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 #ifndef ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H
18 #define ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H
19 
20 #include <stdbool.h>
21 
22 #include <tinyalsa/asoundlib.h>
23 
24 #define MAX_PROFILE_FORMATS         6  /* We long support the 5 standard formats defined
25                                         * in asound.h, so we just need this to be 1 more
26                                         * than that */
27 #define MAX_PROFILE_SAMPLE_RATES    14 /* this number needs to be 1 more than the number of
28                                         * sample rates in std_sample_rates[]
29                                         * (in alsa_device_profile.c) */
30 #define MAX_PROFILE_CHANNEL_COUNTS  9  /* this number need to be 1 more than the number of
31                                         * standard channel formats in std_channel_counts[]
32                                         * (in alsa_device_profile.c) */
33 
34 #define DEFAULT_SAMPLE_RATE         44100
35 #define DEFAULT_SAMPLE_FORMAT       PCM_FORMAT_S16_LE
36 #define DEFAULT_CHANNEL_COUNT       2
37 
38 typedef struct  {
39     int card;
40     int device;
41     int direction; /* PCM_OUT or PCM_IN */
42 
43     enum pcm_format formats[MAX_PROFILE_FORMATS];
44 
45     /* note that this list is sorted highest rate to lowest */
46     unsigned sample_rates[MAX_PROFILE_SAMPLE_RATES];
47 
48     unsigned channel_counts[MAX_PROFILE_CHANNEL_COUNTS];
49 
50     bool is_valid;
51 
52     /* read from the hardware device */
53     struct pcm_config default_config;
54 
55     unsigned min_period_size;
56     unsigned max_period_size;
57 
58     unsigned min_channel_count;
59     unsigned max_channel_count;
60 } alsa_device_profile;
61 
62 void profile_init(alsa_device_profile* profile, int direction);
63 bool profile_is_initialized(alsa_device_profile* profile);
64 bool profile_is_valid(alsa_device_profile* profile);
65 bool profile_is_cached_for(alsa_device_profile* profile, int card, int device);
66 void profile_decache(alsa_device_profile* profile);
67 
68 bool profile_read_device_info(alsa_device_profile* profile);
69 
70 /* Audio Config Strings Methods */
71 char * profile_get_sample_rate_strs(alsa_device_profile* profile);
72 char * profile_get_format_strs(alsa_device_profile* profile);
73 char * profile_get_channel_count_strs(alsa_device_profile* profile);
74 
75 /* Sample Rate Methods */
76 unsigned profile_get_default_sample_rate(alsa_device_profile* profile);
77 bool profile_is_sample_rate_valid(alsa_device_profile* profile, unsigned rate);
78 
79 /* Format Methods */
80 enum pcm_format profile_get_default_format(alsa_device_profile* profile);
81 bool profile_is_format_valid(alsa_device_profile* profile, enum pcm_format fmt);
82 
83 /* Channel Methods */
84 unsigned profile_get_default_channel_count(alsa_device_profile* profile);
85 unsigned profile_get_closest_channel_count(alsa_device_profile* profile, unsigned count);
86 bool profile_is_channel_count_valid(alsa_device_profile* profile, unsigned count);
87 
88 /* Utility */
89 unsigned profile_calc_min_period_size(alsa_device_profile* profile, unsigned sample_rate);
90 unsigned int profile_get_period_size(alsa_device_profile* profile, unsigned sample_rate);
91 
92 /* Debugging */
93 void profile_dump(const alsa_device_profile* profile, int fd);
94 
95 #endif /* ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H */
96