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789 lines
25 KiB
789 lines
25 KiB
/* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* @brief IntraX8 (J-Frame) subdecoder, used by WMV2 and VC-1 |
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*/ |
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#include "libavutil/avassert.h" |
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#include "avcodec.h" |
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#include "error_resilience.h" |
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#include "get_bits.h" |
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#include "mpegvideo.h" |
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#include "msmpeg4data.h" |
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#include "intrax8huf.h" |
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#include "intrax8.h" |
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#include "intrax8dsp.h" |
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#define MAX_TABLE_DEPTH(table_bits, max_bits) ((max_bits+table_bits-1)/table_bits) |
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#define DC_VLC_BITS 9 |
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#define AC_VLC_BITS 9 |
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#define OR_VLC_BITS 7 |
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#define DC_VLC_MTD MAX_TABLE_DEPTH(DC_VLC_BITS, MAX_DC_VLC_BITS) |
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#define AC_VLC_MTD MAX_TABLE_DEPTH(AC_VLC_BITS, MAX_AC_VLC_BITS) |
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#define OR_VLC_MTD MAX_TABLE_DEPTH(OR_VLC_BITS, MAX_OR_VLC_BITS) |
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static VLC j_ac_vlc[2][2][8]; //[quant<13],[intra/inter],[select] |
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static VLC j_dc_vlc[2][8]; //[quant], [select] |
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static VLC j_orient_vlc[2][4]; //[quant], [select] |
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static av_cold void x8_vlc_init(void){ |
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int i; |
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int offset = 0; |
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int sizeidx = 0; |
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static const uint16_t sizes[8*4 + 8*2 + 2 + 4] = { |
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576, 548, 582, 618, 546, 616, 560, 642, |
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584, 582, 704, 664, 512, 544, 656, 640, |
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512, 648, 582, 566, 532, 614, 596, 648, |
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586, 552, 584, 590, 544, 578, 584, 624, |
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528, 528, 526, 528, 536, 528, 526, 544, |
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544, 512, 512, 528, 528, 544, 512, 544, |
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128, 128, 128, 128, 128, 128}; |
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static VLC_TYPE table[28150][2]; |
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#define init_ac_vlc(dst,src) \ |
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dst.table = &table[offset]; \ |
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dst.table_allocated = sizes[sizeidx]; \ |
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offset += sizes[sizeidx++]; \ |
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init_vlc(&dst, \ |
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AC_VLC_BITS,77, \ |
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&src[1],4,2, \ |
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&src[0],4,2, \ |
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INIT_VLC_USE_NEW_STATIC) |
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//set ac tables |
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for(i=0;i<8;i++){ |
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init_ac_vlc( j_ac_vlc[0][0][i], x8_ac0_highquant_table[i][0] ); |
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init_ac_vlc( j_ac_vlc[0][1][i], x8_ac1_highquant_table[i][0] ); |
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init_ac_vlc( j_ac_vlc[1][0][i], x8_ac0_lowquant_table [i][0] ); |
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init_ac_vlc( j_ac_vlc[1][1][i], x8_ac1_lowquant_table [i][0] ); |
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} |
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#undef init_ac_vlc |
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//set dc tables |
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#define init_dc_vlc(dst,src) \ |
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dst.table = &table[offset]; \ |
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dst.table_allocated = sizes[sizeidx]; \ |
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offset += sizes[sizeidx++]; \ |
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init_vlc(&dst, \ |
