mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
MS ATC Screen (aka MSS3) decoder
This commit is contained in:
Kostya Shishkov
parent
a87b17f328
commit
edf35d8342
@ -30,6 +30,7 @@ version <next>:
|
||||
- Microsoft Screen 1 decoder
|
||||
- join audio filter
|
||||
- audio channel mapping filter
|
||||
- Microsoft ATC Screen decoder
|
||||
|
||||
|
||||
version 0.8:
|
||||
|
||||
@ -531,6 +531,8 @@ following image formats are supported:
|
||||
@item LCL (LossLess Codec Library) ZLIB @tab E @tab E
|
||||
@item LOCO @tab @tab X
|
||||
@item lossless MJPEG @tab X @tab X
|
||||
@item Microsoft ATC Screen @tab @tab X
|
||||
@tab Also known as Microsoft Screen 3.
|
||||
@item Microsoft RLE @tab @tab X
|
||||
@item Microsoft Screen 1 @tab @tab X
|
||||
@tab Also known as Windows Media Video V7 Screen.
|
||||
|
||||
@ -292,6 +292,7 @@ OBJS-$(CONFIG_MSMPEG4V3_ENCODER) += msmpeg4.o msmpeg4enc.o msmpeg4data.o \
|
||||
h263dec.o h263.o ituh263dec.o \
|
||||
mpeg4videodec.o
|
||||
OBJS-$(CONFIG_MSRLE_DECODER) += msrle.o msrledec.o
|
||||
OBJS-$(CONFIG_MSA1_DECODER) += mss3.o
|
||||
OBJS-$(CONFIG_MSS1_DECODER) += mss1.o
|
||||
OBJS-$(CONFIG_MSVIDEO1_DECODER) += msvideo1.o
|
||||
OBJS-$(CONFIG_MSZH_DECODER) += lcldec.o
|
||||
|
||||
@ -152,6 +152,7 @@ void avcodec_register_all(void)
|
||||
REGISTER_DECODER (MPEG4_VDPAU, mpeg4_vdpau);
|
||||
REGISTER_DECODER (MPEG_VDPAU, mpeg_vdpau);
|
||||
REGISTER_DECODER (MPEG1_VDPAU, mpeg1_vdpau);
|
||||
REGISTER_DECODER (MSA1, msa1);
|
||||
REGISTER_DECODER (MSMPEG4V1, msmpeg4v1);
|
||||
REGISTER_ENCDEC (MSMPEG4V2, msmpeg4v2);
|
||||
REGISTER_ENCDEC (MSMPEG4V3, msmpeg4v3);
|
||||
|
||||
@ -256,6 +256,7 @@ enum CodecID {
|
||||
CODEC_ID_XBM,
|
||||
CODEC_ID_ZEROCODEC,
|
||||
CODEC_ID_MSS1,
|
||||
CODEC_ID_MSA1,
|
||||
|
||||
/* various PCM "codecs" */
|
||||
CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
|
||||
|
||||
967
libavcodec/mss3.c
Normal file
967
libavcodec/mss3.c
Normal file
@ -0,0 +1,967 @@
|
||||
/*
|
||||
* Microsoft Screen 3 (aka Microsoft ATC Screen) decoder
|
||||
* Copyright (c) 2012 Konstantin Shishkov
|
||||
*
|
||||
* This file is part of Libav.
|
||||
*
|
||||
* Libav 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.
|
||||
*
|
||||
* Libav 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 Libav; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
|
||||
/**
|
||||
* @file
|
||||
* Microsoft Screen 3 (aka Microsoft ATC Screen) decoder
|
||||
*/
|
||||
|
||||
#include "avcodec.h"
|
||||
#include "bytestream.h"
|
||||
|
||||
#define HEADER_SIZE 27
|
||||
|
||||
#define MODEL2_SCALE 13
|
||||
#define MODEL_SCALE 15
|
||||
#define MODEL256_SEC_SCALE 9
|
||||
|
||||
typedef struct Model2 {
|
||||
int upd_val, till_rescale;
|
||||
unsigned zero_freq, zero_weight;
|
||||
unsigned total_freq, total_weight;
|
||||
} Model2;
|
||||
|
||||
typedef struct Model {
|
||||
int weights[16], freqs[16];
|
||||
int num_syms;
|
||||
int tot_weight;
|
||||
int upd_val, max_upd_val, till_rescale;
|
||||
} Model;
|
||||
|
||||
typedef struct Model256 {
|
||||
int weights[256], freqs[256];
|
||||
int tot_weight;
|
||||
int secondary[68];
|
||||
int sec_size;
|
||||
int upd_val, max_upd_val, till_rescale;
|
||||
} Model256;
|
||||
|
||||
#define RAC_BOTTOM 0x01000000
|
||||
typedef struct RangeCoder {
|
||||
const uint8_t *src, *src_end;
|
||||
|
||||
uint32_t range, low;
|
||||
int got_error;
|
||||
} RangeCoder;
|
||||
|
||||
enum BlockType {
|
||||
FILL_BLOCK = 0,
|
||||
IMAGE_BLOCK,
|
||||
DCT_BLOCK,
|
||||
HAAR_BLOCK,
|
||||
SKIP_BLOCK
|
||||
};
|
||||
|
||||
typedef struct BlockTypeContext {
|
||||
int last_type;
|
||||
Model bt_model[5];
|
||||
} BlockTypeContext;
|
||||
|
||||
