mirror of
https://github.com/danog/libtgvoip.git
synced 2024-12-12 09:09:38 +01:00
5caaaafa42
I'm now using the entire audio processing module from WebRTC as opposed to individual DSP algorithms pulled from there before. Seems to work better this way.
506 lines
16 KiB
C
506 lines
16 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*
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* This file contains the resampling functions for 22 kHz.
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* The description header can be found in signal_processing_library.h
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*
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*/
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#include "common_audio/signal_processing/include/signal_processing_library.h"
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#include "common_audio/signal_processing/resample_by_2_internal.h"
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// Declaration of internally used functions
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static void WebRtcSpl_32khzTo22khzIntToShort(const int32_t *In, int16_t *Out,
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int32_t K);
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void WebRtcSpl_32khzTo22khzIntToInt(const int32_t *In, int32_t *Out,
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int32_t K);
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// interpolation coefficients
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static const int16_t kCoefficients32To22[5][9] = {
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{127, -712, 2359, -6333, 23456, 16775, -3695, 945, -154},
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{-39, 230, -830, 2785, 32366, -2324, 760, -218, 38},
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{117, -663, 2222, -6133, 26634, 13070, -3174, 831, -137},
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{-77, 457, -1677, 5958, 31175, -4136, 1405, -408, 71},
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{ 98, -560, 1900, -5406, 29240, 9423, -2480, 663, -110}
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};
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//////////////////////
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// 22 kHz -> 16 kHz //
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//////////////////////
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// number of subblocks; options: 1, 2, 4, 5, 10
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#define SUB_BLOCKS_22_16 5
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// 22 -> 16 resampler
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void WebRtcSpl_Resample22khzTo16khz(const int16_t* in, int16_t* out,
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WebRtcSpl_State22khzTo16khz* state, int32_t* tmpmem)
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{
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int k;
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// process two blocks of 10/SUB_BLOCKS_22_16 ms (to reduce temp buffer size)
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for (k = 0; k < SUB_BLOCKS_22_16; k++)
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{
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///// 22 --> 44 /////
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// int16_t in[220/SUB_BLOCKS_22_16]
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// int32_t out[440/SUB_BLOCKS_22_16]
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/////
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WebRtcSpl_UpBy2ShortToInt(in, 220 / SUB_BLOCKS_22_16, tmpmem + 16, state->S_22_44);
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///// 44 --> 32 /////
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// int32_t in[440/SUB_BLOCKS_22_16]
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// int32_t out[320/SUB_BLOCKS_22_16]
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/////
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// copy state to and from input array
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tmpmem[8] = state->S_44_32[0];
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tmpmem[9] = state->S_44_32[1];
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tmpmem[10] = state->S_44_32[2];
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tmpmem[11] = state->S_44_32[3];
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tmpmem[12] = state->S_44_32[4];
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tmpmem[13] = state->S_44_32[5];
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tmpmem[14] = state->S_44_32[6];
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tmpmem[15] = state->S_44_32[7];
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state->S_44_32[0] = tmpmem[440 / SUB_BLOCKS_22_16 + 8];
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state->S_44_32[1] = tmpmem[440 / SUB_BLOCKS_22_16 + 9];
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state->S_44_32[2] = tmpmem[440 / SUB_BLOCKS_22_16 + 10];
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state->S_44_32[3] = tmpmem[440 / SUB_BLOCKS_22_16 + 11];
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state->S_44_32[4] = tmpmem[440 / SUB_BLOCKS_22_16 + 12];
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state->S_44_32[5] = tmpmem[440 / SUB_BLOCKS_22_16 + 13];
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state->S_44_32[6] = tmpmem[440 / SUB_BLOCKS_22_16 + 14];
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state->S_44_32[7] = tmpmem[440 / SUB_BLOCKS_22_16 + 15];
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WebRtcSpl_Resample44khzTo32khz(tmpmem + 8, tmpmem, 40 / SUB_BLOCKS_22_16);
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///// 32 --> 16 /////
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// int32_t in[320/SUB_BLOCKS_22_16]
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// int32_t out[160/SUB_BLOCKS_22_16]
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/////
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WebRtcSpl_DownBy2IntToShort(tmpmem, 320 / SUB_BLOCKS_22_16, out, state->S_32_16);
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// move input/output pointers 10/SUB_BLOCKS_22_16 ms seconds ahead
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in += 220 / SUB_BLOCKS_22_16;
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out += 160 / SUB_BLOCKS_22_16;
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}
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}
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// initialize state of 22 -> 16 resampler
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void WebRtcSpl_ResetResample22khzTo16khz(WebRtcSpl_State22khzTo16khz* state)
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{
