text: /*
   *  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 <stdlib.h>
  #include <string.h>
  
  #include "./vpx_config.h"
  #include "./vpx_version.h"
  
  #include "vpx/internal/vpx_codec_internal.h"
  #include "vpx/vp8dx.h"
  #include "vpx/vpx_decoder.h"
  #include "vpx_dsp/bitreader_buffer.h"
  #include "vpx_dsp/vpx_dsp_common.h"
  #include "vpx_util/vpx_thread.h"
  
  #include "vp9/common/vp9_alloccommon.h"
  #include "vp9/common/vp9_frame_buffers.h"
  
  #include "vp9/decoder/vp9_decodeframe.h"
  
  #include "vp9/vp9_dx_iface.h"
  #include "vp9/vp9_iface_common.h"
  
  #define VP9_CAP_POSTPROC (CONFIG_VP9_POSTPROC ? VPX_CODEC_CAP_POSTPROC : 0)
  
  static vpx_codec_err_t decoder_init(vpx_codec_ctx_t *ctx,
                                      vpx_codec_priv_enc_mr_cfg_t *data) {
    // This function only allocates space for the vpx_codec_alg_priv_t
    // structure. More memory may be required at the time the stream
    // information becomes known.
    (void)data;
  
    if (!ctx->priv) {
      vpx_codec_alg_priv_t *const priv =
          (vpx_codec_alg_priv_t *)vpx_calloc(1, sizeof(*priv));
      if (priv == NULL) return VPX_CODEC_MEM_ERROR;
  
      ctx->priv = (vpx_codec_priv_t *)priv;
      ctx->priv->init_flags = ctx->init_flags;
      priv->si.sz = sizeof(priv->si);
      priv->flushed = 0;
      if (ctx->config.dec) {
        priv->cfg = *ctx->config.dec;
        ctx->config.dec = &priv->cfg;
      }
    }
  
    return VPX_CODEC_OK;
  }
  
  static vpx_codec_err_t decoder_destroy(vpx_codec_alg_priv_t *ctx) {
    if (ctx->pbi != NULL) {
      vp9_decoder_remove(ctx->pbi);
    }
  
    if (ctx->buffer_pool) {
      vp9_free_ref_frame_buffers(ctx->buffer_pool);
      vp9_free_internal_frame_buffers(&ctx->buffer_pool->int_frame_buffers);
    }
  
    vpx_free(ctx->buffer_pool);
    vpx_free(ctx);
    return VPX_CODEC_OK;
  }
  
  static int parse_bitdepth_colorspace_sampling(BITSTREAM_PROFILE profile,
                                                struct vpx_read_bit_buffer *rb) {
    vpx_color_space_t color_space;
    if (profile >= PROFILE_2) rb->bit_offset += 1;  // Bit-depth 10 or 12.
    color_space = (vpx_color_space_t)vpx_rb_read_literal(rb, 3);
    if (color_space != VPX_CS_SRGB) {
      rb->bit_offset += 1;  // [16,235] (including xvycc) vs [0,255] range.
      if (profile == PROFILE_1 || profile == PROFILE_3) {
        rb->bit_offset += 2;  // subsampling x/y.
        rb->bit_offset += 1;  // unused.
      }
    } else {
      if (profile == PROFILE_1 || profile == PROFILE_3) {
        rb->bit_offset += 1;  // unused
      } else {
        // RGB is only available in version 1.
        return 0;
      }
    }
    return 1;
  }
  
  static vpx_codec_err_t decoder_peek_si_internal(
      const uint8_t *data, unsigned int data_sz, vpx_codec_stream_info_t *si,
      int *is_intra_only, vpx_decrypt_cb decrypt_cb, void *decrypt_state) {
    int intra_only_flag = 0;
    uint8_t clear_buffer[10];
  
    if (data + data_sz <= data) return VPX_CODEC_INVALID_PARAM;
  
    si->is_kf = 0;
    si->w = si->h = 0;
  
    if (decrypt_cb) {
      data_sz = VPXMIN(sizeof(clear_buffer), data_sz);
      decrypt_cb(decrypt_state, data, clear_buffer, data_sz);
      data = clear_buffer;
    }
  
