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FFmpeg/libavcodec/mobiclip.c
Andreas Rheinhardt d6c16c5217 avcodec/mobiclip: Rewrite code to make it clearer 
In order to know that the earlier code did not use uninitialized
values one needs to know that the lowest four bits of each used
value of pframe_block4x4_coefficients_tab do not vanish identically.
E.g. Coverity did not get this and warned about it in ticket #1466632.
Fix this by slightly rewriting the code.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-11-28 06:59:56 +01:00

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/*
* MobiClip Video decoder
* Copyright (c) 2015-2016 Florian Nouwt
* Copyright (c) 2017 Adib Surani
* Copyright (c) 2020 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
#include "libavutil/avassert.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "bytestream.h"
#include "bswapdsp.h"
#include "get_bits.h"
#include "golomb.h"
#include "internal.h"
#define MOBI_RL_VLC_BITS 12
#define MOBI_MV_VLC_BITS 6
static const uint8_t zigzag4x4_tab[] =
{
0x00, 0x04, 0x01, 0x02, 0x05, 0x08, 0x0C, 0x09, 0x06, 0x03, 0x07, 0x0A,
0x0D, 0x0E, 0x0B, 0x0F
};
static const uint8_t quant4x4_tab[][16] =
{
{ 10, 13, 13, 10, 16, 10, 13, 13, 13, 13, 16, 10, 16, 13, 13, 16 },
{ 11, 14, 14, 11, 18, 11, 14, 14, 14, 14, 18, 11, 18, 14, 14, 18 },
{ 13, 16, 16, 13, 20, 13, 16, 16, 16, 16, 20, 13, 20, 16, 16, 20 },
{ 14, 18, 18, 14, 23, 14, 18, 18, 18, 18, 23, 14, 23, 18, 18, 23 },
{ 16, 20, 20, 16, 25, 16, 20, 20, 20, 20, 25, 16, 25, 20, 20, 25 },
{ 18, 23, 23, 18, 29, 18, 23, 23, 23, 23, 29, 18, 29, 23, 23, 29 },
};
static const uint8_t quant8x8_tab[][64] =
{
{ 20, 19, 19, 25, 18, 25, 19, 24, 24, 19, 20, 18, 32, 18, 20, 19, 19, 24, 24, 19, 19, 25, 18, 25, 18, 25, 18, 25, 19, 24, 24, 19,
19, 24, 24, 19, 18, 32, 18, 20, 18, 32, 18, 24, 24, 19, 19, 24, 24, 18, 25, 18, 25, 18, 19, 24, 24, 19, 18, 32, 18, 24, 24, 18,},
{ 22, 21, 21, 28, 19, 28, 21, 26, 26, 21, 22, 19, 35, 19, 22, 21, 21, 26, 26, 21, 21, 28, 19, 28, 19, 28, 19, 28, 21, 26, 26, 21,
21, 26, 26, 21, 19, 35, 19, 22, 19, 35, 19, 26, 26, 21, 21, 26, 26, 19, 28, 19, 28, 19, 21, 26, 26, 21, 19, 35, 19, 26, 26, 19,},
{ 26, 24, 24, 33, 23, 33, 24, 31, 31, 24, 26, 23, 42, 23, 26, 24, 24, 31, 31, 24, 24, 33, 23, 33, 23, 33, 23, 33, 24, 31, 31, 24,
24, 31, 31, 24, 23, 42, 23, 26, 23, 42, 23, 31, 31, 24, 24, 31, 31, 23, 33, 23, 33, 23, 24, 31, 31, 24, 23, 42, 23, 31, 31, 23,},
{ 28, 26, 26, 35, 25, 35, 26, 33, 33, 26, 28, 25, 45, 25, 28, 26, 26, 33, 33, 26, 26, 35, 25, 35, 25, 35, 25, 35, 26, 33, 33, 26,
26, 33, 33, 26, 25, 45, 25, 28, 25, 45, 25, 33, 33, 26, 26, 33, 33, 25, 35, 25, 35, 25, 26, 33, 33, 26, 25, 45, 25, 33, 33, 25,},
{ 32, 30, 30, 40, 28, 40, 30, 38, 38, 30, 32, 28, 51, 28, 32, 30, 30, 38, 38, 30, 30, 40, 28, 40, 28, 40, 28, 40, 30, 38, 38, 30,
30, 38, 38, 30, 28, 51, 28, 32, 28, 51, 28, 38, 38, 30, 30, 38, 38, 28, 40, 28, 40, 28, 30, 38, 38, 30, 28, 51, 28, 38, 38, 28,},
{ 36, 34, 34, 46, 32, 46, 34, 43, 43, 34, 36, 32, 58, 32, 36, 34, 34, 43, 43, 34, 34, 46, 32, 46, 32, 46, 32, 46, 34, 43, 43, 34,
34, 43, 43, 34, 32, 58, 32, 36, 32, 58, 32, 43, 43, 34, 34, 43, 43, 32, 46, 32, 46, 32, 34, 43, 43, 34, 32, 58, 32, 43, 43, 32,},
};
static const uint8_t block4x4_coefficients_tab[] =
{
15, 0, 2, 1, 4, 8, 12, 3, 11, 13, 14, 7, 10, 5, 9, 6,
};
static const uint8_t pframe_block4x4_coefficients_tab[] =
{
0, 4, 1, 8, 2, 12, 3, 5, 10, 15, 7, 13, 14, 11, 9, 6,
};
static const uint8_t block8x8_coefficients_tab[] =
{
0x00, 0x1F, 0x3F, 0x0F, 0x08, 0x04, 0x02, 0x01, 0x0B, 0x0E, 0x1B, 0x0D,
0x03, 0x07, 0x0C, 0x17, 0x1D, 0x0A, 0x1E, 0x05, 0x10, 0x2F, 0x37, 0x3B,
0x13, 0x3D, 0x3E, 0x09, 0x1C, 0x06, 0x15, 0x1A, 0x33, 0x11, 0x12, 0x14,
0x18, 0x20, 0x3C, 0x35, 0x19, 0x16, 0x3A, 0x30, 0x31, 0x32, 0x27, 0x34,
0x2B, 0x2D, 0x39, 0x38, 0x23, 0x36, 0x2E, 0x21, 0x25, 0x22, 0x24, 0x2C,
