Chris@69: /***********************************************************************
Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69: Redistribution and use in source and binary forms, with or without
Chris@69: modification, are permitted provided that the following conditions
Chris@69: are met:
Chris@69: - Redistributions of source code must retain the above copyright notice,
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Chris@69: - Redistributions in binary form must reproduce the above copyright
Chris@69: notice, this list of conditions and the following disclaimer in the
Chris@69: documentation and/or other materials provided with the distribution.
Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69: names of specific contributors, may be used to endorse or promote
Chris@69: products derived from this software without specific prior written
Chris@69: permission.
Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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Chris@69: ***********************************************************************/
Chris@69: 
Chris@69: #ifndef SILK_RESAMPLER_PRIVATE_H
Chris@69: #define SILK_RESAMPLER_PRIVATE_H
Chris@69: 
Chris@69: #ifdef __cplusplus
Chris@69: extern "C" {
Chris@69: #endif
Chris@69: 
Chris@69: #include "SigProc_FIX.h"
Chris@69: #include "resampler_structs.h"
Chris@69: #include "resampler_rom.h"
Chris@69: 
Chris@69: /* Number of input samples to process in the inner loop */
Chris@69: #define RESAMPLER_MAX_BATCH_SIZE_MS             10
Chris@69: #define RESAMPLER_MAX_FS_KHZ                    48
Chris@69: #define RESAMPLER_MAX_BATCH_SIZE_IN             ( RESAMPLER_MAX_BATCH_SIZE_MS * RESAMPLER_MAX_FS_KHZ )
Chris@69: 
Chris@69: /* Description: Hybrid IIR/FIR polyphase implementation of resampling */
Chris@69: void silk_resampler_private_IIR_FIR(
Chris@69:     void                            *SS,            /* I/O  Resampler state             */
Chris@69:     opus_int16                      out[],          /* O    Output signal               */
Chris@69:     const opus_int16                in[],           /* I    Input signal                */
Chris@69:     opus_int32                      inLen           /* I    Number of input samples     */
Chris@69: );
Chris@69: 
Chris@69: /* Description: Hybrid IIR/FIR polyphase implementation of resampling */
Chris@69: void silk_resampler_private_down_FIR(
Chris@69:     void                            *SS,            /* I/O  Resampler state             */
Chris@69:     opus_int16                      out[],          /* O    Output signal               */
Chris@69:     const opus_int16                in[],           /* I    Input signal                */
Chris@69:     opus_int32                      inLen           /* I    Number of input samples     */
Chris@69: );
Chris@69: 
Chris@69: /* Upsample by a factor 2, high quality */
Chris@69: void silk_resampler_private_up2_HQ_wrapper(
Chris@69:     void                            *SS,            /* I/O  Resampler state (unused)    */
Chris@69:     opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
Chris@69:     const opus_int16                *in,            /* I    Input signal [ len ]        */
Chris@69:     opus_int32                      len             /* I    Number of input samples     */
Chris@69: );
Chris@69: 
Chris@69: /* Upsample by a factor 2, high quality */
Chris@69: void silk_resampler_private_up2_HQ(
Chris@69:     opus_int32                      *S,             /* I/O  Resampler state [ 6 ]       */
Chris@69:     opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
Chris@69:     const opus_int16                *in,            /* I    Input signal [ len ]        */
Chris@69:     opus_int32                      len             /* I    Number of input samples     */
Chris@69: );
Chris@69: 
Chris@69: /* Second order AR filter */
Chris@69: void silk_resampler_private_AR2(
Chris@69:     opus_int32                      S[],            /* I/O  State vector [ 2 ]          */
Chris@69:     opus_int32                      out_Q8[],       /* O    Output signal               */
Chris@69:     const opus_int16                in[],           /* I    Input signal                */
Chris@69:     const opus_int16                A_Q14[],        /* I    AR coefficients, Q14        */
Chris@69:     opus_int32                      len             /* I    Signal length               */
Chris@69: );
Chris@69: 
Chris@69: #ifdef __cplusplus
Chris@69: }
Chris@69: #endif
Chris@69: #endif /* SILK_RESAMPLER_PRIVATE_H */