forked from KolibriOS/kolibrios
683 lines
21 KiB
C
683 lines
21 KiB
C
|
/*
|
||
|
|
* Microsoft Screen 4 (aka Microsoft Expression Encoder Screen) decoder
|
||
|
|
* Copyright (c) 2012 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
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file
|
||
|
|
* Microsoft Screen 4 (aka Microsoft Titanium Screen 2,
|
||
|
|
* aka Microsoft Expression Encoder Screen) decoder
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "avcodec.h"
|
||
|
|
#include "bytestream.h"
|
||
|
|
#include "dsputil.h"
|
||
|
|
#include "get_bits.h"
|
||
|
|
#include "internal.h"
|
||
|
|
#include "mss34dsp.h"
|
||
|
|
#include "unary.h"
|
||
|
|
|
||
|
|
#define HEADER_SIZE 8
|
||
|
|
|
||
|
|
enum FrameType {
|
||
|
|
INTRA_FRAME = 0,
|
||
|
|
INTER_FRAME,
|
||
|
|
SKIP_FRAME
|
||
|
|
};
|
||
|
|
|
||
|
|
enum BlockType {
|
||
|
|
SKIP_BLOCK = 0,
|
||
|
|
DCT_BLOCK,
|
||
|
|
IMAGE_BLOCK,
|
||
|
|
};
|
||
|
|
|
||
|
|
enum CachePos {
|
||
|
|
LEFT = 0,
|
||
|
|
TOP_LEFT,
|
||
|
|
TOP,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t mss4_dc_vlc_lens[2][16] = {
|
||
|
|
{ 0, 1, 5, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0 },
|
||
|
|
{ 0, 3, 1, 1, 1, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0 }
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t mss4_ac_vlc_lens[2][16] = {
|
||
|
|
{ 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 125 },
|
||
|
|
{ 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 119 }
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t mss4_ac_vlc_syms[2][162] = {
|
||
|
|
{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
|
||
|
|
0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
|
||
|
|
0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08,
|
||
|
|
0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0,
|
||
|
|
0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16,
|
||
|
|
0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28,
|
||
|
|
0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
|
||
|
|
0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
|
||
|
|
0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
|
||
|
|
0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
|
||
|
|
0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
|
||
|
|
0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
|
||
|
|
0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
|
||
|
|
0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
|
||
|
|
0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
|
||
|
|
0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5,
|
||
|
|
0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4,
|
||
|
|
0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
|
||
|
|
0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
|
||
|
|
0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
|
||
|
|
0xF9, 0xFA },
|
||
|
|
{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
|
||
|
|
0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
|
||
|
|
0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
|
||
|
|
0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0,
|
||
|
|
0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34,
|
||
|
|
0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26,
|
||
|
|
0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38,
|
||
|
|
0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
|