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int k;
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for (k = 0; k < 8; k++)
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{
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state->S_22_44[k] = 0;
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state->S_44_32[k] = 0;
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state->S_32_16[k] = 0;
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}
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}
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//////////////////////
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// 16 kHz -> 22 kHz //
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//////////////////////
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// number of subblocks; options: 1, 2, 4, 5, 10
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#define SUB_BLOCKS_16_22 4
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// 16 -> 22 resampler
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void WebRtcSpl_Resample16khzTo22khz(const int16_t* in, int16_t* out,
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WebRtcSpl_State16khzTo22khz* state, int32_t* tmpmem)
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{
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int k;
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// process two blocks of 10/SUB_BLOCKS_16_22 ms (to reduce temp buffer size)
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for (k = 0; k < SUB_BLOCKS_16_22; k++)
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{
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///// 16 --> 32 /////
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// int16_t in[160/SUB_BLOCKS_16_22]
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// int32_t out[320/SUB_BLOCKS_16_22]
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/////
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WebRtcSpl_UpBy2ShortToInt(in, 160 / SUB_BLOCKS_16_22, tmpmem + 8, state->S_16_32);
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///// 32 --> 22 /////
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// int32_t in[320/SUB_BLOCKS_16_22]
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// int32_t out[220/SUB_BLOCKS_16_22]
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/////
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// copy state to and from input array
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tmpmem[0] = state->S_32_22[0];
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tmpmem[1] = state->S_32_22[1];
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tmpmem[2] = state->S_32_22[2];
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tmpmem[3] = state->S_32_22[3];
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tmpmem[4] = state->S_32_22[4];
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tmpmem[5] = state->S_32_22[5];
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tmpmem[6] = state->S_32_22[6];
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tmpmem[7] = state->S_32_22[7];
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state->S_32_22[0] = tmpmem[320 / SUB_BLOCKS_16_22];
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state->S_32_22[1] = tmpmem[320 / SUB_BLOCKS_16_22 + 1];
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state->S_32_22[2] = tmpmem[320 / SUB_BLOCKS_16_22 + 2];
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state->S_32_22[3] = tmpmem[320 / SUB_BLOCKS_16_22 + 3];
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state->S_32_22[4] = tmpmem[320 / SUB_BLOCKS_16_22 + 4];
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state->S_32_22[5] = tmpmem[320 / SUB_BLOCKS_16_22 + 5];
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state->S_32_22[6] = tmpmem[320 / SUB_BLOCKS_16_22 + 6];
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state->S_32_22[7] = tmpmem[320 / SUB_BLOCKS_16_22 + 7];
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WebRtcSpl_32khzTo22khzIntToShort(tmpmem, out, 20 / SUB_BLOCKS_16_22);
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// move input/output pointers 10/SUB_BLOCKS_16_22 ms seconds ahead
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in += 160 / SUB_BLOCKS_16_22;
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out += 220 / SUB_BLOCKS_16_22;
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}
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}
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// initialize state of 16 -> 22 resampler
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void WebRtcSpl_ResetResample16khzTo22khz(WebRtcSpl_State16khzTo22khz* state)
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{
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int k;
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for (k = 0; k < 8; k++)
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{
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state->S_16_32[k] = 0;
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state->S_32_22[k] = 0;
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}
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}
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//////////////////////
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// 22 kHz -> 8 kHz //
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//////////////////////
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// number of subblocks; options: 1, 2, 5, 10
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#define SUB_BLOCKS_22_8 2
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// 22 -> 8 resampler
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void WebRtcSpl_Resample22khzTo8khz(const int16_t* in, int16_t* out,
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WebRtcSpl_State22khzTo8khz* state, int32_t* tmpmem)
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{
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int k;
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// process two blocks of 10/SUB_BLOCKS_22_8 ms (to reduce temp buffer size)
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for (k = 0; k < SUB_BLOCKS_22_8; k++)
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{
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///// 22 --> 22 lowpass /////
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// int16_t in[220/SUB_BLOCKS_22_8]
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// int32_t out[220/SUB_BLOCKS_22_8]
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/////
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WebRtcSpl_LPBy2ShortToInt(in, 220 / SUB_BLOCKS_22_8, tmpmem + 16, state->S_22_22);
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///// 22 --> 16 /////
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// int32_t in[220/SUB_BLOCKS_22_8]
