/*
 *  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_decoder.h"
#include "vp9/decoder/vp9_decodeframe.h"

#include "vp9/vp9_iface_common.h"

#define VP9_CAP_POSTPROC (CONFIG_VP9_POSTPROC ? VPX_CODEC_CAP_POSTPROC : 0)

typedef vpx_codec_stream_info_t vp9_stream_info_t;

// This limit is due to framebuffer numbers.
// TODO(hkuang): Remove this limit after implementing ondemand framebuffers.
#define FRAME_CACHE_SIZE 6   // Cache maximum 6 decoded frames.

typedef struct cache_frame {
  int fb_idx;
  vpx_image_t img;
} cache_frame;

struct vpx_codec_alg_priv {
  vpx_codec_priv_t        base;
  vpx_codec_dec_cfg_t     cfg;
  vp9_stream_info_t       si;
  int                     postproc_cfg_set;
  vp8_postproc_cfg_t      postproc_cfg;
  vpx_decrypt_cb          decrypt_cb;
  void                    *decrypt_state;
  vpx_image_t             img;
  int                     img_avail;
  int                     flushed;
  int                     invert_tile_order;
  int                     last_show_frame;  // Index of last output frame.
  int                     byte_alignment;
  int                     skip_loop_filter;

  // Frame parallel related.
  int                     frame_parallel_decode;  // frame-based threading.
  VPxWorker               *frame_workers;
  int                     num_frame_workers;
  int                     next_submit_worker_id;
  int                     last_submit_worker_id;
  int                     next_output_worker_id;
  int                     available_threads;
  cache_frame             frame_cache[FRAME_CACHE_SIZE];
  int                     frame_cache_write;
  int                     frame_cache_read;
  int                     num_cache_frames;
  int                     need_resync;      // wait for key/intra-only frame
  // BufferPool that holds all reference frames. Shared by all the FrameWorkers.
  BufferPool              *buffer_pool;

  // 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;
};

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_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;
    // Only do frame parallel decode when threads > 1.
    priv->frame_parallel_decode =
        (ctx->config.dec && (ctx->config.dec->threads > 1) &&
         (ctx->init_flags & VPX_CODEC_USE_FRAME_THREADING)) ? 1 : 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->frame_workers != NULL) {
    int i;
    for (i = 0; i < ctx->num_frame_workers; ++i) {
      VPxWorker *const worker = &ctx->frame_workers[i];
      FrameWorkerData *const frame_worker_data =
          (FrameWorkerData *)worker->data1;
      vpx_get_worker_interface()->end(worker);
      vp9_remove_common(&frame_worker_data->pbi->common);
#if CONFIG_VP9_POSTPROC
      vp9_free_postproc_buffers(&frame_worker_data->pbi->common);
#endif
      vp9_decoder_remove(frame_worker_data->pbi);
      vpx_free(frame_worker_data->scratch_buffer);
#if CONFIG_MULTITHREAD
      pthread_mutex_destroy(&frame_worker_data->stats_mutex);
      pthread_cond_destroy(&frame_worker_data->stats_cond);
#endif
      vpx_free(frame_worker_data);
    }
#if CONFIG_MULTITHREAD
    pthread_mutex_destroy(&ctx->buffer_pool->pool_mutex);
#endif
  }

  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->frame_workers);
  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[9];

  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;
  }

  {
    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 ((profile >= 2 && data_sz <= 1) || data_sz < 1)
      return VPX_CODEC_UNSUP_BITSTREAM;

    if (vpx_rb_read_bit(&rb)) {  // show an existing frame
      vpx_rb_read_literal(&rb, 3);  // Frame buffer to show.
      return VPX_CODEC_OK;
    }

    if (data_sz <= 8)
      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) {
  int i;

  for (i = 0; i < ctx->num_frame_workers; ++i) {
    VPxWorker *const worker = &ctx->frame_workers[i];
    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
    VP9_COMMON *const cm = &frame_worker_data->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 int frame_worker_hook(void *arg1, void *arg2) {
  FrameWorkerData *const frame_worker_data = (FrameWorkerData *)arg1;
  const uint8_t *data = frame_worker_data->data;
  (void)arg2;

