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FFmpeg/libavcodec/mobiclip.c
Andreas Rheinhardt e42fc62633 avcodec/mobiclip: Fix heap-buffer-overflow 
The MobiClip decoder uses adjacent pixels for prediction; yet when
accessing the left pixel, it was forgotten to clip the x coordinate.
This results in an heap-buffer-overflow. It can e.g. be reproduced with
the sample from https://samples.ffmpeg.org/V-codecs/MOHD/crap.avi when
forcing the video decoder to mobiclip.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-09-15 19:25:26 +02:00

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/*
* MobiClip Video decoder
* 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 "avcodec.h"
#include "bytestream.h"
#include "bswapdsp.h"
#include "get_bits.h"
#include "golomb.h"
#include "internal.h"
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 codes0[] = {
0x0, 0x4, 0x5, 0x6, 0x7, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA,
0xB, 0xC, 0xD, 0xE, 0xF, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
0x26, 0x27, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x3, 0x20,
0x21, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23,
0x24, 0x25, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A,
0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x10, 0x11, 0x12, 0x13, 0x14,
0x15, 0x16, 0x17, 0xC, 0xD, 0xE, 0xF, 0x10, 0x11, 0x12,
0x13, 0x14, 0x15, 0xB, 0xC, 0xD, 0x7, 0x2, 0x6, 0xE, 0xF,
};
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[16][10] =
{
{ 1, 3, 3, 4, 4, 5, 5, 5, 6, 6 },
{ 2, 2, 3, 3, 3, 4, 5, 5 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 1, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 3, 4, 5, 5 },
{ 2, 3, 3, 3, 3, 3, 4, 4 },
{ 1, 3, 3, 4, 4, 4, 5, 5 },
{ 1, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 1, 3, 3, 4, 4, 4, 5, 5 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 3, 4, 4 },
{ 1, 3, 3, 4, 4, 4, 4 },
{ 1, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 3, 4, 4 },
{ 2, 2, 3, 3, 3, 3 },
};
static const uint8_t mv_codes[16][10] =
{
{ 1, 0, 2, 2, 7, 6, 7, 12, 26, 27 },
{ 0, 2, 2, 6, 7, 6, 14, 15 },
{ 0, 3, 3, 4, 4, 5, 10, 11 },
{ 0, 5, 7, 8, 9, 12, 13 },
{ 1, 3, 0, 1, 5, 8, 18, 19 },
{ 3, 0, 2, 3, 4, 5, 2, 3 },
{ 0, 4, 5, 12, 13, 14, 30, 31 },
{ 0, 5, 6, 8, 9, 14, 15 },
{ 0, 3, 3, 4, 4, 5, 10, 11 },
{ 0, 4, 5, 12, 13, 14, 30, 31 },
{ 0, 3, 2, 5, 6, 7, 8, 9 },
{ 0, 3, 2, 3, 5, 8, 9 },
{ 0, 5, 6, 8, 9, 14, 15 },
{ 0, 5, 6, 8, 9, 14, 15 },
{ 0, 3, 2, 3, 5, 8, 9 },
{ 0, 3, 2, 3, 4, 5 },
};
static const uint8_t mv_syms[16][10] =
{
{ 0, 8, 1, 2, 9, 3, 6, 7, 5, 4 },
{ 9, 1, 2, 8, 0, 3, 5, 4 },
{ 0, 1, 2, 9, 5, 4, 3, 8 },
{ 1, 2, 0, 5, 4, 8, 3 },
{ 8, 1, 2, 9, 0, 3, 5, 4 },
{ 1, 3, 2, 9, 8, 0, 5, 4 },
{ 1, 2, 0, 9, 8, 3, 5, 4 },
{ 1, 2, 0, 8, 5, 4, 3 },
{ 0, 1, 2, 8, 5, 4, 3, 9 },
{ 1, 2, 0, 9, 8, 3, 5, 4 },
{ 0, 1, 3, 2, 9, 8, 5, 4 },
{ 0, 1, 4, 3, 2, 8, 5 },
{ 1, 2, 0, 5, 4, 9, 3 },
{ 1, 2, 0, 9, 5, 4, 3 },
{ 0, 1, 5, 3, 2, 9, 4 },
{ 0, 1, 4, 5, 3, 2 },
};
static const uint8_t mv_bits_mods[16][10] =
{
{ 2, 2, 3, 3, 4, 4, 5, 5, 5, 5 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 1, 3, 3, 3, 4, 5, 5 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 2, 3, 4, 5, 5 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 3, 4, 5, 5 },
{ 2, 2, 3, 3, 3, 4, 4 },
{ 1, 3, 3, 4, 4, 4, 4 },
{ 2, 2, 3, 3, 3, 4, 4 },
