| /* |
| * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| |
| /* |
| * This file contains resampling functions between 48 kHz and nb/wb. |
| * The description header can be found in signal_processing_library.h |
| * |
| */ |
| |
| #include <string.h> |
| #include "signal_processing_library.h" |
| #include "resample_by_2_internal.h" |
| |
| //////////////////////////// |
| ///// 48 kHz -> 16 kHz ///// |
| //////////////////////////// |
| |
| // 48 -> 16 resampler |
| void WebRtcSpl_Resample48khzTo16khz(const WebRtc_Word16* in, WebRtc_Word16* out, |
| WebRtcSpl_State48khzTo16khz* state, WebRtc_Word32* tmpmem) |
| { |
| ///// 48 --> 48(LP) ///// |
| // WebRtc_Word16 in[480] |
| // WebRtc_Word32 out[480] |
| ///// |
| WebRtcSpl_LPBy2ShortToInt(in, 480, tmpmem + 16, state->S_48_48); |
| |
| ///// 48 --> 32 ///// |
| // WebRtc_Word32 in[480] |
| // WebRtc_Word32 out[320] |
| ///// |
| // copy state to and from input array |
| memcpy(tmpmem + 8, state->S_48_32, 8 * sizeof(WebRtc_Word32)); |
| memcpy(state->S_48_32, tmpmem + 488, 8 * sizeof(WebRtc_Word32)); |
| WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 160); |
| |
| ///// 32 --> 16 ///// |
| // WebRtc_Word32 in[320] |
| // WebRtc_Word16 out[160] |
| ///// |
| WebRtcSpl_DownBy2IntToShort(tmpmem, 320, out, state->S_32_16); |
| } |
| |
| // initialize state of 48 -> 16 resampler |
| void WebRtcSpl_ResetResample48khzTo16khz(WebRtcSpl_State48khzTo16khz* state) |
| { |
| memset(state->S_48_48, 0, 16 * sizeof(WebRtc_Word32)); |
| memset(state->S_48_32, 0, 8 * sizeof(WebRtc_Word32)); |
| memset(state->S_32_16, 0, 8 * sizeof(WebRtc_Word32)); |
| } |
| |
| //////////////////////////// |
| ///// 16 kHz -> 48 kHz ///// |
| //////////////////////////// |
| |
| // 16 -> 48 resampler |
| void WebRtcSpl_Resample16khzTo48khz(const WebRtc_Word16* in, WebRtc_Word16* out, |
| WebRtcSpl_State16khzTo48khz* state, WebRtc_Word32* tmpmem) |
| { |
| ///// 16 --> 32 ///// |
| // WebRtc_Word16 in[160] |
| // WebRtc_Word32 out[320] |
| ///// |
| WebRtcSpl_UpBy2ShortToInt(in, 160, tmpmem + 16, state->S_16_32); |
| |
| ///// 32 --> 24 ///// |
| // WebRtc_Word32 in[320] |
| // WebRtc_Word32 out[240] |
| // copy state to and from input array |
| ///// |
| memcpy(tmpmem + 8, state->S_32_24, 8 * sizeof(WebRtc_Word32)); |
| memcpy(state->S_32_24, tmpmem + 328, 8 * sizeof(WebRtc_Word32)); |
| WebRtcSpl_Resample32khzTo24khz(tmpmem + 8, tmpmem, 80); |
| |
| ///// 24 --> 48 ///// |
| // WebRtc_Word32 in[240] |
| // WebRtc_Word16 out[480] |
| ///// |
| WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48); |
| } |
| |
| // initialize state of 16 -> 48 resampler |
| void WebRtcSpl_ResetResample16khzTo48khz(WebRtcSpl_State16khzTo48khz* state) |
| { |
| memset(state->S_16_32, 0, 8 * sizeof(WebRtc_Word32)); |
| memset(state->S_32_24, 0, 8 * sizeof(WebRtc_Word32)); |
| memset(state->S_24_48, 0, 8 * sizeof(WebRtc_Word32)); |
| } |
| |
| //////////////////////////// |
| ///// 48 kHz -> 8 kHz ///// |
