152 lines
7.5 KiB
C
152 lines
7.5 KiB
C
|
/***********************************************************************
|
||
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions
|
||
|
|
are met:
|
||
|
|
- Redistributions of source code must retain the above copyright notice,
|
||
|
|
this list of conditions and the following disclaimer.
|
||
|
|
- Redistributions in binary form must reproduce the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer in the
|
||
|
|
documentation and/or other materials provided with the distribution.
|
||
|
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the
|
||
|
|
names of specific contributors, may be used to endorse or promote
|
||
|
|
products derived from this software without specific prior written
|
||
|
|
permission.
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
|
||
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
***********************************************************************/
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
#include "config.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "main.h"
|
||
|
|
|
||
|
|
/* shell coder; pulse-subframe length is hardcoded */
|
||
|
|
|
||
|
|
static __inline void combine_pulses(
|
||
|
|
opus_int *out, /* O combined pulses vector [len] */
|
||
|
|
const opus_int *in, /* I input vector [2 * len] */
|
||
|
|
const opus_int len /* I number of OUTPUT samples */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
opus_int k;
|
||
|
|
for( k = 0; k < len; k++ ) {
|
||
|
|
out[ k ] = in[ 2 * k ] + in[ 2 * k + 1 ];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline void encode_split(
|
||
|
|
ec_enc *psRangeEnc, /* I/O compressor data structure */
|
||
|
|
const opus_int p_child1, /* I pulse amplitude of first child subframe */
|
||
|
|
const opus_int p, /* I pulse amplitude of current subframe */
|
||
|
|
const opus_uint8 *shell_table /* I table of shell cdfs */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
if( p > 0 ) {
|
||
|
|
ec_enc_icdf( psRangeEnc, p_child1, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline void decode_split(
|
||
|
|
opus_int *p_child1, /* O pulse amplitude of first child subframe */
|
||
|
|
opus_int *p_child2, /* O pulse amplitude of second child subframe */
|
||
|
|
ec_dec *psRangeDec, /* I/O Compressor data structure */
|
||
|
|
const opus_int p, /* I pulse amplitude of current subframe */
|
||
|
|
const opus_uint8 *shell_table /* I table of shell cdfs */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
if( p > 0 ) {
|
||
|
|
p_child1[ 0 ] = ec_dec_icdf( psRangeDec, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
|
||
|
|
p_child2[ 0 ] = p - p_child1[ 0 ];
|
||
|
|
} else {
|
||
|
|
p_child1[ 0 ] = 0;
|
||
|
|
p_child2[ 0 ] = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Shell encoder, operates on one shell code frame of 16 pulses */
|
||
|
|
void silk_shell_encoder(
|
||
|
|
ec_enc *psRangeEnc, /* I/O compressor data structure */
|
||
|
|
const opus_int *pulses0 /* I data: nonnegative pulse amplitudes */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
opus_int pulses1[ 8 ], pulses2[ 4 ], pulses3[ 2 ], pulses4[ 1 ];
|
||
|
|
|
||
|
|
/* this function operates on one shell code frame of 16 pulses */
|
||
|
|
silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 );
|
||
|
|
|
||
|
|
/* tree representation per pulse-subframe */
|
||
|
|
combine_pulses( pulses1, pulses0, 8 );
|
||
|
|
combine_pulses( pulses2, pulses1, 4 );
|
||
|
|
combine_pulses( pulses3, pulses2, 2 );
|
||
|
|
combine_pulses( pulses4, pulses3, 1 );
|
||
|
|
|
||
|
|