  frame_worker_data->result =
      vp9_receive_compressed_data(frame_worker_data->pbi,
                                  frame_worker_data->data_size,
                                  &data);
  frame_worker_data->data_end = data;

  if (frame_worker_data->pbi->frame_parallel_decode) {
    // In frame parallel decoding, a worker thread must successfully decode all
    // the compressed data.
    if (frame_worker_data->result != 0 ||
        frame_worker_data->data + frame_worker_data->data_size - 1 > data) {
      VPxWorker *const worker = frame_worker_data->pbi->frame_worker_owner;
      BufferPool *const pool = frame_worker_data->pbi->common.buffer_pool;
      // Signal all the other threads that are waiting for this frame.
      vp9_frameworker_lock_stats(worker);
      frame_worker_data->frame_context_ready = 1;
      lock_buffer_pool(pool);
      frame_worker_data->pbi->cur_buf->buf.corrupted = 1;
      unlock_buffer_pool(pool);
      frame_worker_data->pbi->need_resync = 1;
      vp9_frameworker_signal_stats(worker);
      vp9_frameworker_unlock_stats(worker);
      return 0;
    }
  } else if (frame_worker_data->result != 0) {
    // Check decode result in serial decode.
    frame_worker_data->pbi->cur_buf->buf.corrupted = 1;
    frame_worker_data->pbi->need_resync = 1;
  }
  return !frame_worker_data->result;
}

static vpx_codec_err_t init_decoder(vpx_codec_alg_priv_t *ctx) {
  int i;
  const VPxWorkerInterface *const winterface = vpx_get_worker_interface();

  ctx->last_show_frame = -1;
  ctx->next_submit_worker_id = 0;
  ctx->last_submit_worker_id = 0;
  ctx->next_output_worker_id = 0;
  ctx->frame_cache_read = 0;
  ctx->frame_cache_write = 0;
  ctx->num_cache_frames = 0;
  ctx->need_resync = 1;
  ctx->num_frame_workers =
      (ctx->frame_parallel_decode == 1) ? ctx->cfg.threads: 1;
  if (ctx->num_frame_workers > MAX_DECODE_THREADS)
    ctx->num_frame_workers = MAX_DECODE_THREADS;
  ctx->available_threads = ctx->num_frame_workers;
  ctx->flushed = 0;

  ctx->buffer_pool = (BufferPool *)vpx_calloc(1, sizeof(BufferPool));
  if (ctx->buffer_pool == NULL)
    return VPX_CODEC_MEM_ERROR;

#if CONFIG_MULTITHREAD
    if (pthread_mutex_init(&ctx->buffer_pool->pool_mutex, NULL)) {
      set_error_detail(ctx, "Failed to allocate buffer pool mutex");
      return VPX_CODEC_MEM_ERROR;
    }
#endif

  ctx->frame_workers = (VPxWorker *)
      vpx_malloc(ctx->num_frame_workers * sizeof(*ctx->frame_workers));
  if (ctx->frame_workers == NULL) {
    set_error_detail(ctx, "Failed to allocate frame_workers");
    return VPX_CODEC_MEM_ERROR;
  }