    // A maximum of 6 bits are needed to read the frame marker, profile and
    // show_existing_frame.
    if (data_sz < 1) return VPX_CODEC_UNSUP_BITSTREAM;
  
    {
      int show_frame;
      int error_resilient;
      struct vpx_read_bit_buffer rb = { data, data + data_sz, 0, NULL, NULL };
      const int frame_marker = vpx_rb_read_literal(&rb, 2);
      const BITSTREAM_PROFILE profile = vp9_read_profile(&rb);
  
      if (frame_marker != VP9_FRAME_MARKER) return VPX_CODEC_UNSUP_BITSTREAM;
  
      if (profile >= MAX_PROFILES) return VPX_CODEC_UNSUP_BITSTREAM;
  
      if (vpx_rb_read_bit(&rb)) {  // show an existing frame
        // If profile is > 2 and show_existing_frame is true, then at least 1 more
        // byte (6+3=9 bits) is needed.
        if (profile > 2 && data_sz < 2) return VPX_CODEC_UNSUP_BITSTREAM;
        vpx_rb_read_literal(&rb, 3);  // Frame buffer to show.
        return VPX_CODEC_OK;
      }
  
      // For the rest of the function, a maximum of 9 more bytes are needed
      // (computed by taking the maximum possible bits needed in each case). Note
      // that this has to be updated if we read any more bits in this function.
      if (data_sz < 10) return VPX_CODEC_UNSUP_BITSTREAM;
  
      si->is_kf = !vpx_rb_read_bit(&rb);
      show_frame = vpx_rb_read_bit(&rb);
      error_resilient = vpx_rb_read_bit(&rb);
  
      if (si->is_kf) {
        if (!vp9_read_sync_code(&rb)) return VPX_CODEC_UNSUP_BITSTREAM;
  
        if (!parse_bitdepth_colorspace_sampling(profile, &rb))
          return VPX_CODEC_UNSUP_BITSTREAM;
        vp9_read_frame_size(&rb, (int *)&si->w, (int *)&si->h);
      } else {
        intra_only_flag = show_frame ? 0 : vpx_rb_read_bit(&rb);
  
        rb.bit_offset += error_resilient ? 0 : 2;  // reset_frame_context
  
        if (intra_only_flag) {
          if (!vp9_read_sync_code(&rb)) return VPX_CODEC_UNSUP_BITSTREAM;
          if (profile > PROFILE_0) {
            if (!parse_bitdepth_colorspace_sampling(profile, &rb))
              return VPX_CODEC_UNSUP_BITSTREAM;
          }
          rb.bit_offset += REF_FRAMES;  // refresh_frame_flags
          vp9_read_frame_size(&rb, (int *)&si->w, (int *)&si->h);
        }
      }
    }
    if (is_intra_only != NULL) *is_intra_only = intra_only_flag;
    return VPX_CODEC_OK;
  }
  
  static vpx_codec_err_t decoder_peek_si(const uint8_t *data,
                                         unsigned int data_sz,
                                         vpx_codec_stream_info_t *si) {
    return decoder_peek_si_internal(data, data_sz, si, NULL, NULL, NULL);
  }
  
  static vpx_codec_err_t decoder_get_si(vpx_codec_alg_priv_t *ctx,
                                        vpx_codec_stream_info_t *si) {
    const size_t sz = (si->sz >= sizeof(vp9_stream_info_t))
                          ? sizeof(vp9_stream_info_t)
                          : sizeof(vpx_codec_stream_info_t);
    memcpy(si, &ctx->si, sz);
    si->sz = (unsigned int)sz;
  
    return VPX_CODEC_OK;
  }
  
  static void set_error_detail(vpx_codec_alg_priv_t *ctx,
                               const char *const error) {
    ctx->base.err_detail = error;
  }
  
  static vpx_codec_err_t update_error_state(
      vpx_codec_alg_priv_t *ctx, const struct vpx_internal_error_info *error) {
    if (error->error_code)
      set_error_detail(ctx, error->has_detail ? error->detail : NULL);
  
