mirror of https://git.ffmpeg.org/ffmpeg.git
1038 lines
34 KiB
C
1038 lines
34 KiB
C
/*
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* 4XM codec
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* Copyright (c) 2003 Michael Niedermayer
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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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* 4XM codec.
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*/
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#include <inttypes.h>
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#include "libavutil/avassert.h"
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#include "libavutil/frame.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "blockdsp.h"
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#include "bswapdsp.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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#define BLOCK_TYPE_VLC_BITS 5
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#define ACDC_VLC_BITS 9
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#define CFRAME_BUFFER_COUNT 100
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static const uint8_t block_type_tab[2][4][8][2] = {
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{
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{ // { 8, 4, 2 } x { 8, 4, 2}
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{ 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 30, 5 }, { 31, 5 }, { 0, 0 }
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}, { // { 8, 4 } x 1
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{ 0, 1 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 }
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}, { // 1 x { 8, 4 }
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{ 0, 1 }, { 2, 2 }, { 0, 0 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 }
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}, { // 1 x 2, 2 x 1
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{ 0, 1 }, { 0, 0 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }
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}
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}, {
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{ // { 8, 4, 2 } x { 8, 4, 2}
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{ 1, 2 }, { 4, 3 }, { 5, 3 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
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}, {// { 8, 4 } x 1
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{ 1, 2 }, { 0, 0 }, { 2, 2 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
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}, {// 1 x { 8, 4 }
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{ 1, 2 }, { 2, 2 }, { 0, 0 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 }
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}, {// 1 x 2, 2 x 1
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{ 1, 2 }, { 0, 0 }, { 0, 0 }, { 0, 2 }, { 2, 2 }, { 6, 3 }, { 7, 3 }
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}
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}
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};
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static const uint8_t size2index[4][4] = {
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{ -1, 3, 1, 1 },
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{ 3, 0, 0, 0 },
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{ 2, 0, 0, 0 },
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{ 2, 0, 0, 0 },
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};
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static const int8_t mv[256][2] = {
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{ 0, 0 }, { 0, -1 }, { -1, 0 }, { 1, 0 }, { 0, 1 }, { -1, -1 }, { 1, -1 }, { -1, 1 },
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{ 1, 1 }, { 0, -2 }, { -2, 0 }, { 2, 0 }, { 0, 2 }, { -1, -2 }, { 1, -2 }, { -2, -1 },
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{ 2, -1 }, { -2, 1 }, { 2, 1 }, { -1, 2 }, { 1, 2 }, { -2, -2 }, { 2, -2 }, { -2, 2 },
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{ 2, 2 }, { 0, -3 }, { -3, 0 }, { 3, 0 }, { 0, 3 }, { -1, -3 }, { 1, -3 }, { -3, -1 },
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{ 3, -1 }, { -3, 1 }, { 3, 1 }, { -1, 3 }, { 1, 3 }, { -2, -3 }, { 2, -3 }, { -3, -2 },
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{ 3, -2 }, { -3, 2 }, { 3, 2 }, { -2, 3 }, { 2, 3 }, { 0, -4 }, { -4, 0 }, { 4, 0 },
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{ 0, 4 }, { -1, -4 }, { 1, -4 }, { -4, -1 }, { 4, -1 }, { 4, 1 }, { -1, 4 }, { 1, 4 },
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{ -3, -3 }, { -3, 3 }, { 3, 3 }, { -2, -4 }, { -4, -2 }, { 4, -2 }, { -4, 2 }, { -2, 4 },
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{ 2, 4 }, { -3, -4 }, { 3, -4 }, { 4, -3 }, { -5, 0 }, { -4, 3 }, { -3, 4 }, { 3, 4 },
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{ -1, -5 }, { -5, -1 }, { -5, 1 }, { -1, 5 }, { -2, -5 }, { 2, -5 }, { 5, -2 }, { 5, 2 },
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{ -4, -4 }, { -4, 4 }, { -3, -5 }, { -5, -3 }, { -5, 3 }, { 3, 5 }, { -6, 0 }, { 0, 6 },
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{ -6, -1 }, { -6, 1 }, { 1, 6 }, { 2, -6 }, { -6, 2 }, { 2, 6 }, { -5, -4 }, { 5, 4 },
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{ 4, 5 }, { -6, -3 }, { 6, 3 }, { -7, 0 }, { -1, -7 }, { 5, -5 }, { -7, 1 }, { -1, 7 },
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{ 4, -6 }, { 6, 4 }, { -2, -7 }, { -7, 2 }, { -3, -7 }, { 7, -3 }, { 3, 7 }, { 6, -5 },
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{ 0, -8 }, { -1, -8 }, { -7, -4 }, { -8, 1 }, { 4, 7 }, { 2, -8 }, { -2, 8 }, { 6, 6 },
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{ -8, 3 }, { 5, -7 }, { -5, 7 }, { 8, -4 }, { 0, -9 }, { -9, -1 }, { 1, 9 }, { 7, -6 },
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{ -7, 6 }, { -5, -8 }, { -5, 8 }, { -9, 3 }, { 9, -4 }, { 7, -7 }, { 8, -6 }, { 6, 8 },