  for (i = 0; i < ctx->num_frame_workers; ++i) {
    VPxWorker *const worker = &ctx->frame_workers[i];
    FrameWorkerData *frame_worker_data = NULL;
    winterface->init(worker);
    worker->data1 = vpx_memalign(32, sizeof(FrameWorkerData));
    if (worker->data1 == NULL) {
      set_error_detail(ctx, "Failed to allocate frame_worker_data");
      return VPX_CODEC_MEM_ERROR;
    }
    frame_worker_data = (FrameWorkerData *)worker->data1;
    frame_worker_data->pbi = vp9_decoder_create(ctx->buffer_pool);
    if (frame_worker_data->pbi == NULL) {
      set_error_detail(ctx, "Failed to allocate frame_worker_data");
      return VPX_CODEC_MEM_ERROR;
    }
    frame_worker_data->pbi->frame_worker_owner = worker;
    frame_worker_data->worker_id = i;
    frame_worker_data->scratch_buffer = NULL;
    frame_worker_data->scratch_buffer_size = 0;
    frame_worker_data->frame_context_ready = 0;
    frame_worker_data->received_frame = 0;
#if CONFIG_MULTITHREAD
    if (pthread_mutex_init(&frame_worker_data->stats_mutex, NULL)) {
      set_error_detail(ctx, "Failed to allocate frame_worker_data mutex");
      return VPX_CODEC_MEM_ERROR;
    }

    if (pthread_cond_init(&frame_worker_data->stats_cond, NULL)) {
      set_error_detail(ctx, "Failed to allocate frame_worker_data cond");
      return VPX_CODEC_MEM_ERROR;
    }
#endif
    // If decoding in serial mode, FrameWorker thread could create tile worker
    // thread or loopfilter thread.
    frame_worker_data->pbi->max_threads =
        (ctx->frame_parallel_decode == 0) ? ctx->cfg.threads : 0;

    frame_worker_data->pbi->inv_tile_order = ctx->invert_tile_order;
    frame_worker_data->pbi->frame_parallel_decode = ctx->frame_parallel_decode;
    frame_worker_data->pbi->common.frame_parallel_decode =
        ctx->frame_parallel_decode;
    worker->hook = (VPxWorkerHook)frame_worker_hook;
    if (!winterface->reset(worker)) {
      set_error_detail(ctx, "Frame Worker thread creation failed");
      return VPX_CODEC_MEM_ERROR;
    }
  }

  // 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 worker 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) {
  const VPxWorkerInterface *const winterface = vpx_get_worker_interface();
  (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;
  }

  if (!ctx->frame_parallel_decode) {
    VPxWorker *const worker = ctx->frame_workers;
    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
    frame_worker_data->data = *data;
    frame_worker_data->data_size = data_sz;
    frame_worker_data->user_priv = user_priv;
    frame_worker_data->received_frame = 1;

    // Set these even if already initialized.  The caller may have changed the
    // decrypt config between frames.
    frame_worker_data->pbi->decrypt_cb = ctx->decrypt_cb;
    frame_worker_data->pbi->decrypt_state = ctx->decrypt_state;

    worker->had_error = 0;
    winterface->execute(worker);

    // Update data pointer after decode.
    *data = frame_worker_data->data_end;

    if (worker->had_error)
      return update_error_state(ctx, &frame_worker_data->pbi->common.error);

    check_resync(ctx, frame_worker_data->pbi);
  } else {
    VPxWorker *const worker = &ctx->frame_workers[ctx->next_submit_worker_id];
    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
    // Copy context from last worker thread to next worker thread.
    if (ctx->next_submit_worker_id != ctx->last_submit_worker_id)
      vp9_frameworker_copy_context(
          &ctx->frame_workers[ctx->next_submit_worker_id],
          &ctx->frame_workers[ctx->last_submit_worker_id]);

    frame_worker_data->pbi->ready_for_new_data = 0;
    // Copy the compressed data into worker's internal buffer.
    // TODO(hkuang): Will all the workers allocate the same size
    // as the size of the first intra frame be better? This will
    // avoid too many deallocate and allocate.
    if (frame_worker_data->scratch_buffer_size < data_sz) {
      frame_worker_data->scratch_buffer =
          (uint8_t *)vpx_realloc(frame_worker_data->scratch_buffer, data_sz);
      if (frame_worker_data->scratch_buffer == NULL) {
        set_error_detail(ctx, "Failed to reallocate scratch buffer");
        return VPX_CODEC_MEM_ERROR;
      }
      frame_worker_data->scratch_buffer_size = data_sz;
    }
    frame_worker_data->data_size = data_sz;
    memcpy(frame_worker_data->scratch_buffer, *data, data_sz);