typedef struct FillBlockCoder {
|
||||
int fill_val;
|
||||
Model coef_model;
|
||||
} FillBlockCoder;
|
||||
|
||||
typedef struct ImageBlockCoder {
|
||||
Model256 esc_model, vec_entry_model;
|
||||
Model vec_size_model;
|
||||
Model vq_model[125];
|
||||
} ImageBlockCoder;
|
||||
|
||||
typedef struct DCTBlockCoder {
|
||||
int *prev_dc;
|
||||
int prev_dc_stride;
|
||||
int prev_dc_height;
|
||||
int quality;
|
||||
uint16_t qmat[64];
|
||||
Model dc_model;
|
||||
Model2 sign_model;
|
||||
Model256 ac_model;
|
||||
} DCTBlockCoder;
|
||||
|
||||
typedef struct HaarBlockCoder {
|
||||
int quality, scale;
|
||||
Model256 coef_model;
|
||||
Model coef_hi_model;
|
||||
} HaarBlockCoder;
|
||||
|
||||
typedef struct MSS3Context {
|
||||
AVCodecContext *avctx;
|
||||
AVFrame pic;
|
||||
|
||||
int got_error;
|
||||
RangeCoder coder;
|
||||
BlockTypeContext btype[3];
|
||||
FillBlockCoder fill_coder[3];
|
||||
ImageBlockCoder image_coder[3];
|
||||
DCTBlockCoder dct_coder[3];
|
||||
HaarBlockCoder haar_coder[3];
|
||||
|
||||
int dctblock[64];
|
||||
int hblock[16 * 16];
|
||||
} MSS3Context;
|
||||
|
||||
static const uint8_t mss3_luma_quant[64] = {
|
||||
16, 11, 10, 16, 24, 40, 51, 61,
|
||||
12, 12, 14, 19, 26, 58, 60, 55,
|
||||
14, 13, 16, 24, 40, 57, 69, 56,
|
||||
14, 17, 22, 29, 51, 87, 80, 62,
|
||||
18, 22, 37, 56, 68, 109, 103, 77,
|
||||
24, 35, 55, 64, 81, 104, 113, 92,
|
||||
49, 64, 78, 87, 103, 121, 120, 101,
|
||||
72, 92, 95, 98, 112, 100, 103, 99
|
||||
};
|
||||
|
||||
static const uint8_t mss3_chroma_quant[64] = {
|
||||
17, 18, 24, 47, 99, 99, 99, 99,
|
||||
18, 21, 26, 66, 99, 99, 99, 99,
|
||||
24, 26, 56, 99, 99, 99, 99, 99,
|
||||
47, 66, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99,
|
||||
99, 99, 99, 99, 99, 99, 99, 99
|
||||
};
|
||||
|
||||
const uint8_t zigzag_scan[64] = {
|
||||
0, 1, 8, 16, 9, 2, 3, 10,
|
||||
17, 24, 32, 25, 18, 11, 4, 5,
|
||||
12, 19, 26, 33, 40, 48, 41, 34,
|
||||
27, 20, 13, 6, 7, 14, 21, 28,
|
||||
35, 42, 49, 56, 57, 50, 43, 36,
|
||||
29, 22, 15, 23, 30, 37, 44, 51,
|
||||
58, 59, 52, 45, 38, 31, 39, 46,
|
||||
53, 60, 61, 54, 47, 55, 62, 63
|
||||
};
|
||||
|
||||
|
||||
static void model2_reset(Model2 *m)
|
||||
{
|
||||
m->zero_weight = 1;
|
||||
m->total_weight = 2;
|
||||
m->zero_freq = 0x1000;
|
||||
m->total_freq = 0x2000;
|
||||
m->upd_val = 4;
|
||||
m->till_rescale = 4;
|
||||
}
|
||||
|
||||
static void model2_update(Model2 *m, int bit)
|
||||
{
|
||||
unsigned scale;
|
||||
|
||||
if (!bit)
|
||||
m->zero_weight++;
|
||||
m->till_rescale--;
|
||||
if (m->till_rescale)
|
||||
return;
|
||||
|
||||
m->total_weight += m->upd_val;
|
||||
if (m->total_weight > 0x2000) {
|
||||
m->total_weight = (m->total_weight + 1) >> 1;
|
||||
m->zero_weight = (m->zero_weight + 1) >> 1;
|
||||
if (m->total_weight == m->zero_weight)
|
||||
m->total_weight = m->zero_weight + 1;
|
||||
}
|
||||
m->upd_val = m->upd_val * 5 >> 2;
|
||||
if (m->upd_val > 64)
|
||||
m->upd_val = 64;
|
||||
scale = 0x80000000u / m->total_weight;
|
||||
m->zero_freq = m->zero_weight * scale >> 18;
|
||||
m->total_freq = m->total_weight * scale >> 18;
|
||||
m->till_rescale = m->upd_val;
|
||||
}
|
||||
|
||||
static void model_update(Model *m, int val)
|
||||
{
|
||||
int i, sum = 0;
|
||||
unsigned scale;
|
||||
|
||||
m->weights[val]++;
|
||||
m->till_rescale--;
|
||||
if (m->till_rescale)
|
||||
return;
|
||||
m->tot_weight += m->upd_val;
|
||||
|
||||
if (m->tot_weight > 0x8000) {
|
||||
m->tot_weight = 0;
|
||||
for (i = 0; i < m->num_syms; i++) {
|
||||
m->weights[i] = (m->weights[i] + 1) >> 1;
|
||||
m->tot_weight += m->weights[i];
|
||||
}
|
||||
}
|
||||
scale = 0x80000000u / m->tot_weight;
|
||||
