mirror of https://github.com/FFmpeg/FFmpeg.git
Kostya Shishkov
13 years ago
parent
a87b17f328
commit
edf35d8342
8 changed files with 975 additions and 1 deletions
@ -0,0 +1,967 @@ |
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/*
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* Microsoft Screen 3 (aka Microsoft ATC Screen) decoder |
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* Copyright (c) 2012 Konstantin Shishkov |
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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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/**
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* @file |
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* Microsoft Screen 3 (aka Microsoft ATC Screen) decoder |
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*/ |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#define HEADER_SIZE 27 |
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#define MODEL2_SCALE 13 |
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#define MODEL_SCALE 15 |
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#define MODEL256_SEC_SCALE 9 |
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typedef struct Model2 { |
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int upd_val, till_rescale; |
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unsigned zero_freq, zero_weight; |
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unsigned total_freq, total_weight; |
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} Model2; |
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typedef struct Model { |
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int weights[16], freqs[16]; |
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int num_syms; |
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int tot_weight; |
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int upd_val, max_upd_val, till_rescale; |
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} Model; |
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typedef struct Model256 { |
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int weights[256], freqs[256]; |
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int tot_weight; |
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int secondary[68]; |
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int sec_size; |
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int upd_val, max_upd_val, till_rescale; |
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} Model256; |
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#define RAC_BOTTOM 0x01000000 |
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typedef struct RangeCoder { |
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const uint8_t *src, *src_end; |
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uint32_t range, low; |
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int got_error; |
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} RangeCoder; |
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enum BlockType { |
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FILL_BLOCK = 0, |
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IMAGE_BLOCK, |
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DCT_BLOCK, |
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HAAR_BLOCK, |
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SKIP_BLOCK |
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}; |
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typedef struct BlockTypeContext { |
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int last_type; |
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Model bt_model[5]; |
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} BlockTypeContext; |
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typedef struct FillBlockCoder { |
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int fill_val; |
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Model coef_model; |
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} FillBlockCoder; |
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typedef struct ImageBlockCoder { |
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Model256 esc_model, vec_entry_model; |
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Model vec_size_model; |
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Model vq_model[125]; |
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} ImageBlockCoder; |
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typedef struct DCTBlockCoder { |
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int *prev_dc; |
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int prev_dc_stride; |
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int prev_dc_height; |
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int quality; |
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uint16_t qmat[64]; |
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Model dc_model; |
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Model2 sign_model; |
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Model256 ac_model; |
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} DCTBlockCoder; |
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typedef struct HaarBlockCoder { |
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int quality, scale; |
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Model256 coef_model; |
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Model coef_hi_model; |
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} HaarBlockCoder; |
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typedef struct MSS3Context { |
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AVCodecContext *avctx; |
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AVFrame pic; |
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int got_error; |
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RangeCoder coder; |
