eas_audioconst.h revision e442bb7cd6a085b33a4dd52c0e20a157ada7feb1 
1/*----------------------------------------------------------------------------
2 *
3 * File:
4 * eas_audioconst.h
5 *
6 * Contents and purpose:
7 * Defines audio constants related to the sample rate, bit size, etc.
8 *
9 *
10 * Copyright Sonic Network Inc. 2005
11
12 * Licensed under the Apache License, Version 2.0 (the "License");
13 * you may not use this file except in compliance with the License.
14 * You may obtain a copy of the License at
15 *
16 *      http://www.apache.org/licenses/LICENSE-2.0
17 *
18 * Unless required by applicable law or agreed to in writing, software
19 * distributed under the License is distributed on an "AS IS" BASIS,
20 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
21 * See the License for the specific language governing permissions and
22 * limitations under the License.
23 *
24 *----------------------------------------------------------------------------
25 * Revision Control:
26 *   $Revision: 82 $
27 *   $Date: 2006-07-10 11:45:19 -0700 (Mon, 10 Jul 2006) $
28 *----------------------------------------------------------------------------
29*/
30
31#ifndef _EAS_AUDIOCONST_H
32#define _EAS_AUDIOCONST_H
33
34/*----------------------------------------------------------------------------
35 * These macros define the various characteristics of the defined sample rates
36 *----------------------------------------------------------------------------
37 * BUFFER_SIZE_IN_MONO_SAMPLES	size of buffer in samples
38 * _OUTPUT_SAMPLE_RATE			compiled output sample rate
39 * AUDIO_FRAME_LENGTH			length of an audio frame in 256ths of a millisecond
40 * SYNTH_UPDATE_PERIOD_IN_BITS	length of an audio frame (2^x samples)
41 *----------------------------------------------------------------------------
42*/
43
44#if	defined (_SAMPLE_RATE_8000)
45#define BUFFER_SIZE_IN_MONO_SAMPLES		32
46#define _OUTPUT_SAMPLE_RATE 			8000
47#define AUDIO_FRAME_LENGTH				1024
48#define SYNTH_UPDATE_PERIOD_IN_BITS		5
49
50#elif defined (_SAMPLE_RATE_16000)
51#define BUFFER_SIZE_IN_MONO_SAMPLES		64
52#define _OUTPUT_SAMPLE_RATE				16000
53#define AUDIO_FRAME_LENGTH				1024
54#define SYNTH_UPDATE_PERIOD_IN_BITS		6
55
56#elif defined (_SAMPLE_RATE_20000)
57#define BUFFER_SIZE_IN_MONO_SAMPLES		128
58#define _OUTPUT_SAMPLE_RATE				20000
59#define AUDIO_FRAME_LENGTH				1638
60#define SYNTH_UPDATE_PERIOD_IN_BITS		7
61
62#elif defined (_SAMPLE_RATE_22050)
63#define BUFFER_SIZE_IN_MONO_SAMPLES		128
64#define _OUTPUT_SAMPLE_RATE				22050
65#define AUDIO_FRAME_LENGTH				1486
66#define SYNTH_UPDATE_PERIOD_IN_BITS		7
67
68#elif defined (_SAMPLE_RATE_24000)
69#define BUFFER_SIZE_IN_MONO_SAMPLES		128
70#define _OUTPUT_SAMPLE_RATE				24000
71#define AUDIO_FRAME_LENGTH				1365
72#define SYNTH_UPDATE_PERIOD_IN_BITS		7
73
74#elif defined (_SAMPLE_RATE_32000)
75#define BUFFER_SIZE_IN_MONO_SAMPLES		128
76#define _OUTPUT_SAMPLE_RATE				32000
77#define AUDIO_FRAME_LENGTH				1024
78#define SYNTH_UPDATE_PERIOD_IN_BITS		7
79
80#elif defined (_SAMPLE_RATE_44100)
81#define BUFFER_SIZE_IN_MONO_SAMPLES		256
82#define _OUTPUT_SAMPLE_RATE				44100
83#define AUDIO_FRAME_LENGTH				1486
84#define SYNTH_UPDATE_PERIOD_IN_BITS		8
85
86#elif defined (_SAMPLE_RATE_48000)
87#define BUFFER_SIZE_IN_MONO_SAMPLES		256
88#define _OUTPUT_SAMPLE_RATE				48000
89#define AUDIO_FRAME_LENGTH				1365
90#define SYNTH_UPDATE_PERIOD_IN_BITS		8
91
92#else
93#error "_SAMPLE_RATE_XXXXX must be defined to valid rate"
94#endif
95
96#endif /* #ifndef _EAS_AUDIOCONST_H */
97
98