/*
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#ifndef AV1_DECODER_DECODER_H_
#define AV1_DECODER_DECODER_H_

#include "config/aom_config.h"

#include "aom/aom_codec.h"
#include "aom_dsp/bitreader.h"
#include "aom_scale/yv12config.h"
#include "aom_util/aom_thread.h"

#include "av1/common/thread_common.h"
#include "av1/common/onyxc_int.h"
#include "av1/decoder/dthread.h"
#if CONFIG_ACCOUNTING
#include "av1/decoder/accounting.h"
#endif
#if CONFIG_INSPECTION
#include "av1/decoder/inspection.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

typedef struct ThreadData {
  aom_reader *bit_reader;
  DECLARE_ALIGNED(32, MACROBLOCKD, xd);
  /* dqcoeff are shared by all the planes. So planes must be decoded serially */
  DECLARE_ALIGNED(32, tran_low_t, dqcoeff[MAX_TX_SQUARE]);
  CB_BUFFER cb_buffer_base;
  uint8_t *mc_buf[2];
  int32_t mc_buf_size;
} ThreadData;

typedef struct TileDataDec {
  TileInfo tile_info;
  aom_reader bit_reader;
  DECLARE_ALIGNED(16, FRAME_CONTEXT, tctx);
} TileDataDec;

typedef struct TileBufferDec {
  const uint8_t *data;
  size_t size;
} TileBufferDec;

typedef struct DataBuffer {
  const uint8_t *data;
  size_t size;
} DataBuffer;

typedef struct EXTERNAL_REFERENCES {
  YV12_BUFFER_CONFIG refs[MAX_EXTERNAL_REFERENCES];
  int num;
} EXTERNAL_REFERENCES;

typedef struct TileJobsDec {
  TileBufferDec *tile_buffer;
  TileDataDec *tile_data;
} TileJobsDec;

typedef struct AV1DecTileMTData {
#if CONFIG_MULTITHREAD
  pthread_mutex_t *job_mutex;
#endif
  TileJobsDec *job_queue;
  int jobs_enqueued;
  int jobs_dequeued;
  int alloc_tile_rows;
  int alloc_tile_cols;
} AV1DecTileMT;

typedef struct AV1Decoder {
  DECLARE_ALIGNED(32, MACROBLOCKD, mb);

  DECLARE_ALIGNED(32, AV1_COMMON, common);

  int refresh_frame_flags;

  // TODO(hkuang): Combine this with cur_buf in macroblockd as they are
  // the same.
  RefCntBuffer *cur_buf;  //  Current decoding frame buffer.

  AVxWorker *frame_worker_owner;  // frame_worker that owns this pbi.
  AVxWorker lf_worker;
  AV1LfSync lf_row_sync;
  AV1LrSync lr_row_sync;
  AV1LrStruct lr_ctxt;
  AVxWorker *tile_workers;
  int num_workers;
  DecWorkerData *thread_data;
  ThreadData td;
  TileDataDec *tile_data;
  int allocated_tiles;

  TileBufferDec tile_buffers[MAX_TILE_ROWS][MAX_TILE_COLS];
  AV1DecTileMT tile_mt_info;

  // Each time the decoder is called, we expect to receive a full temporal unit.
  // This can contain up to one shown frame per spatial layer in the current
  // operating point (note that some layers may be entirely omitted).
  // If the 'output_all_layers' option is true, we save all of these shown
  // frames so that they can be returned to the application. If the
  // 'output_all_layers' option is false, then we only output one image per
  // temporal unit.
  //
  // Note: The saved buffers are released at the start of the next time the
  // application calls aom_codec_decode().
  int output_all_layers;
  YV12_BUFFER_CONFIG *output_frames[MAX_NUM_SPATIAL_LAYERS];
  size_t output_frame_index[MAX_NUM_SPATIAL_LAYERS];  // Buffer pool indices
  size_t num_output_frames;  // How many frames are queued up so far?