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// int32_t out[160/SUB_BLOCKS_22_8]
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/////
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// copy state to and from input array
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tmpmem[8] = state->S_22_16[0];
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tmpmem[9] = state->S_22_16[1];
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tmpmem[10] = state->S_22_16[2];
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tmpmem[11] = state->S_22_16[3];
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tmpmem[12] = state->S_22_16[4];
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tmpmem[13] = state->S_22_16[5];
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tmpmem[14] = state->S_22_16[6];
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tmpmem[15] = state->S_22_16[7];
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state->S_22_16[0] = tmpmem[220 / SUB_BLOCKS_22_8 + 8];
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state->S_22_16[1] = tmpmem[220 / SUB_BLOCKS_22_8 + 9];
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state->S_22_16[2] = tmpmem[220 / SUB_BLOCKS_22_8 + 10];
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state->S_22_16[3] = tmpmem[220 / SUB_BLOCKS_22_8 + 11];
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state->S_22_16[4] = tmpmem[220 / SUB_BLOCKS_22_8 + 12];
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state->S_22_16[5] = tmpmem[220 / SUB_BLOCKS_22_8 + 13];
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state->S_22_16[6] = tmpmem[220 / SUB_BLOCKS_22_8 + 14];
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state->S_22_16[7] = tmpmem[220 / SUB_BLOCKS_22_8 + 15];
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WebRtcSpl_Resample44khzTo32khz(tmpmem + 8, tmpmem, 20 / SUB_BLOCKS_22_8);
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///// 16 --> 8 /////
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// int32_t in[160/SUB_BLOCKS_22_8]
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// int32_t out[80/SUB_BLOCKS_22_8]
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/////
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WebRtcSpl_DownBy2IntToShort(tmpmem, 160 / SUB_BLOCKS_22_8, out, state->S_16_8);
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// move input/output pointers 10/SUB_BLOCKS_22_8 ms seconds ahead
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in += 220 / SUB_BLOCKS_22_8;
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out += 80 / SUB_BLOCKS_22_8;
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}
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}
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// initialize state of 22 -> 8 resampler
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void WebRtcSpl_ResetResample22khzTo8khz(WebRtcSpl_State22khzTo8khz* state)
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{
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int k;
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for (k = 0; k < 8; k++)
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{
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state->S_22_22[k] = 0;
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state->S_22_22[k + 8] = 0;
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state->S_22_16[k] = 0;
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state->S_16_8[k] = 0;
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}
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}
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//////////////////////
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// 8 kHz -> 22 kHz //
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//////////////////////
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// number of subblocks; options: 1, 2, 5, 10
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#define SUB_BLOCKS_8_22 2
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// 8 -> 22 resampler
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void WebRtcSpl_Resample8khzTo22khz(const int16_t* in, int16_t* out,
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WebRtcSpl_State8khzTo22khz* state, int32_t* tmpmem)
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{
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int k;
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// process two blocks of 10/SUB_BLOCKS_8_22 ms (to reduce temp buffer size)
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for (k = 0; k < SUB_BLOCKS_8_22; k++)
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{
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///// 8 --> 16 /////
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// int16_t in[80/SUB_BLOCKS_8_22]
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// int32_t out[160/SUB_BLOCKS_8_22]
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/////
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WebRtcSpl_UpBy2ShortToInt(in, 80 / SUB_BLOCKS_8_22, tmpmem + 18, state->S_8_16);
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///// 16 --> 11 /////
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// int32_t in[160/SUB_BLOCKS_8_22]
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// int32_t out[110/SUB_BLOCKS_8_22]
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/////
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// copy state to and from input array
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tmpmem[10] = state->S_16_11[0];
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tmpmem[11] = state->S_16_11[1];
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tmpmem[12] = state->S_16_11[2];
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tmpmem[13] = state->S_16_11[3];
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tmpmem[14] = state->S_16_11[4];
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tmpmem[15] = state->S_16_11[5];
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tmpmem[16] = state->S_16_11[6];
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tmpmem[17] = state->S_16_11[7];
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state->S_16_11[0] = tmpmem[160 / SUB_BLOCKS_8_22 + 10];
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state->S_16_11[1] = tmpmem[160 / SUB_BLOCKS_8_22 + 11];
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state->S_16_11[2] = tmpmem[160 / SUB_BLOCKS_8_22 + 12];
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state->S_16_11[3] = tmpmem[160 / SUB_BLOCKS_8_22 + 13];
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state->S_16_11[4] = tmpmem[160 / SUB_BLOCKS_8_22 + 14];
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state->S_16_11[5] = tmpmem[160 / SUB_BLOCKS_8_22 + 15];
