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75 lines
2.2 KiB
75 lines
2.2 KiB
3 months ago
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/*
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* FFv1 codec
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*
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* Copyright (c) 2024 Lynne <dev@lynne.ee>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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struct SliceContext {
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RangeCoder c;
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#ifdef GOLOMB
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PutBitContext pb; /* 8*8 bytes */
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#endif
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ivec2 slice_dim;
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ivec2 slice_pos;
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ivec2 slice_rct_coef;
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uint hdr_len; // only used for golomb
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int slice_coding_mode;
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};
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/* -1, { -1, 0 } */
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int predict(int L, ivec2 top)
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{
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return mid_pred(L, L + top[1] - top[0], top[1]);
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}
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/* { -2, -1 }, { -1, 0, 1 }, 0 */
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int get_context(VTYPE2 cur_l, VTYPE3 top_l, TYPE top2, uint8_t quant_table_idx)
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{
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const int LT = top_l[0]; /* -1 */
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const int T = top_l[1]; /* 0 */
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const int RT = top_l[2]; /* 1 */
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const int L = cur_l[1]; /* -1 */
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int base = quant_table[quant_table_idx][0][(L - LT) & MAX_QUANT_TABLE_MASK] +
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quant_table[quant_table_idx][1][(LT - T) & MAX_QUANT_TABLE_MASK] +
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quant_table[quant_table_idx][2][(T - RT) & MAX_QUANT_TABLE_MASK];
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if ((quant_table[quant_table_idx][3][127] == 0) &&
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(quant_table[quant_table_idx][4][127] == 0))
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return base;
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const int TT = top2; /* -2 */
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const int LL = cur_l[0]; /* -2 */
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return base +
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quant_table[quant_table_idx][3][(LL - L) & MAX_QUANT_TABLE_MASK] +
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quant_table[quant_table_idx][4][(TT - T) & MAX_QUANT_TABLE_MASK];
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}
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const uint32_t log2_run[41] = {
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0, 0, 0, 0, 1, 1, 1, 1,
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2, 2, 2, 2, 3, 3, 3, 3,
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4, 4, 5, 5, 6, 6, 7, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23,
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24,
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};
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