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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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#ifndef AVCODEC_JPEGLS_H |
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#define AVCODEC_JPEGLS_H |
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#include "libavutil/common.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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#undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */ |
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typedef struct JLSState { |
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int T1, T2, T3; |
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int A[367], B[367], C[365], N[367]; |
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int limit, reset, bpp, qbpp, maxval, range; |
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int near, twonear; |
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int run_index[4]; |
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} JLSState; |
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/** |
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* Calculate initial JPEG-LS parameters |
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*/ |
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void ff_jpegls_init_state(JLSState *state); |
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/** |
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* Calculate quantized gradient value, used for context determination |
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*/ |
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261946935 |
static inline int ff_jpegls_quantize(JLSState *s, int v) |
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{ |
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✓✓ |
261946935 |
if (v == 0) |
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22609799 |
return 0; |
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✓✓ |
239337136 |
if (v < 0) { |
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✓✓ |
110161910 |
if (v <= -s->T3) |
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20088936 |
return -4; |
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✓✓ |
90072974 |
if (v <= -s->T2) |
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42203615 |
return -3; |
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✓✓ |
47869359 |
if (v <= -s->T1) |
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24863312 |
return -2; |
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✓✗ |
23006047 |
if (v < -s->near) |
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23006047 |
return -1; |
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return 0; |
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} else { |
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✗✓ |
129175226 |
if (v <= s->near) |
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return 0; |
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✓✓ |
129175226 |
if (v < s->T1) |
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24267848 |
return 1; |
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✓✓ |
104907378 |
if (v < s->T2) |
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34074282 |
return 2; |
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✓✓ |
70833096 |
if (v < s->T3) |
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52267563 |
return 3; |
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18565533 |
return 4; |
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} |
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} |
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/** |
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* Calculate JPEG-LS codec values |
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*/ |
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void ff_jpegls_reset_coding_parameters(JLSState *s, int reset_all); |
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88349902 |
static inline void ff_jpegls_downscale_state(JLSState *state, int Q) |
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{ |
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✓✓ |
88349902 |
if (state->N[Q] == state->reset) { |
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2597000 |
state->A[Q] >>= 1; |
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2597000 |
state->B[Q] >>= 1; |
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2597000 |
state->N[Q] >>= 1; |
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} |
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88349902 |
state->N[Q]++; |
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88349902 |
} |
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87315645 |
static inline int ff_jpegls_update_state_regular(JLSState *state, |
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int Q, int err) |
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{ |
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87315645 |
if(FFABS(err) > 0xFFFF) |
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return -0x10000; |
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87315645 |
state->A[Q] += FFABS(err); |
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87315645 |
err *= state->twonear; |
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87315645 |
state->B[Q] += err; |
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87315645 |
ff_jpegls_downscale_state(state, Q); |
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✓✓ |
87315645 |
if (state->B[Q] <= -state->N[Q]) { |
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6507442 |
state->B[Q] = FFMAX(state->B[Q] + state->N[Q], 1 - state->N[Q]); |
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✓✓ |
6507442 |
if (state->C[Q] > -128) |
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6494287 |
state->C[Q]--; |
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✓✓ |
80808203 |
} else if (state->B[Q] > 0) { |
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6741036 |
state->B[Q] = FFMIN(state->B[Q] - state->N[Q], 0); |
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✓✓ |
6741036 |
if (state->C[Q] < 127) |
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6740978 |
state->C[Q]++; |
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} |
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87315645 |
return err; |
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} |
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#define R(a, i) (bits == 8 ? ((uint8_t *)(a))[i] : ((uint16_t *)(a))[i]) |
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#define W(a, i, v) (bits == 8 ? (((uint8_t *)(a))[i] = v) : (((uint16_t *)(a))[i] = v)) |
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#endif /* AVCODEC_JPEGLS_H */ |