    return error->error_code;
  }
  
  static void init_buffer_callbacks(vpx_codec_alg_priv_t *ctx) {
    VP9_COMMON *const cm = &ctx->pbi->common;
    BufferPool *const pool = cm->buffer_pool;
  
    cm->new_fb_idx = INVALID_IDX;
    cm->byte_alignment = ctx->byte_alignment;
    cm->skip_loop_filter = ctx->skip_loop_filter;
  
    if (ctx->get_ext_fb_cb != NULL && ctx->release_ext_fb_cb != NULL) {
      pool->get_fb_cb = ctx->get_ext_fb_cb;
      pool->release_fb_cb = ctx->release_ext_fb_cb;
      pool->cb_priv = ctx->ext_priv;
    } else {
      pool->get_fb_cb = vp9_get_frame_buffer;
      pool->release_fb_cb = vp9_release_frame_buffer;
  
      if (vp9_alloc_internal_frame_buffers(&pool->int_frame_buffers))
        vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                           "Failed to initialize internal frame buffers");
  
      pool->cb_priv = &pool->int_frame_buffers;
    }
  }
  
  static void set_default_ppflags(vp8_postproc_cfg_t *cfg) {
    cfg->post_proc_flag = VP8_DEBLOCK | VP8_DEMACROBLOCK;
    cfg->deblocking_level = 4;
    cfg->noise_level = 0;
  }
  
  static void set_ppflags(const vpx_codec_alg_priv_t *ctx, vp9_ppflags_t *flags) {
    flags->post_proc_flag = ctx->postproc_cfg.post_proc_flag;
  
    flags->deblocking_level = ctx->postproc_cfg.deblocking_level;
    flags->noise_level = ctx->postproc_cfg.noise_level;
  }
  
  static vpx_codec_err_t init_decoder(vpx_codec_alg_priv_t *ctx) {
    ctx->last_show_frame = -1;
    ctx->need_resync = 1;
    ctx->flushed = 0;
  
    ctx->buffer_pool = (BufferPool *)vpx_calloc(1, sizeof(BufferPool));
    if (ctx->buffer_pool == NULL) return VPX_CODEC_MEM_ERROR;
  
    ctx->pbi = vp9_decoder_create(ctx->buffer_pool);
    if (ctx->pbi == NULL) {
      set_error_detail(ctx, "Failed to allocate decoder");
      return VPX_CODEC_MEM_ERROR;
    }
    ctx->pbi->max_threads = ctx->cfg.threads;
    ctx->pbi->inv_tile_order = ctx->invert_tile_order;
  
    // If postprocessing was enabled by the application and a
    // configuration has not been provided, default it.
    if (!ctx->postproc_cfg_set && (ctx->base.init_flags & VPX_CODEC_USE_POSTPROC))
      set_default_ppflags(&ctx->postproc_cfg);
  
    init_buffer_callbacks(ctx);
  
    return VPX_CODEC_OK;
  }
  
  static INLINE void check_resync(vpx_codec_alg_priv_t *const ctx,
                                  const VP9Decoder *const pbi) {
    // Clear resync flag if the decoder got a key frame or intra only frame.
    if (ctx->need_resync == 1 && pbi->need_resync == 0 &&
        (pbi->common.intra_only || pbi->common.frame_type == KEY_FRAME))
      ctx->need_resync = 0;
  }
  
  static vpx_codec_err_t decode_one(vpx_codec_alg_priv_t *ctx,
                                    const uint8_t **data, unsigned int data_sz,
                                    void *user_priv, int64_t deadline) {
    (void)deadline;
  
    // Determine the stream parameters. Note that we rely on peek_si to
    // validate that we have a buffer that does not wrap around the top
    // of the heap.
    if (!ctx->si.h) {
      int is_intra_only = 0;
      const vpx_codec_err_t res =
          decoder_peek_si_internal(*data, data_sz, &ctx->si, &is_intra_only,
                                   ctx->decrypt_cb, ctx->decrypt_state);
      if (res != VPX_CODEC_OK) return res;
  
      if (!ctx->si.is_kf && !is_intra_only) return VPX_CODEC_ERROR;
    }
  
    ctx->user_priv = user_priv;
  
