152 lines
7.5 KiB
C
152 lines
7.5 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main.h"
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/* shell coder; pulse-subframe length is hardcoded */
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static OPUS_INLINE void combine_pulses(
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opus_int *out, /* O combined pulses vector [len] */
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const opus_int *in, /* I input vector [2 * len] */
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const opus_int len /* I number of OUTPUT samples */
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)
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{
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opus_int k;
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for( k = 0; k < len; k++ ) {
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out[ k ] = in[ 2 * k ] + in[ 2 * k + 1 ];
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}
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}
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static OPUS_INLINE void encode_split(
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ec_enc *psRangeEnc, /* I/O compressor data structure */
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const opus_int p_child1, /* I pulse amplitude of first child subframe */
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const opus_int p, /* I pulse amplitude of current subframe */
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const opus_uint8 *shell_table /* I table of shell cdfs */
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)
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{
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if( p > 0 ) {
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ec_enc_icdf( psRangeEnc, p_child1, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
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}
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}
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static OPUS_INLINE void decode_split(
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opus_int16 *p_child1, /* O pulse amplitude of first child subframe */
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opus_int16 *p_child2, /* O pulse amplitude of second child subframe */
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ec_dec *psRangeDec, /* I/O Compressor data structure */
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const opus_int p, /* I pulse amplitude of current subframe */
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const opus_uint8 *shell_table /* I table of shell cdfs */
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)
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{
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if( p > 0 ) {
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p_child1[ 0 ] = ec_dec_icdf( psRangeDec, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
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p_child2[ 0 ] = p - p_child1[ 0 ];
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} else {
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p_child1[ 0 ] = 0;
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p_child2[ 0 ] = 0;
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}
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}
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/* Shell encoder, operates on one shell code frame of 16 pulses */
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void silk_shell_encoder(
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ec_enc *psRangeEnc, /* I/O compressor data structure */
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const opus_int *pulses0 /* I data: nonnegative pulse amplitudes */
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)
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{
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opus_int pulses1[ 8 ], pulses2[ 4 ], pulses3[ 2 ], pulses4[ 1 ];
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/* this function operates on one shell code frame of 16 pulses */
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silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 );
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/* tree representation per pulse-subframe */
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combine_pulses( pulses1, pulses0, 8 );
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combine_pulses( pulses2, pulses1, 4 );
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combine_pulses( pulses3, pulses2, 2 );
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combine_pulses( pulses4, pulses3, 1 );
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encode_split( psRangeEnc, pulses3[ 0 ], pulses4[ 0 ], silk_shell_code_table3 );
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encode_split( psRangeEnc, pulses2[ 0 ], pulses3[ 0 ], silk_shell_code_table2 );
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encode_split( psRangeEnc, pulses1[ 0 ], pulses2[ 0 ], silk_shell_code_table1 );
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encode_split( psRangeEnc, pulses0[ 0 ], pulses1[ 0 ], silk_shell_code_table0 );
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encode_split( psRangeEnc, pulses0[ 2 ], pulses1[ 1 ], silk_shell_code_table0 );
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encode_split( psRangeEnc, pulses1[ 2 ], pulses2[ 1 ], silk_shell_code_table1 );
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encode_split( psRangeEnc, pulses0[ 4 ], pulses1[ 2 ], silk_shell_code_table0 );
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encode_split( psRangeEnc, pulses0[ 6 ], pulses1[ 3 ], silk_shell_code_table0 );
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encode_split( psRangeEnc, pulses2[ 2 ], pulses3[ 1 ], silk_shell_code_table2 );
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encode_split( psRangeEnc, pulses1[ 4 ], pulses2[ 2 ], silk_shell_code_table1 );
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encode_split( psRangeEnc, pulses0[ 8 ], pulses1[ 4 ], silk_shell_code_table0 );
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encode_split( psRangeEnc, pulses0[ 10 ], pulses1[ 5 ], silk_shell_code_table0 );
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encode_split( psRangeEnc, pulses1[ 6 ], pulses2[ 3 ], silk_shell_code_table1 );
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encode_split( psRangeEnc, pulses0[ 12 ], pulses1[ 6 ], silk_shell_code_table0 );
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encode_split( psRangeEnc, pulses0[ 14 ], pulses1[ 7 ], silk_shell_code_table0 );
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}
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/* Shell decoder, operates on one shell code frame of 16 pulses */
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void silk_shell_decoder(
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opus_int16 *pulses0, /* O data: nonnegative pulse amplitudes */
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ec_dec *psRangeDec, /* I/O Compressor data structure */
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const opus_int pulses4 /* I number of pulses per pulse-subframe */
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)
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{
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opus_int16 pulses3[ 2 ], pulses2[ 4 ], pulses1[ 8 ];
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/* this function operates on one shell code frame of 16 pulses */
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silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 );
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decode_split( &pulses3[ 0 ], &pulses3[ 1 ], psRangeDec, pulses4, silk_shell_code_table3 );
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decode_split( &pulses2[ 0 ], &pulses2[ 1 ], psRangeDec, pulses3[ 0 ], silk_shell_code_table2 );
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decode_split( &pulses1[ 0 ], &pulses1[ 1 ], psRangeDec, pulses2[ 0 ], silk_shell_code_table1 );
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decode_split( &pulses0[ 0 ], &pulses0[ 1 ], psRangeDec, pulses1[ 0 ], silk_shell_code_table0 );
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decode_split( &pulses0[ 2 ], &pulses0[ 3 ], psRangeDec, pulses1[ 1 ], silk_shell_code_table0 );
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decode_split( &pulses1[ 2 ], &pulses1[ 3 ], psRangeDec, pulses2[ 1 ], silk_shell_code_table1 );
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decode_split( &pulses0[ 4 ], &pulses0[ 5 ], psRangeDec, pulses1[ 2 ], silk_shell_code_table0 );
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decode_split( &pulses0[ 6 ], &pulses0[ 7 ], psRangeDec, pulses1[ 3 ], silk_shell_code_table0 );
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decode_split( &pulses2[ 2 ], &pulses2[ 3 ], psRangeDec, pulses3[ 1 ], silk_shell_code_table2 );
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decode_split( &pulses1[ 4 ], &pulses1[ 5 ], psRangeDec, pulses2[ 2 ], silk_shell_code_table1 );
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decode_split( &pulses0[ 8 ], &pulses0[ 9 ], psRangeDec, pulses1[ 4 ], silk_shell_code_table0 );
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decode_split( &pulses0[ 10 ], &pulses0[ 11 ], psRangeDec, pulses1[ 5 ], silk_shell_code_table0 );
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decode_split( &pulses1[ 6 ], &pulses1[ 7 ], psRangeDec, pulses2[ 3 ], silk_shell_code_table1 );
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decode_split( &pulses0[ 12 ], &pulses0[ 13 ], psRangeDec, pulses1[ 6 ], silk_shell_code_table0 );
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decode_split( &pulses0[ 14 ], &pulses0[ 15 ], psRangeDec, pulses1[ 7 ], silk_shell_code_table0 );
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}
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