vp9_dx_iface.c 20.5 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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 */

#include <stdlib.h>
#include <string.h>
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#include "./vpx_config.h"
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#include "./vpx_version.h"
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#include "vpx/internal/vpx_codec_internal.h"
#include "vpx/vp8dx.h"
#include "vpx/vpx_decoder.h"

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#include "vp9/common/vp9_frame_buffers.h"
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#include "vp9/decoder/vp9_decoder.h"
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#include "vp9/decoder/vp9_decodeframe.h"
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#include "vp9/decoder/vp9_read_bit_buffer.h"
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#include "vp9/vp9_iface_common.h"
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#define VP9_CAP_POSTPROC (CONFIG_VP9_POSTPROC ? VPX_CODEC_CAP_POSTPROC : 0)
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typedef vpx_codec_stream_info_t vp9_stream_info_t;
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struct vpx_codec_alg_priv {
  vpx_codec_priv_t        base;
  vpx_codec_dec_cfg_t     cfg;
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  vp9_stream_info_t       si;
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  struct VP9Decoder *pbi;
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  int                     postproc_cfg_set;
  vp8_postproc_cfg_t      postproc_cfg;
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  vpx_decrypt_cb          decrypt_cb;
  void                   *decrypt_state;
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  vpx_image_t             img;
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  int                     img_avail;
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  int                     flushed;
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  int                     invert_tile_order;
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  int                     frame_parallel_decode;  // frame-based threading.
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  // External frame buffer info to save for VP9 common.
  void *ext_priv;  // Private data associated with the external frame buffers.
  vpx_get_frame_buffer_cb_fn_t get_ext_fb_cb;
  vpx_release_frame_buffer_cb_fn_t release_ext_fb_cb;
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};

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static vpx_codec_err_t decoder_init(vpx_codec_ctx_t *ctx,
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                                    vpx_codec_priv_enc_mr_cfg_t *data) {
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  // 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.
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  (void)data;

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  if (!ctx->priv) {
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    vpx_codec_alg_priv_t *const priv = vpx_calloc(1, sizeof(*priv));
    if (priv == NULL)
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      return VPX_CODEC_MEM_ERROR;

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    ctx->priv = (vpx_codec_priv_t *)priv;
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    ctx->priv->init_flags = ctx->init_flags;
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    priv->si.sz = sizeof(priv->si);
    priv->flushed = 0;
    priv->frame_parallel_decode =
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        (ctx->init_flags & VPX_CODEC_USE_FRAME_THREADING);
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    priv->frame_parallel_decode = 0;  // Disable for now
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    if (ctx->config.dec) {
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      priv->cfg = *ctx->config.dec;
      ctx->config.dec = &priv->cfg;
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    }
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  }
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  return VPX_CODEC_OK;
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}

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static vpx_codec_err_t decoder_destroy(vpx_codec_alg_priv_t *ctx) {
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  if (ctx->pbi) {
    vp9_decoder_remove(ctx->pbi);
    ctx->pbi = NULL;
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  }
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  vpx_free(ctx);

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  return VPX_CODEC_OK;
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}

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static int parse_bitdepth_colorspace_sampling(
    BITSTREAM_PROFILE profile, struct vp9_read_bit_buffer *rb) {
  const int sRGB = 7;
  int colorspace;
  if (profile >= PROFILE_2)
    rb->bit_offset += 1;  // Bit-depth 10 or 12.
  colorspace = vp9_rb_read_literal(rb, 3);
  if (colorspace != 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;
}

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static vpx_codec_err_t decoder_peek_si_internal(const uint8_t *data,
                                                unsigned int data_sz,
                                                vpx_codec_stream_info_t *si,
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                                                int *is_intra_only,
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                                                vpx_decrypt_cb decrypt_cb,
                                                void *decrypt_state) {
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  int intra_only_flag = 0;
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  uint8_t clear_buffer[9];

