Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/apps/plugins/mpegplayer/slice.c

2368 lines
98 KiB
C
Raw Blame History

/*
* slice.c
* Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 2003 Peter Gubanov <peter@elecard.net.ru>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* 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 "plugin.h"
#include "mpeg2dec_config.h"
#include "mpeg2.h"
#include "attributes.h"
#include "mpeg2_internal.h"
#include "vlc.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);
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);
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);
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);
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);
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);
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)
break; /* illegal, check needed to avoid buffer overflow */
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr);
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);
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);
bit_buf <<= 16;
GETWORD (bit_buf, bits + 16, bit_ptr);
i += tab->run;
if (i < 64)
goto normal_code;
}
break; /* illegal, check needed to avoid buffer overflow */
}
dest[63] ^= mismatch & 16;
DUMPBITS (bit_buf, bits, 2); /* 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);
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);
continue;
}
else
{
/* end of block. I commented out this code because if we */
/* dont 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)
break; /* illegal, check against buffer overflow */
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr);
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);
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);
bit_buf <<= 16;
GETWORD (bit_buf, bits + 16, bit_ptr);
i += tab->run;
if (i < 64)
goto normal_code;
}
break; /* illegal, check needed to avoid buffer overflow */
}
dest[63] ^= mismatch & 16;
DUMPBITS (bit_buf, bits, 4); /* 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);
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);
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)
break; /* illegal, check needed to avoid buffer overflow */
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr);
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);
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);
bit_buf <<= 16;
GETWORD (bit_buf, bits + 16, bit_ptr);
i += tab->run;
if (i < 64)
goto normal_code;
}
break; /* illegal, check needed to avoid buffer overflow */
}
dest[63] ^= mismatch & 16;
DUMPBITS (bit_buf, bits, 2); /* 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);
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);
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)
break; /* illegal, check needed to avoid buffer overflow */
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr);
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);
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);
bit_buf <<= 16;
GETWORD (bit_buf, bits + 16, bit_ptr);
i += tab->run;
if (i < 64)
goto normal_code;
}
break; /* illegal, check needed to avoid buffer overflow */
}
DUMPBITS (bit_buf, bits, 2); /* 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);
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);
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)
break; /* illegal, check needed to avoid buffer overflow */
j = scan[i];
DUMPBITS (bit_buf, bits, 12);
NEEDBITS (bit_buf, bits, bit_ptr);
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);
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);
bit_buf <<= 16;
GETWORD (bit_buf, bits + 16, bit_ptr);
i += tab->run;
if (i < 64)
goto normal_code;
}
break; /* illegal, check needed to avoid buffer overflow */
}
DUMPBITS (bit_buf, bits, 2); /* 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);
/* Get the intra DC coefficient and inverse quantize it */
if (cc == 0)
{
decoder->dc_dct_pred[0] += get_luma_dc_dct_diff (decoder);
decoder->DCTblock[0] = decoder->dc_dct_pred[0];
}
else
{
decoder->dc_dct_pred[cc] += get_chroma_dc_dct_diff (decoder);
decoder->DCTblock[0] = decoder->dc_dct_pred[cc];
}
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
{
last = get_non_intra_block (decoder,
decoder->quantizer_matrix[cc ? 3 : 1]);
}
mpeg2_idct_add (last, decoder->DCTblock, dest, stride);
}
#define MOTION_420(table, ref, motion_x, motion_y, size, y) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = 2 * decoder->v_offset + motion_y + 2 * y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y_ ## size)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y_ ## size; \
motion_y = pos_y - 2 * decoder->v_offset - 2 * y; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
table[xy_half] (decoder->dest[0] + y * decoder->stride + decoder->offset, \
ref[0] + (pos_x >> 1) + (pos_y >> 1) * decoder->stride, \
decoder->stride, size); \
\
motion_x /= 2; \
motion_y /= 2; \
xy_half = ((motion_y & 1) << 1) | (motion_x & 1); \