    // Set these even if already initialized.  The caller may have changed the
    // decrypt config between frames.
    ctx->pbi->decrypt_cb = ctx->decrypt_cb;
    ctx->pbi->decrypt_state = ctx->decrypt_state;
  
    if (vp9_receive_compressed_data(ctx->pbi, data_sz, data)) {
      ctx->pbi->cur_buf->buf.corrupted = 1;
      ctx->pbi->need_resync = 1;
      ctx->need_resync = 1;
      return update_error_state(ctx, &ctx->pbi->common.error);
    }
  
    check_resync(ctx, ctx->pbi);
  
    return VPX_CODEC_OK;
  }
  
  static vpx_codec_err_t decoder_decode(vpx_codec_alg_priv_t *ctx,
                                        const uint8_t *data, unsigned int data_sz,
                                        void *user_priv, long deadline) {
    const uint8_t *data_start = data;
    const uint8_t *const data_end = data + data_sz;
    vpx_codec_err_t res;
    uint32_t frame_sizes[8];
    int frame_count;
  
    if (data == NULL && data_sz == 0) {
      ctx->flushed = 1;
      return VPX_CODEC_OK;
    }
  
    // Reset flushed when receiving a valid frame.
    ctx->flushed = 0;
  
    // Initialize the decoder on the first frame.
    if (ctx->pbi == NULL) {
      const vpx_codec_err_t res = init_decoder(ctx);
      if (res != VPX_CODEC_OK) return res;
    }
  
    res = vp9_parse_superframe_index(data, data_sz, frame_sizes, &frame_count,
                                     ctx->decrypt_cb, ctx->decrypt_state);
    if (res != VPX_CODEC_OK) return res;
  
    if (ctx->svc_decoding && ctx->svc_spatial_layer < frame_count - 1)
      frame_count = ctx->svc_spatial_layer + 1;
  
    // Decode in serial mode.
    if (frame_count > 0) {
      int i;
  
      for (i = 0; i < frame_count; ++i) {
        const uint8_t *data_start_copy = data_start;
        const uint32_t frame_size = frame_sizes[i];
        vpx_codec_err_t res;
        if (data_start < data || frame_size > (uint32_t)(data_end - data_start)) {
          set_error_detail(ctx, "Invalid frame size in index");
          return VPX_CODEC_CORRUPT_FRAME;
        }
  
        res = decode_one(ctx, &data_start_copy, frame_size, user_priv, deadline);
        if (res != VPX_CODEC_OK) return res;
  
        data_start += frame_size;
      }
    } else {
      while (data_start < data_end) {
        const uint32_t frame_size = (uint32_t)(data_end - data_start);
        const vpx_codec_err_t res =
            decode_one(ctx, &data_start, frame_size, user_priv, deadline);
        if (res != VPX_CODEC_OK) return res;
  
        // Account for suboptimal termination by the encoder.
        while (data_start < data_end) {
          const uint8_t marker =
              read_marker(ctx->decrypt_cb, ctx->decrypt_state, data_start);
          if (marker) break;
          ++data_start;
        }
      }
    }
  
    return res;
  }
  
  static vpx_image_t *decoder_get_frame(vpx_codec_alg_priv_t *ctx,
                                        vpx_codec_iter_t *iter) {
    vpx_image_t *img = NULL;
  
