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slicedecode.cpp
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slicedecode.cpp
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/*
* slice.c
* Copyright (C) 2000-2003 Michel Lespinasse <[email protected]>
* Copyright (C) 2003 Peter Gubanov <[email protected]>
* Copyright (C) 1999-2000 Aaron Holtzman <[email protected]>
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
* See http://libmpeg2.sourceforge.net/ for updates.
*
* mpeg2dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpeg2dec 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <inttypes.h>
#include "mpeg2.h"
#include "attributes.h"
#include "mpeg2_internal.h"
#include "mpegheader.hpp"
#include "picture.hpp"
#include <stdio.h>
extern mpeg2_mc_t mpeg2_mc;
#include "vlc.h"
#include "mmx.h"
static inline int get_macroblock_modes (mpeg2_decoder_t * const decoder)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
int macroblock_modes;
const MBtab * tab;
switch (decoder->coding_type) {
case I_TYPE:
tab = MB_I + UBITS (bit_buf, 1);
DUMPBITS (bit_buf, bits, tab->len);
macroblock_modes = tab->modes;
if ((! (decoder->frame_pred_frame_dct)) &&
(decoder->picture_structure == FRAME_PICTURE)) {
macroblock_modes |= UBITS (bit_buf, 1) * DCT_TYPE_INTERLACED;
DUMPBITS (bit_buf, bits, 1);
}
return macroblock_modes;
case P_TYPE:
tab = MB_P + UBITS (bit_buf, 5);
DUMPBITS (bit_buf, bits, tab->len);
macroblock_modes = tab->modes;
if (decoder->picture_structure != FRAME_PICTURE) {
if (macroblock_modes & MACROBLOCK_MOTION_FORWARD) {
macroblock_modes |= UBITS (bit_buf, 2) << MOTION_TYPE_SHIFT;
DUMPBITS (bit_buf, bits, 2);
}
return macroblock_modes | MACROBLOCK_MOTION_FORWARD;
} else if (decoder->frame_pred_frame_dct) {
if (macroblock_modes & MACROBLOCK_MOTION_FORWARD)
macroblock_modes |= MC_FRAME << MOTION_TYPE_SHIFT;
return macroblock_modes | MACROBLOCK_MOTION_FORWARD;
} else {
if (macroblock_modes & MACROBLOCK_MOTION_FORWARD) {
macroblock_modes |= UBITS (bit_buf, 2) << MOTION_TYPE_SHIFT;
DUMPBITS (bit_buf, bits, 2);
}
if (macroblock_modes & (MACROBLOCK_INTRA | MACROBLOCK_PATTERN)) {
macroblock_modes |= UBITS (bit_buf, 1) * DCT_TYPE_INTERLACED;
DUMPBITS (bit_buf, bits, 1);
}
return macroblock_modes | MACROBLOCK_MOTION_FORWARD;
}
case B_TYPE:
tab = MB_B + UBITS (bit_buf, 6);
DUMPBITS (bit_buf, bits, tab->len);
macroblock_modes = tab->modes;
if (decoder->picture_structure != FRAME_PICTURE) {
if (! (macroblock_modes & MACROBLOCK_INTRA)) {
macroblock_modes |= UBITS (bit_buf, 2) << MOTION_TYPE_SHIFT;
DUMPBITS (bit_buf, bits, 2);
}
return macroblock_modes;
} else if (decoder->frame_pred_frame_dct) {
/* if (! (macroblock_modes & MACROBLOCK_INTRA)) */
macroblock_modes |= MC_FRAME << MOTION_TYPE_SHIFT;
return macroblock_modes;
} else {
if (macroblock_modes & MACROBLOCK_INTRA)
goto intra;
macroblock_modes |= UBITS (bit_buf, 2) << MOTION_TYPE_SHIFT;
DUMPBITS (bit_buf, bits, 2);
if (macroblock_modes & (MACROBLOCK_INTRA | MACROBLOCK_PATTERN)) {
intra:
macroblock_modes |= UBITS (bit_buf, 1) * DCT_TYPE_INTERLACED;
DUMPBITS (bit_buf, bits, 1);
}
return macroblock_modes;
}
case D_TYPE:
DUMPBITS (bit_buf, bits, 1);
return MACROBLOCK_INTRA;
default:
return 0;
}
#undef bit_buf
#undef bits
#undef bit_ptr
}
static inline void get_quantizer_scale (mpeg2_decoder_t * const decoder)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
int quantizer_scale_code;
