diff options
Diffstat (limited to 'media/libvpx/libvpx/vp9/common/vp9_pred_common.c')
| -rw-r--r-- | media/libvpx/libvpx/vp9/common/vp9_pred_common.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp9/common/vp9_pred_common.c b/media/libvpx/libvpx/vp9/common/vp9_pred_common.c new file mode 100644 index 0000000000..375cb4d76c --- /dev/null +++ b/media/libvpx/libvpx/vp9/common/vp9_pred_common.c @@ -0,0 +1,316 @@ + +/* + * Copyright (c) 2012 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 "vp9/common/vp9_common.h" +#include "vp9/common/vp9_pred_common.h" +#include "vp9/common/vp9_seg_common.h" + +int vp9_compound_reference_allowed(const VP9_COMMON *cm) { + int i; + for (i = 1; i < REFS_PER_FRAME; ++i) + if (cm->ref_frame_sign_bias[i + 1] != cm->ref_frame_sign_bias[1]) return 1; + + return 0; +} + +void vp9_setup_compound_reference_mode(VP9_COMMON *cm) { + if (cm->ref_frame_sign_bias[LAST_FRAME] == + cm->ref_frame_sign_bias[GOLDEN_FRAME]) { + cm->comp_fixed_ref = ALTREF_FRAME; + cm->comp_var_ref[0] = LAST_FRAME; + cm->comp_var_ref[1] = GOLDEN_FRAME; + } else if (cm->ref_frame_sign_bias[LAST_FRAME] == + cm->ref_frame_sign_bias[ALTREF_FRAME]) { + cm->comp_fixed_ref = GOLDEN_FRAME; + cm->comp_var_ref[0] = LAST_FRAME; + cm->comp_var_ref[1] = ALTREF_FRAME; + } else { + cm->comp_fixed_ref = LAST_FRAME; + cm->comp_var_ref[0] = GOLDEN_FRAME; + cm->comp_var_ref[1] = ALTREF_FRAME; + } +} + +int vp9_get_reference_mode_context(const VP9_COMMON *cm, + const MACROBLOCKD *xd) { + int ctx; + const MODE_INFO *const above_mi = xd->above_mi; + const MODE_INFO *const left_mi = xd->left_mi; + const int has_above = !!above_mi; + const int has_left = !!left_mi; + // Note: + // The mode info data structure has a one element border above and to the + // left of the entries corresponding to real macroblocks. + // The prediction flags in these dummy entries are initialized to 0. + if (has_above && has_left) { // both edges available + if (!has_second_ref(above_mi) && !has_second_ref(left_mi)) + // neither edge uses comp pred (0/1) + ctx = (above_mi->ref_frame[0] == cm->comp_fixed_ref) ^ + (left_mi->ref_frame[0] == cm->comp_fixed_ref); + else if (!has_second_ref(above_mi)) + // one of two edges uses comp pred (2/3) + ctx = 2 + (above_mi->ref_frame[0] == cm->comp_fixed_ref || + !is_inter_block(above_mi)); + else if (!has_second_ref(left_mi)) + // one of two edges uses comp pred (2/3) + ctx = 2 + (left_mi->ref_frame[0] == cm->comp_fixed_ref || + !is_inter_block(left_mi)); + else // both edges use comp pred (4) + ctx = 4; + } else if (has_above || has_left) { // one edge available + const MODE_INFO *edge_mi = has_above ? above_mi : left_mi; + + if (!has_second_ref(edge_mi)) + // edge does not use comp pred (0/1) + ctx = edge_mi->ref_frame[0] == cm->comp_fixed_ref; + else + // edge uses comp pred (3) + ctx = 3; + } else { // no edges available (1) + ctx = 1; + } + assert(ctx >= 0 && ctx < COMP_INTER_CONTEXTS); + return ctx; +} + +// Returns a context number for the given MB prediction signal +int vp9_get_pred_context_comp_ref_p(const VP9_COMMON *cm, + const MACROBLOCKD *xd) { + int pred_context; + const MODE_INFO *const above_mi = xd->above_mi; + const MODE_INFO *const left_mi = xd->left_mi; + const int above_in_image = !!above_mi; + const int left_in_image = !!left_mi; + + // Note: + // The mode info data structure has a one element border above and to the + // left of the entries corresponding to real macroblocks. + // The prediction flags in these dummy entries are initialized to 0. + const int fix_ref_idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref]; + const int var_ref_idx = !fix_ref_idx; + + if (above_in_image && left_in_image) { // both edges available + const int above_intra = !is_inter_block(above_mi); + const int left_intra = !is_inter_block(left_mi); + + if (above_intra && left_intra) { // intra/intra (2) + pred_context = 2; + } else if (above_intra || left_intra) { // intra/inter + const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi; + + if (!has_second_ref(edge_mi)) // single pred (1/3) + pred_context = 1 + 2 * (edge_mi->ref_frame[0] != cm->comp_var_ref[1]); + else // comp pred (1/3) + pred_context = + 1 + 2 * (edge_mi->ref_frame[var_ref_idx] != cm->comp_var_ref[1]); + } else { // inter/inter + const int l_sg = !has_second_ref(left_mi); + const int a_sg = !has_second_ref(above_mi); + const MV_REFERENCE_FRAME vrfa = + a_sg ? above_mi->ref_frame[0] : above_mi->ref_frame[var_ref_idx]; + const MV_REFERENCE_FRAME vrfl = + l_sg ? left_mi->ref_frame[0] : left_mi->ref_frame[var_ref_idx]; + + if (vrfa == vrfl && cm->comp_var_ref[1] == vrfa) { + pred_context = 0; + } else if (l_sg && a_sg) { // single/single + if ((vrfa == cm->comp_fixed_ref && vrfl == cm->comp_var_ref[0]) || + (vrfl == cm->comp_fixed_ref && vrfa == cm->comp_var_ref[0])) + pred_context = 4; + else if (vrfa == vrfl) + pred_context = 3; + else + pred_context = 1; + } else if (l_sg || a_sg) { // single/comp + const MV_REFERENCE_FRAME vrfc = l_sg ? vrfa : vrfl; + const MV_REFERENCE_FRAME rfs = a_sg ? vrfa : vrfl; + if (vrfc == cm->comp_var_ref[1] && rfs != cm->comp_var_ref[1]) + pred_context = 1; + else if (rfs == cm->comp_var_ref[1] && vrfc != cm->comp_var_ref[1]) + pred_context = 2; + else + pred_context = 4; + } else if (vrfa == vrfl) { // comp/comp + pred_context = 4; + } else { + pred_context = 2; + } + } + } else if (above_in_image || left_in_image) { // one edge available + const MODE_INFO *edge_mi = above_in_image ? above_mi : left_mi; + + if (!is_inter_block(edge_mi)) { + pred_context = 2; + } else { + if (has_second_ref(edge_mi)) + pred_context = + 4 * (edge_mi->ref_frame[var_ref_idx] != cm->comp_var_ref[1]); + else + pred_context = 3 * (edge_mi->ref_frame[0] != cm->comp_var_ref[1]); + } + } else { // no edges available (2) + pred_context = 2; + } + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + + return pred_context; +} + +int vp9_get_pred_context_single_ref_p1(const MACROBLOCKD *xd) { + int pred_context; + const MODE_INFO *const above_mi = xd->above_mi; + const MODE_INFO *const left_mi = xd->left_mi; + const int has_above = !!above_mi; + const int has_left = !!left_mi; + // Note: + // The mode info data structure has a one element border above and to the + // left of the entries corresponding to real macroblocks. + // The prediction flags in these dummy entries are initialized to 0. + if (has_above && has_left) { // both edges available + const int above_intra = !is_inter_block(above_mi); + const int left_intra = !is_inter_block(left_mi); + + if (above_intra && left_intra) { // intra/intra + pred_context = 2; + } else if (above_intra || left_intra) { // intra/inter or inter/intra + const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi; + if (!has_second_ref(edge_mi)) + pred_context = 4 * (edge_mi->ref_frame[0] == LAST_FRAME); + else + pred_context = 1 + (edge_mi->ref_frame[0] == LAST_FRAME || + edge_mi->ref_frame[1] == LAST_FRAME); + } else { // inter/inter + const int above_has_second = has_second_ref(above_mi); + const int left_has_second = has_second_ref(left_mi); + const MV_REFERENCE_FRAME above0 = above_mi->ref_frame[0]; + const MV_REFERENCE_FRAME above1 = above_mi->ref_frame[1]; + const MV_REFERENCE_FRAME left0 = left_mi->ref_frame[0]; + const MV_REFERENCE_FRAME left1 = left_mi->ref_frame[1]; + + if (above_has_second && left_has_second) { + pred_context = 1 + (above0 == LAST_FRAME || above1 == LAST_FRAME || + left0 == LAST_FRAME || left1 == LAST_FRAME); + } else if (above_has_second || left_has_second) { + const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0; + const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0; + const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1; + + if (rfs == LAST_FRAME) + pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME); + else + pred_context = (crf1 == LAST_FRAME || crf2 == LAST_FRAME); + } else { + pred_context = 2 * (above0 == LAST_FRAME) + 2 * (left0 == LAST_FRAME); + } + } + } else if (has_above || has_left) { // one edge available + const MODE_INFO *edge_mi = has_above ? above_mi : left_mi; + if (!is_inter_block(edge_mi)) { // intra + pred_context = 2; + } else { // inter + if (!has_second_ref(edge_mi)) + pred_context = 4 * (edge_mi->ref_frame[0] == LAST_FRAME); + else + pred_context = 1 + (edge_mi->ref_frame[0] == LAST_FRAME || + edge_mi->ref_frame[1] == LAST_FRAME); + } + } else { // no edges available + pred_context = 2; + } + + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + return pred_context; +} + +int vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) { + int pred_context; + const MODE_INFO *const above_mi = xd->above_mi; + const MODE_INFO *const left_mi = xd->left_mi; + const int has_above = !!above_mi; + const int has_left = !!left_mi; + + // Note: + // The mode info data structure has a one element border above and to the + // left of the entries corresponding to real macroblocks. + // The prediction flags in these dummy entries are initialized to 0. + if (has_above && has_left) { // both edges available + const int above_intra = !is_inter_block(above_mi); + const int left_intra = !is_inter_block(left_mi); + + if (above_intra && left_intra) { // intra/intra + pred_context = 2; + } else if (above_intra || left_intra) { // intra/inter or inter/intra + const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi; + if (!has_second_ref(edge_mi)) { + if (edge_mi->ref_frame[0] == LAST_FRAME) + pred_context = 3; + else + pred_context = 4 * (edge_mi->ref_frame[0] == GOLDEN_FRAME); + } else { + pred_context = 1 + 2 * (edge_mi->ref_frame[0] == GOLDEN_FRAME || + edge_mi->ref_frame[1] == GOLDEN_FRAME); + } + } else { // inter/inter + const int above_has_second = has_second_ref(above_mi); + const int left_has_second = has_second_ref(left_mi); + const MV_REFERENCE_FRAME above0 = above_mi->ref_frame[0]; + const MV_REFERENCE_FRAME above1 = above_mi->ref_frame[1]; + const MV_REFERENCE_FRAME left0 = left_mi->ref_frame[0]; + const MV_REFERENCE_FRAME left1 = left_mi->ref_frame[1]; + + if (above_has_second && left_has_second) { + if (above0 == left0 && above1 == left1) + pred_context = + 3 * (above0 == GOLDEN_FRAME || above1 == GOLDEN_FRAME || + left0 == GOLDEN_FRAME || left1 == GOLDEN_FRAME); + else + pred_context = 2; + } else if (above_has_second || left_has_second) { + const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0; + const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0; + const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1; + + if (rfs == GOLDEN_FRAME) + pred_context = 3 + (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME); + else if (rfs == ALTREF_FRAME) + pred_context = crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME; + else + pred_context = 1 + 2 * (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME); + } else { + if (above0 == LAST_FRAME && left0 == LAST_FRAME) { + pred_context = 3; + } else if (above0 == LAST_FRAME || left0 == LAST_FRAME) { + const MV_REFERENCE_FRAME edge0 = + (above0 == LAST_FRAME) ? left0 : above0; + pred_context = 4 * (edge0 == GOLDEN_FRAME); + } else { + pred_context = + 2 * (above0 == GOLDEN_FRAME) + 2 * (left0 == GOLDEN_FRAME); + } + } + } + } else if (has_above || has_left) { // one edge available + const MODE_INFO *edge_mi = has_above ? above_mi : left_mi; + + if (!is_inter_block(edge_mi) || + (edge_mi->ref_frame[0] == LAST_FRAME && !has_second_ref(edge_mi))) + pred_context = 2; + else if (!has_second_ref(edge_mi)) + pred_context = 4 * (edge_mi->ref_frame[0] == GOLDEN_FRAME); + else + pred_context = 3 * (edge_mi->ref_frame[0] == GOLDEN_FRAME || + edge_mi->ref_frame[1] == GOLDEN_FRAME); + } else { // no edges available (2) + pred_context = 2; + } + assert(pred_context >= 0 && pred_context < REF_CONTEXTS); + return pred_context; +} |