  return VPX_CODEC_OK;
}

static vpx_codec_err_t set_vp8e_config(VP8_CONFIG *oxcf,
                                       vpx_codec_enc_cfg_t cfg,
                                       struct vp8_extracfg vp8_cfg,
                                       vpx_codec_priv_enc_mr_cfg_t *mr_cfg) {
  oxcf->multi_threaded = cfg.g_threads;
  oxcf->Version = cfg.g_profile;

  oxcf->Width = cfg.g_w;
  oxcf->Height = cfg.g_h;
  oxcf->timebase = cfg.g_timebase;

  oxcf->error_resilient_mode = cfg.g_error_resilient;

  switch (cfg.g_pass) {
    case VPX_RC_ONE_PASS: oxcf->Mode = MODE_BESTQUALITY; break;
    case VPX_RC_FIRST_PASS: oxcf->Mode = MODE_FIRSTPASS; break;
    case VPX_RC_LAST_PASS: oxcf->Mode = MODE_SECONDPASS_BEST; break;
  }

  if (cfg.g_pass == VPX_RC_FIRST_PASS || cfg.g_pass == VPX_RC_ONE_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;
  }

  oxcf->allow_df = (cfg.rc_dropframe_thresh > 0);
  oxcf->drop_frames_water_mark = cfg.rc_dropframe_thresh;

  oxcf->allow_spatial_resampling = cfg.rc_resize_allowed;
  oxcf->resample_up_water_mark = cfg.rc_resize_up_thresh;
  oxcf->resample_down_water_mark = cfg.rc_resize_down_thresh;

  if (cfg.rc_end_usage == VPX_VBR) {
    oxcf->end_usage = USAGE_LOCAL_FILE_PLAYBACK;
  } else if (cfg.rc_end_usage == VPX_CBR) {
    oxcf->end_usage = USAGE_STREAM_FROM_SERVER;
  } else if (cfg.rc_end_usage == VPX_CQ) {
    oxcf->end_usage = USAGE_CONSTRAINED_QUALITY;
  } else if (cfg.rc_end_usage == VPX_Q) {
    oxcf->end_usage = USAGE_CONSTANT_QUALITY;
  }

  oxcf->target_bandwidth = cfg.rc_target_bitrate;
  oxcf->rc_max_intra_bitrate_pct = vp8_cfg.rc_max_intra_bitrate_pct;
  oxcf->gf_cbr_boost_pct = vp8_cfg.gf_cbr_boost_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_in_ms = cfg.rc_buf_sz;
  oxcf->starting_buffer_level_in_ms = cfg.rc_buf_initial_sz;
  oxcf->optimal_buffer_level_in_ms = cfg.rc_buf_optimal_sz;

  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->key_freq = cfg.kf_max_dist;

  oxcf->number_of_layers = cfg.ts_number_layers;
  oxcf->periodicity = cfg.ts_periodicity;

  if (oxcf->number_of_layers > 1) {
    memcpy(oxcf->target_bitrate, cfg.ts_target_bitrate,
           sizeof(cfg.ts_target_bitrate));
    memcpy(oxcf->rate_decimator, cfg.ts_rate_decimator,
           sizeof(cfg.ts_rate_decimator));
    memcpy(oxcf->layer_id, cfg.ts_layer_id, sizeof(cfg.ts_layer_id));
  }

#if CONFIG_MULTI_RES_ENCODING
  /* When mr_cfg is NULL, oxcf->mr_total_resolutions and oxcf->mr_encoder_id
   * are both memset to 0, which ensures the correct logic under this
   * situation.
   */
  if (mr_cfg) {
    oxcf->mr_total_resolutions = mr_cfg->mr_total_resolutions;
    oxcf->mr_encoder_id = mr_cfg->mr_encoder_id;
    oxcf->mr_down_sampling_factor.num = mr_cfg->mr_down_sampling_factor.num;
    oxcf->mr_down_sampling_factor.den = mr_cfg->mr_down_sampling_factor.den;
    oxcf->mr_low_res_mode_info = mr_cfg->mr_low_res_mode_info;
  }
#else
  (void)mr_cfg;
#endif

  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->token_partitions = vp8_cfg.token_partitions;

  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;

  oxcf->screen_content_mode = vp8_cfg.screen_content_mode;