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DC_VLC_BITS,34, \ |
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&src[1],4,2, \ |
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&src[0],4,2, \ |
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INIT_VLC_USE_NEW_STATIC); |
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for(i=0;i<8;i++){ |
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init_dc_vlc( j_dc_vlc[0][i], x8_dc_highquant_table[i][0]); |
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init_dc_vlc( j_dc_vlc[1][i], x8_dc_lowquant_table [i][0]); |
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} |
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#undef init_dc_vlc |
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//set orient tables |
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#define init_or_vlc(dst,src) \ |
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dst.table = &table[offset]; \ |
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dst.table_allocated = sizes[sizeidx]; \ |
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offset += sizes[sizeidx++]; \ |
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init_vlc(&dst, \ |
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OR_VLC_BITS,12, \ |
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&src[1],4,2, \ |
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&src[0],4,2, \ |
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INIT_VLC_USE_NEW_STATIC); |
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for(i=0;i<2;i++){ |
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init_or_vlc( j_orient_vlc[0][i], x8_orient_highquant_table[i][0]); |
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} |
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for(i=0;i<4;i++){ |
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init_or_vlc( j_orient_vlc[1][i], x8_orient_lowquant_table [i][0]) |
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} |
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if (offset != sizeof(table)/sizeof(VLC_TYPE)/2) |
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av_log(NULL, AV_LOG_ERROR, "table size %i does not match needed %i\n", (int)(sizeof(table)/sizeof(VLC_TYPE)/2), offset); |
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} |
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#undef init_or_vlc |
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static void x8_reset_vlc_tables(IntraX8Context * w){ |
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memset(w->j_dc_vlc,0,sizeof(w->j_dc_vlc)); |
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memset(w->j_ac_vlc,0,sizeof(w->j_ac_vlc)); |
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w->j_orient_vlc=NULL; |
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} |
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static inline void x8_select_ac_table(IntraX8Context * const w , int mode){ |
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MpegEncContext * const s= w->s; |
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int table_index; |
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av_assert2(mode<4); |
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if( w->j_ac_vlc[mode] ) return; |
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table_index = get_bits(&s->gb, 3); |
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w->j_ac_vlc[mode] = &j_ac_vlc[w->quant<13][mode>>1][table_index];//2 modes use same tables |
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av_assert2(w->j_ac_vlc[mode]); |
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} |
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static inline int x8_get_orient_vlc(IntraX8Context * w){ |
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MpegEncContext * const s= w->s; |
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int table_index; |
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if(!w->j_orient_vlc ){ |
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table_index = get_bits(&s->gb, 1+(w->quant<13) ); |
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w->j_orient_vlc = &j_orient_vlc[w->quant<13][table_index]; |
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} |
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return get_vlc2(&s->gb, w->j_orient_vlc->table, OR_VLC_BITS, OR_VLC_MTD); |
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} |
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#define extra_bits(eb) (eb) |
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#define extra_run (0xFF<<8) |
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#define extra_level (0x00<<8) |
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#define run_offset(r) ((r)<<16) |
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#define level_offset(l) ((l)<<24) |
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static const uint32_t ac_decode_table[]={ |
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/*46*/ extra_bits(3) | extra_run | run_offset(16) | level_offset( 0), |