  // In order to properly support random-access decoding, we need
  // to behave slightly differently for the very first frame we decode.
  // So we track whether this is the first frame or not.
  int decoding_first_frame;

  int allow_lowbitdepth;
  int max_threads;
  int inv_tile_order;
  int need_resync;   // wait for key/intra-only frame.
  int hold_ref_buf;  // hold the reference buffer.

  int tile_size_bytes;
  int tile_col_size_bytes;
  int dec_tile_row, dec_tile_col;  // always -1 for non-VR tile encoding
#if CONFIG_ACCOUNTING
  int acct_enabled;
  Accounting accounting;
#endif
  size_t uncomp_hdr_size;  // Size of the uncompressed header
  int tg_size;             // Number of tiles in the current tilegroup
  int tg_start;            // First tile in the current tilegroup
  int tg_size_bit_offset;
  int sequence_header_ready;
  int sequence_header_changed;
#if CONFIG_INSPECTION
  aom_inspect_cb inspect_cb;
  void *inspect_ctx;
#endif
  int operating_point;
  int current_operating_point;
  int seen_frame_header;

  // State if the camera frame header is already decoded while
  // large_scale_tile = 1.
  int camera_frame_header_ready;
  size_t frame_header_size;
  DataBuffer obu_size_hdr;
  int output_frame_width_in_tiles_minus_1;
  int output_frame_height_in_tiles_minus_1;
  int tile_count_minus_1;
  uint32_t coded_tile_data_size;
  unsigned int ext_tile_debug;  // for ext-tile software debug & testing
  EXTERNAL_REFERENCES ext_refs;
  size_t tile_list_size;
  uint8_t *tile_list_output;
  size_t buffer_sz;
} AV1Decoder;

int av1_receive_compressed_data(struct AV1Decoder *pbi, size_t size,
                                const uint8_t **dest);

// Get the frame at a particular index in the output queue
int av1_get_raw_frame(AV1Decoder *pbi, size_t index, YV12_BUFFER_CONFIG **sd,
                      aom_film_grain_t **grain_params);

int av1_get_frame_to_show(struct AV1Decoder *pbi, YV12_BUFFER_CONFIG *frame);

aom_codec_err_t av1_copy_reference_dec(struct AV1Decoder *pbi, int idx,
                                       YV12_BUFFER_CONFIG *sd);

aom_codec_err_t av1_set_reference_dec(AV1_COMMON *cm, int idx,
                                      int use_external_ref,
                                      YV12_BUFFER_CONFIG *sd);
aom_codec_err_t av1_copy_new_frame_dec(AV1_COMMON *cm,
                                       YV12_BUFFER_CONFIG *new_frame,
                                       YV12_BUFFER_CONFIG *sd);

struct AV1Decoder *av1_decoder_create(BufferPool *const pool);

void av1_decoder_remove(struct AV1Decoder *pbi);
void av1_dealloc_dec_jobs(struct AV1DecTileMTData *tile_jobs_sync);

static INLINE void decrease_ref_count(int idx, RefCntBuffer *const frame_bufs,
                                      BufferPool *const pool) {
  if (idx >= 0) {
    --frame_bufs[idx].ref_count;
    // A worker may only get a free framebuffer index when calling get_free_fb.
    // But the private buffer is not set up until finish decoding header.
    // So any error happens during decoding header, the frame_bufs will not
    // have valid priv buffer.
    if (frame_bufs[idx].ref_count == 0 &&
        frame_bufs[idx].raw_frame_buffer.priv) {
      pool->release_fb_cb(pool->cb_priv, &frame_bufs[idx].raw_frame_buffer);
    }
  }
}

static INLINE int dec_is_ref_frame_buf(AV1Decoder *const pbi,
                                       RefCntBuffer *frame_buf) {
  AV1_COMMON *const cm = &pbi->common;
  int i;
  for (i = 0; i < INTER_REFS_PER_FRAME; ++i) {
    RefBuffer *const ref_frame = &cm->frame_refs[i];
    if (ref_frame->idx == INVALID_IDX) continue;
    if (frame_buf == &cm->buffer_pool->frame_bufs[ref_frame->idx]) break;
  }
  return (i < INTER_REFS_PER_FRAME);
}

#define ACCT_STR __func__
static INLINE int av1_read_uniform(aom_reader *r, int n) {
  const int l = get_unsigned_bits(n);
  const int m = (1 << l) - n;
  const int v = aom_read_literal(r, l - 1, ACCT_STR);
  assert(l != 0);
  if (v < m)
    return v;
  else
    return (v << 1) - m + aom_read_literal(r, 1, ACCT_STR);
}

typedef void (*palette_visitor_fn_t)(MACROBLOCKD *const xd, int plane,
                                     aom_reader *r);

void av1_visit_palette(AV1Decoder *const pbi, MACROBLOCKD *const xd, int mi_row,
                       int mi_col, aom_reader *r, BLOCK_SIZE bsize,
                       palette_visitor_fn_t visit);

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // AV1_DECODER_DECODER_H_