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