diff options
Diffstat (limited to 'thirdparty/opus/silk/stereo_LR_to_MS.c')
| -rw-r--r-- | thirdparty/opus/silk/stereo_LR_to_MS.c | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/thirdparty/opus/silk/stereo_LR_to_MS.c b/thirdparty/opus/silk/stereo_LR_to_MS.c deleted file mode 100644 index dda0298de2..0000000000 --- a/thirdparty/opus/silk/stereo_LR_to_MS.c +++ /dev/null @@ -1,229 +0,0 @@ -/*********************************************************************** -Copyright (c) 2006-2011, Skype Limited. All rights reserved. -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions -are met: -- Redistributions of source code must retain the above copyright notice, -this list of conditions and the following disclaimer. -- Redistributions in binary form must reproduce the above copyright -notice, this list of conditions and the following disclaimer in the -documentation and/or other materials provided with the distribution. -- Neither the name of Internet Society, IETF or IETF Trust, nor the -names of specific contributors, may be used to endorse or promote -products derived from this software without specific prior written -permission. -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" -AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE -LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN -CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) -ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -POSSIBILITY OF SUCH DAMAGE. -***********************************************************************/ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "main.h" -#include "stack_alloc.h" - -/* Convert Left/Right stereo signal to adaptive Mid/Side representation */ -void silk_stereo_LR_to_MS( - stereo_enc_state *state, /* I/O State */ - opus_int16 x1[], /* I/O Left input signal, becomes mid signal */ - opus_int16 x2[], /* I/O Right input signal, becomes side signal */ - opus_int8 ix[ 2 ][ 3 ], /* O Quantization indices */ - opus_int8 *mid_only_flag, /* O Flag: only mid signal coded */ - opus_int32 mid_side_rates_bps[], /* O Bitrates for mid and side signals */ - opus_int32 total_rate_bps, /* I Total bitrate */ - opus_int prev_speech_act_Q8, /* I Speech activity level in previous frame */ - opus_int toMono, /* I Last frame before a stereo->mono transition */ - opus_int fs_kHz, /* I Sample rate (kHz) */ - opus_int frame_length /* I Number of samples */ -) -{ - opus_int n, is10msFrame, denom_Q16, delta0_Q13, delta1_Q13; - opus_int32 sum, diff, smooth_coef_Q16, pred_Q13[ 2 ], pred0_Q13, pred1_Q13; - opus_int32 LP_ratio_Q14, HP_ratio_Q14, frac_Q16, frac_3_Q16, min_mid_rate_bps, width_Q14, w_Q24, deltaw_Q24; - VARDECL( opus_int16, side ); - VARDECL( opus_int16, LP_mid ); - VARDECL( opus_int16, HP_mid ); - VARDECL( opus_int16, LP_side ); - VARDECL( opus_int16, HP_side ); - opus_int16 *mid = &x1[ -2 ]; - SAVE_STACK; - - ALLOC( side, frame_length + 2, opus_int16 ); - /* Convert to basic mid/side signals */ - for( n = 0; n < frame_length + 2; n++ ) { - sum = x1[ n - 2 ] + (opus_int32)x2[ n - 2 ]; - diff = x1[ n - 2 ] - (opus_int32)x2[ n - 2 ]; - mid[ n ] = (opus_int16)silk_RSHIFT_ROUND( sum, 1 ); - side[ n ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( diff, 1 ) ); - } - - /* Buffering */ - silk_memcpy( mid, state->sMid, 2 * sizeof( opus_int16 ) ); - silk_memcpy( side, state->sSide, 2 * sizeof( opus_int16 ) ); - silk_memcpy( state->sMid, &mid[ frame_length ], 2 * sizeof( opus_int16 ) ); - silk_memcpy( state->sSide, &side[ frame_length ], 2 * sizeof( opus_int16 ) ); - - /* LP and HP filter mid signal */ - ALLOC( LP_mid, frame_length, opus_int16 ); - ALLOC( HP_mid, frame_length, opus_int16 ); - for( n = 0; n < frame_length; n++ ) { - sum = silk_RSHIFT_ROUND( silk_ADD_LSHIFT( mid[ n ] + (opus_int32)mid[ n + 2 ], mid[ n + 1 ], 1 ), 2 ); - LP_mid[ n ] = sum; - HP_mid[ n ] = mid[ n + 1 ] - sum; - } - - /* LP and HP filter side signal */ - ALLOC( LP_side, frame_length, opus_int16 ); - ALLOC( HP_side, frame_length, opus_int16 ); - for( n = 0; n < frame_length; n++ ) { - sum = silk_RSHIFT_ROUND( silk_ADD_LSHIFT( side[ n ] + (opus_int32)side[ n + 2 ], side[ n + 1 ], 1 ), 2 ); - LP_side[ n ] = sum; - HP_side[ n ] = side[ n + 1 ] - sum; - } - - /* Find energies and predictors */ - is10msFrame = frame_length == 10 * fs_kHz; - smooth_coef_Q16 = is10msFrame ? - SILK_FIX_CONST( STEREO_RATIO_SMOOTH_COEF / 2, 16 ) : - SILK_FIX_CONST( STEREO_RATIO_SMOOTH_COEF, 16 ); - smooth_coef_Q16 = silk_SMULWB( silk_SMULBB( prev_speech_act_Q8, prev_speech_act_Q8 ), smooth_coef_Q16 ); - - pred_Q13[ 0 ] = silk_stereo_find_predictor( &LP_ratio_Q14, LP_mid, LP_side, &state->mid_side_amp_Q0[ 0 ], frame_length, smooth_coef_Q16 ); - pred_Q13[ 1 ] = silk_stereo_find_predictor( &HP_ratio_Q14, HP_mid, HP_side, &state->mid_side_amp_Q0[ 2 ], frame_length, smooth_coef_Q16 ); - /* Ratio of the norms of residual and mid signals */ - frac_Q16 = silk_SMLABB( HP_ratio_Q14, LP_ratio_Q14, 3 ); - frac_Q16 = silk_min( frac_Q16, SILK_FIX_CONST( 1, 16 ) ); - - /* Determine bitrate distribution between mid and side, and possibly reduce stereo width */ - total_rate_bps -= is10msFrame ? 1200 : 600; /* Subtract approximate bitrate for coding stereo parameters */ - if( total_rate_bps < 1 ) { - total_rate_bps = 1; - } - min_mid_rate_bps = silk_SMLABB( 2000, fs_kHz, 900 ); - silk_assert( min_mid_rate_bps < 32767 ); - /* Default bitrate distribution: 8 parts for Mid and (5+3*frac) parts for Side. so: mid_rate = ( 8 / ( 13 + 3 * frac ) ) * total_ rate */ - frac_3_Q16 = silk_MUL( 3, frac_Q16 ); - mid_side_rates_bps[ 0 ] = silk_DIV32_varQ( total_rate_bps, SILK_FIX_CONST( 8 + 5, 16 ) + frac_3_Q16, 16+3 ); - /* If Mid bitrate below minimum, reduce stereo width */ - if( mid_side_rates_bps[ 0 ] < min_mid_rate_bps ) { - mid_side_rates_bps[ 0 ] = min_mid_rate_bps; - mid_side_rates_bps[ 1 ] = total_rate_bps - mid_side_rates_bps[ 0 ]; - /* width = 4 * ( 2 * side_rate - min_rate ) / ( ( 1 + 3 * frac ) * min_rate ) */ - width_Q14 = silk_DIV32_varQ( silk_LSHIFT( mid_side_rates_bps[ 1 ], 1 ) - min_mid_rate_bps, - silk_SMULWB( SILK_FIX_CONST( 1, 16 ) + frac_3_Q16, min_mid_rate_bps ), 14+2 ); - width_Q14 = silk_LIMIT( width_Q14, 0, SILK_FIX_CONST( 1, 14 ) ); - } else { - mid_side_rates_bps[ 1 ] = total_rate_bps - mid_side_rates_bps[ 0 ]; - width_Q14 = SILK_FIX_CONST( 1, 14 ); - } - - /* Smoother */ - state->smth_width_Q14 = (opus_int16)silk_SMLAWB( state->smth_width_Q14, width_Q14 - state->smth_width_Q14, smooth_coef_Q16 ); - - /* At very low bitrates or for inputs that are nearly amplitude panned, switch to panned-mono coding */ - *mid_only_flag = 0; - if( toMono ) { - /* Last frame before stereo->mono transition; collapse stereo width */ - width_Q14 = 0; - pred_Q13[ 0 ] = 0; - pred_Q13[ 1 ] = 0; - silk_stereo_quant_pred( pred_Q13, ix ); - } else if( state->width_prev_Q14 == 0 && - ( 8 * total_rate_bps < 13 * min_mid_rate_bps || silk_SMULWB( frac_Q16, state->smth_width_Q14 ) < SILK_FIX_CONST( 0.05, 14 ) ) ) - { - /* Code as panned-mono; previous frame already had zero width */ - /* Scale down and quantize predictors */ - pred_Q13[ 0 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 0 ] ), 14 ); - pred_Q13[ 1 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 1 ] ), 14 ); - silk_stereo_quant_pred( pred_Q13, ix ); - /* Collapse stereo