  /*
      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("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("allow_spatial_resampling: %d\n",  oxcf->allow_spatial_resampling);
      printf("resample_down_water_mark: %d\n", oxcf->resample_down_water_mark);
      printf("resample_up_water_mark: %d\n", oxcf->resample_up_water_mark);
      printf("allow_df: %d\n", oxcf->allow_df);
      printf("drop_frames_water_mark: %d\n", oxcf->drop_frames_water_mark);
      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("multi_threaded: %d\n",   oxcf->multi_threaded);
      printf("encode_breakout: %d\n", oxcf->encode_breakout);
  */
  return VPX_CODEC_OK;
}

static vpx_codec_err_t vp8e_set_config(vpx_codec_alg_priv_t *ctx,
                                       const vpx_codec_enc_cfg_t *cfg) {
  vpx_codec_err_t res;

  if (cfg->g_w != ctx->cfg.g_w || cfg->g_h != ctx->cfg.g_h) {
    if (cfg->g_lag_in_frames > 1 || cfg->g_pass != VPX_RC_ONE_PASS)
      ERROR("Cannot change width or height after initialization");
    if ((ctx->cpi->initial_width && (int)cfg->g_w > ctx->cpi->initial_width) ||
        (ctx->cpi->initial_height && (int)cfg->g_h > ctx->cpi->initial_height))
      ERROR("Cannot increase width or height larger than their initial values");
  }

  /* 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");

  res = validate_config(ctx, cfg, &ctx->vp8_cfg, 0);

  if (!res) {
    ctx->cfg = *cfg;
    set_vp8e_config(&ctx->oxcf, ctx->cfg, ctx->vp8_cfg, NULL);
    vp8_change_config(ctx->cpi, &ctx->oxcf);
  }

  return res;
}

static vpx_codec_err_t get_quantizer(vpx_codec_alg_priv_t *ctx, va_list args) {
  int *const arg = va_arg(args, int *);
  if (arg == NULL) return VPX_CODEC_INVALID_PARAM;
  *arg = vp8_get_quantizer(ctx->cpi);
  return VPX_CODEC_OK;
}

static vpx_codec_err_t get_quantizer64(vpx_codec_alg_priv_t *ctx,
                                       va_list args) {
  int *const arg = va_arg(args, int *);
  if (arg == NULL) return VPX_CODEC_INVALID_PARAM;
  *arg = vp8_reverse_trans(vp8_get_quantizer(ctx->cpi));
  return VPX_CODEC_OK;
}

static vpx_codec_err_t update_extracfg(vpx_codec_alg_priv_t *ctx,
                                       const struct vp8_extracfg *extra_cfg) {
  const vpx_codec_err_t res = validate_config(ctx, &ctx->cfg, extra_cfg, 0);
  if (res == VPX_CODEC_OK) {
    ctx->vp8_cfg = *extra_cfg;
    set_vp8e_config(&ctx->oxcf, ctx->cfg, ctx->vp8_cfg, NULL);
    vp8_change_config(ctx->cpi, &ctx->oxcf);
  }
  return res;
}

static vpx_codec_err_t set_cpu_used(vpx_codec_alg_priv_t *ctx, va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.cpu_used = CAST(VP8E_SET_CPUUSED, args);
  // Use fastest speed setting (speed 16 or -16) if it's set beyond the range.
  extra_cfg.cpu_used = VPXMIN(16, extra_cfg.cpu_used);
  extra_cfg.cpu_used = VPXMAX(-16, extra_cfg.cpu_used);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_enable_auto_alt_ref(vpx_codec_alg_priv_t *ctx,
                                               va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.enable_auto_alt_ref = CAST(VP8E_SET_ENABLEAUTOALTREF, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_noise_sensitivity(vpx_codec_alg_priv_t *ctx,
                                             va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.noise_sensitivity = CAST(VP8E_SET_NOISE_SENSITIVITY, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_sharpness(vpx_codec_alg_priv_t *ctx, va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.Sharpness = CAST(VP8E_SET_SHARPNESS, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_static_thresh(vpx_codec_alg_priv_t *ctx,
                                         va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.static_thresh = CAST(VP8E_SET_STATIC_THRESHOLD, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_token_partitions(vpx_codec_alg_priv_t *ctx,
                                            va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.token_partitions = CAST(VP8E_SET_TOKEN_PARTITIONS, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_arnr_max_frames(vpx_codec_alg_priv_t *ctx,
                                           va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.arnr_max_frames = CAST(VP8E_SET_ARNR_MAXFRAMES, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_arnr_strength(vpx_codec_alg_priv_t *ctx,
                                         va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.arnr_strength = CAST(VP8E_SET_ARNR_STRENGTH, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_arnr_type(vpx_codec_alg_priv_t *ctx, va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.arnr_type = CAST(VP8E_SET_ARNR_TYPE, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_tuning(vpx_codec_alg_priv_t *ctx, va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.tuning = CAST(VP8E_SET_TUNING, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_cq_level(vpx_codec_alg_priv_t *ctx, va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.cq_level = CAST(VP8E_SET_CQ_LEVEL, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_rc_max_intra_bitrate_pct(vpx_codec_alg_priv_t *ctx,
                                                    va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.rc_max_intra_bitrate_pct =
      CAST(VP8E_SET_MAX_INTRA_BITRATE_PCT, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t ctrl_set_rc_gf_cbr_boost_pct(vpx_codec_alg_priv_t *ctx,
                                                    va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.gf_cbr_boost_pct = CAST(VP8E_SET_GF_CBR_BOOST_PCT, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t set_screen_content_mode(vpx_codec_alg_priv_t *ctx,
                                               va_list args) {
  struct vp8_extracfg extra_cfg = ctx->vp8_cfg;
  extra_cfg.screen_content_mode = CAST(VP8E_SET_SCREEN_CONTENT_MODE, args);
  return update_extracfg(ctx, &extra_cfg);
}

