michael@0: /***********************************************************************
michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0: Redistribution and use in source and binary forms, with or without
michael@0: modification, are permitted provided that the following conditions
michael@0: are met:
michael@0: - Redistributions of source code must retain the above copyright notice,
michael@0: this list of conditions and the following disclaimer.
michael@0: - Redistributions in binary form must reproduce the above copyright
michael@0: notice, this list of conditions and the following disclaimer in the
michael@0: documentation and/or other materials provided with the distribution.
michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0: names of specific contributors, may be used to endorse or promote
michael@0: products derived from this software without specific prior written
michael@0: permission.
michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0: POSSIBILITY OF SUCH DAMAGE.
michael@0: ***********************************************************************/
michael@0: 
michael@0: #ifndef SILK_RESAMPLER_PRIVATE_H
michael@0: #define SILK_RESAMPLER_PRIVATE_H
michael@0: 
michael@0: #ifdef __cplusplus
michael@0: extern "C" {
michael@0: #endif
michael@0: 
michael@0: #include "SigProc_FIX.h"
michael@0: #include "resampler_structs.h"
michael@0: #include "resampler_rom.h"
michael@0: 
michael@0: /* Number of input samples to process in the inner loop */
michael@0: #define RESAMPLER_MAX_BATCH_SIZE_MS             10
michael@0: #define RESAMPLER_MAX_FS_KHZ                    48
michael@0: #define RESAMPLER_MAX_BATCH_SIZE_IN             ( RESAMPLER_MAX_BATCH_SIZE_MS * RESAMPLER_MAX_FS_KHZ )
michael@0: 
michael@0: /* Description: Hybrid IIR/FIR polyphase implementation of resampling */
michael@0: void silk_resampler_private_IIR_FIR(
michael@0:     void                            *SS,            /* I/O  Resampler state             */
michael@0:     opus_int16                      out[],          /* O    Output signal               */
michael@0:     const opus_int16                in[],           /* I    Input signal                */
michael@0:     opus_int32                      inLen           /* I    Number of input samples     */
michael@0: );
michael@0: 
michael@0: /* Description: Hybrid IIR/FIR polyphase implementation of resampling */
michael@0: void silk_resampler_private_down_FIR(
michael@0:     void                            *SS,            /* I/O  Resampler state             */
michael@0:     opus_int16                      out[],          /* O    Output signal               */
michael@0:     const opus_int16                in[],           /* I    Input signal                */
michael@0:     opus_int32                      inLen           /* I    Number of input samples     */
michael@0: );
michael@0: 
michael@0: /* Upsample by a factor 2, high quality */
michael@0: void silk_resampler_private_up2_HQ_wrapper(
michael@0:     void                            *SS,            /* I/O  Resampler state (unused)    */
michael@0:     opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
michael@0:     const opus_int16                *in,            /* I    Input signal [ len ]        */
michael@0:     opus_int32                      len             /* I    Number of input samples     */
michael@0: );
michael@0: 
michael@0: /* Upsample by a factor 2, high quality */
michael@0: void silk_resampler_private_up2_HQ(
michael@0:     opus_int32                      *S,             /* I/O  Resampler state [ 6 ]       */
michael@0:     opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
michael@0:     const opus_int16                *in,            /* I    Input signal [ len ]        */
michael@0:     opus_int32                      len             /* I    Number of input samples     */
michael@0: );
michael@0: 
michael@0: /* Second order AR filter */
michael@0: void silk_resampler_private_AR2(
michael@0:     opus_int32                      S[],            /* I/O  State vector [ 2 ]          */
michael@0:     opus_int32                      out_Q8[],       /* O    Output signal               */
michael@0:     const opus_int16                in[],           /* I    Input signal                */
michael@0:     const opus_int16                A_Q14[],        /* I    AR coefficients, Q14        */
michael@0:     opus_int32                      len             /* I    Signal length               */
michael@0: );
michael@0: 
michael@0: #ifdef __cplusplus
michael@0: }
michael@0: #endif
michael@0: #endif /* SILK_RESAMPLER_PRIVATE_H */