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FFmpeg/libavcodec/intrax8.c
Andreas Rheinhardt 4a134eb14a avcodec/intrax8: Fix assert 
Commit 900ce6f8c3 replaced
IntraX8Context.ac_vlc by IntraX8Context.ac_vlc_table,
but forgot to update an av_assert2()*.
cf7ed01938 then
replaced this with a check for j_ac_vlc[mode],
but this makes no sense as j_ac_vlc is of type
const VLCElem [2][2][8][].

Worse yet, mode can be up to three and then
j_ac_vlc[mode] is undefined behaviour. This happened
during the wmv8-x8intra FATE test.

*: Since 84f16bb5e6
config.h was no longer auto-included in avassert.h
and this disabled av_assert1() and av_assert2()
in files where config.h has not been included before
the inclusion of avassert.h.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-02-29 10:30:16 +01:00

805 lines
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/*
* 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
* @brief IntraX8 (J-Frame) subdecoder, used by WMV2 and VC-1
*/
#include "libavutil/avassert.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "msmpeg4_vc1_data.h"
#include "intrax8huf.h"
#include "intrax8.h"
#include "intrax8dsp.h"
#include "mpegutils.h"
#define VLC_BUFFER_SIZE 28150
#define MAX_TABLE_DEPTH(table_bits, max_bits) \
((max_bits + table_bits - 1) / table_bits)
#define DC_VLC_BITS 9
#define AC_VLC_BITS 9
#define OR_VLC_BITS 7
#define DC_VLC_MTD MAX_TABLE_DEPTH(DC_VLC_BITS, MAX_DC_VLC_BITS)
#define AC_VLC_MTD MAX_TABLE_DEPTH(AC_VLC_BITS, MAX_AC_VLC_BITS)
#define OR_VLC_MTD MAX_TABLE_DEPTH(OR_VLC_BITS, MAX_OR_VLC_BITS)
static const VLCElem *j_ac_vlc[2][2][8]; // [quant < 13], [intra / inter], [select]
static const VLCElem *j_dc_vlc[2][8]; // [quant], [select]
static const VLCElem *j_orient_vlc[2][4]; // [quant], [select]
static av_cold const VLCElem *x8_init_vlc(VLCInitState *state, int nb_bits,
int nb_codes, const uint8_t table[][2])
{
return ff_vlc_init_tables_from_lengths(state, nb_bits, nb_codes, &table[0][1], 2,
&table[0][0], 2, 1, 0, 0);
}
static av_cold void x8_vlc_init(void)
{
static VLCElem vlc_buf[VLC_BUFFER_SIZE];
VLCInitState state = VLC_INIT_STATE(vlc_buf);
int i;
// set ac tables
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++)
for (int k = 0; k < 8; k++)
j_ac_vlc[i][j][k] = x8_init_vlc(&state, AC_VLC_BITS, 77,
x8_ac_quant_table[i][j][k]);
// set dc tables
for (int i = 0; i < 2; i++)
for (int j = 0; j < 8; j++)
j_dc_vlc[i][j] = x8_init_vlc(&state, DC_VLC_BITS, 34,
x8_dc_quant_table[i][j]);
// set orient tables
for (i = 0; i < 2; i++)
j_orient_vlc[0][i] = x8_init_vlc(&state, OR_VLC_BITS, 12,
x8_orient_highquant_table[i]);
for (i = 0; i < 4; i++)
j_orient_vlc[1][i] = x8_init_vlc(&state, OR_VLC_BITS, 12,
x8_orient_lowquant_table[i]);
}
static void x8_reset_vlc_tables(IntraX8Context *w)
{
memset(w->j_dc_vlc_table, 0, sizeof(w->j_dc_vlc_table));
memset(w->j_ac_vlc_table, 0, sizeof(w->j_ac_vlc_table));
w->j_orient_vlc_table = NULL;
}
static inline void x8_select_ac_table(IntraX8Context *const w, int mode)
{
int table_index;