static vpx_codec_err_t vp8e_mr_alloc_mem(const vpx_codec_enc_cfg_t *cfg,
                                         void **mem_loc) {
  vpx_codec_err_t res = VPX_CODEC_OK;

#if CONFIG_MULTI_RES_ENCODING
  LOWER_RES_FRAME_INFO *shared_mem_loc;
  int mb_rows = ((cfg->g_w + 15) >> 4);
  int mb_cols = ((cfg->g_h + 15) >> 4);

  shared_mem_loc = calloc(1, sizeof(LOWER_RES_FRAME_INFO));
  if (!shared_mem_loc) {
    return VPX_CODEC_MEM_ERROR;
  }

  shared_mem_loc->mb_info =
      calloc(mb_rows * mb_cols, sizeof(LOWER_RES_MB_INFO));
  if (!(shared_mem_loc->mb_info)) {
    free(shared_mem_loc);
    res = VPX_CODEC_MEM_ERROR;
  } else {
    *mem_loc = (void *)shared_mem_loc;
    res = VPX_CODEC_OK;
  }
#else
  (void)cfg;
  (void)mem_loc;
#endif
  return res;
}

static vpx_codec_err_t vp8e_init(vpx_codec_ctx_t *ctx,
                                 vpx_codec_priv_enc_mr_cfg_t *mr_cfg) {
  vpx_codec_err_t res = VPX_CODEC_OK;

  vp8_rtcd();
  vpx_dsp_rtcd();
  vpx_scale_rtcd();

  if (!ctx->priv) {
    struct vpx_codec_alg_priv *priv =
        (struct vpx_codec_alg_priv *)vpx_calloc(1, sizeof(*priv));

    if (!priv) {
      return VPX_CODEC_MEM_ERROR;
    }

    ctx->priv = (vpx_codec_priv_t *)priv;
    ctx->priv->init_flags = ctx->init_flags;

    if (ctx->config.enc) {
      /* Update the reference to the config structure to an
       * internal copy.
       */
      priv->cfg = *ctx->config.enc;
      ctx->config.enc = &priv->cfg;
    }

    priv->vp8_cfg = default_extracfg;
    priv->vp8_cfg.pkt_list = &priv->pkt_list.head;

    priv->cx_data_sz = priv->cfg.g_w * priv->cfg.g_h * 3 / 2 * 2;

    if (priv->cx_data_sz < 32768) priv->cx_data_sz = 32768;

    priv->cx_data = malloc(priv->cx_data_sz);

    if (!priv->cx_data) {
      return VPX_CODEC_MEM_ERROR;
    }

    if (mr_cfg) {
      ctx->priv->enc.total_encoders = mr_cfg->mr_total_resolutions;
    } else {
      ctx->priv->enc.total_encoders = 1;
    }

    once(vp8_initialize_enc);

    res = validate_config(priv, &priv->cfg, &priv->vp8_cfg, 0);

