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bd01412313
Fixes a particular youtube video that I unfortunately can't share. Signed-off-by: Anton Khirnov <anton@khirnov.net>
353 lines
14 KiB
C
353 lines
14 KiB
C
/*
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* VP9 compatible video decoder
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*
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* Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
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* Copyright (C) 2013 Clément Bœsch <u pkh me>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "internal.h"
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#include "vp56.h"
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#include "vp9.h"
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#include "vp9data.h"
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static av_always_inline void clamp_mv(VP56mv *dst, const VP56mv *src,
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VP9Context *s)
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{
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dst->x = av_clip(src->x, s->min_mv.x, s->max_mv.x);
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dst->y = av_clip(src->y, s->min_mv.y, s->max_mv.y);
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}
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static void find_ref_mvs(VP9Context *s,
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VP56mv *pmv, int ref, int z, int idx, int sb)
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{
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static const int8_t mv_ref_blk_off[N_BS_SIZES][8][2] = {
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[BS_64x64] = { { 3, -1 }, { -1, 3 }, { 4, -1 }, { -1, 4 },
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{ -1, -1 }, { 0, -1 }, { -1, 0 }, { 6, -1 } },
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[BS_64x32] = { { 0, -1 }, { -1, 0 }, { 4, -1 }, { -1, 2 },
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{ -1, -1 }, { 0, -3 }, { -3, 0 }, { 2, -1 } },
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[BS_32x64] = { { -1, 0 }, { 0, -1 }, { -1, 4 }, { 2, -1 },
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{ -1, -1 }, { -3, 0 }, { 0, -3 }, { -1, 2 } },
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[BS_32x32] = { { 1, -1 }, { -1, 1 }, { 2, -1 }, { -1, 2 },
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{ -1, -1 }, { 0, -3 }, { -3, 0 }, { -3, -3 } },
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[BS_32x16] = { { 0, -1 }, { -1, 0 }, { 2, -1 }, { -1, -1 },
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{ -1, 1 }, { 0, -3 }, { -3, 0 }, { -3, -3 } },
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[BS_16x32] = { { -1, 0 }, { 0, -1 }, { -1, 2 }, { -1, -1 },
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{ 1, -1 }, { -3, 0 }, { 0, -3 }, { -3, -3 } },
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[BS_16x16] = { { 0, -1 }, { -1, 0 }, { 1, -1 }, { -1, 1 },
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{ -1, -1 }, { 0, -3 }, { -3, 0 }, { -3, -3 } },
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[BS_16x8] = { { 0, -1 }, { -1, 0 }, { 1, -1 }, { -1, -1 },
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{ 0, -2 }, { -2, 0 }, { -2, -1 }, { -1, -2 } },
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[BS_8x16] = { { -1, 0 }, { 0, -1 }, { -1, 1 }, { -1, -1 },
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{ -2, 0 }, { 0, -2 }, { -1, -2 }, { -2, -1 } },
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[BS_8x8] = { { 0, -1 }, { -1, 0 }, { -1, -1 }, { 0, -2 },
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{ -2, 0 }, { -1, -2 }, { -2, -1 }, { -2, -2 } },
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[BS_8x4] = { { 0, -1 }, { -1, 0 }, { -1, -1 }, { 0, -2 },
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{ -2, 0 }, { -1, -2 }, { -2, -1 }, { -2, -2 } },
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[BS_4x8] = { { 0, -1 }, { -1, 0 }, { -1, -1 }, { 0, -2 },
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{ -2, 0 }, { -1, -2 }, { -2, -1 }, { -2, -2 } },
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[BS_4x4] = { { 0, -1 }, { -1, 0 }, { -1, -1 }, { 0, -2 },
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{ -2, 0 }, { -1, -2 }, { -2, -1 }, { -2, -2 } },
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};
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VP9Block *const b = &s->b;
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int row = b->row, col = b->col, row7 = b->row7;
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const int8_t (*p)[2] = mv_ref_blk_off[b->bs];
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#define INVALID_MV 0x80008000U
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uint32_t mem = INVALID_MV;
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int i;
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#define RETURN_DIRECT_MV(mv) \
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do { \
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uint32_t m = AV_RN32A(&mv); \
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if (!idx) { \
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AV_WN32A(pmv, m); \
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return; \
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} else if (mem == INVALID_MV) { \
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mem = m; \
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} else if (m != mem) { \
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AV_WN32A(pmv, m); \
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return; \
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} \
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} while (0)
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if (sb >= 0) {
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if (sb == 2 || sb == 1) {
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RETURN_DIRECT_MV(b->mv[0][z]);
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} else if (sb == 3) {
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RETURN_DIRECT_MV(b->mv[2][z]);
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RETURN_DIRECT_MV(b->mv[1][z]);
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RETURN_DIRECT_MV(b->mv[0][z]);
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}
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#define RETURN_MV(mv) \
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do { \
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if (sb > 0) { \
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VP56mv tmp; \
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uint32_t m; \
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clamp_mv(&tmp, &mv, s); \
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m = AV_RN32A(&tmp); \
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if (!idx) { \
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AV_WN32A(pmv, m); \
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return; \
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} else if (mem == INVALID_MV) { \
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mem = m; \
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} else if (m != mem) { \
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AV_WN32A(pmv, m); \
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return; \
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} \
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} else { \
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uint32_t m = AV_RN32A(&mv); \
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if (!idx) { \
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clamp_mv(pmv, &mv, s); \
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return; \
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} else if (mem == INVALID_MV) { \
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mem = m; \
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} else if (m != mem) { \