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{ 10, 1 }, { -10, 2 }, { 9, -5 }, { 10, -3 }, { -8, -7 }, { -10, -4 }, { 6, -9 }, { -11, 0 },
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{ 11, 1 }, { -11, -2 }, { -2, 11 }, { 7, -9 }, { -7, 9 }, { 10, 6 }, { -4, 11 }, { 8, -9 },
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{ 8, 9 }, { 5, 11 }, { 7, -10 }, { 12, -3 }, { 11, 6 }, { -9, -9 }, { 8, 10 }, { 5, 12 },
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{ -11, 7 }, { 13, 2 }, { 6, -12 }, { 10, 9 }, { -11, 8 }, { -7, 12 }, { 0, 14 }, { 14, -2 },
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{ -9, 11 }, { -6, 13 }, { -14, -4 }, { -5, -14 }, { 5, 14 }, { -15, -1 }, { -14, -6 }, { 3, -15 },
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{ 11, -11 }, { -7, 14 }, { -5, 15 }, { 8, -14 }, { 15, 6 }, { 3, 16 }, { 7, -15 }, { -16, 5 },
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{ 0, 17 }, { -16, -6 }, { -10, 14 }, { -16, 7 }, { 12, 13 }, { -16, 8 }, { -17, 6 }, { -18, 3 },
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{ -7, 17 }, { 15, 11 }, { 16, 10 }, { 2, -19 }, { 3, -19 }, { -11, -16 }, { -18, 8 }, { -19, -6 },
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{ 2, -20 }, { -17, -11 }, { -10, -18 }, { 8, 19 }, { -21, -1 }, { -20, 7 }, { -4, 21 }, { 21, 5 },
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{ 15, 16 }, { 2, -22 }, { -10, -20 }, { -22, 5 }, { 20, -11 }, { -7, -22 }, { -12, 20 }, { 23, -5 },
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{ 13, -20 }, { 24, -2 }, { -15, 19 }, { -11, 22 }, { 16, 19 }, { 23, -10 }, { -18, -18 }, { -9, -24 },
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{ 24, -10 }, { -3, 26 }, { -23, 13 }, { -18, -20 }, { 17, 21 }, { -4, 27 }, { 27, 6 }, { 1, -28 },
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{ -11, 26 }, { -17, -23 }, { 7, 28 }, { 11, -27 }, { 29, 5 }, { -23, -19 }, { -28, -11 }, { -21, 22 },
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{ -30, 7 }, { -17, 26 }, { -27, 16 }, { 13, 29 }, { 19, -26 }, { 10, -31 }, { -14, -30 }, { 20, -27 },
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{ -29, 18 }, { -16, -31 }, { -28, -22 }, { 21, -30 }, { -25, 28 }, { 26, -29 }, { 25, -32 }, { -32, -32 }
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};
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/* This is simply the scaled down elementwise product of the standard JPEG
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* quantizer table and the AAN premul table. */
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static const uint8_t dequant_table[64] = {
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16, 15, 13, 19, 24, 31, 28, 17,
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17, 23, 25, 31, 36, 63, 45, 21,
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18, 24, 27, 37, 52, 59, 49, 20,
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16, 28, 34, 40, 60, 80, 51, 20,
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18, 31, 48, 66, 68, 86, 56, 21,
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19, 38, 56, 59, 64, 64, 48, 20,
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27, 48, 55, 55, 56, 51, 35, 15,
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20, 35, 34, 32, 31, 22, 15, 8,
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};
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static VLC block_type_vlc[2][4];
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typedef struct CFrameBuffer {
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unsigned int allocated_size;
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unsigned int size;
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int id;
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uint8_t *data;
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} CFrameBuffer;
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typedef struct FourXContext {
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AVCodecContext *avctx;
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BlockDSPContext bdsp;
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BswapDSPContext bbdsp;
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uint16_t *frame_buffer;
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uint16_t *last_frame_buffer;
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GetBitContext pre_gb; ///< ac/dc prefix
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GetBitContext gb;
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GetByteContext g;
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GetByteContext g2;
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int mv[256];
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VLC pre_vlc;
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int last_dc;
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DECLARE_ALIGNED(32, int16_t, block)[6][64];
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void *bitstream_buffer;
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unsigned int bitstream_buffer_size;
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int version;
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CFrameBuffer cfrm[CFRAME_BUFFER_COUNT];
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} FourXContext;
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#define FIX_1_082392200 70936
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#define FIX_1_414213562 92682
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#define FIX_1_847759065 121095
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#define FIX_2_613125930 171254
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#define MULTIPLY(var, const) ((int)((var) * (unsigned)(const)) >> 16)
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static void idct(int16_t block[64])
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{
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int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
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int tmp10, tmp11, tmp12, tmp13;
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int z5, z10, z11, z12, z13;