    if (!res) {
      priv->pts_offset_initialized = 0;
      priv->timestamp_ratio.den = priv->cfg.g_timebase.den;
      priv->timestamp_ratio.num = (int64_t)priv->cfg.g_timebase.num;
      priv->timestamp_ratio.num *= TICKS_PER_SEC;
      reduce_ratio(&priv->timestamp_ratio);

      set_vp8e_config(&priv->oxcf, priv->cfg, priv->vp8_cfg, mr_cfg);
      priv->cpi = vp8_create_compressor(&priv->oxcf);
      if (!priv->cpi) res = VPX_CODEC_MEM_ERROR;
    }
  }

  return res;
}

static vpx_codec_err_t vp8e_destroy(vpx_codec_alg_priv_t *ctx) {
#if CONFIG_MULTI_RES_ENCODING
  /* Free multi-encoder shared memory */
  if (ctx->oxcf.mr_total_resolutions > 0 &&
      (ctx->oxcf.mr_encoder_id == ctx->oxcf.mr_total_resolutions - 1)) {
    LOWER_RES_FRAME_INFO *shared_mem_loc =
        (LOWER_RES_FRAME_INFO *)ctx->oxcf.mr_low_res_mode_info;
    free(shared_mem_loc->mb_info);
    free(ctx->oxcf.mr_low_res_mode_info);
  }
#endif

  free(ctx->cx_data);
  vp8_remove_compressor(&ctx->cpi);
  vpx_free(ctx);
  return VPX_CODEC_OK;
}

static vpx_codec_err_t image2yuvconfig(const vpx_image_t *img,
                                       YV12_BUFFER_CONFIG *yv12) {
  const int y_w = img->d_w;
  const int y_h = img->d_h;
  const int uv_w = (img->d_w + 1) / 2;
  const int uv_h = (img->d_h + 1) / 2;
  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_crop_width = y_w;
  yv12->y_crop_height = y_h;
  yv12->y_width = y_w;
  yv12->y_height = y_h;
  yv12->uv_crop_width = uv_w;
  yv12->uv_crop_height = uv_h;
  yv12->uv_width = uv_w;
  yv12->uv_height = uv_h;

  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;
  return res;
}

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

#if !(CONFIG_REALTIME_ONLY)
  /* Use best quality mode if no deadline is given. */
  new_qc = MODE_BESTQUALITY;

  if (deadline) {
    /* Convert duration parameter from stream timebase to microseconds */
    uint64_t duration_us;

    COMPILE_TIME_ASSERT(TICKS_PER_SEC > 1000000 &&
                        (TICKS_PER_SEC % 1000000) == 0);

    duration_us = duration * (uint64_t)ctx->timestamp_ratio.num /
                  (ctx->timestamp_ratio.den * (TICKS_PER_SEC / 1000000));

    /* If the deadline is more that the duration this frame is to be shown,
     * use good quality mode. Otherwise use realtime mode.
     */
    new_qc = (deadline > duration_us) ? MODE_GOODQUALITY : MODE_REALTIME;
  }

#else
  (void)duration;
  new_qc = MODE_REALTIME;
#endif

  if (deadline == VPX_DL_REALTIME) {
    new_qc = MODE_REALTIME;
  } else 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;
    vp8_change_config(ctx->cpi, &ctx->oxcf);
  }
}

static vpx_codec_err_t set_reference_and_update(vpx_codec_alg_priv_t *ctx,
                                                vpx_enc_frame_flags_t flags) {
  /* 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;
  }

  if (flags &
      (VP8_EFLAG_NO_REF_LAST | VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF)) {
    int ref = 7;

    if (flags & VP8_EFLAG_NO_REF_LAST) ref ^= VP8_LAST_FRAME;

    if (flags & VP8_EFLAG_NO_REF_GF) ref ^= VP8_GOLD_FRAME;

    if (flags & VP8_EFLAG_NO_REF_ARF) ref ^= VP8_ALTR_FRAME;

    vp8_use_as_reference(ctx->cpi, ref);
  }

  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;

    if (flags & VP8_EFLAG_NO_UPD_LAST) upd ^= VP8_LAST_FRAME;

    if (flags & VP8_EFLAG_NO_UPD_GF) upd ^= VP8_GOLD_FRAME;

    if (flags & VP8_EFLAG_NO_UPD_ARF) upd ^= VP8_ALTR_FRAME;