quantizer_scale_code = UBITS (bit_buf, 5);
DUMPBITS (bit_buf, bits, 5);
decoder->quantizer_matrix[0] =
decoder->quantizer_prescale[0][quantizer_scale_code];
decoder->quantizer_matrix[1] =
decoder->quantizer_prescale[1][quantizer_scale_code];
decoder->quantizer_matrix[2] =
decoder->chroma_quantizer[0][quantizer_scale_code];
decoder->quantizer_matrix[3] =
decoder->chroma_quantizer[1][quantizer_scale_code];
#undef bit_buf
#undef bits
#undef bit_ptr
}
static inline int get_motion_delta (mpeg2_decoder_t * const decoder,
const int f_code)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
int delta;
int sign;
const MVtab * tab;
if (bit_buf & 0x80000000) {
DUMPBITS (bit_buf, bits, 1);
return 0;
} else if (bit_buf >= 0x0c000000) {
tab = MV_4 + UBITS (bit_buf, 4);
delta = (tab->delta << f_code) + 1;
bits += tab->len + f_code + 1;
bit_buf <<= tab->len;
sign = SBITS (bit_buf, 1);
bit_buf <<= 1;
if (f_code)
delta += UBITS (bit_buf, f_code);
bit_buf <<= f_code;
return (delta ^ sign) - sign;
} else {
tab = MV_10 + UBITS (bit_buf, 10);
delta = (tab->delta << f_code) + 1;
bits += tab->len + 1;
bit_buf <<= tab->len;
sign = SBITS (bit_buf, 1);
bit_buf <<= 1;
if (f_code) {
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
delta += UBITS (bit_buf, f_code);
DUMPBITS (bit_buf, bits, f_code);
}
return (delta ^ sign) - sign;
}
#undef bit_buf
#undef bits
#undef bit_ptr
}
static inline int bound_motion_vector (const int vector, const int f_code)
{
return ((int32_t)vector << (27 - f_code)) >> (27 - f_code);
}
static inline int get_dmv (mpeg2_decoder_t * const decoder)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
const DMVtab * tab;
tab = DMV_2 + UBITS (bit_buf, 2);
DUMPBITS (bit_buf, bits, tab->len);
return tab->dmv;
#undef bit_buf
#undef bits
#undef bit_ptr
}
static inline int get_coded_block_pattern (mpeg2_decoder_t * const decoder)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
const CBPtab * tab;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
if (bit_buf >= 0x20000000) {
tab = CBP_7 + (UBITS (bit_buf, 7) - 16);
DUMPBITS (bit_buf, bits, tab->len);
return tab->cbp;
} else {
tab = CBP_9 + UBITS (bit_buf, 9);
DUMPBITS (bit_buf, bits, tab->len);
return tab->cbp;
}
#undef bit_buf
#undef bits
#undef bit_ptr
}
static inline int get_luma_dc_dct_diff (mpeg2_decoder_t * const decoder)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
const DCtab * tab;
int size;
int dc_diff;
if (bit_buf < 0xf8000000) {
tab = DC_lum_5 + UBITS (bit_buf, 5);
size = tab->size;
if (size) {
bits += tab->len + size;
bit_buf <<= tab->len;
dc_diff =
UBITS (bit_buf, size) - UBITS (SBITS (~bit_buf, 1), size);
bit_buf <<= size;
return dc_diff << decoder->intra_dc_precision;
} else {
DUMPBITS (bit_buf, bits, 3);
return 0;
}
} else {
tab = DC_long + (UBITS (bit_buf, 9) - 0x1e0);
size = tab->size;
DUMPBITS (bit_buf, bits, tab->len);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
dc_diff = UBITS (bit_buf, size) - UBITS (SBITS (~bit_buf, 1), size);
DUMPBITS (bit_buf, bits, size);
return dc_diff << decoder->intra_dc_precision;
}
#undef bit_buf
#undef bits
#undef bit_ptr
}
static inline int get_chroma_dc_dct_diff (mpeg2_decoder_t * const decoder)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
const DCtab * tab;
int size;
int dc_diff;
if (bit_buf < 0xf8000000) {
tab = DC_chrom_5 + UBITS (bit_buf, 5);
size = tab->size;
if (size) {
bits += tab->len + size;
bit_buf <<= tab->len;
dc_diff =
