101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
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/*
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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 "typedefs.h"
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#ifdef WEBRTC_BIG_ENDIAN
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#include "signal_processing_library.h"
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#endif
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#define HIGHEND 0xFF00
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#define LOWEND 0xFF
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/* Encoder with WebRtc_Word16 Output */
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WebRtc_Word16 WebRtcPcm16b_EncodeW16(WebRtc_Word16 *speechIn16b,
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WebRtc_Word16 len,
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WebRtc_Word16 *speechOut16b)
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{
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#ifdef WEBRTC_BIG_ENDIAN
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WEBRTC_SPL_MEMCPY_W16(speechOut16b, speechIn16b, len);
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#else
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int i;
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for (i=0;i<len;i++) {
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speechOut16b[i]=(((WebRtc_UWord16)speechIn16b[i])>>8)|((((WebRtc_UWord16)speechIn16b[i])<<8)&0xFF00);
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}
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#endif
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return(len<<1);
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}
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/* Encoder with char Output (old version) */
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WebRtc_Word16 WebRtcPcm16b_Encode(WebRtc_Word16 *speech16b,
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WebRtc_Word16 len,
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unsigned char *speech8b)
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{
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WebRtc_Word16 samples=len*2;
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WebRtc_Word16 pos;
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WebRtc_Word16 short1;
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WebRtc_Word16 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 WebRtc_Word16 Input instead of char when the WebRtc_Word16 Encoder is used */
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WebRtc_Word16 WebRtcPcm16b_DecodeW16(void *inst,
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WebRtc_Word16 *speechIn16b,
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WebRtc_Word16 len,
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WebRtc_Word16 *speechOut16b,
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WebRtc_Word16* speechType)
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{
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#ifdef WEBRTC_BIG_ENDIAN
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WEBRTC_SPL_MEMCPY_W8(speechOut16b, speechIn16b, ((len*sizeof(WebRtc_Word16)+1)>>1));
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#else
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int i;
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int samples=len>>1;
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for (i=0;i<samples;i++) {
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speechOut16b[i]=(((WebRtc_UWord16)speechIn16b[i])>>8)|(((WebRtc_UWord16)(speechIn16b[i]&0xFF))<<8);
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}
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#endif
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*speechType=1;
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return(len>>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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WebRtc_Word16 WebRtcPcm16b_Decode(unsigned char *speech8b,
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WebRtc_Word16 len,
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WebRtc_Word16 *speech16b)
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{
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WebRtc_Word16 samples=len>>1;
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WebRtc_Word16 pos;
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WebRtc_Word16 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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