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int i;
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int temp[64];
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for (i = 0; i < 8; i++) {
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tmp10 = block[8 * 0 + i] + block[8 * 4 + i];
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tmp11 = block[8 * 0 + i] - block[8 * 4 + i];
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tmp13 = block[8 * 2 + i] + block[8 * 6 + i];
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tmp12 = MULTIPLY(block[8 * 2 + i] - block[8 * 6 + i], FIX_1_414213562) - tmp13;
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tmp0 = tmp10 + tmp13;
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tmp3 = tmp10 - tmp13;
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tmp1 = tmp11 + tmp12;
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tmp2 = tmp11 - tmp12;
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z13 = block[8 * 5 + i] + block[8 * 3 + i];
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z10 = block[8 * 5 + i] - block[8 * 3 + i];
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z11 = block[8 * 1 + i] + block[8 * 7 + i];
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z12 = block[8 * 1 + i] - block[8 * 7 + i];
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tmp7 = z11 + z13;
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tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562);
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z5 = MULTIPLY(z10 + z12, FIX_1_847759065);
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tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5;
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tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5;
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tmp6 = tmp12 - tmp7;
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tmp5 = tmp11 - tmp6;
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tmp4 = tmp10 + tmp5;
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temp[8 * 0 + i] = tmp0 + tmp7;
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temp[8 * 7 + i] = tmp0 - tmp7;
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temp[8 * 1 + i] = tmp1 + tmp6;
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temp[8 * 6 + i] = tmp1 - tmp6;
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temp[8 * 2 + i] = tmp2 + tmp5;
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temp[8 * 5 + i] = tmp2 - tmp5;
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temp[8 * 4 + i] = tmp3 + tmp4;
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temp[8 * 3 + i] = tmp3 - tmp4;
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}
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for (i = 0; i < 8 * 8; i += 8) {
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tmp10 = temp[0 + i] + temp[4 + i];
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tmp11 = temp[0 + i] - temp[4 + i];
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tmp13 = temp[2 + i] + temp[6 + i];
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tmp12 = MULTIPLY(temp[2 + i] - temp[6 + i], FIX_1_414213562) - tmp13;
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tmp0 = tmp10 + tmp13;
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tmp3 = tmp10 - tmp13;
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tmp1 = tmp11 + tmp12;
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tmp2 = tmp11 - tmp12;
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z13 = temp[5 + i] + temp[3 + i];
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z10 = temp[5 + i] - temp[3 + i];
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z11 = temp[1 + i] + temp[7 + i];
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z12 = temp[1 + i] - temp[7 + i];
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tmp7 = z11 + z13;
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tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562);
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z5 = MULTIPLY(z10 + z12, FIX_1_847759065);
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tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5;
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tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5;
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tmp6 = tmp12 - tmp7;
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tmp5 = tmp11 - tmp6;
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tmp4 = tmp10 + tmp5;
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block[0 + i] = (tmp0 + tmp7) >> 6;
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block[7 + i] = (tmp0 - tmp7) >> 6;
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block[1 + i] = (tmp1 + tmp6) >> 6;
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block[6 + i] = (tmp1 - tmp6) >> 6;
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block[2 + i] = (tmp2 + tmp5) >> 6;
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block[5 + i] = (tmp2 - tmp5) >> 6;
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block[4 + i] = (tmp3 + tmp4) >> 6;
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block[3 + i] = (tmp3 - tmp4) >> 6;
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}
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}
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static av_cold void init_vlcs(FourXContext *f)
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{
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static VLC_TYPE table[2][4][32][2];
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int i, j;
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for (i = 0; i < 2; i++) {
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for (j = 0; j < 4; j++) {
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block_type_vlc[i][j].table = table[i][j];
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block_type_vlc[i][j].table_allocated = 32;
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init_vlc(&block_type_vlc[i][j], BLOCK_TYPE_VLC_BITS, 7,
