1*a58d3d2aSXin Li /*********************************************************************** 2*a58d3d2aSXin Li Copyright (c) 2006-2011, Skype Limited. All rights reserved. 3*a58d3d2aSXin Li Redistribution and use in source and binary forms, with or without 4*a58d3d2aSXin Li modification, are permitted provided that the following conditions 5*a58d3d2aSXin Li are met: 6*a58d3d2aSXin Li - Redistributions of source code must retain the above copyright notice, 7*a58d3d2aSXin Li this list of conditions and the following disclaimer. 8*a58d3d2aSXin Li - Redistributions in binary form must reproduce the above copyright 9*a58d3d2aSXin Li notice, this list of conditions and the following disclaimer in the 10*a58d3d2aSXin Li documentation and/or other materials provided with the distribution. 11*a58d3d2aSXin Li - Neither the name of Internet Society, IETF or IETF Trust, nor the 12*a58d3d2aSXin Li names of specific contributors, may be used to endorse or promote 13*a58d3d2aSXin Li products derived from this software without specific prior written 14*a58d3d2aSXin Li permission. 15*a58d3d2aSXin Li THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16*a58d3d2aSXin Li AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17*a58d3d2aSXin Li IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18*a58d3d2aSXin Li ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19*a58d3d2aSXin Li LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20*a58d3d2aSXin Li CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21*a58d3d2aSXin Li SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22*a58d3d2aSXin Li INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23*a58d3d2aSXin Li CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24*a58d3d2aSXin Li ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25*a58d3d2aSXin Li POSSIBILITY OF SUCH DAMAGE. 26*a58d3d2aSXin Li ***********************************************************************/ 27*a58d3d2aSXin Li 28*a58d3d2aSXin Li #ifndef SILK_RESAMPLER_PRIVATE_H 29*a58d3d2aSXin Li #define SILK_RESAMPLER_PRIVATE_H 30*a58d3d2aSXin Li 31*a58d3d2aSXin Li #ifdef __cplusplus 32*a58d3d2aSXin Li extern "C" { 33*a58d3d2aSXin Li #endif 34*a58d3d2aSXin Li 35*a58d3d2aSXin Li #include "SigProc_FIX.h" 36*a58d3d2aSXin Li #include "resampler_structs.h" 37*a58d3d2aSXin Li #include "resampler_rom.h" 38*a58d3d2aSXin Li 39*a58d3d2aSXin Li /* Number of input samples to process in the inner loop */ 40*a58d3d2aSXin Li #define RESAMPLER_MAX_BATCH_SIZE_MS 10 41*a58d3d2aSXin Li #define RESAMPLER_MAX_FS_KHZ 48 42*a58d3d2aSXin Li #define RESAMPLER_MAX_BATCH_SIZE_IN ( RESAMPLER_MAX_BATCH_SIZE_MS * RESAMPLER_MAX_FS_KHZ ) 43*a58d3d2aSXin Li 44*a58d3d2aSXin Li /* Description: Hybrid IIR/FIR polyphase implementation of resampling */ 45*a58d3d2aSXin Li void silk_resampler_private_IIR_FIR( 46*a58d3d2aSXin Li void *SS, /* I/O Resampler state */ 47*a58d3d2aSXin Li opus_int16 out[], /* O Output signal */ 48*a58d3d2aSXin Li const opus_int16 in[], /* I Input signal */ 49*a58d3d2aSXin Li opus_int32 inLen /* I Number of input samples */ 50*a58d3d2aSXin Li ); 51*a58d3d2aSXin Li 52*a58d3d2aSXin Li /* Description: Hybrid IIR/FIR polyphase implementation of resampling */ 53*a58d3d2aSXin Li void silk_resampler_private_down_FIR( 54*a58d3d2aSXin Li void *SS, /* I/O Resampler state */ 55*a58d3d2aSXin Li opus_int16 out[], /* O Output signal */ 56*a58d3d2aSXin Li const opus_int16 in[], /* I Input signal */ 57*a58d3d2aSXin Li opus_int32 inLen /* I Number of input samples */ 58*a58d3d2aSXin Li ); 59*a58d3d2aSXin Li 60*a58d3d2aSXin Li /* Upsample by a factor 2, high quality */ 61*a58d3d2aSXin Li void silk_resampler_private_up2_HQ_wrapper( 62*a58d3d2aSXin Li void *SS, /* I/O Resampler state (unused) */ 63*a58d3d2aSXin Li opus_int16 *out, /* O Output signal [ 2 * len ] */ 64*a58d3d2aSXin Li const opus_int16 *in, /* I Input signal [ len ] */ 65*a58d3d2aSXin Li opus_int32 len /* I Number of input samples */ 66*a58d3d2aSXin Li ); 67*a58d3d2aSXin Li 68*a58d3d2aSXin Li /* Upsample by a factor 2, high quality */ 69*a58d3d2aSXin Li void silk_resampler_private_up2_HQ( 70*a58d3d2aSXin Li opus_int32 *S, /* I/O Resampler state [ 6 ] */ 71*a58d3d2aSXin Li opus_int16 *out, /* O Output signal [ 2 * len ] */ 72*a58d3d2aSXin Li const opus_int16 *in, /* I Input signal [ len ] */ 73*a58d3d2aSXin Li opus_int32 len /* I Number of input samples */ 74*a58d3d2aSXin Li ); 75*a58d3d2aSXin Li 76*a58d3d2aSXin Li /* Second order AR filter */ 77*a58d3d2aSXin Li void silk_resampler_private_AR2( 78*a58d3d2aSXin Li opus_int32 S[], /* I/O State vector [ 2 ] */ 79*a58d3d2aSXin Li opus_int32 out_Q8[], /* O Output signal */ 80*a58d3d2aSXin Li const opus_int16 in[], /* I Input signal */ 81*a58d3d2aSXin Li const opus_int16 A_Q14[], /* I AR coefficients, Q14 */ 82*a58d3d2aSXin Li opus_int32 len /* I Signal length */ 83*a58d3d2aSXin Li ); 84*a58d3d2aSXin Li 85*a58d3d2aSXin Li #ifdef __cplusplus 86*a58d3d2aSXin Li } 87*a58d3d2aSXin Li #endif 88*a58d3d2aSXin Li #endif /* SILK_RESAMPLER_PRIVATE_H */ 89