9b7ec42403
Sync to commit bb4b6885a139644cf3ac14e7deda9f633ec2d93c
This brings in a bunch of optimizations to decode speed
and memory usage. Allocations are switched from using
the pseudostack to using the real stack. Enabled hacks
to reduce stack usage.
This should fix crashes on sansa clip, although some
files will not play due to failing allocations in the
codec buffer.
Speeds up decoding of the following test files:
H300 (cf) C200 (arm7tdmi) ipod classic (arm9e)
16 kbps (silk) 14.28 MHz 4.00 MHz 2.61 MHz
64 kbps (celt) 4.09 MHz 8.08 MHz 6.24 MHz
128 kbps (celt) 1.93 MHz 8.83 MHz 6.53 MHz
Change-Id: I851733a8a5824b61feb363a173091bc7e6629b58
115 lines
5.5 KiB
C
115 lines
5.5 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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/*********************************************/
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/* Decode quantization indices of excitation */
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/*********************************************/
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void silk_decode_pulses(
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ec_dec *psRangeDec, /* I/O Compressor data structure */
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opus_int16 pulses[], /* O Excitation signal */
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const opus_int signalType, /* I Sigtype */
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const opus_int quantOffsetType, /* I quantOffsetType */
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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, j, k, iter, abs_q, nLS, RateLevelIndex;
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opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ];
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opus_int16 *pulses_ptr;
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const opus_uint8 *cdf_ptr;
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/*********************/
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/* Decode rate level */
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/*********************/
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RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
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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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}
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/***************************************************/
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/* Sum-Weighted-Pulses Decoding */
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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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nLshifts[ i ] = 0;
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sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 );
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/* LSB indication */
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while( sum_pulses[ i ] == MAX_PULSES + 1 ) {
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nLshifts[ i ]++;
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/* When we've already got 10 LSBs, we shift the table to not allow (MAX_PULSES + 1) */
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sum_pulses[ i ] = ec_dec_icdf( psRangeDec,
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silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 );
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}
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}
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/***************************************************/
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/* Shell decoding */
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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_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] );
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} else {
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silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( pulses[0] ) );
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}
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}
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/***************************************************/
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/* LSB Decoding */
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/***************************************************/
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for( i = 0; i < iter; i++ ) {
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if( nLshifts[ i ] > 0 ) {
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nLS = nLshifts[ i ];
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pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ];
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for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
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abs_q = pulses_ptr[ k ];
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for( j = 0; j < nLS; j++ ) {
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abs_q = silk_LSHIFT( abs_q, 1 );
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abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 );
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}
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pulses_ptr[ k ] = abs_q;
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}
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/* Mark the number of pulses non-zero for sign decoding. */
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sum_pulses[ i ] |= nLS << 5;
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}
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}
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/****************************************/
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/* Decode and add signs to pulse signal */
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/****************************************/
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silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
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}
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