0x2A, 0x28, 0x29, 0x26,
};
static const uint8_t pframe_block8x8_coefficients_tab[] =
{
0x00, 0x0F, 0x04, 0x01, 0x08, 0x02, 0x0C, 0x03, 0x05, 0x0A, 0x0D, 0x07, 0x0E, 0x0B, 0x1F, 0x09,
0x06, 0x10, 0x3F, 0x1E, 0x17, 0x1D, 0x1B, 0x1C, 0x13, 0x18, 0x1A, 0x12, 0x11, 0x14, 0x15, 0x20,
0x2F, 0x16, 0x19, 0x37, 0x3D, 0x3E, 0x3B, 0x3C, 0x33, 0x35, 0x21, 0x24, 0x22, 0x28, 0x23, 0x2C,
0x30, 0x27, 0x2D, 0x25, 0x3A, 0x2B, 0x2E, 0x2A, 0x31, 0x34, 0x38, 0x32, 0x29, 0x26, 0x39, 0x36
};
static const uint8_t run_residue[2][256] =
{
{
12, 6, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 27, 11, 7, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 41, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
},
{
27, 10, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
8, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 15, 10, 8, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 21, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
},
};
static const uint8_t bits0[] = {
9, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 7, 10, 10, 9,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 2, 3, 4, 4,
};
static const uint16_t syms0[] = {
0x0, 0x822, 0x803, 0xB, 0xA, 0xB81, 0xB61, 0xB41, 0xB21, 0x122,
0x102, 0xE2, 0xC2, 0xA2, 0x63, 0x43, 0x24, 0xC, 0x25, 0x2E1, 0x301,
0xBA1, 0xBC1, 0xBE1, 0xC01, 0x26, 0x44, 0x83, 0xA3, 0xC3, 0x142,
0x321, 0x341, 0xC21, 0xC41, 0xC61, 0xC81, 0xCA1, 0xCC1, 0xCE1, 0xD01,
0x0, 0x9, 0x8, 0xB01, 0xAE1, 0xAC1, 0xAA1, 0xA81, 0xA61, 0xA41, 0xA21,
0x802, 0x2C1, 0x2A1, 0x281, 0x261, 0x241, 0x221, 0x201, 0x1E1, 0x82,
0x62, 0x7, 0x6, 0xA01, 0x9E1, 0x9C1, 0x9A1, 0x981, 0x961, 0x941, 0x921,
0x1C1, 0x1A1, 0x42, 0x23, 0x5, 0x901, 0x8E1, 0x8C1, 0x8A1, 0x181, 0x161,
0x141, 0x4, 0x881, 0x861, 0x841, 0x821, 0x121, 0x101, 0xE1, 0xC1, 0x22,
0x3, 0xA1, 0x81, 0x61, 0x801, 0x1, 0x21, 0x41, 0x2,
};
static const uint16_t syms1[] = {
0x0, 0x807, 0x806, 0x16, 0x15, 0x842, 0x823, 0x805, 0x1A1, 0xA3, 0x102, 0x83,
0x64, 0x44, 0x27, 0x14, 0x13, 0x17, 0x18, 0x28, 0x122, 0x862, 0x882, 0x9E1, 0xA01,
0x19, 0x1A, 0x1B, 0x29, 0xC3, 0x2A, 0x45, 0xE3, 0x1C1, 0x808, 0x8A2, 0x8C2, 0xA21,
0xA41, 0xA61, 0xA81, 0x0, 0x12, 0x11, 0x9C1, 0x9A1, 0x981, 0x961, 0x941, 0x822, 0x804,
0x181, 0x161, 0xE2, 0xC2, 0xA2, 0x63, 0x43, 0x26, 0x25, 0x10, 0x82, 0xF, 0xE, 0xD, 0x901,
0x8E1, 0x8C1, 0x803, 0x141, 0x121, 0x101, 0x921, 0x62, 0x24, 0xC, 0xB, 0xA, 0x881, 0x861,
0xC1, 0x8A1, 0xE1, 0x42, 0x23, 0x9, 0x802, 0xA1, 0x841, 0x821, 0x81, 0x61, 0x8, 0x7, 0x22,
0x6, 0x41, 0x5, 0x4, 0x801, 0x1, 0x2, 0x21, 0x3,
};
static const uint8_t mv_len[16] =
{
10, 8, 8, 7, 8, 8, 8, 7, 8, 8, 8, 7, 7, 7, 7, 6,
};
static const uint8_t mv_bits[2][16][10] =
{
{
{ 2, 3, 3, 5, 5, 4, 4, 5, 5, 2 },
{ 2, 3, 4, 4, 3, 4, 4, 2 },
{ 3, 4, 4, 2, 4, 4, 3, 2 },
{ 1, 3, 4, 5, 5, 3, 3 },
{ 2, 4, 4, 3, 3, 4, 4, 2 },
{ 2, 3, 4, 4, 4, 4, 3, 2 },
{ 2, 3, 4, 4, 4, 4, 3, 2 },
{ 2, 2, 3, 4, 5, 5, 2 },
{ 2, 3, 4, 4, 3, 4, 4, 2 },
{ 2, 4, 4, 3, 4, 4, 3, 2 },
{ 2, 3, 3, 5, 5, 4, 3, 2 },
{ 2, 3, 4, 4, 3, 3, 2 },
{ 1, 4, 4, 3, 3, 4, 4 },
{ 2, 3, 4, 4, 3, 3, 2 },
{ 2, 3, 4, 4, 3, 3, 2 },
{ 3, 3, 2, 2, 3, 3 },
},
{
{ 3, 4, 5, 5, 3, 5, 6, 6, 4, 1 },
{ 2, 3, 4, 5, 5, 2, 3, 3 },
{ 2, 4, 4, 3, 3, 4, 4, 2 },
{ 1, 4, 4, 3, 4, 4, 3 },
{ 3, 3, 2, 4, 5, 5, 3, 2 },
{ 3, 4, 4, 3, 3, 3, 3, 2 },
{ 1, 3, 3, 4, 4, 4, 5, 5 },
{ 1, 4, 4, 3, 3, 4, 4 },
{ 2, 4, 4, 3, 3, 4, 4, 2 },
{ 1, 3, 3, 4, 4, 4, 5, 5 },
{ 2, 3, 4, 4, 4, 4, 3, 2 },
{ 2, 3, 3, 4, 4, 3, 2 },
{ 1, 4, 4, 3, 3, 4, 4 },
{ 1, 4, 4, 3, 3, 4, 4 },
{ 2, 3, 3, 4, 4, 3, 2 },
{ 2, 3, 3, 3, 3, 2 },
}
};
static const uint8_t mv_syms[2][16][10] =
{
{
{ 1, 8, 9, 4, 3, 2, 7, 5, 6, 0 },
{ 0, 9, 5, 4, 2, 3, 8, 1 },
{ 3, 9, 5, 0, 4, 8, 2, 1 },
{ 1, 3, 4, 8, 5, 2, 0 },
{ 0, 5, 4, 8, 2, 3, 9, 1 },
{ 0, 3, 5, 9, 4, 8, 2, 1 },
{ 0, 3, 9, 5, 8, 4, 2, 1 },
{ 0, 2, 3, 4, 8, 5, 1 },
{ 0, 3, 8, 4, 2, 5, 9, 1 },
{ 2, 8, 9, 3, 5, 4, 0, 1 },
