/*

 * 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.

 */

#include <assert.h>

#include <limits.h>

#include <stdio.h>

#include "config/av1_rtcd.h"

#include "config/aom_dsp_rtcd.h"

#include "config/aom_scale_rtcd.h"

#include "aom_dsp/aom_dsp_common.h"

#include "aom_mem/aom_mem.h"

#include "aom_ports/aom_once.h"

#include "aom_ports/aom_timer.h"

#include "aom_scale/aom_scale.h"

#include "aom_util/aom_thread.h"

#include "av1/common/alloccommon.h"

#include "av1/common/av1_common_int.h"

#include "av1/common/av1_loopfilter.h"

#include "av1/common/quant_common.h"

#include "av1/common/reconinter.h"

#include "av1/common/reconintra.h"

#include "av1/decoder/decodeframe.h"

#include "av1/decoder/decoder.h"

#include "av1/decoder/detokenize.h"

#include "av1/decoder/obu.h"

static void initialize_dec(void) {

  av1_rtcd();

  aom_dsp_rtcd();

  aom_scale_rtcd();

  av1_init_intra_predictors();

  av1_init_wedge_masks();

}

static void dec_set_mb_mi(CommonModeInfoParams *mi_params, int width,

                          int height, int mode, BLOCK_SIZE min_partition_size) {

  (void)mode;

  (void)min_partition_size;

  // Ensure that the decoded width and height are both multiples of

  // 8 luma pixels (note: this may only be a multiple of 4 chroma pixels if

  // subsampling is used).

  // This simplifies the implementation of various experiments,

  // eg. cdef, which operates on units of 8x8 luma pixels.

  const int aligned_width = ALIGN_POWER_OF_TWO(width, 3);

  const int aligned_height = ALIGN_POWER_OF_TWO(height, 3);

  mi_params->mi_cols = aligned_width >> MI_SIZE_LOG2;

  mi_params->mi_rows = aligned_height >> MI_SIZE_LOG2;

  mi_params->mi_stride = calc_mi_size(mi_params->mi_cols);

  mi_params->mb_cols = (mi_params->mi_cols + 2) >> 2;

  mi_params->mb_rows = (mi_params->mi_rows + 2) >> 2;

  mi_params->MBs = mi_params->mb_rows * mi_params->mb_cols;

  mi_params->mi_alloc_bsize = BLOCK_4X4;

  mi_params->mi_alloc_stride = mi_params->mi_stride;

  assert(mi_size_wide[mi_params->mi_alloc_bsize] ==

         mi_size_high[mi_params->mi_alloc_bsize]);

}

static void dec_setup_mi(CommonModeInfoParams *mi_params) {

  const int mi_grid_size =

      mi_params->mi_stride * calc_mi_size(mi_params->mi_rows);

  memset(mi_params->mi_grid_base, 0,

         mi_grid_size * sizeof(*mi_params->mi_grid_base));

}

static void dec_free_mi(CommonModeInfoParams *mi_params) {

  aom_free(mi_params->mi_alloc);

  mi_params->mi_alloc = NULL;

  aom_free(mi_params->mi_grid_base);

  mi_params->mi_grid_base = NULL;

  mi_params->mi_alloc_size = 0;

  aom_free(mi_params->tx_type_map);

  mi_params->tx_type_map = NULL;

}

AV1Decoder *av1_decoder_create(BufferPool *const pool) {

  AV1Decoder *volatile const pbi = aom_memalign(32, sizeof(*pbi));

  if (!pbi) return NULL;

  av1_zero(*pbi);

  AV1_COMMON *volatile const cm = &pbi->common;

  cm->seq_params = &pbi->seq_params;

  cm->error = &pbi->error;

  // The jmp_buf is valid only for the duration of the function that calls

  // setjmp(). Therefore, this function must reset the 'setjmp' field to 0

  // before it returns.

  if (setjmp(pbi->error.jmp)) {

    pbi->error.setjmp = 0;

    av1_decoder_remove(pbi);

    return NULL;

  }

  pbi->error.setjmp = 1;

  CHECK_MEM_ERROR(cm, cm->fc,

                  (FRAME_CONTEXT *)aom_memalign(32, sizeof(*cm->fc)));