UBITS (bit_buf, size) - UBITS (SBITS (~bit_buf, 1), size);
bit_buf <<= size;
return dc_diff << decoder->intra_dc_precision;
} else {
DUMPBITS (bit_buf, bits, 2);
return 0;
}
} else {
tab = DC_long + (UBITS (bit_buf, 10) - 0x3e0);
size = tab->size;
DUMPBITS (bit_buf, bits, tab->len + 1);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
dc_diff = UBITS (bit_buf, size) - UBITS (SBITS (~bit_buf, 1), size);
DUMPBITS (bit_buf, bits, size);
return dc_diff << decoder->intra_dc_precision;
}
#undef bit_buf
#undef bits
#undef bit_ptr
}
#define SATURATE(val) \
do { \
val <<= 4; \
if (unlikely (val != (int16_t) val)) \
val = (SBITS (val, 1) ^ 2047) << 4; \
} while (0)
static void get_intra_block_B14 (mpeg2_decoder_t * const decoder,
const uint16_t * const quant_matrix)
{
int i;
int j;
int val;
const uint8_t * const scan = decoder->scan;
int mismatch;
const DCTtab * tab;
uint32_t bit_buf;
int bits;
const uint8_t * bit_ptr;
int16_t * const dest = decoder->DCTblock;
i = 0;
mismatch = ~dest[0];
bit_buf = decoder->bitstream_buf;
bits = decoder->bitstream_bits;
bit_ptr = decoder->bitstream_ptr;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
while (1) {
if (bit_buf >= 0x28000000) {
tab = DCT_B14AC_5 + (UBITS (bit_buf, 5) - 5);
i += tab->run;
if (i >= 64)
break; /* end of block */
normal_code:
j = scan[i];
bit_buf <<= tab->len;
bits += tab->len + 1;
val = (tab->level * quant_matrix[j]) >> 4;
/* if (bitstream_get (1)) val = -val; */
val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
SATURATE (val);
dest[j] = val;
mismatch ^= val;
bit_buf <<= 1;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
} else if (bit_buf >= 0x04000000) {
tab = DCT_B14_8 + (UBITS (bit_buf, 8) - 4);
i += tab->run;
if (i < 64)
goto normal_code;
/* escape code */
i += UBITS (bit_buf << 6, 6) - 64;
if (i >= 64) {
throw MPEGInvalid();
break; /* illegal, check needed to avoid buffer overflow */
}
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
val = (SBITS (bit_buf, 12) * quant_matrix[j]) / 16;
SATURATE (val);
dest[j] = val;
mismatch ^= val;
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
} else if (bit_buf >= 0x02000000) {
tab = DCT_B14_10 + (UBITS (bit_buf, 10) - 8);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00800000) {
tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00200000) {
tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else {
tab = DCT_16 + UBITS (bit_buf, 16);
DUMPBITS(bit_buf, bits, 16 );
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end );
i += tab->run;
if (i < 64)
goto normal_code;
}
// throw MPEGInvalid();
// fprintf( stderr, "Suspected invalid block.\n" );
decoder->invalid = true;
break; /* illegal, check needed to avoid buffer overflow */
}
dest[63] ^= mismatch & 16;
DUMPBITS (bit_buf, bits, tab->len); /* dump end of block code */
decoder->bitstream_buf = bit_buf;
decoder->bitstream_bits = bits;
decoder->bitstream_ptr = bit_ptr;
}
static void get_intra_block_B15 (mpeg2_decoder_t * const decoder,
const uint16_t * const quant_matrix)
{
int i;
int j;
int val;
const uint8_t * const scan = decoder->scan;
int mismatch;
const DCTtab * tab;
uint32_t bit_buf;
int bits;
const uint8_t * bit_ptr;
int16_t * const dest = decoder->DCTblock;
i = 0;
mismatch = ~dest[0];
bit_buf = decoder->bitstream_buf;
bits = decoder->bitstream_bits;
bit_ptr = decoder->bitstream_ptr;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
while (1) {
if (bit_buf >= 0x04000000) {