width */ - width_Q14 = 0; - pred_Q13[ 0 ] = 0; - pred_Q13[ 1 ] = 0; - mid_side_rates_bps[ 0 ] = total_rate_bps; - mid_side_rates_bps[ 1 ] = 0; - *mid_only_flag = 1; - } else if( state->width_prev_Q14 != 0 && - ( 8 * total_rate_bps < 11 * min_mid_rate_bps || silk_SMULWB( frac_Q16, state->smth_width_Q14 ) < SILK_FIX_CONST( 0.02, 14 ) ) ) - { - /* Transition to zero-width stereo */ - /* Scale down and quantize predictors */ - pred_Q13[ 0 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 0 ] ), 14 ); - pred_Q13[ 1 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 1 ] ), 14 ); - silk_stereo_quant_pred( pred_Q13, ix ); - /* Collapse stereo width */ - width_Q14 = 0; - pred_Q13[ 0 ] = 0; - pred_Q13[ 1 ] = 0; - } else if( state->smth_width_Q14 > SILK_FIX_CONST( 0.95, 14 ) ) { - /* Full-width stereo coding */ - silk_stereo_quant_pred( pred_Q13, ix ); - width_Q14 = SILK_FIX_CONST( 1, 14 ); - } else { - /* Reduced-width stereo coding; scale down and quantize predictors */ - pred_Q13[ 0 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 0 ] ), 14 ); - pred_Q13[ 1 ] = silk_RSHIFT( silk_SMULBB( state->smth_width_Q14, pred_Q13[ 1 ] ), 14 ); - silk_stereo_quant_pred( pred_Q13, ix ); - width_Q14 = state->smth_width_Q14; - } - - /* Make sure to keep on encoding until the tapered output has been transmitted */ - if( *mid_only_flag == 1 ) { - state->silent_side_len += frame_length - STEREO_INTERP_LEN_MS * fs_kHz; - if( state->silent_side_len < LA_SHAPE_MS * fs_kHz ) { - *mid_only_flag = 0; - } else { - /* Limit to avoid wrapping around */ - state->silent_side_len = 10000; - } - } else { - state->silent_side_len = 0; - } - - if( *mid_only_flag == 0 && mid_side_rates_bps[ 1 ] < 1 ) { - mid_side_rates_bps[ 1 ] = 1; - mid_side_rates_bps[ 0 ] = silk_max_int( 1, total_rate_bps - mid_side_rates_bps[ 1 ]); - } - - /* Interpolate predictors and subtract prediction from side channel */ - pred0_Q13 = -state->pred_prev_Q13[ 0 ]; - pred1_Q13 = -state->pred_prev_Q13[ 1 ]; - w_Q24 = silk_LSHIFT( state->width_prev_Q14, 10 ); - denom_Q16 = silk_DIV32_16( (opus_int32)1 << 16, STEREO_INTERP_LEN_MS * fs_kHz ); - delta0_Q13 = -silk_RSHIFT_ROUND( silk_SMULBB( pred_Q13[ 0 ] - state->pred_prev_Q13[ 0 ], denom_Q16 ), 16 ); - delta1_Q13 = -silk_RSHIFT_ROUND( silk_SMULBB( pred_Q13[ 1 ] - state->pred_prev_Q13[ 1 ], denom_Q16 ), 16 ); - deltaw_Q24 = silk_LSHIFT( silk_SMULWB( width_Q14 - state->width_prev_Q14, denom_Q16 ), 10 ); - for( n = 0; n < STEREO_INTERP_LEN_MS * fs_kHz; n++ ) { - pred0_Q13 += delta0_Q13; - pred1_Q13 += delta1_Q13; - w_Q24 += deltaw_Q24; - sum = silk_LSHIFT( silk_ADD_LSHIFT( mid[ n ] + (opus_int32)mid[ n + 2 ], mid[ n + 1 ], 1 ), 9 ); /* Q11 */ - sum = silk_SMLAWB( silk_SMULWB( w_Q24, side[ n + 1 ] ), sum, pred0_Q13 ); /* Q8 */ - sum = silk_SMLAWB( sum, silk_LSHIFT( (opus_int32)mid[ n + 1 ], 11 ), pred1_Q13 ); /* Q8 */ - x2[ n - 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sum, 8 ) ); - } - - pred0_Q13 = -pred_Q13[ 0 ]; - pred1_Q13 = -pred_Q13[ 1 ]; - w_Q24 = silk_LSHIFT( width_Q14, 10 ); - for( n = STEREO_INTERP_LEN_MS * fs_kHz; n < frame_length; n++ ) { - sum = silk_LSHIFT( silk_ADD_LSHIFT( mid[ n ] + (opus_int32)mid[ n + 2 ], mid[ n + 1 ], 1 ), 9 ); /* Q11 */ - sum = silk_SMLAWB( silk_SMULWB( w_Q24, side[ n + 1 ] ), sum, pred0_Q13 ); /* Q8 */ - sum = silk_SMLAWB( sum, silk_LSHIFT( (opus_int32)mid[ n + 1 ], 11 ), pred1_Q13 ); /* Q8 */ - x2[ n - 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sum, 8 ) ); - } - state->pred_prev_Q13[ 0 ] = (opus_int16)pred_Q13[ 0 ]; - state->pred_prev_Q13[ 1 ] = (opus_int16)pred_Q13[ 1 ]; - state->width_prev_Q14 = (opus_int16)width_Q14; - RESTORE_STACK; -} |