  CHECK_MEM_ERROR(

      cm, cm->default_frame_context,

      (FRAME_CONTEXT *)aom_memalign(32, sizeof(*cm->default_frame_context)));

  memset(cm->fc, 0, sizeof(*cm->fc));

  memset(cm->default_frame_context, 0, sizeof(*cm->default_frame_context));

  pbi->need_resync = 1;

  aom_once(initialize_dec);

  // Initialize the references to not point to any frame buffers.

  for (int i = 0; i < REF_FRAMES; i++) {

    cm->ref_frame_map[i] = NULL;

  }

  cm->current_frame.frame_number = 0;

  pbi->decoding_first_frame = 1;

  pbi->common.buffer_pool = pool;

  cm->seq_params->bit_depth = AOM_BITS_8;

  cm->mi_params.free_mi = dec_free_mi;

  cm->mi_params.setup_mi = dec_setup_mi;

  cm->mi_params.set_mb_mi = dec_set_mb_mi;

  av1_loop_filter_init(cm);

  av1_qm_init(&cm->quant_params, av1_num_planes(cm));

#if !CONFIG_REALTIME_ONLY

  av1_loop_restoration_precal();

#endif

#if CONFIG_ACCOUNTING

  pbi->acct_enabled = 1;

  aom_accounting_init(&pbi->accounting);

#endif

  pbi->error.setjmp = 0;

  aom_get_worker_interface()->init(&pbi->lf_worker);

  pbi->lf_worker.thread_name = "aom lf worker";

  return pbi;

}

void av1_dealloc_dec_jobs(struct AV1DecTileMTData *tile_mt_info) {

  if (tile_mt_info != NULL) {

#if CONFIG_MULTITHREAD

    if (tile_mt_info->job_mutex != NULL) {

      pthread_mutex_destroy(tile_mt_info->job_mutex);

      aom_free(tile_mt_info->job_mutex);

    }

#endif

    aom_free(tile_mt_info->job_queue);

    // clear the structure as the source of this call may be a resize in which

    // case this call will be followed by an _alloc() which may fail.

    av1_zero(*tile_mt_info);

  }

}

void av1_dec_free_cb_buf(AV1Decoder *pbi) {

  aom_free(pbi->cb_buffer_base);

  pbi->cb_buffer_base = NULL;

  pbi->cb_buffer_alloc_size = 0;

}

void av1_decoder_remove(AV1Decoder *pbi) {

  int i;

  if (!pbi) return;

  // Free the tile list output buffer.

  aom_free_frame_buffer(&pbi->tile_list_outbuf);

  aom_get_worker_interface()->end(&pbi->lf_worker);

  aom_free(pbi->lf_worker.data1);

  if (pbi->thread_data) {

    for (int worker_idx = 1; worker_idx < pbi->max_threads; worker_idx++) {

      DecWorkerData *const thread_data = pbi->thread_data + worker_idx;

      av1_free_mc_tmp_buf(thread_data->td);

      aom_free(thread_data->td);

    }

    aom_free(pbi->thread_data);

  }

  aom_free(pbi->dcb.xd.seg_mask);

  for (i = 0; i < pbi->num_workers; ++i) {

    AVxWorker *const worker = &pbi->tile_workers[i];

    aom_get_worker_interface()->end(worker);

  }

#if CONFIG_MULTITHREAD

  if (pbi->row_mt_mutex_ != NULL) {

    pthread_mutex_destroy(pbi->row_mt_mutex_);

    aom_free(pbi->row_mt_mutex_);

  }

  if (pbi->row_mt_cond_ != NULL) {

    pthread_cond_destroy(pbi->row_mt_cond_);

    aom_free(pbi->row_mt_cond_);

  }

#endif

  for (i = 0; i < pbi->allocated_tiles; i++) {

    TileDataDec *const tile_data = pbi->tile_data + i;

    av1_dec_row_mt_dealloc(&tile_data->dec_row_mt_sync);

  }

  aom_free(pbi->tile_data);

  aom_free(pbi->tile_workers);

  if (pbi->num_workers > 0) {

    av1_loop_filter_dealloc(&pbi->lf_row_sync);