for (i = 0; i < m->num_syms; i++) {
|
||||
m->freqs[i] = sum * scale >> 16;
|
||||
sum += m->weights[i];
|
||||
}
|
||||
|
||||
m->upd_val = m->upd_val * 5 >> 2;
|
||||
if (m->upd_val > m->max_upd_val)
|
||||
m->upd_val = m->max_upd_val;
|
||||
m->till_rescale = m->upd_val;
|
||||
}
|
||||
|
||||
static void model_reset(Model *m)
|
||||
{
|
||||
int i;
|
||||
|
||||
m->tot_weight = 0;
|
||||
for (i = 0; i < m->num_syms - 1; i++)
|
||||
m->weights[i] = 1;
|
||||
m->weights[m->num_syms - 1] = 0;
|
||||
|
||||
m->upd_val = m->num_syms;
|
||||
m->till_rescale = 1;
|
||||
model_update(m, m->num_syms - 1);
|
||||
m->till_rescale =
|
||||
m->upd_val = (m->num_syms + 6) >> 1;
|
||||
}
|
||||
|
||||
static av_cold void model_init(Model *m, int num_syms)
|
||||
{
|
||||
m->num_syms = num_syms;
|
||||
m->max_upd_val = 8 * num_syms + 48;
|
||||
|
||||
model_reset(m);
|
||||
}
|
||||
|
||||
static void model256_update(Model256 *m, int val)
|
||||
{
|
||||
int i, sum = 0;
|
||||
unsigned scale;
|
||||
int send, sidx = 1;
|
||||
|
||||
m->weights[val]++;
|
||||
m->till_rescale--;
|
||||
if (m->till_rescale)
|
||||
return;
|
||||
m->tot_weight += m->upd_val;
|
||||
|
||||
if (m->tot_weight > 0x8000) {
|
||||
m->tot_weight = 0;
|
||||
for (i = 0; i < 256; i++) {
|
||||
m->weights[i] = (m->weights[i] + 1) >> 1;
|
||||
m->tot_weight += m->weights[i];
|
||||
}
|
||||
}
|
||||
scale = 0x80000000u / m->tot_weight;
|
||||
m->secondary[0] = 0;
|
||||
for (i = 0; i < 256; i++) {
|
||||
m->freqs[i] = sum * scale >> 16;
|
||||
sum += m->weights[i];
|
||||
send = m->freqs[i] >> MODEL256_SEC_SCALE;
|
||||
while (sidx <= send)
|
||||
m->secondary[sidx++] = i - 1;
|
||||
}
|
||||
while (sidx < m->sec_size)
|
||||
m->secondary[sidx++] = 255;
|
||||
|
||||
m->upd_val = m->upd_val * 5 >> 2;
|
||||
if (m->upd_val > m->max_upd_val)
|
||||
m->upd_val = m->max_upd_val;
|
||||
m->till_rescale = m->upd_val;
|
||||
}
|
||||
|
||||
static void model256_reset(Model256 *m)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 255; i++)
|
||||
m->weights[i] = 1;
|
||||
m->weights[255] = 0;
|
||||
|
||||
m->tot_weight = 0;
|
||||
m->upd_val = 256;
|
||||
m->till_rescale = 1;
|
||||
model256_update(m, 255);
|
||||
m->till_rescale =
|
||||
m->upd_val = (256 + 6) >> 1;
|
||||
}
|
||||
|
||||
static av_cold void model256_init(Model256 *m)
|
||||
{
|
||||
m->max_upd_val = 8 * 256 + 48;
|
||||
m->sec_size = (1 << 6) + 2;
|
||||
|
||||
model256_reset(m);
|
||||
}
|
||||
|
||||
static void rac_init(RangeCoder *c, const uint8_t *src, int size)
|
||||
{
|
||||
int i;
|
||||
|
||||
c->src = src;
|
||||
c->src_end = src + size;
|
||||
c->low = 0;
|
||||
for (i = 0; i < FFMIN(size, 4); i++)
|
||||
c->low = (c->low << 8) | *c->src++;
|
||||
c->range = 0xFFFFFFFF;
|
||||
c->got_error = 0;
|
||||
}
|
||||
|
||||
static void rac_normalise(RangeCoder *c)
|
||||
{
|
||||
for (;;) {
|
||||
c->range <<= 8;
|
||||
c->low <<= 8;
|
||||
if (c->src < c->src_end) {
|
||||
c->low |= *c->src++;
|
||||
} else if (!c->low) {
|
||||
c->got_error = 1;
|
||||
return;
|
||||
}
|
||||
if (c->range >= RAC_BOTTOM)
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
static int rac_get_bit(RangeCoder *c)
|
||||
{
|
||||
int bit;
|
||||
|
||||
c->range >>= 1;
|
||||
|
||||
bit = (c->range <= c->low);
|
||||
if (bit)
|
||||
c->low -= c->range;
|
||||
|
||||
if (c->range < RAC_BOTTOM)
|
||||
rac_normalise(c);
|
||||
|
||||
return bit;
|
||||
}
|
||||
|
||||
static int rac_get_bits(RangeCoder *c, int nbits)
|
||||
{
|
||||
int val;
|
||||
|
||||
c->range >>= nbits;
|
||||
val = c->low / c->range;
|
||||
c->low -= c->range * val;
|
||||
|
||||
if (c->range < RAC_BOTTOM)
|
||||
rac_normalise(c);