    // iter acts as a flip flop, so an image is only returned on the first
    // call to get_frame.
    if (*iter == NULL && ctx->pbi != NULL) {
      YV12_BUFFER_CONFIG sd;
      vp9_ppflags_t flags = { 0, 0, 0 };
      if (ctx->base.init_flags & VPX_CODEC_USE_POSTPROC) set_ppflags(ctx, &flags);
      if (vp9_get_raw_frame(ctx->pbi, &sd, &flags) == 0) {
        VP9_COMMON *const cm = &ctx->pbi->common;
        RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
        ctx->last_show_frame = ctx->pbi->common.new_fb_idx;
        if (ctx->need_resync) return NULL;
        yuvconfig2image(&ctx->img, &sd, ctx->user_priv);
        ctx->img.fb_priv = frame_bufs[cm->new_fb_idx].raw_frame_buffer.priv;
        img = &ctx->img;
        return img;
      }
    }
    return NULL;
  }
  
  static vpx_codec_err_t decoder_set_fb_fn(
      vpx_codec_alg_priv_t *ctx, vpx_get_frame_buffer_cb_fn_t cb_get,
      vpx_release_frame_buffer_cb_fn_t cb_release, void *cb_priv) {
    if (cb_get == NULL || cb_release == NULL) {
      return VPX_CODEC_INVALID_PARAM;
    } else if (ctx->pbi == NULL) {
      // If the decoder has already been initialized, do not accept changes to
      // the frame buffer functions.
      ctx->get_ext_fb_cb = cb_get;
      ctx->release_ext_fb_cb = cb_release;
      ctx->ext_priv = cb_priv;
      return VPX_CODEC_OK;
    }
  
    return VPX_CODEC_ERROR;
  }
  
  static vpx_codec_err_t ctrl_set_reference(vpx_codec_alg_priv_t *ctx,
                                            va_list args) {
    vpx_ref_frame_t *const data = va_arg(args, vpx_ref_frame_t *);
  
    if (data) {
      vpx_ref_frame_t *const frame = (vpx_ref_frame_t *)data;
      YV12_BUFFER_CONFIG sd;
      image2yuvconfig(&frame->img, &sd);
      return vp9_set_reference_dec(
          &ctx->pbi->common, ref_frame_to_vp9_reframe(frame->frame_type), &sd);
    } else {
      return VPX_CODEC_INVALID_PARAM;
    }
  }
  
  static vpx_codec_err_t ctrl_copy_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);
      return vp9_copy_reference_dec(ctx->pbi, (VP9_REFFRAME)frame->frame_type,
                                    &sd);
    } else {
      return VPX_CODEC_INVALID_PARAM;
    }
  }
  
  static vpx_codec_err_t ctrl_get_reference(vpx_codec_alg_priv_t *ctx,
                                            va_list args) {
    vp9_ref_frame_t *data = va_arg(args, vp9_ref_frame_t *);
  
    if (data) {
      YV12_BUFFER_CONFIG *fb;
      fb = get_ref_frame(&ctx->pbi->common, data->idx);
      if (fb == NULL) return VPX_CODEC_ERROR;
      yuvconfig2image(&data->img, fb, NULL);
      return VPX_CODEC_OK;
    } else {
      return VPX_CODEC_INVALID_PARAM;
    }
  }
  
  static vpx_codec_err_t ctrl_set_postproc(vpx_codec_alg_priv_t *ctx,
                                           va_list args) {
  #if CONFIG_VP9_POSTPROC
    vp8_postproc_cfg_t *data = va_arg(args, vp8_postproc_cfg_t *);
  
    if (data) {
      ctx->postproc_cfg_set = 1;
      ctx->postproc_cfg = *((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_codec_err_t ctrl_get_quantizer(vpx_codec_alg_priv_t *ctx,
                                            va_list args) {
    int *const arg = va_arg(args, int *);
    if (arg == NULL || ctx->pbi == NULL) return VPX_CODEC_INVALID_PARAM;
    *arg = ctx->pbi->common.base_qindex;
    return VPX_CODEC_OK;
  }
  
  static vpx_codec_err_t ctrl_get_last_ref_updates(vpx_codec_alg_priv_t *ctx,
                                                   va_list args) {
    int *const update_info = va_arg(args, int *);
  
    if (update_info) {
      if (ctx->pbi != NULL) {
        *update_info = ctx->pbi->refresh_frame_flags;
        return VPX_CODEC_OK;
      } else {
        return VPX_CODEC_ERROR;
      }
    }
  