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  if (data + data_sz <= data)
    return VPX_CODEC_INVALID_PARAM;
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  si->is_kf = 0;
  si->w = si->h = 0;
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  if (decrypt_cb) {
    data_sz = MIN(sizeof(clear_buffer), data_sz);
    decrypt_cb(decrypt_state, data, clear_buffer, data_sz);
    data = clear_buffer;
  }

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  {
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    int show_frame;
    int error_resilient;
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    struct vp9_read_bit_buffer rb = { data, data + data_sz, 0, NULL, NULL };
    const int frame_marker = vp9_rb_read_literal(&rb, 2);
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    const BITSTREAM_PROFILE profile = vp9_read_profile(&rb);
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    if (frame_marker != VP9_FRAME_MARKER)
      return VPX_CODEC_UNSUP_BITSTREAM;
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    if (profile >= MAX_PROFILES) return VPX_CODEC_UNSUP_BITSTREAM;
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    if (vp9_rb_read_bit(&rb)) {  // show an existing frame
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      vp9_rb_read_literal(&rb, 3);  // Frame buffer to show.
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      return VPX_CODEC_OK;
    }
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    if (data_sz <= 8)
      return VPX_CODEC_UNSUP_BITSTREAM;

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    si->is_kf = !vp9_rb_read_bit(&rb);
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    show_frame = vp9_rb_read_bit(&rb);
    error_resilient = vp9_rb_read_bit(&rb);

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    if (si->is_kf) {
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      if (!vp9_read_sync_code(&rb))
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        return VPX_CODEC_UNSUP_BITSTREAM;

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      if (!parse_bitdepth_colorspace_sampling(profile, &rb))
        return VPX_CODEC_UNSUP_BITSTREAM;
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      vp9_read_frame_size(&rb, (int *)&si->w, (int *)&si->h);
    } else {
      intra_only_flag = show_frame ? 0 : vp9_rb_read_bit(&rb);
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      rb.bit_offset += error_resilient ? 0 : 2;  // reset_frame_context
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      if (intra_only_flag) {
        if (!vp9_read_sync_code(&rb))
          return VPX_CODEC_UNSUP_BITSTREAM;
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        if (profile > PROFILE_0) {
          if (!parse_bitdepth_colorspace_sampling(profile, &rb))
            return VPX_CODEC_UNSUP_BITSTREAM;
        }
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        rb.bit_offset += REF_FRAMES;  // refresh_frame_flags
        vp9_read_frame_size(&rb, (int *)&si->w, (int *)&si->h);
      }
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    }
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  }
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  if (is_intra_only != NULL)
    *is_intra_only = intra_only_flag;
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  return VPX_CODEC_OK;
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}

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static vpx_codec_err_t decoder_peek_si(const uint8_t *data,
                                       unsigned int data_sz,
                                       vpx_codec_stream_info_t *si) {
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  return decoder_peek_si_internal(data, data_sz, si, NULL, NULL, NULL);
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}

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static vpx_codec_err_t decoder_get_si(vpx_codec_alg_priv_t *ctx,
                                      vpx_codec_stream_info_t *si) {
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  const size_t sz = (si->sz >= sizeof(vp9_stream_info_t))
                       ? sizeof(vp9_stream_info_t)
                       : sizeof(vpx_codec_stream_info_t);
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  memcpy(si, &ctx->si, sz);
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  si->sz = (unsigned int)sz;
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  return VPX_CODEC_OK;
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}

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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)
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    ctx->base.err_detail = error->has_detail ? error->detail : NULL;
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  return error->error_code;
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}

