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FFmpeg/libavcodec/sanm.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* LucasArts Smush video decoder
* Copyright (c) 2006 Cyril Zorin
* Copyright (c) 2011 Konstantin Shishkov
*
* 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 "libavutil/avassert.h"
#include "libavutil/bswap.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "copy_block.h"
#include "codec_internal.h"
#include "internal.h"
#define NGLYPHS 256
#define GLYPH_COORD_VECT_SIZE 16
#define PALETTE_SIZE 256
#define PALETTE_DELTA 768
static const int8_t glyph4_x[GLYPH_COORD_VECT_SIZE] = {
0, 1, 2, 3, 3, 3, 3, 2, 1, 0, 0, 0, 1, 2, 2, 1
};
static const int8_t glyph4_y[GLYPH_COORD_VECT_SIZE] = {
0, 0, 0, 0, 1, 2, 3, 3, 3, 3, 2, 1, 1, 1, 2, 2
};
static const int8_t glyph8_x[GLYPH_COORD_VECT_SIZE] = {
0, 2, 5, 7, 7, 7, 7, 7, 7, 5, 2, 0, 0, 0, 0, 0
};
static const int8_t glyph8_y[GLYPH_COORD_VECT_SIZE] = {
0, 0, 0, 0, 1, 3, 4, 6, 7, 7, 7, 7, 6, 4, 3, 1
};
static const int8_t motion_vectors[256][2] = {
{ 0, 0 }, { -1, -43 }, { 6, -43 }, { -9, -42 }, { 13, -41 },
{ -16, -40 }, { 19, -39 }, { -23, -36 }, { 26, -34 }, { -2, -33 },
{ 4, -33 }, { -29, -32 }, { -9, -32 }, { 11, -31 }, { -16, -29 },
{ 32, -29 }, { 18, -28 }, { -34, -26 }, { -22, -25 }, { -1, -25 },
{ 3, -25 }, { -7, -24 }, { 8, -24 }, { 24, -23 }, { 36, -23 },
{ -12, -22 }, { 13, -21 }, { -38, -20 }, { 0, -20 }, { -27, -19 },
{ -4, -19 }, { 4, -19 }, { -17, -18 }, { -8, -17 }, { 8, -17 },
{ 18, -17 }, { 28, -17 }, { 39, -17 }, { -12, -15 }, { 12, -15 },
{ -21, -14 }, { -1, -14 }, { 1, -14 }, { -41, -13 }, { -5, -13 },
{ 5, -13 }, { 21, -13 }, { -31, -12 }, { -15, -11 }, { -8, -11 },
{ 8, -11 }, { 15, -11 }, { -2, -10 }, { 1, -10 }, { 31, -10 },
{ -23, -9 }, { -11, -9 }, { -5, -9 }, { 4, -9 }, { 11, -9 },
{ 42, -9 }, { 6, -8 }, { 24, -8 }, { -18, -7 }, { -7, -7 },
{ -3, -7 }, { -1, -7 }, { 2, -7 }, { 18, -7 }, { -43, -6 },
{ -13, -6 }, { -4, -6 }, { 4, -6 }, { 8, -6 }, { -33, -5 },
{ -9, -5 }, { -2, -5 }, { 0, -5 }, { 2, -5 }, { 5, -5 },
{ 13, -5 }, { -25, -4 }, { -6, -4 }, { -3, -4 }, { 3, -4 },
{ 9, -4 }, { -19, -3 }, { -7, -3 }, { -4, -3 }, { -2, -3 },
{ -1, -3 }, { 0, -3 }, { 1, -3 }, { 2, -3 }, { 4, -3 },
{ 6, -3 }, { 33, -3 }, { -14, -2 }, { -10, -2 }, { -5, -2 },
{ -3, -2 }, { -2, -2 }, { -1, -2 }, { 0, -2 }, { 1, -2 },
{ 2, -2 }, { 3, -2 }, { 5, -2 }, { 7, -2 }, { 14, -2 },
{ 19, -2 }, { 25, -2 }, { 43, -2 }, { -7, -1 }, { -3, -1 },
{ -2, -1 }, { -1, -1 }, { 0, -1 }, { 1, -1 }, { 2, -1 },
{ 3, -1 }, { 10, -1 }, { -5, 0 }, { -3, 0 }, { -2, 0 },
{ -1, 0 }, { 1, 0 }, { 2, 0 }, { 3, 0 }, { 5, 0 },
{ 7, 0 }, { -10, 1 }, { -7, 1 }, { -3, 1 }, { -2, 1 },
{ -1, 1 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 3, 1 },
{ -43, 2 }, { -25, 2 }, { -19, 2 }, { -14, 2 }, { -5, 2 },
{ -3, 2 }, { -2, 2 }, { -1, 2 }, { 0, 2 }, { 1, 2 },
{ 2, 2 }, { 3, 2 }, { 5, 2 }, { 7, 2 }, { 10, 2 },
{ 14, 2 }, { -33, 3 }, { -6, 3 }, { -4, 3 }, { -2, 3 },
{ -1, 3 }, { 0, 3 }, { 1, 3 }, { 2, 3 }, { 4, 3 },
{ 19, 3 }, { -9, 4 }, { -3, 4 }, { 3, 4 }, { 7, 4 },
{ 25, 4 }, { -13, 5 }, { -5, 5 }, { -2, 5 }, { 0, 5 },
{ 2, 5 }, { 5, 5 }, { 9, 5 }, { 33, 5 }, { -8, 6 },
{ -4, 6 }, { 4, 6 }, { 13, 6 }, { 43, 6 }, { -18, 7 },
{ -2, 7 }, { 0, 7 }, { 2, 7 }, { 7, 7 }, { 18, 7 },
{ -24, 8 }, { -6, 8 }, { -42, 9 }, { -11, 9 }, { -4, 9 },
{ 5, 9 }, { 11, 9 }, { 23, 9 }, { -31, 10 }, { -1, 10 },
{ 2, 10 }, { -15, 11 }, { -8, 11 }, { 8, 11 }, { 15, 11 },
{ 31, 12 }, { -21, 13 }, { -5, 13 }, { 5, 13 }, { 41, 13 },
{ -1, 14 }, { 1, 14 }, { 21, 14 }, { -12, 15 }, { 12, 15 },
{ -39, 17 }, { -28, 17 }, { -18, 17 }, { -8, 17 }, { 8, 17 },