offset = ((decoder->offset + motion_x) >> 1) + \
((((decoder->v_offset + motion_y) >> 1) + y/2) * \
decoder->uv_stride); \
\
table[4+xy_half] (decoder->dest[1] + y/2 * decoder->uv_stride + \
(decoder->offset >> 1), ref[1] + offset, \
decoder->uv_stride, size/2); \
table[4+xy_half] (decoder->dest[2] + y/2 * decoder->uv_stride + \
(decoder->offset >> 1), ref[2] + offset, \
decoder->uv_stride, size/2)
#define MOTION_FIELD_420(table, ref, motion_x, motion_y, \
dest_field, op, src_field) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = decoder->v_offset + motion_y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y; \
motion_y = pos_y - decoder->v_offset; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
table[xy_half] (decoder->dest[0] + dest_field * decoder->stride + \
decoder->offset, \
(ref[0] + (pos_x >> 1) + \
((pos_y op) + src_field) * decoder->stride), \
2 * decoder->stride, 8); \
\
motion_x /= 2; \
motion_y /= 2; \
xy_half = ((motion_y & 1) << 1) | (motion_x & 1); \
offset = ((decoder->offset + motion_x) >> 1) + \
(((decoder->v_offset >> 1) + (motion_y op) + src_field) * \
decoder->uv_stride); \
\
table[4+xy_half] (decoder->dest[1] + dest_field * decoder->uv_stride + \
(decoder->offset >> 1), ref[1] + offset, \
2 * decoder->uv_stride, 4); \
table[4+xy_half] (decoder->dest[2] + dest_field * decoder->uv_stride + \
(decoder->offset >> 1), ref[2] + offset, \
2 * decoder->uv_stride, 4)
#define MOTION_DMV_420(table, ref, motion_x, motion_y) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = decoder->v_offset + motion_y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y; \
motion_y = pos_y - decoder->v_offset; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
offset = (pos_x >> 1) + (pos_y & ~1) * decoder->stride; \
table[xy_half] (decoder->dest[0] + decoder->offset, \
ref[0] + offset, 2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[0] + decoder->stride + decoder->offset, \
ref[0] + decoder->stride + offset, \
2 * decoder->stride, 8); \
\
motion_x /= 2; \
motion_y /= 2; \
xy_half = ((motion_y & 1) << 1) | (motion_x & 1); \
offset = ((decoder->offset + motion_x) >> 1) + \
(((decoder->v_offset >> 1) + (motion_y & ~1)) * \
decoder->uv_stride); \
\
table[4+xy_half] (decoder->dest[1] + (decoder->offset >> 1), \
ref[1] + offset, 2 * decoder->uv_stride, 4); \
table[4+xy_half] (decoder->dest[1] + decoder->uv_stride + \
(decoder->offset >> 1), \
ref[1] + decoder->uv_stride + offset, \
2 * decoder->uv_stride, 4); \
table[4+xy_half] (decoder->dest[2] + (decoder->offset >> 1), \
ref[2] + offset, 2 * decoder->uv_stride, 4); \
table[4+xy_half] (decoder->dest[2] + decoder->uv_stride + \
(decoder->offset >> 1), \
ref[2] + decoder->uv_stride + offset, \
2 * decoder->uv_stride, 4)
#define MOTION_ZERO_420(table, ref) \
table[0] (decoder->dest[0] + decoder->offset, \
(ref[0] + decoder->offset + \
decoder->v_offset * decoder->stride), decoder->stride, 16); \
\
offset = ((decoder->offset >> 1) + \
(decoder->v_offset >> 1) * decoder->uv_stride); \
\
table[4] (decoder->dest[1] + (decoder->offset >> 1), \
ref[1] + offset, decoder->uv_stride, 8); \
table[4] (decoder->dest[2] + (decoder->offset >> 1), \
ref[2] + offset, decoder->uv_stride, 8)
#define MOTION_422(table, ref, motion_x, motion_y, size, y) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = 2 * decoder->v_offset + motion_y + 2 * y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y_ ## size)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y_ ## size; \
motion_y = pos_y - 2 * decoder->v_offset - 2 * y; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
offset = (pos_x >> 1) + (pos_y >> 1) * decoder->stride; \
\
table[xy_half] (decoder->dest[0] + y * decoder->stride + decoder->offset, \
ref[0] + offset, decoder->stride, size); \
\
offset = (offset + (motion_x & (motion_x < 0))) >> 1; \
motion_x /= 2; \
xy_half = ((pos_y & 1) << 1) | (motion_x & 1); \
\
table[4+xy_half] (decoder->dest[1] + y * decoder->uv_stride + \
(decoder->offset >> 1), ref[1] + offset, \
decoder->uv_stride, size); \
table[4+xy_half] (decoder->dest[2] + y * decoder->uv_stride + \
(decoder->offset >> 1), ref[2] + offset, \
decoder->uv_stride, size)
#define MOTION_FIELD_422(table, ref, motion_x, motion_y, \
dest_field, op, src_field) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = decoder->v_offset + motion_y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y; \
motion_y = pos_y - decoder->v_offset; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
offset = (pos_x >> 1) + ((pos_y op) + src_field) * decoder->stride; \
\
table[xy_half] (decoder->dest[0] + dest_field * decoder->stride + \
decoder->offset, ref[0] + offset, \
2 * decoder->stride, 8); \
\
offset = (offset + (motion_x & (motion_x < 0))) >> 1; \
motion_x /= 2; \
xy_half = ((pos_y & 1) << 1) | (motion_x & 1); \
\
table[4+xy_half] (decoder->dest[1] + dest_field * decoder->uv_stride + \
(decoder->offset >> 1), ref[1] + offset, \
2 * decoder->uv_stride, 8); \
