f244cbd5
 Hu Chunming
ffmpeg支持h264编码
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/*****************************************************************************
* vlc.c : vlc tables
*****************************************************************************
* Copyright (C) 2003-2024 x264 project
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Fiona Glaser <fiona@x264.com>
* Henrik Gramner <henrik@gramner.com>
*
* This program 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.
*
* This program 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., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at licensing@x264.com.
*****************************************************************************/
#include "common.h"
vlc_large_t x264_level_token[7][LEVEL_TABLE_SIZE];
uint32_t x264_run_before[1<<16];
void x264_cavlc_init( x264_t *h )
{
for( int i_suffix = 0; i_suffix < 7; i_suffix++ )
for( int16_t level = -LEVEL_TABLE_SIZE/2; level < LEVEL_TABLE_SIZE/2; level++ )
{
int mask = level >> 15;
int abs_level = (level^mask)-mask;
int i_level_code = abs_level ? abs_level*2-mask-2 : 0;
int i_next = i_suffix;
vlc_large_t *vlc = &x264_level_token[i_suffix][level+LEVEL_TABLE_SIZE/2];
if( ( i_level_code >> i_suffix ) < 14 )
{
vlc->i_size = (i_level_code >> i_suffix) + 1 + i_suffix;
vlc->i_bits = (1<<i_suffix) + (i_level_code & ((1<<i_suffix)-1));
}
else if( i_suffix == 0 && i_level_code < 30 )
{
vlc->i_size = 19;
vlc->i_bits = (1<<4) + (i_level_code - 14);
}
else if( i_suffix > 0 && ( i_level_code >> i_suffix ) == 14 )
{
vlc->i_size = 15 + i_suffix;
vlc->i_bits = (1<<i_suffix) + (i_level_code & ((1<<i_suffix)-1));
}
else
{
i_level_code -= 15 << i_suffix;
if( i_suffix == 0 )
i_level_code -= 15;
vlc->i_size = 28;
vlc->i_bits = (1<<12) + i_level_code;
}
if( i_next == 0 )
i_next++;
if( abs_level > (3 << (i_next-1)) && i_next < 6 )
i_next++;
vlc->i_next = i_next;
}
x264_run_before[0] = 0;
x264_run_before[1] = 0;
for( uint32_t i = 2; i < (1<<16); i++ )
{
x264_run_level_t runlevel;
ALIGNED_ARRAY_16( dctcoef, dct, [16] );
int size = 0;
int bits = 0;
for( int j = 0; j < 16; j++ )
dct[j] = i&(1<<j);
int total = h->quantf.coeff_level_run[DCT_LUMA_4x4]( dct, &runlevel );
int zeros = runlevel.last + 1 - total;
uint32_t mask = i << (x264_clz( i ) + 1);
for( int j = 0; j < total-1 && zeros > 0; j++ )
{
int idx = X264_MIN(zeros, 7) - 1;
int run = x264_clz( mask );
int len = x264_run_before_init[idx][run].i_size;
size += len;
bits <<= len;
bits |= x264_run_before_init[idx][run].i_bits;
zeros -= run;
mask <<= run + 1;
}
x264_run_before[i] = (bits << 5) + size;
}
}
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