av_assert2(mode < 4);
if (w->j_ac_vlc_table[mode])
return;
table_index = get_bits(w->gb, 3);
// 2 modes use same tables
w->j_ac_vlc_table[mode] = j_ac_vlc[w->quant < 13][mode >> 1][table_index];
av_assert2(w->j_ac_vlc_table[mode]);
}
static inline int x8_get_orient_vlc(IntraX8Context *w)
{
if (!w->j_orient_vlc_table) {
int table_index = get_bits(w->gb, 1 + (w->quant < 13));
w->j_orient_vlc_table = j_orient_vlc[w->quant < 13][table_index];
}
return get_vlc2(w->gb, w->j_orient_vlc_table, OR_VLC_BITS, OR_VLC_MTD);
}
#define extra_bits(eb) (eb) // 3 bits
#define extra_run (0xFF << 8) // 1 bit
#define extra_level (0x00 << 8) // 1 bit
#define run_offset(r) ((r) << 16) // 6 bits
#define level_offset(l) ((l) << 24) // 5 bits
static const uint32_t ac_decode_table[] = {
/* 46 */ extra_bits(3) | extra_run | run_offset(16) | level_offset(0),
/* 47 */ extra_bits(3) | extra_run | run_offset(24) | level_offset(0),
/* 48 */ extra_bits(2) | extra_run | run_offset(4) | level_offset(1),
/* 49 */ extra_bits(3) | extra_run | run_offset(8) | level_offset(1),
/* 50 */ extra_bits(5) | extra_run | run_offset(32) | level_offset(0),
/* 51 */ extra_bits(4) | extra_run | run_offset(16) | level_offset(1),
/* 52 */ extra_bits(2) | extra_level | run_offset(0) | level_offset(4),
/* 53 */ extra_bits(2) | extra_level | run_offset(0) | level_offset(8),
/* 54 */ extra_bits(2) | extra_level | run_offset(0) | level_offset(12),
/* 55 */ extra_bits(3) | extra_level | run_offset(0) | level_offset(16),
/* 56 */ extra_bits(3) | extra_level | run_offset(0) | level_offset(24),
/* 57 */ extra_bits(2) | extra_level | run_offset(1) | level_offset(3),
/* 58 */ extra_bits(3) | extra_level | run_offset(1) | level_offset(7),
/* 59 */ extra_bits(2) | extra_run | run_offset(16) | level_offset(0),
/* 60 */ extra_bits(2) | extra_run | run_offset(20) | level_offset(0),
/* 61 */ extra_bits(2) | extra_run | run_offset(24) | level_offset(0),
/* 62 */ extra_bits(2) | extra_run | run_offset(28) | level_offset(0),
/* 63 */ extra_bits(4) | extra_run | run_offset(32) | level_offset(0),
/* 64 */ extra_bits(4) | extra_run | run_offset(48) | level_offset(0),
/* 65 */ extra_bits(2) | extra_run | run_offset(4) | level_offset(1),
/* 66 */ extra_bits(3) | extra_run | run_offset(8) | level_offset(1),
/* 67 */ extra_bits(4) | extra_run | run_offset(16) | level_offset(1),
/* 68 */ extra_bits(2) | extra_level | run_offset(0) | level_offset(4),
/* 69 */ extra_bits(3) | extra_level | run_offset(0) | level_offset(8),
/* 70 */ extra_bits(4) | extra_level | run_offset(0) | level_offset(16),
/* 71 */ extra_bits(2) | extra_level | run_offset(1) | level_offset(3),
/* 72 */ extra_bits(3) | extra_level | run_offset(1) | level_offset(7),
};
#undef extra_bits
#undef extra_run
#undef extra_level
#undef run_offset
#undef level_offset
static void x8_get_ac_rlf(IntraX8Context *const w, const int mode,
int *const run, int *const level, int *const final)
{
int i, e;
// x8_select_ac_table(w, mode);
i = get_vlc2(w->gb, w->j_ac_vlc_table[mode], AC_VLC_BITS, AC_VLC_MTD);
