mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
388 lines
13 KiB
C
388 lines
13 KiB
C
/*
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* ClearVideo 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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* ClearVideo decoder
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*/
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#include "avcodec.h"
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#include "idctdsp.h"
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#include "internal.h"
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#include "get_bits.h"
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#include "bytestream.h"
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#define NUM_DC_CODES 127
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#define NUM_AC_CODES 103
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static const uint8_t clv_dc_codes[NUM_DC_CODES] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x07, 0x0B,
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0x0C, 0x08, 0x08, 0x09, 0x04, 0x06, 0x07, 0x05,
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0x04, 0x05, 0x04, 0x06, 0x05, 0x06, 0x07, 0x05,
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0x06, 0x07, 0x06, 0x07, 0x08, 0x06, 0x07, 0x08,
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0x09, 0x0A, 0x0B, 0x07, 0x08, 0x09, 0x07, 0x08,
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0x06, 0x07, 0x08, 0x06, 0x04, 0x05, 0x02, 0x01,
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0x03, 0x06, 0x07, 0x07, 0x09, 0x0A, 0x0B, 0x09,
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0x0A, 0x0B, 0x0A, 0x0B, 0x0C, 0x0D, 0x0C, 0x09,
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0x0D, 0x0A, 0x0B, 0x08, 0x09, 0x0A, 0x0B, 0x07,
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0x08, 0x09, 0x0A, 0x0B, 0x06, 0x07, 0x06, 0x08,
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0x07, 0x09, 0x0A, 0x0B, 0x09, 0x0A, 0x0B, 0x0C,
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0x14, 0x0D, 0x0D, 0x0E, 0x0F, 0x15, 0x15, 0x16,
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0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E,
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0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
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};
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static const uint8_t clv_dc_bits[NUM_DC_CODES] = {
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22, 22, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 21, 22, 22, 19, 20,
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20, 19, 18, 18, 15, 17, 17, 16,
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14, 15, 12, 13, 14, 14, 14, 12,
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12, 12, 11, 11, 11, 10, 10, 10,
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10, 10, 10, 9, 9, 9, 8, 8,
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7, 7, 7, 6, 5, 5, 3, 1,
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3, 5, 5, 6, 7, 7, 7, 8,
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8, 8, 9, 9, 9, 9, 10, 11,
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10, 11, 11, 12, 12, 12, 12, 13,
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14, 14, 14, 14, 15, 15, 16, 17,
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16, 17, 18, 18, 19, 19, 19, 19,
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21, 19, 20, 19, 19, 21, 22, 22,
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22, 22, 22, 22, 22, 22, 22, 22,
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22, 22, 22, 22, 22, 22, 22,
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};
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static const uint16_t clv_ac_syms[NUM_AC_CODES] = {
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0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008,
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0x0009, 0x000A, 0x000B, 0x000C, 0x0011, 0x0012, 0x0013, 0x0014,
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0x0015, 0x0016, 0x0021, 0x0022, 0x0023, 0x0024, 0x0031, 0x0032,
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0x0033, 0x0041, 0x0042, 0x0043, 0x0051, 0x0052, 0x0053, 0x0061,
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0x0062, 0x0063, 0x0071, 0x0072, 0x0081, 0x0082, 0x0091, 0x0092,
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0x00A1, 0x00A2, 0x00B1, 0x00C1, 0x00D1, 0x00E1, 0x00F1, 0x0101,
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0x0111, 0x0121, 0x0131, 0x0141, 0x0151, 0x0161, 0x0171, 0x0181,
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0x0191, 0x01A1, 0x1001, 0x1002, 0x1003, 0x1011, 0x1012, 0x1021,
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0x1031, 0x1041, 0x1051, 0x1061, 0x1071, 0x1081, 0x1091, 0x10A1,
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0x10B1, 0x10C1, 0x10D1, 0x10E1, 0x10F1, 0x1101, 0x1111, 0x1121,
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0x1131, 0x1141, 0x1151, 0x1161, 0x1171, 0x1181, 0x1191, 0x11A1,
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0x11B1, 0x11C1, 0x11D1, 0x11E1, 0x11F1, 0x1201, 0x1211, 0x1221,
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0x1231, 0x1241, 0x1251, 0x1261, 0x1271, 0x1281, 0x1BFF,
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};
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static const uint8_t clv_ac_codes[NUM_AC_CODES] = {
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0x02, 0x0F, 0x15, 0x17, 0x1F, 0x25, 0x24, 0x21,
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0x20, 0x07, 0x06, 0x20, 0x06, 0x14, 0x1E, 0x0F,
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0x21, 0x50, 0x0E, 0x1D, 0x0E, 0x51, 0x0D, 0x23,
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0x0D, 0x0C, 0x22, 0x52, 0x0B, 0x0C, 0x53, 0x13,
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0x0B, 0x54, 0x12, 0x0A, 0x11, 0x09, 0x10, 0x08,
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0x16, 0x55, 0x15, 0x14, 0x1C, 0x1B, 0x21, 0x20,
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0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x22, 0x23,
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0x56, 0x57, 0x07, 0x19, 0x05, 0x0F, 0x04, 0x0E,
