mirror of https://github.com/FFmpeg/FFmpeg.git
Kostya Shishkov
13 years ago
parent
7548831c5e
commit
5b7e3a195d
8 changed files with 690 additions and 1 deletions
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/*
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* Microsoft Screen 4 (aka Microsoft Expression Encoder 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 4 (aka Microsoft Titanium Screen 2, |
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* aka Microsoft Expression Encoder Screen) decoder |
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*/ |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "dsputil.h" |
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#include "get_bits.h" |
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#include "mss34dsp.h" |
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#include "unary.h" |
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#define HEADER_SIZE 8 |
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enum FrameType { |
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INTRA_FRAME = 0, |
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INTER_FRAME, |
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SKIP_FRAME |
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}; |
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enum BlockType { |
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SKIP_BLOCK = 0, |
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DCT_BLOCK, |
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IMAGE_BLOCK, |
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}; |
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enum CachePos { |
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LEFT = 0, |
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TOP_LEFT, |
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TOP, |
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}; |
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static const uint8_t mss4_dc_vlc_lens[2][16] = { |
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{ 0, 1, 5, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0 }, |
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{ 0, 3, 1, 1, 1, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0 } |
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}; |
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static const uint8_t mss4_ac_vlc_lens[2][16] = { |
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{ 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 125 }, |
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{ 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 119 } |
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}; |
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static const uint8_t mss4_ac_vlc_syms[2][162] = { |
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{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, |
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, |
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08, |
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0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0, |
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, |
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0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28, |
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0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
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0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
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0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
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0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
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0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
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0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
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0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
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0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, |
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0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, |
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0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, |
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0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, |
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0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2, |
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0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, |
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0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, |
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0xF9, 0xFA }, |
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{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, |
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, |
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, |
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0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0, |
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0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34, |
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0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26, |
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0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, |
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0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, |
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0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
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0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
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0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
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0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
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0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, |
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0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, |
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0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, |
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0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, |
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0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, |
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0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, |
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0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, |
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0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, |
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0xF9, 0xFA } |
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}; |
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static const uint8_t vec_len_syms[2][4] = { |
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{ 4, 2, 3, 1 }, |
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{ 4, 1, 2, 3 } |
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}; |
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static const uint8_t mss4_vec_entry_vlc_lens[2][16] = { |
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{ 0, 2, 2, 3, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
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{ 0, 1, 5, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } |
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}; |
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static const uint8_t mss4_vec_entry_vlc_syms[2][9] = { |
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{ 0, 7, 6, 5, 8, 4, 3, 1, 2 }, |
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{ 0, 2, 3, 4, 5, 6, 7, 1, 8 } |
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}; |
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#define MAX_ENTRIES 162 |
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typedef struct MSS4Context { |
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AVFrame pic; |
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DSPContext dsp; |
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VLC dc_vlc[2], ac_vlc[2]; |
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VLC vec_entry_vlc[2]; |
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int block[64]; |
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uint8_t imgbuf[3][16 * 16]; |
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int quality; |
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uint16_t quant_mat[2][64]; |
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int *prev_dc[3]; |
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int dc_stride[3]; |
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int dc_cache[4][4]; |
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int prev_vec[3][4]; |
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} MSS4Context; |
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static av_cold int mss4_init_vlc(VLC *vlc, const uint8_t *lens, |
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const uint8_t *syms, int num_syms) |
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{ |
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uint8_t bits[MAX_ENTRIES]; |
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uint16_t codes[MAX_ENTRIES]; |
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int i, j; |
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int prefix = 0, max_bits = 0, idx = 0; |
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for (i = 0; i < 16; i++) { |
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for (j = 0; j < lens[i]; j++) { |
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bits[idx] = i + 1; |