if (i < 46) { // [0-45]
int t, l;
if (i < 0) {
*level =
*final = // prevent 'may be used uninitialized'
*run = 64; // this would cause error exit in the ac loop
return;
}
/*
* i == 0-15 r = 0-15 l = 0; r = i & %01111
* i == 16-19 r = 0-3 l = 1; r = i & %00011
* i == 20-21 r = 0-1 l = 2; r = i & %00001
* i == 22 r = 0 l = 3; r = i & %00000
*/
*final =
t = i > 22;
i -= 23 * t;
/* l = lut_l[i / 2] = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3 }[i >> 1];
* 11 10'01 01'00 00'00 00'00 00'00 00 => 0xE50000 */
l = (0xE50000 >> (i & 0x1E)) & 3; // 0x1E or ~1 or (i >> 1 << 1)
/* t = lut_mask[l] = { 0x0f, 0x03, 0x01, 0x00 }[l];
* as i < 256 the higher bits do not matter */
t = 0x01030F >> (l << 3);
*run = i & t;
*level = l;
} else if (i < 73) { // [46-72]
uint32_t sm;
uint32_t mask;
i -= 46;
sm = ac_decode_table[i];
e = get_bits(w->gb, sm & 0xF);
sm >>= 8; // 3 bits
mask = sm & 0xff;
sm >>= 8; // 1 bit
*run = (sm & 0xff) + (e & mask); // 6 bits
*level = (sm >> 8) + (e & ~mask); // 5 bits
*final = i > (58 - 46);
} else if (i < 75) { // [73-74]
static const uint8_t crazy_mix_runlevel[32] = {
0x22, 0x32, 0x33, 0x53, 0x23, 0x42, 0x43, 0x63,
0x24, 0x52, 0x34, 0x73, 0x25, 0x62, 0x44, 0x83,
0x26, 0x72, 0x35, 0x54, 0x27, 0x82, 0x45, 0x64,
0x28, 0x92, 0x36, 0x74, 0x29, 0xa2, 0x46, 0x84,
};
*final = !(i & 1);
e = get_bits(w->gb, 5); // get the extra bits
*run = crazy_mix_runlevel[e] >> 4;
*level = crazy_mix_runlevel[e] & 0x0F;
} else {
*level = get_bits(w->gb, 7 - 3 * (i & 1));
*run = get_bits(w->gb, 6);
*final = get_bits1(w->gb);
}
return;
}
/* static const uint8_t dc_extra_sbits[] = {
* 0, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7,
* }; */
static const uint8_t dc_index_offset[] = {
0, 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
};
static int x8_get_dc_rlf(IntraX8Context *const w, const int mode,
int *const level, int *const final)
{
int i, e, c;
av_assert2(mode < 3);
if (!w->j_dc_vlc_table[mode]) {
int table_index = get_bits(w->gb, 3);
// 4 modes, same table
w->j_dc_vlc_table[mode] = j_dc_vlc[w->quant < 13][table_index];
}
i = get_vlc2(w->gb, w->j_dc_vlc_table[mode], DC_VLC_BITS, DC_VLC_MTD);
/* (i >= 17) { i -= 17; final =1; } */
c = i > 16;
*final = c;
i -= 17 * c;
if (i <= 0) {
*level = 0;
return -i;
}
c = (i + 1) >> 1; // hackish way to calculate dc_extra_sbits[]
c -= c > 1;
e = get_bits(w->gb, c); // get the extra bits
i = dc_index_offset[i] + (e >> 1);
e = -(e & 1); // 0, 0xffffff
*level = (i ^ e) - e; // (i ^ 0) - 0, (i ^ 0xff) - (-1)
return 0;
}
// end of huffman
static int x8_setup_spatial_predictor(IntraX8Context *const w, const int chroma)
{
int range;
int sum;
int quant;
w->dsp.setup_spatial_compensation(w->dest[chroma], w->scratchpad,
w->frame->linesize[chroma > 0],
&range, &sum, w->edges);
if (chroma) {
w->orient = w->chroma_orient;
quant = w->quant_dc_chroma;
} else {
quant = w->quant;
}
w->flat_dc = 0;
if (range < quant || range < 3) {
w->orient = 0;
// yep you read right, a +-1 idct error may break decoding!