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static int rac_get_model2_sym(RangeCoder *c, Model2 *m)
|
||||
{
|
||||
int bit, helper;
|
||||
|
||||
helper = m->zero_freq * (c->range >> MODEL2_SCALE);
|
||||
bit = (c->low >= helper);
|
||||
if (bit) {
|
||||
c->low -= helper;
|
||||
c->range -= helper;
|
||||
} else {
|
||||
c->range = helper;
|
||||
}
|
||||
|
||||
if (c->range < RAC_BOTTOM)
|
||||
rac_normalise(c);
|
||||
|
||||
model2_update(m, bit);
|
||||
|
||||
return bit;
|
||||
}
|
||||
|
||||
static int rac_get_model_sym(RangeCoder *c, Model *m)
|
||||
{
|
||||
int prob, prob2, helper, val;
|
||||
int end, end2;
|
||||
|
||||
prob = 0;
|
||||
prob2 = c->range;
|
||||
c->range >>= MODEL_SCALE;
|
||||
val = 0;
|
||||
end = m->num_syms >> 1;
|
||||
end2 = m->num_syms;
|
||||
do {
|
||||
helper = m->freqs[end] * c->range;
|
||||
if (helper <= c->low) {
|
||||
val = end;
|
||||
prob = helper;
|
||||
} else {
|
||||
end2 = end;
|
||||
prob2 = helper;
|
||||
}
|
||||
end = (end2 + val) >> 1;
|
||||
} while (end != val);
|
||||
c->low -= prob;
|
||||
c->range = prob2 - prob;
|
||||
if (c->range < RAC_BOTTOM)
|
||||
rac_normalise(c);
|
||||
|
||||
model_update(m, val);
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static int rac_get_model256_sym(RangeCoder *c, Model256 *m)
|
||||
{
|
||||
int prob, prob2, helper, val;
|
||||
int start, end;
|
||||
int ssym;
|
||||
|
||||
prob2 = c->range;
|
||||
c->range >>= MODEL_SCALE;
|
||||
|
||||
helper = c->low / c->range;
|
||||
ssym = helper >> MODEL256_SEC_SCALE;
|
||||
val = m->secondary[ssym];
|
||||
|
||||
end = start = m->secondary[ssym + 1] + 1;
|
||||
while (end > val + 1) {
|
||||
ssym = (end + val) >> 1;
|
||||
if (m->freqs[ssym] <= helper) {
|
||||
end = start;
|
||||
val = ssym;
|
||||
} else {
|
||||
end = (end + val) >> 1;
|
||||
start = ssym;
|
||||
}
|
||||
}
|
||||
prob = m->freqs[val] * c->range;
|
||||
if (val != 255)
|
||||
prob2 = m->freqs[val + 1] * c->range;
|
||||
|
||||
c->low -= prob;
|
||||
c->range = prob2 - prob;
|
||||
if (c->range < RAC_BOTTOM)
|
||||
rac_normalise(c);
|
||||
|
||||
model256_update(m, val);
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static int decode_block_type(RangeCoder *c, BlockTypeContext *bt)
|
||||
{
|
||||
bt->last_type = rac_get_model_sym(c, &bt->bt_model[bt->last_type]);
|
||||
|
||||
return bt->last_type;
|
||||
}
|
||||
|
||||
static int decode_coeff(RangeCoder *c, Model *m)
|
||||
{
|
||||
int val, sign;
|
||||
|
||||
val = rac_get_model_sym(c, m);
|
||||
if (val) {
|
||||
sign = rac_get_bit(c);
|
||||
if (val > 1) {
|
||||
val--;
|
||||
val = (1 << val) + rac_get_bits(c, val);
|
||||
}
|
||||
if (!sign)
|
||||
val = -val;
|
||||
}
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static void decode_fill_block(RangeCoder *c, FillBlockCoder *fc,
|
||||
uint8_t *dst, int stride, int block_size)
|
||||
{
|
||||
int i;
|
||||
|
||||
fc->fill_val += decode_coeff(c, &fc->coef_model);
|
||||
|
||||
for (i = 0; i < block_size; i++, dst += stride)
|
||||
memset(dst, fc->fill_val, block_size);
|
||||
}
|
||||
|
||||
static void decode_image_block(RangeCoder *c, ImageBlockCoder *ic,
|
||||
uint8_t *dst, int stride, int block_size)
|
||||
{
|
||||
int i, j;
|
||||
int vec_size;
|
||||
int vec[4];
|
||||
int prev_line[16];
|
||||
int A, B, C;
|
||||
|
||||
vec_size = rac_get_model_sym(c, &ic->vec_size_model) + 2;
|
||||
for (i = 0; i < vec_size; i++)
|
||||
vec[i] = rac_get_model256_sym(c, &ic->vec_entry_model);
|
||||
for (; i < 4; i++)
|
||||
vec[i] = 0;
|
||||
memset(prev_line, 0, sizeof(prev_line));
|
||||
|
||||
for (j = 0; j < block_size; j++) {
|
||||
A = 0;
|
||||
B = 0;
|
||||
for (i = 0; i < block_size; i++) {
|
||||
C = B;
|
||||