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/*47*/ extra_bits(3) | extra_run | run_offset(24) | level_offset( 0), |
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/*48*/ extra_bits(2) | extra_run | run_offset( 4) | level_offset( 1), |
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/*49*/ extra_bits(3) | extra_run | run_offset( 8) | level_offset( 1), |
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/*50*/ extra_bits(5) | extra_run | run_offset(32) | level_offset( 0), |
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/*51*/ extra_bits(4) | extra_run | run_offset(16) | level_offset( 1), |
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/*52*/ extra_bits(2) | extra_level | run_offset( 0) | level_offset( 4), |
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/*53*/ extra_bits(2) | extra_level | run_offset( 0) | level_offset( 8), |
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/*54*/ extra_bits(2) | extra_level | run_offset( 0) | level_offset(12), |
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/*55*/ extra_bits(3) | extra_level | run_offset( 0) | level_offset(16), |
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/*56*/ extra_bits(3) | extra_level | run_offset( 0) | level_offset(24), |
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/*57*/ extra_bits(2) | extra_level | run_offset( 1) | level_offset( 3), |
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/*58*/ extra_bits(3) | extra_level | run_offset( 1) | level_offset( 7), |
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/*59*/ extra_bits(2) | extra_run | run_offset(16) | level_offset( 0), |
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/*60*/ extra_bits(2) | extra_run | run_offset(20) | level_offset( 0), |
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/*61*/ extra_bits(2) | extra_run | run_offset(24) | level_offset( 0), |
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/*62*/ extra_bits(2) | extra_run | run_offset(28) | level_offset( 0), |
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/*63*/ extra_bits(4) | extra_run | run_offset(32) | level_offset( 0), |
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/*64*/ extra_bits(4) | extra_run | run_offset(48) | level_offset( 0), |
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/*65*/ extra_bits(2) | extra_run | run_offset( 4) | level_offset( 1), |
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/*66*/ extra_bits(3) | extra_run | run_offset( 8) | level_offset( 1), |
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/*67*/ extra_bits(4) | extra_run | run_offset(16) | level_offset( 1), |
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/*68*/ extra_bits(2) | extra_level | run_offset( 0) | level_offset( 4), |
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/*69*/ extra_bits(3) | extra_level | run_offset( 0) | level_offset( 8), |
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/*70*/ extra_bits(4) | extra_level | run_offset( 0) | level_offset(16), |
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/*71*/ extra_bits(2) | extra_level | run_offset( 1) | level_offset( 3), |
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/*72*/ extra_bits(3) | extra_level | run_offset( 1) | level_offset( 7), |
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}; |
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//extra_bits = 3bits; extra_run/level = 1 bit; run_offset = 6bits; level_offset = 5 bits; |
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#undef extra_bits |
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#undef extra_run |
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#undef extra_level |
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#undef run_offset |
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#undef level_offset |
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static void x8_get_ac_rlf(IntraX8Context * const w, const int mode, |
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int * const run, int * const level, int * const final){ |
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MpegEncContext * const s= w->s; |
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int i,e; |
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// x8_select_ac_table(w,mode); |
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i = get_vlc2(&s->gb, w->j_ac_vlc[mode]->table, AC_VLC_BITS, AC_VLC_MTD); |
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if(i<46){ //[0-45] |
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int t,l; |
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if(i<0){ |
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(*level)=(*final)=//prevent 'may be used unilitialized' |
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(*run)=64;//this would cause error exit in the ac loop |
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return; |
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} |
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(*final) = t = (i>22); |
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i-=23*t; |
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/* |