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codes[idx] = prefix++; |
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max_bits = i + 1; |
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idx++; |
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} |
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prefix <<= 1; |
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} |
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return ff_init_vlc_sparse(vlc, FFMIN(max_bits, 9), num_syms, bits, 1, 1, |
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codes, 2, 2, syms, 1, 1, 0); |
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} |
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static av_cold int mss4_init_vlcs(MSS4Context *ctx) |
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{ |
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int ret, i; |
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for (i = 0; i < 2; i++) { |
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ret = mss4_init_vlc(&ctx->dc_vlc[i], mss4_dc_vlc_lens[i], NULL, 12); |
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if (ret) |
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return ret; |
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ret = mss4_init_vlc(&ctx->ac_vlc[i], mss4_ac_vlc_lens[i], |
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mss4_ac_vlc_syms[i], 162); |
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if (ret) |
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return ret; |
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ret = mss4_init_vlc(&ctx->vec_entry_vlc[i], mss4_vec_entry_vlc_lens[i], |
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mss4_vec_entry_vlc_syms[i], 9); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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static av_cold void mss4_free_vlcs(MSS4Context *ctx) |
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{ |
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int i; |
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for (i = 0; i < 2; i++) { |
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ff_free_vlc(&ctx->dc_vlc[i]); |
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ff_free_vlc(&ctx->ac_vlc[i]); |
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ff_free_vlc(&ctx->vec_entry_vlc[i]); |
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} |
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} |
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/* This function returns values in the range
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* (-range + 1; -range/2] U [range/2; range - 1) |
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* i.e. |
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* nbits = 0 -> 0 |
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* nbits = 1 -> -1, 1 |
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* nbits = 2 -> -3, -2, 2, 3 |
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*/ |
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static av_always_inline int get_coeff_bits(GetBitContext *gb, int nbits) |
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{ |
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int val; |
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if (!nbits) |
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return 0; |
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val = get_bits(gb, nbits); |
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if (val < (1 << (nbits - 1))) |
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val -= (1 << nbits) - 1; |
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return val; |
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} |
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static inline int get_coeff(GetBitContext *gb, VLC *vlc) |
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{ |
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int val = get_vlc2(gb, vlc->table, vlc->bits, 2); |
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return get_coeff_bits(gb, val); |
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} |
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static int mss4_decode_dct(GetBitContext *gb, VLC *dc_vlc, VLC *ac_vlc, |
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int *block, int *dc_cache, |
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int bx, int by, uint16_t *quant_mat) |
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{ |
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int skip, val, pos = 1, zz_pos, dc; |
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memset(block, 0, sizeof(*block) * 64); |
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dc = get_coeff(gb, dc_vlc); |
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// DC prediction is the same as in MSS3
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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 = dc_cache[LEFT]; |
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tl = dc_cache[TOP_LEFT]; |
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t = dc_cache[TOP]; |
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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 += dc_cache[TOP]; |
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} |
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} else if (bx) { |
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dc += dc_cache[LEFT]; |
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} |
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dc_cache[LEFT] = dc; |
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block[0] = dc * quant_mat[0]; |
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while (pos < 64) { |
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val = get_vlc2(gb, ac_vlc->table, 9, 2); |
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if (!val) |
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return 0; |
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if (val == -1) |
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return -1; |
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if (val == 0xF0) { |
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pos += 16; |
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continue; |
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} |
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skip = val >> 4; |
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val = get_coeff_bits(gb, val & 0xF); |
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pos += skip; |
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if (pos >= 64) |
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return -1; |
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zz_pos = ff_zigzag_direct[pos]; |
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block[zz_pos] = val * quant_mat[zz_pos]; |
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pos++; |
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} |
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return pos == 64 ? 0 : -1; |
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} |
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static int mss4_decode_dct_block(MSS4Context *c, GetBitContext *gb, |
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uint8_t *dst[3], int mb_x, int mb_y) |
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{ |
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int i, j, k, ret; |
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uint8_t *out = dst[0]; |
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for (j = 0; j < 2; j++) { |
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for (i = 0; i < 2; i++) { |
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int xpos = mb_x * 2 + i; |
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c->dc_cache[j][TOP_LEFT] = c->dc_cache[j][TOP]; |
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c->dc_cache[j][TOP] = c->prev_dc[0][mb_x * 2 + i]; |
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ret = mss4_decode_dct(gb, c->dc_vlc, c->ac_vlc, c->block, |
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c->dc_cache[j], |
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xpos, mb_y * 2 + j, c->quant_mat[0]); |
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if (ret) |
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return ret; |
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c->prev_dc[0][mb_x * 2 + i] = c->dc_cache[j][LEFT]; |
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ff_mss34_dct_put(out + xpos * 8, c->pic.linesize[0], |
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c->block); |
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} |
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out += 8 * c->pic.linesize[0]; |
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} |
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for (i = 1; i < 3; i++) { |
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c->dc_cache[i + 1][TOP_LEFT] = c->dc_cache[i + 1][TOP]; |
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c->dc_cache[i + 1][TOP] = c->prev_dc[i][mb_x]; |
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ret = mss4_decode_dct(gb, c->dc_vlc + 1, c->ac_vlc + 1, |
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c->block, c->dc_cache[i + 1], mb_x, mb_y, |
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c->quant_mat[1]); |
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if (ret) |
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return ret; |
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c->prev_dc[i][mb_x] = c->dc_cache[i + 1][LEFT]; |
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ff_mss34_dct_put(c->imgbuf[i], 8, c->block); |
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out = dst[i] + mb_x * 16; |
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// Since the DCT block is coded as YUV420 and the whole frame as YUV444,
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// we need to scale chroma.