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&block_type_tab[i][j][0][1], 2, 1,
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&block_type_tab[i][j][0][0], 2, 1,
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INIT_VLC_USE_NEW_STATIC);
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}
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}
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}
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static void init_mv(FourXContext *f, int linesize)
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{
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int i;
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for (i = 0; i < 256; i++) {
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if (f->version > 1)
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f->mv[i] = mv[i][0] + mv[i][1] * linesize / 2;
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else
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f->mv[i] = (i & 15) - 8 + ((i >> 4) - 8) * linesize / 2;
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}
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}
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#if HAVE_BIGENDIAN
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#define LE_CENTRIC_MUL(dst, src, scale, dc) \
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{ \
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unsigned tmpval = AV_RN32(src); \
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tmpval = (tmpval << 16) | (tmpval >> 16); \
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tmpval = tmpval * (scale) + (dc); \
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tmpval = (tmpval << 16) | (tmpval >> 16); \
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AV_WN32A(dst, tmpval); \
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}
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#else
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#define LE_CENTRIC_MUL(dst, src, scale, dc) \
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{ \
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unsigned tmpval = AV_RN32(src) * (scale) + (dc); \
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AV_WN32A(dst, tmpval); \
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}
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#endif
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static inline void mcdc(uint16_t *dst, const uint16_t *src, int log2w,
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int h, int stride, int scale, unsigned dc)
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{
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int i;
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dc *= 0x10001;
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switch (log2w) {
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case 0:
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for (i = 0; i < h; i++) {
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dst[0] = scale * src[0] + dc;
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if (scale)
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src += stride;
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dst += stride;
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}
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break;
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case 1:
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for (i = 0; i < h; i++) {
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LE_CENTRIC_MUL(dst, src, scale, dc);
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if (scale)
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src += stride;
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dst += stride;
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}
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break;
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case 2:
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for (i = 0; i < h; i++) {
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LE_CENTRIC_MUL(dst, src, scale, dc);
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LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc);
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if (scale)
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src += stride;
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dst += stride;
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}
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break;
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case 3:
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for (i = 0; i < h; i++) {
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LE_CENTRIC_MUL(dst, src, scale, dc);
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LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc);
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LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc);
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LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc);
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if (scale)
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src += stride;
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dst += stride;
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}
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break;
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default:
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av_assert0(0);
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}
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}
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static int decode_p_block(FourXContext *f, uint16_t *dst, const uint16_t *src,
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int log2w, int log2h, int stride)
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{
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int index, h, code, ret, scale = 1;
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uint16_t *start, *end;
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unsigned dc = 0;