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i== 0-15 r=0-15 l=0 ;r=i& %01111 |
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i==16-19 r=0-3 l=1 ;r=i& %00011 |
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i==20-21 r=0-1 l=2 ;r=i& %00001 |
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i==22 r=0 l=3 ;r=i& %00000 |
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l=lut_l[i/2]={0,0,0,0,0,0,0,0,1,1,2,3}[i>>1];// 11 10'01 01'00 00'00 00'00 00'00 00 => 0xE50000 |
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t=lut_mask[l]={0x0f,0x03,0x01,0x00}[l]; as i<256 the higher bits do not matter */ |
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l=(0xE50000>>(i&(0x1E)))&3;/*0x1E or (~1) or ((i>>1)<<1)*/ |
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t=(0x01030F>>(l<<3)); |
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(*run) = i&t; |
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(*level) = l; |
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}else if(i<73){//[46-72] |
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uint32_t sm; |
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uint32_t mask; |
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i-=46; |
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sm=ac_decode_table[i]; |
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e=get_bits(&s->gb,sm&0xF);sm>>=8;//3bits |
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mask=sm&0xff;sm>>=8; //1bit |
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(*run) =(sm&0xff) + (e&( mask));//6bits |
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(*level)=(sm>>8) + (e&(~mask));//5bits |
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(*final)=i>(58-46); |
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}else if(i<75){//[73-74] |
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static const uint8_t crazy_mix_runlevel[32]={ |
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0x22,0x32,0x33,0x53,0x23,0x42,0x43,0x63, |
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0x24,0x52,0x34,0x73,0x25,0x62,0x44,0x83, |
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0x26,0x72,0x35,0x54,0x27,0x82,0x45,0x64, |
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0x28,0x92,0x36,0x74,0x29,0xa2,0x46,0x84}; |
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(*final)=!(i&1); |
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e=get_bits(&s->gb,5);//get the extra bits |
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(*run) =crazy_mix_runlevel[e]>>4; |
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(*level)=crazy_mix_runlevel[e]&0x0F; |
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}else{ |
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(*level)=get_bits( &s->gb, 7-3*(i&1)); |
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(*run) =get_bits( &s->gb, 6); |
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(*final)=get_bits1(&s->gb); |
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} |
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return; |
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} |
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//static const uint8_t dc_extra_sbits[] ={0, 1,1, 1,1, 2,2, 3,3, 4,4, 5,5, 6,6, 7,7 }; |
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static const uint8_t dc_index_offset[] ={ 0, 1,2, 3,4, 5,7, 9,13, 17,25, 33,49, 65,97, 129,193}; |
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static int x8_get_dc_rlf(IntraX8Context * const w,int const mode, int * const level, int * const final){ |
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MpegEncContext * const s= w->s; |
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int i,e,c; |
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av_assert2(mode<3); |
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if( !w->j_dc_vlc[mode] ) { |
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int table_index; |
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table_index = get_bits(&s->gb, 3); |
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//4 modes, same table |
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w->j_dc_vlc[mode]= &j_dc_vlc[w->quant<13][table_index]; |
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} |
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i=get_vlc2(&s->gb, w->j_dc_vlc[mode]->table, DC_VLC_BITS, DC_VLC_MTD); |
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/*(i>=17) {i-=17;final=1;}*/ |
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c= i>16; |
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(*final)=c; |
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i-=17*c; |
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if(i<=0){ |
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(*level)=0; |
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return -i; |
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} |
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c=(i+1)>>1;//hackish way to calculate dc_extra_sbits[] |
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c-=c>1; |