if (range < 3) {
w->flat_dc = 1;
sum += 9;
// ((1 << 17) + 9) / (8 + 8 + 1 + 2) = 6899
w->predicted_dc = sum * 6899 >> 17;
}
}
if (chroma)
return 0;
av_assert2(w->orient < 3);
if (range < 2 * w->quant) {
if ((w->edges & 3) == 0) {
if (w->orient == 1)
w->orient = 11;
if (w->orient == 2)
w->orient = 10;
} else {
w->orient = 0;
}
w->raw_orient = 0;
} else {
static const uint8_t prediction_table[3][12] = {
{ 0, 8, 4, 10, 11, 2, 6, 9, 1, 3, 5, 7 },
{ 4, 0, 8, 11, 10, 3, 5, 2, 6, 9, 1, 7 },
{ 8, 0, 4, 10, 11, 1, 7, 2, 6, 9, 3, 5 },
};
w->raw_orient = x8_get_orient_vlc(w);
if (w->raw_orient < 0)
return -1;
av_assert2(w->raw_orient < 12);
av_assert2(w->orient < 3);
w->orient=prediction_table[w->orient][w->raw_orient];
}
return 0;
}
static void x8_update_predictions(IntraX8Context *const w, const int orient,
const int est_run)
{
w->prediction_table[w->mb_x * 2 + (w->mb_y & 1)] = (est_run << 2) + 1 * (orient == 4) + 2 * (orient == 8);
/*
* y = 2n + 0 -> // 0 2 4
* y = 2n + 1 -> // 1 3 5
*/
}
static void x8_get_prediction_chroma(IntraX8Context *const w)
{
w->edges = 1 * !(w->mb_x >> 1);
w->edges |= 2 * !(w->mb_y >> 1);
w->edges |= 4 * (w->mb_x >= (2 * w->mb_width - 1)); // mb_x for chroma would always be odd
w->raw_orient = 0;
// lut_co[8] = {inv,4,8,8, inv,4,8,8} <- => {1,1,0,0;1,1,0,0} => 0xCC
if (w->edges & 3) {
w->chroma_orient = 4 << ((0xCC >> w->edges) & 1);
return;
}
// block[x - 1][y | 1 - 1)]
w->chroma_orient = (w->prediction_table[2 * w->mb_x - 2] & 0x03) << 2;
}
static void x8_get_prediction(IntraX8Context *const w)
{
int a, b, c, i;
w->edges = 1 * !w->mb_x;
w->edges |= 2 * !w->mb_y;
w->edges |= 4 * (w->mb_x >= (2 * w->mb_width - 1));
switch (w->edges & 3) {
case 0:
break;
case 1:
// take the one from the above block[0][y - 1]
w->est_run = w->prediction_table[!(w->mb_y & 1)] >> 2;
w->orient = 1;
return;
case 2:
// take the one from the previous block[x - 1][0]
w->est_run = w->prediction_table[2 * w->mb_x - 2] >> 2;
w->orient = 2;
return;
case 3:
w->est_run = 16;
w->orient = 0;
return;
}
// no edge cases
b = w->prediction_table[2 * w->mb_x + !(w->mb_y & 1)]; // block[x ][y - 1]
a = w->prediction_table[2 * w->mb_x - 2 + (w->mb_y & 1)]; // block[x - 1][y ]
c = w->prediction_table[2 * w->mb_x - 2 + !(w->mb_y & 1)]; // block[x - 1][y - 1]
w->est_run = FFMIN(b, a);
/* This condition has nothing to do with w->edges, even if it looks
* similar it would trigger if e.g. x = 3; y = 2;
* I guess somebody wrote something wrong and it became standard. */
if ((w->mb_x & w->mb_y) != 0)
w->est_run = FFMIN(c, w->est_run);
w->est_run >>= 2;
a &= 3;
b &= 3;
c &= 3;
i = (0xFFEAF4C4 >> (2 * b + 8 * a)) & 3;
if (i != 3)
w->orient = i;
else
w->orient = (0xFFEAD8 >> (2 * c + 8 * (w->quant > 12))) & 3;
/*
* lut1[b][a] = {
* ->{ 0, 1, 0, pad },
* { 0, 1, X, pad },
* { 2, 2, 2, pad }
* }
* pad 2 2 2;