||
|
|
0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
|
||
|
|
0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
|
||
|
|
0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
|
||
|
|
0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
|
||
|
|
0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96,
|
||
|
|
0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5,
|
||
|
|
0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4,
|
||
|
|
0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3,
|
||
|
|
0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2,
|
||
|
|
0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA,
|
||
|
|
0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,
|
||
|
|
0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
|
||
|
|
0xF9, 0xFA }
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t vec_len_syms[2][4] = {
|
||
|
|
{ 4, 2, 3, 1 },
|
||
|
|
{ 4, 1, 2, 3 }
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t mss4_vec_entry_vlc_lens[2][16] = {
|
||
|
|
{ 0, 2, 2, 3, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
|
||
|
|
{ 0, 1, 5, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t mss4_vec_entry_vlc_syms[2][9] = {
|
||
|
|
{ 0, 7, 6, 5, 8, 4, 3, 1, 2 },
|
||
|
|
{ 0, 2, 3, 4, 5, 6, 7, 1, 8 }
|
||
|
|
};
|
||
|
|
|
||
|
|
#define MAX_ENTRIES 162
|
||
|
|
|
||
|
|
typedef struct MSS4Context {
|
||
|
|
AVFrame *pic;
|
||
|
|
|
||
|
|
VLC dc_vlc[2], ac_vlc[2];
|
||
|
|
VLC vec_entry_vlc[2];
|
||
|
|
int block[64];
|
||
|
|
uint8_t imgbuf[3][16 * 16];
|
||
|
|
|
||
|
|
int quality;
|
||
|
|
uint16_t quant_mat[2][64];
|
||
|
|
|
||
|
|
int *prev_dc[3];
|
||
|
|
int dc_stride[3];
|
||
|
|
int dc_cache[4][4];
|
||
|
|
|
||
|
|
int prev_vec[3][4];
|
||
|
|
} MSS4Context;
|
||
|
|
|
||
|
|
static av_cold int mss4_init_vlc(VLC *vlc, const uint8_t *lens,
|
||
|
|
const uint8_t *syms, int num_syms)
|
||
|
|
{
|
||
|
|
uint8_t bits[MAX_ENTRIES];
|
||
|
|
uint16_t codes[MAX_ENTRIES];
|
||
|
|
int i, j;
|
||
|
|
int prefix = 0, max_bits = 0, idx = 0;
|
||
|
|
|
||
|
|
for (i = 0; i < 16; i++) {
|
||
|
|
for (j = 0; j < lens[i]; j++) {
|
||
|
|
bits[idx] = i + 1;
|
||
|
|
codes[idx] = prefix++;
|
||
|
|
max_bits = i + 1;
|
||
|
|
idx++;
|
||
|
|
}
|
||
|
|
prefix <<= 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ff_init_vlc_sparse(vlc, FFMIN(max_bits, 9), num_syms, bits, 1, 1,
|
||
|
|
codes, 2, 2, syms, 1, 1, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold int mss4_init_vlcs(MSS4Context *ctx)
|
||
|
|
{
|
||
|
|
int ret, i;
|
||
|
|
|
||
|
|
for (i = 0; i < 2; i++) {
|
||
|
|
ret = mss4_init_vlc(&ctx->dc_vlc[i], mss4_dc_vlc_lens[i], NULL, 12);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
ret = mss4_init_vlc(&ctx->ac_vlc[i], mss4_ac_vlc_lens[i],
|
||
|
|
mss4_ac_vlc_syms[i], 162);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
ret = mss4_init_vlc(&ctx->vec_entry_vlc[i], mss4_vec_entry_vlc_lens[i],
|
||
|
|
mss4_vec_entry_vlc_syms[i], 9);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold void mss4_free_vlcs(MSS4Context *ctx)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < 2; i++) {
|
||
|
|
ff_free_vlc(&ctx->dc_vlc[i]);
|
||
|
|
ff_free_vlc(&ctx->ac_vlc[i]);
|
||
|
|
ff_free_vlc(&ctx->vec_entry_vlc[i]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* This function returns values in the range
|
||
|
|
* (-range + 1; -range/2] U [range/2; range - 1)
|
||
|
|
* i.e.
