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105 lines
2.9 KiB
C
105 lines
2.9 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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#include "pcm16b.h"
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#include <stdlib.h>
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#ifdef WEBRTC_ARCH_BIG_ENDIAN
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#include <string.h>
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#endif
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#include "typedefs.h"
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#define HIGHEND 0xFF00
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#define LOWEND 0xFF
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/* Encoder with int16_t Output */
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int16_t WebRtcPcm16b_EncodeW16(const int16_t* speechIn16b,
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int16_t length_samples,
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int16_t* speechOut16b)
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{
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#ifdef WEBRTC_ARCH_BIG_ENDIAN
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memcpy(speechOut16b, speechIn16b, length_samples * sizeof(int16_t));
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#else
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int i;
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for (i = 0; i < length_samples; i++) {
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speechOut16b[i]=(((uint16_t)speechIn16b[i])>>8)|((((uint16_t)speechIn16b[i])<<8)&0xFF00);
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}
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#endif
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return length_samples << 1;
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}
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/* Encoder with char Output (old version) */
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int16_t WebRtcPcm16b_Encode(int16_t *speech16b,
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int16_t len,
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unsigned char *speech8b)
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{
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int16_t samples=len*2;
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int16_t pos;
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int16_t short1;
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int16_t short2;
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for (pos=0;pos<len;pos++) {
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short1=HIGHEND & speech16b[pos];
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short2=LOWEND & speech16b[pos];
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short1=short1>>8;
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speech8b[pos*2]=(unsigned char) short1;
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speech8b[pos*2+1]=(unsigned char) short2;
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}
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return(samples);
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}
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/* Decoder with int16_t Input instead of char when the int16_t Encoder is used */
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int16_t WebRtcPcm16b_DecodeW16(void *inst,
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int16_t *speechIn16b,
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int16_t length_bytes,
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int16_t *speechOut16b,
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int16_t* speechType)
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{
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#ifdef WEBRTC_ARCH_BIG_ENDIAN
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memcpy(speechOut16b, speechIn16b, length_bytes);
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#else
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int i;
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int samples = length_bytes >> 1;
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for (i=0;i<samples;i++) {
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speechOut16b[i]=(((uint16_t)speechIn16b[i])>>8)|(((uint16_t)(speechIn16b[i]&0xFF))<<8);
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}
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#endif
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*speechType=1;
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// Avoid warning.
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(void)(inst = NULL);
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return length_bytes >> 1;
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}
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/* "old" version of the decoder that uses char as input (not used in NetEq any more) */
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int16_t WebRtcPcm16b_Decode(unsigned char *speech8b,
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int16_t len,
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int16_t *speech16b)
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{
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int16_t samples=len>>1;
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int16_t pos;
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int16_t shortval;
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for (pos=0;pos<samples;pos++) {
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shortval=((unsigned short) speech8b[pos*2]);
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shortval=(shortval<<8)&HIGHEND;
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shortval=shortval|(((unsigned short) speech8b[pos*2+1])&LOWEND);
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speech16b[pos]=shortval;
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}
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return(samples);
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}
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