{ 17, 18 }, { -4, 19 }, { 0, 19 }, { 4, 19 }, { 27, 19 },
{ 38, 20 }, { -13, 21 }, { 12, 22 }, { -36, 23 }, { -24, 23 },
{ -8, 24 }, { 7, 24 }, { -3, 25 }, { 1, 25 }, { 22, 25 },
{ 34, 26 }, { -18, 28 }, { -32, 29 }, { 16, 29 }, { -11, 31 },
{ 9, 32 }, { 29, 32 }, { -4, 33 }, { 2, 33 }, { -26, 34 },
{ 23, 36 }, { -19, 39 }, { 16, 40 }, { -13, 41 }, { 9, 42 },
{ -6, 43 }, { 1, 43 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
};
static const int8_t c37_mv[] = {
0, 0, 1, 0, 2, 0, 3, 0, 5, 0,
8, 0, 13, 0, 21, 0, -1, 0, -2, 0,
-3, 0, -5, 0, -8, 0, -13, 0, -17, 0,
-21, 0, 0, 1, 1, 1, 2, 1, 3, 1,
5, 1, 8, 1, 13, 1, 21, 1, -1, 1,
-2, 1, -3, 1, -5, 1, -8, 1, -13, 1,
-17, 1, -21, 1, 0, 2, 1, 2, 2, 2,
3, 2, 5, 2, 8, 2, 13, 2, 21, 2,
-1, 2, -2, 2, -3, 2, -5, 2, -8, 2,
-13, 2, -17, 2, -21, 2, 0, 3, 1, 3,
2, 3, 3, 3, 5, 3, 8, 3, 13, 3,
21, 3, -1, 3, -2, 3, -3, 3, -5, 3,
-8, 3, -13, 3, -17, 3, -21, 3, 0, 5,
1, 5, 2, 5, 3, 5, 5, 5, 8, 5,
13, 5, 21, 5, -1, 5, -2, 5, -3, 5,
-5, 5, -8, 5, -13, 5, -17, 5, -21, 5,
0, 8, 1, 8, 2, 8, 3, 8, 5, 8,
8, 8, 13, 8, 21, 8, -1, 8, -2, 8,
-3, 8, -5, 8, -8, 8, -13, 8, -17, 8,
-21, 8, 0, 13, 1, 13, 2, 13, 3, 13,
5, 13, 8, 13, 13, 13, 21, 13, -1, 13,
-2, 13, -3, 13, -5, 13, -8, 13, -13, 13,
-17, 13, -21, 13, 0, 21, 1, 21, 2, 21,
3, 21, 5, 21, 8, 21, 13, 21, 21, 21,
-1, 21, -2, 21, -3, 21, -5, 21, -8, 21,
-13, 21, -17, 21, -21, 21, 0, -1, 1, -1,
2, -1, 3, -1, 5, -1, 8, -1, 13, -1,
21, -1, -1, -1, -2, -1, -3, -1, -5, -1,
-8, -1, -13, -1, -17, -1, -21, -1, 0, -2,
1, -2, 2, -2, 3, -2, 5, -2, 8, -2,
13, -2, 21, -2, -1, -2, -2, -2, -3, -2,
-5, -2, -8, -2, -13, -2, -17, -2, -21, -2,
0, -3, 1, -3, 2, -3, 3, -3, 5, -3,
8, -3, 13, -3, 21, -3, -1, -3, -2, -3,
-3, -3, -5, -3, -8, -3, -13, -3, -17, -3,
-21, -3, 0, -5, 1, -5, 2, -5, 3, -5,
5, -5, 8, -5, 13, -5, 21, -5, -1, -5,
-2, -5, -3, -5, -5, -5, -8, -5, -13, -5,
-17, -5, -21, -5, 0, -8, 1, -8, 2, -8,
3, -8, 5, -8, 8, -8, 13, -8, 21, -8,
-1, -8, -2, -8, -3, -8, -5, -8, -8, -8,
-13, -8, -17, -8, -21, -8, 0, -13, 1, -13,
2, -13, 3, -13, 5, -13, 8, -13, 13, -13,
21, -13, -1, -13, -2, -13, -3, -13, -5, -13,
-8, -13, -13, -13, -17, -13, -21, -13, 0, -17,
1, -17, 2, -17, 3, -17, 5, -17, 8, -17,
13, -17, 21, -17, -1, -17, -2, -17, -3, -17,
-5, -17, -8, -17, -13, -17, -17, -17, -21, -17,
0, -21, 1, -21, 2, -21, 3, -21, 5, -21,
8, -21, 13, -21, 21, -21, -1, -21, -2, -21,
-3, -21, -5, -21, -8, -21, -13, -21, -17, -21,
0, 0, -8, -29, 8, -29, -18, -25, 17, -25,
0, -23, -6, -22, 6, -22, -13, -19, 12, -19,
0, -18, 25, -18, -25, -17, -5, -17, 5, -17,
-10, -15, 10, -15, 0, -14, -4, -13, 4, -13,
19, -13, -19, -12, -8, -11, -2, -11, 0, -11,
2, -11, 8, -11, -15, -10, -4, -10, 4, -10,
15, -10, -6, -9, -1, -9, 1, -9, 6, -9,
-29, -8, -11, -8, -8, -8, -3, -8, 3, -8,
8, -8, 11, -8, 29, -8, -5, -7, -2, -7,
0, -7, 2, -7, 5, -7, -22, -6, -9, -6,
-6, -6, -3, -6, -1, -6, 1, -6, 3, -6,
6, -6, 9, -6, 22, -6, -17, -5, -7, -5,
-4, -5, -2, -5, 0, -5, 2, -5, 4, -5,
7, -5, 17, -5, -13, -4, -10, -4, -5, -4,
-3, -4, -1, -4, 0, -4, 1, -4, 3, -4,
5, -4, 10, -4, 13, -4, -8, -3, -6, -3,
-4, -3, -3, -3, -2, -3, -1, -3, 0, -3,
1, -3, 2, -3, 4, -3, 6, -3, 8, -3,
-11, -2, -7, -2, -5, -2, -3, -2, -2, -2,
-1, -2, 0, -2, 1, -2, 2, -2, 3, -2,
5, -2, 7, -2, 11, -2, -9, -1, -6, -1,
-4, -1, -3, -1, -2, -1, -1, -1, 0, -1,
1, -1, 2, -1, 3, -1, 4, -1, 6, -1,
9, -1, -31, 0, -23, 0, -18, 0, -14, 0,
-11, 0, -7, 0, -5, 0, -4, 0, -3, 0,
-2, 0, -1, 0, 0, -31, 1, 0, 2, 0,
3, 0, 4, 0, 5, 0, 7, 0, 11, 0,
14, 0, 18, 0, 23, 0, 31, 0, -9, 1,
-6, 1, -4, 1, -3, 1, -2, 1, -1, 1,
0, 1, 1, 1, 2, 1, 3, 1, 4, 1,
6, 1, 9, 1, -11, 2, -7, 2, -5, 2,
