/*
 *  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 "vp8/common/onyxc_int.h"
#if CONFIG_POSTPROC
#include "vp8/common/postproc.h"
#endif
#include "vp8/common/onyxd.h"
#include "onyxd_int.h"
#include "vpx_mem/vpx_mem.h"
#include "vp8/common/alloccommon.h"
#include "vp8/common/common.h"
#include "vp8/common/loopfilter.h"
#include "vp8/common/swapyv12buffer.h"
#include "vp8/common/threading.h"
#include "decoderthreading.h"
#include <stdio.h>
#include <assert.h>

#include "vp8/common/quant_common.h"
#include "vp8/common/reconintra.h"
#include "./vpx_dsp_rtcd.h"
#include "./vpx_scale_rtcd.h"
#include "vpx_scale/vpx_scale.h"
#include "vp8/common/systemdependent.h"
#include "vpx_ports/system_state.h"
#include "vpx_ports/vpx_once.h"
#include "vpx_ports/vpx_timer.h"
#include "detokenize.h"
#if CONFIG_ERROR_CONCEALMENT
#include "error_concealment.h"
#endif
#if VPX_ARCH_ARM
#include "vpx_ports/arm.h"
#endif

extern void vp8_init_loop_filter(VP8_COMMON *cm);
static int get_free_fb(VP8_COMMON *cm);
static void ref_cnt_fb(int *buf, int *idx, int new_idx);

static void initialize_dec(void) {
  static volatile int init_done = 0;

  if (!init_done) {
    vpx_dsp_rtcd();
    vp8_init_intra_predictors();
    init_done = 1;
  }
}

static void remove_decompressor(VP8D_COMP *pbi) {
#if CONFIG_ERROR_CONCEALMENT
  vp8_de_alloc_overlap_lists(pbi);
#endif
  vp8_remove_common(&pbi->common);
  vpx_free(pbi);
}

static struct VP8D_COMP *create_decompressor(VP8D_CONFIG *oxcf) {
  VP8D_COMP *pbi = vpx_memalign(32, sizeof(VP8D_COMP));

  if (!pbi) return NULL;

  memset(pbi, 0, sizeof(VP8D_COMP));

  if (setjmp(pbi->common.error.jmp)) {
    pbi->common.error.setjmp = 0;
    remove_decompressor(pbi);
    return 0;
  }

  pbi->common.error.setjmp = 1;

  vp8_create_common(&pbi->common);

  pbi->common.current_video_frame = 0;
  pbi->ready_for_new_data = 1;

  /* vp8cx_init_de_quantizer() is first called here. Add check in
   * frame_init_dequantizer() to avoid
   *  unnecessary calling of vp8cx_init_de_quantizer() for every frame.
   */
  vp8cx_init_de_quantizer(pbi);

  vp8_loop_filter_init(&pbi->common);

  pbi->common.error.setjmp = 0;

#if CONFIG_ERROR_CONCEALMENT
  pbi->ec_enabled = oxcf->error_concealment;
  pbi->overlaps = NULL;
#else
  (void)oxcf;
  pbi->ec_enabled = 0;
#endif
  /* Error concealment is activated after a key frame has been
   * decoded without errors when error concealment is enabled.
   */
  pbi->ec_active = 0;

  pbi->decoded_key_frame = 0;

  /* Independent partitions is activated when a frame updates the
   * token probability table to have equal probabilities over the
   * PREV_COEF context.
   */
  pbi->independent_partitions = 0;

  vp8_setup_block_dptrs(&pbi->mb);

  once(initialize_dec);

  return pbi;
}

vpx_codec_err_t vp8dx_get_reference(VP8D_COMP *pbi,
                                    enum vpx_ref_frame_type ref_frame_flag,
                                    YV12_BUFFER_CONFIG *sd) {
  VP8_COMMON *cm = &pbi->common;
  int ref_fb_idx;