| //////////////////////////// |
| |
| // 48 -> 8 resampler |
| void WebRtcSpl_Resample48khzTo8khz(const WebRtc_Word16* in, WebRtc_Word16* out, |
| WebRtcSpl_State48khzTo8khz* state, WebRtc_Word32* tmpmem) |
| { |
| ///// 48 --> 24 ///// |
| // WebRtc_Word16 in[480] |
| // WebRtc_Word32 out[240] |
| ///// |
| WebRtcSpl_DownBy2ShortToInt(in, 480, tmpmem + 256, state->S_48_24); |
| |
| ///// 24 --> 24(LP) ///// |
| // WebRtc_Word32 in[240] |
| // WebRtc_Word32 out[240] |
| ///// |
| WebRtcSpl_LPBy2IntToInt(tmpmem + 256, 240, tmpmem + 16, state->S_24_24); |
| |
| ///// 24 --> 16 ///// |
| // WebRtc_Word32 in[240] |
| // WebRtc_Word32 out[160] |
| ///// |
| // copy state to and from input array |
| memcpy(tmpmem + 8, state->S_24_16, 8 * sizeof(WebRtc_Word32)); |
| memcpy(state->S_24_16, tmpmem + 248, 8 * sizeof(WebRtc_Word32)); |
| WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 80); |
| |
| ///// 16 --> 8 ///// |
| // WebRtc_Word32 in[160] |
| // WebRtc_Word16 out[80] |
| ///// |
| WebRtcSpl_DownBy2IntToShort(tmpmem, 160, out, state->S_16_8); |
| } |
| |
| // initialize state of 48 -> 8 resampler |
| void WebRtcSpl_ResetResample48khzTo8khz(WebRtcSpl_State48khzTo8khz* state) |
| { |
| memset(state->S_48_24, 0, 8 * sizeof(WebRtc_Word32)); |
| memset(state->S_24_24, 0, 16 * sizeof(WebRtc_Word32)); |
| memset(state->S_24_16, 0, 8 * sizeof(WebRtc_Word32)); |
| memset(state->S_16_8, 0, 8 * sizeof(WebRtc_Word32)); |
| } |
| |
| //////////////////////////// |
| ///// 8 kHz -> 48 kHz ///// |
| //////////////////////////// |
| |
| // 8 -> 48 resampler |
| void WebRtcSpl_Resample8khzTo48khz(const WebRtc_Word16* in, WebRtc_Word16* out, |
| WebRtcSpl_State8khzTo48khz* state, WebRtc_Word32* tmpmem) |
| { |
| ///// 8 --> 16 ///// |
| // WebRtc_Word16 in[80] |
| // WebRtc_Word32 out[160] |
| ///// |
| WebRtcSpl_UpBy2ShortToInt(in, 80, tmpmem + 264, state->S_8_16); |
| |
| ///// 16 --> 12 ///// |
| // WebRtc_Word32 in[160] |
| // WebRtc_Word32 out[120] |
| ///// |
| // copy state to and from input array |
| memcpy(tmpmem + 256, state->S_16_12, 8 * sizeof(WebRtc_Word32)); |
| memcpy(state->S_16_12, tmpmem + 416, 8 * sizeof(WebRtc_Word32)); |
| WebRtcSpl_Resample32khzTo24khz(tmpmem + 256, tmpmem + 240, 40); |
| |
| ///// 12 --> 24 ///// |
| // WebRtc_Word32 in[120] |
| // WebRtc_Word16 out[240] |
| ///// |
| WebRtcSpl_UpBy2IntToInt(tmpmem + 240, 120, tmpmem, state->S_12_24); |
| |
| ///// 24 --> 48 ///// |
| // WebRtc_Word32 in[240] |
| // WebRtc_Word16 out[480] |
| ///// |
| WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48); |
| } |
| |
| // initialize state of 8 -> 48 resampler |
| void WebRtcSpl_ResetResample8khzTo48khz(WebRtcSpl_State8khzTo48khz* state) |
| { |
| memset(state->S_8_16, 0, 8 * sizeof(WebRtc_Word32)); |
| memset(state->S_16_12, 0, 8 * sizeof(WebRtc_Word32)); |
| memset(state->S_12_24, 0, 8 * sizeof(WebRtc_Word32)); |
| memset(state->S_24_48, 0, 8 * sizeof(WebRtc_Word32)); |
| } |