-3, 2, -2, 2, -1, 2, 0, 2, 1, 2,
2, 2, 3, 2, 5, 2, 7, 2, 11, 2,
-8, 3, -6, 3, -4, 3, -2, 3, -1, 3,
0, 3, 1, 3, 2, 3, 3, 3, 4, 3,
6, 3, 8, 3, -13, 4, -10, 4, -5, 4,
-3, 4, -1, 4, 0, 4, 1, 4, 3, 4,
5, 4, 10, 4, 13, 4, -17, 5, -7, 5,
-4, 5, -2, 5, 0, 5, 2, 5, 4, 5,
7, 5, 17, 5, -22, 6, -9, 6, -6, 6,
-3, 6, -1, 6, 1, 6, 3, 6, 6, 6,
9, 6, 22, 6, -5, 7, -2, 7, 0, 7,
2, 7, 5, 7, -29, 8, -11, 8, -8, 8,
-3, 8, 3, 8, 8, 8, 11, 8, 29, 8,
-6, 9, -1, 9, 1, 9, 6, 9, -15, 10,
-4, 10, 4, 10, 15, 10, -8, 11, -2, 11,
0, 11, 2, 11, 8, 11, 19, 12, -19, 13,
-4, 13, 4, 13, 0, 14, -10, 15, 10, 15,
-5, 17, 5, 17, 25, 17, -25, 18, 0, 18,
-12, 19, 13, 19, -6, 22, 6, 22, 0, 23,
-17, 25, 18, 25, -8, 29, 8, 29, 0, 31,
0, 0, -6, -22, 6, -22, -13, -19, 12, -19,
0, -18, -5, -17, 5, -17, -10, -15, 10, -15,
0, -14, -4, -13, 4, -13, 19, -13, -19, -12,
-8, -11, -2, -11, 0, -11, 2, -11, 8, -11,
-15, -10, -4, -10, 4, -10, 15, -10, -6, -9,
-1, -9, 1, -9, 6, -9, -11, -8, -8, -8,
-3, -8, 0, -8, 3, -8, 8, -8, 11, -8,
-5, -7, -2, -7, 0, -7, 2, -7, 5, -7,
-22, -6, -9, -6, -6, -6, -3, -6, -1, -6,
1, -6, 3, -6, 6, -6, 9, -6, 22, -6,
-17, -5, -7, -5, -4, -5, -2, -5, -1, -5,
0, -5, 1, -5, 2, -5, 4, -5, 7, -5,
17, -5, -13, -4, -10, -4, -5, -4, -3, -4,
-2, -4, -1, -4, 0, -4, 1, -4, 2, -4,
3, -4, 5, -4, 10, -4, 13, -4, -8, -3,
-6, -3, -4, -3, -3, -3, -2, -3, -1, -3,
0, -3, 1, -3, 2, -3, 3, -3, 4, -3,
6, -3, 8, -3, -11, -2, -7, -2, -5, -2,
-4, -2, -3, -2, -2, -2, -1, -2, 0, -2,
1, -2, 2, -2, 3, -2, 4, -2, 5, -2,
7, -2, 11, -2, -9, -1, -6, -1, -5, -1,
-4, -1, -3, -1, -2, -1, -1, -1, 0, -1,
1, -1, 2, -1, 3, -1, 4, -1, 5, -1,
6, -1, 9, -1, -23, 0, -18, 0, -14, 0,
-11, 0, -7, 0, -5, 0, -4, 0, -3, 0,
-2, 0, -1, 0, 0, -23, 1, 0, 2, 0,
3, 0, 4, 0, 5, 0, 7, 0, 11, 0,
14, 0, 18, 0, 23, 0, -9, 1, -6, 1,
-5, 1, -4, 1, -3, 1, -2, 1, -1, 1,
0, 1, 1, 1, 2, 1, 3, 1, 4, 1,
5, 1, 6, 1, 9, 1, -11, 2, -7, 2,
-5, 2, -4, 2, -3, 2, -2, 2, -1, 2,
0, 2, 1, 2, 2, 2, 3, 2, 4, 2,
5, 2, 7, 2, 11, 2, -8, 3, -6, 3,
-4, 3, -3, 3, -2, 3, -1, 3, 0, 3,
1, 3, 2, 3, 3, 3, 4, 3, 6, 3,
8, 3, -13, 4, -10, 4, -5, 4, -3, 4,
-2, 4, -1, 4, 0, 4, 1, 4, 2, 4,
3, 4, 5, 4, 10, 4, 13, 4, -17, 5,
-7, 5, -4, 5, -2, 5, -1, 5, 0, 5,
1, 5, 2, 5, 4, 5, 7, 5, 17, 5,
-22, 6, -9, 6, -6, 6, -3, 6, -1, 6,
1, 6, 3, 6, 6, 6, 9, 6, 22, 6,
-5, 7, -2, 7, 0, 7, 2, 7, 5, 7,
-11, 8, -8, 8, -3, 8, 0, 8, 3, 8,
8, 8, 11, 8, -6, 9, -1, 9, 1, 9,
6, 9, -15, 10, -4, 10, 4, 10, 15, 10,
-8, 11, -2, 11, 0, 11, 2, 11, 8, 11,
19, 12, -19, 13, -4, 13, 4, 13, 0, 14,
-10, 15, 10, 15, -5, 17, 5, 17, 0, 18,
-12, 19, 13, 19, -6, 22, 6, 22, 0, 23,
};
typedef struct SANMVideoContext {
AVCodecContext *avctx;
GetByteContext gb;
int version, subversion;
uint32_t pal[PALETTE_SIZE];
int16_t delta_pal[PALETTE_DELTA];
ptrdiff_t pitch;
int width, height;
int aligned_width, aligned_height;
int prev_seq;
AVFrame *frame;
uint16_t *frm0, *frm1, *frm2;
uint8_t *stored_frame;
uint32_t frm0_size, frm1_size, frm2_size;
uint32_t stored_frame_size;
uint8_t *rle_buf;
unsigned int rle_buf_size;
int rotate_code;
long npixels, buf_size;
uint16_t codebook[256];
uint16_t small_codebook[4];
int8_t p4x4glyphs[NGLYPHS][16];
int8_t p8x8glyphs[NGLYPHS][64];
} SANMVideoContext;
typedef struct SANMFrameHeader {
int seq_num, codec, rotate_code, rle_output_size;
uint16_t bg_color;
uint32_t width, height;
} SANMFrameHeader;
enum GlyphEdge {
LEFT_EDGE,
TOP_EDGE,
RIGHT_EDGE,
BOTTOM_EDGE,
NO_EDGE
};
enum GlyphDir {
DIR_LEFT,
DIR_UP,
DIR_RIGHT,
DIR_DOWN,
NO_DIR
};
/**
* Return enum GlyphEdge of box where point (x, y) lies.
*
* @param x x point coordinate
* @param y y point coordinate
* @param edge_size box width/height.