|
||
|
|
* nbits = 0 -> 0
|
||
|
|
* nbits = 1 -> -1, 1
|
||
|
|
* nbits = 2 -> -3, -2, 2, 3
|
||
|
|
*/
|
||
|
|
static av_always_inline int get_coeff_bits(GetBitContext *gb, int nbits)
|
||
|
|
{
|
||
|
|
int val;
|
||
|
|
|
||
|
|
if (!nbits)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
val = get_bits(gb, nbits);
|
||
|
|
if (val < (1 << (nbits - 1)))
|
||
|
|
val -= (1 << nbits) - 1;
|
||
|
|
|
||
|
|
return val;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int get_coeff(GetBitContext *gb, VLC *vlc)
|
||
|
|
{
|
||
|
|
int val = get_vlc2(gb, vlc->table, vlc->bits, 2);
|
||
|
|
|
||
|
|
return get_coeff_bits(gb, val);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int mss4_decode_dct(GetBitContext *gb, VLC *dc_vlc, VLC *ac_vlc,
|
||
|
|
int *block, int *dc_cache,
|
||
|
|
int bx, int by, uint16_t *quant_mat)
|
||
|
|
{
|
||
|
|
int skip, val, pos = 1, zz_pos, dc;
|
||
|
|
|
||
|
|
memset(block, 0, sizeof(*block) * 64);
|
||
|
|
|
||
|
|
dc = get_coeff(gb, dc_vlc);
|
||
|
|
// DC prediction is the same as in MSS3
|
||
|
|
if (by) {
|
||
|
|
if (bx) {
|
||
|
|
int l, tl, t;
|
||
|
|
|
||
|
|
l = dc_cache[LEFT];
|
||
|
|
tl = dc_cache[TOP_LEFT];
|
||
|
|
t = dc_cache[TOP];
|
||
|
|
|
||
|
|
if (FFABS(t - tl) <= FFABS(l - tl))
|
||
|
|
dc += l;
|
||
|
|
else
|
||
|
|
dc += t;
|
||
|
|
} else {
|
||
|
|
dc += dc_cache[TOP];
|
||
|
|
}
|
||
|
|
} else if (bx) {
|
||
|
|
dc += dc_cache[LEFT];
|
||
|
|
}
|
||
|
|
dc_cache[LEFT] = dc;
|
||
|
|
block[0] = dc * quant_mat[0];
|
||
|
|
|
||
|
|
while (pos < 64) {
|
||
|
|
val = get_vlc2(gb, ac_vlc->table, 9, 2);
|
||
|
|
if (!val)
|
||
|
|
return 0;
|
||
|
|
if (val == -1)
|
||
|
|
return -1;
|
||
|
|
if (val == 0xF0) {
|
||
|
|
pos += 16;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
skip = val >> 4;
|
||
|
|
val = get_coeff_bits(gb, val & 0xF);
|
||
|
|
pos += skip;
|
||
|
|
if (pos >= 64)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
zz_pos = ff_zigzag_direct[pos];
|
||
|
|
block[zz_pos] = val * quant_mat[zz_pos];
|
||
|
|
pos++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return pos == 64 ? 0 : -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int mss4_decode_dct_block(MSS4Context *c, GetBitContext *gb,
|
||
|
|
uint8_t *dst[3], int mb_x, int mb_y)
|
||
|
|
{
|
||
|
|
int i, j, k, ret;
|
||
|
|
uint8_t *out = dst[0];
|
||
|
|
|
||
|
|
for (j = 0; j < 2; j++) {
|
||
|
|
for (i = 0; i < 2; i++) {
|
||
|
|
int xpos = mb_x * 2 + i;
|
||
|
|
c->dc_cache[j][TOP_LEFT] = c->dc_cache[j][TOP];
|
||
|
|
c->dc_cache[j][TOP] = c->prev_dc[0][mb_x * 2 + i];
|
||
|
|
ret = mss4_decode_dct(gb, c->dc_vlc, c->ac_vlc, c->block,
|
||
|
|
c->dc_cache[j],
|
||
|
|
xpos, mb_y * 2 + j, c->quant_mat[0]);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
c->prev_dc[0][mb_x * 2 + i] = c->dc_cache[j][LEFT];
|
||
|
|
|
||
|
|
ff_mss34_dct_put(out + xpos * 8, c->pic->linesize[0],
|
||
|
|
c->block);
|
||
|
|
}
|
||
|
|
out += 8 * c->pic->linesize[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 1; i < 3; i++) {
|
||
|
|
c->dc_cache[i + 1][TOP_LEFT] = c->dc_cache[i + 1][TOP];
|
||
|
|
c->dc_cache[i + 1][TOP] = c->prev_dc[i][mb_x];
|
||
|
|
ret = mss4_decode_dct(gb, c->dc_vlc + 1, c->ac_vlc + 1,
|
||
|
|
c->block, c->dc_cache[i + 1], mb_x, mb_y,
|
||
|
|
c->quant_mat[1]);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
c->prev_dc[i][mb_x] = c->dc_cache[i + 1][LEFT];
|
||
|
|
|
||
|
|
ff_mss34_dct_put(c->imgbuf[i], 8, c->block);
|
||
|
|
out = dst[i] + mb_x * 16;
|
||
|
|
// Since the DCT block is coded as YUV420 and the whole frame as YUV444,
|
||
|
|
// we need to scale chroma.
