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      1 /*
      2  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 
     12 /*
     13  * This file contains resampling functions between 48 kHz and nb/wb.
     14  * The description header can be found in signal_processing_library.h
     15  *
     16  */
     17 
     18 #include <string.h>
     19 #include "signal_processing_library.h"
     20 #include "resample_by_2_internal.h"
     21 
     22 ////////////////////////////
     23 ///// 48 kHz -> 16 kHz /////
     24 ////////////////////////////
     25 
     26 // 48 -> 16 resampler
     27 void WebRtcSpl_Resample48khzTo16khz(const WebRtc_Word16* in, WebRtc_Word16* out,
     28                                     WebRtcSpl_State48khzTo16khz* state, WebRtc_Word32* tmpmem)
     29 {
     30     ///// 48 --> 48(LP) /////
     31     // WebRtc_Word16  in[480]
     32     // WebRtc_Word32 out[480]
     33     /////
     34     WebRtcSpl_LPBy2ShortToInt(in, 480, tmpmem + 16, state->S_48_48);
     35 
     36     ///// 48 --> 32 /////
     37     // WebRtc_Word32  in[480]
     38     // WebRtc_Word32 out[320]
     39     /////
     40     // copy state to and from input array
     41     memcpy(tmpmem + 8, state->S_48_32, 8 * sizeof(WebRtc_Word32));
     42     memcpy(state->S_48_32, tmpmem + 488, 8 * sizeof(WebRtc_Word32));
     43     WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 160);
     44 
     45     ///// 32 --> 16 /////
     46     // WebRtc_Word32  in[320]
     47     // WebRtc_Word16 out[160]
     48     /////
     49     WebRtcSpl_DownBy2IntToShort(tmpmem, 320, out, state->S_32_16);
     50 }
     51 
     52 // initialize state of 48 -> 16 resampler
     53 void WebRtcSpl_ResetResample48khzTo16khz(WebRtcSpl_State48khzTo16khz* state)
     54 {
     55     memset(state->S_48_48, 0, 16 * sizeof(WebRtc_Word32));
     56     memset(state->S_48_32, 0, 8 * sizeof(WebRtc_Word32));
     57     memset(state->S_32_16, 0, 8 * sizeof(WebRtc_Word32));
     58 }
     59 
     60 ////////////////////////////
     61 ///// 16 kHz -> 48 kHz /////
     62 ////////////////////////////
     63 
     64 // 16 -> 48 resampler
     65 void WebRtcSpl_Resample16khzTo48khz(const WebRtc_Word16* in, WebRtc_Word16* out,
     66                                     WebRtcSpl_State16khzTo48khz* state, WebRtc_Word32* tmpmem)
     67 {
     68     ///// 16 --> 32 /////
     69     // WebRtc_Word16  in[160]
     70     // WebRtc_Word32 out[320]
     71     /////
     72     WebRtcSpl_UpBy2ShortToInt(in, 160, tmpmem + 16, state->S_16_32);
     73 
     74     ///// 32 --> 24 /////
     75     // WebRtc_Word32  in[320]
     76     // WebRtc_Word32 out[240]
     77     // copy state to and from input array
     78     /////
     79     memcpy(tmpmem + 8, state->S_32_24, 8 * sizeof(WebRtc_Word32));
     80     memcpy(state->S_32_24, tmpmem + 328, 8 * sizeof(WebRtc_Word32));
     81     WebRtcSpl_Resample32khzTo24khz(tmpmem + 8, tmpmem, 80);
     82 
     83     ///// 24 --> 48 /////
     84     // WebRtc_Word32  in[240]
     85     // WebRtc_Word16 out[480]
     86     /////
     87     WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48);
     88 }
     89 
     90 // initialize state of 16 -> 48 resampler
     91 void WebRtcSpl_ResetResample16khzTo48khz(WebRtcSpl_State16khzTo48khz* state)
     92 {
     93     memset(state->S_16_32, 0, 8 * sizeof(WebRtc_Word32));
     94     memset(state->S_32_24, 0, 8 * sizeof(WebRtc_Word32));
     95     memset(state->S_24_48, 0, 8 * sizeof(WebRtc_Word32));
     96 }
     97 
     98 ////////////////////////////