#if !CONFIG_REALTIME_ONLY

    av1_loop_restoration_dealloc(&pbi->lr_row_sync, pbi->num_workers);

#endif

    av1_dealloc_dec_jobs(&pbi->tile_mt_info);

  }

  av1_dec_free_cb_buf(pbi);

#if CONFIG_ACCOUNTING

  aom_accounting_clear(&pbi->accounting);

#endif

  av1_free_mc_tmp_buf(&pbi->td);

  aom_img_metadata_array_free(pbi->metadata);

  aom_free(pbi);

}

void av1_visit_palette(AV1Decoder *const pbi, MACROBLOCKD *const xd,

                       aom_reader *r, palette_visitor_fn_t visit) {

  if (!is_inter_block(xd->mi[0])) {

    for (int plane = 0; plane < AOMMIN(2, av1_num_planes(&pbi->common));

         ++plane) {

      if (plane == 0 || xd->is_chroma_ref) {

        if (xd->mi[0]->palette_mode_info.palette_size[plane])

          visit(xd, plane, r);

      } else {

        assert(xd->mi[0]->palette_mode_info.palette_size[plane] == 0);

      }

    }

  }

}

static int equal_dimensions(const YV12_BUFFER_CONFIG *a,

                            const YV12_BUFFER_CONFIG *b) {

  return a->y_height == b->y_height && a->y_width == b->y_width &&

         a->uv_height == b->uv_height && a->uv_width == b->uv_width;

}

aom_codec_err_t av1_copy_reference_dec(AV1Decoder *pbi, int idx,

                                       YV12_BUFFER_CONFIG *sd) {

  AV1_COMMON *cm = &pbi->common;

  const int num_planes = av1_num_planes(cm);

  const YV12_BUFFER_CONFIG *const cfg = get_ref_frame(cm, idx);

  if (cfg == NULL) {

    aom_internal_error(&pbi->error, AOM_CODEC_ERROR, "No reference frame");

    return AOM_CODEC_ERROR;

  }

  if (!equal_dimensions(cfg, sd))

    aom_internal_error(&pbi->error, AOM_CODEC_ERROR,

                       "Incorrect buffer dimensions");

  else

    aom_yv12_copy_frame(cfg, sd, num_planes);

  return pbi->error.error_code;

}

static int equal_dimensions_and_border(const YV12_BUFFER_CONFIG *a,

                                       const YV12_BUFFER_CONFIG *b) {

  return a->y_height == b->y_height && a->y_width == b->y_width &&

         a->uv_height == b->uv_height && a->uv_width == b->uv_width &&

         a->y_stride == b->y_stride && a->uv_stride == b->uv_stride &&

         a->border == b->border &&

         (a->flags & YV12_FLAG_HIGHBITDEPTH) ==

             (b->flags & YV12_FLAG_HIGHBITDEPTH);

}

aom_codec_err_t av1_set_reference_dec(AV1_COMMON *cm, int idx,

                                      int use_external_ref,

                                      YV12_BUFFER_CONFIG *sd) {

  const int num_planes = av1_num_planes(cm);

  YV12_BUFFER_CONFIG *ref_buf = NULL;

  // Get the destination reference buffer.

  ref_buf = get_ref_frame(cm, idx);

  if (ref_buf == NULL) {

    aom_internal_error(cm->error, AOM_CODEC_ERROR, "No reference frame");

    return AOM_CODEC_ERROR;

  }

  if (!use_external_ref) {

    if (!equal_dimensions(ref_buf, sd)) {

      aom_internal_error(cm->error, AOM_CODEC_ERROR,

                         "Incorrect buffer dimensions");

    } else {

      // Overwrite the reference frame buffer.

      aom_yv12_copy_frame(sd, ref_buf, num_planes);

    }

  } else {

    if (!equal_dimensions_and_border(ref_buf, sd)) {

      aom_internal_error(cm->error, AOM_CODEC_ERROR,

                         "Incorrect buffer dimensions");

    } else {

      // Overwrite the reference frame buffer pointers.

