// This function encodes the reference frame
static void write_ref_frames(const VP9_COMMON *cm, const MACROBLOCKD *xd,
                             vpx_writer *w) {
  const MODE_INFO *const mi = xd->mi[0];
  const int is_compound = has_second_ref(mi);
  const int segment_id = mi->segment_id;

  // If segment level coding of this signal is disabled...
  // or the segment allows multiple reference frame options
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
    assert(!is_compound);
    assert(mi->ref_frame[0] ==
               get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME));
  } else {
    // does the feature use compound prediction or not
    // (if not specified at the frame/segment level)
    if (cm->reference_mode == REFERENCE_MODE_SELECT) {
      vpx_write(w, is_compound, vp9_get_reference_mode_prob(cm, xd));
    } else {
      assert(!is_compound == (cm->reference_mode == SINGLE_REFERENCE));
    }

    if (is_compound) {
      vpx_write(w, mi->ref_frame[0] == GOLDEN_FRAME,
                vp9_get_pred_prob_comp_ref_p(cm, xd));
    } else {
      const int bit0 = mi->ref_frame[0] != LAST_FRAME;
      vpx_write(w, bit0, vp9_get_pred_prob_single_ref_p1(cm, xd));
      if (bit0) {
        const int bit1 = mi->ref_frame[0] != GOLDEN_FRAME;
        vpx_write(w, bit1, vp9_get_pred_prob_single_ref_p2(cm, xd));
      }
    }
  }
}
Beispiel #2
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int vp9_get_qindex(const struct segmentation *seg, int segment_id,
                   int base_qindex) {
  if (segfeature_active(seg, segment_id, SEG_LVL_ALT_Q)) {
    const int data = get_segdata(seg, segment_id, SEG_LVL_ALT_Q);
    const int seg_qindex = seg->abs_delta == SEGMENT_ABSDATA ?
        data : base_qindex + data;
    return clamp(seg_qindex, 0, MAXQ);
  } else {
    return base_qindex;
  }
}
Beispiel #3
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static int read_is_inter_block(VP9_COMMON *const cm, MACROBLOCKD *const xd,
                               int segment_id, vpx_reader *r) {
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
    return get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME) != INTRA_FRAME;
  } else {
    const int ctx = vp9_get_intra_inter_context(xd);
    const int is_inter = vpx_read(r, cm->fc->intra_inter_prob[ctx]);
    FRAME_COUNTS *counts = xd->counts;
    if (counts)
      ++counts->intra_inter[ctx][is_inter];
    return is_inter;
  }
}
Beispiel #4
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// Read the referncence frame
static void read_ref_frames(VP9_COMMON *const cm, MACROBLOCKD *const xd,
                            vpx_reader *r,
                            int segment_id, MV_REFERENCE_FRAME ref_frame[2]) {
  FRAME_CONTEXT *const fc = cm->fc;
  FRAME_COUNTS *counts = xd->counts;

  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
    ref_frame[0] = (MV_REFERENCE_FRAME)get_segdata(&cm->seg, segment_id,
                                                   SEG_LVL_REF_FRAME);
    ref_frame[1] = NONE;
  } else {
    const REFERENCE_MODE mode = read_block_reference_mode(cm, xd, r);
    // FIXME(rbultje) I'm pretty sure this breaks segmentation ref frame coding
    if (mode == COMPOUND_REFERENCE) {
      const int idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
      const int ctx = vp9_get_pred_context_comp_ref_p(cm, xd);
      const int bit = vpx_read(r, fc->comp_ref_prob[ctx]);
      if (counts)
        ++counts->comp_ref[ctx][bit];
      ref_frame[idx] = cm->comp_fixed_ref;
      ref_frame[!idx] = cm->comp_var_ref[bit];
    } else if (mode == SINGLE_REFERENCE) {
      const int ctx0 = vp9_get_pred_context_single_ref_p1(xd);
      const int bit0 = vpx_read(r, fc->single_ref_prob[ctx0][0]);
      if (counts)
        ++counts->single_ref[ctx0][0][bit0];
      if (bit0) {
        const int ctx1 = vp9_get_pred_context_single_ref_p2(xd);
        const int bit1 = vpx_read(r, fc->single_ref_prob[ctx1][1]);
        if (counts)
          ++counts->single_ref[ctx1][1][bit1];
        ref_frame[0] = bit1 ? ALTREF_FRAME : GOLDEN_FRAME;
      } else {
        ref_frame[0] = LAST_FRAME;
      }

      ref_frame[1] = NONE;
    } else {
      assert(0 && "Invalid prediction mode.");
    }
  }
}
static void encode_segmentation(VP9_COMMON *cm, MACROBLOCKD *xd,
                                struct vpx_write_bit_buffer *wb) {
  int i, j;

  const struct segmentation *seg = &cm->seg;

  vpx_wb_write_bit(wb, seg->enabled);
  if (!seg->enabled)
    return;

  // Segmentation map
  vpx_wb_write_bit(wb, seg->update_map);
  if (seg->update_map) {
    // Select the coding strategy (temporal or spatial)
    vp9_choose_segmap_coding_method(cm, xd);
    // Write out probabilities used to decode unpredicted  macro-block segments
    for (i = 0; i < SEG_TREE_PROBS; i++) {
      const int prob = seg->tree_probs[i];
      const int update = prob != MAX_PROB;
      vpx_wb_write_bit(wb, update);
      if (update)
        vpx_wb_write_literal(wb, prob, 8);
    }

    // Write out the chosen coding method.
    vpx_wb_write_bit(wb, seg->temporal_update);
    if (seg->temporal_update) {
      for (i = 0; i < PREDICTION_PROBS; i++) {
        const int prob = seg->pred_probs[i];
        const int update = prob != MAX_PROB;
        vpx_wb_write_bit(wb, update);
        if (update)
          vpx_wb_write_literal(wb, prob, 8);
      }
    }
  }

  // Segmentation data
  vpx_wb_write_bit(wb, seg->update_data);
  if (seg->update_data) {
    vpx_wb_write_bit(wb, seg->abs_delta);

    for (i = 0; i < MAX_SEGMENTS; i++) {
      for (j = 0; j < SEG_LVL_MAX; j++) {
        const int active = segfeature_active(seg, i, j);
        vpx_wb_write_bit(wb, active);
        if (active) {
          const int data = get_segdata(seg, i, j);
          const int data_max = vp9_seg_feature_data_max(j);

          if (vp9_is_segfeature_signed(j)) {
            encode_unsigned_max(wb, abs(data), data_max);
            vpx_wb_write_bit(wb, data < 0);
          } else {
            encode_unsigned_max(wb, data, data_max);
          }
        }
      }
    }
  }
}