{ 0, 4, 3, 8, 9, 5, 2, 1 },
{ 0, 4, 8, 5, 3, 2, 1 },
{ 1, 9, 4, 2, 0, 5, 3 },
{ 2, 4, 9, 5, 3, 0, 1 },
{ 0, 4, 9, 5, 3, 2, 1 },
{ 5, 4, 1, 0, 3, 2 },
},
{
{ 8, 2, 3, 6, 1, 7, 5, 4, 9, 0 },
{ 9, 2, 3, 5, 4, 1, 8, 0 },
{ 0, 5, 4, 2, 9, 3, 8, 1 },
{ 1, 5, 4, 2, 8, 3, 0 },
{ 2, 9, 8, 3, 5, 4, 0, 1 },
{ 3, 5, 4, 2, 9, 8, 0, 1 },
{ 1, 2, 0, 9, 8, 3, 5, 4 },
{ 1, 8, 5, 2, 0, 4, 3 },
{ 0, 5, 4, 2, 8, 3, 9, 1 },
{ 1, 2, 0, 9, 8, 3, 5, 4 },
{ 0, 3, 9, 8, 5, 4, 2, 1 },
{ 0, 4, 3, 8, 5, 2, 1 },
{ 1, 5, 4, 2, 0, 9, 3 },
{ 1, 9, 5, 2, 0, 4, 3 },
{ 0, 5, 3, 9, 4, 2, 1 },
{ 0, 4, 5, 3, 2, 1 },
}
};
typedef struct BlockXY {
int w, h;
int ax, ay;
int x, y;
int size;
uint8_t *block;
int linesize;
} BlockXY;
typedef struct MotionXY {
int x, y;
} MotionXY;
typedef struct MobiClipContext {
AVFrame *pic[6];
int current_pic;
int moflex;
int dct_tab_idx;
int quantizer;
GetBitContext gb;
uint8_t *bitstream;
int bitstream_size;
int qtab[2][64];
uint8_t pre[32];
MotionXY *motion;
int motion_size;
BswapDSPContext bdsp;
} MobiClipContext;
static VLC rl_vlc[2];
static VLC mv_vlc[2][16];
static av_cold void mobiclip_init_static(void)
{
INIT_VLC_STATIC_FROM_LENGTHS(&rl_vlc[0], MOBI_RL_VLC_BITS, 104,
bits0, sizeof(*bits0),
syms0, sizeof(*syms0), sizeof(*syms0),
0, 0, 1 << MOBI_RL_VLC_BITS);
INIT_VLC_STATIC_FROM_LENGTHS(&rl_vlc[1], MOBI_RL_VLC_BITS, 104,
bits0, sizeof(*bits0),
syms1, sizeof(*syms1), sizeof(*syms1),
0, 0, 1 << MOBI_RL_VLC_BITS);
for (int i = 0; i < 2; i++) {
static VLC_TYPE vlc_buf[2 * 16 << MOBI_MV_VLC_BITS][2];
for (int j = 0; j < 16; j++) {
mv_vlc[i][j].table = &vlc_buf[(16 * i + j) << MOBI_MV_VLC_BITS];
mv_vlc[i][j].table_allocated = 1 << MOBI_MV_VLC_BITS;
ff_init_vlc_from_lengths(&mv_vlc[i][j], MOBI_MV_VLC_BITS, mv_len[j],
mv_bits[i][j], sizeof(*mv_bits[i][j]),
mv_syms[i][j], sizeof(*mv_syms[i][j]), sizeof(*mv_syms[i][j]),
0, INIT_VLC_USE_NEW_STATIC, NULL);
}
}
}
static av_cold int mobiclip_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
MobiClipContext *s = avctx->priv_data;
if (avctx->width & 15 || avctx->height & 15) {
av_log(avctx, AV_LOG_ERROR, "width/height not multiple of 16\n");
return AVERROR_INVALIDDATA;
}
ff_bswapdsp_init(&s->bdsp);
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
s->motion = av_calloc(avctx->width / 16 + 3, sizeof(MotionXY));
if (!s->motion)
return AVERROR(ENOMEM);
s->motion_size = (avctx->width / 16 + 3) * sizeof(MotionXY);
for (int i = 0; i < 6; i++) {
s->pic[i] = av_frame_alloc();
if (!s->pic[i])
return AVERROR(ENOMEM);
}
ff_thread_once(&init_static_once, mobiclip_init_static);
return 0;
}
static int setup_qtables(AVCodecContext *avctx, int quantizer)
{
MobiClipContext *s = avctx->priv_data;
int qx, qy;
if (quantizer < 12 || quantizer > 161)
return AVERROR_INVALIDDATA;
s->quantizer = quantizer;
qx = quantizer % 6;
qy = quantizer / 6;
for (int i = 0; i < 16; i++)
s->qtab[0][i] = quant4x4_tab[qx][i] << qy;
for (int i = 0; i < 64; i++)
s->qtab[1][i] = quant8x8_tab[qx][i] << (qy - 2);
for (int i = 0; i < 20; i++)
s->pre[i] = 9;
return 0;
}
static void inverse4(unsigned *rs)
{
unsigned a = rs[0] + rs[2];
unsigned b = rs[0] - rs[2];
unsigned c = rs[1] + ((int)rs[3] >> 1);
unsigned d = ((int)rs[1] >> 1) - rs[3];
rs[0] = a + c;
rs[1] = b + d;
rs[2] = b - d;
rs[3] = a - c;
}
static void idct(int *arr, int size)
{
int e, f, g, h;
unsigned x3, x2, x1, x0;
int tmp[4];
if (size == 4) {
inverse4(arr);
return;
}
tmp[0] = arr[0];
tmp[1] = arr[2];
tmp[2] = arr[4];
tmp[3] = arr[6];
inverse4(tmp);
e = (unsigned)arr[7] + arr[1] - arr[3] - (arr[3] >> 1);
f = (unsigned)arr[7] - arr[1] + arr[5] + (arr[5] >> 1);
g = (unsigned)arr[5] - arr[3] - arr[7] - (arr[7] >> 1);
h = (unsigned)arr[5] + arr[3] + arr[1] + (arr[1] >> 1);
x3 = (unsigned)g + (h >> 2);
x2 = (unsigned)e + (f >> 2);
x1 = (e >> 2) - (unsigned)f;
x0 = (unsigned)h - (g >> 2);
arr[0] = tmp[0] + x0;
arr[1] = tmp[1] + x1;
arr[2] = tmp[2] + x2;
