d900e8bea8
BUG= R=mflodman@webrtc.org, tina.legrand@webrtc.org Review URL: https://webrtc-codereview.appspot.com/1760006 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4293 4adac7df-926f-26a2-2b94-8c16560cd09d
126 lines
3.5 KiB
C++
126 lines
3.5 KiB
C++
/*
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* Copyright (c) 2012 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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#include "webrtc/voice_engine/utility.h"
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#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
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#include "webrtc/modules/interface/module.h"
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#include "webrtc/system_wrappers/interface/trace.h"
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namespace webrtc
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{
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namespace voe
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{
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enum{kMaxTargetLen = 2*32*10}; // stereo 32KHz 10ms
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void Utility::MixWithSat(int16_t target[],
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int target_channel,
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const int16_t source[],
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int source_channel,
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int source_len)
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{
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assert((target_channel == 1) || (target_channel == 2));
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assert((source_channel == 1) || (source_channel == 2));
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assert(source_len <= kMaxTargetLen);
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if ((target_channel == 2) && (source_channel == 1))
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{
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// Convert source from mono to stereo.
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int32_t left = 0;
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int32_t right = 0;
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for (int i = 0; i < source_len; ++i) {
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left = source[i] + target[i*2];
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right = source[i] + target[i*2 + 1];
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target[i*2] = WebRtcSpl_SatW32ToW16(left);
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target[i*2 + 1] = WebRtcSpl_SatW32ToW16(right);
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}
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}
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else if ((target_channel == 1) && (source_channel == 2))
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{
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// Convert source from stereo to mono.
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int32_t temp = 0;
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for (int i = 0; i < source_len/2; ++i) {
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temp = ((source[i*2] + source[i*2 + 1])>>1) + target[i];
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target[i] = WebRtcSpl_SatW32ToW16(temp);
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}
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}
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else
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{
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int32_t temp = 0;
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for (int i = 0; i < source_len; ++i) {
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temp = source[i] + target[i];
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target[i] = WebRtcSpl_SatW32ToW16(temp);
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}
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}
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}
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void Utility::MixSubtractWithSat(int16_t target[],
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const int16_t source[],
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uint16_t len)
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{
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int32_t temp(0);
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for (int i = 0; i < len; i++)
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{
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temp = target[i] - source[i];
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if (temp > 32767)
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target[i] = 32767;
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else if (temp < -32768)
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target[i] = -32768;
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else
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target[i] = (int16_t) temp;
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}
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}
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void Utility::MixAndScaleWithSat(int16_t target[],
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const int16_t source[], float scale,
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uint16_t len)
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{
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int32_t temp(0);
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for (int i = 0; i < len; i++)
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{
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temp = (int32_t) (target[i] + scale * source[i]);
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if (temp > 32767)
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target[i] = 32767;
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else if (temp < -32768)
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target[i] = -32768;
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else
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target[i] = (int16_t) temp;
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}
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}
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void Utility::Scale(int16_t vector[], float scale, uint16_t len)
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{
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for (int i = 0; i < len; i++)
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{
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vector[i] = (int16_t) (scale * vector[i]);
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}
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}
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void Utility::ScaleWithSat(int16_t vector[], float scale,
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uint16_t len)
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{
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int32_t temp(0);
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for (int i = 0; i < len; i++)
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{
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temp = (int32_t) (scale * vector[i]);
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if (temp > 32767)
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vector[i] = 32767;
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else if (temp < -32768)
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vector[i] = -32768;
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else
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vector[i] = (int16_t) temp;
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}
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}
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} // namespace voe
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} // namespace webrtc
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