    return VPX_CODEC_INVALID_PARAM;
  }
  
  static vpx_codec_err_t ctrl_get_frame_corrupted(vpx_codec_alg_priv_t *ctx,
                                                  va_list args) {
    int *corrupted = va_arg(args, int *);
  
    if (corrupted) {
      if (ctx->pbi != NULL) {
        RefCntBuffer *const frame_bufs = ctx->pbi->common.buffer_pool->frame_bufs;
        if (ctx->pbi->common.frame_to_show == NULL) return VPX_CODEC_ERROR;
        if (ctx->last_show_frame >= 0)
          *corrupted = frame_bufs[ctx->last_show_frame].buf.corrupted;
        return VPX_CODEC_OK;
      } else {
        return VPX_CODEC_ERROR;
      }
    }
  
    return VPX_CODEC_INVALID_PARAM;
  }
  
  static vpx_codec_err_t ctrl_get_frame_size(vpx_codec_alg_priv_t *ctx,
                                             va_list args) {
    int *const frame_size = va_arg(args, int *);
  
    if (frame_size) {
      if (ctx->pbi != NULL) {
        const VP9_COMMON *const cm = &ctx->pbi->common;
        frame_size[0] = cm->width;
        frame_size[1] = cm->height;
        return VPX_CODEC_OK;
      } else {
        return VPX_CODEC_ERROR;
      }
    }
  
    return VPX_CODEC_INVALID_PARAM;
  }
  
  static vpx_codec_err_t ctrl_get_render_size(vpx_codec_alg_priv_t *ctx,
                                              va_list args) {
    int *const render_size = va_arg(args, int *);
  
    if (render_size) {
      if (ctx->pbi != NULL) {
        const VP9_COMMON *const cm = &ctx->pbi->common;
        render_size[0] = cm->render_width;
        render_size[1] = cm->render_height;
        return VPX_CODEC_OK;
      } else {
        return VPX_CODEC_ERROR;
      }
    }
  
    return VPX_CODEC_INVALID_PARAM;
  }
  
  static vpx_codec_err_t ctrl_get_bit_depth(vpx_codec_alg_priv_t *ctx,
                                            va_list args) {
    unsigned int *const bit_depth = va_arg(args, unsigned int *);
  
    if (bit_depth) {
      if (ctx->pbi != NULL) {
        const VP9_COMMON *const cm = &ctx->pbi->common;
        *bit_depth = cm->bit_depth;
        return VPX_CODEC_OK;
      } else {
        return VPX_CODEC_ERROR;
      }
    }
  
    return VPX_CODEC_INVALID_PARAM;
  }
  
  static vpx_codec_err_t ctrl_set_invert_tile_order(vpx_codec_alg_priv_t *ctx,
                                                    va_list args) {
    ctx->invert_tile_order = va_arg(args, int);
    return VPX_CODEC_OK;
  }
  
  static vpx_codec_err_t ctrl_set_decryptor(vpx_codec_alg_priv_t *ctx,
                                            va_list args) {
    vpx_decrypt_init *init = va_arg(args, vpx_decrypt_init *);
    ctx->decrypt_cb = init ? init->decrypt_cb : NULL;
    ctx->decrypt_state = init ? init->decrypt_state : NULL;
    return VPX_CODEC_OK;
  }
  
  static vpx_codec_err_t ctrl_set_byte_alignment(vpx_codec_alg_priv_t *ctx,
                                                 va_list args) {
    const int legacy_byte_alignment = 0;
    const int min_byte_alignment = 32;
    const int max_byte_alignment = 1024;
    const int byte_alignment = va_arg(args, int);
  
    if (byte_alignment != legacy_byte_alignment &&
        (byte_alignment < min_byte_alignment ||
         byte_alignment > max_byte_alignment ||
         (byte_alignment & (byte_alignment - 1)) != 0))
      return VPX_CODEC_INVALID_PARAM;
  
    ctx->byte_alignment = byte_alignment;
    if (ctx->pbi != NULL) {
      ctx->pbi->common.byte_alignment = byte_alignment;
    }
    return VPX_CODEC_OK;
  }
  