encode_split( psRangeEnc, pulses3[ 0 ], pulses4[ 0 ], silk_shell_code_table3 );
|
||
|
|
|
||
|
|
encode_split( psRangeEnc, pulses2[ 0 ], pulses3[ 0 ], silk_shell_code_table2 );
|
||
|
|
|
||
|
|
encode_split( psRangeEnc, pulses1[ 0 ], pulses2[ 0 ], silk_shell_code_table1 );
|
||
|
|
encode_split( psRangeEnc, pulses0[ 0 ], pulses1[ 0 ], silk_shell_code_table0 );
|
||
|
|
encode_split( psRangeEnc, pulses0[ 2 ], pulses1[ 1 ], silk_shell_code_table0 );
|
||
|
|
|
||
|
|
encode_split( psRangeEnc, pulses1[ 2 ], pulses2[ 1 ], silk_shell_code_table1 );
|
||
|
|
encode_split( psRangeEnc, pulses0[ 4 ], pulses1[ 2 ], silk_shell_code_table0 );
|
||
|
|
encode_split( psRangeEnc, pulses0[ 6 ], pulses1[ 3 ], silk_shell_code_table0 );
|
||
|
|
|
||
|
|
encode_split( psRangeEnc, pulses2[ 2 ], pulses3[ 1 ], silk_shell_code_table2 );
|
||
|
|
|
||
|
|
encode_split( psRangeEnc, pulses1[ 4 ], pulses2[ 2 ], silk_shell_code_table1 );
|
||
|
|
encode_split( psRangeEnc, pulses0[ 8 ], pulses1[ 4 ], silk_shell_code_table0 );
|
||
|
|
encode_split( psRangeEnc, pulses0[ 10 ], pulses1[ 5 ], silk_shell_code_table0 );
|
||
|
|
|
||
|
|
encode_split( psRangeEnc, pulses1[ 6 ], pulses2[ 3 ], silk_shell_code_table1 );
|
||
|
|
encode_split( psRangeEnc, pulses0[ 12 ], pulses1[ 6 ], silk_shell_code_table0 );
|
||
|
|
encode_split( psRangeEnc, pulses0[ 14 ], pulses1[ 7 ], silk_shell_code_table0 );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Shell decoder, operates on one shell code frame of 16 pulses */
|
||
|
|
void silk_shell_decoder(
|
||
|
|
opus_int *pulses0, /* O data: nonnegative pulse amplitudes */
|
||
|
|
ec_dec *psRangeDec, /* I/O Compressor data structure */
|
||
|
|
const opus_int pulses4 /* I number of pulses per pulse-subframe */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
opus_int pulses3[ 2 ], pulses2[ 4 ], pulses1[ 8 ];
|
||
|
|
|
||
|
|
/* this function operates on one shell code frame of 16 pulses */
|
||
|
|
silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 );
|
||
|
|
|
||
|
|
decode_split( &pulses3[ 0 ], &pulses3[ 1 ], psRangeDec, pulses4, silk_shell_code_table3 );
|
||
|
|
|
||
|
|
decode_split( &pulses2[ 0 ], &pulses2[ 1 ], psRangeDec, pulses3[ 0 ], silk_shell_code_table2 );
|
||
|
|
|
||
|
|
decode_split( &pulses1[ 0 ], &pulses1[ 1 ], psRangeDec, pulses2[ 0 ], silk_shell_code_table1 );
|
||
|
|
decode_split( &pulses0[ 0 ], &pulses0[ 1 ], psRangeDec, pulses1[ 0 ], silk_shell_code_table0 );
|
||
|
|
decode_split( &pulses0[ 2 ], &pulses0[ 3 ], psRangeDec, pulses1[ 1 ], silk_shell_code_table0 );
|
||
|
|
|
||
|
|
decode_split( &pulses1[ 2 ], &pulses1[ 3 ], psRangeDec, pulses2[ 1 ], silk_shell_code_table1 );
|
||
|
|
decode_split( &pulses0[ 4 ], &pulses0[ 5 ], psRangeDec, pulses1[ 2 ], silk_shell_code_table0 );
|
||
|
|
decode_split( &pulses0[ 6 ], &pulses0[ 7 ], psRangeDec, pulses1[ 3 ], silk_shell_code_table0 );
|
||
|
|
|
||
|
|
decode_split( &pulses2[ 2 ], &pulses2[ 3 ], psRangeDec, pulses3[ 1 ], silk_shell_code_table2 );
|
||
|
|
|
||
|
|
decode_split( &pulses1[ 4 ], &pulses1[ 5 ], psRangeDec, pulses2[ 2 ], silk_shell_code_table1 );
|
||
|
|
decode_split( &pulses0[ 8 ], &pulses0[ 9 ], psRangeDec, pulses1[ 4 ], silk_shell_code_table0 );
|
||
|
|
decode_split( &pulses0[ 10 ], &pulses0[ 11 ], psRangeDec, pulses1[ 5 ], silk_shell_code_table0 );
|
||
|
|
|
||
|
|
decode_split( &pulses1[ 6 ], &pulses1[ 7 ], psRangeDec, pulses2[ 3 ], silk_shell_code_table1 );
|
||
|
|
decode_split( &pulses0[ 12 ], &pulses0[ 13 ], psRangeDec, pulses1[ 6 ], silk_shell_code_table0 );
|
||
|
|
decode_split( &pulses0[ 14 ], &pulses0[ 15 ], psRangeDec, pulses1[ 7 ], silk_shell_code_table0 );
|
||
|
|
}
|