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BlockTypeContext btype[3]; |
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FillBlockCoder fill_coder[3]; |
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ImageBlockCoder image_coder[3]; |
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DCTBlockCoder dct_coder[3]; |
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HaarBlockCoder haar_coder[3]; |
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int dctblock[64]; |
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int hblock[16 * 16]; |
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} MSS3Context; |
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static const uint8_t mss3_luma_quant[64] = { |
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16, 11, 10, 16, 24, 40, 51, 61, |
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12, 12, 14, 19, 26, 58, 60, 55, |
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14, 13, 16, 24, 40, 57, 69, 56, |
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14, 17, 22, 29, 51, 87, 80, 62, |
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18, 22, 37, 56, 68, 109, 103, 77, |
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24, 35, 55, 64, 81, 104, 113, 92, |
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49, 64, 78, 87, 103, 121, 120, 101, |
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72, 92, 95, 98, 112, 100, 103, 99 |
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}; |
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static const uint8_t mss3_chroma_quant[64] = { |
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17, 18, 24, 47, 99, 99, 99, 99, |
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18, 21, 26, 66, 99, 99, 99, 99, |
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24, 26, 56, 99, 99, 99, 99, 99, |
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47, 66, 99, 99, 99, 99, 99, 99, |
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99, 99, 99, 99, 99, 99, 99, 99, |
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99, 99, 99, 99, 99, 99, 99, 99, |
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99, 99, 99, 99, 99, 99, 99, 99, |
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99, 99, 99, 99, 99, 99, 99, 99 |
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}; |
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const uint8_t zigzag_scan[64] = { |
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0, 1, 8, 16, 9, 2, 3, 10, |
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17, 24, 32, 25, 18, 11, 4, 5, |
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12, 19, 26, 33, 40, 48, 41, 34, |
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27, 20, 13, 6, 7, 14, 21, 28, |
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35, 42, 49, 56, 57, 50, 43, 36, |
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29, 22, 15, 23, 30, 37, 44, 51, |
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58, 59, 52, 45, 38, 31, 39, 46, |
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53, 60, 61, 54, 47, 55, 62, 63 |
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}; |
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static void model2_reset(Model2 *m) |
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{ |
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m->zero_weight = 1; |
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m->total_weight = 2; |
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m->zero_freq = 0x1000; |
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m->total_freq = 0x2000; |
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m->upd_val = 4; |
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m->till_rescale = 4; |
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} |
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static void model2_update(Model2 *m, int bit) |
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{ |
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unsigned scale; |
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if (!bit) |
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m->zero_weight++; |
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m->till_rescale--; |
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if (m->till_rescale) |
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return; |
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m->total_weight += m->upd_val; |
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if (m->total_weight > 0x2000) { |
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m->total_weight = (m->total_weight + 1) >> 1; |
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m->zero_weight = (m->zero_weight + 1) >> 1; |
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if (m->total_weight == m->zero_weight) |
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m->total_weight = m->zero_weight + 1; |
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} |
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m->upd_val = m->upd_val * 5 >> 2; |
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if (m->upd_val > 64) |
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m->upd_val = 64; |
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scale = 0x80000000u / m->total_weight; |
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m->zero_freq = m->zero_weight * scale >> 18; |
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m->total_freq = m->total_weight * scale >> 18; |
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m->till_rescale = m->upd_val; |
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} |
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static void model_update(Model *m, int val) |
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{ |
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int i, sum = 0; |
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unsigned scale; |