* pad X 1 0;
* pad 0 1 0 <-
* -> 11 10 '10 10 '11 11'01 00 '11 00'01 00 => 0xEAF4C4
*
* lut2[q>12][c] = {
* ->{ 0, 2, 1, pad},
* { 2, 2, 2, pad}
* }
* pad 2 2 2;
* pad 1 2 0 <-
* -> 11 10'10 10 '11 01'10 00 => 0xEAD8
*/
}
static void x8_ac_compensation(IntraX8Context *const w, const int direction,
const int dc_level)
{
int t;
#define B(x,y) w->block[0][w->idct_permutation[(x) + (y) * 8]]
#define T(x) ((x) * dc_level + 0x8000) >> 16;
switch (direction) {
case 0:
t = T(3811); // h
B(1, 0) -= t;
B(0, 1) -= t;
t = T(487); // e
B(2, 0) -= t;
B(0, 2) -= t;
t = T(506); // f
B(3, 0) -= t;
B(0, 3) -= t;
t = T(135); // c
B(4, 0) -= t;
B(0, 4) -= t;
B(2, 1) += t;
B(1, 2) += t;
B(3, 1) += t;
B(1, 3) += t;
t = T(173); // d
B(5, 0) -= t;
B(0, 5) -= t;
t = T(61); // b
B(6, 0) -= t;
B(0, 6) -= t;
B(5, 1) += t;
B(1, 5) += t;
t = T(42); // a
B(7, 0) -= t;
B(0, 7) -= t;
B(4, 1) += t;
B(1, 4) += t;
B(4, 4) += t;
t = T(1084); // g
B(1, 1) += t;
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7 * 8);
break;
case 1:
B(0, 1) -= T(6269);
B(0, 3) -= T(708);
B(0, 5) -= T(172);
B(0, 7) -= T(73);
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7 * 8);
break;
case 2:
B(1, 0) -= T(6269);
B(3, 0) -= T(708);
B(5, 0) -= T(172);
B(7, 0) -= T(73);
w->block_last_index[0] = FFMAX(w->block_last_index[0], 7);
break;
}
#undef B
#undef T
}
static void dsp_x8_put_solidcolor(const uint8_t pix, uint8_t *dst,
const ptrdiff_t linesize)
{
int k;
for (k = 0; k < 8; k++) {
memset(dst, pix, 8);
dst += linesize;
}
}
static const int16_t quant_table[64] = {
256, 256, 256, 256, 256, 256, 259, 262,
265, 269, 272, 275, 278, 282, 285, 288,
292, 295, 299, 303, 306, 310, 314, 317,
321, 325, 329, 333, 337, 341, 345, 349,
353, 358, 362, 366, 371, 375, 379, 384,
389, 393, 398, 403, 408, 413, 417, 422,
428, 433, 438, 443, 448, 454, 459, 465,
470, 476, 482, 488, 493, 499, 505, 511,
};
static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
{
uint8_t *scantable;
int final, run, level;
int ac_mode, dc_mode, est_run, dc_level;
int pos, n;
int zeros_only;
int use_quant_matrix;
int sign;
av_assert2(w->orient < 12);
w->bdsp.clear_block(w->block[0]);
if (chroma)
dc_mode = 2;
else
dc_mode = !!w->est_run; // 0, 1
if (x8_get_dc_rlf(w, dc_mode, &dc_level, &final))
return -1;
n = 0;
zeros_only = 0;
if (!final) { // decode ac
use_quant_matrix = w->use_quant_matrix;
if (chroma) {
ac_mode = 1;
est_run = 64; // not used
} else {
if (w->raw_orient < 3)
use_quant_matrix = 0;
if (w->raw_orient > 4) {
ac_mode = 0;
est_run = 64;
} else {
if (w->est_run > 1) {
ac_mode = 2;
est_run = w->est_run;
} else {
ac_mode = 3;
est_run = 64;
}
}
}
x8_select_ac_table(w, ac_mode);
/* scantable_selector[12] = { 0, 2, 0, 1, 1, 1, 0, 2, 2, 0, 1, 2 }; <-
* -> 10'01' 00'10' 10'00' 01'01' 01'00' 10'00 => 0x928548 */
scantable = w->permutated_scantable[(0x928548 >> (2 * w->orient)) & 3];