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clamp_mv(pmv, &mv, s); \
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return; \
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} \
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} \
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} while (0)
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if (row > 0) {
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VP9MVRefPair *mv = &s->mv[0][(row - 1) * s->sb_cols * 8 + col];
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if (mv->ref[0] == ref)
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RETURN_MV(s->above_mv_ctx[2 * col + (sb & 1)][0]);
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else if (mv->ref[1] == ref)
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RETURN_MV(s->above_mv_ctx[2 * col + (sb & 1)][1]);
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}
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if (col > s->tiling.tile_col_start) {
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VP9MVRefPair *mv = &s->mv[0][row * s->sb_cols * 8 + col - 1];
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if (mv->ref[0] == ref)
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RETURN_MV(s->left_mv_ctx[2 * row7 + (sb >> 1)][0]);
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else if (mv->ref[1] == ref)
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RETURN_MV(s->left_mv_ctx[2 * row7 + (sb >> 1)][1]);
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}
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i = 2;
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} else {
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i = 0;
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}
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// previously coded MVs in the neighborhood, using same reference frame
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for (; i < 8; i++) {
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int c = p[i][0] + col, r = p[i][1] + row;
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if (c >= s->tiling.tile_col_start && c < s->cols &&
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r >= 0 && r < s->rows) {
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VP9MVRefPair *mv = &s->mv[0][r * s->sb_cols * 8 + c];
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if (mv->ref[0] == ref)
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RETURN_MV(mv->mv[0]);
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else if (mv->ref[1] == ref)
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RETURN_MV(mv->mv[1]);
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}
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}
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// MV at this position in previous frame, using same reference frame
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if (s->use_last_frame_mvs) {
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VP9MVRefPair *mv = &s->mv[1][row * s->sb_cols * 8 + col];
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if (mv->ref[0] == ref)
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RETURN_MV(mv->mv[0]);
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else if (mv->ref[1] == ref)
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RETURN_MV(mv->mv[1]);
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}
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#define RETURN_SCALE_MV(mv, scale) \
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do { \
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if (scale) { \
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VP56mv mv_temp = { -mv.x, -mv.y }; \
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RETURN_MV(mv_temp); \
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} else { \
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RETURN_MV(mv); \
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} \
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} while (0)
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// previously coded MVs in the neighborhood, using different reference frame
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for (i = 0; i < 8; i++) {
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int c = p[i][0] + col, r = p[i][1] + row;
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if (c >= s->tiling.tile_col_start && c < s->cols &&
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r >= 0 && r < s->rows) {
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VP9MVRefPair *mv = &s->mv[0][r * s->sb_cols * 8 + c];
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if (mv->ref[0] != ref && mv->ref[0] >= 0)
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RETURN_SCALE_MV(mv->mv[0],
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s->signbias[mv->ref[0]] != s->signbias[ref]);
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if (mv->ref[1] != ref && mv->ref[1] >= 0 &&
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// BUG - libvpx has this condition regardless of whether
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// we used the first ref MV and pre-scaling
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AV_RN32A(&mv->mv[0]) != AV_RN32A(&mv->mv[1])) {
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RETURN_SCALE_MV(mv->mv[1],
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s->signbias[mv->ref[1]] != s->signbias[ref]);
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}
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}
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}
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// MV at this position in previous frame, using different reference frame
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if (s->use_last_frame_mvs) {
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VP9MVRefPair *mv = &s->mv[1][row * s->sb_cols * 8 + col];
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if (mv->ref[0] != ref && mv->ref[0] >= 0)
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RETURN_SCALE_MV(mv->mv[0],
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s->signbias[mv->ref[0]] != s->signbias[ref]);
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if (mv->ref[1] != ref && mv->ref[1] >= 0 &&
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// BUG - libvpx has this condition regardless of whether
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// we used the first ref MV and pre-scaling
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AV_RN32A(&mv->mv[0]) != AV_RN32A(&mv->mv[1])) {
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RETURN_SCALE_MV(mv->mv[1],
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s->signbias[mv->ref[1]] != s->signbias[ref]);
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}
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}
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AV_ZERO32(pmv);
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#undef INVALID_MV
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#undef RETURN_MV
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#undef RETURN_SCALE_MV
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}
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static av_always_inline int read_mv_component(VP9Context *s, int idx, int hp)
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{
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int bit, sign = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].sign);
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int n, c = vp8_rac_get_tree(&s->c, ff_vp9_mv_class_tree,
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s->prob.p.mv_comp[idx].classes);
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s->counts.mv_comp[idx].sign[sign]++;
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s->counts.mv_comp[idx].classes[c]++;
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if (c) {
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int m;
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for (n = 0, m = 0; m < c; m++) {
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bit = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].bits[m]);