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av_assert0(log2w >= 0 && log2h >= 0);
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index = size2index[log2h][log2w];
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av_assert0(index >= 0);
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if (get_bits_left(&f->gb) < 1)
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return AVERROR_INVALIDDATA;
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h = 1 << log2h;
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code = get_vlc2(&f->gb, block_type_vlc[1 - (f->version > 1)][index].table,
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BLOCK_TYPE_VLC_BITS, 1);
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av_assert0(code >= 0 && code <= 6);
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start = f->last_frame_buffer;
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end = start + stride * (f->avctx->height - h + 1) - (1 << log2w);
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if (code == 1) {
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log2h--;
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if ((ret = decode_p_block(f, dst, src, log2w, log2h, stride)) < 0)
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return ret;
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return decode_p_block(f, dst + (stride << log2h),
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src + (stride << log2h),
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log2w, log2h, stride);
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} else if (code == 2) {
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log2w--;
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if ((ret = decode_p_block(f, dst , src, log2w, log2h, stride)) < 0)
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return ret;
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return decode_p_block(f, dst + (1 << log2w),
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src + (1 << log2w),
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log2w, log2h, stride);
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} else if (code == 6) {
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if (bytestream2_get_bytes_left(&f->g2) < 4) {
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av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n");
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return AVERROR_INVALIDDATA;
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}
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if (log2w) {
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dst[0] = bytestream2_get_le16u(&f->g2);
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dst[1] = bytestream2_get_le16u(&f->g2);
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} else {
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dst[0] = bytestream2_get_le16u(&f->g2);
|
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dst[stride] = bytestream2_get_le16u(&f->g2);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if ((code&3)==0 && bytestream2_get_bytes_left(&f->g) < 1) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "bytestream overread\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (code == 0) {
|
|
src += f->mv[bytestream2_get_byte(&f->g)];
|
|
} else if (code == 3 && f->version >= 2) {
|
|
return 0;
|
|
} else if (code == 4) {
|
|
src += f->mv[bytestream2_get_byte(&f->g)];
|
|
if (bytestream2_get_bytes_left(&f->g2) < 2){
|
|
av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
dc = bytestream2_get_le16(&f->g2);
|
|
} else if (code == 5) {
|
|
if (bytestream2_get_bytes_left(&f->g2) < 2){
|
|
av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
av_assert0(start <= src && src <= end);
|
|
scale = 0;
|
|
dc = bytestream2_get_le16(&f->g2);
|
|
}
|
|
|
|
if (start > src || src > end) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
mcdc(dst, src, log2w, h, stride, scale, dc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_p_frame(FourXContext *f, const uint8_t *buf, int length)
|
|
{
|
|
int x, y;
|
|
const int width = f->avctx->width;
|
|
const int height = f->avctx->height;
|
|
uint16_t *dst = f->frame_buffer;
|
|
uint16_t *src;
|
|
unsigned int bitstream_size, bytestream_size, wordstream_size, extra,
|
|
bytestream_offset, wordstream_offset;
|
|
int ret;
|
|
|
|
src = f->last_frame_buffer;
|
|
|
|
if (f->version > 1) {
|
|
extra = 20;
|
|
if (length < extra)
|
|
return AVERROR_INVALIDDATA;
|
|
bitstream_size = AV_RL32(buf + 8);
|
|
wordstream_size = AV_RL32(buf + 12);
|
|
bytestream_size = AV_RL32(buf + 16);
|
|
} else {
|
|
extra = 0;
|
|
bitstream_size = AV_RL16(buf - 4);
|
|
wordstream_size = AV_RL16(buf - 2);
|
|
bytestream_size = FFMAX(length - bitstream_size - wordstream_size, 0);
|
|
}
|
|
|
|
if (bitstream_size > length || bitstream_size >= INT_MAX/8 ||
|
|
bytestream_size > length - bitstream_size ||
|
|
wordstream_size > length - bytestream_size - bitstream_size ||
|
|
extra > length - bytestream_size - bitstream_size - wordstream_size) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "lengths %d %d %d %d\n", bitstream_size, bytestream_size, wordstream_size,
|
|
bitstream_size+ bytestream_size+ wordstream_size - length);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
av_fast_padded_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size,
|
|
bitstream_size);
|
|
if (!f->bitstream_buffer)
|
|
return AVERROR(ENOMEM);
|
|
f->bbdsp.bswap_buf(f->bitstream_buffer, (const uint32_t *) (buf + extra),
|
|
bitstream_size / 4);
|
|
init_get_bits(&f->gb, f->bitstream_buffer, 8 * bitstream_size);
|
|
|
|
wordstream_offset = extra + bitstream_size;
|
|
bytestream_offset = extra + bitstream_size + wordstream_size;
|
|
bytestream2_init(&f->g2, buf + wordstream_offset,
|
|
length - wordstream_offset);
|
|
bytestream2_init(&f->g, buf + bytestream_offset,
|
|
length - bytestream_offset);
|
|
|
|
init_mv(f, width * 2);
|
|
|
|
for (y = 0; y < height; y += 8) {
|
|
for (x = 0; x < width; x += 8)
|
|
if ((ret = decode_p_block(f, dst + x, src + x, 3, 3, width)) < 0)
|
|
return ret;
|
|
src += 8 * width;
|
|
