1 /*
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11
12 #include "pcm16b.h"
13
14 #include <stdlib.h>
15 #ifdef WEBRTC_ARCH_BIG_ENDIAN
16 #include <string.h>
17 #endif
18
19 #include "webrtc/typedefs.h"
20
21 #define HIGHEND 0xFF00
22 #define LOWEND 0xFF
23
24
25
26 /* Encoder with int16_t Output */
WebRtcPcm16b_EncodeW16(const int16_t * speechIn16b,int16_t length_samples,int16_t * speechOut16b)27 int16_t WebRtcPcm16b_EncodeW16(const int16_t* speechIn16b,
28 int16_t length_samples,
29 int16_t* speechOut16b)
30 {
31 #ifdef WEBRTC_ARCH_BIG_ENDIAN
32 memcpy(speechOut16b, speechIn16b, length_samples * sizeof(int16_t));
33 #else
34 int i;
35 for (i = 0; i < length_samples; i++) {
36 speechOut16b[i]=(((uint16_t)speechIn16b[i])>>8)|((((uint16_t)speechIn16b[i])<<8)&0xFF00);
37 }
38 #endif
39 return length_samples << 1;
40 }
41
42
43 /* Encoder with char Output (old version) */
WebRtcPcm16b_Encode(int16_t * speech16b,int16_t len,unsigned char * speech8b)44 int16_t WebRtcPcm16b_Encode(int16_t *speech16b,
45 int16_t len,
46 unsigned char *speech8b)
47 {
48 int16_t samples=len*2;
49 int16_t pos;
50 int16_t short1;
51 int16_t short2;
52 for (pos=0;pos<len;pos++) {
53 short1=HIGHEND & speech16b[pos];
54 short2=LOWEND & speech16b[pos];
55 short1=short1>>8;
56 speech8b[pos*2]=(unsigned char) short1;
57 speech8b[pos*2+1]=(unsigned char) short2;
58 }
59 return(samples);
60 }
61
62
63 /* Decoder with int16_t Input instead of char when the int16_t Encoder is used */
WebRtcPcm16b_DecodeW16(void * inst,int16_t * speechIn16b,int16_t length_bytes,int16_t * speechOut16b,int16_t * speechType)64 int16_t WebRtcPcm16b_DecodeW16(void *inst,
65 int16_t *speechIn16b,
66 int16_t length_bytes,
67 int16_t *speechOut16b,
68 int16_t* speechType)
69 {
70 #ifdef WEBRTC_ARCH_BIG_ENDIAN
71 memcpy(speechOut16b, speechIn16b, length_bytes);
72 #else
73 int i;
74 int samples = length_bytes >> 1;
75
76 for (i=0;i<samples;i++) {
77 speechOut16b[i]=(((uint16_t)speechIn16b[i])>>8)|(((uint16_t)(speechIn16b[i]&0xFF))<<8);
78 }
79 #endif
80
81 *speechType=1;
82
83 // Avoid warning.
84 (void)(inst = NULL);
85
86 return length_bytes >> 1;
87 }
88
89 /* "old" version of the decoder that uses char as input (not used in NetEq any more) */
WebRtcPcm16b_Decode(unsigned char * speech8b,int16_t len,int16_t * speech16b)90 int16_t WebRtcPcm16b_Decode(unsigned char *speech8b,
91 int16_t len,
92 int16_t *speech16b)
93 {
94 int16_t samples=len>>1;
95 int16_t pos;
96 int16_t shortval;
97 for (pos=0;pos<samples;pos++) {
98 shortval=((unsigned short) speech8b[pos*2]);
99 shortval=(shortval<<8)&HIGHEND;
100 shortval=shortval|(((unsigned short) speech8b[pos*2+1])&LOWEND);
101 speech16b[pos]=shortval;
102 }
103 return(samples);
104 }
105