    vp8_update_reference(ctx->cpi, upd);
  }

  if (flags & VP8_EFLAG_NO_UPD_ENTROPY) {
    vp8_update_entropy(ctx->cpi, 0);
  }

  return VPX_CODEC_OK;
}

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 enc_flags,
                                   unsigned long deadline) {
  volatile vpx_codec_err_t res = VPX_CODEC_OK;
  // Make a copy as volatile to avoid -Wclobbered with longjmp.
  volatile vpx_enc_frame_flags_t flags = enc_flags;
  volatile vpx_codec_pts_t pts_val = pts;

  if (!ctx->cfg.rc_target_bitrate) {
#if CONFIG_MULTI_RES_ENCODING
    if (!ctx->cpi) return VPX_CODEC_ERROR;
    if (ctx->cpi->oxcf.mr_total_resolutions > 1) {
      LOWER_RES_FRAME_INFO *low_res_frame_info =
          (LOWER_RES_FRAME_INFO *)ctx->cpi->oxcf.mr_low_res_mode_info;
      if (!low_res_frame_info) return VPX_CODEC_ERROR;
      low_res_frame_info->skip_encoding_prev_stream = 1;
      if (ctx->cpi->oxcf.mr_encoder_id == 0)
        low_res_frame_info->skip_encoding_base_stream = 1;
    }
#endif
    return res;
  }

  if (img) res = validate_img(ctx, img);

  if (!res) res = validate_config(ctx, &ctx->cfg, &ctx->vp8_cfg, 1);

  if (!ctx->pts_offset_initialized) {
    ctx->pts_offset = pts_val;
    ctx->pts_offset_initialized = 1;
  }
  pts_val -= ctx->pts_offset;

  pick_quickcompress_mode(ctx, duration, deadline);
  vpx_codec_pkt_list_init(&ctx->pkt_list);

  // If no flags are set in the encode call, then use the frame flags as
  // defined via the control function: vp8e_set_frame_flags.
  if (!flags) {
    flags = ctx->control_frame_flags;
  }
  ctx->control_frame_flags = 0;

  if (!res) res = set_reference_and_update(ctx, flags);

  /* 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;
    }
  }

  if (setjmp(ctx->cpi->common.error.jmp)) {
    ctx->cpi->common.error.setjmp = 0;
    vpx_clear_system_state();
    return VPX_CODEC_CORRUPT_FRAME;
  }

  /* 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;
    size_t size, cx_data_sz;
    unsigned char *cx_data;
    unsigned char *cx_data_end;
    int comp_data_state = 0;

    /* Set up internal flags */
    if (ctx->base.init_flags & VPX_CODEC_USE_PSNR) {
      ((VP8_COMP *)ctx->cpi)->b_calculate_psnr = 1;
    }

    if (ctx->base.init_flags & VPX_CODEC_USE_OUTPUT_PARTITION) {
      ((VP8_COMP *)ctx->cpi)->output_partition = 1;
    }

    /* Convert API flags to internal codec lib flags */
    lib_flags = (flags & VPX_EFLAG_FORCE_KF) ? FRAMEFLAGS_KEY : 0;

    dst_time_stamp =
        pts_val * ctx->timestamp_ratio.num / ctx->timestamp_ratio.den;
    dst_end_time_stamp = (pts_val + duration) * ctx->timestamp_ratio.num /
                         ctx->timestamp_ratio.den;

    if (img != NULL) {
      res = image2yuvconfig(img, &sd);

      if (vp8_receive_raw_frame(ctx->cpi, ctx->next_frame_flag | lib_flags, &sd,
                                dst_time_stamp, dst_end_time_stamp)) {
        VP8_COMP *cpi = (VP8_COMP *)ctx->cpi;
        res = update_error_state(ctx, &cpi->common.error);
      }

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

    cx_data = ctx->cx_data;
    cx_data_sz = ctx->cx_data_sz;
    cx_data_end = ctx->cx_data + cx_data_sz;
    lib_flags = 0;

    ctx->cpi->common.error.setjmp = 1;

    while (cx_data_sz >= ctx->cx_data_sz / 2) {
      comp_data_state = vp8_get_compressed_data(
          ctx->cpi, &lib_flags, &size, cx_data, cx_data_end, &dst_time_stamp,
          &dst_end_time_stamp, !img);

      if (comp_data_state == VPX_CODEC_CORRUPT_FRAME) {
        return VPX_CODEC_CORRUPT_FRAME;
      } else if (comp_data_state == -1) {
        break;
      }

      if (size) {
        vpx_codec_pts_t round, delta;
        vpx_codec_cx_pkt_t pkt;
        VP8_COMP *cpi = (VP8_COMP *)ctx->cpi;