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e=get_bits(&s->gb,c);//get the extra bits |
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i=dc_index_offset[i]+(e>>1); |
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e= -(e & 1);//0,0xffffff |
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(*level)= (i ^ e) - e;// (i^0)-0 , (i^0xff)-(-1) |
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return 0; |
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} |
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//end of huffman |
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static int x8_setup_spatial_predictor(IntraX8Context * const w, const int chroma){ |
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MpegEncContext * const s= w->s; |
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int range; |
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int sum; |
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int quant; |
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w->dsp.setup_spatial_compensation(s->dest[chroma], s->edge_emu_buffer, |
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s->current_picture.f.linesize[chroma>0], |
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&range, &sum, w->edges); |
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if(chroma){ |
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w->orient=w->chroma_orient; |
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quant=w->quant_dc_chroma; |
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}else{ |
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quant=w->quant; |
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} |
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w->flat_dc=0; |
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if(range < quant || range < 3){ |
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w->orient=0; |
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if(range < 3){//yep you read right, a +-1 idct error may break decoding! |
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w->flat_dc=1; |
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sum+=9; |
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w->predicted_dc = (sum*6899)>>17;//((1<<17)+9)/(8+8+1+2)=6899 |
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} |
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} |
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if(chroma) |
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return 0; |
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av_assert2(w->orient < 3); |
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if(range < 2*w->quant){ |
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if( (w->edges&3) == 0){ |
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if(w->orient==1) w->orient=11; |
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if(w->orient==2) w->orient=10; |
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}else{ |
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w->orient=0; |
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} |
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w->raw_orient=0; |
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}else{ |
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static const uint8_t prediction_table[3][12]={ |
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{0,8,4, 10,11, 2,6,9,1,3,5,7}, |
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{4,0,8, 11,10, 3,5,2,6,9,1,7}, |
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{8,0,4, 10,11, 1,7,2,6,9,3,5} |
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}; |
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w->raw_orient=x8_get_orient_vlc(w); |
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if(w->raw_orient<0) return -1; |
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av_assert2(w->raw_orient < 12 ); |
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av_assert2(w->orient<3); |
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w->orient=prediction_table[w->orient][w->raw_orient]; |
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} |
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return 0; |
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} |
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static void x8_update_predictions(IntraX8Context * const w, const int orient, const int est_run ){ |
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MpegEncContext * const s= w->s; |
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w->prediction_table[s->mb_x*2+(s->mb_y&1)] = (est_run<<2) + 1*(orient==4) + 2*(orient==8); |
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/* |
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y=2n+0 ->//0 2 4 |
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y=2n+1 ->//1 3 5 |
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*/ |
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} |
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static void x8_get_prediction_chroma(IntraX8Context * const w){ |
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MpegEncContext * const s= w->s; |