B = prev_line[i];
|
||||
A = rac_get_model_sym(c, &ic->vq_model[A + B * 5 + C * 25]);
|
||||
|
||||
prev_line[i] = A;
|
||||
if (A < 4)
|
||||
dst[i] = vec[A];
|
||||
else
|
||||
dst[i] = rac_get_model256_sym(c, &ic->esc_model);
|
||||
}
|
||||
dst += stride;
|
||||
}
|
||||
}
|
||||
|
||||
static int decode_dct(RangeCoder *c, DCTBlockCoder *bc, int *block,
|
||||
int bx, int by)
|
||||
{
|
||||
int skip, val, sign, pos = 1, zz_pos, dc;
|
||||
int blk_pos = bx + by * bc->prev_dc_stride;
|
||||
|
||||
memset(block, 0, sizeof(*block) * 64);
|
||||
|
||||
dc = decode_coeff(c, &bc->dc_model);
|
||||
if (by) {
|
||||
if (bx) {
|
||||
int l, tl, t;
|
||||
|
||||
l = bc->prev_dc[blk_pos - 1];
|
||||
tl = bc->prev_dc[blk_pos - 1 - bc->prev_dc_stride];
|
||||
t = bc->prev_dc[blk_pos - bc->prev_dc_stride];
|
||||
|
||||
if (FFABS(t - tl) <= FFABS(l - tl))
|
||||
dc += l;
|
||||
else
|
||||
dc += t;
|
||||
} else {
|
||||
dc += bc->prev_dc[blk_pos - bc->prev_dc_stride];
|
||||
}
|
||||
} else if (bx) {
|
||||
dc += bc->prev_dc[bx - 1];
|
||||
}
|
||||
bc->prev_dc[blk_pos] = dc;
|
||||
block[0] = dc * bc->qmat[0];
|
||||
|
||||
while (pos < 64) {
|
||||
val = rac_get_model256_sym(c, &bc->ac_model);
|
||||
if (!val)
|
||||
return 0;
|
||||
if (val == 0xF0) {
|
||||
pos += 16;
|
||||
continue;
|
||||
}
|
||||
skip = val >> 4;
|
||||
val = val & 0xF;
|
||||
if (!val)
|
||||
return -1;
|
||||
pos += skip;
|
||||
if (pos >= 64)
|
||||
return -1;
|
||||
|
||||
sign = rac_get_model2_sym(c, &bc->sign_model);
|
||||
if (val > 1) {
|
||||
val--;
|
||||
val = (1 << val) + rac_get_bits(c, val);
|
||||
}
|
||||
if (!sign)
|
||||
val = -val;
|
||||
|
||||
zz_pos = zigzag_scan[pos];
|
||||
block[zz_pos] = val * bc->qmat[zz_pos];
|
||||
pos++;
|
||||
}
|
||||
|
||||
return pos == 64 ? 0 : -1;
|
||||
}
|
||||
|
||||
#define DCT_TEMPLATE(blk, step, SOP, shift) \
|
||||
const int t0 = -39409 * blk[7 * step] - 58980 * blk[1 * step]; \
|
||||
const int t1 = 39410 * blk[1 * step] - 58980 * blk[7 * step]; \
|
||||
const int t2 = -33410 * blk[5 * step] - 167963 * blk[3 * step]; \
|
||||
const int t3 = 33410 * blk[3 * step] - 167963 * blk[5 * step]; \
|
||||
const int t4 = blk[3 * step] + blk[7 * step]; \
|
||||
const int t5 = blk[1 * step] + blk[5 * step]; \
|
||||
const int t6 = 77062 * t4 + 51491 * t5; \
|
||||
const int t7 = 77062 * t5 - 51491 * t4; \
|
||||
const int t8 = 35470 * blk[2 * step] - 85623 * blk[6 * step]; \
|
||||
const int t9 = 35470 * blk[6 * step] + 85623 * blk[2 * step]; \
|
||||
const int tA = SOP(blk[0 * step] - blk[4 * step]); \
|
||||
const int tB = SOP(blk[0 * step] + blk[4 * step]); \
|
||||
\
|
||||
blk[0 * step] = ( t1 + t6 + t9 + tB) >> shift; \
|
||||
blk[1 * step] = ( t3 + t7 + t8 + tA) >> shift; \
|
||||
blk[2 * step] = ( t2 + t6 - t8 + tA) >> shift; \
|
||||
blk[3 * step] = ( t0 + t7 - t9 + tB) >> shift; \
|
||||
blk[4 * step] = (-(t0 + t7) - t9 + tB) >> shift; \
|
||||
blk[5 * step] = (-(t2 + t6) - t8 + tA) >> shift; \
|
||||
blk[6 * step] = (-(t3 + t7) + t8 + tA) >> shift; \
|
||||
blk[7 * step] = (-(t1 + t6) + t9 + tB) >> shift; \
|
||||
|
||||
#define SOP_ROW(a) ((a) << 16) + 0x2000
|
||||
#define SOP_COL(a) ((a + 32) << 16)
|
||||
|
||||
static void dct_put(uint8_t *dst, int stride, int *block)
|
||||
{
|
||||
int i, j;
|
||||
int *ptr;
|
||||
|
||||
ptr = block;
|
||||
for (i = 0; i < 8; i++) {
|
||||
DCT_TEMPLATE(ptr, 1, SOP_ROW, 13);
|
||||
ptr += 8;
|
||||
}
|
||||
|
||||
ptr = block;
|
||||
for (i = 0; i < 8; i++) {
|
||||
DCT_TEMPLATE(ptr, 8, SOP_COL, 22);
|
||||
ptr++;
|
||||
}
|
||||
|
||||
ptr = block;
|
||||
for (j = 0; j < 8; j++) {
|
||||
for (i = 0; i < 8; i++)
|
||||
dst[i] = av_clip_uint8(ptr[i] + 128);
|
||||