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static void init_buffer_callbacks(vpx_codec_alg_priv_t *ctx) {
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  VP9_COMMON *const cm = &ctx->pbi->common;
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  cm->new_fb_idx = -1;
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  if (ctx->get_ext_fb_cb != NULL && ctx->release_ext_fb_cb != NULL) {
    cm->get_fb_cb = ctx->get_ext_fb_cb;
    cm->release_fb_cb = ctx->release_ext_fb_cb;
    cm->cb_priv = ctx->ext_priv;
  } else {
    cm->get_fb_cb = vp9_get_frame_buffer;
    cm->release_fb_cb = vp9_release_frame_buffer;

    if (vp9_alloc_internal_frame_buffers(&cm->int_frame_buffers))
      vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                         "Failed to initialize internal frame buffers");

    cm->cb_priv = &cm->int_frame_buffers;
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  }
}

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;
}

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static void init_decoder(vpx_codec_alg_priv_t *ctx) {
  ctx->pbi = vp9_decoder_create();
  if (ctx->pbi == NULL)
    return;
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  ctx->pbi->max_threads = ctx->cfg.threads;
  ctx->pbi->inv_tile_order = ctx->invert_tile_order;
  ctx->pbi->frame_parallel_decode = ctx->frame_parallel_decode;
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  // 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);
}

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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) {
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  YV12_BUFFER_CONFIG sd;
  vp9_ppflags_t flags = {0, 0, 0};
  VP9_COMMON *cm = NULL;

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  (void)deadline;

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  vp9_zero(sd);
  ctx->img_avail = 0;

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  // 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.
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  if (!ctx->si.h) {
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    int is_intra_only = 0;
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    const vpx_codec_err_t res =
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        decoder_peek_si_internal(*data, data_sz, &ctx->si, &is_intra_only,
                                 ctx->decrypt_cb, ctx->decrypt_state);
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    if (res != VPX_CODEC_OK)
      return res;
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    if (!ctx->si.is_kf && !is_intra_only)
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      return VPX_CODEC_ERROR;
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  }
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  // Initialize the decoder instance on the first frame
  if (ctx->pbi == NULL) {
    init_decoder(ctx);
    if (ctx->pbi == NULL)
      return VPX_CODEC_ERROR;
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  }

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  // 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;
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  cm = &ctx->pbi->common;
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  if (vp9_receive_compressed_data(ctx->pbi, data_sz, data))
    return update_error_state(ctx, &cm->error);
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  if (ctx->base.init_flags & VPX_CODEC_USE_POSTPROC)
    set_ppflags(ctx, &flags);
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  if (vp9_get_raw_frame(ctx->pbi, &sd, &flags))
    return update_error_state(ctx, &cm->error);

  yuvconfig2image(&ctx->img, &sd, user_priv);
  ctx->img.fb_priv = cm->frame_bufs[cm->new_fb_idx].raw_frame_buffer.priv;
  ctx->img_avail = 1;

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  return VPX_CODEC_OK;
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}

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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) {
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  const uint8_t *data_start = data;
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  const uint8_t * const data_end = data + data_sz;
  vpx_codec_err_t res;
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  uint32_t frame_sizes[8];
  int frame_count;
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  if (data == NULL && data_sz == 0) {
    ctx->flushed = 1;
    return VPX_CODEC_OK;
  }

  // Reset flushed when receiving a valid frame.
  ctx->flushed = 0;
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  res = vp9_parse_superframe_index(data, data_sz, frame_sizes, &frame_count,
                                   ctx->decrypt_cb, ctx->decrypt_state);
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  if (res != VPX_CODEC_OK)
    return res;
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  if (ctx->frame_parallel_decode) {
    // Decode in frame parallel mode. When decoding in this mode, the frame
    // passed to the decoder must be either a normal frame or a superframe with
    // superframe index so the decoder could get each frame's start position
    // in the superframe.
    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)) {
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          ctx->base.err_detail = "Invalid frame size in index";
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          return VPX_CODEC_CORRUPT_FRAME;
        }