      // Once we no longer need the external reference buffer, these pointers

      // are restored.

      ref_buf->store_buf_adr[0] = ref_buf->y_buffer;

      ref_buf->store_buf_adr[1] = ref_buf->u_buffer;

      ref_buf->store_buf_adr[2] = ref_buf->v_buffer;

      ref_buf->y_buffer = sd->y_buffer;

      ref_buf->u_buffer = sd->u_buffer;

      ref_buf->v_buffer = sd->v_buffer;

      ref_buf->use_external_reference_buffers = 1;

    }

  }

  return cm->error->error_code;

}

aom_codec_err_t av1_copy_new_frame_dec(AV1_COMMON *cm,

                                       YV12_BUFFER_CONFIG *new_frame,

                                       YV12_BUFFER_CONFIG *sd) {

  const int num_planes = av1_num_planes(cm);

  if (!equal_dimensions_and_border(new_frame, sd))

    aom_internal_error(cm->error, AOM_CODEC_ERROR,

                       "Incorrect buffer dimensions");

  else

    aom_yv12_copy_frame(new_frame, sd, num_planes);

  return cm->error->error_code;

}

static void release_current_frame(AV1Decoder *pbi) {

  AV1_COMMON *const cm = &pbi->common;

  BufferPool *const pool = cm->buffer_pool;

  cm->cur_frame->buf.corrupted = 1;

  lock_buffer_pool(pool);

  decrease_ref_count(cm->cur_frame, pool);

  unlock_buffer_pool(pool);

  cm->cur_frame = NULL;

}

// If any buffer updating is signaled it should be done here.

// Consumes a reference to cm->cur_frame.

//

// This functions returns void. It reports failure by setting

// pbi->error.error_code.

static void update_frame_buffers(AV1Decoder *pbi, int frame_decoded) {

  int ref_index = 0, mask;

  AV1_COMMON *const cm = &pbi->common;

  BufferPool *const pool = cm->buffer_pool;

  if (frame_decoded) {

    lock_buffer_pool(pool);

    // In ext-tile decoding, the camera frame header is only decoded once. So,

    // we don't update the references here.

    if (!pbi->camera_frame_header_ready) {

      // The following for loop needs to release the reference stored in

      // cm->ref_frame_map[ref_index] before storing a reference to

      // cm->cur_frame in cm->ref_frame_map[ref_index].

      for (mask = cm->current_frame.refresh_frame_flags; mask; mask >>= 1) {

        if (mask & 1) {

          decrease_ref_count(cm->ref_frame_map[ref_index], pool);

          cm->ref_frame_map[ref_index] = cm->cur_frame;

          ++cm->cur_frame->ref_count;

        }

        ++ref_index;

      }

    }

    if (cm->show_existing_frame || cm->show_frame) {

      if (pbi->output_all_layers) {

        // Append this frame to the output queue

        if (pbi->num_output_frames >= MAX_NUM_SPATIAL_LAYERS) {

          // We can't store the new frame anywhere, so drop it and return an

          // error

          cm->cur_frame->buf.corrupted = 1;

          decrease_ref_count(cm->cur_frame, pool);

          pbi->error.error_code = AOM_CODEC_UNSUP_BITSTREAM;

        } else {

          pbi->output_frames[pbi->num_output_frames] = cm->cur_frame;

          pbi->num_output_frames++;

        }

      } else {

        // Replace any existing output frame

        assert(pbi->num_output_frames == 0 || pbi->num_output_frames == 1);

        if (pbi->num_output_frames > 0) {

          decrease_ref_count(pbi->output_frames[0], pool);

        }

        pbi->output_frames[0] = cm->cur_frame;

        pbi->num_output_frames = 1;

      }

    } else {

      decrease_ref_count(cm->cur_frame, pool);

    }

    unlock_buffer_pool(pool);

  } else {

    // Nothing was decoded, so just drop this frame buffer

    lock_buffer_pool(pool);

    decrease_ref_count(cm->cur_frame, pool);

    unlock_buffer_pool(pool);

  }

  cm->cur_frame = NULL;

  if (!pbi->camera_frame_header_ready) {

    // Invalidate these references until the next frame starts.

    for (ref_index = 0; ref_index < INTER_REFS_PER_FRAME; ref_index++) {

      cm->remapped_ref_idx[ref_index] = INVALID_IDX;

    }

  }

}

int av1_receive_compressed_data(AV1Decoder *pbi, size_t size,

                                const uint8_t **psource) {

  AV1_COMMON *volatile const cm = &pbi->common;

  const uint8_t *source = *psource;

  pbi->error.error_code = AOM_CODEC_OK;

  pbi->error.has_detail = 0;

  if (size == 0) {

    // This is used to signal that we are missing frames.

