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/*
* FFv1 codec
*
* Copyright (c) 2024 Lynne <dev@lynne.ee>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
struct SliceContext {
RangeCoder c;
#ifdef GOLOMB
PutBitContext pb; /* 8*8 bytes */
#endif
ivec2 slice_dim;
ivec2 slice_pos;
ivec2 slice_rct_coef;
uint hdr_len; // only used for golomb
int slice_coding_mode;
};
/* -1, { -1, 0 } */
int predict(int L, ivec2 top)
{
return mid_pred(L, L + top[1] - top[0], top[1]);
}
/* { -2, -1 }, { -1, 0, 1 }, 0 */
int get_context(VTYPE2 cur_l, VTYPE3 top_l, TYPE top2, uint8_t quant_table_idx)
{
const int LT = top_l[0]; /* -1 */
const int T = top_l[1]; /* 0 */
const int RT = top_l[2]; /* 1 */
const int L = cur_l[1]; /* -1 */
int base = quant_table[quant_table_idx][0][(L - LT) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][1][(LT - T) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][2][(T - RT) & MAX_QUANT_TABLE_MASK];
if ((quant_table[quant_table_idx][3][127] == 0) &&
(quant_table[quant_table_idx][4][127] == 0))
return base;
const int TT = top2; /* -2 */
const int LL = cur_l[0]; /* -2 */
return base +
quant_table[quant_table_idx][3][(LL - L) & MAX_QUANT_TABLE_MASK] +
quant_table[quant_table_idx][4][(TT - T) & MAX_QUANT_TABLE_MASK];
}
const uint32_t log2_run[41] = {
0, 0, 0, 0, 1, 1, 1, 1,
2, 2, 2, 2, 3, 3, 3, 3,
4, 4, 5, 5, 6, 6, 7, 7,
8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24,
};
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