|
||
|
|
for (j = 0; j < 16; j++) {
|
||
|
|
for (k = 0; k < 8; k++)
|
||
|
|
AV_WN16A(out + k * 2, c->imgbuf[i][k + (j & ~1) * 4] * 0x101);
|
||
|
|
out += c->pic->linesize[i];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void read_vec_pos(GetBitContext *gb, int *vec_pos, int *sel_flag,
|
||
|
|
int *sel_len, int *prev)
|
||
|
|
{
|
||
|
|
int i, y_flag = 0;
|
||
|
|
|
||
|
|
for (i = 2; i >= 0; i--) {
|
||
|
|
if (!sel_flag[i]) {
|
||
|
|
vec_pos[i] = 0;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if ((!i && !y_flag) || get_bits1(gb)) {
|
||
|
|
if (sel_len[i] > 0) {
|
||
|
|
int pval = prev[i];
|
||
|
|
vec_pos[i] = get_bits(gb, sel_len[i]);
|
||
|
|
if (vec_pos[i] >= pval)
|
||
|
|
vec_pos[i]++;
|
||
|
|
} else {
|
||
|
|
vec_pos[i] = !prev[i];
|
||
|
|
}
|
||
|
|
y_flag = 1;
|
||
|
|
} else {
|
||
|
|
vec_pos[i] = prev[i];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int get_value_cached(GetBitContext *gb, int vec_pos, uint8_t *vec,
|
||
|
|
int vec_size, int component, int shift, int *prev)
|
||
|
|
{
|
||
|
|
if (vec_pos < vec_size)
|
||
|
|
return vec[vec_pos];
|
||
|
|
if (!get_bits1(gb))
|
||
|
|
return prev[component];
|
||
|
|
prev[component] = get_bits(gb, 8 - shift) << shift;
|
||
|
|
return prev[component];
|
||
|
|
}
|
||
|
|
|
||
|
|
#define MKVAL(vals) (vals[0] | (vals[1] << 3) | (vals[2] << 6))
|
||
|
|
|
||
|
|
/* Image mode - the hardest to comprehend MSS4 coding mode.
|
||
|
|
*
|
||
|
|
* In this mode all three 16x16 blocks are coded together with a method
|
||
|
|
* remotely similar to the methods employed in MSS1-MSS3.
|
||
|
|
* The idea is that every component has a vector of 1-4 most common symbols
|
||
|
|
* and an escape mode for reading new value from the bitstream. Decoding
|
||
|
|
* consists of retrieving pixel values from the vector or reading new ones
|
||
|
|
* from the bitstream; depending on flags read from the bitstream, these vector
|
||
|
|
* positions can be updated or reused from the state of the previous line
|
||
|
|
* or previous pixel.