dst += stride;
|
||||
ptr += 8;
|
||||
}
|
||||
}
|
||||
|
||||
static void decode_dct_block(RangeCoder *c, DCTBlockCoder *bc,
|
||||
uint8_t *dst, int stride, int block_size,
|
||||
int *block, int mb_x, int mb_y)
|
||||
{
|
||||
int i, j;
|
||||
int bx, by;
|
||||
int nblocks = block_size >> 3;
|
||||
|
||||
bx = mb_x * nblocks;
|
||||
by = mb_y * nblocks;
|
||||
|
||||
for (j = 0; j < nblocks; j++) {
|
||||
for (i = 0; i < nblocks; i++) {
|
||||
if (decode_dct(c, bc, block, bx + i, by + j)) {
|
||||
c->got_error = 1;
|
||||
return;
|
||||
}
|
||||
dct_put(dst + i * 8, stride, block);
|
||||
}
|
||||
dst += 8 * stride;
|
||||
}
|
||||
}
|
||||
|
||||
static void decode_haar_block(RangeCoder *c, HaarBlockCoder *hc,
|
||||
uint8_t *dst, int stride, int block_size,
|
||||
int *block)
|
||||
{
|
||||
const int hsize = block_size >> 1;
|
||||
int A, B, C, D, t1, t2, t3, t4;
|
||||
int i, j;
|
||||
|
||||
for (j = 0; j < block_size; j++) {
|
||||
for (i = 0; i < block_size; i++) {
|
||||
if (i < hsize && j < hsize)
|
||||
block[i] = rac_get_model256_sym(c, &hc->coef_model);
|
||||
else
|
||||
block[i] = decode_coeff(c, &hc->coef_hi_model);
|
||||
block[i] *= hc->scale;
|
||||
}
|
||||
block += block_size;
|
||||
}
|
||||
block -= block_size * block_size;
|
||||
|
||||
for (j = 0; j < hsize; j++) {
|
||||
for (i = 0; i < hsize; i++) {
|
||||
A = block[i];
|
||||
B = block[i + hsize];
|
||||
C = block[i + hsize * block_size];
|
||||
D = block[i + hsize * block_size + hsize];
|
||||
|
||||
t1 = A - B;
|
||||
t2 = C - D;
|
||||
t3 = A + B;
|
||||
t4 = C + D;
|
||||
dst[i * 2] = av_clip_uint8(t1 - t2);
|
||||
dst[i * 2 + stride] = av_clip_uint8(t1 + t2);
|
||||
dst[i * 2 + 1] = av_clip_uint8(t3 - t4);
|
||||
dst[i * 2 + 1 + stride] = av_clip_uint8(t3 + t4);
|
||||
}
|
||||
block += block_size;
|
||||
dst += stride * 2;
|
||||
}
|
||||
}
|
||||
|
||||
static void gen_quant_mat(uint16_t *qmat, const uint8_t *ref, float scale)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 64; i++)
|
||||
qmat[i] = (uint16_t)(ref[i] * scale + 50.0) / 100;
|
||||
}
|
||||
|
||||
static void reset_coders(MSS3Context *ctx, int quality)
|
||||
{
|
||||
int i, j;
|
||||
|
||||
for (i = 0; i < 3; i++) {
|
||||
ctx->btype[i].last_type = SKIP_BLOCK;
|
||||
for (j = 0; j < 5; j++)
|
||||
model_reset(&ctx->btype[i].bt_model[j]);
|
||||
ctx->fill_coder[i].fill_val = 0;
|
||||
model_reset(&ctx->fill_coder[i].coef_model);
|
||||
model256_reset(&ctx->image_coder[i].esc_model);
|
||||
model256_reset(&ctx->image_coder[i].vec_entry_model);
|
||||
model_reset(&ctx->image_coder[i].vec_size_model);
|
||||
for (j = 0; j < 125; j++)
|
||||
model_reset(&ctx->image_coder[i].vq_model[j]);
|
||||
if (ctx->dct_coder[i].quality != quality) {
|
||||
float scale;
|
||||
ctx->dct_coder[i].quality = quality;
|
||||
if (quality > 50)
|
||||
scale = 200.0f - 2 * quality;
|
||||
else
|
||||
scale = 5000.0f / quality;
|
||||
gen_quant_mat(ctx->dct_coder[i].qmat,
|
||||
i ? mss3_chroma_quant : mss3_luma_quant,
|
||||
scale);
|
||||
}
|
||||
memset(ctx->dct_coder[i].prev_dc, 0,
|
||||
sizeof(*ctx->dct_coder[i].prev_dc) *
|
||||
ctx->dct_coder[i].prev_dc_stride *
|
||||
ctx->dct_coder[i].prev_dc_height);
|
||||
model_reset(&ctx->dct_coder[i].dc_model);
|
||||
model2_reset(&ctx->dct_coder[i].sign_model);
|
||||
model256_reset(&ctx->dct_coder[i].ac_model);
|
||||
if (ctx->haar_coder[i].quality != quality) {
|
||||
ctx->haar_coder[i].quality = quality;
|
||||
ctx->haar_coder[i].scale = 17 - 7 * quality / 50;
|
||||
}
|
||||
model_reset(&ctx->haar_coder[i].coef_hi_model);
|
||||
model256_reset(&ctx->haar_coder[i].coef_model);
|
||||
}
|
||||
}
|
||||
|
||||
static av_cold void init_coders(MSS3Context *ctx)