arr[3] = tmp[3] + x3;
arr[4] = tmp[3] - x3;
arr[5] = tmp[2] - x2;
arr[6] = tmp[1] - x1;
arr[7] = tmp[0] - x0;
}
static void read_run_encoding(AVCodecContext *avctx,
int *last, int *run, int *level)
{
MobiClipContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
int n = get_vlc2(gb, rl_vlc[s->dct_tab_idx].table,
MOBI_RL_VLC_BITS, 1);
*last = (n >> 11) == 1;
*run = (n >> 5) & 0x3F;
*level = n & 0x1F;
}
static int add_coefficients(AVCodecContext *avctx, AVFrame *frame,
int bx, int by, int size, int plane)
{
MobiClipContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
int mat[64] = { 0 };
const uint8_t *ztab = size == 8 ? ff_zigzag_direct : zigzag4x4_tab;
const int *qtab = s->qtab[size == 8];
uint8_t *dst = frame->data[plane] + by * frame->linesize[plane] + bx;
for (int pos = 0; get_bits_left(gb) > 0; pos++) {
int qval, last, run, level;
read_run_encoding(avctx, &last, &run, &level);
if (level) {
if (get_bits1(gb))
level = -level;
} else if (!get_bits1(gb)) {
read_run_encoding(avctx, &last, &run, &level);
level += run_residue[s->dct_tab_idx][(last ? 64 : 0) + run];
if (get_bits1(gb))
level = -level;
} else if (!get_bits1(gb)) {
read_run_encoding(avctx, &last, &run, &level);
run += run_residue[s->dct_tab_idx][128 + (last ? 64 : 0) + level];
if (get_bits1(gb))
level = -level;
} else {
last = get_bits1(gb);
run = get_bits(gb, 6);
level = get_sbits(gb, 12);
}
pos += run;
if (pos >= size * size)
return AVERROR_INVALIDDATA;
qval = qtab[pos];
mat[ztab[pos]] = qval *(unsigned)level;
if (last)
break;
}
mat[0] += 32;
for (int y = 0; y < size; y++)
idct(&mat[y * size], size);
for (int y = 0; y < size; y++) {
for (int x = y + 1; x < size; x++) {
int a = mat[x * size + y];
int b = mat[y * size + x];
mat[y * size + x] = a;
mat[x * size + y] = b;
}
idct(&mat[y * size], size);
for (int x = 0; x < size; x++)
dst[x] = av_clip_uint8(dst[x] + (mat[y * size + x] >> 6));
dst += frame->linesize[plane];
}
return 0;
}
static int add_pframe_coefficients(AVCodecContext *avctx, AVFrame *frame,
int bx, int by, int size, int plane)
{
MobiClipContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
int ret, idx = get_ue_golomb_31(gb);
if (idx == 0) {
return add_coefficients(avctx, frame, bx, by, size, plane);
} else if ((unsigned)idx < FF_ARRAY_ELEMS(pframe_block4x4_coefficients_tab)) {
int flags = pframe_block4x4_coefficients_tab[idx];
for (int y = by; y < by + 8; y += 4) {
for (int x = bx; x < bx + 8; x += 4) {
if (flags & 1) {
ret = add_coefficients(avctx, frame, x, y, 4, plane);
if (ret < 0)
return ret;
}
flags >>= 1;
}
}
return 0;
} else {
return AVERROR_INVALIDDATA;
}
}
static int adjust(int x, int size)
{
return size == 16 ? (x + 1) >> 1 : x;
}
static uint8_t pget(BlockXY b)
{
BlockXY ret = b;
int x, y;
if (b.x == -1 && b.y >= b.size) {
ret.x = -1, ret.y = b.size - 1;
} else if (b.x >= -1 && b.y >= -1) {
ret.x = b.x, ret.y = b.y;
} else if (b.x == -1 && b.y == -2) {
ret.x = 0, ret.y = -1;
} else if (b.x == -2 && b.y == -1) {
ret.x = -1, ret.y = 0;
}
y = av_clip(ret.ay + ret.y, 0, ret.h - 1);
x = av_clip(ret.ax + ret.x, 0, ret.w - 1);
return ret.block[y * ret.linesize + x];
}
static uint8_t half(int a, int b)
{
return ((a + b) + 1) / 2;
}
static uint8_t half3(int a, int b, int c)
{
return ((a + b + b + c) * 2 / 4 + 1) / 2;
}
static uint8_t pick_above(BlockXY bxy)
{
bxy.y = bxy.y - 1;
return pget(bxy);
}
static uint8_t pick_left(BlockXY bxy)
{
bxy.x = bxy.x - 1;
return pget(bxy);
}
static uint8_t half_horz(BlockXY bxy)
{
BlockXY a = bxy, b = bxy, c = bxy;
a.x -= 1;
c.x += 1;
return half3(pget(a), pget(b), pget(c));
}
static uint8_t half_vert(BlockXY bxy)
{
BlockXY a = bxy, b = bxy, c = bxy;
a.y -= 1;
c.y += 1;
return half3(pget(a), pget(b), pget(c));
}
static uint8_t pick_4(BlockXY bxy)
{
int val;
if ((bxy.x % 2) == 0) {
BlockXY ba, bb;
int a, b;
ba = bxy;
ba.x = -1;
ba.y = bxy.y + bxy.x / 2;