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n |= bit << m;
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s->counts.mv_comp[idx].bits[m][bit]++;
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}
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n <<= 3;
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bit = vp8_rac_get_tree(&s->c, ff_vp9_mv_fp_tree,
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s->prob.p.mv_comp[idx].fp);
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n |= bit << 1;
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s->counts.mv_comp[idx].fp[bit]++;
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if (hp) {
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bit = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].hp);
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s->counts.mv_comp[idx].hp[bit]++;
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n |= bit;
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} else {
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n |= 1;
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// bug in libvpx - we count for bw entropy purposes even if the
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// bit wasn't coded
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s->counts.mv_comp[idx].hp[1]++;
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}
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n += 8 << c;
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} else {
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n = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].class0);
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s->counts.mv_comp[idx].class0[n]++;
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bit = vp8_rac_get_tree(&s->c, ff_vp9_mv_fp_tree,
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s->prob.p.mv_comp[idx].class0_fp[n]);
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s->counts.mv_comp[idx].class0_fp[n][bit]++;
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n = (n << 3) | (bit << 1);
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if (hp) {
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bit = vp56_rac_get_prob(&s->c, s->prob.p.mv_comp[idx].class0_hp);
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s->counts.mv_comp[idx].class0_hp[bit]++;
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n |= bit;
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} else {
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n |= 1;
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// bug in libvpx - we count for bw entropy purposes even if the
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// bit wasn't coded
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s->counts.mv_comp[idx].class0_hp[1]++;
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}
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}
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return sign ? -(n + 1) : (n + 1);
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}
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void ff_vp9_fill_mv(VP9Context *s, VP56mv *mv, int mode, int sb)
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{
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VP9Block *const b = &s->b;
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if (mode == ZEROMV) {
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memset(mv, 0, sizeof(*mv) * 2);
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} else {
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int hp;
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// FIXME cache this value and reuse for other subblocks
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find_ref_mvs(s, &mv[0], b->ref[0], 0, mode == NEARMV,
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mode == NEWMV ? -1 : sb);
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// FIXME maybe move this code into find_ref_mvs()
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if ((mode == NEWMV || sb == -1) &&
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!(hp = s->highprecisionmvs &&
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abs(mv[0].x) < 64 && abs(mv[0].y) < 64)) {
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if (mv[0].y & 1) {
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if (mv[0].y < 0)
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mv[0].y++;
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else
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mv[0].y--;
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}
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if (mv[0].x & 1) {
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if (mv[0].x < 0)
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mv[0].x++;
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else
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mv[0].x--;
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}
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}
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if (mode == NEWMV) {
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enum MVJoint j = vp8_rac_get_tree(&s->c, ff_vp9_mv_joint_tree,
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s->prob.p.mv_joint);
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s->counts.mv_joint[j]++;
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if (j >= MV_JOINT_V)
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mv[0].y += read_mv_component(s, 0, hp);
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if (j & 1)
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mv[0].x += read_mv_component(s, 1, hp);
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}
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if (b->comp) {
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// FIXME cache this value and reuse for other subblocks
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find_ref_mvs(s, &mv[1], b->ref[1], 1, mode == NEARMV,
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mode == NEWMV ? -1 : sb);
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if ((mode == NEWMV || sb == -1) &&
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!(hp = s->highprecisionmvs &&
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abs(mv[1].x) < 64 && abs(mv[1].y) < 64)) {
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if (mv[1].y & 1) {
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if (mv[1].y < 0)
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mv[1].y++;
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else
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mv[1].y--;
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}
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if (mv[1].x & 1) {
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if (mv[1].x < 0)
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mv[1].x++;
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else
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mv[1].x--;
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}
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}
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if (mode == NEWMV) {
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enum MVJoint j = vp8_rac_get_tree(&s->c, ff_vp9_mv_joint_tree,
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s->prob.p.mv_joint);
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s->counts.mv_joint[j]++;
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if (j >= MV_JOINT_V)
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mv[1].y += read_mv_component(s, 0, hp);
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if (j & 1)
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mv[1].x += read_mv_component(s, 1, hp);
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}
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}
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}
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}
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