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m->weights[val]++; |
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m->till_rescale--; |
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if (m->till_rescale) |
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return; |
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m->tot_weight += m->upd_val; |
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if (m->tot_weight > 0x8000) { |
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m->tot_weight = 0; |
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for (i = 0; i < m->num_syms; i++) { |
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m->weights[i] = (m->weights[i] + 1) >> 1; |
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m->tot_weight += m->weights[i]; |
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} |
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} |
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scale = 0x80000000u / m->tot_weight; |
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for (i = 0; i < m->num_syms; i++) { |
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m->freqs[i] = sum * scale >> 16; |
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sum += m->weights[i]; |
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} |
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m->upd_val = m->upd_val * 5 >> 2; |
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if (m->upd_val > m->max_upd_val) |
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m->upd_val = m->max_upd_val; |
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m->till_rescale = m->upd_val; |
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} |
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static void model_reset(Model *m) |
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{ |
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int i; |
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m->tot_weight = 0; |
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for (i = 0; i < m->num_syms - 1; i++) |
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m->weights[i] = 1; |
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m->weights[m->num_syms - 1] = 0; |
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m->upd_val = m->num_syms; |
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m->till_rescale = 1; |
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model_update(m, m->num_syms - 1); |
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m->till_rescale = |
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m->upd_val = (m->num_syms + 6) >> 1; |
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} |
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static av_cold void model_init(Model *m, int num_syms) |
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{ |
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m->num_syms = num_syms; |
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m->max_upd_val = 8 * num_syms + 48; |
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model_reset(m); |
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} |
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static void model256_update(Model256 *m, int val) |
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{ |
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int i, sum = 0; |
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unsigned scale; |
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int send, sidx = 1; |
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m->weights[val]++; |
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m->till_rescale--; |
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if (m->till_rescale) |
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return; |
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m->tot_weight += m->upd_val; |
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if (m->tot_weight > 0x8000) { |
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m->tot_weight = 0; |
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for (i = 0; i < 256; i++) { |
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m->weights[i] = (m->weights[i] + 1) >> 1; |
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m->tot_weight += m->weights[i]; |
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} |
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} |
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scale = 0x80000000u / m->tot_weight; |
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m->secondary[0] = 0; |
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for (i = 0; i < 256; i++) { |
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m->freqs[i] = sum * scale >> 16; |
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sum += m->weights[i]; |
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send = m->freqs[i] >> MODEL256_SEC_SCALE; |
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while (sidx <= send) |
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m->secondary[sidx++] = i - 1; |
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} |
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while (sidx < m->sec_size) |
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m->secondary[sidx++] = 255; |
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m->upd_val = m->upd_val * 5 >> 2; |
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if (m->upd_val > m->max_upd_val) |
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m->upd_val = m->max_upd_val; |
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m->till_rescale = m->upd_val; |
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} |
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static void model256_reset(Model256 *m) |
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{ |
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int i; |