a = pget(ba);
bb = bxy;
bb.x = -1;
bb.y = bxy.y + bxy.x / 2 + 1;
b = pget(bb);
val = half(a, b);
} else {
BlockXY ba;
ba = bxy;
ba.x = -1;
ba.y = bxy.y + bxy.x / 2 + 1;
val = half_vert(ba);
}
return val;
}
static uint8_t pick_5(BlockXY bxy)
{
int val;
if (bxy.x == 0) {
BlockXY a = bxy;
BlockXY b = bxy;
a.x = -1;
a.y -= 1;
b.x = -1;
val = half(pget(a), pget(b));
} else if (bxy.y == 0) {
BlockXY a = bxy;
a.x -= 2;
a.y -= 1;
val = half_horz(a);
} else if (bxy.x == 1) {
BlockXY a = bxy;
a.x -= 2;
a.y -= 1;
val = half_vert(a);
} else {
BlockXY a = bxy;
a.x -= 2;
a.y -= 1;
val = pget(a);
}
return val;
}
static uint8_t pick_6(BlockXY bxy)
{
int val;
if (bxy.y == 0) {
BlockXY a = bxy;
BlockXY b = bxy;
a.x -= 1;
a.y = -1;
b.y = -1;
val = half(pget(a), pget(b));
} else if (bxy.x == 0) {
BlockXY a = bxy;
a.x -= 1;
a.y -= 2;
val = half_vert(a);
} else if (bxy.y == 1) {
BlockXY a = bxy;
a.x -= 1;
a.y -= 2;
val = half_horz(a);
} else {
BlockXY a = bxy;
a.x -= 1;
a.y -= 2;
val = pget(a);
}
return val;
}
static uint8_t pick_7(BlockXY bxy)
{
int clr, acc1, acc2;
BlockXY a = bxy;
a.x -= 1;
a.y -= 1;
clr = pget(a);
if (bxy.x && bxy.y)
return clr;
if (bxy.x == 0) {
a.x = -1;
a.y = bxy.y;
} else {
a.x = bxy.x - 2;
a.y = -1;
}
acc1 = pget(a);
if (bxy.y == 0) {
a.x = bxy.x;
a.y = -1;
} else {
a.x = -1;
a.y = bxy.y - 2;
}
acc2 = pget(a);
return half3(acc1, clr, acc2);
}
static uint8_t pick_8(BlockXY bxy)
{
BlockXY ba = bxy;
BlockXY bb = bxy;
int val;
if (bxy.y == 0) {
int a, b;
ba.y = -1;
a = pget(ba);
bb.x += 1;
bb.y = -1;
b = pget(bb);
val = half(a, b);
} else if (bxy.y == 1) {
ba.x += 1;
ba.y -= 2;
val = half_horz(ba);
} else if (bxy.x < bxy.size - 1) {
ba.x += 1;
ba.y -= 2;
val = pget(ba);
} else if (bxy.y % 2 == 0) {
int a, b;
ba.x = bxy.y / 2 + bxy.size - 1;
ba.y = -1;
a = pget(ba);
bb.x = bxy.y / 2 + bxy.size;
bb.y = -1;
b = pget(bb);
val = half(a, b);
} else {
ba.x = bxy.y / 2 + bxy.size;
ba.y = -1;
val = half_horz(ba);
}
return val;
}
static void block_fill_simple(uint8_t *block, int size, int linesize, int fill)
{
for (int y = 0; y < size; y++) {
memset(block, fill, size);
block += linesize;
}
}
static void block_fill(uint8_t *block, int size, int linesize,
int w, int h, int ax, int ay,
uint8_t (*pick)(BlockXY bxy))
{
BlockXY bxy;
bxy.size = size;
bxy.block = block;
bxy.linesize = linesize;
bxy.w = w;
bxy.h = h;
bxy.ay = ay;
bxy.ax = ax;
for (int y = 0; y < size; y++) {
bxy.y = y;
for (int x = 0; x < size; x++) {
uint8_t val;
bxy.x = x;
val = pick(bxy);
block[ax + x + (ay + y) * linesize] = val;
}
}
}
static int block_sum(const uint8_t *block, int w, int h, int linesize)
{
int sum = 0;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
sum += block[x];
}
block += linesize;
}
return sum;
}
static int predict_intra(AVCodecContext *avctx, AVFrame *frame, int ax, int ay,
int pmode, int add_coeffs, int size, int plane)
{
MobiClipContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
int w = avctx->width >> !!plane, h = avctx->height >> !!plane;
int ret = 0;
switch (pmode) {
case 0:
block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_above);
break;
case 1:
block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_left);
break;
case 2:
{
int arr1[16];
int arr2[16];
uint8_t *top = frame->data[plane] + FFMAX(ay - 1, 0) * frame->linesize[plane] + ax;
uint8_t *left = frame->data[plane] + ay * frame->linesize[plane] + FFMAX(ax - 1, 0);
int bottommost = frame->data[plane][(ay + size - 1) * frame->linesize[plane] + FFMAX(ax - 1, 0)];
int rightmost = frame->data[plane][FFMAX(ay - 1, 0) * frame->linesize[plane] + ax + size - 1];
int avg = (bottommost + rightmost + 1) / 2 + 2 * av_clip(get_se_golomb(gb), -(1<<16), 1<<16);
int r6 = adjust(avg - bottommost, size);
int r9 = adjust(avg - rightmost, size);
int shift = adjust(size, size) == 8 ? 3 : 2;
uint8_t *block;
for (int x = 0; x < size; x++) {
int val = top[x];