*/
static enum GlyphEdge which_edge(int x, int y, int edge_size)
{
const int edge_max = edge_size - 1;
if (!y)
return BOTTOM_EDGE;
else if (y == edge_max)
return TOP_EDGE;
else if (!x)
return LEFT_EDGE;
else if (x == edge_max)
return RIGHT_EDGE;
else
return NO_EDGE;
}
static enum GlyphDir which_direction(enum GlyphEdge edge0, enum GlyphEdge edge1)
{
if ((edge0 == LEFT_EDGE && edge1 == RIGHT_EDGE) ||
(edge1 == LEFT_EDGE && edge0 == RIGHT_EDGE) ||
(edge0 == BOTTOM_EDGE && edge1 != TOP_EDGE) ||
(edge1 == BOTTOM_EDGE && edge0 != TOP_EDGE))
return DIR_UP;
else if ((edge0 == TOP_EDGE && edge1 != BOTTOM_EDGE) ||
(edge1 == TOP_EDGE && edge0 != BOTTOM_EDGE))
return DIR_DOWN;
else if ((edge0 == LEFT_EDGE && edge1 != RIGHT_EDGE) ||
(edge1 == LEFT_EDGE && edge0 != RIGHT_EDGE))
return DIR_LEFT;
else if ((edge0 == TOP_EDGE && edge1 == BOTTOM_EDGE) ||
(edge1 == TOP_EDGE && edge0 == BOTTOM_EDGE) ||
(edge0 == RIGHT_EDGE && edge1 != LEFT_EDGE) ||
(edge1 == RIGHT_EDGE && edge0 != LEFT_EDGE))
return DIR_RIGHT;
return NO_DIR;
}
/* Interpolate two points. */
static void interp_point(int8_t *points, int x0, int y0, int x1, int y1,
int pos, int npoints)
{
if (npoints) {
points[0] = (x0 * pos + x1 * (npoints - pos) + (npoints >> 1)) / npoints;
points[1] = (y0 * pos + y1 * (npoints - pos) + (npoints >> 1)) / npoints;
} else {
points[0] = x0;
points[1] = y0;
}
}
/**
* Construct glyphs by iterating through vector coordinates.
*
* @param pglyphs pointer to table where glyphs are stored
* @param xvec pointer to x component of vector coordinates
* @param yvec pointer to y component of vector coordinates
* @param side_length glyph width/height.
*/
static void make_glyphs(int8_t *pglyphs, const int8_t *xvec, const int8_t *yvec,
const int side_length)
{
const int glyph_size = side_length * side_length;
int8_t *pglyph = pglyphs;
int i, j;
for (i = 0; i < GLYPH_COORD_VECT_SIZE; i++) {
int x0 = xvec[i];
int y0 = yvec[i];
enum GlyphEdge edge0 = which_edge(x0, y0, side_length);
for (j = 0; j < GLYPH_COORD_VECT_SIZE; j++, pglyph += glyph_size) {
int x1 = xvec[j];
int y1 = yvec[j];
enum GlyphEdge edge1 = which_edge(x1, y1, side_length);
enum GlyphDir dir = which_direction(edge0, edge1);
int npoints = FFMAX(FFABS(x1 - x0), FFABS(y1 - y0));
int ipoint;
for (ipoint = 0; ipoint <= npoints; ipoint++) {
int8_t point[2];
int irow, icol;
interp_point(point, x0, y0, x1, y1, ipoint, npoints);
switch (dir) {
case DIR_UP:
for (irow = point[1]; irow >= 0; irow--)
pglyph[point[0] + irow * side_length] = 1;
break;
case DIR_DOWN:
for (irow = point[1]; irow < side_length; irow++)
pglyph[point[0] + irow * side_length] = 1;
break;
case DIR_LEFT:
for (icol = point[0]; icol >= 0; icol--)
pglyph[icol + point[1] * side_length] = 1;
break;
case DIR_RIGHT:
for (icol = point[0]; icol < side_length; icol++)
pglyph[icol + point[1] * side_length] = 1;
break;
}
}
}
}
}
static void init_sizes(SANMVideoContext *ctx, int width, int height)
{
ctx->width = width;
ctx->height = height;
ctx->npixels = width * height;
ctx->aligned_width = FFALIGN(width, 8);
ctx->aligned_height = FFALIGN(height, 8);
ctx->buf_size = ctx->aligned_width * ctx->aligned_height * sizeof(ctx->frm0[0]);
ctx->pitch = width;
}
static void destroy_buffers(SANMVideoContext *ctx)
{
av_freep(&ctx->frm0);
av_freep(&ctx->frm1);
av_freep(&ctx->frm2);
av_freep(&ctx->stored_frame);
av_freep(&ctx->rle_buf);
ctx->frm0_size =
ctx->frm1_size =
ctx->frm2_size = 0;
init_sizes(ctx, 0, 0);
}
static av_cold int init_buffers(SANMVideoContext *ctx)
{
av_fast_padded_mallocz(&ctx->frm0, &ctx->frm0_size, ctx->buf_size);
av_fast_padded_mallocz(&ctx->frm1, &ctx->frm1_size, ctx->buf_size);
av_fast_padded_mallocz(&ctx->frm2, &ctx->frm2_size, ctx->buf_size);
if (!ctx->version)
av_fast_padded_mallocz(&ctx->stored_frame,
&ctx->stored_frame_size, ctx->buf_size);
if (!ctx->frm0 || !ctx->frm1 || !ctx->frm2 ||
(!ctx->stored_frame && !ctx->version)) {
destroy_buffers(ctx);
return AVERROR(ENOMEM);
}
return 0;
}
static void rotate_bufs(SANMVideoContext *ctx, int rotate_code)
{
if (rotate_code == 2)
FFSWAP(uint16_t*, ctx->frm1, ctx->frm2);
FFSWAP(uint16_t*, ctx->frm2, ctx->frm0);
}
static av_cold int decode_init(AVCodecContext *avctx)
{
SANMVideoContext *ctx = avctx->priv_data;
ctx->avctx = avctx;
ctx->version = !avctx->extradata_size;
// early sanity check before allocations to avoid need for deallocation code.