table[4+xy_half] (decoder->dest[2] + dest_field * decoder->uv_stride + \
(decoder->offset >> 1), ref[2] + offset, \
2 * decoder->uv_stride, 8)
#define MOTION_DMV_422(table, ref, motion_x, motion_y) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = decoder->v_offset + motion_y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y; \
motion_y = pos_y - decoder->v_offset; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
offset = (pos_x >> 1) + (pos_y & ~1) * decoder->stride; \
\
table[xy_half] (decoder->dest[0] + decoder->offset, \
ref[0] + offset, 2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[0] + decoder->stride + decoder->offset, \
ref[0] + decoder->stride + offset, \
2 * decoder->stride, 8); \
\
offset = (offset + (motion_x & (motion_x < 0))) >> 1; \
motion_x /= 2; \
xy_half = ((pos_y & 1) << 1) | (motion_x & 1); \
\
table[4+xy_half] (decoder->dest[1] + (decoder->offset >> 1), \
ref[1] + offset, 2 * decoder->uv_stride, 8); \
table[4+xy_half] (decoder->dest[1] + decoder->uv_stride + \
(decoder->offset >> 1), \
ref[1] + decoder->uv_stride + offset, \
2 * decoder->uv_stride, 8); \
table[4+xy_half] (decoder->dest[2] + (decoder->offset >> 1), \
ref[2] + offset, 2 * decoder->uv_stride, 8); \
table[4+xy_half] (decoder->dest[2] + decoder->uv_stride + \
(decoder->offset >> 1), \
ref[2] + decoder->uv_stride + offset, \
2 * decoder->uv_stride, 8)
#define MOTION_ZERO_422(table, ref) \
offset = decoder->offset + decoder->v_offset * decoder->stride; \
table[0] (decoder->dest[0] + decoder->offset, \
ref[0] + offset, decoder->stride, 16); \
offset >>= 1; \
table[4] (decoder->dest[1] + (decoder->offset >> 1), \
ref[1] + offset, decoder->uv_stride, 16); \
table[4] (decoder->dest[2] + (decoder->offset >> 1), \
ref[2] + offset, decoder->uv_stride, 16)
#define MOTION_444(table, ref, motion_x, motion_y, size, y) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = 2 * decoder->v_offset + motion_y + 2 * y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y_ ## size)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y_ ## size; \
motion_y = pos_y - 2 * decoder->v_offset - 2 * y; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
offset = (pos_x >> 1) + (pos_y >> 1) * decoder->stride; \
\
table[xy_half] (decoder->dest[0] + y * decoder->stride + decoder->offset, \
ref[0] + offset, decoder->stride, size); \
table[xy_half] (decoder->dest[1] + y * decoder->stride + decoder->offset, \
ref[1] + offset, decoder->stride, size); \
table[xy_half] (decoder->dest[2] + y * decoder->stride + decoder->offset, \
ref[2] + offset, decoder->stride, size)
#define MOTION_FIELD_444(table, ref, motion_x, motion_y, \
dest_field, op, src_field) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = decoder->v_offset + motion_y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y; \
motion_y = pos_y - decoder->v_offset; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
offset = (pos_x >> 1) + ((pos_y op) + src_field) * decoder->stride; \
\
table[xy_half] (decoder->dest[0] + dest_field * decoder->stride + \
decoder->offset, ref[0] + offset, \
2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[1] + dest_field * decoder->stride + \
decoder->offset, ref[1] + offset, \
2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[2] + dest_field * decoder->stride + \
decoder->offset, ref[2] + offset, \
2 * decoder->stride, 8)
#define MOTION_DMV_444(table, ref, motion_x, motion_y) \
pos_x = 2 * decoder->offset + motion_x; \
pos_y = decoder->v_offset + motion_y; \
\
if (unlikely (pos_x > decoder->limit_x)) \
{ \
pos_x = ((int)pos_x < 0) ? 0 : decoder->limit_x; \
motion_x = pos_x - 2 * decoder->offset; \
} \
\
if (unlikely (pos_y > decoder->limit_y)) \
{ \
pos_y = ((int)pos_y < 0) ? 0 : decoder->limit_y; \
motion_y = pos_y - decoder->v_offset; \
} \
\
xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
offset = (pos_x >> 1) + (pos_y & ~1) * decoder->stride; \
\
table[xy_half] (decoder->dest[0] + decoder->offset, \
ref[0] + offset, 2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[0] + decoder->stride + decoder->offset, \
ref[0] + decoder->stride + offset, \
2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[1] + decoder->offset, \
ref[1] + offset, 2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[1] + decoder->stride + decoder->offset, \
ref[1] + decoder->stride + offset, \
2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[2] + decoder->offset, \
ref[2] + offset, 2 * decoder->stride, 8); \
table[xy_half] (decoder->dest[2] + decoder->stride + decoder->offset, \
ref[2] + decoder->stride + offset, \
2 * decoder->stride, 8)
#define MOTION_ZERO_444(table, ref) \
offset = decoder->offset + decoder->v_offset * decoder->stride; \
\
table[0] (decoder->dest[0] + decoder->offset, \
ref[0] + offset, decoder->stride, 16); \
table[4] (decoder->dest[1] + decoder->offset, \
ref[1] + offset, decoder->stride, 16); \
table[4] (decoder->dest[2] + (decoder->offset >> 1), \
ref[2] + offset, decoder->stride, 16)
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