tab = DCT_B15_8 + (UBITS (bit_buf, 8) - 4);
i += tab->run;
if (i < 64) {
normal_code:
j = scan[i];
bit_buf <<= tab->len;
bits += tab->len + 1;
val = (tab->level * quant_matrix[j]) >> 4;
/* if (bitstream_get (1)) val = -val; */
val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
SATURATE (val);
dest[j] = val;
mismatch ^= val;
bit_buf <<= 1;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
} else {
/* end of block. I commented out this code because if we */
/* do not exit here we will still exit at the later test :) */
/* if (i >= 128) break; */ /* end of block */
/* escape code */
i += UBITS (bit_buf << 6, 6) - 64;
if (i >= 64) {
// throw MPEGInvalid();
/* This seems to show up in all kinds of bitstreams -- KJW */
// fprintf( stderr, "Invalid macroblock.\n" );
break; /* illegal, check against buffer overflow */
}
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
val = (SBITS (bit_buf, 12) * quant_matrix[j]) / 16;
SATURATE (val);
dest[j] = val;
mismatch ^= val;
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
}
} else if (bit_buf >= 0x02000000) {
tab = DCT_B15_10 + (UBITS (bit_buf, 10) - 8);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00800000) {
tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00200000) {
tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else {
tab = DCT_16 + UBITS (bit_buf, 16);
DUMPBITS(bit_buf, bits, 16 );
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end );
i += tab->run;
if (i < 64)
goto normal_code;
}
// throw MPEGInvalid();
// fprintf( stderr, "Suspected invalid block.\n" );
decoder->invalid = true;
break; /* illegal, check needed to avoid buffer overflow */
}
dest[63] ^= mismatch & 16;
DUMPBITS (bit_buf, bits, tab->len); /* dump end of block code */
decoder->bitstream_buf = bit_buf;
decoder->bitstream_bits = bits;
decoder->bitstream_ptr = bit_ptr;
}
static int get_non_intra_block (mpeg2_decoder_t * const decoder,
const uint16_t * const quant_matrix)
{
int i;
int j;
int val;
const uint8_t * const scan = decoder->scan;
int mismatch;
const DCTtab * tab;
uint32_t bit_buf;
int bits;
const uint8_t * bit_ptr;
int16_t * const dest = decoder->DCTblock;
i = -1;
mismatch = -1;
bit_buf = decoder->bitstream_buf;
bits = decoder->bitstream_bits;
bit_ptr = decoder->bitstream_ptr;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
if (bit_buf >= 0x28000000) {
tab = DCT_B14DC_5 + (UBITS (bit_buf, 5) - 5);
goto entry_1;
} else
goto entry_2;
while (1) {
if (bit_buf >= 0x28000000) {
tab = DCT_B14AC_5 + (UBITS (bit_buf, 5) - 5);
entry_1:
i += tab->run;
if (i >= 64)
break; /* end of block */
normal_code:
j = scan[i];
bit_buf <<= tab->len;
bits += tab->len + 1;
val = ((2 * tab->level + 1) * quant_matrix[j]) >> 5;
/* if (bitstream_get (1)) val = -val; */
val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
SATURATE (val);
dest[j] = val;
mismatch ^= val;
bit_buf <<= 1;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
}
entry_2:
if (bit_buf >= 0x04000000) {
tab = DCT_B14_8 + (UBITS (bit_buf, 8) - 4);
i += tab->run;
if (i < 64)
goto normal_code;
/* escape code */
i += UBITS (bit_buf << 6, 6) - 64;
if (i >= 64) {
// throw MPEGInvalid();
// fprintf( stderr, "Suspected invalid block.\n" );
decoder->invalid = true;
break; /* illegal, check needed to avoid buffer overflow */
}
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
val = 2 * (SBITS (bit_buf, 12) + SBITS (bit_buf, 1)) + 1;
val = (val * quant_matrix[j]) / 32;
SATURATE (val);