if (!ctx->version && avctx->extradata_size < 1026) {
av_log(avctx, AV_LOG_ERROR, "Not enough extradata.\n");
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = ctx->version ? AV_PIX_FMT_RGB565 : AV_PIX_FMT_PAL8;
init_sizes(ctx, avctx->width, avctx->height);
if (init_buffers(ctx)) {
av_log(avctx, AV_LOG_ERROR, "Error allocating buffers.\n");
return AVERROR(ENOMEM);
}
make_glyphs(ctx->p4x4glyphs[0], glyph4_x, glyph4_y, 4);
make_glyphs(ctx->p8x8glyphs[0], glyph8_x, glyph8_y, 8);
if (!ctx->version) {
int i;
ctx->subversion = AV_RL16(avctx->extradata);
for (i = 0; i < PALETTE_SIZE; i++)
ctx->pal[i] = 0xFFU << 24 | AV_RL32(avctx->extradata + 2 + i * 4);
}
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
SANMVideoContext *ctx = avctx->priv_data;
destroy_buffers(ctx);
return 0;
}
static int rle_decode(SANMVideoContext *ctx, uint8_t *dst, const int out_size)
{
int opcode, color, run_len, left = out_size;
while (left > 0) {
opcode = bytestream2_get_byte(&ctx->gb);
run_len = (opcode >> 1) + 1;
if (run_len > left || bytestream2_get_bytes_left(&ctx->gb) <= 0)
return AVERROR_INVALIDDATA;
if (opcode & 1) {
color = bytestream2_get_byte(&ctx->gb);
memset(dst, color, run_len);
} else {
if (bytestream2_get_bytes_left(&ctx->gb) < run_len)
return AVERROR_INVALIDDATA;
bytestream2_get_bufferu(&ctx->gb, dst, run_len);
}
dst += run_len;
left -= run_len;
}
return 0;
}
static int old_codec1(SANMVideoContext *ctx, int top,
int left, int width, int height)
{
uint8_t *dst = ((uint8_t *)ctx->frm0) + left + top * ctx->pitch;
int i, j, len, flag, code, val, pos, end;
for (i = 0; i < height; i++) {
pos = 0;
if (bytestream2_get_bytes_left(&ctx->gb) < 2)
return AVERROR_INVALIDDATA;
len = bytestream2_get_le16u(&ctx->gb);
end = bytestream2_tell(&ctx->gb) + len;
while (bytestream2_tell(&ctx->gb) < end) {
if (bytestream2_get_bytes_left(&ctx->gb) < 2)
return AVERROR_INVALIDDATA;
code = bytestream2_get_byteu(&ctx->gb);
flag = code & 1;
code = (code >> 1) + 1;
if (pos + code > width)
return AVERROR_INVALIDDATA;
if (flag) {
val = bytestream2_get_byteu(&ctx->gb);
if (val)
memset(dst + pos, val, code);
pos += code;
} else {
if (bytestream2_get_bytes_left(&ctx->gb) < code)
return AVERROR_INVALIDDATA;
for (j = 0; j < code; j++) {
val = bytestream2_get_byteu(&ctx->gb);
if (val)
dst[pos] = val;
pos++;
}
}
}
dst += ctx->pitch;
}
ctx->rotate_code = 0;
return 0;
}
static inline void codec37_mv(uint8_t *dst, const uint8_t *src,
int height, int stride, int x, int y)
{
int pos, i, j;
pos = x + y * stride;
for (j = 0; j < 4; j++) {
for (i = 0; i < 4; i++) {
if ((pos + i) < 0 || (pos + i) >= height * stride)
dst[i] = 0;
else
dst[i] = src[i];
}
dst += stride;
src += stride;
pos += stride;
}
}
static int old_codec37(SANMVideoContext *ctx, int top,
int left, int width, int height)
{
ptrdiff_t stride = ctx->pitch;
int i, j, k, t;
uint8_t *dst, *prev;
int skip_run = 0;
int compr = bytestream2_get_byte(&ctx->gb);
int mvoff = bytestream2_get_byte(&ctx->gb);
int seq = bytestream2_get_le16(&ctx->gb);
uint32_t decoded_size = bytestream2_get_le32(&ctx->gb);
int flags;
bytestream2_skip(&ctx->gb, 4);
flags = bytestream2_get_byte(&ctx->gb);
bytestream2_skip(&ctx->gb, 3);
if (decoded_size > ctx->height * stride - left - top * stride) {
decoded_size = ctx->height * stride - left - top * stride;
av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");
}
ctx->rotate_code = 0;
if (((seq & 1) || !(flags & 1)) && (compr && compr != 2))
rotate_bufs(ctx, 1);
dst = ((uint8_t*)ctx->frm0) + left + top * stride;
prev = ((uint8_t*)ctx->frm2) + left + top * stride;
if (mvoff > 2) {
av_log(ctx->avctx, AV_LOG_ERROR, "Invalid motion base value %d.\n", mvoff);
return AVERROR_INVALIDDATA;
}
switch (compr) {
case 0:
for (i = 0; i < height; i++) {
bytestream2_get_buffer(&ctx->gb, dst, width);
dst += stride;
}
memset(ctx->frm1, 0, ctx->height * stride);
memset(ctx->frm2, 0, ctx->height * stride);
break;
case 2:
if (rle_decode(ctx, dst, decoded_size))
return AVERROR_INVALIDDATA;
memset(ctx->frm1, 0, ctx->frm1_size);
memset(ctx->frm2, 0, ctx->frm2_size);
break;
case 3:
case 4:
if (flags & 4) {
for (j = 0; j < height; j += 4) {
for (i = 0; i < width; i += 4) {
int code;
if (skip_run) {
skip_run--;
copy_block4(dst + i, prev + i, stride, stride, 4);
continue;
}
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
code = bytestream2_get_byteu(&ctx->gb);
switch (code) {
case 0xFF:
if (bytestream2_get_bytes_left(&ctx->gb) < 16)
return AVERROR_INVALIDDATA;
for (k = 0; k < 4; k++)
bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
break;
case 0xFE:
if (bytestream2_get_bytes_left(&ctx->gb) < 4)
return AVERROR_INVALIDDATA;
for (k = 0; k < 4; k++)
memset(dst + i + k * stride, bytestream2_get_byteu(&ctx->gb), 4);
break;
case 0xFD:
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
t = bytestream2_get_byteu(&ctx->gb);
for (k = 0; k < 4; k++)
memset(dst + i + k * stride, t, 4);
break;
default:
if (compr == 4 && !code) {
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
i -= 4;
} else {
int mx, my;
mx = c37_mv[(mvoff * 255 + code) * 2];
my = c37_mv[(mvoff * 255 + code) * 2 + 1];
codec37_mv(dst + i, prev + i + mx + my * stride,
ctx->height, stride, i + mx, j + my);
}
}
}
dst += stride * 4;
prev += stride * 4;
}
} else {
for (j = 0; j < height; j += 4) {
for (i = 0; i < width; i += 4) {
int code;
if (skip_run) {
skip_run--;
copy_block4(dst + i, prev + i, stride, stride, 4);
continue;
}
code = bytestream2_get_byte(&ctx->gb);
if (code == 0xFF) {
if (bytestream2_get_bytes_left(&ctx->gb) < 16)
return AVERROR_INVALIDDATA;
for (k = 0; k < 4; k++)
bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
} else if (compr == 4 && !code) {
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
i -= 4;
} else {
int mx, my;
mx = c37_mv[(mvoff * 255 + code) * 2];
my = c37_mv[(mvoff * 255 + code) * 2 + 1];
codec37_mv(dst + i, prev + i + mx + my * stride,
ctx->height, stride, i + mx, j + my);
}
}
dst += stride * 4;
prev += stride * 4;
}
}
break;
default:
avpriv_report_missing_feature(ctx->avctx,
"Subcodec 37 compression %d", compr);
return AVERROR_PATCHWELCOME;
}
return 0;
}
static int process_block(SANMVideoContext *ctx, uint8_t *dst, uint8_t *prev1,