static void motion_mp1 (mpeg2_decoder_t * const decoder,
motion_t * const motion,
mpeg2_mc_fct * const * const table)
{
int motion_x, motion_y;
unsigned int pos_x, pos_y, xy_half, offset;
NEEDBITS (bit_buf, bits, bit_ptr);
motion_x = motion->pmv[0][0] +
(get_motion_delta (decoder,
motion->f_code[0]) << motion->f_code[1]);
motion_x = bound_motion_vector (motion_x,
motion->f_code[0] + motion->f_code[1]);
motion->pmv[0][0] = motion_x;
NEEDBITS (bit_buf, bits, bit_ptr);
motion_y = motion->pmv[0][1] +
(get_motion_delta (decoder,
motion->f_code[0]) << motion->f_code[1]);
motion_y = bound_motion_vector (motion_y,
motion->f_code[0] + motion->f_code[1]);
motion->pmv[0][1] = motion_y;
MOTION_420 (table, motion->ref[0], motion_x, motion_y, 16, 0);
}
#define MOTION_FUNCTIONS(FORMAT, MOTION, MOTION_FIELD, \
MOTION_DMV, MOTION_ZERO) \
\
static void motion_fr_frame_##FORMAT (mpeg2_decoder_t * const decoder, \
motion_t * const motion, \
mpeg2_mc_fct * const * const table) \
{ \
int motion_x, motion_y; \
unsigned int pos_x, pos_y, xy_half, offset; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_x = motion->pmv[0][0] + get_motion_delta (decoder, \
motion->f_code[0]); \
motion_x = bound_motion_vector (motion_x, motion->f_code[0]); \
motion->pmv[1][0] = motion->pmv[0][0] = motion_x; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_y = motion->pmv[0][1] + get_motion_delta (decoder, \
motion->f_code[1]); \
motion_y = bound_motion_vector (motion_y, motion->f_code[1]); \
motion->pmv[1][1] = motion->pmv[0][1] = motion_y; \
\
MOTION (table, motion->ref[0], motion_x, motion_y, 16, 0); \
} \
\
static void motion_fr_field_##FORMAT (mpeg2_decoder_t * const decoder, \
motion_t * const motion, \
mpeg2_mc_fct * const * const table) \
{ \
int motion_x, motion_y, field; \
unsigned int pos_x, pos_y, xy_half, offset; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
field = UBITS (bit_buf, 1); \
DUMPBITS (bit_buf, bits, 1); \
\
motion_x = motion->pmv[0][0] + get_motion_delta (decoder, \
motion->f_code[0]); \
motion_x = bound_motion_vector (motion_x, motion->f_code[0]); \
motion->pmv[0][0] = motion_x; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_y = ((motion->pmv[0][1] >> 1) + \
get_motion_delta (decoder, motion->f_code[1])); \
/* motion_y = bound_motion_vector (motion_y, motion->f_code[1]); */ \
motion->pmv[0][1] = motion_y << 1; \
\
MOTION_FIELD (table, motion->ref[0], motion_x, motion_y, 0, & ~1, field); \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
field = UBITS (bit_buf, 1); \
DUMPBITS (bit_buf, bits, 1); \
\
motion_x = motion->pmv[1][0] + get_motion_delta (decoder, \
motion->f_code[0]); \
motion_x = bound_motion_vector (motion_x, motion->f_code[0]); \
motion->pmv[1][0] = motion_x; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_y = ((motion->pmv[1][1] >> 1) + \
get_motion_delta (decoder, motion->f_code[1])); \
/* motion_y = bound_motion_vector (motion_y, motion->f_code[1]); */ \
motion->pmv[1][1] = motion_y << 1; \
\
MOTION_FIELD (table, motion->ref[0], motion_x, motion_y, 1, & ~1, field); \
} \
\
static void motion_fr_dmv_##FORMAT (mpeg2_decoder_t * const decoder, \
motion_t * const motion, \
mpeg2_mc_fct * const * const table) \
{ \
int motion_x, motion_y, dmv_x, dmv_y, m, other_x, other_y; \
unsigned int pos_x, pos_y, xy_half, offset; \
\
(void)table; \
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_x = motion->pmv[0][0] + get_motion_delta (decoder, \
motion->f_code[0]); \
motion_x = bound_motion_vector (motion_x, motion->f_code[0]); \
motion->pmv[1][0] = motion->pmv[0][0] = motion_x; \
NEEDBITS (bit_buf, bits, bit_ptr); \
dmv_x = get_dmv (decoder); \
\
motion_y = ((motion->pmv[0][1] >> 1) + \
get_motion_delta (decoder, motion->f_code[1])); \
/* motion_y = bound_motion_vector (motion_y, motion->f_code[1]); */ \
motion->pmv[1][1] = motion->pmv[0][1] = motion_y << 1; \
dmv_y = get_dmv (decoder); \
\
m = decoder->top_field_first ? 1 : 3; \
other_x = ((motion_x * m + (motion_x > 0)) >> 1) + dmv_x; \
other_y = ((motion_y * m + (motion_y > 0)) >> 1) + dmv_y - 1; \
MOTION_FIELD (mpeg2_mc.put, motion->ref[0], other_x, other_y, 0, | 1, 0); \
\
m = decoder->top_field_first ? 3 : 1; \
other_x = ((motion_x * m + (motion_x > 0)) >> 1) + dmv_x; \
other_y = ((motion_y * m + (motion_y > 0)) >> 1) + dmv_y + 1; \
MOTION_FIELD (mpeg2_mc.put, motion->ref[0], other_x, other_y, 1, & ~1, 0);\
\
MOTION_DMV (mpeg2_mc.avg, motion->ref[0], motion_x, motion_y); \
} \
\
static void motion_reuse_##FORMAT (mpeg2_decoder_t * const decoder, \
motion_t * const motion, \
mpeg2_mc_fct * const * const table) \
{ \
int motion_x, motion_y; \
unsigned int pos_x, pos_y, xy_half, offset; \
\
motion_x = motion->pmv[0][0]; \
motion_y = motion->pmv[0][1]; \
\
MOTION (table, motion->ref[0], motion_x, motion_y, 16, 0); \
} \
\
static void motion_zero_##FORMAT (mpeg2_decoder_t * const decoder, \
motion_t * const motion, \
mpeg2_mc_fct * const * const table) \
{ \
unsigned int offset; \
\
motion->pmv[0][0] = motion->pmv[0][1] = 0; \