    frame_worker_data->frame_decoded = 0;
    frame_worker_data->frame_context_ready = 0;
    frame_worker_data->received_frame = 1;
    frame_worker_data->data = frame_worker_data->scratch_buffer;
    frame_worker_data->user_priv = user_priv;

    if (ctx->next_submit_worker_id != ctx->last_submit_worker_id)
      ctx->last_submit_worker_id =
          (ctx->last_submit_worker_id + 1) % ctx->num_frame_workers;

    ctx->next_submit_worker_id =
        (ctx->next_submit_worker_id + 1) % ctx->num_frame_workers;
    --ctx->available_threads;
    worker->had_error = 0;
    winterface->launch(worker);
  }

  return VPX_CODEC_OK;
}

static void wait_worker_and_cache_frame(vpx_codec_alg_priv_t *ctx) {
  YV12_BUFFER_CONFIG sd;
  vp9_ppflags_t flags = {0, 0, 0};
  const VPxWorkerInterface *const winterface = vpx_get_worker_interface();
  VPxWorker *const worker = &ctx->frame_workers[ctx->next_output_worker_id];
  FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
  ctx->next_output_worker_id =
      (ctx->next_output_worker_id + 1) % ctx->num_frame_workers;
  // TODO(hkuang): Add worker error handling here.
  winterface->sync(worker);
  frame_worker_data->received_frame = 0;
  ++ctx->available_threads;

  check_resync(ctx, frame_worker_data->pbi);

  if (vp9_get_raw_frame(frame_worker_data->pbi, &sd, &flags) == 0) {
    VP9_COMMON *const cm = &frame_worker_data->pbi->common;
    RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
    ctx->frame_cache[ctx->frame_cache_write].fb_idx = cm->new_fb_idx;
    yuvconfig2image(&ctx->frame_cache[ctx->frame_cache_write].img, &sd,
                    frame_worker_data->user_priv);
    ctx->frame_cache[ctx->frame_cache_write].img.fb_priv =
        frame_bufs[cm->new_fb_idx].raw_frame_buffer.priv;
    ctx->frame_cache_write =
        (ctx->frame_cache_write + 1) % FRAME_CACHE_SIZE;
    ++ctx->num_cache_frames;
  }
}

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 workers on the first frame.
  if (ctx->frame_workers == 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->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];
        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;
        }

        if (ctx->available_threads == 0) {
          // No more threads for decoding. Wait until the next output worker
          // finishes decoding. Then copy the decoded frame into cache.
          if (ctx->num_cache_frames < FRAME_CACHE_SIZE) {
            wait_worker_and_cache_frame(ctx);
          } else {
            // TODO(hkuang): Add unit test to test this path.
            set_error_detail(ctx, "Frame output cache is full.");
            return VPX_CODEC_ERROR;
          }
        }

        res = decode_one(ctx, &data_start_copy, frame_size, user_priv,
                         deadline);
        if (res != VPX_CODEC_OK)
          return res;
        data_start += frame_size;
      }
    } else {
      if (ctx->available_threads == 0) {
        // No more threads for decoding. Wait until the next output worker
        // finishes decoding. Then copy the decoded frame into cache.
        if (ctx->num_cache_frames < FRAME_CACHE_SIZE) {
          wait_worker_and_cache_frame(ctx);
        } else {
          // TODO(hkuang): Add unit test to test this path.
          set_error_detail(ctx, "Frame output cache is full.");
          return VPX_CODEC_ERROR;
        }
      }

      res = decode_one(ctx, &data, data_sz, user_priv, deadline);
      if (res != VPX_CODEC_OK)
        return res;
    }
  } else {
    // 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 void release_last_output_frame(vpx_codec_alg_priv_t *ctx) {
  RefCntBuffer *const frame_bufs = ctx->buffer_pool->frame_bufs;
  // Decrease reference count of last output frame in frame parallel mode.
  if (ctx->frame_parallel_decode && ctx->last_show_frame >= 0) {
    BufferPool *const pool = ctx->buffer_pool;
    lock_buffer_pool(pool);
    decrease_ref_count(ctx->last_show_frame, frame_bufs, pool);
    unlock_buffer_pool(pool);
  }
}