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0x0D, 0x0C, 0x13, 0x12, 0x11, 0x10, 0x1A, 0x19,
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0x18, 0x17, 0x16, 0x15, 0x14, 0x13, 0x18, 0x17,
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0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x07, 0x06,
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0x05, 0x04, 0x24, 0x25, 0x26, 0x27, 0x58, 0x59,
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0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x03,
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};
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static const uint8_t clv_ac_bits[NUM_AC_CODES] = {
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2, 4, 6, 7, 8, 9, 9, 10,
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10, 11, 11, 11, 3, 6, 8, 10,
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11, 12, 4, 8, 10, 12, 5, 9,
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10, 5, 9, 12, 5, 10, 12, 6,
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10, 12, 6, 10, 6, 10, 6, 10,
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7, 12, 7, 7, 8, 8, 9, 9,
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9, 9, 9, 9, 9, 9, 11, 11,
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12, 12, 4, 9, 11, 6, 11, 6,
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6, 6, 7, 7, 7, 7, 8, 8,
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8, 8, 8, 8, 8, 8, 9, 9,
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9, 9, 9, 9, 9, 9, 10, 10,
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10, 10, 11, 11, 11, 11, 12, 12,
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12, 12, 12, 12, 12, 12, 7,
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};
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typedef struct CLVContext {
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AVCodecContext *avctx;
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IDCTDSPContext idsp;
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AVFrame *pic;
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GetBitContext gb;
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int mb_width, mb_height;
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VLC dc_vlc, ac_vlc;
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int luma_dc_quant, chroma_dc_quant, ac_quant;
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DECLARE_ALIGNED(16, int16_t, block)[64];
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int top_dc[3], left_dc[4];
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} CLVContext;
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static inline int decode_block(CLVContext *ctx, int16_t *blk, int has_ac,
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int ac_quant)
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{
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GetBitContext *gb = &ctx->gb;
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int idx = 1, last = 0, val, skip;
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memset(blk, 0, sizeof(*blk) * 64);
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blk[0] = get_vlc2(gb, ctx->dc_vlc.table, 9, 3);
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if (blk[0] < 0)
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return AVERROR_INVALIDDATA;
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blk[0] -= 63;
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if (!has_ac)
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return 0;
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while (idx < 64 && !last) {
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val = get_vlc2(gb, ctx->ac_vlc.table, 9, 2);
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if (val < 0)
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return AVERROR_INVALIDDATA;
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if (val != 0x1BFF) {
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last = val >> 12;
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skip = (val >> 4) & 0xFF;
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val &= 0xF;
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if (get_bits1(gb))
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val = -val;
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} else {
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last = get_bits1(gb);
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skip = get_bits(gb, 6);
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val = get_sbits(gb, 8);
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}
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if (val) {
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int aval = FFABS(val), sign = val < 0;
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val = ac_quant * (2 * aval + 1);
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if (!(ac_quant & 1))
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val--;
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if (sign)
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val = -val;
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}
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idx += skip;
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if (idx >= 64)
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return AVERROR_INVALIDDATA;
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blk[ff_zigzag_direct[idx++]] = val;
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}
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return (idx <= 64 && last) ? 0 : -1;
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}
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#define DCT_TEMPLATE(blk, step, bias, shift, dshift, OP) \
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const int t0 = OP( 2841 * blk[1 * step] + 565 * blk[7 * step]); \
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const int t1 = OP( 565 * blk[1 * step] - 2841 * blk[7 * step]); \
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const int t2 = OP( 1609 * blk[5 * step] + 2408 * blk[3 * step]); \
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const int t3 = OP( 2408 * blk[5 * step] - 1609 * blk[3 * step]); \
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const int t4 = OP( 1108 * blk[2 * step] - 2676 * blk[6 * step]); \