  if (ref_frame_flag == VP8_LAST_FRAME) {
    ref_fb_idx = cm->lst_fb_idx;
  } else if (ref_frame_flag == VP8_GOLD_FRAME) {
    ref_fb_idx = cm->gld_fb_idx;
  } else if (ref_frame_flag == VP8_ALTR_FRAME) {
    ref_fb_idx = cm->alt_fb_idx;
  } else {
    vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
                       "Invalid reference frame");
    return pbi->common.error.error_code;
  }

  if (cm->yv12_fb[ref_fb_idx].y_height != sd->y_height ||
      cm->yv12_fb[ref_fb_idx].y_width != sd->y_width ||
      cm->yv12_fb[ref_fb_idx].uv_height != sd->uv_height ||
      cm->yv12_fb[ref_fb_idx].uv_width != sd->uv_width) {
    vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
                       "Incorrect buffer dimensions");
  } else
    vp8_yv12_copy_frame(&cm->yv12_fb[ref_fb_idx], sd);

  return pbi->common.error.error_code;
}

vpx_codec_err_t vp8dx_set_reference(VP8D_COMP *pbi,
                                    enum vpx_ref_frame_type ref_frame_flag,
                                    YV12_BUFFER_CONFIG *sd) {
  VP8_COMMON *cm = &pbi->common;
  int *ref_fb_ptr = NULL;
  int free_fb;

  if (ref_frame_flag == VP8_LAST_FRAME) {
    ref_fb_ptr = &cm->lst_fb_idx;
  } else if (ref_frame_flag == VP8_GOLD_FRAME) {
    ref_fb_ptr = &cm->gld_fb_idx;
  } else if (ref_frame_flag == VP8_ALTR_FRAME) {
    ref_fb_ptr = &cm->alt_fb_idx;
  } else {
    vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
                       "Invalid reference frame");
    return pbi->common.error.error_code;
  }

  if (cm->yv12_fb[*ref_fb_ptr].y_height != sd->y_height ||
      cm->yv12_fb[*ref_fb_ptr].y_width != sd->y_width ||
      cm->yv12_fb[*ref_fb_ptr].uv_height != sd->uv_height ||
      cm->yv12_fb[*ref_fb_ptr].uv_width != sd->uv_width) {
    vpx_internal_error(&pbi->common.error, VPX_CODEC_ERROR,
                       "Incorrect buffer dimensions");
  } else {
    /* Find an empty frame buffer. */
    free_fb = get_free_fb(cm);
    /* Decrease fb_idx_ref_cnt since it will be increased again in
     * ref_cnt_fb() below. */
    cm->fb_idx_ref_cnt[free_fb]--;

    /* Manage the reference counters and copy image. */
    ref_cnt_fb(cm->fb_idx_ref_cnt, ref_fb_ptr, free_fb);
    vp8_yv12_copy_frame(sd, &cm->yv12_fb[*ref_fb_ptr]);
  }

  return pbi->common.error.error_code;
}

static int get_free_fb(VP8_COMMON *cm) {
  int i;
  for (i = 0; i < NUM_YV12_BUFFERS; ++i) {
    if (cm->fb_idx_ref_cnt[i] == 0) break;
  }

  assert(i < NUM_YV12_BUFFERS);
  cm->fb_idx_ref_cnt[i] = 1;
  return i;
}

static void ref_cnt_fb(int *buf, int *idx, int new_idx) {
  if (buf[*idx] > 0) buf[*idx]--;

  *idx = new_idx;

  buf[new_idx]++;
}

/* If any buffer copy / swapping is signalled it should be done here. */
static int swap_frame_buffers(VP8_COMMON *cm) {
  int err = 0;

  /* The alternate reference frame or golden frame can be updated
   *  using the new, last, or golden/alt ref frame.  If it
   *  is updated using the newly decoded frame it is a refresh.
   *  An update using the last or golden/alt ref frame is a copy.
   */
  if (cm->copy_buffer_to_arf) {
    int new_fb = 0;

    if (cm->copy_buffer_to_arf == 1) {
      new_fb = cm->lst_fb_idx;
    } else if (cm->copy_buffer_to_arf == 2) {
      new_fb = cm->gld_fb_idx;
    } else {
      err = -1;
    }

    ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->alt_fb_idx, new_fb);
  }

  if (cm->copy_buffer_to_gf) {
    int new_fb = 0;

    if (cm->copy_buffer_to_gf == 1) {
      new_fb = cm->lst_fb_idx;
    } else if (cm->copy_buffer_to_gf == 2) {
      new_fb = cm->alt_fb_idx;
    } else {
      err = -1;
    }

    ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->gld_fb_idx, new_fb);
  }

  if (cm->refresh_golden_frame) {
    ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->gld_fb_idx, cm->new_fb_idx);
  }

  if (cm->refresh_alt_ref_frame) {
    ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->alt_fb_idx, cm->new_fb_idx);
  }

  if (cm->refresh_last_frame) {
    ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->lst_fb_idx, cm->new_fb_idx);

    cm->frame_to_show = &cm->yv12_fb[cm->lst_fb_idx];
  } else {
    cm->frame_to_show = &cm->yv12_fb[cm->new_fb_idx];
  }

  cm->fb_idx_ref_cnt[cm->new_fb_idx]--;

  return err;
}

static int check_fragments_for_errors(VP8D_COMP *pbi) {
  if (!pbi->ec_active && pbi->fragments.count <= 1 &&
      pbi->fragments.sizes[0] == 0) {
    VP8_COMMON *cm = &pbi->common;

    /* If error concealment is disabled we won't signal missing frames
     * to the decoder.
     */
    if (cm->fb_idx_ref_cnt[cm->lst_fb_idx] > 1) {
      /* The last reference shares buffer with another reference
       * buffer. Move it to its own buffer before setting it as
       * corrupt, otherwise we will make multiple buffers corrupt.
       */
      const int prev_idx = cm->lst_fb_idx;
      cm->fb_idx_ref_cnt[prev_idx]--;
      cm->lst_fb_idx = get_free_fb(cm);
      vp8_yv12_copy_frame(&cm->yv12_fb[prev_idx], &cm->yv12_fb[cm->lst_fb_idx]);
    }
    /* 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.
     */
    cm->yv12_fb[cm->lst_fb_idx].corrupted = 1;

    /* Signal that we have no frame to show. */
    cm->show_frame = 0;

    /* Nothing more to do. */
    return 0;
  }

  return 1;
}

int vp8dx_receive_compressed_data(VP8D_COMP *pbi) {
  VP8_COMMON *cm = &pbi->common;
  int retcode = -1;

  pbi->common.error.error_code = VPX_CODEC_OK;

  retcode = check_fragments_for_errors(pbi);
  if (retcode <= 0) return retcode;

  cm->new_fb_idx = get_free_fb(cm);

  /* setup reference frames for vp8_decode_frame */
  pbi->dec_fb_ref[INTRA_FRAME] = &cm->yv12_fb[cm->new_fb_idx];
  pbi->dec_fb_ref[LAST_FRAME] = &cm->yv12_fb[cm->lst_fb_idx];
  pbi->dec_fb_ref[GOLDEN_FRAME] = &cm->yv12_fb[cm->gld_fb_idx];
  pbi->dec_fb_ref[ALTREF_FRAME] = &cm->yv12_fb[cm->alt_fb_idx];

  retcode = vp8_decode_frame(pbi);

  if (retcode < 0) {
    if (cm->fb_idx_ref_cnt[cm->new_fb_idx] > 0) {
      cm->fb_idx_ref_cnt[cm->new_fb_idx]--;
    }

    pbi->common.error.error_code = VPX_CODEC_ERROR;
    // Propagate the error info.
    if (pbi->mb.error_info.error_code != 0) {
      pbi->common.error.error_code = pbi->mb.error_info.error_code;
      memcpy(pbi->common.error.detail, pbi->mb.error_info.detail,
             sizeof(pbi->mb.error_info.detail));
    }
    goto decode_exit;
  }

  if (swap_frame_buffers(cm)) {
    pbi->common.error.error_code = VPX_CODEC_ERROR;
    goto decode_exit;
  }

  vpx_clear_system_state();

  if (cm->show_frame) {
    cm->current_video_frame++;
    cm->show_frame_mi = cm->mi;
  }