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for (j = 0; j < 16; j++) { |
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for (k = 0; k < 8; k++) |
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AV_WN16A(out + k * 2, c->imgbuf[i][k + (j & ~1) * 4] * 0x101); |
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out += c->pic.linesize[i]; |
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} |
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} |
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return 0; |
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} |
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static void read_vec_pos(GetBitContext *gb, int *vec_pos, int *sel_flag, |
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int *sel_len, int *prev) |
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{ |
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int i, y_flag = 0; |
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for (i = 2; i >= 0; i--) { |
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if (!sel_flag[i]) { |
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vec_pos[i] = 0; |
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continue; |
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} |
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if ((!i && !y_flag) || get_bits1(gb)) { |
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if (sel_len[i] > 0) { |
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int pval = prev[i]; |
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vec_pos[i] = get_bits(gb, sel_len[i]); |
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if (vec_pos[i] >= pval) |
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vec_pos[i]++; |
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} else { |
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vec_pos[i] = !prev[i]; |
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} |
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y_flag = 1; |
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} else { |
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vec_pos[i] = prev[i]; |
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} |
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} |
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} |
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static int get_value_cached(GetBitContext *gb, int vec_pos, uint8_t *vec, |
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int vec_size, int component, int shift, int *prev) |
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{ |
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if (vec_pos < vec_size) |
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return vec[vec_pos]; |
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if (!get_bits1(gb)) |
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return prev[component]; |
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prev[component] = get_bits(gb, 8 - shift) << shift; |
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return prev[component]; |
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} |
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#define MKVAL(vals) (vals[0] | (vals[1] << 3) | (vals[2] << 6)) |
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/* Image mode - the hardest to comprehend MSS4 coding mode.
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* |
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* In this mode all three 16x16 blocks are coded together with a method |
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* remotely similar to the methods employed in MSS1-MSS3. |
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* The idea is that every component has a vector of 1-4 most common symbols |
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* and an escape mode for reading new value from the bitstream. Decoding |
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* consists of retrieving pixel values from the vector or reading new ones |
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* from the bitstream; depending on flags read from the bitstream, these vector |
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* positions can be updated or reused from the state of the previous line |
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* or previous pixel. |
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*/ |
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static int mss4_decode_image_block(MSS4Context *ctx, GetBitContext *gb, |
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uint8_t *picdst[3], int mb_x, int mb_y) |
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{ |
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uint8_t vec[3][4]; |
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int vec_len[3]; |
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int sel_len[3], sel_flag[3]; |
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int i, j, k, mode, split; |
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int prev_vec1 = 0, prev_split = 0; |
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int vals[3] = { 0 }; |
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int prev_pix[3] = { 0 }; |