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for (i = 0; i < 255; i++) |
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m->weights[i] = 1; |
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m->weights[255] = 0; |
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m->tot_weight = 0; |
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m->upd_val = 256; |
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m->till_rescale = 1; |
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model256_update(m, 255); |
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m->till_rescale = |
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m->upd_val = (256 + 6) >> 1; |
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} |
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static av_cold void model256_init(Model256 *m) |
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{ |
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m->max_upd_val = 8 * 256 + 48; |
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m->sec_size = (1 << 6) + 2; |
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model256_reset(m); |
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} |
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static void rac_init(RangeCoder *c, const uint8_t *src, int size) |
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{ |
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int i; |
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c->src = src; |
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c->src_end = src + size; |
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c->low = 0; |
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for (i = 0; i < FFMIN(size, 4); i++) |
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c->low = (c->low << 8) | *c->src++; |
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c->range = 0xFFFFFFFF; |
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c->got_error = 0; |
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} |
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static void rac_normalise(RangeCoder *c) |
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{ |
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for (;;) { |
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c->range <<= 8; |
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c->low <<= 8; |
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if (c->src < c->src_end) { |
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c->low |= *c->src++; |
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} else if (!c->low) { |
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c->got_error = 1; |
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return; |
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} |
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if (c->range >= RAC_BOTTOM) |
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return; |
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} |
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} |
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static int rac_get_bit(RangeCoder *c) |
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{ |
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int bit; |
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c->range >>= 1; |
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bit = (c->range <= c->low); |
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if (bit) |
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c->low -= c->range; |
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if (c->range < RAC_BOTTOM) |
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rac_normalise(c); |
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return bit; |
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} |
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static int rac_get_bits(RangeCoder *c, int nbits) |
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{ |
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int val; |
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c->range >>= nbits; |
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val = c->low / c->range; |
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c->low -= c->range * val; |
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if (c->range < RAC_BOTTOM) |
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rac_normalise(c); |
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return val; |
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} |
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static int rac_get_model2_sym(RangeCoder *c, Model2 *m) |
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{ |
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int bit, helper; |
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helper = m->zero_freq * (c->range >> MODEL2_SCALE); |
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bit = (c->low >= helper); |
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if (bit) { |
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c->low -= helper; |
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c->range -= helper; |
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} else { |
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c->range = helper; |
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} |
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if (c->range < RAC_BOTTOM) |
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rac_normalise(c); |
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model2_update(m, bit); |
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return bit; |
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} |
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static int rac_get_model_sym(RangeCoder *c, Model *m) |
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{ |