arr1[x] = adjust(((bottommost - val) * (1 << shift)) + r6 * (x + 1), size);
}
for (int y = 0; y < size; y++) {
int val = left[y * frame->linesize[plane]];
arr2[y] = adjust(((rightmost - val) * (1 << shift)) + r9 * (y + 1), size);
}
block = frame->data[plane] + ay * frame->linesize[plane] + ax;
for (int y = 0; y < size; y++) {
for (int x = 0; x < size; x++) {
block[x] = (((top[x] + left[0] + ((arr1[x] * (y + 1) +
arr2[y] * (x + 1)) >> 2 * shift)) + 1) / 2) & 0xFF;
}
block += frame->linesize[plane];
left += frame->linesize[plane];
}
}
break;
case 3:
{
uint8_t fill;
if (ax == 0 && ay == 0) {
fill = 0x80;
} else if (ax >= 1 && ay >= 1) {
int left = block_sum(frame->data[plane] + ay * frame->linesize[plane] + ax - 1,
1, size, frame->linesize[plane]);
int top = block_sum(frame->data[plane] + (ay - 1) * frame->linesize[plane] + ax,
size, 1, frame->linesize[plane]);
fill = ((left + top) * 2 / (2 * size) + 1) / 2;
} else if (ax >= 1) {
fill = (block_sum(frame->data[plane] + ay * frame->linesize[plane] + ax - 1,
1, size, frame->linesize[plane]) * 2 / size + 1) / 2;
} else if (ay >= 1) {
fill = (block_sum(frame->data[plane] + (ay - 1) * frame->linesize[plane] + ax,
size, 1, frame->linesize[plane]) * 2 / size + 1) / 2;
} else {
return -1;
}
block_fill_simple(frame->data[plane] + ay * frame->linesize[plane] + ax,
size, frame->linesize[plane], fill);
}
break;
case 4:
block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_4);
break;
case 5:
block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_5);
break;
case 6:
block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_6);
break;
case 7:
block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_7);
break;
case 8:
block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_8);
break;
}
if (add_coeffs)
ret = add_coefficients(avctx, frame, ax, ay, size, plane);
return ret;
}
static int get_prediction(AVCodecContext *avctx, int x, int y, int size)
{
MobiClipContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
int index = (y & 0xC) | (x / 4 % 4);
uint8_t val = FFMIN(s->pre[index], index % 4 == 0 ? 9 : s->pre[index + 3]);
if (val == 9)
val = 3;
if (!get_bits1(gb)) {
int x = get_bits(gb, 3);
val = x + (x >= val ? 1 : 0);
}
s->pre[index + 4] = val;
if (size == 8)
s->pre[index + 5] = s->pre[index + 8] = s->pre[index + 9] = val;
return val;
}
static int process_block(AVCodecContext *avctx, AVFrame *frame,
int x, int y, int pmode, int has_coeffs, int plane)
{
MobiClipContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
int tmp, ret;
if (!has_coeffs) {
if (pmode < 0)
pmode = get_prediction(avctx, x, y, 8);
return predict_intra(avctx, frame, x, y, pmode, 0, 8, plane);
}
tmp = get_ue_golomb_31(gb);
if ((unsigned)tmp > FF_ARRAY_ELEMS(block4x4_coefficients_tab))
return AVERROR_INVALIDDATA;
if (tmp == 0) {
if (pmode < 0)
pmode = get_prediction(avctx, x, y, 8);
ret = predict_intra(avctx, frame, x, y, pmode, 1, 8, plane);
} else {
int flags = block4x4_coefficients_tab[tmp - 1];
for (int by = y; by < y + 8; by += 4) {
for (int bx = x; bx < x + 8; bx += 4) {
int new_pmode = pmode;
if (new_pmode < 0)
new_pmode = get_prediction(avctx, bx, by, 4);
ret = predict_intra(avctx, frame, bx, by, new_pmode, flags & 1, 4, plane);
if (ret < 0)
return ret;
flags >>= 1;
}
}
}
return ret;
}
static int decode_macroblock(AVCodecContext *avctx, AVFrame *frame,
int x, int y, int predict)
{
MobiClipContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
int flags, pmode_uv, idx = get_ue_golomb(gb);
int ret = 0;
if (idx < 0 || idx >= FF_ARRAY_ELEMS(block8x8_coefficients_tab))
return AVERROR_INVALIDDATA;
flags = block8x8_coefficients_tab[idx];
if (predict) {
ret = process_block(avctx, frame, x, y, -1, flags & 1, 0);
if (ret < 0)
return ret;
flags >>= 1;
ret = process_block(avctx, frame, x + 8, y, -1, flags & 1, 0);
if (ret < 0)
return ret;
flags >>= 1;