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int prev_mode[16] = { 0 }; |
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uint8_t *dst[3]; |
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const int val_shift = ctx->quality == 100 ? 0 : 2; |
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for (i = 0; i < 3; i++) |
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dst[i] = ctx->imgbuf[i]; |
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for (i = 0; i < 3; i++) { |
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vec_len[i] = vec_len_syms[!!i][get_unary(gb, 0, 3)]; |
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for (j = 0; j < vec_len[i]; j++) { |
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vec[i][j] = get_coeff(gb, &ctx->vec_entry_vlc[!!i]); |
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vec[i][j] += ctx->prev_vec[i][j]; |
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ctx->prev_vec[i][j] = vec[i][j]; |
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} |
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sel_flag[i] = vec_len[i] > 1; |
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sel_len[i] = vec_len[i] > 2 ? vec_len[i] - 2 : 0; |
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} |
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for (j = 0; j < 16; j++) { |
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if (get_bits1(gb)) { |
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split = 0; |
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if (get_bits1(gb)) { |
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prev_mode[0] = 0; |
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vals[0] = vals[1] = vals[2] = 0; |
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mode = 2; |
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} else { |
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mode = get_bits1(gb); |
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if (mode) |
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split = get_bits(gb, 4); |
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} |
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for (i = 0; i < 16; i++) { |
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if (mode <= 1) { |
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vals[0] = prev_mode[i] & 7; |
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vals[1] = (prev_mode[i] >> 3) & 7; |
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vals[2] = prev_mode[i] >> 6; |
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if (mode == 1 && i == split) { |
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read_vec_pos(gb, vals, sel_flag, sel_len, vals); |
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} |
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} else if (mode == 2) { |
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if (get_bits1(gb)) |
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read_vec_pos(gb, vals, sel_flag, sel_len, vals); |
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} |
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for (k = 0; k < 3; k++) |
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*dst[k]++ = get_value_cached(gb, vals[k], vec[k], |
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vec_len[k], k, |
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val_shift, prev_pix); |
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prev_mode[i] = MKVAL(vals); |
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} |
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} else { |
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if (get_bits1(gb)) { |
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split = get_bits(gb, 4); |
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if (split >= prev_split) |
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split++; |
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prev_split = split; |
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} else { |
||||
split = prev_split; |
||||
} |
||||
if (split) { |
||||
vals[0] = prev_mode[0] & 7; |
||||
vals[1] = (prev_mode[0] >> 3) & 7; |
||||
vals[2] = prev_mode[0] >> 6; |
||||
for (i = 0; i < 3; i++) { |
||||
for (k = 0; k < split; k++) { |
||||
*dst[i]++ = get_value_cached(gb, vals[i], vec[i], |
||||
vec_len[i], i, val_shift, |
||||
prev_pix); |
||||
prev_mode[k] = MKVAL(vals); |
||||
} |
||||
} |
||||
} |
||||
|
||||
if (split != 16) { |
||||
vals[0] = prev_vec1 & 7; |
||||
vals[1] = (prev_vec1 >> 3) & 7; |
||||
vals[2] = prev_vec1 >> 6; |
||||
if (get_bits1(gb)) { |
||||
read_vec_pos(gb, vals, sel_flag, sel_len, vals); |
||||
prev_vec1 = MKVAL(vals); |
||||
} |
||||
for (i = 0; i < 3; i++) { |
||||
for (k = 0; k < 16 - split; k++) { |
||||
*dst[i]++ = get_value_cached(gb, vals[i], vec[i], |
||||
vec_len[i], i, val_shift, |
||||
prev_pix); |
||||
prev_mode[split + k] = MKVAL(vals); |
||||
} |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
for (i = 0; i < 3; i++) |
||||
for (j = 0; j < 16; j++) |
||||
memcpy(picdst[i] + mb_x * 16 + j * ctx->pic.linesize[i], |
||||
ctx->imgbuf[i] + j * 16, 16); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static inline void mss4_update_dc_cache(MSS4Context *c, int mb_x) |
||||
{ |
||||
int i; |
||||
|
||||
