diff options
Diffstat (limited to 'media/libvpx/libvpx/vp8/decoder/decodemv.c')
| -rw-r--r-- | media/libvpx/libvpx/vp8/decoder/decodemv.c | 562 |
1 files changed, 562 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/decoder/decodemv.c b/media/libvpx/libvpx/vp8/decoder/decodemv.c new file mode 100644 index 0000000000..51817a2cb9 --- /dev/null +++ b/media/libvpx/libvpx/vp8/decoder/decodemv.c @@ -0,0 +1,562 @@ +/* + * 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 "decodemv.h" +#include "treereader.h" +#include "vp8/common/entropymv.h" +#include "vp8/common/entropymode.h" +#include "onyxd_int.h" +#include "vp8/common/findnearmv.h" + +static B_PREDICTION_MODE read_bmode(vp8_reader *bc, const vp8_prob *p) { + const int i = vp8_treed_read(bc, vp8_bmode_tree, p); + + return (B_PREDICTION_MODE)i; +} + +static MB_PREDICTION_MODE read_ymode(vp8_reader *bc, const vp8_prob *p) { + const int i = vp8_treed_read(bc, vp8_ymode_tree, p); + + return (MB_PREDICTION_MODE)i; +} + +static MB_PREDICTION_MODE read_kf_ymode(vp8_reader *bc, const vp8_prob *p) { + const int i = vp8_treed_read(bc, vp8_kf_ymode_tree, p); + + return (MB_PREDICTION_MODE)i; +} + +static MB_PREDICTION_MODE read_uv_mode(vp8_reader *bc, const vp8_prob *p) { + const int i = vp8_treed_read(bc, vp8_uv_mode_tree, p); + + return (MB_PREDICTION_MODE)i; +} + +static void read_kf_modes(VP8D_COMP *pbi, MODE_INFO *mi) { + vp8_reader *const bc = &pbi->mbc[8]; + const int mis = pbi->common.mode_info_stride; + + mi->mbmi.ref_frame = INTRA_FRAME; + mi->mbmi.mode = read_kf_ymode(bc, vp8_kf_ymode_prob); + + if (mi->mbmi.mode == B_PRED) { + int i = 0; + mi->mbmi.is_4x4 = 1; + + do { + const B_PREDICTION_MODE A = above_block_mode(mi, i, mis); + const B_PREDICTION_MODE L = left_block_mode(mi, i); + + mi->bmi[i].as_mode = read_bmode(bc, vp8_kf_bmode_prob[A][L]); + } while (++i < 16); + } + + mi->mbmi.uv_mode = read_uv_mode(bc, vp8_kf_uv_mode_prob); +} + +static int read_mvcomponent(vp8_reader *r, const MV_CONTEXT *mvc) { + const vp8_prob *const p = (const vp8_prob *)mvc; + int x = 0; + + if (vp8_read(r, p[mvpis_short])) { /* Large */ + int i = 0; + + do { + x += vp8_read(r, p[MVPbits + i]) << i; + } while (++i < 3); + + i = mvlong_width - 1; /* Skip bit 3, which is sometimes implicit */ + + do { + x += vp8_read(r, p[MVPbits + i]) << i; + } while (--i > 3); + + if (!(x & 0xFFF0) || vp8_read(r, p[MVPbits + 3])) x += 8; + } else { /* small */ + x = vp8_treed_read(r, vp8_small_mvtree, p + MVPshort); + } + + if (x && vp8_read(r, p[MVPsign])) x = -x; + + return x; +} + +static void read_mv(vp8_reader *r, MV *mv, const MV_CONTEXT *mvc) { + mv->row = (short)(read_mvcomponent(r, mvc) * 2); + mv->col = (short)(read_mvcomponent(r, ++mvc) * 2); +} + +static void read_mvcontexts(vp8_reader *bc, MV_CONTEXT *mvc) { + int i = 0; + + do { + const vp8_prob *up = vp8_mv_update_probs[i].prob; + vp8_prob *p = (vp8_prob *)(mvc + i); + vp8_prob *const pstop = p + MVPcount; + + do { + if (vp8_read(bc, *up++)) { + const vp8_prob x = (vp8_prob)vp8_read_literal(bc, 7); + + *p = x ? x << 1 : 1; + } + } while (++p < pstop); + } while (++i < 2); +} + +static const unsigned char mbsplit_fill_count[4] = { 8, 8, 4, 1 }; +static