pos = 0;
do {
n++;
if (n >= est_run) {
ac_mode = 3;
x8_select_ac_table(w, 3);
}
x8_get_ac_rlf(w, ac_mode, &run, &level, &final);
pos += run + 1;
if (pos > 63) {
// this also handles vlc error in x8_get_ac_rlf
return -1;
}
level = (level + 1) * w->dquant;
level += w->qsum;
sign = -get_bits1(w->gb);
level = (level ^ sign) - sign;
if (use_quant_matrix)
level = (level * quant_table[pos]) >> 8;
w->block[0][scantable[pos]] = level;
} while (!final);
w->block_last_index[0] = pos;
} else { // DC only
w->block_last_index[0] = 0;
if (w->flat_dc && ((unsigned) (dc_level + 1)) < 3) { // [-1; 1]
int32_t divide_quant = !chroma ? w->divide_quant_dc_luma
: w->divide_quant_dc_chroma;
int32_t dc_quant = !chroma ? w->quant
: w->quant_dc_chroma;
// original intent dc_level += predicted_dc/quant;
// but it got lost somewhere in the rounding
dc_level += (w->predicted_dc * divide_quant + (1 << 12)) >> 13;
dsp_x8_put_solidcolor(av_clip_uint8((dc_level * dc_quant + 4) >> 3),
w->dest[chroma],
w->frame->linesize[!!chroma]);
goto block_placed;
}
zeros_only = dc_level == 0;
}
if (!chroma)
w->block[0][0] = dc_level * w->quant;
else
w->block[0][0] = dc_level * w->quant_dc_chroma;
// there is !zero_only check in the original, but dc_level check is enough
if ((unsigned int) (dc_level + 1) >= 3 && (w->edges & 3) != 3) {
int direction;
/* ac_comp_direction[orient] = { 0, 3, 3, 1, 1, 0, 0, 0, 2, 2, 2, 1 }; <-
* -> 01'10' 10'10' 00'00' 00'01' 01'11' 11'00 => 0x6A017C */
direction = (0x6A017C >> (w->orient * 2)) & 3;
if (direction != 3) {
// modify block_last[]
x8_ac_compensation(w, direction, w->block[0][0]);
}
}
if (w->flat_dc) {
dsp_x8_put_solidcolor(w->predicted_dc, w->dest[chroma],
w->frame->linesize[!!chroma]);
} else {
w->dsp.spatial_compensation[w->orient](w->scratchpad,
w->dest[chroma],
w->frame->linesize[!!chroma]);
}
if (!zeros_only)
w->wdsp.idct_add(w->dest[chroma],
w->frame->linesize[!!chroma],
w->block[0]);
block_placed:
if (!chroma)
x8_update_predictions(w, w->orient, n);
if (w->loopfilter) {
uint8_t *ptr = w->dest[chroma];
ptrdiff_t linesize = w->frame->linesize[!!chroma];
if (!((w->edges & 2) || (zeros_only && (w->orient | 4) == 4)))
w->dsp.h_loop_filter(ptr, linesize, w->quant);
if (!((w->edges & 1) || (zeros_only && (w->orient | 8) == 8)))
w->dsp.v_loop_filter(ptr, linesize, w->quant);
}
return 0;
}
// FIXME maybe merge with ff_*
static void x8_init_block_index(IntraX8Context *w, AVFrame *frame)
{
// not parent codec linesize as this would be wrong for field pics
// not that IntraX8 has interlacing support ;)
const ptrdiff_t linesize = frame->linesize[0];
const ptrdiff_t uvlinesize = frame->linesize[1];
w->dest[0] = frame->data[0];
w->dest[1] = frame->data[1];
w->dest[2] = frame->data[2];
w->dest[0] += w->mb_y * linesize << 3;
// chroma blocks are on add rows