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const int t5 = OP( 2676 * blk[2 * step] + 1108 * blk[6 * step]); \
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const int t6 = ((blk[0 * step] + blk[4 * step]) << dshift) + bias; \
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const int t7 = ((blk[0 * step] - blk[4 * step]) << dshift) + bias; \
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const int t8 = t0 + t2; \
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const int t9 = t0 - t2; \
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const int tA = 181 * (t9 + (t1 - t3)) + 0x80 >> 8; \
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const int tB = 181 * (t9 - (t1 - t3)) + 0x80 >> 8; \
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const int tC = t1 + t3; \
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\
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blk[0 * step] = (t6 + t5 + t8) >> shift; \
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blk[1 * step] = (t7 + t4 + tA) >> shift; \
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blk[2 * step] = (t7 - t4 + tB) >> shift; \
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blk[3 * step] = (t6 - t5 + tC) >> shift; \
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blk[4 * step] = (t6 - t5 - tC) >> shift; \
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blk[5 * step] = (t7 - t4 - tB) >> shift; \
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blk[6 * step] = (t7 + t4 - tA) >> shift; \
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blk[7 * step] = (t6 + t5 - t8) >> shift; \
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#define ROP(x) x
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#define COP(x) (((x) + 4) >> 3)
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static void clv_dct(int16_t *block)
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{
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int i;
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int16_t *ptr;
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ptr = block;
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for (i = 0; i < 8; i++) {
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DCT_TEMPLATE(ptr, 1, 0x80, 8, 11, ROP);
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ptr += 8;
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}
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ptr = block;
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for (i = 0; i < 8; i++) {
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DCT_TEMPLATE(ptr, 8, 0x2000, 14, 8, COP);
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ptr++;
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}
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}
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static int decode_mb(CLVContext *c, int x, int y)
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{
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int i;
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int has_ac[6];
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int off;
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for (i = 0; i < 6; i++)
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has_ac[i] = get_bits1(&c->gb);
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off = x * 16 + y * 16 * c->pic->linesize[0];
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for (i = 0; i < 4; i++) {
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if (decode_block(c, c->block, has_ac[i], c->ac_quant) < 0)
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return AVERROR_INVALIDDATA;
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if (!x && !(i & 1)) {
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c->block[0] += c->top_dc[0];
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c->top_dc[0] = c->block[0];
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} else {
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c->block[0] += c->left_dc[(i & 2) >> 1];
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}
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c->left_dc[(i & 2) >> 1] = c->block[0];
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c->block[0] *= c->luma_dc_quant;
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clv_dct(c->block);
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if (i == 2)
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off += c->pic->linesize[0] * 8;
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c->idsp.put_pixels_clamped(c->block, c->pic->data[0] + off + (i & 1) * 8,
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c->pic->linesize[0]);
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}
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off = x * 8 + y * 8 * c->pic->linesize[1];
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for (i = 1; i < 3; i++) {
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if (decode_block(c, c->block, has_ac[i + 3], c->ac_quant) < 0)
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return AVERROR_INVALIDDATA;
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if (!x) {
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c->block[0] += c->top_dc[i];
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c->top_dc[i] = c->block[0];
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} else {
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c->block[0] += c->left_dc[i + 1];
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}
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c->left_dc[i + 1] = c->block[0];
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c->block[0] *= c->chroma_dc_quant;
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clv_dct(c->block);
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c->idsp.put_pixels_clamped(c->block, c->pic->data[i] + off,
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c->pic->linesize[i]);
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}
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return 0;
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}
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static int clv_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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CLVContext *c = avctx->priv_data;