motion->pmv[1][0] = motion->pmv[1][1] = 0; \
\
MOTION_ZERO (table, motion->ref[0]); \
} \
\
static void motion_fi_field_##FORMAT (mpeg2_decoder_t * const decoder, \
motion_t * const motion, \
mpeg2_mc_fct * const * const table) \
{ \
int motion_x, motion_y; \
uint8_t ** ref_field; \
unsigned int pos_x, pos_y, xy_half, offset; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
ref_field = motion->ref2[UBITS (bit_buf, 1)]; \
DUMPBITS (bit_buf, bits, 1); \
\
motion_x = motion->pmv[0][0] + get_motion_delta (decoder, \
motion->f_code[0]); \
motion_x = bound_motion_vector (motion_x, motion->f_code[0]); \
motion->pmv[1][0] = motion->pmv[0][0] = motion_x; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_y = motion->pmv[0][1] + get_motion_delta (decoder, \
motion->f_code[1]); \
motion_y = bound_motion_vector (motion_y, motion->f_code[1]); \
motion->pmv[1][1] = motion->pmv[0][1] = motion_y; \
\
MOTION (table, ref_field, motion_x, motion_y, 16, 0); \
} \
\
static void motion_fi_16x8_##FORMAT (mpeg2_decoder_t * const decoder, \
motion_t * const motion, \
mpeg2_mc_fct * const * const table) \
{ \
int motion_x, motion_y; \
uint8_t ** ref_field; \
unsigned int pos_x, pos_y, xy_half, offset; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
ref_field = motion->ref2[UBITS (bit_buf, 1)]; \
DUMPBITS (bit_buf, bits, 1); \
\
motion_x = motion->pmv[0][0] + get_motion_delta (decoder, \
motion->f_code[0]); \
motion_x = bound_motion_vector (motion_x, motion->f_code[0]); \
motion->pmv[0][0] = motion_x; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_y = motion->pmv[0][1] + get_motion_delta (decoder, \
motion->f_code[1]); \
motion_y = bound_motion_vector (motion_y, motion->f_code[1]); \
motion->pmv[0][1] = motion_y; \
\
MOTION (table, ref_field, motion_x, motion_y, 8, 0); \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
ref_field = motion->ref2[UBITS (bit_buf, 1)]; \
DUMPBITS (bit_buf, bits, 1); \
\
motion_x = motion->pmv[1][0] + get_motion_delta (decoder, \
motion->f_code[0]); \
motion_x = bound_motion_vector (motion_x, motion->f_code[0]); \
motion->pmv[1][0] = motion_x; \
\
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_y = motion->pmv[1][1] + get_motion_delta (decoder, \
motion->f_code[1]); \
motion_y = bound_motion_vector (motion_y, motion->f_code[1]); \
motion->pmv[1][1] = motion_y; \
\
MOTION (table, ref_field, motion_x, motion_y, 8, 8); \
} \
\
static void motion_fi_dmv_##FORMAT (mpeg2_decoder_t * const decoder, \
motion_t * const motion, \
mpeg2_mc_fct * const * const table) \
{ \
int motion_x, motion_y, other_x, other_y; \
unsigned int pos_x, pos_y, xy_half, offset; \
\
(void)table; \
NEEDBITS (bit_buf, bits, bit_ptr); \
motion_x = motion->pmv[0][0] + get_motion_delta (decoder, \
motion->f_code[0]); \
motion_x = bound_motion_vector (motion_x, motion->f_code[0]); \
motion->pmv[1][0] = motion->pmv[0][0] = motion_x; \
NEEDBITS (bit_buf, bits, bit_ptr); \
other_x = ((motion_x + (motion_x > 0)) >> 1) + get_dmv (decoder); \
\
motion_y = motion->pmv[0][1] + get_motion_delta (decoder, \
motion->f_code[1]); \
motion_y = bound_motion_vector (motion_y, motion->f_code[1]); \
motion->pmv[1][1] = motion->pmv[0][1] = motion_y; \
other_y = (((motion_y + (motion_y > 0)) >> 1) + get_dmv (decoder) + \
decoder->dmv_offset); \
\
MOTION (mpeg2_mc.put, motion->ref[0], motion_x, motion_y, 16, 0); \
MOTION (mpeg2_mc.avg, motion->ref[1], other_x, other_y, 16, 0); \
} \
MOTION_FUNCTIONS (420, MOTION_420, MOTION_FIELD_420, MOTION_DMV_420,
MOTION_ZERO_420)
MOTION_FUNCTIONS (422, MOTION_422, MOTION_FIELD_422, MOTION_DMV_422,
MOTION_ZERO_422)
MOTION_FUNCTIONS (444, MOTION_444, MOTION_FIELD_444, MOTION_DMV_444,
MOTION_ZERO_444)
/* like motion_frame, but parsing without actual motion compensation */
static void motion_fr_conceal (mpeg2_decoder_t * const decoder)
{
int tmp;
NEEDBITS (bit_buf, bits, bit_ptr);
tmp = (decoder->f_motion.pmv[0][0] +
get_motion_delta (decoder, decoder->f_motion.f_code[0]));
tmp = bound_motion_vector (tmp, decoder->f_motion.f_code[0]);
decoder->f_motion.pmv[1][0] = decoder->f_motion.pmv[0][0] = tmp;
NEEDBITS (bit_buf, bits, bit_ptr);
tmp = (decoder->f_motion.pmv[0][1] +
get_motion_delta (decoder, decoder->f_motion.f_code[1]));
tmp = bound_motion_vector (tmp, decoder->f_motion.f_code[1]);
decoder->f_motion.pmv[1][1] = decoder->f_motion.pmv[0][1] = tmp;
DUMPBITS (bit_buf, bits, 1); /* remove marker_bit */
}
static void motion_fi_conceal (mpeg2_decoder_t * const decoder)
{
int tmp;
NEEDBITS (bit_buf, bits, bit_ptr);
DUMPBITS (bit_buf, bits, 1); /* remove field_select */
tmp = decoder->f_motion.pmv[0][0] +
get_motion_delta (decoder, decoder->f_motion.f_code[0]);
tmp = bound_motion_vector (tmp, decoder->f_motion.f_code[0]);
decoder->f_motion.pmv[1][0] =
decoder->f_motion.pmv[0][0] = tmp;
NEEDBITS (bit_buf, bits, bit_ptr);
tmp = (decoder->f_motion.pmv[0][1] +
get_motion_delta (decoder, decoder->f_motion.f_code[1]));
tmp = bound_motion_vector (tmp, decoder->f_motion.f_code[1]);
decoder->f_motion.pmv[1][1] =
decoder->f_motion.pmv[0][1] = tmp;
