diff options
Diffstat (limited to 'libmpeg2/slice.c')
| -rw-r--r-- | libmpeg2/slice.c | 2078 |
1 files changed, 2078 insertions, 0 deletions
diff --git a/libmpeg2/slice.c b/libmpeg2/slice.c new file mode 100644 index 0000000..99ba205 --- /dev/null +++ b/libmpeg2/slice.c @@ -0,0 +1,2078 @@ +/* + * 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 "config.h" + +#include <inttypes.h> + +#include "mpeg2.h" +#include "attributes.h" +#include "mpeg2_internal.h" + +extern mpeg2_mc_t mpeg2_mc; +extern void (* mpeg2_idct_copy) (int16_t * block, uint8_t * dest, int stride); +extern void (* mpeg2_idct_add) (int last, int16_t * block, + uint8_t * dest, int stride); +extern void (* mpeg2_cpu_state_save) (cpu_state_t * state); +extern void (* mpeg2_cpu_state_restore) (cpu_state_t * state); + +#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, 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); + + 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 */ + /* 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) + 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, 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); + 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, 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); + + 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, 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); + 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, 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); + /* 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 + 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, \ + 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; \ + \ + 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; \ + \ + 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) { \ + if (mpeg2_cpu_state_restore) \ + mpeg2_cpu_state_restore (&cpu_state); \ + return; \ + } \ + decoder->offset = 0; \ + } \ +} while (0) + +/** + * Dummy motion decoding function, to avoid calling NULL in + * case of malformed streams. + */ +static void motion_dummy (mpeg2_decoder_t * const decoder, + motion_t * const motion, + mpeg2_mc_fct * const * const table) +{ +} + +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_FIELD] = motion_dummy; + decoder->motion_parser[MC_FRAME] = motion_mp1; + decoder->motion_parser[MC_DMV] = motion_dummy; + 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) + cpu_state_t cpu_state; + + bitstream_init (decoder, buffer); + + if (slice_init (decoder, code)) + return; + + if (mpeg2_cpu_state_save) + mpeg2_cpu_state_save (&cpu_state); + + 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; + + if ( ((macroblock_modes >> MOTION_TYPE_SHIFT) < 0) + || ((macroblock_modes >> MOTION_TYPE_SHIFT) >= + (int)(sizeof(decoder->motion_parser) + / sizeof(decoder->motion_parser[0]))) + ) { + break; // Illegal ! + } + + 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 */ + if (mpeg2_cpu_state_restore) + mpeg2_cpu_state_restore (&cpu_state); + 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 +} |