ret = process_block(avctx, frame, x, y + 8, -1, flags & 1, 0);
if (ret < 0)
return ret;
flags >>= 1;
ret = process_block(avctx, frame, x + 8, y + 8, -1, flags & 1, 0);
if (ret < 0)
return ret;
flags >>= 1;
} else {
int pmode = get_bits(gb, 3);
if (pmode == 2) {
ret = predict_intra(avctx, frame, x, y, pmode, 0, 16, 0);
if (ret < 0)
return ret;
pmode = 9;
}
ret = process_block(avctx, frame, x, y, pmode, flags & 1, 0);
if (ret < 0)
return ret;
flags >>= 1;
ret = process_block(avctx, frame, x + 8, y, pmode, flags & 1, 0);
if (ret < 0)
return ret;
flags >>= 1;
ret = process_block(avctx, frame, x, y + 8, pmode, flags & 1, 0);
if (ret < 0)
return ret;
flags >>= 1;
ret = process_block(avctx, frame, x + 8, y + 8, pmode, flags & 1, 0);
if (ret < 0)
return ret;
flags >>= 1;
}
pmode_uv = get_bits(gb, 3);
if (pmode_uv == 2) {
ret = predict_intra(avctx, frame, x >> 1, y >> 1, pmode_uv, 0, 8, 1 + !s->moflex);
if (ret < 0)
return ret;
ret = predict_intra(avctx, frame, x >> 1, y >> 1, pmode_uv, 0, 8, 2 - !s->moflex);
if (ret < 0)
return ret;
pmode_uv = 9;
}
ret = process_block(avctx, frame, x >> 1, y >> 1, pmode_uv, flags & 1, 1 + !s->moflex);
if (ret < 0)
return ret;
flags >>= 1;
ret = process_block(avctx, frame, x >> 1, y >> 1, pmode_uv, flags & 1, 2 - !s->moflex);
if (ret < 0)
return ret;
return 0;
}
static int get_index(int x)
{
return x == 16 ? 0 : x == 8 ? 1 : x == 4 ? 2 : x == 2 ? 3 : 0;
}
static int predict_motion(AVCodecContext *avctx,
int width, int height, int index,
int offsetm, int offsetx, int offsety)
{
MobiClipContext *s = avctx->priv_data;
MotionXY *motion = s->motion;
GetBitContext *gb = &s->gb;
int fheight = avctx->height;
int fwidth = avctx->width;
if (index <= 5) {
int sidx = -FFMAX(1, index) + s->current_pic;
MotionXY mv = s->motion[0];
if (sidx < 0)
sidx += 6;
if (index > 0) {
mv.x = mv.x + (unsigned)get_se_golomb(gb);
mv.y = mv.y + (unsigned)get_se_golomb(gb);
}
if (mv.x >= INT_MAX || mv.y >= INT_MAX)
return AVERROR_INVALIDDATA;
motion[offsetm].x = mv.x;
motion[offsetm].y = mv.y;
for (int i = 0; i < 3; i++) {
int method, src_linesize, dst_linesize;
uint8_t *src, *dst;
if (i == 1) {
offsetx = offsetx >> 1;
offsety = offsety >> 1;
mv.x = mv.x >> 1;
mv.y = mv.y >> 1;
width = width >> 1;
height = height >> 1;
fwidth = fwidth >> 1;
fheight = fheight >> 1;
}
av_assert0(s->pic[sidx]);
av_assert0(s->pic[s->current_pic]);
av_assert0(s->pic[s->current_pic]->data[i]);
if (!s->pic[sidx]->data[i])
return AVERROR_INVALIDDATA;
method = (mv.x & 1) | ((mv.y & 1) << 1);
src_linesize = s->pic[sidx]->linesize[i];
dst_linesize = s->pic[s->current_pic]->linesize[i];
dst = s->pic[s->current_pic]->data[i] + offsetx + offsety * dst_linesize;
if (offsetx + (mv.x >> 1) < 0 ||
offsety + (mv.y >> 1) < 0 ||
offsetx + width + (mv.x + 1 >> 1) > fwidth ||
offsety + height + (mv.y + 1 >> 1) > fheight)
return AVERROR_INVALIDDATA;
switch (method) {
case 0:
src = s->pic[sidx]->data[i] + offsetx + (mv.x >> 1) +
(offsety + (mv.y >> 1)) * src_linesize;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++)
dst[x] = src[x];
dst += dst_linesize;
src += src_linesize;
}
break;
case 1:
src = s->pic[sidx]->data[i] + offsetx + (mv.x >> 1) +
(offsety + (mv.y >> 1)) * src_linesize;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
dst[x] = (uint8_t)((src[x] >> 1) + (src[x + 1] >> 1));
}
dst += dst_linesize;
src += src_linesize;
}
break;
case 2:
src = s->pic[sidx]->data[i] + offsetx + (mv.x >> 1) +
(offsety + (mv.y >> 1)) * src_linesize;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
dst[x] = (uint8_t)((src[x] >> 1) + (src[x + src_linesize] >> 1));
}
dst += dst_linesize;
src += src_linesize;
}
break;
case 3:
src = s->pic[sidx]->data[i] + offsetx + (mv.x >> 1) +
(offsety + (mv.y >> 1)) * src_linesize;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
dst[x] = (uint8_t)((((src[x] >> 1) + (src[x + 1] >> 1)) >> 1) +