w->dest[1] += (w->mb_y & ~1) * uvlinesize << 2;
w->dest[2] += (w->mb_y & ~1) * uvlinesize << 2;
}
av_cold int ff_intrax8_common_init(AVCodecContext *avctx,
IntraX8Context *w,
int16_t (*block)[64],
int block_last_index[12],
int mb_width, int mb_height)
{
static AVOnce init_static_once = AV_ONCE_INIT;
w->avctx = avctx;
w->mb_width = mb_width;
w->mb_height = mb_height;
w->block = block;
w->block_last_index = block_last_index;
// two rows, 2 blocks per cannon mb
w->prediction_table = av_mallocz(w->mb_width * 2 * 2);
if (!w->prediction_table)
return AVERROR(ENOMEM);
ff_wmv2dsp_init(&w->wdsp);
ff_init_scantable_permutation(w->idct_permutation,
w->wdsp.idct_perm);
ff_permute_scantable(w->permutated_scantable[0], ff_wmv1_scantable[0],
w->idct_permutation);
ff_permute_scantable(w->permutated_scantable[1], ff_wmv1_scantable[2],
w->idct_permutation);
ff_permute_scantable(w->permutated_scantable[2], ff_wmv1_scantable[3],
w->idct_permutation);
ff_intrax8dsp_init(&w->dsp);
ff_blockdsp_init(&w->bdsp);
ff_thread_once(&init_static_once, x8_vlc_init);
return 0;
}
av_cold void ff_intrax8_common_end(IntraX8Context *w)
{
av_freep(&w->prediction_table);
}
int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict,
GetBitContext *gb, int *mb_x, int *mb_y,
int dquant, int quant_offset,
int loopfilter, int lowdelay)
{
int mb_xy;
w->gb = gb;
w->dquant = dquant;
w->quant = dquant >> 1;
w->qsum = quant_offset;
w->frame = pict->f;
w->loopfilter = loopfilter;
w->use_quant_matrix = get_bits1(w->gb);
w->mb_x = *mb_x;
w->mb_y = *mb_y;
w->divide_quant_dc_luma = ((1 << 16) + (w->quant >> 1)) / w->quant;
if (w->quant < 5) {
w->quant_dc_chroma = w->quant;
w->divide_quant_dc_chroma = w->divide_quant_dc_luma;
} else {
w->quant_dc_chroma = w->quant + ((w->quant + 3) >> 3);
w->divide_quant_dc_chroma = ((1 << 16) + (w->quant_dc_chroma >> 1)) / w->quant_dc_chroma;
}
x8_reset_vlc_tables(w);
for (w->mb_y = 0; w->mb_y < w->mb_height * 2; w->mb_y++) {
x8_init_block_index(w, w->frame);
mb_xy = (w->mb_y >> 1) * (w->mb_width + 1);
if (get_bits_left(gb) < 1)
goto error;
for (w->mb_x = 0; w->mb_x < w->mb_width * 2; w->mb_x++) {
x8_get_prediction(w);
if (x8_setup_spatial_predictor(w, 0))
goto error;
if (x8_decode_intra_mb(w, 0))
goto error;
if (w->mb_x & w->mb_y & 1) {
x8_get_prediction_chroma(w);
/* when setting up chroma, no vlc is read,
* so no error condition can be reached */
x8_setup_spatial_predictor(w, 1);
if (x8_decode_intra_mb(w, 1))
goto error;
x8_setup_spatial_predictor(w, 2);
if (x8_decode_intra_mb(w, 2))
goto error;
w->dest[1] += 8;
w->dest[2] += 8;
pict->qscale_table[mb_xy] = w->quant;
mb_xy++;
}
w->dest[0] += 8;
}
if (w->mb_y & 1)
ff_draw_horiz_band(w->avctx, w->frame, w->frame,
(w->mb_y - 1) * 8, 16,
PICT_FRAME, 0, lowdelay);
}
error:
*mb_x = w->mb_x;
*mb_y = w->mb_y;
return 0;
}
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