uint8_t *prev2, int stride, int tbl, int size)
{
int code, k, t;
uint8_t colors[2];
int8_t *pglyph;
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
code = bytestream2_get_byteu(&ctx->gb);
if (code >= 0xF8) {
switch (code) {
case 0xFF:
if (size == 2) {
if (bytestream2_get_bytes_left(&ctx->gb) < 4)
return AVERROR_INVALIDDATA;
dst[0] = bytestream2_get_byteu(&ctx->gb);
dst[1] = bytestream2_get_byteu(&ctx->gb);
dst[0 + stride] = bytestream2_get_byteu(&ctx->gb);
dst[1 + stride] = bytestream2_get_byteu(&ctx->gb);
} else {
size >>= 1;
if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
return AVERROR_INVALIDDATA;
if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
stride, tbl, size))
return AVERROR_INVALIDDATA;
dst += size * stride;
prev1 += size * stride;
prev2 += size * stride;
if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
return AVERROR_INVALIDDATA;
if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
stride, tbl, size))
return AVERROR_INVALIDDATA;
}
break;
case 0xFE:
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
t = bytestream2_get_byteu(&ctx->gb);
for (k = 0; k < size; k++)
memset(dst + k * stride, t, size);
break;
case 0xFD:
if (bytestream2_get_bytes_left(&ctx->gb) < 3)
return AVERROR_INVALIDDATA;
code = bytestream2_get_byteu(&ctx->gb);
pglyph = (size == 8) ? ctx->p8x8glyphs[code] : ctx->p4x4glyphs[code];
bytestream2_get_bufferu(&ctx->gb, colors, 2);
for (k = 0; k < size; k++)
for (t = 0; t < size; t++)
dst[t + k * stride] = colors[!*pglyph++];
break;
case 0xFC:
for (k = 0; k < size; k++)
memcpy(dst + k * stride, prev1 + k * stride, size);
break;
default:
k = bytestream2_tell(&ctx->gb);
bytestream2_seek(&ctx->gb, tbl + (code & 7), SEEK_SET);
t = bytestream2_get_byte(&ctx->gb);
bytestream2_seek(&ctx->gb, k, SEEK_SET);
for (k = 0; k < size; k++)
memset(dst + k * stride, t, size);
}
} else {
int mx = motion_vectors[code][0];
int my = motion_vectors[code][1];
int index = prev2 - (const uint8_t *)ctx->frm2;
av_assert2(index >= 0 && index < (ctx->buf_size >> 1));
if (index < -mx - my * stride ||
(ctx->buf_size >> 1) - index < mx + size + (my + size - 1) * stride) {
av_log(ctx->avctx, AV_LOG_ERROR, "MV is invalid.\n");
return AVERROR_INVALIDDATA;
}
for (k = 0; k < size; k++)
memcpy(dst + k * stride, prev2 + mx + (my + k) * stride, size);
}
return 0;
}
static int old_codec47(SANMVideoContext *ctx, int top,
int left, int width, int height)
{
uint32_t decoded_size;
int i, j;
ptrdiff_t stride = ctx->pitch;
uint8_t *dst = (uint8_t *)ctx->frm0 + left + top * stride;
uint8_t *prev1 = (uint8_t *)ctx->frm1;
uint8_t *prev2 = (uint8_t *)ctx->frm2;
int tbl_pos = bytestream2_tell(&ctx->gb);
int seq = bytestream2_get_le16(&ctx->gb);
int compr = bytestream2_get_byte(&ctx->gb);
int new_rot = bytestream2_get_byte(&ctx->gb);
int skip = bytestream2_get_byte(&ctx->gb);
bytestream2_skip(&ctx->gb, 9);
decoded_size = bytestream2_get_le32(&ctx->gb);
bytestream2_skip(&ctx->gb, 8);
if (decoded_size > ctx->height * stride - left - top * stride) {
decoded_size = ctx->height * stride - left - top * stride;
av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");
}
if (skip & 1)
bytestream2_skip(&ctx->gb, 0x8080);
if (!seq) {
ctx->prev_seq = -1;
memset(prev1, 0, ctx->height * stride);
memset(prev2, 0, ctx->height * stride);
}
switch (compr) {
case 0:
if (bytestream2_get_bytes_left(&ctx->gb) < width * height)
return AVERROR_INVALIDDATA;
for (j = 0; j < height; j++) {
bytestream2_get_bufferu(&ctx->gb, dst, width);
dst += stride;
}
break;
case 1:
if (bytestream2_get_bytes_left(&ctx->gb) < ((width + 1) >> 1) * ((height + 1) >> 1))
return AVERROR_INVALIDDATA;
for (j = 0; j < height; j += 2) {
for (i = 0; i < width; i += 2) {
dst[i] =
dst[i + 1] =
dst[stride + i] =
dst[stride + i + 1] = bytestream2_get_byteu(&ctx->gb);
}
dst += stride * 2;
}
break;
case 2:
if (seq == ctx->prev_seq + 1) {
for (j = 0; j < height; j += 8) {
for (i = 0; i < width; i += 8)
if (process_block(ctx, dst + i, prev1 + i, prev2 + i, stride,
tbl_pos + 8, 8))
return AVERROR_INVALIDDATA;
dst += stride * 8;
prev1 += stride * 8;
prev2 += stride * 8;
}
}
break;
case 3:
memcpy(ctx->frm0, ctx->frm2, ctx->pitch * ctx->height);
break;
case 4:
memcpy(ctx->frm0, ctx->frm1, ctx->pitch * ctx->height);
break;
case 5:
if (rle_decode(ctx, dst, decoded_size))
return AVERROR_INVALIDDATA;
break;
default:
avpriv_report_missing_feature(ctx->avctx,
"Subcodec 47 compression %d", compr);
return AVERROR_PATCHWELCOME;
}
if (seq == ctx->prev_seq + 1)
ctx->rotate_code = new_rot;
else
ctx->rotate_code = 0;
ctx->prev_seq = seq;
return 0;
}
static int process_frame_obj(SANMVideoContext *ctx)
{
uint16_t codec = bytestream2_get_le16u(&ctx->gb);
uint16_t left = bytestream2_get_le16u(&ctx->gb);
uint16_t top = bytestream2_get_le16u(&ctx->gb);
uint16_t w = bytestream2_get_le16u(&ctx->gb);
uint16_t h = bytestream2_get_le16u(&ctx->gb);
if (!w || !h) {
av_log(ctx->avctx, AV_LOG_ERROR, "Dimensions are invalid.\n");
return AVERROR_INVALIDDATA;
}
if (ctx->width < left + w || ctx->height < top + h) {
int ret = ff_set_dimensions(ctx->avctx, FFMAX(left + w, ctx->width),
FFMAX(top + h, ctx->height));
if (ret < 0)
return ret;
init_sizes(ctx, FFMAX(left + w, ctx->width),
FFMAX(top + h, ctx->height));
if (init_buffers(ctx)) {
av_log(ctx->avctx, AV_LOG_ERROR, "Error resizing buffers.\n");
return AVERROR(ENOMEM);
}
}
bytestream2_skip(&ctx->gb, 4);
switch (codec) {
case 1:
case 3:
return old_codec1(ctx, top, left, w, h);
case 37:
return old_codec37(ctx, top, left, w, h);
case 47:
return old_codec47(ctx, top, left, w, h);
default:
avpriv_request_sample(ctx->avctx, "Subcodec %d", codec);
return AVERROR_PATCHWELCOME;
}
}
static int decode_0(SANMVideoContext *ctx)
{
uint16_t *frm = ctx->frm0;
int x, y;
if (bytestream2_get_bytes_left(&ctx->gb) < ctx->width * ctx->height * 2) {
av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for raw frame.\n");
return AVERROR_INVALIDDATA;
}
for (y = 0; y < ctx->height; y++) {
for (x = 0; x < ctx->width; x++)
frm[x] = bytestream2_get_le16u(&ctx->gb);
frm += ctx->pitch;
}
return 0;
}
static int decode_nop(SANMVideoContext *ctx)
{