|
||||
{
|
||||
int i, j;
|
||||
|
||||
for (i = 0; i < 3; i++) {
|
||||
for (j = 0; j < 5; j++)
|
||||
model_init(&ctx->btype[i].bt_model[j], 5);
|
||||
model_init(&ctx->fill_coder[i].coef_model, 12);
|
||||
model256_init(&ctx->image_coder[i].esc_model);
|
||||
model256_init(&ctx->image_coder[i].vec_entry_model);
|
||||
model_init(&ctx->image_coder[i].vec_size_model, 3);
|
||||
for (j = 0; j < 125; j++)
|
||||
model_init(&ctx->image_coder[i].vq_model[j], 5);
|
||||
model_init(&ctx->dct_coder[i].dc_model, 12);
|
||||
model256_init(&ctx->dct_coder[i].ac_model);
|
||||
model_init(&ctx->haar_coder[i].coef_hi_model, 12);
|
||||
model256_init(&ctx->haar_coder[i].coef_model);
|
||||
}
|
||||
}
|
||||
|
||||
static int mss3_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
|
||||
AVPacket *avpkt)
|
||||
{
|
||||
const uint8_t *buf = avpkt->data;
|
||||
int buf_size = avpkt->size;
|
||||
MSS3Context *c = avctx->priv_data;
|
||||
RangeCoder *acoder = &c->coder;
|
||||
GetByteContext gb;
|
||||
uint8_t *dst[3];
|
||||
int dec_width, dec_height, dec_x, dec_y, quality, keyframe;
|
||||
int x, y, i, mb_width, mb_height, blk_size, btype;
|
||||
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(&gb, buf, buf_size);
|
||||
keyframe = bytestream2_get_be32(&gb);
|
||||
if (keyframe & ~0x301) {
|
||||
av_log(avctx, AV_LOG_ERROR, "Invalid frame type %X\n", keyframe);
|
||||
return AVERROR_INVALIDDATA;
|
||||
}
|
||||
keyframe = !(keyframe & 1);
|
||||
bytestream2_skip(&gb, 6);
|
||||
dec_x = bytestream2_get_be16(&gb);
|
||||
dec_y = bytestream2_get_be16(&gb);
|
||||
dec_width = bytestream2_get_be16(&gb);
|
||||
dec_height = bytestream2_get_be16(&gb);
|
||||
|
||||
if (dec_x + dec_width > avctx->width ||
|
||||
dec_y + dec_height > avctx->height ||
|
||||
(dec_width | dec_height) & 0xF) {
|
||||
av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d +%d,%d\n",
|
||||
dec_width, dec_height, dec_x, dec_y);
|
||||
return AVERROR_INVALIDDATA;
|
||||
}
|
||||
bytestream2_skip(&gb, 4);
|
||||
quality = bytestream2_get_byte(&gb);
|
||||
if (quality < 1 || quality > 100) {
|
||||
av_log(avctx, AV_LOG_ERROR, "Invalid quality setting %d\n", quality);
|
||||
return AVERROR_INVALIDDATA;
|
||||
}
|
||||
bytestream2_skip(&gb, 4);
|
||||
|
||||
if (keyframe && !bytestream2_get_bytes_left(&gb)) {
|
||||
av_log(avctx, AV_LOG_ERROR, "Keyframe without data found\n");
|
||||
return AVERROR_INVALIDDATA;
|
||||
}
|
||||
if (!keyframe && c->got_error)
|
||||
return buf_size;
|
||||
c->got_error = 0;
|
||||
|
||||
c->pic.reference = 3;
|
||||
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
|
||||
FF_BUFFER_HINTS_REUSABLE;
|
||||
if ((ret = avctx->reget_buffer(avctx, &c->pic)) < 0) {
|
||||
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
|
||||
return ret;
|
||||
}
|
||||
c->pic.key_frame = keyframe;
|
||||
c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
|
||||
if (!bytestream2_get_bytes_left(&gb)) {
|
||||
*data_size = sizeof(AVFrame);
|
||||
*(AVFrame*)data = c->pic;
|
||||
|
||||
return buf_size;
|
||||
}
|
||||
|
||||
reset_coders(c, quality);
|
||||
|
||||
rac_init(acoder, buf + HEADER_SIZE, buf_size - HEADER_SIZE);
|
||||
|
||||
mb_width = dec_width >> 4;
|
||||
mb_height = dec_height >> 4;
|
||||
dst[0] = c->pic.data[0] + dec_x + dec_y * c->pic.linesize[0];
|
||||
dst[1] = c->pic.data[1] + dec_x / 2 + (dec_y / 2) * c->pic.linesize[1];
|
||||
dst[2] = c->pic.data[2] + dec_x / 2 + (dec_y / 2) * c->pic.linesize[2];
|
||||
for (y = 0; y < mb_height; y++) {
|
||||
for (x = 0; x < mb_width; x++) {
|
||||
for (i = 0; i < 3; i++) {
|
||||
blk_size = 8 << !i;
|
||||
|
||||
btype = decode_block_type(acoder, c->btype + i);
|
||||
switch (btype) {