DUMPBITS (bit_buf, bits, 1); /* remove marker_bit */
}
#undef bit_buf
#undef bits
#undef bit_ptr
#define MOTION_CALL(routine, direction) \
do { \
if ((direction) & MACROBLOCK_MOTION_FORWARD) \
routine (decoder, &decoder->f_motion, mpeg2_mc.put); \
\
if ((direction) & MACROBLOCK_MOTION_BACKWARD) \
{ \
routine (decoder, &decoder->b_motion, \
((direction) & MACROBLOCK_MOTION_FORWARD ? \
mpeg2_mc.avg : mpeg2_mc.put)); \
} \
} while (0)
#define NEXT_MACROBLOCK \
do { \
decoder->offset += 16; \
\
if (decoder->offset == decoder->width) \
{ \
do { /* just so we can use the break statement */ \
if (decoder->convert) \
{ \
decoder->convert (decoder->convert_id, decoder->dest, \
decoder->v_offset); \
if (decoder->coding_type == B_TYPE) \
break; \
} \
\
decoder->dest[0] += decoder->slice_stride; \
decoder->dest[1] += decoder->slice_uv_stride; \
decoder->dest[2] += decoder->slice_uv_stride; \
} while (0); \
\
decoder->v_offset += 16; \
\
if (decoder->v_offset > decoder->limit_y) \
return; \
\
decoder->offset = 0; \
} \
} while (0)
void mpeg2_init_fbuf (mpeg2_decoder_t * decoder, uint8_t * current_fbuf[3],
uint8_t * forward_fbuf[3], uint8_t * backward_fbuf[3])
{
int offset, stride, height, bottom_field;
stride = decoder->stride_frame;
bottom_field = (decoder->picture_structure == BOTTOM_FIELD);
offset = bottom_field ? stride : 0;
height = decoder->height;
decoder->picture_dest[0] = current_fbuf[0] + offset;
decoder->picture_dest[1] = current_fbuf[1] + (offset >> 1);
decoder->picture_dest[2] = current_fbuf[2] + (offset >> 1);
decoder->f_motion.ref[0][0] = forward_fbuf[0] + offset;
decoder->f_motion.ref[0][1] = forward_fbuf[1] + (offset >> 1);
decoder->f_motion.ref[0][2] = forward_fbuf[2] + (offset >> 1);
decoder->b_motion.ref[0][0] = backward_fbuf[0] + offset;
decoder->b_motion.ref[0][1] = backward_fbuf[1] + (offset >> 1);
decoder->b_motion.ref[0][2] = backward_fbuf[2] + (offset >> 1);
if (decoder->picture_structure != FRAME_PICTURE)
{
decoder->dmv_offset = bottom_field ? 1 : -1;
decoder->f_motion.ref2[0] = decoder->f_motion.ref[bottom_field];
decoder->f_motion.ref2[1] = decoder->f_motion.ref[!bottom_field];
decoder->b_motion.ref2[0] = decoder->b_motion.ref[bottom_field];
decoder->b_motion.ref2[1] = decoder->b_motion.ref[!bottom_field];
offset = stride - offset;
if (decoder->second_field && (decoder->coding_type != B_TYPE))
forward_fbuf = current_fbuf;
decoder->f_motion.ref[1][0] = forward_fbuf[0] + offset;
decoder->f_motion.ref[1][1] = forward_fbuf[1] + (offset >> 1);
decoder->f_motion.ref[1][2] = forward_fbuf[2] + (offset >> 1);
decoder->b_motion.ref[1][0] = backward_fbuf[0] + offset;
decoder->b_motion.ref[1][1] = backward_fbuf[1] + (offset >> 1);
decoder->b_motion.ref[1][2] = backward_fbuf[2] + (offset >> 1);
stride <<= 1;
height >>= 1;
}
decoder->stride = stride;
decoder->uv_stride = stride >> 1;
decoder->slice_stride = 16 * stride;
decoder->slice_uv_stride =
decoder->slice_stride >> (2 - decoder->chroma_format);
decoder->limit_x = 2 * decoder->width - 32;
decoder->limit_y_16 = 2 * height - 32;
decoder->limit_y_8 = 2 * height - 16;
decoder->limit_y = height - 16;
if (decoder->mpeg1)
{
decoder->motion_parser[0] = motion_zero_420;
decoder->motion_parser[MC_FRAME] = motion_mp1;
decoder->motion_parser[4] = motion_reuse_420;
}
else if (decoder->picture_structure == FRAME_PICTURE)
{
if (decoder->chroma_format == 0)
{
decoder->motion_parser[0] = motion_zero_420;
decoder->motion_parser[MC_FIELD] = motion_fr_field_420;
decoder->motion_parser[MC_FRAME] = motion_fr_frame_420;
decoder->motion_parser[MC_DMV] = motion_fr_dmv_420;
decoder->motion_parser[4] = motion_reuse_420;
}
else if (decoder->chroma_format == 1)
{
decoder->motion_parser[0] = motion_zero_422;
decoder->motion_parser[MC_FIELD] = motion_fr_field_422;
decoder->motion_parser[MC_FRAME] = motion_fr_frame_422;
decoder->motion_parser[MC_DMV] = motion_fr_dmv_422;
decoder->motion_parser[4] = motion_reuse_422;
}
else
{
decoder->motion_parser[0] = motion_zero_444;
decoder->motion_parser[MC_FIELD] = motion_fr_field_444;
decoder->motion_parser[MC_FRAME] = motion_fr_frame_444;
decoder->motion_parser[MC_DMV] = motion_fr_dmv_444;
decoder->motion_parser[4] = motion_reuse_444;
}
}
else
{
if (decoder->chroma_format == 0)
{
decoder->motion_parser[0] = motion_zero_420;
decoder->motion_parser[MC_FIELD] = motion_fi_field_420;
decoder->motion_parser[MC_16X8] = motion_fi_16x8_420;
decoder->motion_parser[MC_DMV] = motion_fi_dmv_420;
decoder->motion_parser[4] = motion_reuse_420;
}
else if (decoder->chroma_format == 1)
{
decoder->motion_parser[0] = motion_zero_422;
decoder->motion_parser[MC_FIELD] = motion_fi_field_422;
decoder->motion_parser[MC_16X8] = motion_fi_16x8_422;
decoder->motion_parser[MC_DMV] = motion_fi_dmv_422;
decoder->motion_parser[4] = motion_reuse_422;
}
else
{
decoder->motion_parser[0] = motion_zero_444;
decoder->motion_parser[MC_FIELD] = motion_fi_field_444;
decoder->motion_parser[MC_16X8] = motion_fi_16x8_444;
decoder->motion_parser[MC_DMV] = motion_fi_dmv_444;