|
||
|
|
*/
|
||
|
|
static int mss4_decode_image_block(MSS4Context *ctx, GetBitContext *gb,
|
||
|
|
uint8_t *picdst[3], int mb_x, int mb_y)
|
||
|
|
{
|
||
|
|
uint8_t vec[3][4];
|
||
|
|
int vec_len[3];
|
||
|
|
int sel_len[3], sel_flag[3];
|
||
|
|
int i, j, k, mode, split;
|
||
|
|
int prev_vec1 = 0, prev_split = 0;
|
||
|
|
int vals[3] = { 0 };
|
||
|
|
int prev_pix[3] = { 0 };
|
||
|
|
int prev_mode[16] = { 0 };
|
||
|
|
uint8_t *dst[3];
|
||
|
|
|
||
|
|
const int val_shift = ctx->quality == 100 ? 0 : 2;
|
||
|
|
|
||
|
|
for (i = 0; i < 3; i++)
|
||
|
|
dst[i] = ctx->imgbuf[i];
|
||
|
|
|
||
|
|
for (i = 0; i < 3; i++) {
|
||
|
|
vec_len[i] = vec_len_syms[!!i][get_unary(gb, 0, 3)];
|
||
|
|
for (j = 0; j < vec_len[i]; j++) {
|
||
|
|
vec[i][j] = get_coeff(gb, &ctx->vec_entry_vlc[!!i]);
|
||
|
|
vec[i][j] += ctx->prev_vec[i][j];
|
||
|
|
ctx->prev_vec[i][j] = vec[i][j];
|
||
|
|
}
|
||
|
|
sel_flag[i] = vec_len[i] > 1;
|
||
|
|
sel_len[i] = vec_len[i] > 2 ? vec_len[i] - 2 : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (j = 0; j < 16; j++) {
|
||
|
|
if (get_bits1(gb)) {
|
||
|
|
split = 0;
|
||
|
|
if (get_bits1(gb)) {
|
||
|
|
prev_mode[0] = 0;
|
||
|
|
vals[0] = vals[1] = vals[2] = 0;
|
||
|
|
mode = 2;
|
||
|
|
} else {
|
||
|
|
mode = get_bits1(gb);
|
||
|
|
if (mode)
|
||
|
|
split = get_bits(gb, 4);
|
||
|
|
}
|
||
|
|
for (i = 0; i < 16; i++) {
|
||
|
|
if (mode <= 1) {
|
||
|
|
vals[0] = prev_mode[i] & 7;
|
||
|
|
vals[1] = (prev_mode[i] >> 3) & 7;
|
||
|
|
vals[2] = prev_mode[i] >> 6;
|
||
|
|
if (mode == 1 && i == split) {
|
||
|
|
read_vec_pos(gb, vals, sel_flag, sel_len, vals);
|
||
|
|
}
|
||
|
|
} else if (mode == 2) {
|
||
|
|
if (get_bits1(gb))
|
||
|
|
read_vec_pos(gb, vals, sel_flag, sel_len, vals);
|
||
|
|
}
|
||
|
|
for (k = 0; k < 3; k++)
|
||
|
|
*dst[k]++ = get_value_cached(gb, vals[k], vec[k],
|
||
|
|
vec_len[k], k,
|
||
|
|
val_shift, prev_pix);
|
||
|
|
prev_mode[i] = MKVAL(vals);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (get_bits1(gb)) {
|
||
|
|
split = get_bits(gb, 4);
|
||
|
|
if (split >= prev_split)
|
||
|
|
split++;
|
||
|
|
prev_split = split;
|
||
|
|
} else {
|
||
|
|
split = prev_split;
|
||
|
|
}
|
||
|
|
if (split) {
|
||
|
|
vals[0] = prev_mode[0] & 7;
|
||
|
|
vals[1] = (prev_mode[0] >> 3) & 7;
|
||
|
|
vals[2] = prev_mode[0] >> 6;
|
||
|
|
for (i = 0; i < 3; i++) {
|
||
|
|
for (k = 0; k < split; k++) {
|
||
|
|
*dst[i]++ = get_value_cached(gb, vals[i], vec[i],
|
||
|
|
vec_len[i], i, val_shift,
|
||
|
|
prev_pix);
|
||
|
|
prev_mode[k] = MKVAL(vals);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (split != 16) {
|
||
|
|
vals[0] = prev_vec1 & 7;
|
||
|
|
vals[1] = (prev_vec1 >> 3) & 7;
|
||
|
|
vals[2] = prev_vec1 >> 6;
|
||
|
|
if (get_bits1(gb)) {
|
||
|
|
read_vec_pos(gb, vals, sel_flag, sel_len, vals);
|
||
|
|
prev_vec1 = MKVAL(vals);
|
||
|
|
}
|
||
|
|
for (i = 0; i < 3; i++) {
|
||
|
|
for (k = 0; k < 16 - split; k++) {
|
||
|
|
*dst[i]++ = get_value_cached(gb, vals[i], vec[i],
|
||
|
|
vec_len[i], i, val_shift,
|
||
|
|
prev_pix);
|
||
|
|
prev_mode[split + k] = MKVAL(vals);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < 3; i++)