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w->edges = 1*( !(s->mb_x>>1) ); |
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w->edges|= 2*( !(s->mb_y>>1) ); |
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w->edges|= 4*( s->mb_x >= (2*s->mb_width-1) );//mb_x for chroma would always be odd |
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w->raw_orient=0; |
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if(w->edges&3){//lut_co[8]={inv,4,8,8, inv,4,8,8}<- =>{1,1,0,0;1,1,0,0} => 0xCC |
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w->chroma_orient=4<<((0xCC>>w->edges)&1); |
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return; |
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} |
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w->chroma_orient = (w->prediction_table[2*s->mb_x-2] & 0x03)<<2;//block[x-1][y|1-1)] |
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} |
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static void x8_get_prediction(IntraX8Context * const w){ |
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MpegEncContext * const s= w->s; |
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int a,b,c,i; |
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w->edges = 1*( !s->mb_x ); |
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w->edges|= 2*( !s->mb_y ); |
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w->edges|= 4*( s->mb_x >= (2*s->mb_width-1) ); |
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switch(w->edges&3){ |
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case 0: |
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break; |
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case 1: |
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//take the one from the above block[0][y-1] |
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w->est_run = w->prediction_table[!(s->mb_y&1)]>>2; |
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w->orient = 1; |
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return; |
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case 2: |
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//take the one from the previous block[x-1][0] |
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w->est_run = w->prediction_table[2*s->mb_x-2]>>2; |
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w->orient = 2; |
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return; |
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case 3: |
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w->est_run = 16; |
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w->orient = 0; |
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return; |
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} |
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//no edge cases |
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b= w->prediction_table[2*s->mb_x + !(s->mb_y&1) ];//block[x ][y-1] |
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a= w->prediction_table[2*s->mb_x-2 + (s->mb_y&1) ];//block[x-1][y ] |
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c= w->prediction_table[2*s->mb_x-2 + !(s->mb_y&1) ];//block[x-1][y-1] |
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w->est_run = FFMIN(b,a); |
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/* This condition has nothing to do with w->edges, even if it looks |
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similar it would trigger if e.g. x=3;y=2; |
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I guess somebody wrote something wrong and it became standard. */ |
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if( (s->mb_x & s->mb_y) != 0 ) w->est_run=FFMIN(c,w->est_run); |
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w->est_run>>=2; |
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a&=3; |
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b&=3; |
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c&=3; |
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i=( 0xFFEAF4C4>>(2*b+8*a) )&3; |
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if(i!=3) w->orient=i; |
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else w->orient=( 0xFFEAD8>>(2*c+8*(w->quant>12)) )&3; |
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/* |
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lut1[b][a]={ |
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->{0, 1, 0, pad}, |
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{0, 1, X, pad}, |
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{2, 2, 2, pad}} |
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pad 2 2 2; pad X 1 0; pad 0 1 0 <- |
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-> 11 10 '10 10 '11 11'01 00 '11 00'01 00=>0xEAF4C4 |
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lut2[q>12][c]={ |
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->{0,2,1,pad}, |
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{2,2,2,pad}} |
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pad 2 2 2; pad 1 2 0 <- |