dst += 8 * width;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* decode block and dequantize.
|
|
* Note this is almost identical to MJPEG.
|
|
*/
|
|
static int decode_i_block(FourXContext *f, int16_t *block)
|
|
{
|
|
int code, i, j, level, val;
|
|
|
|
if (get_bits_left(&f->gb) < 2){
|
|
av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb));
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* DC coef */
|
|
val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3);
|
|
if (val >> 4) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (val)
|
|
val = get_xbits(&f->gb, val);
|
|
|
|
val = val * dequant_table[0] + f->last_dc;
|
|
f->last_dc = block[0] = val;
|
|
/* AC coefs */
|
|
i = 1;
|
|
for (;;) {
|
|
code = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3);
|
|
|
|
/* EOB */
|
|
if (code == 0)
|
|
break;
|
|
if (code == 0xf0) {
|
|
i += 16;
|
|
if (i >= 64) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "run %d overflow\n", i);
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (code & 0xf) {
|
|
level = get_xbits(&f->gb, code & 0xf);
|
|
} else {
|
|
av_log(f->avctx, AV_LOG_ERROR, "0 coeff\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
i += code >> 4;
|
|
if (i >= 64) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "run %d overflow\n", i);
|
|
return 0;
|
|
}
|
|
|
|
j = ff_zigzag_direct[i];
|
|
block[j] = level * dequant_table[j];
|
|
i++;
|
|
if (i >= 64)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void idct_put(FourXContext *f, int x, int y)
|
|
{
|
|
int16_t (*block)[64] = f->block;
|
|
int stride = f->avctx->width;
|
|
int i;
|
|
uint16_t *dst = f->frame_buffer + y * stride + x;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
block[i][0] += 0x80 * 8 * 8;
|
|
idct(block[i]);
|
|
}
|
|
|
|
if (!(f->avctx->flags & AV_CODEC_FLAG_GRAY)) {
|
|
for (i = 4; i < 6; i++)
|
|
idct(block[i]);
|
|
}
|
|
|
|
/* Note transform is:
|
|
* y = ( 1b + 4g + 2r) / 14
|
|
* cb = ( 3b - 2g - 1r) / 14
|
|
* cr = (-1b - 4g + 5r) / 14 */
|
|
for (y = 0; y < 8; y++) {
|
|
for (x = 0; x < 8; x++) {
|
|
int16_t *temp = block[(x >> 2) + 2 * (y >> 2)] +
|
|
2 * (x & 3) + 2 * 8 * (y & 3); // FIXME optimize
|
|
int cb = block[4][x + 8 * y];
|
|
int cr = block[5][x + 8 * y];
|
|
int cg = (cb + cr) >> 1;
|
|
int y;
|
|
|
|
cb += cb;
|
|
|
|
y = temp[0];
|
|
dst[0] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8);
|
|
y = temp[1];
|
|
dst[1] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8);
|
|
y = temp[8];
|
|
dst[stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8);
|
|
y = temp[9];
|
|
dst[1 + stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8);
|
|
dst += 2;
|
|
}
|
|
dst += 2 * stride - 2 * 8;
|
|
}
|
|
}
|
|
|
|
static int decode_i_mb(FourXContext *f)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
f->bdsp.clear_blocks(f->block[0]);
|
|
|
|
for (i = 0; i < 6; i++)
|
|
if ((ret = decode_i_block(f, f->block[i])) < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const uint8_t *read_huffman_tables(FourXContext *f,
|
|
const uint8_t * const buf,
|
|
int buf_size)
|
|
{
|
|
int frequency[512] = { 0 };
|
|
uint8_t flag[512];
|
|
int up[512];
|
|
uint8_t len_tab[257];
|
|
int bits_tab[257];
|
|
int start, end;
|
|
const uint8_t *ptr = buf;
|
|
const uint8_t *ptr_end = buf + buf_size;
|
|
int j;
|
|
|
|
memset(up, -1, sizeof(up));
|
|
|
|
start = *ptr++;
|
|
end = *ptr++;
|
|
for (;;) {
|
|
int i;
|
|
|
|
if (ptr_end - ptr < FFMAX(end - start + 1, 0) + 1) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "invalid data in read_huffman_tables\n");
|
|
return NULL;
|
|
}
|
|
|
|
for (i = start; i <= end; i++)
|
|
frequency[i] = *ptr++;
|
|
start = *ptr++;
|
|
if (start == 0)
|
|
break;
|
|
|
|
end = *ptr++;
|
|
}
|
|
frequency[256] = 1;
|
|
|
|
while ((ptr - buf) & 3)
|
|
ptr++; // 4byte align
|
|
|
|
if (ptr > ptr_end) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "ptr overflow in read_huffman_tables\n");
|
|
return NULL;
|
|
}
|
|
|
|
for (j = 257; j < 512; j++) {
|
|
int min_freq[2] = { 256 * 256, 256 * 256 };
|
|
int smallest[2] = { 0, 0 };
|
|
int i;
|
|
for (i = 0; i < j; i++) {
|
|
if (frequency[i] == 0)
|
|
continue;
|
|
if (frequency[i] < min_freq[1]) {
|
|
if (frequency[i] < min_freq[0]) {
|
|
min_freq[1] = min_freq[0];
|
|
smallest[1] = smallest[0];
|
|
min_freq[0] = frequency[i];
|
|
smallest[0] = i;
|
|
} else {
|
|
min_freq[1] = frequency[i];
|
|
smallest[1] = i;
|
|
}
|
|
}
|
|
}
|
|
if (min_freq[1] == 256 * 256)
|
|
break;
|
|
|
|
frequency[j] = min_freq[0] + min_freq[1];
|
|
flag[smallest[0]] = 0;
|
|
flag[smallest[1]] = 1;
|
|
up[smallest[0]] =
|
|
up[smallest[1]] = j;
|
|
frequency[smallest[0]] = frequency[smallest[1]] = 0;
|
|
}
|
|
|
|
for (j = 0; j < 257; j++) {
|
|
int node, len = 0, bits = 0;
|
|
|
|
for (node = j; up[node] != -1; node = up[node]) {
|
|
bits += flag[node] << len;
|
|
len++;
|
|
if (len > 31)
|
|
// can this happen at all ?
|
|
av_log(f->avctx, AV_LOG_ERROR,
|
|
"vlc length overflow\n");
|
|
}
|
|
|
|
bits_tab[j] = bits;
|
|
len_tab[j] = len;
|
|
}
|
|
|
|
ff_free_vlc(&f->pre_vlc);
|
|
if (init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257, len_tab, 1, 1,
|
|
bits_tab, 4, 4, 0))
|
|
return NULL;
|
|
|
|
return ptr;
|
|
}
|
|
|
|
static int mix(int c0, int c1)
|
|
{
|
|
int blue = 2 * (c0 & 0x001F) + (c1 & 0x001F);
|
|
int green = (2 * (c0 & 0x03E0) + (c1 & 0x03E0)) >> 5;
|
|
int red = 2 * (c0 >> 10) + (c1 >> 10);
|
|
return red / 3 * 1024 + green / 3 * 32 + blue / 3;
|
|
}
|
|
|
|
static int decode_i2_frame(FourXContext *f, const uint8_t *buf, int length)
|
|
{
|
|
int x, y, x2, y2;
|
|
const int width = f->avctx->width;
|
|
const int height = f->avctx->height;
|
|
const int mbs = (FFALIGN(width, 16) >> 4) * (FFALIGN(height, 16) >> 4);
|
|
uint16_t *dst = f->frame_buffer;
|
|
const uint8_t *buf_end = buf + length;
|
|
GetByteContext g3;
|
|
|
|
if (length < mbs * 8) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
bytestream2_init(&g3, buf, length);
|
|
|
|
for (y = 0; y < height; y += 16) {
|
|
for (x = 0; x < width; x += 16) {
|
|
unsigned int color[4] = { 0 }, bits;
|
|
if (buf_end - buf < 8)
|
|
return AVERROR_INVALIDDATA;
|
|
// warning following is purely guessed ...