{ 2, 2, 3, 3, 3, 4, 4 },
{ 2, 2, 3, 3, 3, 3 },
};
static const uint8_t mv_codes_mods[16][10] =
{
{ 0, 3, 2, 3, 9, 10, 16, 17, 22, 23 },
{ 0, 3, 2, 4, 6, 7, 10, 11 },
{ 1, 3, 0, 5, 2, 3, 8, 9 },
{ 0, 4, 6, 7, 10, 22, 23 },
{ 0, 3, 3, 4, 4, 5, 10, 11 },
{ 0, 3, 2, 5, 6, 7, 8, 9 },
{ 0, 3, 2, 5, 6, 7, 8, 9 },
{ 0, 1, 3, 4, 10, 22, 23 },
{ 0, 3, 2, 4, 6, 7, 10, 11 },
{ 0, 3, 3, 5, 4, 5, 8, 9 },
{ 0, 3, 2, 3, 5, 9, 16, 17 },
{ 0, 3, 2, 4, 5, 6, 7 },
{ 0, 5, 6, 8, 9, 14, 15 },
{ 0, 3, 2, 4, 5, 6, 7 },
{ 0, 3, 2, 4, 5, 6, 7 },
{ 1, 2, 0, 1, 6, 7 },
};
static const uint8_t mv_syms_mods[16][10] =
{
{ 1, 0, 8, 9, 2, 7, 4, 3, 5, 6 },
{ 0, 1, 9, 2, 5, 4, 3, 8 },
{ 0, 1, 3, 2, 9, 5, 4, 8 },
{ 1, 3, 2, 0, 4, 8, 5 },
{ 0, 1, 8, 2, 5, 4, 3, 9 },
{ 0, 1, 3, 2, 5, 9, 4, 8 },
{ 0, 1, 3, 2, 9, 5, 8, 4 },
{ 0, 2, 1, 3, 4, 8, 5 },
{ 0, 1, 3, 2, 8, 4, 5, 9 },
{ 2, 1, 3, 0, 8, 9, 5, 4 },
{ 0, 1, 4, 3, 2, 5, 8, 9 },
{ 0, 1, 4, 3, 2, 8, 5 },
{ 1, 2, 0, 9, 4, 5, 3 },
{ 2, 1, 4, 3, 0, 9, 5 },
{ 0, 1, 4, 3, 2, 9, 5 },
{ 1, 0, 5, 4, 3, 2 },
};
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;
VLC vlc[2];
VLC mv_vlc[2][16];
int qtab[2][64];
uint8_t pre[32];
MotionXY *motion;
int motion_size;
BswapDSPContext bdsp;
} MobiClipContext;
static av_cold int mobiclip_init(AVCodecContext *avctx)
{
MobiClipContext *s = avctx->priv_data;
int ret;
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;
ret = ff_init_vlc_sparse(&s->vlc[0], 12, 104,
bits0, sizeof(*bits0), sizeof(*bits0),
codes0, sizeof(*codes0), sizeof(*codes0),
syms0, sizeof(*syms0), sizeof(*syms0), 0);
if (ret < 0)
return ret;
ret = ff_init_vlc_sparse(&s->vlc[1], 12, 104,
bits0, sizeof(*bits0), sizeof(*bits0),
codes0, sizeof(*codes0), sizeof(*codes0),
syms1, sizeof(*syms1), sizeof(*syms1), 0);
if (ret < 0)
return ret;
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);
}
for (int j = 0; j < 16; j++) {
ret = ff_init_vlc_sparse(&s->mv_vlc[0][j], 8, mv_len[j],
mv_bits_mods[j], sizeof(*mv_bits_mods[j]), sizeof(*mv_bits_mods[j]),
mv_codes_mods[j], sizeof(*mv_codes_mods[j]), sizeof(*mv_codes_mods[j]),
mv_syms_mods[j], sizeof(*mv_syms_mods[j]), sizeof(*mv_syms_mods[j]), 0);
if (ret < 0)
return ret;
ret = ff_init_vlc_sparse(&s->mv_vlc[1][j], 8, mv_len[j],
mv_bits[j], sizeof(*mv_bits[j]), sizeof(*mv_bits[j]),
mv_codes[j], sizeof(*mv_codes[j]), sizeof(*mv_codes[j]),
mv_syms[j], sizeof(*mv_syms[j]), sizeof(*mv_syms[j]), 0);
if (ret < 0)
return ret;
}
return 0;
}
static void setup_qtables(AVCodecContext *avctx, int quantizer)
{
MobiClipContext *s = avctx->priv_data;
int qx, qy;
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;
}
static void inverse4(int *rs)
{
int a = rs[0] + rs[2];
int b = rs[0] - rs[2];
int c = rs[1] + (rs[3] >> 1);
int d = (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, 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 = arr[7] + arr[1] - arr[3] - (arr[3] >> 1);
f = arr[7] - arr[1] + arr[5] + (arr[5] >> 1);
g = arr[5] - arr[3] - arr[7] - (arr[7] >> 1);
h = arr[5] + arr[3] + arr[1] + (arr[1] >> 1);
x3 = g + (h >> 2);
x2 = e + (f >> 2);
x1 = (e >> 2) - f;
x0 = 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 int 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, s->vlc[s->dct_tab_idx].table,
s->vlc[s->dct_tab_idx].bits, 2);
if (n < 0)
return AVERROR_INVALIDDATA;
*last = (n >> 11) == 1;
*run = (n >> 5) & 0x3F;
