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