|
|
color[0] = bytestream2_get_le16u(&g3);
|
|
color[1] = bytestream2_get_le16u(&g3);
|
|
|
|
if (color[0] & 0x8000)
|
|
av_log(f->avctx, AV_LOG_ERROR, "unk bit 1\n");
|
|
if (color[1] & 0x8000)
|
|
av_log(f->avctx, AV_LOG_ERROR, "unk bit 2\n");
|
|
|
|
color[2] = mix(color[0], color[1]);
|
|
color[3] = mix(color[1], color[0]);
|
|
|
|
bits = bytestream2_get_le32u(&g3);
|
|
for (y2 = 0; y2 < 16; y2++) {
|
|
for (x2 = 0; x2 < 16; x2++) {
|
|
int index = 2 * (x2 >> 2) + 8 * (y2 >> 2);
|
|
dst[y2 * width + x2] = color[(bits >> index) & 3];
|
|
}
|
|
}
|
|
dst += 16;
|
|
}
|
|
dst += 16 * width - x;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_i_frame(FourXContext *f, const uint8_t *buf, int length)
|
|
{
|
|
int x, y, ret;
|
|
const int width = f->avctx->width;
|
|
const int height = f->avctx->height;
|
|
const unsigned int bitstream_size = AV_RL32(buf);
|
|
unsigned int prestream_size;
|
|
const uint8_t *prestream;
|
|
|
|
if (bitstream_size > (1 << 26))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (length < bitstream_size + 12) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
prestream_size = 4 * AV_RL32(buf + bitstream_size + 4);
|
|
prestream = buf + bitstream_size + 12;
|
|
|
|
if (prestream_size + bitstream_size + 12 != length
|
|
|| prestream_size > (1 << 26)) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d %d\n",
|
|
prestream_size, bitstream_size, length);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
prestream = read_huffman_tables(f, prestream, prestream_size);
|
|
if (!prestream) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "Error reading Huffman tables.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
av_assert0(prestream <= buf + length);
|
|
|
|
init_get_bits(&f->gb, buf + 4, 8 * bitstream_size);
|
|
|
|
prestream_size = length + buf - prestream;
|
|
|
|
av_fast_padded_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size,
|
|
prestream_size);
|
|
if (!f->bitstream_buffer)
|
|
return AVERROR(ENOMEM);
|
|
f->bbdsp.bswap_buf(f->bitstream_buffer, (const uint32_t *) prestream,
|
|
prestream_size / 4);
|
|
init_get_bits(&f->pre_gb, f->bitstream_buffer, 8 * prestream_size);
|
|
|
|
f->last_dc = 0 * 128 * 8 * 8;
|
|
|
|
for (y = 0; y < height; y += 16) {
|
|
for (x = 0; x < width; x += 16) {
|
|
if ((ret = decode_i_mb(f)) < 0)
|
|
return ret;
|
|
|
|
idct_put(f, x, y);
|
|
}
|
|
}
|
|
|
|
if (get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3) != 256)
|
|
av_log(f->avctx, AV_LOG_ERROR, "end mismatch\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
FourXContext *const f = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
int i, frame_4cc, frame_size, ret;
|
|
|
|
if (buf_size < 20)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
av_assert0(avctx->width % 16 == 0 && avctx->height % 16 == 0);
|
|
|
|
if (buf_size < AV_RL32(buf + 4) + 8) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %"PRIu32"\n",
|
|
buf_size, AV_RL32(buf + 4));
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
frame_4cc = AV_RL32(buf);
|
|
|
|
if (frame_4cc == AV_RL32("cfrm")) {
|
|
int free_index = -1;
|
|
int id, whole_size;
|
|
const int data_size = buf_size - 20;
|
|
CFrameBuffer *cfrm;
|
|
|
|
if (f->version <= 1) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "cfrm in version %d\n", f->version);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
id = AV_RL32(buf + 12);
|
|
whole_size = AV_RL32(buf + 16);
|
|
|
|
if (data_size < 0 || whole_size < 0) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "sizes invalid\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
for (i = 0; i < CFRAME_BUFFER_COUNT; i++)
|
|
if (f->cfrm[i].id && f->cfrm[i].id < avctx->frame_number)
|
|
av_log(f->avctx, AV_LOG_ERROR, "lost c frame %d\n",
|
|
f->cfrm[i].id);
|
|
|
|
for (i = 0; i < CFRAME_BUFFER_COUNT; i++) {
|
|
if (f->cfrm[i].id == id)
|
|
break;
|
|
if (f->cfrm[i].size == 0)
|
|
free_index = i;
|
|
}
|
|
|
|
if (i >= CFRAME_BUFFER_COUNT) {
|
|
i = free_index;
|
|
f->cfrm[i].id = id;
|
|
}
|
|
cfrm = &f->cfrm[i];
|
|
|
|
if (data_size > UINT_MAX - cfrm->size - AV_INPUT_BUFFER_PADDING_SIZE)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