        /* Add the frame packet to the list of returned packets. */
        round = (vpx_codec_pts_t)ctx->timestamp_ratio.num / 2;
        if (round > 0) --round;
        delta = (dst_end_time_stamp - dst_time_stamp);
        pkt.kind = VPX_CODEC_CX_FRAME_PKT;
        pkt.data.frame.pts =
            (dst_time_stamp * ctx->timestamp_ratio.den + round) /
                ctx->timestamp_ratio.num +
            ctx->pts_offset;
        pkt.data.frame.duration =
            (unsigned long)((delta * ctx->timestamp_ratio.den + round) /
                            ctx->timestamp_ratio.num);
        pkt.data.frame.flags = lib_flags << 16;
        pkt.data.frame.width[0] = cpi->common.Width;
        pkt.data.frame.height[0] = cpi->common.Height;
        pkt.data.frame.spatial_layer_encoded[0] = 1;

        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->timestamp_ratio.den + round) /
               ctx->timestamp_ratio.num) +
              ctx->pts_offset + 1;
          pkt.data.frame.duration = 0;
        }

        if (cpi->droppable) pkt.data.frame.flags |= VPX_FRAME_IS_DROPPABLE;

        if (cpi->output_partition) {
          int i;
          const int num_partitions =
              (1 << cpi->common.multi_token_partition) + 1;

          pkt.data.frame.flags |= VPX_FRAME_IS_FRAGMENT;

          for (i = 0; i < num_partitions; ++i) {
#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING
            pkt.data.frame.buf = cpi->partition_d[i];
#else
            pkt.data.frame.buf = cx_data;
            cx_data += cpi->partition_sz[i];
            cx_data_sz -= cpi->partition_sz[i];
#endif
            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);
          }
#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING
          /* In lagged mode the encoder can buffer multiple frames.
           * We don't want this in partitioned output because
           * partitions are spread all over the output buffer.
           * So, force an exit!
           */
          cx_data_sz -= ctx->cx_data_sz / 2;
#endif
        } else {
          pkt.data.frame.buf = cx_data;
          pkt.data.frame.sz = size;
          pkt.data.frame.partition_id = -1;
          vpx_codec_pkt_list_add(&ctx->pkt_list.head, &pkt);
          cx_data += size;
          cx_data_sz -= size;
        }
      }
    }
  }

  return res;
}

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

static vpx_codec_err_t vp8e_set_reference(vpx_codec_alg_priv_t *ctx,
                                          va_list args) {
  vpx_ref_frame_t *data = va_arg(args, vpx_ref_frame_t *);

  if (data) {
    vpx_ref_frame_t *frame = (vpx_ref_frame_t *)data;
    YV12_BUFFER_CONFIG sd;

    image2yuvconfig(&frame->img, &sd);
    vp8_set_reference(ctx->cpi, frame->frame_type, &sd);
    return VPX_CODEC_OK;
  } else {
    return VPX_CODEC_INVALID_PARAM;
  }
}

static vpx_codec_err_t vp8e_get_reference(vpx_codec_alg_priv_t *ctx,
                                          va_list args) {
  vpx_ref_frame_t *data = va_arg(args, vpx_ref_frame_t *);

  if (data) {
    vpx_ref_frame_t *frame = (vpx_ref_frame_t *)data;
    YV12_BUFFER_CONFIG sd;

    image2yuvconfig(&frame->img, &sd);
    vp8_get_reference(ctx->cpi, frame->frame_type, &sd);
    return VPX_CODEC_OK;
  } else {
    return VPX_CODEC_INVALID_PARAM;
  }
}

static vpx_codec_err_t vp8e_set_previewpp(vpx_codec_alg_priv_t *ctx,
                                          va_list args) {
#if CONFIG_POSTPROC
  vp8_postproc_cfg_t *data = va_arg(args, vp8_postproc_cfg_t *);

  if (data) {
    ctx->preview_ppcfg = *((vp8_postproc_cfg_t *)data);
    return VPX_CODEC_OK;
  } else {
    return VPX_CODEC_INVALID_PARAM;
  }
#else
  (void)ctx;
  (void)args;
  return VPX_CODEC_INCAPABLE;
#endif
}

static vpx_image_t *vp8e_get_preview(vpx_codec_alg_priv_t *ctx) {
  YV12_BUFFER_CONFIG sd;
  vp8_ppflags_t flags;
  vp8_zero(flags);