|
||
|
|
for (j = 0; j < 16; j++)
|
||
|
|
memcpy(picdst[i] + mb_x * 16 + j * ctx->pic->linesize[i],
|
||
|
|
ctx->imgbuf[i] + j * 16, 16);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void mss4_update_dc_cache(MSS4Context *c, int mb_x)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
c->dc_cache[0][TOP] = c->prev_dc[0][mb_x * 2 + 1];
|
||
|
|
c->dc_cache[0][LEFT] = 0;
|
||
|
|
c->dc_cache[1][TOP] = 0;
|
||
|
|
c->dc_cache[1][LEFT] = 0;
|
||
|
|
|
||
|
|
for (i = 0; i < 2; i++)
|
||
|
|
c->prev_dc[0][mb_x * 2 + i] = 0;
|
||
|
|
|
||
|
|
for (i = 1; i < 3; i++) {
|
||
|
|
c->dc_cache[i + 1][TOP] = c->prev_dc[i][mb_x];
|
||
|
|
c->dc_cache[i + 1][LEFT] = 0;
|
||
|
|
c->prev_dc[i][mb_x] = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int mss4_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
|
||
|
|
AVPacket *avpkt)
|
||
|
|
{
|
||
|
|
const uint8_t *buf = avpkt->data;
|
||
|
|
int buf_size = avpkt->size;
|
||
|
|
MSS4Context *c = avctx->priv_data;
|
||
|
|
GetBitContext gb;
|
||
|
|
GetByteContext bc;
|
||
|
|
uint8_t *dst[3];
|
||
|
|
int width, height, quality, frame_type;
|
||
|
|
int x, y, i, mb_width, mb_height, blk_type;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (buf_size < HEADER_SIZE) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR,
|
||
|
|
"Frame should have at least %d bytes, got %d instead\n",
|
||
|
|
HEADER_SIZE, buf_size);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
bytestream2_init(&bc, buf, buf_size);
|
||
|
|
width = bytestream2_get_be16(&bc);
|
||
|
|
height = bytestream2_get_be16(&bc);
|
||
|
|
bytestream2_skip(&bc, 2);
|
||
|
|
quality = bytestream2_get_byte(&bc);
|
||
|
|
frame_type = bytestream2_get_byte(&bc);
|
||
|
|
|
||
|
|
if (width > avctx->width ||
|
||
|
|
height != avctx->height) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d\n",
|
||
|
|
width, height);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
if (quality < 1 || quality > 100) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid quality setting %d\n", quality);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
if ((frame_type & ~3) || frame_type == 3) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid frame type %d\n", frame_type);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (frame_type != SKIP_FRAME && !bytestream2_get_bytes_left(&bc)) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR,
|
||
|
|
"Empty frame found but it is not a skip frame.\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
|
||
|
|
return ret;
|
||
|
|
c->pic->key_frame = (frame_type == INTRA_FRAME);
|
||
|
|
c->pic->pict_type = (frame_type == INTRA_FRAME) ? AV_PICTURE_TYPE_I
|
||
|
|
: AV_PICTURE_TYPE_P;
|
||
|
|
if (frame_type == SKIP_FRAME) {
|
||
|
|
*got_frame = 1;
|
||
|
|
if ((ret = av_frame_ref(data, c->pic)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
return buf_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (c->quality != quality) {
|
||
|
|
c->quality = quality;
|
||
|
|
for (i = 0; i < 2; i++)
|
||
|
|
ff_mss34_gen_quant_mat(c->quant_mat[i], quality, !i);
|
||
|
|
}
|
||
|
|
|
||
|
|
init_get_bits8(&gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE));