#if CONFIG_ERROR_CONCEALMENT
  /* swap the mode infos to storage for future error concealment */
  if (pbi->ec_enabled && pbi->common.prev_mi) {
    MODE_INFO *tmp = pbi->common.prev_mi;
    int row, col;
    pbi->common.prev_mi = pbi->common.mi;
    pbi->common.mi = tmp;

    /* Propagate the segment_ids to the next frame */
    for (row = 0; row < pbi->common.mb_rows; ++row) {
      for (col = 0; col < pbi->common.mb_cols; ++col) {
        const int i = row * pbi->common.mode_info_stride + col;
        pbi->common.mi[i].mbmi.segment_id =
            pbi->common.prev_mi[i].mbmi.segment_id;
      }
    }
  }
#endif

  pbi->ready_for_new_data = 0;

decode_exit:
  vpx_clear_system_state();
  return retcode;
}
int vp8dx_get_raw_frame(VP8D_COMP *pbi, YV12_BUFFER_CONFIG *sd,
                        vp8_ppflags_t *flags) {
  int ret = -1;

  if (pbi->ready_for_new_data == 1) return ret;

  /* ie no raw frame to show!!! */
  if (pbi->common.show_frame == 0) return ret;

  pbi->ready_for_new_data = 1;

#if CONFIG_POSTPROC
  ret = vp8_post_proc_frame(&pbi->common, sd, flags);
#else
  (void)flags;

  if (pbi->common.frame_to_show) {
    *sd = *pbi->common.frame_to_show;
    sd->y_width = pbi->common.Width;
    sd->y_height = pbi->common.Height;
    sd->uv_height = pbi->common.Height / 2;
    ret = 0;
  } else {
    ret = -1;
  }

#endif /*!CONFIG_POSTPROC*/
  vpx_clear_system_state();
  return ret;
}

/* This function as written isn't decoder specific, but the encoder has
 * much faster ways of computing this, so it's ok for it to live in a
 * decode specific file.
 */
int vp8dx_references_buffer(VP8_COMMON *oci, int ref_frame) {
  const MODE_INFO *mi = oci->mi;
  int mb_row, mb_col;

  for (mb_row = 0; mb_row < oci->mb_rows; ++mb_row) {
    for (mb_col = 0; mb_col < oci->mb_cols; mb_col++, mi++) {
      if (mi->mbmi.ref_frame == ref_frame) return 1;
    }
    mi++;
  }
  return 0;
}

int vp8_create_decoder_instances(struct frame_buffers *fb, VP8D_CONFIG *oxcf) {
  /* decoder instance for single thread mode */
  fb->pbi[0] = create_decompressor(oxcf);
  if (!fb->pbi[0]) return VPX_CODEC_ERROR;

#if CONFIG_MULTITHREAD
  if (setjmp(fb->pbi[0]->common.error.jmp)) {
    fb->pbi[0]->common.error.setjmp = 0;
    vp8_remove_decoder_instances(fb);
    vp8_zero(fb->pbi);
    vpx_clear_system_state();
    return VPX_CODEC_ERROR;
  }

  fb->pbi[0]->common.error.setjmp = 1;
  fb->pbi[0]->max_threads = oxcf->max_threads;
  vp8_decoder_create_threads(fb->pbi[0]);
  fb->pbi[0]->common.error.setjmp = 0;
#endif
  return VPX_CODEC_OK;
}

int vp8_remove_decoder_instances(struct frame_buffers *fb) {
  VP8D_COMP *pbi = fb->pbi[0];

  if (!pbi) return VPX_CODEC_ERROR;
#if CONFIG_MULTITHREAD
  vp8_decoder_remove_threads(pbi);
#endif

  /* decoder instance for single thread mode */
  remove_decompressor(pbi);
  fb->pbi[0] = NULL;
  return VPX_CODEC_OK;
}

int vp8dx_get_quantizer(const VP8D_COMP *pbi) {
  return pbi->common.base_qindex;
}