dest[j] = val;
mismatch ^= val;
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
} else if (bit_buf >= 0x02000000) {
tab = DCT_B14_10 + (UBITS (bit_buf, 10) - 8);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00800000) {
tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00200000) {
tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else {
tab = DCT_16 + UBITS (bit_buf, 16);
DUMPBITS(bit_buf, bits, 16 );
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end );
i += tab->run;
if (i < 64)
goto normal_code;
}
// fprintf( stderr, "Suspected invalid block.\n" );
decoder->invalid = true;
// throw MPEGInvalid();
break; /* illegal, check needed to avoid buffer overflow */
}
dest[63] ^= mismatch & 16;
DUMPBITS (bit_buf, bits, tab->len); /* dump end of block code */
decoder->bitstream_buf = bit_buf;
decoder->bitstream_bits = bits;
decoder->bitstream_ptr = bit_ptr;
return i;
}
static void get_mpeg1_intra_block (mpeg2_decoder_t * const decoder)
{
int i;
int j;
int val;
const uint8_t * const scan = decoder->scan;
const uint16_t * const quant_matrix = decoder->quantizer_matrix[0];
const DCTtab * tab;
uint32_t bit_buf;
int bits;
const uint8_t * bit_ptr;
int16_t * const dest = decoder->DCTblock;
i = 0;
bit_buf = decoder->bitstream_buf;
bits = decoder->bitstream_bits;
bit_ptr = decoder->bitstream_ptr;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
while (1) {
if (bit_buf >= 0x28000000) {
tab = DCT_B14AC_5 + (UBITS (bit_buf, 5) - 5);
i += tab->run;
if (i >= 64)
break; /* end of block */
normal_code:
j = scan[i];
bit_buf <<= tab->len;
bits += tab->len + 1;
val = (tab->level * quant_matrix[j]) >> 4;
/* oddification */
val = (val - 1) | 1;
/* if (bitstream_get (1)) val = -val; */
val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
SATURATE (val);
dest[j] = val;
bit_buf <<= 1;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
} else if (bit_buf >= 0x04000000) {
tab = DCT_B14_8 + (UBITS (bit_buf, 8) - 4);
i += tab->run;
if (i < 64)
goto normal_code;
/* escape code */
i += UBITS (bit_buf << 6, 6) - 64;
if (i >= 64) {
throw MPEGInvalid();
break; /* illegal, check needed to avoid buffer overflow */
}
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
val = SBITS (bit_buf, 8);
if (! (val & 0x7f)) {
DUMPBITS (bit_buf, bits, 8);
val = UBITS (bit_buf, 8) + 2 * val;
}
val = (val * quant_matrix[j]) / 16;
/* oddification */
val = (val + ~SBITS (val, 1)) | 1;
SATURATE (val);
dest[j] = val;
DUMPBITS (bit_buf, bits, 8);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
} else if (bit_buf >= 0x02000000) {
tab = DCT_B14_10 + (UBITS (bit_buf, 10) - 8);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00800000) {
tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00200000) {
tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else {
tab = DCT_16 + UBITS (bit_buf, 16);
DUMPBITS(bit_buf, bits, 16 );
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end );
i += tab->run;
if (i < 64)
goto normal_code;
}
throw MPEGInvalid();
break; /* illegal, check needed to avoid buffer overflow */
}
DUMPBITS (bit_buf, bits, tab->len); /* dump end of block code */
decoder->bitstream_buf = bit_buf;
decoder->bitstream_bits = bits;
decoder->bitstream_ptr = bit_ptr;
}
static int get_mpeg1_non_intra_block (mpeg2_decoder_t * const decoder)
{
int i;
int j;
int val;
const uint8_t * const scan = decoder->scan;
const uint16_t * const quant_matrix = decoder->quantizer_matrix[1];
