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/* |
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* JPEG-LS common code |
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* Copyright (c) 2003 Michael Niedermayer |
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* Copyright (c) 2006 Konstantin Shishkov |
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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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/** |
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* @file |
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* JPEG-LS common code. |
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*/ |
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#include "internal.h" |
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#include "jpegls.h" |
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void ff_jpegls_init_state(JLSState *state) |
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{ |
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int i; |
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state->twonear = state->near * 2 + 1; |
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state->range = (state->maxval + state->twonear - 1) / state->twonear + 1; |
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// QBPP = ceil(log2(RANGE)) |
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✓✓ |
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for (state->qbpp = 0; (1 << state->qbpp) < state->range; state->qbpp++) |
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; |
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state->bpp = FFMAX(av_log2(state->maxval) + 1, 2); |
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state->limit = 2*(state->bpp + FFMAX(state->bpp, 8)) - state->qbpp; |
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✓✓ |
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for (i = 0; i < 367; i++) { |
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state->A[i] = FFMAX(state->range + 32 >> 6, 2); |
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state->N[i] = 1; |
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} |
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} |
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/** |
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* Custom value clipping function used in T1, T2, T3 calculation |
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*/ |
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static inline int iso_clip(int v, int vmin, int vmax) |
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{ |
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✓✗✗✓
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if (v > vmax || v < vmin) |
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return vmin; |
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else |
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return v; |
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} |
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void ff_jpegls_reset_coding_parameters(JLSState *s, int reset_all) |
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{ |
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const int basic_t1 = 3; |
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const int basic_t2 = 7; |
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const int basic_t3 = 21; |
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int factor; |
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✗✓✗✗
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if (s->maxval == 0 || reset_all) |
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s->maxval = (1 << s->bpp) - 1; |
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✓✗ |
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if (s->maxval >= 128) { |
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factor = FFMIN(s->maxval, 4095) + 128 >> 8; |
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✗✓✗✗
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if (s->T1 == 0 || reset_all) |
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s->T1 = iso_clip(factor * (basic_t1 - 2) + 2 + 3 * s->near, |
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s->near + 1, s->maxval); |
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✗✓✗✗
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if (s->T2 == 0 || reset_all) |
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s->T2 = iso_clip(factor * (basic_t2 - 3) + 3 + 5 * s->near, |
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s->T1, s->maxval); |
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✗✓✗✗
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if (s->T3 == 0 || reset_all) |
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s->T3 = iso_clip(factor * (basic_t3 - 4) + 4 + 7 * s->near, |
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s->T2, s->maxval); |
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} else { |
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factor = 256 / (s->maxval + 1); |
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if (s->T1 == 0 || reset_all) |
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s->T1 = iso_clip(FFMAX(2, basic_t1 / factor + 3 * s->near), |
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s->near + 1, s->maxval); |
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if (s->T2 == 0 || reset_all) |
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s->T2 = iso_clip(FFMAX(3, basic_t2 / factor + 5 * s->near), |
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s->T1, s->maxval); |
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if (s->T3 == 0 || reset_all) |
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s->T3 = iso_clip(FFMAX(4, basic_t3 / factor + 7 * s->near), |
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s->T2, s->maxval); |
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} |
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✗✓✗✗
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if (s->reset == 0 || reset_all) |
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s->reset = 64; |
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ff_dlog(NULL, "[JPEG-LS RESET] T=%i,%i,%i\n", s->T1, s->T2, s->T3); |
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} |