decoder->motion_parser[4] = motion_reuse_444;
}
}
}
static inline int slice_init (mpeg2_decoder_t * const decoder, int code)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
int offset;
const MBAtab * mba;
decoder->dc_dct_pred[0] = decoder->dc_dct_pred[1] =
decoder->dc_dct_pred[2] = 16384;
decoder->f_motion.pmv[0][0] = decoder->f_motion.pmv[0][1] = 0;
decoder->f_motion.pmv[1][0] = decoder->f_motion.pmv[1][1] = 0;
decoder->b_motion.pmv[0][0] = decoder->b_motion.pmv[0][1] = 0;
decoder->b_motion.pmv[1][0] = decoder->b_motion.pmv[1][1] = 0;
if (decoder->vertical_position_extension)
{
code += UBITS (bit_buf, 3) << 7;
DUMPBITS (bit_buf, bits, 3);
}
decoder->v_offset = (code - 1) * 16;
offset = 0;
if (!(decoder->convert) || decoder->coding_type != B_TYPE)
{
offset = (code - 1) * decoder->slice_stride;
}
decoder->dest[0] = decoder->picture_dest[0] + offset;
offset >>= (2 - decoder->chroma_format);
decoder->dest[1] = decoder->picture_dest[1] + offset;
decoder->dest[2] = decoder->picture_dest[2] + offset;
get_quantizer_scale (decoder);
/* ignore intra_slice and all the extra data */
while (bit_buf & 0x80000000)
{
DUMPBITS (bit_buf, bits, 9);
NEEDBITS (bit_buf, bits, bit_ptr);
}
/* decode initial macroblock address increment */
offset = 0;
while (1)
{
if (bit_buf >= 0x08000000)
{
mba = MBA_5 + (UBITS (bit_buf, 6) - 2);
break;
}
else if (bit_buf >= 0x01800000)
{
mba = MBA_11 + (UBITS (bit_buf, 12) - 24);
break;
}
else
{
switch (UBITS (bit_buf, 12))
{
case 8: /* macroblock_escape */
offset += 33;
DUMPBITS (bit_buf, bits, 11);
NEEDBITS (bit_buf, bits, bit_ptr);
continue;
case 15: /* macroblock_stuffing (MPEG1 only) */
bit_buf &= 0xfffff;
DUMPBITS (bit_buf, bits, 11);
NEEDBITS (bit_buf, bits, bit_ptr);
continue;
default: /* error */
return 1;
}
}
}
DUMPBITS (bit_buf, bits, mba->len + 1);
decoder->offset = (offset + mba->mba) << 4;
while (decoder->offset - decoder->width >= 0)
{
decoder->offset -= decoder->width;
if (!(decoder->convert) || decoder->coding_type != B_TYPE)
{
decoder->dest[0] += decoder->slice_stride;
decoder->dest[1] += decoder->slice_uv_stride;
decoder->dest[2] += decoder->slice_uv_stride;
}
decoder->v_offset += 16;
}
if (decoder->v_offset > decoder->limit_y)
return 1;
return 0;
#undef bit_buf
#undef bits
#undef bit_ptr
}
void mpeg2_slice (mpeg2_decoder_t * const decoder, const int code,
const uint8_t * const buffer)
{
#define bit_buf (decoder->bitstream_buf)
#define bits (decoder->bitstream_bits)
#define bit_ptr (decoder->bitstream_ptr)
bitstream_init (decoder, buffer);
if (slice_init (decoder, code))
return;
while (1)
{
int macroblock_modes;
int mba_inc;
const MBAtab * mba;
NEEDBITS (bit_buf, bits, bit_ptr);
macroblock_modes = get_macroblock_modes (decoder);
/* maybe integrate MACROBLOCK_QUANT test into get_macroblock_modes ? */
if (macroblock_modes & MACROBLOCK_QUANT)
get_quantizer_scale (decoder);
if (macroblock_modes & MACROBLOCK_INTRA)
{
int DCT_offset, DCT_stride;
int offset;
uint8_t * dest_y;
if (decoder->concealment_motion_vectors)
{
if (decoder->picture_structure == FRAME_PICTURE)
motion_fr_conceal (decoder);
else
motion_fi_conceal (decoder);
}
else
{
decoder->f_motion.pmv[0][0] = decoder->f_motion.pmv[0][1] = 0;
decoder->f_motion.pmv[1][0] = decoder->f_motion.pmv[1][1] = 0;
decoder->b_motion.pmv[0][0] = decoder->b_motion.pmv[0][1] = 0;
decoder->b_motion.pmv[1][0] = decoder->b_motion.pmv[1][1] = 0;
}
if (macroblock_modes & DCT_TYPE_INTERLACED)
{
DCT_offset = decoder->stride;
DCT_stride = decoder->stride * 2;
}
else
{
DCT_offset = decoder->stride * 8;
DCT_stride = decoder->stride;
}
offset = decoder->offset;
dest_y = decoder->dest[0] + offset;
slice_intra_DCT (decoder, 0, dest_y, DCT_stride);
slice_intra_DCT (decoder, 0, dest_y + 8, DCT_stride);
slice_intra_DCT (decoder, 0, dest_y + DCT_offset, DCT_stride);
slice_intra_DCT (decoder, 0, dest_y + DCT_offset + 8, DCT_stride);
if (likely (decoder->chroma_format == 0))
{
slice_intra_DCT (decoder, 1, decoder->dest[1] + (offset >> 1),
decoder->uv_stride);
slice_intra_DCT (decoder, 2, decoder->dest[2] + (offset >> 1),
decoder->uv_stride);
if (decoder->coding_type == D_TYPE)
{
NEEDBITS (bit_buf, bits, bit_ptr);
DUMPBITS (bit_buf, bits, 1);
}
}
else if (likely (decoder->chroma_format == 1))
{
uint8_t * dest_u = decoder->dest[1] + (offset >> 1);
uint8_t * dest_v = decoder->dest[2] + (offset >> 1);
DCT_stride >>= 1;
DCT_offset >>= 1;
slice_intra_DCT (decoder, 1, dest_u, DCT_stride);
slice_intra_DCT (decoder, 2, dest_v, DCT_stride);
slice_intra_DCT (decoder, 1, dest_u + DCT_offset, DCT_stride);
slice_intra_DCT (decoder, 2, dest_v + DCT_offset, DCT_stride);
}
else
{
uint8_t * dest_u = decoder->dest[1] + offset;
uint8_t * dest_v = decoder->dest[2] + offset;
slice_intra_DCT (decoder, 1, dest_u, DCT_stride);
slice_intra_DCT (decoder, 2, dest_v, DCT_stride);
slice_intra_DCT (decoder, 1, dest_u + DCT_offset, DCT_stride);
slice_intra_DCT (decoder, 2, dest_v + DCT_offset, DCT_stride);
slice_intra_DCT (decoder, 1, dest_u + 8, DCT_stride);
slice_intra_DCT (decoder, 2, dest_v + 8, DCT_stride);
