mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-10-31 20:42:49 +08:00
684 lines
21 KiB
C
684 lines
21 KiB
C
/*
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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 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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* 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 "get_bits.h"
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#include "internal.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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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);
|
|
}
|
|
} else if (mode == 2) {
|
|
if (get_bits1(gb))
|
|
read_vec_pos(gb, vals, sel_flag, sel_len, vals);
|
|
}
|
|
for (k = 0; k < 3; k++)
|
|
*dst[k]++ = get_value_cached(gb, vals[k], vec[k],
|
|
vec_len[k], k,
|
|
val_shift, prev_pix);
|
|
prev_mode[i] = MKVAL(vals);
|
|
}
|
|
} else {
|
|
if (get_bits1(gb)) {
|
|
split = get_bits(gb, 4);
|
|
if (split >= prev_split)
|
|
split++;
|
|
prev_split = split;
|
|
} 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 *got_frame,
|
|
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;
|
|
}
|
|
|
|
if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
|
|
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) {
|
|
*got_frame = 1;
|
|
if ((ret = av_frame_ref(data, c->pic)) < 0)
|
|
return ret;
|
|
|
|
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);
|
|
}
|
|
|
|
if ((ret = init_get_bits8(&gb, buf + HEADER_SIZE, buf_size - HEADER_SIZE)) < 0)
|
|
return ret;
|
|
|
|
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;
|
|
}
|
|
|
|
if ((ret = av_frame_ref(data, c->pic)) < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int mss4_decode_end(AVCodecContext *avctx)
|
|
{
|
|
MSS4Context * const c = avctx->priv_data;
|
|
int i;
|
|
|
|
av_frame_free(&c->pic);
|
|
for (i = 0; i < 3; i++)
|
|
av_freep(&c->prev_dc[i]);
|
|
mss4_free_vlcs(c);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_array(c->dc_stride[i], sizeof(**c->prev_dc));
|
|
if (!c->prev_dc[i]) {
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot allocate buffer\n");
|
|
mss4_free_vlcs(c);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
}
|
|
|
|
c->pic = av_frame_alloc();
|
|
if (!c->pic) {
|
|
mss4_decode_end(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_mts2_decoder = {
|
|
.name = "mts2",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MS Expression Encoder Screen"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_MTS2,
|
|
.priv_data_size = sizeof(MSS4Context),
|
|
.init = mss4_decode_init,
|
|
.close = mss4_decode_end,
|
|
.decode = mss4_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|