const unsigned char mbsplit_fill_offset[4][16] = { + { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, + { 0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15 }, + { 0, 1, 4, 5, 2, 3, 6, 7, 8, 9, 12, 13, 10, 11, 14, 15 }, + { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } +}; + +static void mb_mode_mv_init(VP8D_COMP *pbi) { + vp8_reader *const bc = &pbi->mbc[8]; + MV_CONTEXT *const mvc = pbi->common.fc.mvc; + +#if CONFIG_ERROR_CONCEALMENT + /* Default is that no macroblock is corrupt, therefore we initialize + * mvs_corrupt_from_mb to something very big, which we can be sure is + * outside the frame. */ + pbi->mvs_corrupt_from_mb = UINT_MAX; +#endif + /* Read the mb_no_coeff_skip flag */ + pbi->common.mb_no_coeff_skip = (int)vp8_read_bit(bc); + + pbi->prob_skip_false = 0; + if (pbi->common.mb_no_coeff_skip) { + pbi->prob_skip_false = (vp8_prob)vp8_read_literal(bc, 8); + } + + if (pbi->common.frame_type != KEY_FRAME) { + pbi->prob_intra = (vp8_prob)vp8_read_literal(bc, 8); + pbi->prob_last = (vp8_prob)vp8_read_literal(bc, 8); + pbi->prob_gf = (vp8_prob)vp8_read_literal(bc, 8); + + if (vp8_read_bit(bc)) { + int i = 0; + + do { + pbi->common.fc.ymode_prob[i] = (vp8_prob)vp8_read_literal(bc, 8); + } while (++i < 4); + } + + if (vp8_read_bit(bc)) { + int i = 0; + + do { + pbi->common.fc.uv_mode_prob[i] = (vp8_prob)vp8_read_literal(bc, 8); + } while (++i < 3); + } + + read_mvcontexts(bc, mvc); + } +} + +const vp8_prob vp8_sub_mv_ref_prob3[8][VP8_SUBMVREFS - 1] = { + { 147, 136, 18 }, /* SUBMVREF_NORMAL */ + { 223, 1, 34 }, /* SUBMVREF_LEFT_ABOVE_SAME */ + { 106, 145, 1 }, /* SUBMVREF_LEFT_ZED */ + { 208, 1, 1 }, /* SUBMVREF_LEFT_ABOVE_ZED */ + { 179, 121, 1 }, /* SUBMVREF_ABOVE_ZED */ + { 223, 1, 34 }, /* SUBMVREF_LEFT_ABOVE_SAME */ + { 179, 121, 1 }, /* SUBMVREF_ABOVE_ZED */ + { 208, 1, 1 } /* SUBMVREF_LEFT_ABOVE_ZED */ +}; + +static const vp8_prob *get_sub_mv_ref_prob(const uint32_t left, + const uint32_t above) { + int lez = (left == 0); + int aez = (above == 0); + int lea = (left == above); + const vp8_prob *prob; + + prob = vp8_sub_mv_ref_prob3[(aez << 2) | (lez << 1) | (lea)]; + + return prob; +} + +static void decode_split_mv(vp8_reader *const bc, MODE_INFO *mi, + const MODE_INFO *left_mb, const MODE_INFO *above_mb, + MB_MODE_INFO *mbmi, int_mv best_mv, + MV_CONTEXT *const mvc, int mb_to_left_edge, + int mb_to_right_edge, int mb_to_top_edge, + int mb_to_bottom_edge) { + int s; /* split configuration (16x8, 8x16, 8x8, 4x4) */ + /* number of partitions in the split configuration (see vp8_mbsplit_count) */ + int num_p; + int j = 0; + + s = 3; + num_p = 16; + if (vp8_read(bc, 110)) { + s = 2; + num_p = 4; + if (vp8_read(bc, 111)) { + s = vp8_read(bc, 150); + num_p = 2; + } + } + + do /* for each subset j */ + { + int_mv leftmv, abovemv; + int_mv blockmv; + int k; /* first block in subset j */ + + const vp8_prob *prob; + k = vp8_mbsplit_offset[s][j]; + + if (!(k & 3)) { + /* On L edge, get from MB to left of us */ + if (left_mb->mbmi.mode != SPLITMV) { + leftmv.as_int = left_mb->mbmi.mv.as_int; + } else { + leftmv.as_int = (left_mb->bmi + k + 4 - 1)->mv.as_int; + } + } else { + leftmv.as_int = (mi->bmi + k - 1)->mv.as_int; + } + + if (!