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state->S_16_11[6] = tmpmem[160 / SUB_BLOCKS_8_22 + 16];
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state->S_16_11[7] = tmpmem[160 / SUB_BLOCKS_8_22 + 17];
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WebRtcSpl_32khzTo22khzIntToInt(tmpmem + 10, tmpmem, 10 / SUB_BLOCKS_8_22);
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///// 11 --> 22 /////
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// int32_t in[110/SUB_BLOCKS_8_22]
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// int16_t out[220/SUB_BLOCKS_8_22]
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/////
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WebRtcSpl_UpBy2IntToShort(tmpmem, 110 / SUB_BLOCKS_8_22, out, state->S_11_22);
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// move input/output pointers 10/SUB_BLOCKS_8_22 ms seconds ahead
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in += 80 / SUB_BLOCKS_8_22;
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out += 220 / SUB_BLOCKS_8_22;
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}
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}
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// initialize state of 8 -> 22 resampler
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void WebRtcSpl_ResetResample8khzTo22khz(WebRtcSpl_State8khzTo22khz* state)
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{
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int k;
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for (k = 0; k < 8; k++)
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{
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state->S_8_16[k] = 0;
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state->S_16_11[k] = 0;
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state->S_11_22[k] = 0;
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}
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}
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// compute two inner-products and store them to output array
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static void WebRtcSpl_DotProdIntToInt(const int32_t* in1, const int32_t* in2,
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const int16_t* coef_ptr, int32_t* out1,
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int32_t* out2)
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{
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int32_t tmp1 = 16384;
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int32_t tmp2 = 16384;
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int16_t coef;
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coef = coef_ptr[0];
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tmp1 += coef * in1[0];
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tmp2 += coef * in2[-0];
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coef = coef_ptr[1];
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tmp1 += coef * in1[1];
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tmp2 += coef * in2[-1];
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coef = coef_ptr[2];
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tmp1 += coef * in1[2];
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tmp2 += coef * in2[-2];
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coef = coef_ptr[3];
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tmp1 += coef * in1[3];
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tmp2 += coef * in2[-3];
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coef = coef_ptr[4];
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tmp1 += coef * in1[4];
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tmp2 += coef * in2[-4];
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coef = coef_ptr[5];
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tmp1 += coef * in1[5];
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tmp2 += coef * in2[-5];
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coef = coef_ptr[6];
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tmp1 += coef * in1[6];
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tmp2 += coef * in2[-6];
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coef = coef_ptr[7];
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tmp1 += coef * in1[7];
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tmp2 += coef * in2[-7];
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coef = coef_ptr[8];
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*out1 = tmp1 + coef * in1[8];
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*out2 = tmp2 + coef * in2[-8];
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}
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// compute two inner-products and store them to output array
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static void WebRtcSpl_DotProdIntToShort(const int32_t* in1, const int32_t* in2,
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const int16_t* coef_ptr, int16_t* out1,
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int16_t* out2)
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{
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int32_t tmp1 = 16384;
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int32_t tmp2 = 16384;
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int16_t coef;
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coef = coef_ptr[0];
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tmp1 += coef * in1[0];
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tmp2 += coef * in2[-0];
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coef = coef_ptr[1];
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tmp1 += coef * in1[1];
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tmp2 += coef * in2[-1];
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coef = coef_ptr[2];
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tmp1 += coef * in1[2];
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tmp2 += coef * in2[-2];
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coef = coef_ptr[3];
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tmp1 += coef * in1[3];
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tmp2 += coef * in2[-3];
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coef = coef_ptr[4];
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tmp1 += coef * in1[4];
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tmp2 += coef * in2[-4];
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coef = coef_ptr[5];
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tmp1 += coef * in1[5];
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tmp2 += coef * in2[-5];
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coef = coef_ptr[6];
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tmp1 += coef * in1[6];
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tmp2 += coef * in2[-6];