avpriv_request_sample(ctx->avctx, "Unknown/unsupported compression type");
return AVERROR_PATCHWELCOME;
}
static void copy_block(uint16_t *pdest, uint16_t *psrc, int block_size, ptrdiff_t pitch)
{
uint8_t *dst = (uint8_t *)pdest;
uint8_t *src = (uint8_t *)psrc;
ptrdiff_t stride = pitch * 2;
switch (block_size) {
case 2:
copy_block4(dst, src, stride, stride, 2);
break;
case 4:
copy_block8(dst, src, stride, stride, 4);
break;
case 8:
copy_block16(dst, src, stride, stride, 8);
break;
}
}
static void fill_block(uint16_t *pdest, uint16_t color, int block_size, ptrdiff_t pitch)
{
int x, y;
pitch -= block_size;
for (y = 0; y < block_size; y++, pdest += pitch)
for (x = 0; x < block_size; x++)
*pdest++ = color;
}
static int draw_glyph(SANMVideoContext *ctx, uint16_t *dst, int index,
uint16_t fg_color, uint16_t bg_color, int block_size,
ptrdiff_t pitch)
{
int8_t *pglyph;
uint16_t colors[2] = { fg_color, bg_color };
int x, y;
if (index >= NGLYPHS) {
av_log(ctx->avctx, AV_LOG_ERROR, "Ignoring nonexistent glyph #%u.\n", index);
return AVERROR_INVALIDDATA;
}
pglyph = block_size == 8 ? ctx->p8x8glyphs[index] : ctx->p4x4glyphs[index];
pitch -= block_size;
for (y = 0; y < block_size; y++, dst += pitch)
for (x = 0; x < block_size; x++)
*dst++ = colors[*pglyph++];
return 0;
}
static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)
{
uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
if (block_size == 2) {
uint32_t indices;
if (bytestream2_get_bytes_left(&ctx->gb) < 4)
return AVERROR_INVALIDDATA;
indices = bytestream2_get_le32u(&ctx->gb);
dst[0] = ctx->codebook[indices & 0xFF];
indices >>= 8;
dst[1] = ctx->codebook[indices & 0xFF];
indices >>= 8;
dst[pitch] = ctx->codebook[indices & 0xFF];
indices >>= 8;
dst[pitch + 1] = ctx->codebook[indices & 0xFF];
} else {
uint16_t fgcolor, bgcolor;
int glyph;
if (bytestream2_get_bytes_left(&ctx->gb) < 3)
return AVERROR_INVALIDDATA;
glyph = bytestream2_get_byteu(&ctx->gb);
bgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
fgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
}
return 0;
}
static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)
{
uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
if (block_size == 2) {
if (bytestream2_get_bytes_left(&ctx->gb) < 8)
return AVERROR_INVALIDDATA;
dst[0] = bytestream2_get_le16u(&ctx->gb);
dst[1] = bytestream2_get_le16u(&ctx->gb);
dst[pitch] = bytestream2_get_le16u(&ctx->gb);
dst[pitch + 1] = bytestream2_get_le16u(&ctx->gb);
} else {
uint16_t fgcolor, bgcolor;
int glyph;
if (bytestream2_get_bytes_left(&ctx->gb) < 5)
return AVERROR_INVALIDDATA;
glyph = bytestream2_get_byteu(&ctx->gb);
bgcolor = bytestream2_get_le16u(&ctx->gb);
fgcolor = bytestream2_get_le16u(&ctx->gb);
draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
}
return 0;
}
static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my,
int block_size)
{
int start_pos = cx + mx + (cy + my) * ctx->pitch;
int end_pos = start_pos + (block_size - 1) * (ctx->pitch + 1);
int good = start_pos >= 0 && end_pos < (ctx->buf_size >> 1);
if (!good)
av_log(ctx->avctx, AV_LOG_ERROR,
"Ignoring invalid motion vector (%i, %i)->(%u, %u), block size = %u\n",
cx + mx, cy + my, cx, cy, block_size);
return good;
}
static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)
{
int16_t mx, my, index;
int opcode;
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
opcode = bytestream2_get_byteu(&ctx->gb);
switch (opcode) {
default:
mx = motion_vectors[opcode][0];
my = motion_vectors[opcode][1];
if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
copy_block(ctx->frm0 + cx + ctx->pitch * cy,
ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
blk_size, ctx->pitch);
}
break;
case 0xF5:
if (bytestream2_get_bytes_left(&ctx->gb) < 2)
return AVERROR_INVALIDDATA;
index = bytestream2_get_le16u(&ctx->gb);
mx = index % ctx->width;
my = index / ctx->width;
if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
copy_block(ctx->frm0 + cx + ctx->pitch * cy,
ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
blk_size, ctx->pitch);
}
break;
case 0xF6:
copy_block(ctx->frm0 + cx + ctx->pitch * cy,
ctx->frm1 + cx + ctx->pitch * cy,
blk_size, ctx->pitch);
break;
case 0xF7:
opcode_0xf7(ctx, cx, cy, blk_size, ctx->pitch);
break;
case 0xF8:
opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
break;
case 0xF9:
case 0xFA:
case 0xFB:
case 0xFC:
fill_block(ctx->frm0 + cx + cy * ctx->pitch,
ctx->small_codebook[opcode - 0xf9], blk_size, ctx->pitch);
break;
case 0xFD:
if (bytestream2_get_bytes_left(&ctx->gb) < 1)
return AVERROR_INVALIDDATA;
fill_block(ctx->frm0 + cx + cy * ctx->pitch,
ctx->codebook[bytestream2_get_byteu(&ctx->gb)], blk_size, ctx->pitch);
break;
case 0xFE:
if (bytestream2_get_bytes_left(&ctx->gb) < 2)
return AVERROR_INVALIDDATA;
fill_block(ctx->frm0 + cx + cy * ctx->pitch,
bytestream2_get_le16u(&ctx->gb), blk_size, ctx->pitch);
break;
case 0xFF:
if (blk_size == 2) {
opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
} else {
blk_size >>= 1;
if (codec2subblock(ctx, cx, cy, blk_size))
return AVERROR_INVALIDDATA;
if (codec2subblock(ctx, cx + blk_size, cy, blk_size))
return AVERROR_INVALIDDATA;
if (codec2subblock(ctx, cx, cy + blk_size, blk_size))
return AVERROR_INVALIDDATA;
if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))
return AVERROR_INVALIDDATA;
}
break;
}
return 0;
}
static int decode_2(SANMVideoContext *ctx)
{
int cx, cy, ret;
for (cy = 0; cy < ctx->aligned_height; cy += 8)
for (cx = 0; cx < ctx->aligned_width; cx += 8)
if (ret = codec2subblock(ctx, cx, cy, 8))
return ret;
return 0;
}
static int decode_3(SANMVideoContext *ctx)
{
memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);
return 0;
}
static int decode_4(SANMVideoContext *ctx)
{
memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);
return 0;
}
static int decode_5(SANMVideoContext *ctx)
{
#if HAVE_BIGENDIAN
uint16_t *frm;
int npixels;
#endif
uint8_t *dst = (uint8_t*)ctx->frm0;
if (rle_decode(ctx, dst, ctx->buf_size))
return AVERROR_INVALIDDATA;
#if HAVE_BIGENDIAN
npixels = ctx->npixels;
frm = ctx->frm0;
while (npixels--) {
*frm = av_bswap16(*frm);
frm++;
}
#endif
return 0;
}
static int decode_6(SANMVideoContext *ctx)