        res = decode_one(ctx, &data_start_copy, frame_size, user_priv,
                         deadline);
        if (res != VPX_CODEC_OK)
          return res;
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        data_start += frame_size;
      }
    } else {
      res = decode_one(ctx, &data_start, data_sz, user_priv, deadline);
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      if (res != VPX_CODEC_OK)
        return res;
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      // Extra data detected after the frame.
      if (data_start < data_end - 1) {
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        ctx->base.err_detail = "Fail to decode frame in parallel mode";
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        return VPX_CODEC_INCAPABLE;
      }
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    }
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  } else {
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    // 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)) {
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          ctx->base.err_detail = "Invalid frame size in index";
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          return VPX_CODEC_CORRUPT_FRAME;
        }

        res = decode_one(ctx, &data_start_copy, frame_size, user_priv,
                         deadline);
        if (res != VPX_CODEC_OK)
          return res;
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        data_start += frame_size;
      }
    } else {
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      while (data_start < data_end) {
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        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;
        }
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      }
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    }
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  }
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  return VPX_CODEC_OK;
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}

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static vpx_image_t *decoder_get_frame(vpx_codec_alg_priv_t *ctx,
                                      vpx_codec_iter_t *iter) {
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  vpx_image_t *img = NULL;

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  if (ctx->img_avail) {
    // iter acts as a flip flop, so an image is only returned on the first
    // call to get_frame.
    if (!(*iter)) {
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      img = &ctx->img;
      *iter = img;
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    }
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  }
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  ctx->img_avail = 0;
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  return img;
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}

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static vpx_codec_err_t decoder_set_fb_fn(
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    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;
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  } else if (ctx->pbi == NULL) {
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    // 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;
}

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static vpx_codec_err_t ctrl_set_reference(vpx_codec_alg_priv_t *ctx,
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                                          va_list args) {
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  vpx_ref_frame_t *const data = va_arg(args, vpx_ref_frame_t *);
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  if (data) {
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    vpx_ref_frame_t *const frame = (vpx_ref_frame_t *)data;
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    YV12_BUFFER_CONFIG sd;
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    image2yuvconfig(&frame->img, &sd);
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    return vp9_set_reference_dec(&ctx->pbi->common,
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                                 (VP9_REFFRAME)frame->frame_type, &sd);
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  } else {
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    return VPX_CODEC_INVALID_PARAM;
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  }
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}

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static vpx_codec_err_t ctrl_copy_reference(vpx_codec_alg_priv_t *ctx,
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                                           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) {
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    vpx_ref_frame_t *frame = (vpx_ref_frame_t *)data;
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    YV12_BUFFER_CONFIG sd;
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    image2yuvconfig(&frame->img, &sd);
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    return vp9_copy_reference_dec(ctx->pbi,
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                                  (VP9_REFFRAME)frame->frame_type, &sd);
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  } else {
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    return VPX_CODEC_INVALID_PARAM;
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  }
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}

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static vpx_codec_err_t ctrl_get_reference(vpx_codec_alg_priv_t *ctx,
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                                          va_list args) {
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  vp9_ref_frame_t *data = va_arg(args, vp9_ref_frame_t *);

  if (data) {
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    YV12_BUFFER_CONFIG* fb = get_ref_frame(&ctx->pbi->common, data->idx);
    if (fb == NULL) return VPX_CODEC_ERROR;
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    yuvconfig2image(&data->img, fb, NULL);
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    return VPX_CODEC_OK;
  } else {
    return VPX_CODEC_INVALID_PARAM;
  }
}

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static vpx_codec_err_t ctrl_set_postproc(vpx_codec_alg_priv_t *ctx,
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                                         va_list args) {
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#if CONFIG_VP9_POSTPROC
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  vp8_postproc_cfg_t *data = va_arg(args, vp8_postproc_cfg_t *);
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  if (data) {
    ctx->postproc_cfg_set = 1;
    ctx->postproc_cfg = *((vp8_postproc_cfg_t *)data);
    return VPX_CODEC_OK;
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  } else {
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    return VPX_CODEC_INVALID_PARAM;
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  }
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#else
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  (void)ctx;
  (void)args;
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  return VPX_CODEC_INCAPABLE;
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#endif
}