(((src[x + src_linesize] >> 1) + (src[x + 1 + src_linesize] >> 1)) >> 1));
}
dst += dst_linesize;
src += src_linesize;
}
break;
}
}
} else {
int tidx;
int adjx = index == 8 ? 0 : width / 2;
int adjy = index == 8 ? height / 2 : 0;
width = width - adjx;
height = height - adjy;
tidx = get_index(height) * 4 + get_index(width);
for (int i = 0; i < 2; i++) {
int ret, idx2;
idx2 = get_vlc2(gb, mv_vlc[s->moflex][tidx].table,
MOBI_MV_VLC_BITS, 1);
ret = predict_motion(avctx, width, height, idx2,
offsetm, offsetx + i * adjx, offsety + i * adjy);
if (ret < 0)
return ret;
}
}
return 0;
}
static int mobiclip_decode(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *pkt)
{
MobiClipContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
AVFrame *frame = s->pic[s->current_pic];
int ret;
av_fast_padded_malloc(&s->bitstream, &s->bitstream_size,
pkt->size);
if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
return ret;
s->bdsp.bswap16_buf((uint16_t *)s->bitstream,
(uint16_t *)pkt->data,
(pkt->size + 1) >> 1);
ret = init_get_bits8(gb, s->bitstream, FFALIGN(pkt->size, 2));
if (ret < 0)
return ret;
if (get_bits1(gb)) {
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
s->moflex = get_bits1(gb);
s->dct_tab_idx = get_bits1(gb);
ret = setup_qtables(avctx, get_bits(gb, 6));
if (ret < 0)
return ret;
for (int y = 0; y < avctx->height; y += 16) {
for (int x = 0; x < avctx->width; x += 16) {
ret = decode_macroblock(avctx, frame, x, y, get_bits1(gb));
if (ret < 0)
return ret;
}
}
} else {
MotionXY *motion = s->motion;
memset(motion, 0, s->motion_size);
frame->pict_type = AV_PICTURE_TYPE_P;
frame->key_frame = 0;
s->dct_tab_idx = 0;
ret = setup_qtables(avctx, s->quantizer + get_se_golomb(gb));
if (ret < 0)
return ret;
for (int y = 0; y < avctx->height; y += 16) {
for (int x = 0; x < avctx->width; x += 16) {
int idx;
motion[0].x = mid_pred(motion[x / 16 + 1].x, motion[x / 16 + 2].x, motion[x / 16 + 3].x);
motion[0].y = mid_pred(motion[x / 16 + 1].y, motion[x / 16 + 2].y, motion[x / 16 + 3].y);
motion[x / 16 + 2].x = 0;
motion[x / 16 + 2].y = 0;
idx = get_vlc2(gb, mv_vlc[s->moflex][0].table,
MOBI_MV_VLC_BITS, 1);
if (idx == 6 || idx == 7) {
ret = decode_macroblock(avctx, frame, x, y, idx == 7);
if (ret < 0)
return ret;
} else {
int flags, idx2;
ret = predict_motion(avctx, 16, 16, idx, x / 16 + 2, x, y);
if (ret < 0)
return ret;
idx2 = get_ue_golomb(gb);
if (idx2 >= FF_ARRAY_ELEMS(pframe_block8x8_coefficients_tab))
return AVERROR_INVALIDDATA;
flags = pframe_block8x8_coefficients_tab[idx2];
for (int sy = y; sy < y + 16; sy += 8) {
for (int sx = x; sx < x + 16; sx += 8) {
if (flags & 1)
add_pframe_coefficients(avctx, frame, sx, sy, 8, 0);
flags >>= 1;
}
}
if (flags & 1)
add_pframe_coefficients(avctx, frame, x >> 1, y >> 1, 8, 1 + !s->moflex);
flags >>= 1;
if (flags & 1)
add_pframe_coefficients(avctx, frame, x >> 1, y >> 1, 8, 2 - !s->moflex);
}
}
}
}
if (!s->moflex)
avctx->colorspace = AVCOL_SPC_YCGCO;
s->current_pic = (s->current_pic + 1) % 6;
ret = av_frame_ref(data, frame);
if (ret < 0)
return ret;
*got_frame = 1;
return 0;
}
static void mobiclip_flush(AVCodecContext *avctx)
{
MobiClipContext *s = avctx->priv_data;
for (int i = 0; i < 6; i++)
av_frame_unref(s->pic[i]);
}
static av_cold int mobiclip_close(AVCodecContext *avctx)
{
MobiClipContext *s = avctx->priv_data;
av_freep(&s->bitstream);
s->bitstream_size = 0;
av_freep(&s->motion);
s->motion_size = 0;
for (int i = 0; i < 6; i++) {
av_frame_free(&s->pic[i]);
}
return 0;
}
const AVCodec ff_mobiclip_decoder = {
.name = "mobiclip",
.long_name = NULL_IF_CONFIG_SMALL("MobiClip Video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MOBICLIP,
.priv_data_size = sizeof(MobiClipContext),
.init = mobiclip_init,
.decode = mobiclip_decode,
.flush = mobiclip_flush,
.close = mobiclip_close,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
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