cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "SigProc_FIX.h" cannam@154: #include "resampler_private.h" cannam@154: #include "stack_alloc.h" cannam@154: cannam@154: static OPUS_INLINE opus_int16 *silk_resampler_private_IIR_FIR_INTERPOL( cannam@154: opus_int16 *out, cannam@154: opus_int16 *buf, cannam@154: opus_int32 max_index_Q16, cannam@154: opus_int32 index_increment_Q16 cannam@154: ) cannam@154: { cannam@154: opus_int32 index_Q16, res_Q15; cannam@154: opus_int16 *buf_ptr; cannam@154: opus_int32 table_index; cannam@154: cannam@154: /* Interpolate upsampled signal and store in output array */ cannam@154: for( index_Q16 = 0; index_Q16 < max_index_Q16; index_Q16 += index_increment_Q16 ) { cannam@154: table_index = silk_SMULWB( index_Q16 & 0xFFFF, 12 ); cannam@154: buf_ptr = &buf[ index_Q16 >> 16 ]; cannam@154: cannam@154: res_Q15 = silk_SMULBB( buf_ptr[ 0 ], silk_resampler_frac_FIR_12[ table_index ][ 0 ] ); cannam@154: res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 1 ], silk_resampler_frac_FIR_12[ table_index ][ 1 ] ); cannam@154: res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 2 ], silk_resampler_frac_FIR_12[ table_index ][ 2 ] ); cannam@154: res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 3 ], silk_resampler_frac_FIR_12[ table_index ][ 3 ] ); cannam@154: res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 4 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 3 ] ); cannam@154: res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 5 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 2 ] ); cannam@154: res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 6 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 1 ] ); cannam@154: res_Q15 = silk_SMLABB( res_Q15, buf_ptr[ 7 ], silk_resampler_frac_FIR_12[ 11 - table_index ][ 0 ] ); cannam@154: *out++ = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( res_Q15, 15 ) ); cannam@154: } cannam@154: return out; cannam@154: } cannam@154: /* Upsample using a combination of allpass-based 2x upsampling and FIR interpolation */ cannam@154: void silk_resampler_private_IIR_FIR( cannam@154: void *SS, /* I/O Resampler state */ cannam@154: opus_int16 out[], /* O Output signal */ cannam@154: const opus_int16 in[], /* I Input signal */ cannam@154: opus_int32 inLen /* I Number of input samples */ cannam@154: ) cannam@154: { cannam@154: silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS; cannam@154: opus_int32 nSamplesIn; cannam@154: opus_int32 max_index_Q16, index_increment_Q16; cannam@154: VARDECL( opus_int16, buf ); cannam@154: SAVE_STACK; cannam@154: cannam@154: ALLOC( buf, 2 * S->batchSize + RESAMPLER_ORDER_FIR_12, opus_int16 ); cannam@154: cannam@154: /* Copy buffered samples to start of buffer */ cannam@154: silk_memcpy( buf, S->sFIR.i16, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); cannam@154: cannam@154: /* Iterate over blocks of frameSizeIn input samples */ cannam@154: index_increment_Q16 = S->invRatio_Q16; cannam@154: while( 1 ) { cannam@154: nSamplesIn = silk_min( inLen, S->batchSize ); cannam@154: cannam@154: /* Upsample 2x */ cannam@154: silk_resampler_private_up2_HQ( S->sIIR, &buf[ RESAMPLER_ORDER_FIR_12 ], in, nSamplesIn ); cannam@154: cannam@154: max_index_Q16 = silk_LSHIFT32( nSamplesIn, 16 + 1 ); /* + 1 because 2x upsampling */ cannam@154: out = silk_resampler_private_IIR_FIR_INTERPOL( out, buf, max_index_Q16, index_increment_Q16 ); cannam@154: in += nSamplesIn; cannam@154: inLen -= nSamplesIn; cannam@154: cannam@154: if( inLen > 0 ) { cannam@154: /* More iterations to do; copy last part of filtered signal to beginning of buffer */ cannam@154: silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); cannam@154: } else { cannam@154: break; cannam@154: } cannam@154: } cannam@154: cannam@154: /* Copy last part of filtered signal to the state for the next call */ cannam@154: silk_memcpy( S->sFIR.i16, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) ); cannam@154: RESTORE_STACK; cannam@154: }