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:
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cannam@154: this list of conditions and the following disclaimer.
cannam@154: - Redistributions in binary form must reproduce the above copyright
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cannam@154: documentation and/or other materials provided with the distribution.
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cannam@154: names of specific contributors, may be used to endorse or promote
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cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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cannam@154: ***********************************************************************/
cannam@154: 
cannam@154: #ifndef SILK_RESAMPLER_PRIVATE_H
cannam@154: #define SILK_RESAMPLER_PRIVATE_H
cannam@154: 
cannam@154: #ifdef __cplusplus
cannam@154: extern "C" {
cannam@154: #endif
cannam@154: 
cannam@154: #include "SigProc_FIX.h"
cannam@154: #include "resampler_structs.h"
cannam@154: #include "resampler_rom.h"
cannam@154: 
cannam@154: /* Number of input samples to process in the inner loop */
cannam@154: #define RESAMPLER_MAX_BATCH_SIZE_MS             10
cannam@154: #define RESAMPLER_MAX_FS_KHZ                    48
cannam@154: #define RESAMPLER_MAX_BATCH_SIZE_IN             ( RESAMPLER_MAX_BATCH_SIZE_MS * RESAMPLER_MAX_FS_KHZ )
cannam@154: 
cannam@154: /* Description: Hybrid IIR/FIR polyphase implementation of resampling */
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: /* Description: Hybrid IIR/FIR polyphase implementation of resampling */
cannam@154: void silk_resampler_private_down_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: /* Upsample by a factor 2, high quality */
cannam@154: void silk_resampler_private_up2_HQ_wrapper(
cannam@154:     void                            *SS,            /* I/O  Resampler state (unused)    */
cannam@154:     opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
cannam@154:     const opus_int16                *in,            /* I    Input signal [ len ]        */
cannam@154:     opus_int32                      len             /* I    Number of input samples     */
cannam@154: );
cannam@154: 
cannam@154: /* Upsample by a factor 2, high quality */
cannam@154: void silk_resampler_private_up2_HQ(
cannam@154:     opus_int32                      *S,             /* I/O  Resampler state [ 6 ]       */
cannam@154:     opus_int16                      *out,           /* O    Output signal [ 2 * len ]   */
cannam@154:     const opus_int16                *in,            /* I    Input signal [ len ]        */
cannam@154:     opus_int32                      len             /* I    Number of input samples     */
cannam@154: );
cannam@154: 
cannam@154: /* Second order AR filter */
cannam@154: void silk_resampler_private_AR2(
cannam@154:     opus_int32                      S[],            /* I/O  State vector [ 2 ]          */
cannam@154:     opus_int32                      out_Q8[],       /* O    Output signal               */
cannam@154:     const opus_int16                in[],           /* I    Input signal                */
cannam@154:     const opus_int16                A_Q14[],        /* I    AR coefficients, Q14        */
cannam@154:     opus_int32                      len             /* I    Signal length               */
cannam@154: );
cannam@154: 
cannam@154: #ifdef __cplusplus
cannam@154: }
cannam@154: #endif
cannam@154: #endif /* SILK_RESAMPLER_PRIVATE_H */