const DCTtab * tab;
uint32_t bit_buf;
int bits;
const uint8_t * bit_ptr;
int16_t * const dest = decoder->DCTblock;
i = -1;
bit_buf = decoder->bitstream_buf;
bits = decoder->bitstream_bits;
bit_ptr = decoder->bitstream_ptr;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
if (bit_buf >= 0x28000000) {
tab = DCT_B14DC_5 + (UBITS (bit_buf, 5) - 5);
goto entry_1;
} else
goto entry_2;
while (1) {
if (bit_buf >= 0x28000000) {
tab = DCT_B14AC_5 + (UBITS (bit_buf, 5) - 5);
entry_1:
i += tab->run;
if (i >= 64)
break; /* end of block */
normal_code:
j = scan[i];
bit_buf <<= tab->len;
bits += tab->len + 1;
val = ((2 * tab->level + 1) * quant_matrix[j]) >> 5;
/* oddification */
val = (val - 1) | 1;
/* if (bitstream_get (1)) val = -val; */
val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
SATURATE (val);
dest[j] = val;
bit_buf <<= 1;
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
}
entry_2:
if (bit_buf >= 0x04000000) {
tab = DCT_B14_8 + (UBITS (bit_buf, 8) - 4);
i += tab->run;
if (i < 64)
goto normal_code;
/* escape code */
i += UBITS (bit_buf << 6, 6) - 64;
if (i >= 64) {
throw MPEGInvalid();
break; /* illegal, check needed to avoid buffer overflow */
}
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
val = SBITS (bit_buf, 8);
if (! (val & 0x7f)) {
DUMPBITS (bit_buf, bits, 8);
val = UBITS (bit_buf, 8) + 2 * val;
}
val = 2 * (val + SBITS (val, 1)) + 1;
val = (val * quant_matrix[j]) / 32;
/* oddification */
val = (val + ~SBITS (val, 1)) | 1;
SATURATE (val);
dest[j] = val;
DUMPBITS (bit_buf, bits, 8);
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
continue;
} else if (bit_buf >= 0x02000000) {
tab = DCT_B14_10 + (UBITS (bit_buf, 10) - 8);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00800000) {
tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else if (bit_buf >= 0x00200000) {
tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
i += tab->run;
if (i < 64)
goto normal_code;
} else {
tab = DCT_16 + UBITS (bit_buf, 16);
DUMPBITS(bit_buf, bits, 16 );
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end );
i += tab->run;
if (i < 64)
goto normal_code;
}
throw MPEGInvalid();
break; /* illegal, check needed to avoid buffer overflow */
}
DUMPBITS (bit_buf, bits, tab->len); /* dump end of block code */
decoder->bitstream_buf = bit_buf;
decoder->bitstream_bits = bits;
decoder->bitstream_ptr = bit_ptr;
return i;
}
static inline void slice_intra_DCT (mpeg2_decoder_t * const decoder,
const int cc,
uint8_t * const dest, const int stride)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
NEEDBITS (bit_buf, bits, bit_ptr, decoder->bit_ptr_end);
/* Get the intra DC coefficient and inverse quantize it */
if (cc == 0)
decoder->DCTblock[0] =
decoder->dc_dct_pred[0] += get_luma_dc_dct_diff (decoder);
else
decoder->DCTblock[0] =
decoder->dc_dct_pred[cc] += get_chroma_dc_dct_diff (decoder);
if (decoder->mpeg1) {
if (decoder->coding_type != D_TYPE)
get_mpeg1_intra_block (decoder);
} else if (decoder->intra_vlc_format)
get_intra_block_B15 (decoder, decoder->quantizer_matrix[cc ? 2 : 0]);
else
get_intra_block_B14 (decoder, decoder->quantizer_matrix[cc ? 2 : 0]);
mpeg2_idct_copy (decoder->DCTblock, dest, stride);
#undef bit_buf
#undef bits
#undef bit_ptr
}
static inline void slice_non_intra_DCT (mpeg2_decoder_t * const decoder,
const int cc,
uint8_t * const dest, const int stride)
{
int last;
if (decoder->mpeg1)
last = get_mpeg1_non_intra_block (decoder);
else