|
||
|
|
|
||
|
|
mb_width = FFALIGN(width, 16) >> 4;
|
||
|
|
mb_height = FFALIGN(height, 16) >> 4;
|
||
|
|
dst[0] = c->pic->data[0];
|
||
|
|
dst[1] = c->pic->data[1];
|
||
|
|
dst[2] = c->pic->data[2];
|
||
|
|
|
||
|
|
memset(c->prev_vec, 0, sizeof(c->prev_vec));
|
||
|
|
for (y = 0; y < mb_height; y++) {
|
||
|
|
memset(c->dc_cache, 0, sizeof(c->dc_cache));
|
||
|
|
for (x = 0; x < mb_width; x++) {
|
||
|
|
blk_type = decode012(&gb);
|
||
|
|
switch (blk_type) {
|
||
|
|
case DCT_BLOCK:
|
||
|
|
if (mss4_decode_dct_block(c, &gb, dst, x, y) < 0) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR,
|
||
|
|
"Error decoding DCT block %d,%d\n",
|
||
|
|
x, y);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case IMAGE_BLOCK:
|
||
|
|
if (mss4_decode_image_block(c, &gb, dst, x, y) < 0) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR,
|
||
|
|
"Error decoding VQ block %d,%d\n",
|
||
|
|
x, y);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case SKIP_BLOCK:
|
||
|
|
if (frame_type == INTRA_FRAME) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Skip block in intra frame\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (blk_type != DCT_BLOCK)
|
||
|
|
mss4_update_dc_cache(c, x);
|
||
|
|
}
|
||
|
|
dst[0] += c->pic->linesize[0] * 16;
|
||
|
|
dst[1] += c->pic->linesize[1] * 16;
|
||
|
|
dst[2] += c->pic->linesize[2] * 16;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((ret = av_frame_ref(data, c->pic)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
*got_frame = 1;
|
||
|
|
|
||
|
|
return buf_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold int mss4_decode_init(AVCodecContext *avctx)
|
||
|
|
{
|
||
|
|
MSS4Context * const c = avctx->priv_data;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
c->pic = av_frame_alloc();
|
||
|
|
if (!c->pic)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
|
||
|
|
if (mss4_init_vlcs(c)) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
|
||
|
|
mss4_free_vlcs(c);
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
for (i = 0; i < 3; i++) {
|
||
|
|
c->dc_stride[i] = FFALIGN(avctx->width, 16) >> (2 + !!i);
|
||
|
|
c->prev_dc[i] = av_malloc(sizeof(**c->prev_dc) * c->dc_stride[i]);
|
||
|
|
if (!c->prev_dc[i]) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot allocate buffer\n");
|
||
|
|
mss4_free_vlcs(c);
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold int mss4_decode_end(AVCodecContext *avctx)
|
||
|
|
{
|
||
|
|
MSS4Context * const c = avctx->priv_data;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
av_frame_free(&c->pic);
|
||
|
|
|
||
|
|
for (i = 0; i < 3; i++)
|
||
|
|
av_freep(&c->prev_dc[i]);
|
||
|
|
mss4_free_vlcs(c);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVCodec ff_mts2_decoder = {
|
||
|
|
.name = "mts2",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("MS Expression Encoder Screen"),
|
||
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
|
.id = AV_CODEC_ID_MTS2,
|
||
|
|
.priv_data_size = sizeof(MSS4Context),
|
||
|
|
.init = mss4_decode_init,
|
||
|
|
.close = mss4_decode_end,
|
||
|
|
.decode = mss4_decode_frame,
|
||
|
|
.capabilities = CODEC_CAP_DR1,
|
||
|
|
};
|