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-> 11 10'10 10 '11 01'10 00=>0xEAD8 |
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*/ |
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} |
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static void x8_ac_compensation(IntraX8Context * const w, int const direction, int const dc_level){ |
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MpegEncContext * const s= w->s; |
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int t; |
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#define B(x,y) s->block[0][s->dsp.idct_permutation[(x)+(y)*8]] |
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#define T(x) ((x) * dc_level + 0x8000) >> 16; |
|
switch(direction){ |
|
case 0: |
|
t = T(3811);//h |
|
B(1,0) -= t; |
|
B(0,1) -= t; |
|
|
|
t = T(487);//e |
|
B(2,0) -= t; |
|
B(0,2) -= t; |
|
|
|
t = T(506);//f |
|
B(3,0) -= t; |
|
B(0,3) -= t; |
|
|
|
t = T(135);//c |
|
B(4,0) -= t; |
|
B(0,4) -= t; |
|
B(2,1) += t; |
|
B(1,2) += t; |
|
B(3,1) += t; |
|
B(1,3) += t; |
|
|
|
t = T(173);//d |
|
B(5,0) -= t; |
|
B(0,5) -= t; |
|
|
|
t = T(61);//b |
|
B(6,0) -= t; |
|
B(0,6) -= t; |
|
B(5,1) += t; |
|
B(1,5) += t; |
|
|
|
t = T(42); //a |
|
B(7,0) -= t; |
|
B(0,7) -= t; |
|
B(4,1) += t; |
|
B(1,4) += t; |
|
B(4,4) += t; |
|
|
|
t = T(1084);//g |
|
B(1,1) += t; |
|
|
|
s->block_last_index[0] = FFMAX(s->block_last_index[0], 7*8); |
|
break; |
|
case 1: |
|
B(0,1) -= T(6269); |
|
B(0,3) -= T( 708); |
|
B(0,5) -= T( 172); |
|
B(0,7) -= T( 73); |
|
|
|
s->block_last_index[0] = FFMAX(s->block_last_index[0], 7*8); |
|
break; |
|
case 2: |
|
B(1,0) -= T(6269); |
|
B(3,0) -= T( 708); |
|
B(5,0) -= T( 172); |
|
B(7,0) -= T( 73); |
|
|
|
s->block_last_index[0] = FFMAX(s->block_last_index[0], 7); |
|
break; |
|
} |
|
#undef B |
|
#undef T |
|
} |
|
|
|
static void dsp_x8_put_solidcolor(uint8_t const pix, uint8_t * dst, int const linesize){ |
|
int k; |
|
for(k=0;k<8;k++){ |
|
memset(dst,pix,8); |
|
dst+=linesize; |
|
} |
|
} |
|
|
|
static const int16_t quant_table[64] = { |
|
256, 256, 256, 256, 256, 256, 259, 262, |
|
265, 269, 272, 275, 278, 282, 285, 288, |
|
292, 295, 299, 303, 306, 310, 314, 317, |
|
321, 325, 329, 333, 337, 341, 345, 349, |
|
353, 358, 362, 366, 371, 375, 379, 384, |
|
389, 393, 398, 403, 408, 413, 417, 422, |
|
428, 433, 438, 443, 448, 454, 459, 465, |
|
470, 476, 482, 488, 493, 499, 505, 511 |
|
}; |
|
|
|
static int x8_decode_intra_mb(IntraX8Context* const w, const int chroma){ |
|
MpegEncContext * const s= w->s; |
|
|
|
uint8_t * scantable; |
|
int final,run,level; |
|
int ac_mode,dc_mode,est_run,dc_level; |
|
int pos,n; |
|
int zeros_only; |
|
int use_quant_matrix; |
|
int sign; |
|
|
|
av_assert2(w->orient<12); |
|
s->dsp.clear_block(s->block[0]); |
|
|
|
if(chroma){ |
|
dc_mode=2; |
|
}else{ |
|
dc_mode=!!w->est_run;//0,1 |
|
} |
|
|
|
if(x8_get_dc_rlf(w, dc_mode, &dc_level, &final)) return -1; |
|
n=0; |
|
zeros_only=0; |
|
if(!final){//decode ac |
|
use_quant_matrix=w->use_quant_matrix; |
|
if(chroma){ |
|
ac_mode = 1; |
|
est_run = 64;//not used |
|
}else{ |
|
if (w->raw_orient < 3){ |
|
use_quant_matrix = 0; |
|
} |
|
if(w->raw_orient > 4){ |
|
ac_mode = 0; |
|
est_run = 64; |
|
}else{ |
|
if(w->est_run > 1){ |
|
ac_mode = 2; |
|
est_run=w->est_run; |
|
}else{ |
|
ac_mode = 3; |
|
est_run = 64; |
|
} |
|
} |
|
} |
|
x8_select_ac_table(w,ac_mode); |
|
/*scantable_selector[12]={0,2,0,1,1,1,0,2,2,0,1,2};<- |
|
-> 10'01' 00'10' 10'00' 01'01' 01'00' 10'00 =>0x928548 */ |
|
scantable = w->scantable[ (0x928548>>(2*w->orient))&3 ].permutated; |
|
pos=0; |
|
do { |
|
n++; |
|
if( n >= est_run ){ |
|
ac_mode=3; |
|
x8_select_ac_table(w,3); |
|
} |
|
|
|
x8_get_ac_rlf(w,ac_mode,&run,&level,&final); |
|
|
|
pos+=run+1; |
|
if(pos>63){ |
|
//this also handles vlc error in x8_get_ac_rlf |
|
return -1; |
|
} |
|
level= (level+1) * w->dquant; |
|
level+= w->qsum; |
|
|
|
sign = - get_bits1(&s->gb); |
|
level = (level ^ sign) - sign; |
|
|
|
if(use_quant_matrix){ |
|
level = (level*quant_table[pos])>>8; |
|
} |
|
s->block[0][ scantable[pos] ]=level; |
|
}while(!final); |
|
|
|
s->block_last_index[0]=pos; |
|
}else{//DC only |
|
s->block_last_index[0]=0; |
|
if(w->flat_dc && ((unsigned)(dc_level+1)) < 3){//[-1;1] |
|
int32_t divide_quant= !chroma ? w->divide_quant_dc_luma: |
|
w->divide_quant_dc_chroma; |
|
int32_t dc_quant = !chroma ? w->quant: |
|
w->quant_dc_chroma; |
|
|
|
//original intent dc_level+=predicted_dc/quant; but it got lost somewhere in the rounding |
|
dc_level+= (w->predicted_dc*divide_quant + (1<<12) )>>13; |
|
|
|
dsp_x8_put_solidcolor( av_clip_uint8((dc_level*dc_quant+4)>>3), |
|
s->dest[chroma], s->current_picture.f.linesize[!!chroma]); |
|
|
|
goto block_placed; |
|
} |
|
zeros_only = (dc_level == 0); |
|
} |
|
if(!chroma){ |
|
s->block[0][0] = dc_level*w->quant; |
|
}else{ |
|
s->block[0][0] = dc_level*w->quant_dc_chroma; |
|
} |
|
|
|
//there is !zero_only check in the original, but dc_level check is enough |
|
if( (unsigned int)(dc_level+1) >= 3 && (w->edges&3) != 3 ){ |
|
int direction; |
|
/*ac_comp_direction[orient] = { 0, 3, 3, 1, 1, 0, 0, 0, 2, 2, 2, 1 };<- |
|
-> 01'10' 10'10' 00'00' 00'01' 01'11' 11'00 =>0x6A017C */ |