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int prob, prob2, helper, val; |
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int end, end2; |
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prob = 0; |
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prob2 = c->range; |
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c->range >>= MODEL_SCALE; |
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val = 0; |
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end = m->num_syms >> 1; |
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end2 = m->num_syms; |
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do { |
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helper = m->freqs[end] * c->range; |
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if (helper <= c->low) { |
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val = end; |
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prob = helper; |
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} else { |
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end2 = end; |
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prob2 = helper; |
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} |
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end = (end2 + val) >> 1; |
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} while (end != val); |
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c->low -= prob; |
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c->range = prob2 - prob; |
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if (c->range < RAC_BOTTOM) |
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rac_normalise(c); |
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model_update(m, val); |
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return val; |
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} |
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static int rac_get_model256_sym(RangeCoder *c, Model256 *m) |
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{ |
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int prob, prob2, helper, val; |
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int start, end; |
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int ssym; |
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prob2 = c->range; |
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c->range >>= MODEL_SCALE; |
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helper = c->low / c->range; |
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ssym = helper >> MODEL256_SEC_SCALE; |
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val = m->secondary[ssym]; |
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end = start = m->secondary[ssym + 1] + 1; |
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while (end > val + 1) { |
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ssym = (end + val) >> 1; |
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if (m->freqs[ssym] <= helper) { |
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end = start; |
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val = ssym; |
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} else { |
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end = (end + val) >> 1; |
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start = ssym; |
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} |
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} |
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prob = m->freqs[val] * c->range; |
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if (val != 255) |
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prob2 = m->freqs[val + 1] * c->range; |
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c->low -= prob; |
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c->range = prob2 - prob; |
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if (c->range < RAC_BOTTOM) |
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rac_normalise(c); |
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model256_update(m, val); |
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return val; |
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} |
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static int decode_block_type(RangeCoder *c, BlockTypeContext *bt) |
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{ |
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bt->last_type = rac_get_model_sym(c, &bt->bt_model[bt->last_type]); |
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return bt->last_type; |
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} |
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static int decode_coeff(RangeCoder *c, Model *m) |
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{ |
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int val, sign; |
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val = rac_get_model_sym(c, m); |
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if (val) { |
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sign = rac_get_bit(c); |
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if (val > 1) { |
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val--; |
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val = (1 << val) + rac_get_bits(c, val); |
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} |
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if (!sign) |
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val = -val; |
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} |
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return val; |
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} |
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static void decode_fill_block(RangeCoder *c, FillBlockCoder *fc, |
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uint8_t *dst, int stride, int block_size) |
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{ |