slice_intra_DCT (decoder, 1, dest_u + DCT_offset + 8,
DCT_stride);
slice_intra_DCT (decoder, 2, dest_v + DCT_offset + 8,
DCT_stride);
}
}
else
{
motion_parser_t * parser;
parser =
decoder->motion_parser[macroblock_modes >> MOTION_TYPE_SHIFT];
MOTION_CALL (parser, macroblock_modes);
if (macroblock_modes & MACROBLOCK_PATTERN)
{
int coded_block_pattern;
int DCT_offset, DCT_stride;
if (macroblock_modes & DCT_TYPE_INTERLACED)
{
DCT_offset = decoder->stride;
DCT_stride = decoder->stride * 2;
}
else
{
DCT_offset = decoder->stride * 8;
DCT_stride = decoder->stride;
}
coded_block_pattern = get_coded_block_pattern (decoder);
if (likely (decoder->chroma_format == 0))
{
int offset = decoder->offset;
uint8_t * dest_y = decoder->dest[0] + offset;
if (coded_block_pattern & 1)
slice_non_intra_DCT (decoder, 0, dest_y, DCT_stride);
if (coded_block_pattern & 2)
slice_non_intra_DCT (decoder, 0, dest_y + 8,
DCT_stride);
if (coded_block_pattern & 4)
slice_non_intra_DCT (decoder, 0, dest_y + DCT_offset,
DCT_stride);
if (coded_block_pattern & 8)
slice_non_intra_DCT (decoder, 0,
dest_y + DCT_offset + 8,
DCT_stride);
if (coded_block_pattern & 16)
slice_non_intra_DCT (decoder, 1,
decoder->dest[1] + (offset >> 1),
decoder->uv_stride);
if (coded_block_pattern & 32)
slice_non_intra_DCT (decoder, 2,
decoder->dest[2] + (offset >> 1),
decoder->uv_stride);
}
else if (likely (decoder->chroma_format == 1))
{
int offset;
uint8_t * dest_y;
coded_block_pattern |= bit_buf & (3 << 30);
DUMPBITS (bit_buf, bits, 2);
offset = decoder->offset;
dest_y = decoder->dest[0] + offset;
if (coded_block_pattern & 1)
slice_non_intra_DCT (decoder, 0, dest_y, DCT_stride);
if (coded_block_pattern & 2)
slice_non_intra_DCT (decoder, 0, dest_y + 8,
DCT_stride);
if (coded_block_pattern & 4)
slice_non_intra_DCT (decoder, 0, dest_y + DCT_offset,
DCT_stride);
if (coded_block_pattern & 8)
slice_non_intra_DCT (decoder, 0,
dest_y + DCT_offset + 8,
DCT_stride);
DCT_stride >>= 1;
DCT_offset = (DCT_offset + offset) >> 1;
if (coded_block_pattern & 16)
slice_non_intra_DCT (decoder, 1,
decoder->dest[1] + (offset >> 1),
DCT_stride);
if (coded_block_pattern & 32)
slice_non_intra_DCT (decoder, 2,
decoder->dest[2] + (offset >> 1),
DCT_stride);
if (coded_block_pattern & (2 << 30))
slice_non_intra_DCT (decoder, 1,
decoder->dest[1] + DCT_offset,
DCT_stride);
if (coded_block_pattern & (1 << 30))
slice_non_intra_DCT (decoder, 2,
decoder->dest[2] + DCT_offset,
DCT_stride);
}
else
{
int offset;
uint8_t * dest_y, * dest_u, * dest_v;
coded_block_pattern |= bit_buf & (63 << 26);
DUMPBITS (bit_buf, bits, 6);
offset = decoder->offset;
dest_y = decoder->dest[0] + offset;
dest_u = decoder->dest[1] + offset;
dest_v = decoder->dest[2] + offset;
if (coded_block_pattern & 1)
slice_non_intra_DCT (decoder, 0, dest_y, DCT_stride);
if (coded_block_pattern & 2)
slice_non_intra_DCT (decoder, 0, dest_y + 8,
DCT_stride);
if (coded_block_pattern & 4)
slice_non_intra_DCT (decoder, 0, dest_y + DCT_offset,
DCT_stride);
if (coded_block_pattern & 8)
slice_non_intra_DCT (decoder, 0,
dest_y + DCT_offset + 8,
DCT_stride);
if (coded_block_pattern & 16)
slice_non_intra_DCT (decoder, 1, dest_u, DCT_stride);
if (coded_block_pattern & 32)
slice_non_intra_DCT (decoder, 2, dest_v, DCT_stride);
if (coded_block_pattern & (32 << 26))
slice_non_intra_DCT (decoder, 1, dest_u + DCT_offset,
DCT_stride);
if (coded_block_pattern & (16 << 26))
slice_non_intra_DCT (decoder, 2, dest_v + DCT_offset,
DCT_stride);
if (coded_block_pattern & (8 << 26))
slice_non_intra_DCT (decoder, 1, dest_u + 8,
DCT_stride);
if (coded_block_pattern & (4 << 26))
slice_non_intra_DCT (decoder, 2, dest_v + 8,
DCT_stride);
if (coded_block_pattern & (2 << 26))
slice_non_intra_DCT (decoder, 1,
dest_u + DCT_offset + 8,
DCT_stride);
if (coded_block_pattern & (1 << 26))
slice_non_intra_DCT (decoder, 2,
dest_v + DCT_offset + 8,
DCT_stride);
}
}
decoder->dc_dct_pred[0] = decoder->dc_dct_pred[1] =
decoder->dc_dct_pred[2] = 16384;
}
NEXT_MACROBLOCK;
NEEDBITS (bit_buf, bits, bit_ptr);
mba_inc = 0;
while (1)
{
if (bit_buf >= 0x10000000)
{
mba = MBA_5 + (UBITS (bit_buf, 5) - 2);
break;
}
else if (bit_buf >= 0x03000000)
{
mba = MBA_11 + (UBITS (bit_buf, 11) - 24);
break;
}
else
{
switch (UBITS (bit_buf, 11))
{
case 8: /* macroblock_escape */
mba_inc += 33;
/* pass through */
case 15: /* macroblock_stuffing (MPEG1 only) */
DUMPBITS (bit_buf, bits, 11);
NEEDBITS (bit_buf, bits, bit_ptr);
continue;
default: /* end of slice, or error */
return;
}
}
}
DUMPBITS (bit_buf, bits, mba->len);
mba_inc += mba->mba;
if (mba_inc)
{
decoder->dc_dct_pred[0] = decoder->dc_dct_pred[1] =
decoder->dc_dct_pred[2] = 16384;
if (decoder->coding_type == P_TYPE)
{
do
{
MOTION_CALL (decoder->motion_parser[0],
MACROBLOCK_MOTION_FORWARD);
NEXT_MACROBLOCK;
}
while (--mba_inc);
}
else
{
do
{
MOTION_CALL (decoder->motion_parser[4], macroblock_modes);
NEXT_MACROBLOCK;
}
while (--mba_inc);
}
}
}
#undef bit_buf
#undef bits
#undef bit_ptr
}
Reference in a new issue View git blame Copy permalink