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

  // Only return frame when all the cpu are busy or
  // application fluhsed the decoder in frame parallel decode.
  if (ctx->frame_parallel_decode && ctx->available_threads > 0 &&
      !ctx->flushed) {
    return NULL;
  }

  // Output the frames in the cache first.
  if (ctx->num_cache_frames > 0) {
    release_last_output_frame(ctx);
    ctx->last_show_frame  = ctx->frame_cache[ctx->frame_cache_read].fb_idx;
    if (ctx->need_resync)
      return NULL;
    img = &ctx->frame_cache[ctx->frame_cache_read].img;
    ctx->frame_cache_read = (ctx->frame_cache_read + 1) % FRAME_CACHE_SIZE;
    --ctx->num_cache_frames;
    return img;
  }

  // iter acts as a flip flop, so an image is only returned on the first
  // call to get_frame.
  if (*iter == NULL && ctx->frame_workers != NULL) {
    do {
      YV12_BUFFER_CONFIG sd;
      vp9_ppflags_t flags = {0, 0, 0};
      const VPxWorkerInterface *const winterface = vpx_get_worker_interface();
      VPxWorker *const worker =
          &ctx->frame_workers[ctx->next_output_worker_id];
      FrameWorkerData *const frame_worker_data =
          (FrameWorkerData *)worker->data1;
      ctx->next_output_worker_id =
          (ctx->next_output_worker_id + 1) % ctx->num_frame_workers;
      if (ctx->base.init_flags & VPX_CODEC_USE_POSTPROC)
        set_ppflags(ctx, &flags);
      // Wait for the frame from worker thread.
      if (winterface->sync(worker)) {
        // Check if worker has received any frames.
        if (frame_worker_data->received_frame == 1) {
          ++ctx->available_threads;
          frame_worker_data->received_frame = 0;
          check_resync(ctx, frame_worker_data->pbi);
        }
        if (vp9_get_raw_frame(frame_worker_data->pbi, &sd, &flags) == 0) {
          VP9_COMMON *const cm = &frame_worker_data->pbi->common;
          RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
          release_last_output_frame(ctx);
          ctx->last_show_frame = frame_worker_data->pbi->common.new_fb_idx;
          if (ctx->need_resync)
            return NULL;
          yuvconfig2image(&ctx->img, &sd, frame_worker_data->user_priv);
          ctx->img.fb_priv = frame_bufs[cm->new_fb_idx].raw_frame_buffer.priv;
          img = &ctx->img;
          return img;
        }
      } else {
        // Decoding failed. Release the worker thread.
        frame_worker_data->received_frame = 0;
        ++ctx->available_threads;
        ctx->need_resync = 1;
        if (ctx->flushed != 1)
          return NULL;
      }
    } while (ctx->next_output_worker_id != ctx->next_submit_worker_id);
  }
  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->frame_workers == 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 *);

  // Only support this function in serial decode.
  if (ctx->frame_parallel_decode) {
    set_error_detail(ctx, "Not supported in frame parallel decode");
    return VPX_CODEC_INCAPABLE;
  }

  if (data) {
    vpx_ref_frame_t *const frame = (vpx_ref_frame_t *)data;
    YV12_BUFFER_CONFIG sd;
    VPxWorker *const worker = ctx->frame_workers;
    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
    image2yuvconfig(&frame->img, &sd);
    return vp9_set_reference_dec(&frame_worker_data->pbi->common,
                                 (VP9_REFFRAME)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 *);

  // Only support this function in serial decode.
  if (ctx->frame_parallel_decode) {
    set_error_detail(ctx, "Not supported in frame parallel decode");
    return VPX_CODEC_INCAPABLE;
  }

  if (data) {
    vpx_ref_frame_t *frame = (vpx_ref_frame_t *) data;
    YV12_BUFFER_CONFIG sd;
    VPxWorker *const worker = ctx->frame_workers;
    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
    image2yuvconfig(&frame->img, &sd);
    return vp9_copy_reference_dec(frame_worker_data->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 *);

