200 lines
8.4 KiB
C
200 lines
8.4 KiB
C
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/***********************************************************************
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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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/*********************************************/
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/* Encode quantization indices of excitation */
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/*********************************************/
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static __inline opus_int combine_and_check( /* return ok */
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opus_int *pulses_comb, /* O */
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const opus_int *pulses_in, /* I */
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opus_int max_pulses, /* I max value for sum of pulses */
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opus_int len /* I number of output values */
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)
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{
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opus_int k, sum;
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for( k = 0; k < len; k++ ) {
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sum = pulses_in[ 2 * k ] + pulses_in[ 2 * k + 1 ];
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if( sum > max_pulses ) {
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return 1;
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}
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pulses_comb[ k ] = sum;
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}
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return 0;
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}
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/* Encode quantization indices of excitation */
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void silk_encode_pulses(
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ec_enc *psRangeEnc, /* I/O compressor data structure */
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const opus_int signalType, /* I Signal type */
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const opus_int quantOffsetType, /* I quantOffsetType */
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opus_int8 pulses[], /* I quantization indices */
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const opus_int frame_length /* I Frame length */
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)
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{
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opus_int i, k, j, iter, bit, nLS, scale_down, RateLevelIndex = 0;
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opus_int32 abs_q, minSumBits_Q5, sumBits_Q5;
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opus_int abs_pulses[ MAX_FRAME_LENGTH ];
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opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ];
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opus_int nRshifts[ MAX_NB_SHELL_BLOCKS ];
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opus_int pulses_comb[ 8 ];
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opus_int *abs_pulses_ptr;
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const opus_int8 *pulses_ptr;
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const opus_uint8 *cdf_ptr;
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const opus_uint8 *nBits_ptr;
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silk_memset( pulses_comb, 0, 8 * sizeof( opus_int ) ); /* Fixing Valgrind reported problem*/
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/****************************/
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/* Prepare for shell coding */
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/****************************/
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/* Calculate number of shell blocks */
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silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
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iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
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if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) {
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silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
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iter++;
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silk_memset( &pulses[ frame_length ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof(opus_int8));
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}
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/* Take the absolute value of the pulses */
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for( i = 0; i < iter * SHELL_CODEC_FRAME_LENGTH; i+=4 ) {
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abs_pulses[i+0] = ( opus_int )silk_abs( pulses[ i + 0 ] );
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abs_pulses[i+1] = ( opus_int )silk_abs( pulses[ i + 1 ] );
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abs_pulses[i+2] = ( opus_int )silk_abs( pulses[ i + 2 ] );
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abs_pulses[i+3] = ( opus_int )silk_abs( pulses[ i + 3 ] );
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}
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/* Calc sum pulses per shell code frame */
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abs_pulses_ptr = abs_pulses;
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for( i = 0; i < iter; i++ ) {
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nRshifts[ i ] = 0;
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while( 1 ) {
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/* 1+1 -> 2 */
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scale_down = combine_and_check( pulses_comb, abs_pulses_ptr, silk_max_pulses_table[ 0 ], 8 );
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/* 2+2 -> 4 */
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scale_down += combine_and_check( pulses_comb, pulses_comb, silk_max_pulses_table[ 1 ], 4 );
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/* 4+4 -> 8 */
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scale_down += combine_and_check( pulses_comb, pulses_comb, silk_max_pulses_table[ 2 ], 2 );
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/* 8+8 -> 16 */
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scale_down += combine_and_check( &sum_pulses[ i ], pulses_comb, silk_max_pulses_table[ 3 ], 1 );
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if( scale_down ) {
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/* We need to downscale the quantization signal */
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nRshifts[ i ]++;
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for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
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abs_pulses_ptr[ k ] = silk_RSHIFT( abs_pulses_ptr[ k ], 1 );
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}
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} else {
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/* Jump out of while(1) loop and go to next shell coding frame */
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break;
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}
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}
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abs_pulses_ptr += SHELL_CODEC_FRAME_LENGTH;
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}
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/**************/
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/* Rate level */
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/**************/
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/* find rate level that leads to fewest bits for coding of pulses per block info */
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minSumBits_Q5 = silk_int32_MAX;
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for( k = 0; k < N_RATE_LEVELS - 1; k++ ) {
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nBits_ptr = silk_pulses_per_block_BITS_Q5[ k ];
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sumBits_Q5 = silk_rate_levels_BITS_Q5[ signalType >> 1 ][ k ];
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for( i = 0; i < iter; i++ ) {
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if( nRshifts[ i ] > 0 ) {
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sumBits_Q5 += nBits_ptr[ MAX_PULSES + 1 ];
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} else {
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sumBits_Q5 += nBits_ptr[ sum_pulses[ i ] ];
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}
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}
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if( sumBits_Q5 < minSumBits_Q5 ) {
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minSumBits_Q5 = sumBits_Q5;
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RateLevelIndex = k;
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}
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}
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ec_enc_icdf( psRangeEnc, RateLevelIndex, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
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/***************************************************/
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/* Sum-Weighted-Pulses Encoding */
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/***************************************************/
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cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ];
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for( i = 0; i < iter; i++ ) {
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if( nRshifts[ i ] == 0 ) {
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ec_enc_icdf( psRangeEnc, sum_pulses[ i ], cdf_ptr, 8 );
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} else {
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ec_enc_icdf( psRangeEnc, MAX_PULSES + 1, cdf_ptr, 8 );
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for( k = 0; k < nRshifts[ i ] - 1; k++ ) {
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ec_enc_icdf( psRangeEnc, MAX_PULSES + 1, silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
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}
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ec_enc_icdf( psRangeEnc, sum_pulses[ i ], silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
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}
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}
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/******************/
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/* Shell Encoding */
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/******************/
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for( i = 0; i < iter; i++ ) {
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if( sum_pulses[ i ] > 0 ) {
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silk_shell_encoder( psRangeEnc, &abs_pulses[ i * SHELL_CODEC_FRAME_LENGTH ] );
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}
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}
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/****************/
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/* LSB Encoding */
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/****************/
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for( i = 0; i < iter; i++ ) {
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if( nRshifts[ i ] > 0 ) {
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pulses_ptr = &pulses[ i * SHELL_CODEC_FRAME_LENGTH ];
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nLS = nRshifts[ i ] - 1;
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for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
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abs_q = (opus_int8)silk_abs( pulses_ptr[ k ] );
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for( j = nLS; j > 0; j-- ) {
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bit = silk_RSHIFT( abs_q, j ) & 1;
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ec_enc_icdf( psRangeEnc, bit, silk_lsb_iCDF, 8 );
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}
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bit = abs_q & 1;
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ec_enc_icdf( psRangeEnc, bit, silk_lsb_iCDF, 8 );
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}
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}
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}
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/****************/
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/* Encode signs */
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/****************/
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silk_encode_signs( psRangeEnc, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
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}
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