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GetByteContext gb;
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uint32_t frame_type;
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int i, j;
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int ret;
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bytestream2_init(&gb, buf, buf_size);
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if (avctx->codec_tag == MKTAG('C','L','V','1')) {
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int skip = bytestream2_get_byte(&gb);
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bytestream2_skip(&gb, (skip + 1) * 8);
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}
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frame_type = bytestream2_get_byte(&gb);
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if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
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return ret;
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c->pic->key_frame = frame_type & 0x20 ? 1 : 0;
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c->pic->pict_type = frame_type & 0x20 ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
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if (frame_type & 0x2) {
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bytestream2_get_be32(&gb); // frame size;
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c->ac_quant = bytestream2_get_byte(&gb);
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c->luma_dc_quant = 32;
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c->chroma_dc_quant = 32;
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if ((ret = init_get_bits8(&c->gb, buf + bytestream2_tell(&gb),
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(buf_size - bytestream2_tell(&gb)))) < 0)
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return ret;
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for (i = 0; i < 3; i++)
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c->top_dc[i] = 32;
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for (i = 0; i < 4; i++)
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c->left_dc[i] = 32;
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for (j = 0; j < c->mb_height; j++) {
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for (i = 0; i < c->mb_width; i++) {
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ret |= decode_mb(c, i, j);
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}
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}
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} else {
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}
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if ((ret = av_frame_ref(data, c->pic)) < 0)
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return ret;
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*got_frame = 1;
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return ret < 0 ? ret : buf_size;
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}
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static av_cold int clv_decode_init(AVCodecContext *avctx)
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{
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CLVContext * const c = avctx->priv_data;
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int ret;
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c->avctx = avctx;
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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c->pic = av_frame_alloc();
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if (!c->pic)
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return AVERROR(ENOMEM);
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c->mb_width = FFALIGN(avctx->width, 16) >> 4;
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c->mb_height = FFALIGN(avctx->height, 16) >> 4;
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ff_idctdsp_init(&c->idsp, avctx);
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ret = init_vlc(&c->dc_vlc, 9, NUM_DC_CODES,
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clv_dc_bits, 1, 1,
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clv_dc_codes, 1, 1, 0);
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if (ret) {
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av_log(avctx, AV_LOG_ERROR, "Error initialising DC VLC\n");
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return ret;
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}
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ret = ff_init_vlc_sparse(&c->ac_vlc, 9, NUM_AC_CODES,
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clv_ac_bits, 1, 1,
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clv_ac_codes, 1, 1,
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clv_ac_syms, 2, 2, 0);
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if (ret) {
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av_log(avctx, AV_LOG_ERROR, "Error initialising AC VLC\n");
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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 int clv_decode_end(AVCodecContext *avctx)
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{
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CLVContext * const c = avctx->priv_data;
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av_frame_free(&c->pic);
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ff_free_vlc(&c->dc_vlc);
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ff_free_vlc(&c->ac_vlc);
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return 0;
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}
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AVCodec ff_clearvideo_decoder = {
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.name = "clearvideo",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_CLEARVIDEO,
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.priv_data_size = sizeof(CLVContext),
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.init = clv_decode_init,
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.close = clv_decode_end,
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.decode = clv_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Iterated Systems ClearVideo"),
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};
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