  // Only support this function in serial decode.
  if (ctx->frame_parallel_decode) {
    set_error_detail(ctx, "Not supported in frame parallel decode");
    return VPX_CODEC_INCAPABLE;
  }

  if (data) {
    YV12_BUFFER_CONFIG* fb;
    VPxWorker *const worker = ctx->frame_workers;
    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
    fb = get_ref_frame(&frame_worker_data->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_set_dbg_options(vpx_codec_alg_priv_t *ctx,
                                            va_list args) {
  (void)ctx;
  (void)args;
  return VPX_CODEC_INCAPABLE;
}

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 *);

  // Only support this function in serial decode.
  if (ctx->frame_parallel_decode) {
    set_error_detail(ctx, "Not supported in frame parallel decode");
    return VPX_CODEC_INCAPABLE;
  }

  if (update_info) {
    if (ctx->frame_workers) {
      VPxWorker *const worker = ctx->frame_workers;
      FrameWorkerData *const frame_worker_data =
          (FrameWorkerData *)worker->data1;
      *update_info = frame_worker_data->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->frame_workers) {
      VPxWorker *const worker = ctx->frame_workers;
      FrameWorkerData *const frame_worker_data =
          (FrameWorkerData *)worker->data1;
      RefCntBuffer *const frame_bufs =
          frame_worker_data->pbi->common.buffer_pool->frame_bufs;
      if (frame_worker_data->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 *);

  // Only support this function in serial decode.
  if (ctx->frame_parallel_decode) {
    set_error_detail(ctx, "Not supported in frame parallel decode");
    return VPX_CODEC_INCAPABLE;
  }

  if (frame_size) {
    if (ctx->frame_workers) {
      VPxWorker *const worker = ctx->frame_workers;
      FrameWorkerData *const frame_worker_data =
          (FrameWorkerData *)worker->data1;
      const VP9_COMMON *const cm = &frame_worker_data->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_display_size(vpx_codec_alg_priv_t *ctx,
                                             va_list args) {
  int *const display_size = va_arg(args, int *);

  // Only support this function in serial decode.
  if (ctx->frame_parallel_decode) {
    set_error_detail(ctx, "Not supported in frame parallel decode");
    return VPX_CODEC_INCAPABLE;
  }

  if (display_size) {
    if (ctx->frame_workers) {
      VPxWorker *const worker = ctx->frame_workers;
      FrameWorkerData *const frame_worker_data =
          (FrameWorkerData *)worker->data1;
      const VP9_COMMON *const cm = &frame_worker_data->pbi->common;
      display_size[0] = cm->display_width;
      display_size[1] = cm->display_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 *);
  VPxWorker *const worker = &ctx->frame_workers[ctx->next_output_worker_id];

  if (bit_depth) {
    if (worker) {
      FrameWorkerData *const frame_worker_data =
          (FrameWorkerData *)worker->data1;
      const VP9_COMMON *const cm = &frame_worker_data->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->frame_workers) {
    VPxWorker *const worker = ctx->frame_workers;
    FrameWorkerData *const frame_worker_data =
        (FrameWorkerData *)worker->data1;
    frame_worker_data->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->frame_workers) {
    VPxWorker *const worker = ctx->frame_workers;
    FrameWorkerData *const frame_worker_data = (FrameWorkerData *)worker->data1;
    frame_worker_data->pbi->common.skip_loop_filter = ctx->skip_loop_filter;
  }

  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},
  {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},
  {VPXD_SET_DECRYPTOR,            ctrl_set_decryptor},
  {VP9_SET_BYTE_ALIGNMENT,        ctrl_set_byte_alignment},
  {VP9_SET_SKIP_LOOP_FILTER,      ctrl_set_skip_loop_filter},

  // 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},
  {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,
  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
  }
};