    // We do not know if the missing frame(s) was supposed to update

    // any of the reference buffers, but we act conservative and

    // mark only the last buffer as corrupted.

    //

    // TODO(jkoleszar): Error concealment is undefined and non-normative

    // at this point, but if it becomes so, [0] may not always be the correct

    // thing to do here.

    RefCntBuffer *ref_buf = get_ref_frame_buf(cm, LAST_FRAME);

    if (ref_buf != NULL) ref_buf->buf.corrupted = 1;

  }

  if (assign_cur_frame_new_fb(cm) == NULL) {

    pbi->error.error_code = AOM_CODEC_MEM_ERROR;

    return 1;

  }

  // The jmp_buf is valid only for the duration of the function that calls

  // setjmp(). Therefore, this function must reset the 'setjmp' field to 0

  // before it returns.

  if (setjmp(pbi->error.jmp)) {

    const AVxWorkerInterface *const winterface = aom_get_worker_interface();

    int i;

    pbi->error.setjmp = 0;

    // Synchronize all threads immediately as a subsequent decode call may

    // cause a resize invalidating some allocations.

    winterface->sync(&pbi->lf_worker);

    for (i = 0; i < pbi->num_workers; ++i) {

      winterface->sync(&pbi->tile_workers[i]);

    }

    release_current_frame(pbi);

    return -1;

  }

  pbi->error.setjmp = 1;

  int frame_decoded =

      aom_decode_frame_from_obus(pbi, source, source + size, psource);

  if (frame_decoded < 0) {

    assert(pbi->error.error_code != AOM_CODEC_OK);

    release_current_frame(pbi);

    pbi->error.setjmp = 0;

    return 1;

  }

#if TXCOEFF_TIMER

  cm->cum_txcoeff_timer += cm->txcoeff_timer;

  fprintf(stderr,

          "txb coeff block number: %d, frame time: %ld, cum time %ld in us\n",

          cm->txb_count, cm->txcoeff_timer, cm->cum_txcoeff_timer);

  cm->txcoeff_timer = 0;

  cm->txb_count = 0;

#endif

  // Note: At this point, this function holds a reference to cm->cur_frame

  // in the buffer pool. This reference is consumed by update_frame_buffers().

  update_frame_buffers(pbi, frame_decoded);

  if (frame_decoded) {

    pbi->decoding_first_frame = 0;

  }

  if (pbi->error.error_code != AOM_CODEC_OK) {

    pbi->error.setjmp = 0;

    return 1;

  }

  if (!cm->show_existing_frame) {

    if (cm->seg.enabled) {

      if (cm->prev_frame &&

          (cm->mi_params.mi_rows == cm->prev_frame->mi_rows) &&

          (cm->mi_params.mi_cols == cm->prev_frame->mi_cols)) {

        cm->last_frame_seg_map = cm->prev_frame->seg_map;

      } else {

        cm->last_frame_seg_map = NULL;

      }

    }

  }

  // Update progress in frame parallel decode.

  pbi->error.setjmp = 0;

  return 0;

}

// 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) {

  if (index >= pbi->num_output_frames) return -1;

  *sd = &pbi->output_frames[index]->buf;

  *grain_params = &pbi->output_frames[index]->film_grain_params;

  return 0;

}

// Get the highest-spatial-layer output

// TODO(rachelbarker): What should this do?

int av1_get_frame_to_show(AV1Decoder *pbi, YV12_BUFFER_CONFIG *frame) {

  if (pbi->num_output_frames == 0) return -1;

  *frame = pbi->output_frames[pbi->num_output_frames - 1]->buf;

  return 0;

}