  static vpx_codec_err_t ctrl_set_skip_loop_filter(vpx_codec_alg_priv_t *ctx,
                                                   va_list args) {
    ctx->skip_loop_filter = va_arg(args, int);
  
    if (ctx->pbi != NULL) {
      ctx->pbi->common.skip_loop_filter = ctx->skip_loop_filter;
    }
  
    return VPX_CODEC_OK;
  }
  
  static vpx_codec_err_t ctrl_set_spatial_layer_svc(vpx_codec_alg_priv_t *ctx,
                                                    va_list args) {
    ctx->svc_decoding = 1;
    ctx->svc_spatial_layer = va_arg(args, int);
    if (ctx->svc_spatial_layer < 0)
      return VPX_CODEC_INVALID_PARAM;
    else
      return VPX_CODEC_OK;
  }
  
  static vpx_codec_ctrl_fn_map_t decoder_ctrl_maps[] = {
    { VP8_COPY_REFERENCE, ctrl_copy_reference },
  
    // Setters
    { VP8_SET_REFERENCE, ctrl_set_reference },
    { VP8_SET_POSTPROC, ctrl_set_postproc },
    { VP9_INVERT_TILE_DECODE_ORDER, ctrl_set_invert_tile_order },
    { VPXD_SET_DECRYPTOR, ctrl_set_decryptor },
    { VP9_SET_BYTE_ALIGNMENT, ctrl_set_byte_alignment },
    { VP9_SET_SKIP_LOOP_FILTER, ctrl_set_skip_loop_filter },
    { VP9_DECODE_SVC_SPATIAL_LAYER, ctrl_set_spatial_layer_svc },
  
    // Getters
    { VPXD_GET_LAST_QUANTIZER, ctrl_get_quantizer },
    { VP8D_GET_LAST_REF_UPDATES, ctrl_get_last_ref_updates },
    { VP8D_GET_FRAME_CORRUPTED, ctrl_get_frame_corrupted },
    { VP9_GET_REFERENCE, ctrl_get_reference },
    { VP9D_GET_DISPLAY_SIZE, ctrl_get_render_size },
    { VP9D_GET_BIT_DEPTH, ctrl_get_bit_depth },
    { VP9D_GET_FRAME_SIZE, ctrl_get_frame_size },
  
    { -1, NULL },
  };
  
  #ifndef VERSION_STRING
  #define VERSION_STRING
  #endif
  CODEC_INTERFACE(vpx_codec_vp9_dx) = {
    "WebM Project VP9 Decoder" VERSION_STRING,
    VPX_CODEC_INTERNAL_ABI_VERSION,
  #if CONFIG_VP9_HIGHBITDEPTH
    VPX_CODEC_CAP_HIGHBITDEPTH |
  #endif
        VPX_CODEC_CAP_DECODER | VP9_CAP_POSTPROC |
        VPX_CODEC_CAP_EXTERNAL_FRAME_BUFFER,  // vpx_codec_caps_t
    decoder_init,                             // vpx_codec_init_fn_t
    decoder_destroy,                          // vpx_codec_destroy_fn_t
    decoder_ctrl_maps,                        // vpx_codec_ctrl_fn_map_t
    {
        // NOLINT
        decoder_peek_si,    // vpx_codec_peek_si_fn_t
        decoder_get_si,     // vpx_codec_get_si_fn_t
        decoder_decode,     // vpx_codec_decode_fn_t
        decoder_get_frame,  // vpx_codec_frame_get_fn_t
        decoder_set_fb_fn,  // vpx_codec_set_fb_fn_t
    },
    {
        // NOLINT
        0,
        NULL,  // vpx_codec_enc_cfg_map_t
        NULL,  // vpx_codec_encode_fn_t
        NULL,  // vpx_codec_get_cx_data_fn_t
        NULL,  // vpx_codec_enc_config_set_fn_t
        NULL,  // vpx_codec_get_global_headers_fn_t
        NULL,  // vpx_codec_get_preview_frame_fn_t
        NULL   // vpx_codec_enc_mr_get_mem_loc_fn_t
    }
  };
  