(k >> 2)) { + /* On top edge, get from MB above us */ + if (above_mb->mbmi.mode != SPLITMV) { + abovemv.as_int = above_mb->mbmi.mv.as_int; + } else { + abovemv.as_int = (above_mb->bmi + k + 16 - 4)->mv.as_int; + } + } else { + abovemv.as_int = (mi->bmi + k - 4)->mv.as_int; + } + + prob = get_sub_mv_ref_prob(leftmv.as_int, abovemv.as_int); + + if (vp8_read(bc, prob[0])) { + if (vp8_read(bc, prob[1])) { + blockmv.as_int = 0; + if (vp8_read(bc, prob[2])) { + blockmv.as_mv.row = read_mvcomponent(bc, &mvc[0]) * 2; + blockmv.as_mv.row += best_mv.as_mv.row; + blockmv.as_mv.col = read_mvcomponent(bc, &mvc[1]) * 2; + blockmv.as_mv.col += best_mv.as_mv.col; + } + } else { + blockmv.as_int = abovemv.as_int; + } + } else { + blockmv.as_int = leftmv.as_int; + } + + mbmi->need_to_clamp_mvs |= + vp8_check_mv_bounds(&blockmv, mb_to_left_edge, mb_to_right_edge, + mb_to_top_edge, mb_to_bottom_edge); + + { + /* Fill (uniform) modes, mvs of jth subset. + Must do it here because ensuing subsets can + refer back to us via "left" or "above". */ + const unsigned char *fill_offset; + unsigned int fill_count = mbsplit_fill_count[s]; + + fill_offset = + &mbsplit_fill_offset[s][(unsigned char)j * mbsplit_fill_count[s]]; + + do { + mi->bmi[*fill_offset].mv.as_int = blockmv.as_int; + fill_offset++; + } while (--fill_count); + } + + } while (++j < num_p); + + mbmi->partitioning = s; +} + +static void read_mb_modes_mv(VP8D_COMP *pbi, MODE_INFO *mi, + MB_MODE_INFO *mbmi) { + vp8_reader *const bc = &pbi->mbc[8]; + mbmi->ref_frame = (MV_REFERENCE_FRAME)vp8_read(bc, pbi->prob_intra); + if (mbmi->ref_frame) { /* inter MB */ + enum { CNT_INTRA, CNT_NEAREST, CNT_NEAR, CNT_SPLITMV }; + int cnt[4]; + int *cntx = cnt; + int_mv near_mvs[4]; + int_mv *nmv = near_mvs; + const int mis = pbi->mb.mode_info_stride; + const MODE_INFO *above = mi - mis; + const MODE_INFO *left = mi - 1; + const MODE_INFO *aboveleft = above - 1; + int *ref_frame_sign_bias = pbi->common.ref_frame_sign_bias; + + mbmi->need_to_clamp_mvs = 0; + + if (vp8_read(bc, pbi->prob_last)) { + mbmi->ref_frame = + (MV_REFERENCE_FRAME)((int)(2 + vp8_read(bc, pbi->prob_gf))); + } + + /* Zero accumulators */ + nmv[0].as_int = nmv[1].as_int = nmv[2].as_int = 0; + cnt[0] = cnt[1] = cnt[2] = cnt[3] = 0; + + /* Process above */ + if (above->mbmi.ref_frame != INTRA_FRAME) { + if (above->mbmi.mv.as_int) { + (++nmv)->as_int = above->mbmi.mv.as_int; + mv_bias(ref_frame_sign_bias[above->mbmi.ref_frame], mbmi->ref_frame, + nmv, ref_frame_sign_bias); + ++cntx; + } + + *cntx += 2; + } + + /* Process left */ + if (left->mbmi.ref_frame != INTRA_FRAME) { + if (left->mbmi.mv.as_int) { + int_mv this_mv; + + this_mv.as_int = left->mbmi.mv.as_int; + mv_bias(ref_frame_sign_bias[left->mbmi.ref_frame], mbmi->ref_frame, + &this_mv, ref_frame_sign_bias); + + if (this_mv.as_int != nmv->as_int) { + (++nmv)->as_int = this_mv.as_int; + ++cntx; + } + + *cntx += 2; + } else { + cnt[CNT_INTRA] += 2; + } + } + + /* Process above left */ + if (aboveleft->mbmi.ref_frame != INTRA_FRAME) { + if (aboveleft->mbmi.mv.as_int) { + int_mv this_mv; + + this_mv.as_int = aboveleft->mbmi.mv.as_int; + mv_bias(ref_frame_sign_bias[aboveleft->mbmi.ref_frame], mbmi->ref_frame, + &this_mv, ref_frame_sign_bias); + + if (this_mv.as_int != nmv->as_int) { + (++nmv)->as_int = this_mv.as_int; + ++cntx; + } + + *cntx += 1; + } else { + cnt[CNT_INTRA] += 1; + } + } + + if (vp8_read(bc, vp8_mode_contexts[cnt[CNT_INTRA]][0])) { + /* If we have three distinct MV's ... */ + /* See if above-left MV can be merged with NEAREST */ + cnt[CNT_NEAREST] += ((cnt[CNT_SPLITMV] > 0) & + (nmv->as_int == near_mvs[CNT_NEAREST].as_int)); + + /* Swap near and nearest if necessary */ + if (cnt[CNT_NEAR] > cnt[CNT_NEAREST]) { + int tmp; + tmp = cnt[CNT_NEAREST]; + cnt[CNT_NEAREST] = cnt[CNT_NEAR]; + cnt[CNT_NEAR] = tmp; + tmp = near_mvs[CNT_NEAREST].as_int; + near_mvs[CNT_NEAREST].as_int = near_mvs[CNT_NEAR].as_int; + near_mvs[CNT_NEAR].as_int = tmp; + } + + if (vp8_read(bc, vp8_mode_contexts[cnt[CNT_NEAREST]][1])) { + if (vp8_read(bc, vp8_mode_contexts[cnt[CNT_NEAR]][2])) { + int mb_to_top_edge; + int mb_to_bottom_edge; + int mb_to_left_edge; + int mb_to_right_edge; + MV_CONTEXT *const mvc = pbi->common.fc.mvc; + int near_index; + + mb_to_top_edge = pbi->mb.mb_to_top_edge; + mb_to_bottom_edge = pbi->mb.mb_to_bottom_edge; + mb_to_top_edge -= LEFT_TOP_MARGIN; + mb_to_bottom_edge += RIGHT_BOTTOM_MARGIN; + mb_to_right_edge = pbi->mb.mb_to_right_edge; + mb_to_right_edge += RIGHT_BOTTOM_MARGIN; + mb_to_left_edge = pbi->mb.mb_to_left_edge; + mb_to_left_edge -= LEFT_TOP_MARGIN; + + /* Use near_mvs[0] to store the "best" MV */ + near_index = CNT_INTRA + (cnt[CNT_NEAREST] >= cnt[CNT_INTRA]); + + vp8_clamp_mv2(&near_mvs[near_index], &pbi->mb); + + cnt[CNT_SPLITMV] = + ((above->mbmi.mode == SPLITMV) + (left->mbmi.mode == SPLITMV)) * + 2 + + (aboveleft->mbmi.mode == SPLITMV); + + if (vp8_read(bc, vp8_mode_contexts[cnt[CNT_SPLITMV]][3])) { + decode_split_mv(bc, mi, left, above, mbmi, near_mvs[near_index], + mvc, mb_to_left_edge, mb_to_right_edge, + mb_to_top_edge, mb_to_bottom_edge); + mbmi->mv.as_int = mi->bmi[15].mv.as_int; + mbmi->mode = SPLITMV; + mbmi->is_4x4 = 1; + } else { + int_mv *const mbmi_mv = &mbmi->mv; + read_mv(bc, &mbmi_mv->as_mv, (const MV_CONTEXT *)mvc); + mbmi_mv->as_mv.row += near_mvs[near_index].as_mv.row; + mbmi_mv->as_mv.col += near_mvs[near_index].as_mv.col; + + /* Don't need to check this on NEARMV and NEARESTMV + * modes since those modes clamp the MV. The NEWMV mode + * does not, so signal to the prediction stage whether + * special handling may be required. + */ + mbmi->need_to_clamp_mvs = + vp8_check_mv_bounds(mbmi_mv, mb_to_left_edge, mb_to_right_edge, + mb_to_top_edge, mb_to_bottom_edge); + mbmi->mode = NEWMV; + } + } else { + mbmi->mode = NEARMV; + mbmi->mv.as_int = near_mvs[CNT_NEAR].as_int; + vp8_clamp_mv2(&mbmi->mv, &pbi->mb); + } + } else { + mbmi->mode = NEARESTMV; + mbmi->mv.as_int = near_mvs[CNT_NEAREST].as_int; + vp8_clamp_mv2(&mbmi->mv, &pbi->mb); + } + } else { + mbmi->mode = ZEROMV; + mbmi->mv.as_int = 0; + } + +#if CONFIG_ERROR_CONCEALMENT + if (pbi->ec_enabled && (mbmi->mode != SPLITMV)) { + mi->bmi[0].mv.as_int = mi->bmi[1].mv.as_int = mi->bmi[2].mv.as_int = + mi->bmi[3].mv.as_int = mi->bmi[4].mv.as_int = mi->bmi[5].mv.as_int = + mi->bmi[6].mv.as_int = mi->bmi[7].mv.as_int = + mi->bmi[8].mv.as_int = mi->bmi[9].mv.as_int = + mi->bmi[10].mv.as_int = mi->bmi[11].mv.as_int = + mi->bmi[12].mv.as_int = mi->bmi[13].mv.as_int = + mi->bmi[14].mv.as_int = mi->bmi[15].mv.as_int = + mbmi->mv.as_int; + } +#endif + } else { + /* required for left and above block mv */ + mbmi->mv.as_int = 0; + + /* MB is intra coded */ + if ((mbmi->mode = read_ymode(bc, pbi->common.fc.ymode_prob)) == B_PRED) { + int j = 0; + mbmi->is_4x4 = 1; + do { + mi->bmi[j].as_mode = read_bmode(bc, pbi->common.fc.bmode_prob); + } while (++j < 16); + } + + mbmi->uv_mode = read_uv_mode(bc, pbi->common.fc.uv_mode_prob); + } +} + +static void read_mb_features(vp8_reader *r, MB_MODE_INFO *mi, MACROBLOCKD *x) { + /* Is segmentation enabled */ + if (x->segmentation_enabled && x->update_mb_segmentation_map) { + /* If so then read the segment id. */ + if (vp8_read(r, x->mb_segment_tree_probs[0])) { + mi->segment_id = + (unsigned char)(2 + vp8_read(r, x->mb_segment_tree_probs[2])); + } else { + mi->segment_id = + (unsigned char)(vp8_read(r, x->mb_segment_tree_probs[1])); + } + } +} + +static void decode_mb_mode_mvs(VP8D_COMP *pbi, MODE_INFO *mi) { + /* Read the Macroblock segmentation map if it is being updated explicitly + * this frame (reset to 0 above by default) + * By default on a key frame reset all MBs to segment 0 + */ + if (pbi->mb.update_mb_segmentation_map) { + read_mb_features(&pbi->mbc[8], &mi->mbmi, &pbi->mb); + } else if (pbi->common.frame_type == KEY_FRAME) { + mi->mbmi.segment_id = 0; + } + + /* Read the macroblock coeff skip flag if this feature is in use, + * else default to 0 */ + if (pbi->common.mb_no_coeff_skip) { + mi->mbmi.mb_skip_coeff = vp8_read(&pbi->mbc[8], pbi->prob_skip_false); + } else { + mi->mbmi.mb_skip_coeff = 0; + } + + mi->mbmi.is_4x4 = 0; + if (pbi->common.frame_type == KEY_FRAME) { + read_kf_modes(pbi, mi); + } else { + read_mb_modes_mv(pbi, mi, &mi->mbmi); + } +} + +void vp8_decode_mode_mvs(VP8D_COMP *pbi) { + MODE_INFO *mi = pbi->common.mi; + int mb_row = -1; + int mb_to_right_edge_start; + + mb_mode_mv_init(pbi); + + pbi->mb.mb_to_top_edge = 0; + pbi->mb.mb_to_bottom_edge = ((pbi->common.mb_rows - 1) * 16) << 3; + mb_to_right_edge_start = ((pbi->common.mb_cols - 1) * 16) << 3; + + while (++mb_row < pbi->common.mb_rows) { + int mb_col = -1; + + pbi->mb.mb_to_left_edge = 0; + pbi->mb.mb_to_right_edge = mb_to_right_edge_start; + + while (++mb_col < pbi->common.mb_cols) { +#if CONFIG_ERROR_CONCEALMENT + int mb_num = mb_row * pbi->common.mb_cols + mb_col; +#endif + + decode_mb_mode_mvs(pbi, mi); + +#if CONFIG_ERROR_CONCEALMENT + /* look for corruption. set mvs_corrupt_from_mb to the current + * mb_num if the frame is corrupt from this macroblock. */ + if (vp8dx_bool_error(&pbi->mbc[8]) && + mb_num < (int)pbi->mvs_corrupt_from_mb) { + pbi->mvs_corrupt_from_mb = mb_num; + /* no need to continue since the partition is corrupt from + * here on. + */ + return; + } +#endif + + pbi->mb.mb_to_left_edge -= (16 << 3); + pbi->mb.mb_to_right_edge -= (16 << 3); + mi++; /* next macroblock */ + } + pbi->mb.mb_to_top_edge -= (16 << 3); + pbi->mb.mb_to_bottom_edge -= (16 << 3); + + mi++; /* skip left predictor each row */ + } +} |