|
||||
case FILL_BLOCK:
|
||||
decode_fill_block(acoder, c->fill_coder + i,
|
||||
dst[i] + x * blk_size,
|
||||
c->pic.linesize[i], blk_size);
|
||||
break;
|
||||
case IMAGE_BLOCK:
|
||||
decode_image_block(acoder, c->image_coder + i,
|
||||
dst[i] + x * blk_size,
|
||||
c->pic.linesize[i], blk_size);
|
||||
break;
|
||||
case DCT_BLOCK:
|
||||
decode_dct_block(acoder, c->dct_coder + i,
|
||||
dst[i] + x * blk_size,
|
||||
c->pic.linesize[i], blk_size,
|
||||
c->dctblock, x, y);
|
||||
break;
|
||||
case HAAR_BLOCK:
|
||||
decode_haar_block(acoder, c->haar_coder + i,
|
||||
dst[i] + x * blk_size,
|
||||
c->pic.linesize[i], blk_size,
|
||||
c->hblock);
|
||||
break;
|
||||
}
|
||||
if (c->got_error || acoder->got_error) {
|
||||
av_log(avctx, AV_LOG_ERROR, "Error decoding block %d,%d\n",
|
||||
x, y);
|
||||
c->got_error = 1;
|
||||
return AVERROR_INVALIDDATA;
|
||||
}
|
||||
}
|
||||
}
|
||||
dst[0] += c->pic.linesize[0] * 16;
|
||||
dst[1] += c->pic.linesize[1] * 8;
|
||||
dst[2] += c->pic.linesize[2] * 8;
|
||||
}
|
||||
|
||||
*data_size = sizeof(AVFrame);
|
||||
*(AVFrame*)data = c->pic;
|
||||
|
||||
return buf_size;
|
||||
}
|
||||
|
||||
static av_cold int mss3_decode_init(AVCodecContext *avctx)
|
||||
{
|
||||
MSS3Context * const c = avctx->priv_data;
|
||||
int i;
|
||||
|
||||
c->avctx = avctx;
|
||||
|
||||
if ((avctx->width & 0xF) || (avctx->height & 0xF)) {
|
||||
av_log(avctx, AV_LOG_ERROR,
|
||||
"Image dimensions should be a multiple of 16.\n");
|
||||
return AVERROR_INVALIDDATA;
|
||||
}
|
||||
|
||||
c->got_error = 0;
|
||||
for (i = 0; i < 3; i++) {
|
||||
int b_width = avctx->width >> (2 + !!i);
|
||||
int b_height = avctx->height >> (2 + !!i);
|
||||
c->dct_coder[i].prev_dc_stride = b_width;
|
||||
c->dct_coder[i].prev_dc_height = b_height;
|
||||
c->dct_coder[i].prev_dc = av_malloc(sizeof(*c->dct_coder[i].prev_dc) *
|
||||
b_width * b_height);
|
||||
if (!c->dct_coder[i].prev_dc) {
|
||||
av_log(avctx, AV_LOG_ERROR, "Cannot allocate buffer\n");
|
||||
while (i >= 0) {
|
||||
av_freep(&c->dct_coder[i].prev_dc);
|
||||
i--;
|
||||
}
|
||||
return AVERROR(ENOMEM);
|
||||
}
|
||||
}
|
||||
|
||||
avctx->pix_fmt = PIX_FMT_YUV420P;
|
||||
avctx->coded_frame = &c->pic;
|
||||
|
||||
init_coders(c);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static av_cold int mss3_decode_end(AVCodecContext *avctx)
|
||||
{
|
||||
MSS3Context * const c = avctx->priv_data;
|
||||
int i;
|
||||
|
||||
if (c->pic.data[0])
|
||||
avctx->release_buffer(avctx, &c->pic);
|
||||
for (i = 0; i < 3; i++)
|
||||
av_freep(&c->dct_coder[i].prev_dc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVCodec ff_msa1_decoder = {
|
||||
.name = "msa1",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.id = CODEC_ID_MSA1,
|
||||
.priv_data_size = sizeof(MSS3Context),
|
||||
.init = mss3_decode_init,
|
||||
.close = mss3_decode_end,
|
||||
.decode = mss3_decode_frame,
|
||||
.capabilities = CODEC_CAP_DR1,
|
||||
.long_name = NULL_IF_CONFIG_SMALL("MS ATC Screen"),
|
||||
};
|
||||
@ -27,7 +27,7 @@
|
||||
*/
|
||||
|
||||
#define LIBAVCODEC_VERSION_MAJOR 54
|
||||
#define LIBAVCODEC_VERSION_MINOR 16
|
||||
#define LIBAVCODEC_VERSION_MINOR 17
|
||||
#define LIBAVCODEC_VERSION_MICRO 0
|
||||
|
||||
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
|
||||
|
||||
@ -285,6 +285,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
|
||||
{ CODEC_ID_DXTORY, MKTAG('x', 't', 'o', 'r') },
|
||||
{ CODEC_ID_ZEROCODEC, MKTAG('Z', 'E', 'C', 'O') },
|
||||
{ CODEC_ID_MSS1, MKTAG('M', 'S', 'S', '1') },
|
||||
{ CODEC_ID_MSA1, MKTAG('M', 'S', 'A', '1') },
|
||||
{ CODEC_ID_NONE, 0 }
|
||||
};
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user