*level = n & 0x1F;
return 0;
}
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;
int ret = 0;
for (int pos = 0; get_bits_left(gb) > 0; pos++) {
int qval, last, run, level;
ret = read_run_encoding(avctx, &last, &run, &level);
if (ret < 0)
return ret;
if (level) {
if (get_bits1(gb))
level = -level;
} else if (!get_bits1(gb)) {
ret = read_run_encoding(avctx, &last, &run, &level);
if (ret < 0)
return ret;
level += run_residue[s->dct_tab_idx][(last ? 64 : 0) + run];
if (get_bits1(gb))
level = -level;
} else if (!get_bits1(gb)) {
ret = read_run_encoding(avctx, &last, &run, &level);
if (ret < 0)
return ret;
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 * 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 ret;
}
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(gb);
if (idx == 0) {
ret = add_coefficients(avctx, frame, bx, by, size, plane);
} else if (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;
}
}
} else {
ret = AVERROR_INVALIDDATA;
}
return ret;
}
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 * get_se_golomb(gb);
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(gb);
if (tmp < 0 || 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 + get_se_golomb(gb);
mv.y = mv.y + get_se_golomb(gb);
}
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;
switch (method) {
case 0:
if (offsety + (mv.y >> 1) < 0 ||
offsety + (mv.y >> 1) >= fheight ||
offsetx + (mv.x >> 1) < 0 ||
offsetx + (mv.x >> 1) >= fwidth)
return AVERROR_INVALIDDATA;
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:
if (offsety + (mv.y >> 1) < 0 ||
offsety + (mv.y >> 1) >= fheight ||
offsetx + (mv.x >> 1) < 0 ||
offsetx + (mv.x >> 1) >= fwidth)
return AVERROR_INVALIDDATA;
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:
if (offsety + (mv.y >> 1) < 0 ||
offsety + (mv.y >> 1) >= fheight - 1 ||
offsetx + (mv.x >> 1) < 0 ||
offsetx + (mv.x >> 1) >= fwidth)
return AVERROR_INVALIDDATA;
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:
if (offsety + (mv.y >> 1) < 0 ||
offsety + (mv.y >> 1) >= fheight - 1 ||
offsetx + (mv.x >> 1) < 0 ||
offsetx + (mv.x >> 1) >= fwidth)
return AVERROR_INVALIDDATA;
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, s->mv_vlc[s->moflex][tidx].table,
s->mv_vlc[s->moflex][tidx].bits, 1);
if (idx2 < 0)
return AVERROR_INVALIDDATA;
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, s->bitstream_size);
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);
setup_qtables(avctx, get_bits(gb, 6));
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;
int quantizer = s->quantizer + get_se_golomb(gb);
if (quantizer < 12 || quantizer > 161)
return AVERROR_INVALIDDATA;
memset(motion, 0, s->motion_size);
frame->pict_type = AV_PICTURE_TYPE_P;
frame->key_frame = 0;
s->dct_tab_idx = 0;
setup_qtables(avctx, quantizer);
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, s->mv_vlc[s->moflex][0].table,
s->mv_vlc[s->moflex][0].bits, 1);
if (idx < 0)
return AVERROR_INVALIDDATA;
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;
ff_free_vlc(&s->vlc[0]);
ff_free_vlc(&s->vlc[1]);
for (int i = 0; i < 16; i++) {
ff_free_vlc(&s->mv_vlc[0][i]);
ff_free_vlc(&s->mv_vlc[1][i]);
}
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;
}
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_CLEANUP,
};
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