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coef = coef_ptr[7];
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tmp1 += coef * in1[7];
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tmp2 += coef * in2[-7];
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coef = coef_ptr[8];
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tmp1 += coef * in1[8];
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tmp2 += coef * in2[-8];
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// scale down, round and saturate
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tmp1 >>= 15;
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if (tmp1 > (int32_t)0x00007FFF)
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tmp1 = 0x00007FFF;
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if (tmp1 < (int32_t)0xFFFF8000)
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tmp1 = 0xFFFF8000;
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tmp2 >>= 15;
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if (tmp2 > (int32_t)0x00007FFF)
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tmp2 = 0x00007FFF;
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if (tmp2 < (int32_t)0xFFFF8000)
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tmp2 = 0xFFFF8000;
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*out1 = (int16_t)tmp1;
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*out2 = (int16_t)tmp2;
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}
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// Resampling ratio: 11/16
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// input: int32_t (normalized, not saturated) :: size 16 * K
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// output: int32_t (shifted 15 positions to the left, + offset 16384) :: size 11 * K
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// K: Number of blocks
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void WebRtcSpl_32khzTo22khzIntToInt(const int32_t* In,
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int32_t* Out,
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int32_t K)
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{
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/////////////////////////////////////////////////////////////
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// Filter operation:
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//
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// Perform resampling (16 input samples -> 11 output samples);
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// process in sub blocks of size 16 samples.
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int32_t m;
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for (m = 0; m < K; m++)
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{
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// first output sample
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Out[0] = ((int32_t)In[3] << 15) + (1 << 14);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToInt(&In[0], &In[22], kCoefficients32To22[0], &Out[1], &Out[10]);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToInt(&In[2], &In[20], kCoefficients32To22[1], &Out[2], &Out[9]);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToInt(&In[3], &In[19], kCoefficients32To22[2], &Out[3], &Out[8]);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToInt(&In[5], &In[17], kCoefficients32To22[3], &Out[4], &Out[7]);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToInt(&In[6], &In[16], kCoefficients32To22[4], &Out[5], &Out[6]);
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// update pointers
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In += 16;
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Out += 11;
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}
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}
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// Resampling ratio: 11/16
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// input: int32_t (normalized, not saturated) :: size 16 * K
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// output: int16_t (saturated) :: size 11 * K
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// K: Number of blocks
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void WebRtcSpl_32khzTo22khzIntToShort(const int32_t *In,
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int16_t *Out,
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int32_t K)
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{
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/////////////////////////////////////////////////////////////
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// Filter operation:
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//
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// Perform resampling (16 input samples -> 11 output samples);
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// process in sub blocks of size 16 samples.
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int32_t tmp;
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int32_t m;
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for (m = 0; m < K; m++)
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{
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// first output sample
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tmp = In[3];
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if (tmp > (int32_t)0x00007FFF)
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tmp = 0x00007FFF;
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if (tmp < (int32_t)0xFFFF8000)
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tmp = 0xFFFF8000;
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Out[0] = (int16_t)tmp;
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToShort(&In[0], &In[22], kCoefficients32To22[0], &Out[1], &Out[10]);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToShort(&In[2], &In[20], kCoefficients32To22[1], &Out[2], &Out[9]);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToShort(&In[3], &In[19], kCoefficients32To22[2], &Out[3], &Out[8]);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToShort(&In[5], &In[17], kCoefficients32To22[3], &Out[4], &Out[7]);
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// sum and accumulate filter coefficients and input samples
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WebRtcSpl_DotProdIntToShort(&In[6], &In[16], kCoefficients32To22[4], &Out[5], &Out[6]);
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// update pointers
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In += 16;
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Out += 11;
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}
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}
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