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int i; |
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fc->fill_val += decode_coeff(c, &fc->coef_model); |
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for (i = 0; i < block_size; i++, dst += stride) |
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memset(dst, fc->fill_val, block_size); |
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} |
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static void decode_image_block(RangeCoder *c, ImageBlockCoder *ic, |
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uint8_t *dst, int stride, int block_size) |
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{ |
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int i, j; |
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int vec_size; |
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int vec[4]; |
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int prev_line[16]; |
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int A, B, C; |
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vec_size = rac_get_model_sym(c, &ic->vec_size_model) + 2; |
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for (i = 0; i < vec_size; i++) |
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vec[i] = rac_get_model256_sym(c, &ic->vec_entry_model); |
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for (; i < 4; i++) |
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vec[i] = 0; |
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memset(prev_line, 0, sizeof(prev_line)); |
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for (j = 0; j < block_size; j++) { |
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A = 0; |
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B = 0; |
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for (i = 0; i < block_size; i++) { |
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C = B; |
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B = prev_line[i]; |
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A = rac_get_model_sym(c, &ic->vq_model[A + B * 5 + C * 25]); |
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prev_line[i] = A; |
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if (A < 4) |
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dst[i] = vec[A]; |
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else |
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dst[i] = rac_get_model256_sym(c, &ic->esc_model); |
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} |
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dst += stride; |
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} |
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} |
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static int decode_dct(RangeCoder *c, DCTBlockCoder *bc, int *block, |
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int bx, int by) |
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{ |
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int skip, val, sign, pos = 1, zz_pos, dc; |
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int blk_pos = bx + by * bc->prev_dc_stride; |
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memset(block, 0, sizeof(*block) * 64); |
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dc = decode_coeff(c, &bc->dc_model); |
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if (by) { |
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if (bx) { |
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int l, tl, t; |
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l = bc->prev_dc[blk_pos - 1]; |
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tl = bc->prev_dc[blk_pos - 1 - bc->prev_dc_stride]; |
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t = bc->prev_dc[blk_pos - bc->prev_dc_stride]; |
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if (FFABS(t - tl) <= FFABS(l - tl)) |
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dc += l; |
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else |
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dc += t; |
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} else { |
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dc += bc->prev_dc[blk_pos - bc->prev_dc_stride]; |
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} |
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} else if (bx) { |
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dc += bc->prev_dc[bx - 1]; |
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} |
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bc->prev_dc[blk_pos] = dc; |
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block[0] = dc * bc->qmat[0]; |
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while (pos < 64) { |
||||
val = rac_get_model256_sym(c, &bc->ac_model); |
||||
if (!val) |
||||
return 0; |
||||
if (val == 0xF0) { |
||||
pos += 16; |
||||
continue; |
||||
} |
||||
skip = val >> 4; |
||||
val = val & 0xF; |
||||
if (!val) |
||||
return -1; |
||||
pos += skip; |
||||
if (pos >= 64) |
||||
return -1; |
||||
|
||||
sign = rac_get_model2_sym(c, &bc->sign_model); |
||||
if (val > 1) { |
||||
val--; |
||||
val = (1 << val) + rac_get_bits(c, val); |
||||
} |
||||
if (!sign) |
||||
val = -val; |
||||
|
||||
zz_pos = zigzag_scan[pos]; |
||||
block[zz_pos] = val * bc->qmat[zz_pos]; |
||||
pos++; |
||||
} |
||||
|
||||
return pos == 64 ? 0 : -1; |
||||
} |
||||
|
||||
#define DCT_TEMPLATE(blk, step, SOP, shift) \ |
||||
const int t0 = -39409 * blk[7 * step] - 58980 * blk[1 * step]; \
|
||||
const int t1 = 39410 * blk[1 * step] - 58980 * blk[7 * step]; \
|
||||
const int t2 = -33410 * blk[5 * step] - 167963 * blk[3 * step]; \
|
||||
const int t3 = 33410 * blk[3 * step] - 167963 * blk[5 * step]; \
|
||||
const int t4 = blk[3 * step] + blk[7 * step]; \
|
||||
const int t5 = blk[1 * step] + blk[5 * step]; \
|
||||
const int t6 = 77062 * t4 + 51491 * t5; \
|
||||
const int t7 = 77062 * t5 - 51491 * t4; \