c->dc_cache[0][TOP] = c->prev_dc[0][mb_x * 2 + 1]; |
||||
c->dc_cache[0][LEFT] = 0; |
||||
c->dc_cache[1][TOP] = 0; |
||||
c->dc_cache[1][LEFT] = 0; |
||||
|
||||
for (i = 0; i < 2; i++) |
||||
c->prev_dc[0][mb_x * 2 + i] = 0; |
||||
|
||||
for (i = 1; i < 3; i++) { |
||||
c->dc_cache[i + 1][TOP] = c->prev_dc[i][mb_x]; |
||||
c->dc_cache[i + 1][LEFT] = 0; |
||||
c->prev_dc[i][mb_x] = 0; |
||||
} |
||||
} |
||||
|
||||
static int mss4_decode_frame(AVCodecContext *avctx, void *data, int *data_size, |
||||
AVPacket *avpkt) |
||||
{ |
||||
const uint8_t *buf = avpkt->data; |
||||
int buf_size = avpkt->size; |
||||
MSS4Context *c = avctx->priv_data; |
||||
GetBitContext gb; |
||||
GetByteContext bc; |
||||
uint8_t *dst[3]; |
||||
int width, height, quality, frame_type; |
||||
int x, y, i, mb_width, mb_height, blk_type; |
||||
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(&bc, buf, buf_size); |
||||
width = bytestream2_get_be16(&bc); |
||||
height = bytestream2_get_be16(&bc); |
||||
bytestream2_skip(&bc, 2); |
||||
quality = bytestream2_get_byte(&bc); |
||||
frame_type = bytestream2_get_byte(&bc); |
||||
|
||||
if (width > avctx->width || |
||||
height != avctx->height) { |
||||
av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d\n", |
||||
width, height); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
if (quality < 1 || quality > 100) { |
||||
av_log(avctx, AV_LOG_ERROR, "Invalid quality setting %d\n", quality); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
if ((frame_type & ~3) || frame_type == 3) { |
||||
av_log(avctx, AV_LOG_ERROR, "Invalid frame type %d\n", frame_type); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
if (frame_type != SKIP_FRAME && !bytestream2_get_bytes_left(&bc)) { |
||||
av_log(avctx, AV_LOG_ERROR, |
||||
"Empty frame found but it is not a skip frame.\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
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 = (frame_type == INTRA_FRAME); |
||||
c->pic.pict_type = (frame_type == INTRA_FRAME) ? AV_PICTURE_TYPE_I |
||||
: AV_PICTURE_TYPE_P; |
||||
if (frame_type == SKIP_FRAME) { |
||||
*data_size = sizeof(AVFrame); |
||||
*(AVFrame*)data = c->pic; |
||||
|
||||
return buf_size; |
||||
} |
||||
|
||||
if (c->quality != quality) { |
||||
c->quality = quality; |
||||
for (i = 0; i < 2; i++) |
||||
ff_mss34_gen_quant_mat(c->quant_mat[i], quality, !i); |
||||
} |
||||
|
||||
init_get_bits(&gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE) * 8); |
||||
|
||||
mb_width = FFALIGN(width, 16) >> 4; |
||||
mb_height = FFALIGN(height, 16) >> 4; |
||||
dst[0] = c->pic.data[0]; |
||||
dst[1] = c->pic.data[1]; |
||||
dst[2] = c->pic.data[2]; |
||||
|
||||
memset(c->prev_vec, 0, sizeof(c->prev_vec)); |
||||
for (y = 0; y < mb_height; y++) { |
||||
memset(c->dc_cache, 0, sizeof(c->dc_cache)); |
||||
for (x = 0; x < mb_width; x++) { |
||||
blk_type = decode012(&gb); |
||||
switch (blk_type) { |
||||
case DCT_BLOCK: |
||||
if (mss4_decode_dct_block(c, &gb, dst, x, y) < 0) { |
||||
av_log(avctx, AV_LOG_ERROR, |
||||
"Error decoding DCT block %d,%d\n", |
||||
x, y); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
break; |
||||
case IMAGE_BLOCK: |
||||
if (mss4_decode_image_block(c, &gb, dst, x, y) < 0) { |
||||
av_log(avctx, AV_LOG_ERROR, |
||||
"Error decoding VQ block %d,%d\n", |
||||
x, y); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
break; |
||||
case SKIP_BLOCK: |
||||
if (frame_type == INTRA_FRAME) { |
||||
av_log(avctx, AV_LOG_ERROR, "Skip block in intra frame\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
break; |
||||
} |
||||
if (blk_type != DCT_BLOCK) |
||||
mss4_update_dc_cache(c, x); |
||||
} |
||||
dst[0] += c->pic.linesize[0] * 16; |
||||
dst[1] += c->pic.linesize[1] * 16; |
||||
dst[2] += c->pic.linesize[2] * 16; |
||||
} |
||||
|
||||
*data_size = sizeof(AVFrame); |
||||
*(AVFrame*)data = c->pic; |
||||
|
||||
return buf_size; |
||||
} |
||||
|
||||
static av_cold int mss4_decode_init(AVCodecContext *avctx) |
||||
{ |
||||
MSS4Context * const c = avctx->priv_data; |
||||
int i; |
||||
|
||||
if (mss4_init_vlcs(c)) { |
||||
av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n"); |
||||
mss4_free_vlcs(c); |
||||
return AVERROR(ENOMEM); |
||||
} |
||||
for (i = 0; i < 3; i++) { |
||||
c->dc_stride[i] = FFALIGN(avctx->width, 16) >> (2 + !!i); |
||||
c->prev_dc[i] = av_malloc(sizeof(**c->prev_dc) * c->dc_stride[i]); |
||||
if (!c->prev_dc[i]) { |
||||
av_log(avctx, AV_LOG_ERROR, "Cannot allocate buffer\n"); |
||||
mss4_free_vlcs(c); |
||||
return AVERROR(ENOMEM); |
||||
} |
||||
} |
||||
|
||||
avctx->pix_fmt = PIX_FMT_YUV444P; |
||||
avctx->coded_frame = &c->pic; |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static av_cold int mss4_decode_end(AVCodecContext *avctx) |
||||
{ |
||||
MSS4Context * 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->prev_dc[i]); |
||||
mss4_free_vlcs(c); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
AVCodec ff_mts2_decoder = { |
||||
.name = "mts2", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
.id = CODEC_ID_MTS2, |
||||
.priv_data_size = sizeof(MSS4Context), |
||||
.init = mss4_decode_init, |
||||
.close = mss4_decode_end, |
||||
.decode = mss4_decode_frame, |
||||
.capabilities = CODEC_CAP_DR1, |
||||
.long_name = NULL_IF_CONFIG_SMALL("MS Expression Encoder Screen"), |
||||
}; |
||||
Loading…
Reference in new issue