|
direction= (0x6A017C>>(w->orient*2))&3; |
|
if (direction != 3){ |
|
x8_ac_compensation(w, direction, s->block[0][0]);//modify block_last[] |
|
} |
|
} |
|
|
|
if(w->flat_dc){ |
|
dsp_x8_put_solidcolor(w->predicted_dc, s->dest[chroma], s->current_picture.f.linesize[!!chroma]); |
|
}else{ |
|
w->dsp.spatial_compensation[w->orient]( s->edge_emu_buffer, |
|
s->dest[chroma], |
|
s->current_picture.f.linesize[!!chroma] ); |
|
} |
|
if(!zeros_only) |
|
s->dsp.idct_add ( s->dest[chroma], |
|
s->current_picture.f.linesize[!!chroma], |
|
s->block[0] ); |
|
|
|
block_placed: |
|
|
|
if(!chroma){ |
|
x8_update_predictions(w,w->orient,n); |
|
} |
|
|
|
if(s->loop_filter){ |
|
uint8_t* ptr = s->dest[chroma]; |
|
int linesize = s->current_picture.f.linesize[!!chroma]; |
|
|
|
if(!( (w->edges&2) || ( zeros_only && (w->orient|4)==4 ) )){ |
|
w->dsp.h_loop_filter(ptr, linesize, w->quant); |
|
} |
|
if(!( (w->edges&1) || ( zeros_only && (w->orient|8)==8 ) )){ |
|
w->dsp.v_loop_filter(ptr, linesize, w->quant); |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static void x8_init_block_index(MpegEncContext *s){ //FIXME maybe merge with ff_* |
|
//not s->linesize as this would be wrong for field pics |
|
//not that IntraX8 has interlacing support ;) |
|
const int linesize = s->current_picture.f.linesize[0]; |
|
const int uvlinesize = s->current_picture.f.linesize[1]; |
|
|
|
s->dest[0] = s->current_picture.f.data[0]; |
|
s->dest[1] = s->current_picture.f.data[1]; |
|
s->dest[2] = s->current_picture.f.data[2]; |
|
|
|
s->dest[0] += s->mb_y * linesize << 3; |
|
s->dest[1] += ( s->mb_y&(~1) ) * uvlinesize << 2;//chroma blocks are on add rows |
|
s->dest[2] += ( s->mb_y&(~1) ) * uvlinesize << 2; |
|
} |
|
|
|
/** |
|
* Initialize IntraX8 frame decoder. |
|
* Requires valid MpegEncContext with valid s->mb_width before calling. |
|
* @param w pointer to IntraX8Context |
|
* @param s pointer to MpegEncContext of the parent codec |
|
*/ |
|
av_cold void ff_intrax8_common_init(IntraX8Context * w, MpegEncContext * const s){ |
|
|
|
w->s=s; |
|
x8_vlc_init(); |
|
av_assert0(s->mb_width>0); |
|
w->prediction_table=av_mallocz(s->mb_width*2*2);//two rows, 2 blocks per cannon mb |
|
|
|
ff_init_scantable(s->dsp.idct_permutation, &w->scantable[0], ff_wmv1_scantable[0]); |
|
ff_init_scantable(s->dsp.idct_permutation, &w->scantable[1], ff_wmv1_scantable[2]); |
|
ff_init_scantable(s->dsp.idct_permutation, &w->scantable[2], ff_wmv1_scantable[3]); |
|
|
|
ff_intrax8dsp_init(&w->dsp); |
|
} |
|
|
|
/** |
|
* Destroy IntraX8 frame structure. |
|
* @param w pointer to IntraX8Context |
|
*/ |
|
av_cold void ff_intrax8_common_end(IntraX8Context * w) |
|
{ |
|
av_freep(&w->prediction_table); |
|
} |
|
|
|
/** |
|
* Decode single IntraX8 frame. |
|
* The parent codec must fill s->loopfilter and s->gb (bitstream). |
|
* The parent codec must call MPV_frame_start(), ff_er_frame_start() before calling this function. |
|
* The parent codec must call ff_er_frame_end(), MPV_frame_end() after calling this function. |
|
* This function does not use MPV_decode_mb(). |
|
* lowres decoding is theoretically impossible. |
|
* @param w pointer to IntraX8Context |
|
* @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1. |
|
* @param quant_offset offset away from zero |
|
*/ |
|
//FIXME extern uint8_t ff_wmv3_dc_scale_table[32]; |
|
int ff_intrax8_decode_picture(IntraX8Context * const w, int dquant, int quant_offset){ |
|
MpegEncContext * const s= w->s; |
|
int mb_xy; |
|
w->use_quant_matrix = get_bits1(&s->gb); |
|
|
|
w->dquant = dquant; |
|
w->quant = dquant >> 1; |
|
w->qsum = quant_offset; |
|
|
|
w->divide_quant_dc_luma = ((1<<16) + (w->quant>>1)) / w->quant; |
|
if(w->quant < 5){ |
|
w->quant_dc_chroma = w->quant; |
|
w->divide_quant_dc_chroma = w->divide_quant_dc_luma; |
|
}else{ |
|
w->quant_dc_chroma = w->quant+((w->quant+3)>>3); |
|
w->divide_quant_dc_chroma = ((1<<16) + (w->quant_dc_chroma>>1)) / w->quant_dc_chroma; |
|
} |
|
x8_reset_vlc_tables(w); |
|
|
|
s->resync_mb_x=0; |
|
s->resync_mb_y=0; |
|
|
|
for(s->mb_y=0; s->mb_y < s->mb_height*2; s->mb_y++){ |
|
x8_init_block_index(s); |
|
mb_xy=(s->mb_y>>1)*s->mb_stride; |
|
|
|
for(s->mb_x=0; s->mb_x < s->mb_width*2; s->mb_x++){ |
|
x8_get_prediction(w); |
|
if(x8_setup_spatial_predictor(w,0)) goto error; |
|
if(x8_decode_intra_mb(w,0)) goto error; |
|
|
|
if( s->mb_x & s->mb_y & 1 ){ |
|
x8_get_prediction_chroma(w); |
|
|
|
/*when setting up chroma, no vlc is read, |
|
so no error condition can be reached*/ |
|
x8_setup_spatial_predictor(w,1); |
|
if(x8_decode_intra_mb(w,1)) goto error; |
|
|
|
x8_setup_spatial_predictor(w,2); |
|
if(x8_decode_intra_mb(w,2)) goto error; |
|
|
|
s->dest[1]+= 8; |
|
s->dest[2]+= 8; |
|
|
|
/*emulate MB info in the relevant tables*/ |
|
s->mbskip_table [mb_xy]=0; |
|
s->mbintra_table[mb_xy]=1; |
|
s->current_picture.f.qscale_table[mb_xy] = w->quant; |
|
mb_xy++; |
|
} |
|
s->dest[0]+= 8; |
|
} |
|
if(s->mb_y&1){ |
|
ff_mpeg_draw_horiz_band(s, (s->mb_y-1)*8, 16); |
|
} |
|
} |
|
|
|
error: |
|
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, |
|
(s->mb_x>>1)-1, (s->mb_y>>1)-1, |
|
ER_MB_END ); |
|
return 0; |
|
}
|
|
|