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static vpx_codec_err_t ctrl_set_dbg_options(vpx_codec_alg_priv_t *ctx,
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                                            va_list args) {
  (void)ctx;
  (void)args;
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  return VPX_CODEC_INCAPABLE;
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}
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static vpx_codec_err_t ctrl_get_last_ref_updates(vpx_codec_alg_priv_t *ctx,
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                                                 va_list args) {
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  int *const update_info = va_arg(args, int *);
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  if (update_info) {
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    if (ctx->pbi)
      *update_info = ctx->pbi->refresh_frame_flags;
    else
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      return VPX_CODEC_ERROR;
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    return VPX_CODEC_OK;
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  } else {
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    return VPX_CODEC_INVALID_PARAM;
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  }
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}


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static vpx_codec_err_t ctrl_get_frame_corrupted(vpx_codec_alg_priv_t *ctx,
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                                                va_list args) {
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  int *corrupted = va_arg(args, int *);
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  if (corrupted != NULL && ctx->pbi != NULL) {
    const YV12_BUFFER_CONFIG *const frame = ctx->pbi->common.frame_to_show;
    if (frame == NULL) return VPX_CODEC_ERROR;
    *corrupted = frame->corrupted;
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    return VPX_CODEC_OK;
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  } else {
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    return VPX_CODEC_INVALID_PARAM;
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  }
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}

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static vpx_codec_err_t ctrl_get_display_size(vpx_codec_alg_priv_t *ctx,
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                                             va_list args) {
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  int *const display_size = va_arg(args, int *);

  if (display_size) {
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    if (ctx->pbi) {
      const VP9_COMMON *const cm = &ctx->pbi->common;
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      display_size[0] = cm->display_width;
      display_size[1] = cm->display_height;
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    } else {
      return VPX_CODEC_ERROR;
    }
    return VPX_CODEC_OK;
  } else {
    return VPX_CODEC_INVALID_PARAM;
  }
}

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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) {
      const VP9_COMMON *const cm = &ctx->pbi->common;
      *bit_depth = cm->bit_depth;
      return VPX_CODEC_OK;
    } else {
      return VPX_CODEC_ERROR;
    }
  } else {
    return VPX_CODEC_INVALID_PARAM;
  }
}

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static vpx_codec_err_t ctrl_set_invert_tile_order(vpx_codec_alg_priv_t *ctx,
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                                                  va_list args) {
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  ctx->invert_tile_order = va_arg(args, int);
  return VPX_CODEC_OK;
}

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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;
}

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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},
  {VP8_SET_DBG_COLOR_REF_FRAME,   ctrl_set_dbg_options},
  {VP8_SET_DBG_COLOR_MB_MODES,    ctrl_set_dbg_options},
  {VP8_SET_DBG_COLOR_B_MODES,     ctrl_set_dbg_options},
  {VP8_SET_DBG_DISPLAY_MV,        ctrl_set_dbg_options},
  {VP9_INVERT_TILE_DECODE_ORDER,  ctrl_set_invert_tile_order},
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  {VPXD_SET_DECRYPTOR,            ctrl_set_decryptor},
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  // Getters
  {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_display_size},
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  {VP9D_GET_BIT_DEPTH,            ctrl_get_bit_depth},
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  { -1, NULL},
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};

#ifndef VERSION_STRING
#define VERSION_STRING
#endif
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CODEC_INTERFACE(vpx_codec_vp9_dx) = {
  "WebM Project VP9 Decoder" VERSION_STRING,
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  VPX_CODEC_INTERNAL_ABI_VERSION,
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  VPX_CODEC_CAP_DECODER | VP9_CAP_POSTPROC |
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      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
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  { // NOLINT
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    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
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  },
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  { // NOLINT
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    0,
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    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
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  }
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};