  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;
  }

  if (0 == vp8_get_preview_raw_frame(ctx->cpi, &sd, &flags)) {
    /*
    vpx_img_wrap(&ctx->preview_img, VPX_IMG_FMT_YV12,
        sd.y_width + 2*VP8BORDERINPIXELS,
        sd.y_height + 2*VP8BORDERINPIXELS,
        1,
        sd.buffer_alloc);
    vpx_img_set_rect(&ctx->preview_img,
        VP8BORDERINPIXELS, VP8BORDERINPIXELS,
        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;

    ctx->preview_img.fmt = VPX_IMG_FMT_I420;
    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;
  }
}

static vpx_codec_err_t vp8e_set_frame_flags(vpx_codec_alg_priv_t *ctx,
                                            va_list args) {
  int frame_flags = va_arg(args, int);
  ctx->control_frame_flags = frame_flags;
  return set_reference_and_update(ctx, frame_flags);
}

static vpx_codec_err_t vp8e_set_temporal_layer_id(vpx_codec_alg_priv_t *ctx,
                                                  va_list args) {
  int layer_id = va_arg(args, int);
  if (layer_id < 0 || layer_id >= (int)ctx->cfg.ts_number_layers) {
    return VPX_CODEC_INVALID_PARAM;
  }
  ctx->cpi->temporal_layer_id = layer_id;
  return VPX_CODEC_OK;
}

static vpx_codec_err_t vp8e_set_roi_map(vpx_codec_alg_priv_t *ctx,
                                        va_list args) {
  vpx_roi_map_t *data = va_arg(args, vpx_roi_map_t *);

  if (data) {
    vpx_roi_map_t *roi = (vpx_roi_map_t *)data;

    if (!vp8_set_roimap(ctx->cpi, roi->roi_map, roi->rows, roi->cols,
                        roi->delta_q, roi->delta_lf, roi->static_threshold)) {
      return VPX_CODEC_OK;
    } else {
      return VPX_CODEC_INVALID_PARAM;
    }
  } else {
    return VPX_CODEC_INVALID_PARAM;
  }
}

static vpx_codec_err_t vp8e_set_activemap(vpx_codec_alg_priv_t *ctx,
                                          va_list args) {
  vpx_active_map_t *data = va_arg(args, vpx_active_map_t *);

  if (data) {
    vpx_active_map_t *map = (vpx_active_map_t *)data;

    if (!vp8_set_active_map(ctx->cpi, map->active_map, map->rows, map->cols)) {
      return VPX_CODEC_OK;
    } else {
      return VPX_CODEC_INVALID_PARAM;
    }
  } else {
    return VPX_CODEC_INVALID_PARAM;
  }
}

static vpx_codec_err_t vp8e_set_scalemode(vpx_codec_alg_priv_t *ctx,
                                          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;
    res = vp8_set_internal_size(ctx->cpi, (VPX_SCALING)scalemode.h_scaling_mode,
                                (VPX_SCALING)scalemode.v_scaling_mode);

    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;
  }
}

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_SET_FRAME_FLAGS, vp8e_set_frame_flags },
  { VP8E_SET_TEMPORAL_LAYER_ID, vp8e_set_temporal_layer_id },
  { VP8E_SET_ROI_MAP, vp8e_set_roi_map },
  { VP8E_SET_ACTIVEMAP, vp8e_set_activemap },
  { VP8E_SET_SCALEMODE, vp8e_set_scalemode },
  { VP8E_SET_CPUUSED, set_cpu_used },
  { VP8E_SET_NOISE_SENSITIVITY, set_noise_sensitivity },
  { VP8E_SET_ENABLEAUTOALTREF, set_enable_auto_alt_ref },
  { VP8E_SET_SHARPNESS, set_sharpness },
  { VP8E_SET_STATIC_THRESHOLD, set_static_thresh },
  { VP8E_SET_TOKEN_PARTITIONS, set_token_partitions },
  { VP8E_GET_LAST_QUANTIZER, get_quantizer },
  { VP8E_GET_LAST_QUANTIZER_64, get_quantizer64 },
  { VP8E_SET_ARNR_MAXFRAMES, set_arnr_max_frames },
  { VP8E_SET_ARNR_STRENGTH, set_arnr_strength },
  { VP8E_SET_ARNR_TYPE, set_arnr_type },
  { VP8E_SET_TUNING, set_tuning },
  { VP8E_SET_CQ_LEVEL, set_cq_level },
  { VP8E_SET_MAX_INTRA_BITRATE_PCT, set_rc_max_intra_bitrate_pct },
  { VP8E_SET_SCREEN_CONTENT_MODE, set_screen_content_mode },
  { VP8E_SET_GF_CBR_BOOST_PCT, ctrl_set_rc_gf_cbr_boost_pct },
  { -1, NULL },
};

