Beispiel #1
0
void av1_vaq_frame_setup(AV1_COMP *cpi) {
  AV1_COMMON *cm = &cpi->common;
  struct segmentation *seg = &cm->seg;
  int i;

  int resolution_change =
      cm->prev_frame && (cm->width != cm->prev_frame->width ||
                         cm->height != cm->prev_frame->height);
  if (resolution_change) {
    memset(cpi->segmentation_map, 0, cm->mi_rows * cm->mi_cols);
    av1_clearall_segfeatures(seg);
    aom_clear_system_state();
    av1_disable_segmentation(seg);
    return;
  }
  if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
      cpi->refresh_alt_ref_frame ||
      (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
    cpi->vaq_refresh = 1;

    av1_enable_segmentation(seg);
    av1_clearall_segfeatures(seg);

    aom_clear_system_state();

    for (i = 0; i < MAX_SEGMENTS; ++i) {
      int qindex_delta =
          av1_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
                                     rate_ratio[i], cm->bit_depth);

      // We don't allow qindex 0 in a segment if the base value is not 0.
      // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
      // Q delta is sometimes applied without going back around the rd loop.
      // This could lead to an illegal combination of partition size and q.
      if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
        qindex_delta = -cm->base_qindex + 1;
      }

      av1_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
      av1_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
    }
  }
}
Beispiel #2
0
void av1_vaq_frame_setup(AV1_COMP *cpi) {
  AV1_COMMON *cm = &cpi->common;
  struct segmentation *seg = &cm->seg;
  int i;

  if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
      cpi->refresh_alt_ref_frame ||
      (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
    cpi->vaq_refresh = 1;

    av1_enable_segmentation(seg);
    av1_clearall_segfeatures(seg);

    seg->abs_delta = SEGMENT_DELTADATA;

    aom_clear_system_state();

    for (i = 0; i < MAX_SEGMENTS; ++i) {
      int qindex_delta =
          av1_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
                                     rate_ratio[i], cm->bit_depth);

      // We don't allow qindex 0 in a segment if the base value is not 0.
      // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
      // Q delta is sometimes applied without going back around the rd loop.
      // This could lead to an illegal combination of partition size and q.
      if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
        qindex_delta = -cm->base_qindex + 1;
      }

      // No need to enable SEG_LVL_ALT_Q for this segment.
      if (rate_ratio[i] == 1.0) {
        continue;
      }

      av1_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
      av1_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
    }
  }
}
Beispiel #3
0
// Setup cyclic background refresh: set delta q and segmentation map.
void av1_cyclic_refresh_setup(AV1_COMP *const cpi) {
  AV1_COMMON *const cm = &cpi->common;
  const RATE_CONTROL *const rc = &cpi->rc;
  CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
  struct segmentation *const seg = &cm->seg;
  const int apply_cyclic_refresh = apply_cyclic_refresh_bitrate(cm, rc);
  if (cm->current_video_frame == 0) cr->low_content_avg = 0.0;
  // Don't apply refresh on key frame or enhancement layer frames.
  if (!apply_cyclic_refresh || cm->frame_type == KEY_FRAME) {
    // Set segmentation map to 0 and disable.
    unsigned char *const seg_map = cpi->segmentation_map;
    memset(seg_map, 0, cm->mi_rows * cm->mi_cols);
    av1_disable_segmentation(&cm->seg);
    if (cm->frame_type == KEY_FRAME) {
      memset(cr->last_coded_q_map, MAXQ,
             cm->mi_rows * cm->mi_cols * sizeof(*cr->last_coded_q_map));
      cr->sb_index = 0;
    }
    return;
  } else {
    int qindex_delta = 0;
    int qindex2;
    const double q = av1_convert_qindex_to_q(cm->base_qindex, cm->bit_depth);
    aom_clear_system_state();
    // Set rate threshold to some multiple (set to 2 for now) of the target
    // rate (target is given by sb64_target_rate and scaled by 256).
    cr->thresh_rate_sb = ((int64_t)(rc->sb64_target_rate) << 8) << 2;
    // Distortion threshold, quadratic in Q, scale factor to be adjusted.
    // q will not exceed 457, so (q * q) is within 32bit; see:
    // av1_convert_qindex_to_q(), av1_ac_quant(), ac_qlookup*[].
    cr->thresh_dist_sb = ((int64_t)(q * q)) << 2;

    // Set up segmentation.
    // Clear down the segment map.
    av1_enable_segmentation(&cm->seg);
    av1_clearall_segfeatures(seg);
    // Select delta coding method.
    seg->abs_delta = SEGMENT_DELTADATA;

    // Note: setting temporal_update has no effect, as the seg-map coding method
    // (temporal or spatial) is determined in
    // av1_choose_segmap_coding_method(),
    // based on the coding cost of each method. For error_resilient mode on the
    // last_frame_seg_map is set to 0, so if temporal coding is used, it is
    // relative to 0 previous map.
    // seg->temporal_update = 0;

    // Segment BASE "Q" feature is disabled so it defaults to the baseline Q.
    av1_disable_segfeature(seg, CR_SEGMENT_ID_BASE, SEG_LVL_ALT_Q);
    // Use segment BOOST1 for in-frame Q adjustment.
    av1_enable_segfeature(seg, CR_SEGMENT_ID_BOOST1, SEG_LVL_ALT_Q);
    // Use segment BOOST2 for more aggressive in-frame Q adjustment.
    av1_enable_segfeature(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q);

    // Set the q delta for segment BOOST1.
    qindex_delta = compute_deltaq(cpi, cm->base_qindex, cr->rate_ratio_qdelta);
    cr->qindex_delta[1] = qindex_delta;

    // Compute rd-mult for segment BOOST1.
    qindex2 = clamp(cm->base_qindex + cm->y_dc_delta_q + qindex_delta, 0, MAXQ);

    cr->rdmult = av1_compute_rd_mult(cpi, qindex2);

    av1_set_segdata(seg, CR_SEGMENT_ID_BOOST1, SEG_LVL_ALT_Q, qindex_delta);

    // Set a more aggressive (higher) q delta for segment BOOST2.
    qindex_delta = compute_deltaq(
        cpi, cm->base_qindex,
        AOMMIN(CR_MAX_RATE_TARGET_RATIO,
               0.1 * cr->rate_boost_fac * cr->rate_ratio_qdelta));
    cr->qindex_delta[2] = qindex_delta;
    av1_set_segdata(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q, qindex_delta);

    // Update the segmentation and refresh map.
    cyclic_refresh_update_map(cpi);
  }
}