/* * slice.c * Copyright (C) 2000-2002 Michel Lespinasse * Copyright (C) 1999-2000 Aaron Holtzman * * 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 #include "mpeg2.h" #include "mpeg2_internal.h" #include "attributes.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 int non_linear_quantizer_scale [] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 32, 36, 40, 44, 48, 52, 56, 64, 72, 80, 88, 96, 104, 112 }; static inline int get_macroblock_modes (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_BASE; DUMPBITS (bit_buf, bits, 2); } return macroblock_modes; } else if (decoder->frame_pred_frame_dct) { if (macroblock_modes & MACROBLOCK_MOTION_FORWARD) macroblock_modes |= MC_FRAME; return macroblock_modes; } else { if (macroblock_modes & MACROBLOCK_MOTION_FORWARD) { macroblock_modes |= UBITS (bit_buf, 2) * MOTION_TYPE_BASE; 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; } 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_BASE; DUMPBITS (bit_buf, bits, 2); } return macroblock_modes; } else if (decoder->frame_pred_frame_dct) { /* if (! (macroblock_modes & MACROBLOCK_INTRA)) */ macroblock_modes |= MC_FRAME; return macroblock_modes; } else { if (macroblock_modes & MACROBLOCK_INTRA) goto intra; macroblock_modes |= UBITS (bit_buf, 2) * MOTION_TYPE_BASE; 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 int get_quantizer_scale (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); if (decoder->q_scale_type) return non_linear_quantizer_scale [quantizer_scale_code]; else return quantizer_scale_code << 1; #undef bit_buf #undef bits #undef bit_ptr } static inline int get_motion_delta (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) { #if 0 unsigned int limit; int sign; limit = 16 << f_code; if ((unsigned int)(vector + limit) < 2 * limit) return vector; else { sign = ((int32_t)vector) >> 31; return vector - ((2 * limit) ^ sign) + sign; } #else return ((int32_t)vector << (27 - f_code)) >> (27 - f_code); #endif } static inline int get_dmv (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 (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 (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; } 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; } #undef bit_buf #undef bits #undef bit_ptr } static inline int get_chroma_dc_dct_diff (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; } 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; } #undef bit_buf #undef bits #undef bit_ptr } #define SATURATE(val) \ do { \ if (unlikely ((uint32_t)(val + 2048) > 4095)) \ val = SBITS (val, 1) ^ 2047; \ } while (0) static void get_intra_block_B14 (decoder_t * const decoder) { int i; int j; int val; const uint8_t * scan = decoder->scan; const uint8_t * quant_matrix = decoder->intra_quantizer_matrix; int quantizer_scale = decoder->quantizer_scale; int mismatch; const DCTtab * tab; uint32_t bit_buf; int bits; const uint8_t * bit_ptr; int16_t * dest; 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 * quantizer_scale * 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) * quantizer_scale * 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 & 1; 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 (decoder_t * const decoder) { int i; int j; int val; const uint8_t * scan = decoder->scan; const uint8_t * quant_matrix = decoder->intra_quantizer_matrix; int quantizer_scale = decoder->quantizer_scale; int mismatch; const DCTtab * tab; uint32_t bit_buf; int bits; const uint8_t * bit_ptr; int16_t * dest; 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 * quantizer_scale * 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) * quantizer_scale * 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 & 1; 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 (decoder_t * const decoder) { int i; int j; int val; const uint8_t * scan = decoder->scan; const uint8_t * quant_matrix = decoder->non_intra_quantizer_matrix; int quantizer_scale = decoder->quantizer_scale; int mismatch; const DCTtab * tab; uint32_t bit_buf; int bits; const uint8_t * bit_ptr; int16_t * dest; i = -1; mismatch = 1; dest = decoder->DCTblock; 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) * quantizer_scale * 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 * quantizer_scale * 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 & 1; 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 (decoder_t * const decoder) { int i; int j; int val; const uint8_t * scan = decoder->scan; const uint8_t * quant_matrix = decoder->intra_quantizer_matrix; int quantizer_scale = decoder->quantizer_scale; const DCTtab * tab; uint32_t bit_buf; int bits; const uint8_t * bit_ptr; int16_t * dest; i = 0; dest = decoder->DCTblock; 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 * quantizer_scale * 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 * quantizer_scale * 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 (decoder_t * const decoder) { int i; int j; int val; const uint8_t * scan = decoder->scan; const uint8_t * quant_matrix = decoder->non_intra_quantizer_matrix; int quantizer_scale = decoder->quantizer_scale; const DCTtab * tab; uint32_t bit_buf; int bits; const uint8_t * bit_ptr; int16_t * dest; i = -1; dest = decoder->DCTblock; 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) * quantizer_scale * 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 * quantizer_scale * 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 (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); else decoder->dc_dct_pred[cc] += get_chroma_dc_dct_diff (decoder); decoder->DCTblock[0] = decoder->dc_dct_pred[cc] << (3 - decoder->intra_dc_precision); 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); else get_intra_block_B14 (decoder); mpeg2_idct_copy (decoder->DCTblock, dest, stride); #undef bit_buf #undef bits #undef bit_ptr } static inline void slice_non_intra_DCT (decoder_t * const decoder, 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); mpeg2_idct_add (last, decoder->DCTblock, dest, stride); } #define MOTION(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 ((pos_x > decoder->limit_x) || (pos_y > decoder->limit_y_ ## size)) \ return; \ 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(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 ((pos_x > decoder->limit_x) || (pos_y > decoder->limit_y)) \ return; \ 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) static void motion_mp1 (decoder_t * const decoder, motion_t * const motion, mpeg2_mc_fct * const * const table) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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 (table, motion->ref[0], motion_x, motion_y, 16, 0); #undef bit_buf #undef bits #undef bit_ptr } static void motion_fr_frame (decoder_t * const decoder, motion_t * const motion, mpeg2_mc_fct * const * const table) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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); #undef bit_buf #undef bits #undef bit_ptr } static void motion_fr_field (decoder_t * const decoder, motion_t * const motion, mpeg2_mc_fct * const * const table) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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); #undef bit_buf #undef bits #undef bit_ptr } static void motion_fr_dmv (decoder_t * const decoder, motion_t * const motion, mpeg2_mc_fct * const * const table) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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); xy_half = ((motion_y & 1) << 1) | (motion_x & 1); offset = (decoder->offset + (motion_x >> 1) + (decoder->v_offset + (motion_y & ~1)) * decoder->stride); mpeg2_mc.avg[xy_half] (decoder->dest[0] + decoder->offset, motion->ref[0][0] + offset, 2 * decoder->stride, 8); mpeg2_mc.avg[xy_half] (decoder->dest[0] + decoder->stride + decoder->offset, motion->ref[0][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)); mpeg2_mc.avg[4+xy_half] (decoder->dest[1] + (decoder->offset >> 1), motion->ref[0][1] + offset, 2 * decoder->uv_stride, 4); mpeg2_mc.avg[4+xy_half] (decoder->dest[1] + decoder->uv_stride + (decoder->offset >> 1), motion->ref[0][1] + decoder->uv_stride + offset, 2 * decoder->uv_stride, 4); mpeg2_mc.avg[4+xy_half] (decoder->dest[2] + (decoder->offset >> 1), motion->ref[0][2] + offset, 2 * decoder->uv_stride, 4); mpeg2_mc.avg[4+xy_half] (decoder->dest[2] + decoder->uv_stride + (decoder->offset >> 1), motion->ref[0][2] + decoder->uv_stride + offset, 2 * decoder->uv_stride, 4); #undef bit_buf #undef bits #undef bit_ptr } static inline void motion_reuse (const decoder_t * const decoder, const 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 inline void motion_zero (const decoder_t * const decoder, const motion_t * const motion, mpeg2_mc_fct * const * const table) { unsigned int offset; table[0] (decoder->dest[0] + decoder->offset, (motion->ref[0][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), motion->ref[0][1] + offset, decoder->uv_stride, 8); table[4] (decoder->dest[2] + (decoder->offset >> 1), motion->ref[0][2] + offset, decoder->uv_stride, 8); } /* like motion_frame, but parsing without actual motion compensation */ static void motion_fr_conceal (decoder_t * const decoder) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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 */ #undef bit_buf #undef bits #undef bit_ptr } static void motion_fi_field (decoder_t * const decoder, motion_t * const motion, mpeg2_mc_fct * const * const table) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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); #undef bit_buf #undef bits #undef bit_ptr } static void motion_fi_16x8 (decoder_t * const decoder, motion_t * const motion, mpeg2_mc_fct * const * const table) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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); #undef bit_buf #undef bits #undef bit_ptr } static void motion_fi_dmv (decoder_t * const decoder, motion_t * const motion, mpeg2_mc_fct * const * const table) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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); #undef bit_buf #undef bits #undef bit_ptr } static void motion_fi_conceal (decoder_t * const decoder) { #define bit_buf (decoder->bitstream_buf) #define bits (decoder->bitstream_bits) #define bit_ptr (decoder->bitstream_ptr) 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 { \ if(decoder->quant_store) \ decoder->quant_store[decoder->quant_stride*(decoder->v_offset>>4) \ +(decoder->offset>>4)] = decoder->quantizer_scale; \ decoder->offset += 16; \ if (decoder->offset == decoder->width) { \ do { /* just so we can use the break statement */ \ if (decoder->convert) { \ decoder->convert (decoder->fbuf_id, decoder->dest, \ decoder->v_offset); \ if (decoder->coding_type == B_TYPE) \ break; \ } \ decoder->dest[0] += 16 * decoder->stride; \ decoder->dest[1] += 4 * decoder->stride; \ decoder->dest[2] += 4 * decoder->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) void mpeg2_init_fbuf (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->width; 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->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; } static inline int slice_init (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] = 128 << decoder->intra_dc_precision; 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->stride * 4; decoder->dest[0] = decoder->picture_dest[0] + offset * 4; decoder->dest[1] = decoder->picture_dest[1] + offset; decoder->dest[2] = decoder->picture_dest[2] + offset; decoder->quantizer_scale = 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] += 16 * decoder->stride; decoder->dest[1] += 4 * decoder->stride; decoder->dest[2] += 4 * decoder->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 (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) decoder->quantizer_scale = 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); 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 (decoder->picture_structure == FRAME_PICTURE) switch (macroblock_modes & MOTION_TYPE_MASK) { case MC_FRAME: if (decoder->mpeg1) MOTION_CALL (motion_mp1, macroblock_modes); else MOTION_CALL (motion_fr_frame, macroblock_modes); break; case MC_FIELD: MOTION_CALL (motion_fr_field, macroblock_modes); break; case MC_DMV: MOTION_CALL (motion_fr_dmv, MACROBLOCK_MOTION_FORWARD); break; case 0: /* non-intra mb without forward mv in a P picture */ decoder->f_motion.pmv[0][0] = 0; decoder->f_motion.pmv[0][1] = 0; decoder->f_motion.pmv[1][0] = 0; decoder->f_motion.pmv[1][1] = 0; MOTION_CALL (motion_zero, MACROBLOCK_MOTION_FORWARD); break; } else switch (macroblock_modes & MOTION_TYPE_MASK) { case MC_FIELD: MOTION_CALL (motion_fi_field, macroblock_modes); break; case MC_16X8: MOTION_CALL (motion_fi_16x8, macroblock_modes); break; case MC_DMV: MOTION_CALL (motion_fi_dmv, MACROBLOCK_MOTION_FORWARD); break; case 0: /* non-intra mb without forward mv in a P picture */ decoder->f_motion.pmv[0][0] = 0; decoder->f_motion.pmv[0][1] = 0; decoder->f_motion.pmv[1][0] = 0; decoder->f_motion.pmv[1][1] = 0; MOTION_CALL (motion_zero, MACROBLOCK_MOTION_FORWARD); break; } if (macroblock_modes & MACROBLOCK_PATTERN) { int coded_block_pattern; int DCT_offset, DCT_stride; int offset; uint8_t * dest_y; 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); offset = decoder->offset; dest_y = decoder->dest[0] + offset; if (coded_block_pattern & 0x20) slice_non_intra_DCT (decoder, dest_y, DCT_stride); if (coded_block_pattern & 0x10) slice_non_intra_DCT (decoder, dest_y + 8, DCT_stride); if (coded_block_pattern & 0x08) slice_non_intra_DCT (decoder, dest_y + DCT_offset, DCT_stride); if (coded_block_pattern & 0x04) slice_non_intra_DCT (decoder, dest_y + DCT_offset + 8, DCT_stride); if (coded_block_pattern & 0x2) slice_non_intra_DCT (decoder, decoder->dest[1] + (offset >> 1), decoder->uv_stride); if (coded_block_pattern & 0x1) slice_non_intra_DCT (decoder, decoder->dest[2] + (offset >> 1), decoder->uv_stride); } decoder->dc_dct_pred[0] = decoder->dc_dct_pred[1] = decoder->dc_dct_pred[2] = 128 << decoder->intra_dc_precision; } 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] = 128 << decoder->intra_dc_precision; if (decoder->coding_type == P_TYPE) { 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; do { MOTION_CALL (motion_zero, MACROBLOCK_MOTION_FORWARD); NEXT_MACROBLOCK; } while (--mba_inc); } else { do { MOTION_CALL (motion_reuse, macroblock_modes); NEXT_MACROBLOCK; } while (--mba_inc); } } } #undef bit_buf #undef bits #undef bit_ptr }