ref: f7479653be7649267fd9e2096adf47862cea1a95
dir: /src_common/SKP_Silk_encode_pulses.c/
/***********************************************************************
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are permitted provided that the following conditions are met:
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this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
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documentation and/or other materials provided with the distribution.
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this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#include "SKP_Silk_main.h"
/*********************************************/
/* Encode quantization indices of excitation */
/*********************************************/
SKP_INLINE SKP_int combine_and_check( /* return ok */
SKP_int *pulses_comb, /* O */
const SKP_int *pulses_in, /* I */
SKP_int max_pulses, /* I max value for sum of pulses */
SKP_int len /* I number of output values */
)
{
SKP_int k, sum;
for( k = 0; k < len; k++ ) {
sum = pulses_in[ 2 * k ] + pulses_in[ 2 * k + 1 ];
if( sum > max_pulses ) {
return 1;
}
pulses_comb[ k ] = sum;
}
return 0;
}
/* Encode quantization indices of excitation */
void SKP_Silk_encode_pulses(
ec_enc *psRangeEnc, /* I/O compressor data structure */
const SKP_int signalType, /* I Sigtype */
const SKP_int quantOffsetType, /* I quantOffsetType */
SKP_int8 pulses[], /* I quantization indices */
const SKP_int frame_length /* I Frame length */
)
{
SKP_int i, k, j, iter, bit, nLS, scale_down, RateLevelIndex = 0;
SKP_int32 abs_q, minSumBits_Q5, sumBits_Q5;
SKP_int abs_pulses[ MAX_FRAME_LENGTH ];
SKP_int sum_pulses[ MAX_NB_SHELL_BLOCKS ];
SKP_int nRshifts[ MAX_NB_SHELL_BLOCKS ];
SKP_int pulses_comb[ 8 ];
SKP_int *abs_pulses_ptr;
const SKP_int8 *pulses_ptr;
const SKP_uint8 *cdf_ptr;
const SKP_uint8 *nBits_ptr;
SKP_memset( pulses_comb, 0, 8 * sizeof( SKP_int ) ); // Fixing Valgrind reported problem
/****************************/
/* Prepare for shell coding */
/****************************/
/* Calculate number of shell blocks */
SKP_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
iter = SKP_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ){
SKP_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
iter++;
SKP_memset( &pulses[ frame_length ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof(SKP_int8));
}
/* Take the absolute value of the pulses */
for( i = 0; i < iter * SHELL_CODEC_FRAME_LENGTH; i+=4 ) {
abs_pulses[i+0] = ( SKP_int )SKP_abs( pulses[ i + 0 ] );
abs_pulses[i+1] = ( SKP_int )SKP_abs( pulses[ i + 1 ] );
abs_pulses[i+2] = ( SKP_int )SKP_abs( pulses[ i + 2 ] );
abs_pulses[i+3] = ( SKP_int )SKP_abs( pulses[ i + 3 ] );
}
/* Calc sum pulses per shell code frame */
abs_pulses_ptr = abs_pulses;
for( i = 0; i < iter; i++ ) {
nRshifts[ i ] = 0;
while( 1 ) {
/* 1+1 -> 2 */
scale_down = combine_and_check( pulses_comb, abs_pulses_ptr, SKP_Silk_max_pulses_table[ 0 ], 8 );
/* 2+2 -> 4 */
scale_down += combine_and_check( pulses_comb, pulses_comb, SKP_Silk_max_pulses_table[ 1 ], 4 );
/* 4+4 -> 8 */
scale_down += combine_and_check( pulses_comb, pulses_comb, SKP_Silk_max_pulses_table[ 2 ], 2 );
/* 8+8 -> 16 */
scale_down += combine_and_check( &sum_pulses[ i ], pulses_comb, SKP_Silk_max_pulses_table[ 3 ], 1 );
if( scale_down ) {
/* We need to downscale the quantization signal */
nRshifts[ i ]++;
for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
abs_pulses_ptr[ k ] = SKP_RSHIFT( abs_pulses_ptr[ k ], 1 );
}
} else {
/* Jump out of while(1) loop and go to next shell coding frame */
break;
}
}
abs_pulses_ptr += SHELL_CODEC_FRAME_LENGTH;
}
/**************/
/* Rate level */
/**************/
/* find rate level that leads to fewest bits for coding of pulses per block info */
minSumBits_Q5 = SKP_int32_MAX;
for( k = 0; k < N_RATE_LEVELS - 1; k++ ) {
nBits_ptr = SKP_Silk_pulses_per_block_BITS_Q5[ k ];
sumBits_Q5 = SKP_Silk_rate_levels_BITS_Q5[ signalType >> 1 ][ k ];
for( i = 0; i < iter; i++ ) {
if( nRshifts[ i ] > 0 ) {
sumBits_Q5 += nBits_ptr[ MAX_PULSES + 1 ];
} else {
sumBits_Q5 += nBits_ptr[ sum_pulses[ i ] ];
}
}
if( sumBits_Q5 < minSumBits_Q5 ) {
minSumBits_Q5 = sumBits_Q5;
RateLevelIndex = k;
}
}
ec_enc_icdf( psRangeEnc, RateLevelIndex, SKP_Silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
/***************************************************/
/* Sum-Weighted-Pulses Encoding */
/***************************************************/
cdf_ptr = SKP_Silk_pulses_per_block_iCDF[ RateLevelIndex ];
for( i = 0; i < iter; i++ ) {
if( nRshifts[ i ] == 0 ) {
ec_enc_icdf( psRangeEnc, sum_pulses[ i ], cdf_ptr, 8 );
} else {
ec_enc_icdf( psRangeEnc, MAX_PULSES + 1, cdf_ptr, 8 );
for( k = 0; k < nRshifts[ i ] - 1; k++ ) {
ec_enc_icdf( psRangeEnc, MAX_PULSES + 1, SKP_Silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
}
ec_enc_icdf( psRangeEnc, sum_pulses[ i ], SKP_Silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
}
}
/******************/
/* Shell Encoding */
/******************/
for( i = 0; i < iter; i++ ) {
if( sum_pulses[ i ] > 0 ) {
SKP_Silk_shell_encoder( psRangeEnc, &abs_pulses[ i * SHELL_CODEC_FRAME_LENGTH ] );
}
}
/****************/
/* LSB Encoding */
/****************/
for( i = 0; i < iter; i++ ) {
if( nRshifts[ i ] > 0 ) {
pulses_ptr = &pulses[ i * SHELL_CODEC_FRAME_LENGTH ];
nLS = nRshifts[ i ] - 1;
for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
abs_q = (SKP_int8)SKP_abs( pulses_ptr[ k ] );
for( j = nLS; j > 0; j-- ) {
bit = SKP_RSHIFT( abs_q, j ) & 1;
ec_enc_icdf( psRangeEnc, bit, SKP_Silk_lsb_iCDF, 8 );
}
bit = abs_q & 1;
ec_enc_icdf( psRangeEnc, bit, SKP_Silk_lsb_iCDF, 8 );
}
}
}
#if! USE_CELT_PVQ
/****************/
/* Encode signs */
/****************/
SKP_Silk_encode_signs( psRangeEnc, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
#endif
}