cfrm->data = av_fast_realloc(cfrm->data, &cfrm->allocated_size,
|
|
cfrm->size + data_size + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
// explicit check needed as memcpy below might not catch a NULL
|
|
if (!cfrm->data) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "realloc failure\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
memcpy(cfrm->data + cfrm->size, buf + 20, data_size);
|
|
cfrm->size += data_size;
|
|
|
|
if (cfrm->size >= whole_size) {
|
|
buf = cfrm->data;
|
|
frame_size = cfrm->size;
|
|
|
|
if (id != avctx->frame_number)
|
|
av_log(f->avctx, AV_LOG_ERROR, "cframe id mismatch %d %d\n",
|
|
id, avctx->frame_number);
|
|
|
|
if (f->version <= 1)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
cfrm->size = cfrm->id = 0;
|
|
frame_4cc = AV_RL32("pfrm");
|
|
} else
|
|
return buf_size;
|
|
} else {
|
|
buf = buf + 12;
|
|
frame_size = buf_size - 12;
|
|
}
|
|
|
|
if ((ret = ff_get_buffer(avctx, picture, 0)) < 0)
|
|
return ret;
|
|
|
|
if (frame_4cc == AV_RL32("ifr2")) {
|
|
picture->pict_type = AV_PICTURE_TYPE_I;
|
|
if ((ret = decode_i2_frame(f, buf - 4, frame_size + 4)) < 0) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "decode i2 frame failed\n");
|
|
return ret;
|
|
}
|
|
} else if (frame_4cc == AV_RL32("ifrm")) {
|
|
picture->pict_type = AV_PICTURE_TYPE_I;
|
|
if ((ret = decode_i_frame(f, buf, frame_size)) < 0) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "decode i frame failed\n");
|
|
return ret;
|
|
}
|
|
} else if (frame_4cc == AV_RL32("pfrm") || frame_4cc == AV_RL32("pfr2")) {
|
|
picture->pict_type = AV_PICTURE_TYPE_P;
|
|
if ((ret = decode_p_frame(f, buf, frame_size)) < 0) {
|
|
av_log(f->avctx, AV_LOG_ERROR, "decode p frame failed\n");
|
|
return ret;
|
|
}
|
|
} else if (frame_4cc == AV_RL32("snd_")) {
|
|
av_log(avctx, AV_LOG_ERROR, "ignoring snd_ chunk length:%d\n",
|
|
buf_size);
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR, "ignoring unknown chunk length:%d\n",
|
|
buf_size);
|
|
}
|
|
|
|
picture->key_frame = picture->pict_type == AV_PICTURE_TYPE_I;
|
|
|
|
av_image_copy_plane(picture->data[0], picture->linesize[0],
|
|
(const uint8_t*)f->frame_buffer, avctx->width * 2,
|
|
avctx->width * 2, avctx->height);
|
|
FFSWAP(uint16_t *, f->frame_buffer, f->last_frame_buffer);
|
|
|
|
*got_frame = 1;
|
|
|
|
emms_c();
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
FourXContext * const f = avctx->priv_data;
|
|
int i;
|
|
|
|
av_freep(&f->frame_buffer);
|
|
av_freep(&f->last_frame_buffer);
|
|
av_freep(&f->bitstream_buffer);
|
|
f->bitstream_buffer_size = 0;
|
|
for (i = 0; i < CFRAME_BUFFER_COUNT; i++) {
|
|
av_freep(&f->cfrm[i].data);
|
|
f->cfrm[i].allocated_size = 0;
|
|
}
|
|
ff_free_vlc(&f->pre_vlc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
FourXContext * const f = avctx->priv_data;
|
|
int ret;
|
|
|
|
if (avctx->extradata_size != 4 || !avctx->extradata) {
|
|
av_log(avctx, AV_LOG_ERROR, "extradata wrong or missing\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if((avctx->width % 16) || (avctx->height % 16)) {
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported width/height\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
f->frame_buffer = av_mallocz(avctx->width * avctx->height * 2);
|
|
f->last_frame_buffer = av_mallocz(avctx->width * avctx->height * 2);
|
|
if (!f->frame_buffer || !f->last_frame_buffer) {
|
|
decode_end(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
f->version = AV_RL32(avctx->extradata) >> 16;
|
|
ff_blockdsp_init(&f->bdsp, avctx);
|
|
ff_bswapdsp_init(&f->bbdsp);
|
|
f->avctx = avctx;
|
|
init_vlcs(f);
|
|
|
|
if (f->version > 2)
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB565;
|
|
else
|
|
avctx->pix_fmt = AV_PIX_FMT_BGR555;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_fourxm_decoder = {
|
|
.name = "4xm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("4X Movie"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_4XM,
|
|
.priv_data_size = sizeof(FourXContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|