1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /* This file contains shared utility functions to handle the tinyalsa
18 * implementation for Android internal audio, generally in the hardware layer.
19 * Some routines may log a fatal error on failure, as noted.
20 */
21
22 #ifndef ANDROID_AUDIO_ALSAOPS_H
23 #define ANDROID_AUDIO_ALSAOPS_H
24
25 #include <log/log.h>
26
27 #include <system/audio.h>
28 #include <tinyalsa/asoundlib.h>
29
30 __BEGIN_DECLS
31
32 /* Converts audio_format to pcm_format.
33 * Parameters:
34 * format the audio_format_t to convert
35 *
36 * Logs a fatal error if format is not a valid convertible audio_format_t.
37 */
pcm_format_from_audio_format(audio_format_t format)38 static inline enum pcm_format pcm_format_from_audio_format(audio_format_t format)
39 {
40 switch (format) {
41 #if HAVE_BIG_ENDIAN
42 case AUDIO_FORMAT_PCM_16_BIT:
43 return PCM_FORMAT_S16_BE;
44 case AUDIO_FORMAT_PCM_24_BIT_PACKED:
45 return PCM_FORMAT_S24_3BE;
46 case AUDIO_FORMAT_PCM_32_BIT:
47 return PCM_FORMAT_S32_BE;
48 case AUDIO_FORMAT_PCM_8_24_BIT:
49 return PCM_FORMAT_S24_BE;
50 #else
51 case AUDIO_FORMAT_PCM_16_BIT:
52 return PCM_FORMAT_S16_LE;
53 case AUDIO_FORMAT_PCM_24_BIT_PACKED:
54 return PCM_FORMAT_S24_3LE;
55 case AUDIO_FORMAT_PCM_32_BIT:
56 return PCM_FORMAT_S32_LE;
57 case AUDIO_FORMAT_PCM_8_24_BIT:
58 return PCM_FORMAT_S24_LE;
59 #endif
60 case AUDIO_FORMAT_PCM_FLOAT: /* there is no equivalent for float */
61 default:
62 LOG_ALWAYS_FATAL("pcm_format_from_audio_format: invalid audio format %#x", format);
63 return PCM_FORMAT_INVALID; /* doesn't get here, assert called above */
64 }
65 }
66
67 /* Converts pcm_format to audio_format.
68 * Parameters:
69 * format the pcm_format to convert
70 *
71 * Logs a fatal error if format is not a valid convertible pcm_format.
72 */
audio_format_from_pcm_format(enum pcm_format format)73 static inline audio_format_t audio_format_from_pcm_format(enum pcm_format format)
74 {
75 switch (format) {
76 #if HAVE_BIG_ENDIAN
77 case PCM_FORMAT_S16_BE:
78 return AUDIO_FORMAT_PCM_16_BIT;
79 case PCM_FORMAT_S24_3BE:
80 return AUDIO_FORMAT_PCM_24_BIT_PACKED;
81 case PCM_FORMAT_S24_BE:
82 return AUDIO_FORMAT_PCM_8_24_BIT;
83 case PCM_FORMAT_S32_BE:
84 return AUDIO_FORMAT_PCM_32_BIT;
85 #else
86 case PCM_FORMAT_S16_LE:
87 return AUDIO_FORMAT_PCM_16_BIT;
88 case PCM_FORMAT_S24_3LE:
89 return AUDIO_FORMAT_PCM_24_BIT_PACKED;
90 case PCM_FORMAT_S24_LE:
91 return AUDIO_FORMAT_PCM_8_24_BIT;
92 case PCM_FORMAT_S32_LE:
93 return AUDIO_FORMAT_PCM_32_BIT;
94 #endif
95 default:
96 LOG_ALWAYS_FATAL("audio_format_from_pcm_format: invalid pcm format %#x", format);
97 return AUDIO_FORMAT_INVALID; /* doesn't get here, assert called above */
98 }
99 }
100
101 __END_DECLS
102
103 #endif /* ANDROID_AUDIO_ALSAOPS_H */
104