     99 ///// 48 kHz ->  8 kHz /////
    100 ////////////////////////////
    101 
    102 // 48 -> 8 resampler
    103 void WebRtcSpl_Resample48khzTo8khz(const WebRtc_Word16* in, WebRtc_Word16* out,
    104                                    WebRtcSpl_State48khzTo8khz* state, WebRtc_Word32* tmpmem)
    105 {
    106     ///// 48 --> 24 /////
    107     // WebRtc_Word16  in[480]
    108     // WebRtc_Word32 out[240]
    109     /////
    110     WebRtcSpl_DownBy2ShortToInt(in, 480, tmpmem + 256, state->S_48_24);
    111 
    112     ///// 24 --> 24(LP) /////
    113     // WebRtc_Word32  in[240]
    114     // WebRtc_Word32 out[240]
    115     /////
    116     WebRtcSpl_LPBy2IntToInt(tmpmem + 256, 240, tmpmem + 16, state->S_24_24);
    117 
    118     ///// 24 --> 16 /////
    119     // WebRtc_Word32  in[240]
    120     // WebRtc_Word32 out[160]
    121     /////
    122     // copy state to and from input array
    123     memcpy(tmpmem + 8, state->S_24_16, 8 * sizeof(WebRtc_Word32));
    124     memcpy(state->S_24_16, tmpmem + 248, 8 * sizeof(WebRtc_Word32));
    125     WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 80);
    126 
    127     ///// 16 --> 8 /////
    128     // WebRtc_Word32  in[160]
    129     // WebRtc_Word16 out[80]
    130     /////
    131     WebRtcSpl_DownBy2IntToShort(tmpmem, 160, out, state->S_16_8);
    132 }
    133 
    134 // initialize state of 48 -> 8 resampler
    135 void WebRtcSpl_ResetResample48khzTo8khz(WebRtcSpl_State48khzTo8khz* state)
    136 {
    137     memset(state->S_48_24, 0, 8 * sizeof(WebRtc_Word32));
    138     memset(state->S_24_24, 0, 16 * sizeof(WebRtc_Word32));
    139     memset(state->S_24_16, 0, 8 * sizeof(WebRtc_Word32));
    140     memset(state->S_16_8, 0, 8 * sizeof(WebRtc_Word32));
    141 }
    142 
    143 ////////////////////////////
    144 /////  8 kHz -> 48 kHz /////
    145 ////////////////////////////
    146 
    147 // 8 -> 48 resampler
    148 void WebRtcSpl_Resample8khzTo48khz(const WebRtc_Word16* in, WebRtc_Word16* out,
    149                                    WebRtcSpl_State8khzTo48khz* state, WebRtc_Word32* tmpmem)
    150 {
    151     ///// 8 --> 16 /////
    152     // WebRtc_Word16  in[80]
    153     // WebRtc_Word32 out[160]
    154     /////
    155     WebRtcSpl_UpBy2ShortToInt(in, 80, tmpmem + 264, state->S_8_16);
    156 
    157     ///// 16 --> 12 /////
    158     // WebRtc_Word32  in[160]
    159     // WebRtc_Word32 out[120]
    160     /////
    161     // copy state to and from input array
    162     memcpy(tmpmem + 256, state->S_16_12, 8 * sizeof(WebRtc_Word32));
    163     memcpy(state->S_16_12, tmpmem + 416, 8 * sizeof(WebRtc_Word32));
    164     WebRtcSpl_Resample32khzTo24khz(tmpmem + 256, tmpmem + 240, 40);
    165 
    166     ///// 12 --> 24 /////
    167     // WebRtc_Word32  in[120]
    168     // WebRtc_Word16 out[240]
    169     /////
    170     WebRtcSpl_UpBy2IntToInt(tmpmem + 240, 120, tmpmem, state->S_12_24);
    171 
    172     ///// 24 --> 48 /////
    173     // WebRtc_Word32  in[240]
    174     // WebRtc_Word16 out[480]
    175     /////
    176     WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48);
    177 }
    178 
    179 // initialize state of 8 -> 48 resampler
    180 void WebRtcSpl_ResetResample8khzTo48khz(WebRtcSpl_State8khzTo48khz* state)
    181 {
    182     memset(state->S_8_16, 0, 8 * sizeof(WebRtc_Word32));
    183     memset(state->S_16_12, 0, 8 * sizeof(WebRtc_Word32));
    184     memset(state->S_12_24, 0, 8 * sizeof(WebRtc_Word32));
    185     memset(state->S_24_48, 0, 8 * sizeof(WebRtc_Word32));
    186 }
    187