|
||||
const int t8 = 35470 * blk[2 * step] - 85623 * blk[6 * step]; \
|
||||
const int t9 = 35470 * blk[6 * step] + 85623 * blk[2 * step]; \
|
||||
const int tA = SOP(blk[0 * step] - blk[4 * step]); \
|
||||
const int tB = SOP(blk[0 * step] + blk[4 * step]); \
|
||||
\
|
||||
blk[0 * step] = ( t1 + t6 + t9 + tB) >> shift; \
|
||||
blk[1 * step] = ( t3 + t7 + t8 + tA) >> shift; \
|
||||
blk[2 * step] = ( t2 + t6 - t8 + tA) >> shift; \
|
||||
blk[3 * step] = ( t0 + t7 - t9 + tB) >> shift; \
|
||||
blk[4 * step] = (-(t0 + t7) - t9 + tB) >> shift; \
|
||||
blk[5 * step] = (-(t2 + t6) - t8 + tA) >> shift; \
|
||||
blk[6 * step] = (-(t3 + t7) + t8 + tA) >> shift; \
|
||||
blk[7 * step] = (-(t1 + t6) + t9 + tB) >> shift; \
|
||||
|
||||
#define SOP_ROW(a) ((a) << 16) + 0x2000 |
||||
#define SOP_COL(a) ((a + 32) << 16) |
||||
|
||||
static void dct_put(uint8_t *dst, int stride, int *block) |
||||
{ |
||||
int i, j; |
||||
int *ptr; |
||||
|
||||
ptr = block; |
||||
for (i = 0; i < 8; i++) { |
||||
DCT_TEMPLATE(ptr, 1, SOP_ROW, 13); |
||||
ptr += 8; |
||||
} |
||||
|
||||
ptr = block; |
||||
for (i = 0; i < 8; i++) { |
||||
DCT_TEMPLATE(ptr, 8, SOP_COL, 22); |
||||
ptr++; |
||||
} |
||||
|
||||
ptr = block; |
||||
for (j = 0; j < 8; j++) { |
||||
for (i = 0; i < 8; i++) |
||||
dst[i] = av_clip_uint8(ptr[i] + 128); |
||||
dst += stride; |
||||
ptr += 8; |
||||
} |
||||
} |
||||
|
||||
static void decode_dct_block(RangeCoder *c, DCTBlockCoder *bc, |
||||
uint8_t *dst, int stride, int block_size, |
||||
int *block, int mb_x, int mb_y) |
||||
{ |
||||
int i, j; |
||||
int bx, by; |
||||
int nblocks = block_size >> 3; |
||||
|
||||
bx = mb_x * nblocks; |
||||
by = mb_y * nblocks; |
||||
|
||||
for (j = 0; j < nblocks; j++) { |
||||
for (i = 0; i < nblocks; i++) { |
||||
if (decode_dct(c, bc, block, bx + i, by + j)) { |
||||
c->got_error = 1; |
||||
return; |
||||
} |
||||
dct_put(dst + i * 8, stride, block); |
||||
} |
||||
dst += 8 * stride; |
||||
} |
||||
} |
||||
|
||||
static void decode_haar_block(RangeCoder *c, HaarBlockCoder *hc, |
||||
uint8_t *dst, int stride, int block_size, |
||||
int *block) |
||||
{ |
||||
const int hsize = block_size >> 1; |
||||
int A, B, C, D, t1, t2, t3, t4; |
||||
int i, j; |
||||
|
||||
for (j = 0; j < block_size; j++) { |
||||
for (i = 0; i < block_size; i++) { |
||||
if (i < hsize && j < hsize) |
||||
block[i] = rac_get_model256_sym(c, &hc->coef_model); |
||||
else |
||||
block[i] = decode_coeff(c, &hc->coef_hi_model); |
||||
block[i] *= hc->scale; |
||||
} |
||||
block += block_size; |
||||
} |
||||
block -= block_size * block_size; |
||||
|
||||
for (j = 0; j < hsize; j++) { |
||||
for (i = 0; i < hsize; i++) { |
||||
A = block[i]; |
||||
B = block[i + hsize]; |
||||
C = block[i + hsize * block_size]; |
||||
D = block[i + hsize * block_size + hsize]; |
||||
|
||||
t1 = A - B; |
||||
t2 = C - D; |
||||
t3 = A + B; |
||||
t4 = C + D; |
||||
dst[i * 2] = av_clip_uint8(t1 - t2); |
||||
dst[i * 2 + stride] = av_clip_uint8(t1 + t2); |
||||
dst[i * 2 + 1] = av_clip_uint8(t3 - t4); |
||||
dst[i * 2 + 1 + stride] = av_clip_uint8(t3 + t4); |
||||
} |
||||
block += block_size; |
||||
dst += stride * 2; |
||||
} |
||||
} |
||||
|
||||
static void gen_quant_mat(uint16_t *qmat, const uint8_t *ref, float scale) |
||||
{ |
||||
int i; |
||||
|
||||
for (i = 0; i < 64; i++) |
||||
qmat[i] = (uint16_t)(ref[i] * scale + 50.0) / 100; |
||||
} |
||||
|
||||
static void reset_coders(MSS3Context *ctx, int quality) |
||||
{ |
||||
int i, j; |
||||
|
||||
for (i = 0; i < 3; i++) { |
||||
ctx->btype[i].last_type = SKIP_BLOCK; |
||||
for (j = 0; j < 5; j++) |
||||
model_reset(&ctx->btype[i].bt_model[j]); |
||||
ctx->fill_coder[i].fill_val = 0; |
||||
model_reset(&ctx->fill_coder[i].coef_model); |
||||
model256_reset(&ctx->image_coder[i].esc_model); |
||||
model256_reset(&ctx->image_coder[i].vec_entry_model); |
||||
model_reset(&ctx->image_coder[i].vec_size_model); |
||||
for (j = 0; j < 125; j++) |
||||
model_reset(&ctx->image_coder[i].vq_model[j]); |
||||
if (ctx->dct_coder[i].quality != quality) { |
||||
float scale; |
||||
ctx->dct_coder[i].quality = quality; |
||||
if (quality > 50) |
||||
scale = 200.0f - 2 * quality; |
||||
else |
||||
scale = 5000.0f / quality; |
||||
gen_quant_mat(ctx->dct_coder[i].qmat, |
||||
i ? mss3_chroma_quant : mss3_luma_quant, |
||||
scale); |
||||
} |
||||
memset(ctx->dct_coder[i].prev_dc, 0, |
||||
sizeof(*ctx->dct_coder[i].prev_dc) * |
||||
ctx->dct_coder[i].prev_dc_stride * |
||||
ctx->dct_coder[i].prev_dc_height); |
||||
model_reset(&ctx->dct_coder[i].dc_model); |
||||
model2_reset(&ctx->dct_coder[i].sign_model); |
||||
model256_reset(&ctx->dct_coder[i].ac_model); |
||||
if (ctx->haar_coder[i].quality != quality) { |
||||
ctx->haar_coder[i].quality = quality; |
||||
ctx->haar_coder[i].scale = 17 - 7 * quality / 50; |
||||
} |
||||
model_reset(&ctx->haar_coder[i].coef_hi_model); |
||||
model256_reset(&ctx->haar_coder[i].coef_model); |
||||
} |
||||
} |
||||
|
||||
static av_cold void init_coders(MSS3Context *ctx) |
||||
{ |
||||
int i, j; |
||||
|
||||
for (i = 0; i < 3; i++) { |
||||
for (j = 0; j < 5; j++) |
||||
model_init(&ctx->btype[i].bt_model[j], 5); |
||||
model_init(&ctx->fill_coder[i].coef_model, 12); |
||||
model256_init(&ctx->image_coder[i].esc_model); |
||||
model256_init(&ctx->image_coder[i].vec_entry_model); |
||||
model_init(&ctx->image_coder[i].vec_size_model, 3); |
||||
for (j = 0; j < 125; j++) |
||||
model_init(&ctx->image_coder[i].vq_model[j], 5); |
||||
model_init(&ctx->dct_coder[i].dc_model, 12); |
||||
model256_init(&ctx->dct_coder[i].ac_model); |
||||
model_init(&ctx->haar_coder[i].coef_hi_model, 12); |
||||
model256_init(&ctx->haar_coder[i].coef_model); |
||||
} |
||||
} |
||||
|
||||
static int mss3_decode_frame(AVCodecContext *avctx, void *data, int *data_size, |
||||
AVPacket *avpkt) |
||||
{ |
||||
const uint8_t *buf = avpkt->data; |
||||
int buf_size = avpkt->size; |
||||
MSS3Context *c = avctx->priv_data; |
||||