static vpx_codec_enc_cfg_map_t vp8e_usage_cfg_map[] = {
  { 0,
    {
        0, /* g_usage (unused) */
        0, /* g_threads */
        0, /* g_profile */

        320,        /* g_width */
        240,        /* g_height */
        VPX_BITS_8, /* g_bit_depth */
        8,          /* g_input_bit_depth */

        { 1, 30 }, /* g_timebase */

        0, /* g_error_resilient */

        VPX_RC_ONE_PASS, /* g_pass */

        0, /* g_lag_in_frames */

        0,  /* rc_dropframe_thresh */
        0,  /* rc_resize_allowed */
        1,  /* rc_scaled_width */
        1,  /* rc_scaled_height */
        60, /* rc_resize_down_thresold */
        30, /* rc_resize_up_thresold */

        VPX_VBR,     /* rc_end_usage */
        { NULL, 0 }, /* rc_twopass_stats_in */
        { NULL, 0 }, /* rc_firstpass_mb_stats_in */
        256,         /* rc_target_bandwidth */
        4,           /* rc_min_quantizer */
        63,          /* rc_max_quantizer */
        100,         /* rc_undershoot_pct */
        100,         /* rc_overshoot_pct */

        6000, /* rc_max_buffer_size */
        4000, /* rc_buffer_initial_size; */
        5000, /* rc_buffer_optimal_size; */

        50,  /* rc_two_pass_vbrbias  */
        0,   /* rc_two_pass_vbrmin_section */
        400, /* rc_two_pass_vbrmax_section */
        0,   // rc_2pass_vbr_corpus_complexity (only has meaningfull for VP9)

        /* keyframing settings (kf) */
        VPX_KF_AUTO, /* g_kfmode*/
        0,           /* kf_min_dist */
        128,         /* kf_max_dist */

        VPX_SS_DEFAULT_LAYERS, /* ss_number_layers */
        { 0 },
        { 0 }, /* ss_target_bitrate */
        1,     /* ts_number_layers */
        { 0 }, /* ts_target_bitrate */
        { 0 }, /* ts_rate_decimator */
        0,     /* ts_periodicity */
        { 0 }, /* ts_layer_id */
        { 0 }, /* layer_target_bitrate */
        0      /* temporal_layering_mode */
    } },
};

#ifndef VERSION_STRING
#define VERSION_STRING
#endif
CODEC_INTERFACE(vpx_codec_vp8_cx) = {
  "WebM Project VP8 Encoder" VERSION_STRING,
  VPX_CODEC_INTERNAL_ABI_VERSION,
  VPX_CODEC_CAP_ENCODER | VPX_CODEC_CAP_PSNR | VPX_CODEC_CAP_OUTPUT_PARTITION,
  /* vpx_codec_caps_t          caps; */
  vp8e_init,     /* vpx_codec_init_fn_t       init; */
  vp8e_destroy,  /* vpx_codec_destroy_fn_t    destroy; */
  vp8e_ctf_maps, /* vpx_codec_ctrl_fn_map_t  *ctrl_maps; */
  {
      NULL, /* vpx_codec_peek_si_fn_t    peek_si; */
      NULL, /* vpx_codec_get_si_fn_t     get_si; */
      NULL, /* vpx_codec_decode_fn_t     decode; */
      NULL, /* vpx_codec_frame_get_fn_t  frame_get; */
      NULL, /* vpx_codec_set_fb_fn_t     set_fb_fn; */
  },
  {
      1,                  /* 1 cfg map */
      vp8e_usage_cfg_map, /* vpx_codec_enc_cfg_map_t    cfg_maps; */
      vp8e_encode,        /* vpx_codec_encode_fn_t      encode; */
      vp8e_get_cxdata,    /* vpx_codec_get_cx_data_fn_t   get_cx_data; */
      vp8e_set_config,
      NULL,
      vp8e_get_preview,
      vp8e_mr_alloc_mem,
  } /* encoder functions */
};