{
int npixels = ctx->npixels;
uint16_t *frm = ctx->frm0;
if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {
av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for frame.\n");
return AVERROR_INVALIDDATA;
}
while (npixels--)
*frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
return 0;
}
static int decode_8(SANMVideoContext *ctx)
{
uint16_t *pdest = ctx->frm0;
uint8_t *rsrc;
long npixels = ctx->npixels;
av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);
if (!ctx->rle_buf) {
av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed.\n");
return AVERROR(ENOMEM);
}
rsrc = ctx->rle_buf;
if (rle_decode(ctx, rsrc, npixels))
return AVERROR_INVALIDDATA;
while (npixels--)
*pdest++ = ctx->codebook[*rsrc++];
return 0;
}
typedef int (*frm_decoder)(SANMVideoContext *ctx);
static const frm_decoder v1_decoders[] = {
decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,
decode_6, decode_nop, decode_8
};
static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)
{
int i, ret;
if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {
av_log(ctx->avctx, AV_LOG_ERROR, "Input frame too short (%d bytes).\n",
ret);
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&ctx->gb, 8); // skip pad
hdr->width = bytestream2_get_le32u(&ctx->gb);
hdr->height = bytestream2_get_le32u(&ctx->gb);
if (hdr->width != ctx->width || hdr->height != ctx->height) {
avpriv_report_missing_feature(ctx->avctx, "Variable size frames");
return AVERROR_PATCHWELCOME;
}
hdr->seq_num = bytestream2_get_le16u(&ctx->gb);
hdr->codec = bytestream2_get_byteu(&ctx->gb);
hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);
bytestream2_skip(&ctx->gb, 4); // skip pad
for (i = 0; i < 4; i++)
ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);
hdr->bg_color = bytestream2_get_le16u(&ctx->gb);
bytestream2_skip(&ctx->gb, 2); // skip pad
hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);
for (i = 0; i < 256; i++)
ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);
bytestream2_skip(&ctx->gb, 8); // skip pad
return 0;
}
static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)
{
if (buf_size--) {
*pbuf++ = color;
av_memcpy_backptr((uint8_t*)pbuf, 2, 2*buf_size);
}
}
static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)
{
uint8_t *dst;
const uint8_t *src = (uint8_t*) ctx->frm0;
int ret, height = ctx->height;
ptrdiff_t dstpitch, srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);
if ((ret = ff_get_buffer(ctx->avctx, ctx->frame, 0)) < 0)
return ret;
dst = ctx->frame->data[0];
dstpitch = ctx->frame->linesize[0];
while (height--) {
memcpy(dst, src, srcpitch);
src += srcpitch;
dst += dstpitch;
}
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *pkt)
{
SANMVideoContext *ctx = avctx->priv_data;
int i, ret;
ctx->frame = data;
bytestream2_init(&ctx->gb, pkt->data, pkt->size);
if (!ctx->version) {
int to_store = 0;
while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {
uint32_t sig, size;
int pos;
sig = bytestream2_get_be32u(&ctx->gb);
size = bytestream2_get_be32u(&ctx->gb);
pos = bytestream2_tell(&ctx->gb);
if (bytestream2_get_bytes_left(&ctx->gb) < size) {
av_log(avctx, AV_LOG_ERROR, "Incorrect chunk size %"PRIu32".\n", size);
break;
}
switch (sig) {
case MKBETAG('N', 'P', 'A', 'L'):
if (size != PALETTE_SIZE * 3) {
av_log(avctx, AV_LOG_ERROR,
"Incorrect palette block size %"PRIu32".\n", size);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < PALETTE_SIZE; i++)
ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
break;
case MKBETAG('F', 'O', 'B', 'J'):
if (size < 16)
return AVERROR_INVALIDDATA;
if (ret = process_frame_obj(ctx))
return ret;
break;
case MKBETAG('X', 'P', 'A', 'L'):
if (size == 6 || size == 4) {
uint8_t tmp[3];
int j;
for (i = 0; i < PALETTE_SIZE; i++) {
for (j = 0; j < 3; j++) {
int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;
tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);
}
ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);
}
} else {
if (size < PALETTE_DELTA * 2 + 4) {
av_log(avctx, AV_LOG_ERROR,
"Incorrect palette change block size %"PRIu32".\n",
size);
return AVERROR_INVALIDDATA;
}
bytestream2_skipu(&ctx->gb, 4);
for (i = 0; i < PALETTE_DELTA; i++)
ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);
if (size >= PALETTE_DELTA * 5 + 4) {
for (i = 0; i < PALETTE_SIZE; i++)
ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
} else {
memset(ctx->pal, 0, sizeof(ctx->pal));
}
}
break;
case MKBETAG('S', 'T', 'O', 'R'):
to_store = 1;
break;
case MKBETAG('F', 'T', 'C', 'H'):
memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);
break;
default:
bytestream2_skip(&ctx->gb, size);
av_log(avctx, AV_LOG_DEBUG,
"Unknown/unsupported chunk %"PRIx32".\n", sig);
break;
}
bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);
if (size & 1)
bytestream2_skip(&ctx->gb, 1);
}
if (to_store)
memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);
if ((ret = copy_output(ctx, NULL)))
return ret;
memcpy(ctx->frame->data[1], ctx->pal, 1024);
} else {
SANMFrameHeader header;
if ((ret = read_frame_header(ctx, &header)))
return ret;
ctx->rotate_code = header.rotate_code;
if ((ctx->frame->key_frame = !header.seq_num)) {
ctx->frame->pict_type = AV_PICTURE_TYPE_I;
fill_frame(ctx->frm1, ctx->npixels, header.bg_color);
fill_frame(ctx->frm2, ctx->npixels, header.bg_color);
} else {
ctx->frame->pict_type = AV_PICTURE_TYPE_P;
}
if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {
if ((ret = v1_decoders[header.codec](ctx))) {
av_log(avctx, AV_LOG_ERROR,
"Subcodec %d: error decoding frame.\n", header.codec);
return ret;
}
} else {
avpriv_request_sample(avctx, "Subcodec %d", header.codec);
return AVERROR_PATCHWELCOME;
}
if ((ret = copy_output(ctx, &header)))
return ret;
}
if (ctx->rotate_code)
rotate_bufs(ctx, ctx->rotate_code);
*got_frame_ptr = 1;
return pkt->size;
}
const FFCodec ff_sanm_decoder = {
.p.name = "sanm",
.p.long_name = NULL_IF_CONFIG_SMALL("LucasArts SANM/Smush video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_SANM,
.priv_data_size = sizeof(SANMVideoContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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