RangeCoder *acoder = &c->coder; |
||||
GetByteContext gb; |
||||
uint8_t *dst[3]; |
||||
int dec_width, dec_height, dec_x, dec_y, quality, keyframe; |
||||
int x, y, i, mb_width, mb_height, blk_size, btype; |
||||
int ret; |
||||
|
||||
if (buf_size < HEADER_SIZE) { |
||||
av_log(avctx, AV_LOG_ERROR, |
||||
"Frame should have at least %d bytes, got %d instead\n", |
||||
HEADER_SIZE, buf_size); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
bytestream2_init(&gb, buf, buf_size); |
||||
keyframe = bytestream2_get_be32(&gb); |
||||
if (keyframe & ~0x301) { |
||||
av_log(avctx, AV_LOG_ERROR, "Invalid frame type %X\n", keyframe); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
keyframe = !(keyframe & 1); |
||||
bytestream2_skip(&gb, 6); |
||||
dec_x = bytestream2_get_be16(&gb); |
||||
dec_y = bytestream2_get_be16(&gb); |
||||
dec_width = bytestream2_get_be16(&gb); |
||||
dec_height = bytestream2_get_be16(&gb); |
||||
|
||||
if (dec_x + dec_width > avctx->width || |
||||
dec_y + dec_height > avctx->height || |
||||
(dec_width | dec_height) & 0xF) { |
||||
av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d +%d,%d\n", |
||||
dec_width, dec_height, dec_x, dec_y); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
bytestream2_skip(&gb, 4); |
||||
quality = bytestream2_get_byte(&gb); |
||||
if (quality < 1 || quality > 100) { |
||||
av_log(avctx, AV_LOG_ERROR, "Invalid quality setting %d\n", quality); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
bytestream2_skip(&gb, 4); |
||||
|
||||
if (keyframe && !bytestream2_get_bytes_left(&gb)) { |
||||
av_log(avctx, AV_LOG_ERROR, "Keyframe without data found\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
if (!keyframe && c->got_error) |
||||
return buf_size; |
||||
c->got_error = 0; |
||||
|
||||
c->pic.reference = 3; |
||||
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | |
||||
FF_BUFFER_HINTS_REUSABLE; |
||||
if ((ret = avctx->reget_buffer(avctx, &c->pic)) < 0) { |
||||
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
||||
return ret; |
||||
} |
||||
c->pic.key_frame = keyframe; |
||||
c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
||||
if (!bytestream2_get_bytes_left(&gb)) { |
||||
*data_size = sizeof(AVFrame); |
||||
*(AVFrame*)data = c->pic; |
||||
|
||||
return buf_size; |
||||
} |
||||
|
||||
reset_coders(c, quality); |
||||
|
||||
rac_init(acoder, buf + HEADER_SIZE, buf_size - HEADER_SIZE); |
||||
|
||||
mb_width = dec_width >> 4; |
||||
mb_height = dec_height >> 4; |
||||
dst[0] = c->pic.data[0] + dec_x + dec_y * c->pic.linesize[0]; |
||||
dst[1] = c->pic.data[1] + dec_x / 2 + (dec_y / 2) * c->pic.linesize[1]; |
||||
dst[2] = c->pic.data[2] + dec_x / 2 + (dec_y / 2) * c->pic.linesize[2]; |
||||
for (y = 0; y < mb_height; y++) { |
||||
for (x = 0; x < mb_width; x++) { |
||||
for (i = 0; i < 3; i++) { |
||||
blk_size = 8 << !i; |
||||
|
||||
btype = decode_block_type(acoder, c->btype + i); |
||||
switch (btype) { |
||||
case FILL_BLOCK: |
||||
decode_fill_block(acoder, c->fill_coder + i, |
||||
dst[i] + x * blk_size, |
||||
c->pic.linesize[i], blk_size); |
||||
break; |
||||
case IMAGE_BLOCK: |
||||
decode_image_block(acoder, c->image_coder + i, |
||||
dst[i] + x * blk_size, |
||||
c->pic.linesize[i], blk_size); |
||||
break; |
||||
case DCT_BLOCK: |
||||
decode_dct_block(acoder, c->dct_coder + i, |
||||
dst[i] + x * blk_size, |
||||
c->pic.linesize[i], blk_size, |
||||
c->dctblock, x, y); |
||||
break; |
||||
case HAAR_BLOCK: |
||||
decode_haar_block(acoder, c->haar_coder + i, |
||||
dst[i] + x * blk_size, |
||||
c->pic.linesize[i], blk_size, |
||||
c->hblock); |
||||
break; |
||||
} |
||||
if (c->got_error || acoder->got_error) { |
||||
av_log(avctx, AV_LOG_ERROR, "Error decoding block %d,%d\n", |
||||
x, y); |
||||
c->got_error = 1; |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
} |
||||
} |
||||
dst[0] += c->pic.linesize[0] * 16; |
||||
dst[1] += c->pic.linesize[1] * 8; |
||||
dst[2] += c->pic.linesize[2] * 8; |
||||
} |
||||
|
||||
*data_size = sizeof(AVFrame); |
||||
*(AVFrame*)data = c->pic; |
||||
|
||||
return buf_size; |
||||
} |
||||
|
||||
static av_cold int mss3_decode_init(AVCodecContext *avctx) |
||||
{ |
||||
MSS3Context * const c = avctx->priv_data; |
||||
int i; |
||||
|
||||
c->avctx = avctx; |
||||
|
||||
if ((avctx->width & 0xF) || (avctx->height & 0xF)) { |
||||
av_log(avctx, AV_LOG_ERROR, |
||||
"Image dimensions should be a multiple of 16.\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
c->got_error = 0; |
||||
for (i = 0; i < 3; i++) { |
||||
int b_width = avctx->width >> (2 + !!i); |
||||
int b_height = avctx->height >> (2 + !!i); |
||||
c->dct_coder[i].prev_dc_stride = b_width; |
||||
c->dct_coder[i].prev_dc_height = b_height; |
||||
c->dct_coder[i].prev_dc = av_malloc(sizeof(*c->dct_coder[i].prev_dc) * |
||||
b_width * b_height); |
||||
if (!c->dct_coder[i].prev_dc) { |
||||
av_log(avctx, AV_LOG_ERROR, "Cannot allocate buffer\n"); |
||||
while (i >= 0) { |
||||
av_freep(&c->dct_coder[i].prev_dc); |
||||
i--; |
||||
} |
||||
return AVERROR(ENOMEM); |
||||
} |
||||
} |
||||
|
||||
avctx->pix_fmt = PIX_FMT_YUV420P; |
||||
avctx->coded_frame = &c->pic; |
||||
|
||||
init_coders(c); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static av_cold int mss3_decode_end(AVCodecContext *avctx) |
||||
{ |
||||
MSS3Context * const c = avctx->priv_data; |
||||
int i; |
||||
|
||||
if (c->pic.data[0]) |
||||
avctx->release_buffer(avctx, &c->pic); |
||||
for (i = 0; i < 3; i++) |
||||
av_freep(&c->dct_coder[i].prev_dc); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
AVCodec ff_msa1_decoder = { |
||||
.name = "msa1", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
.id = CODEC_ID_MSA1, |
||||
.priv_data_size = sizeof(MSS3Context), |
||||
.init = mss3_decode_init, |
||||
.close = mss3_decode_end, |
||||
.decode = mss3_decode_frame, |
||||
.capabilities = CODEC_CAP_DR1, |
||||
.long_name = NULL_IF_CONFIG_SMALL("MS ATC Screen"), |
||||
}; |
||||
Loading…
Reference in new issue