2 * Copyright (C) 2014 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H
18 #define ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H
22 #include <tinyalsa/asoundlib.h>
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
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) */
34 #define DEFAULT_SAMPLE_RATE 44100
35 #define DEFAULT_SAMPLE_FORMAT PCM_FORMAT_S16_LE
36 #define DEFAULT_CHANNEL_COUNT 2
41 int direction; /* PCM_OUT or PCM_IN */
43 enum pcm_format formats[MAX_PROFILE_FORMATS];
45 /* note that this list is sorted highest rate to lowest */
46 unsigned sample_rates[MAX_PROFILE_SAMPLE_RATES];
48 unsigned channel_counts[MAX_PROFILE_CHANNEL_COUNTS];
52 /* read from the hardware device */
53 struct pcm_config default_config;
55 unsigned min_period_size;
56 unsigned max_period_size;
58 unsigned min_channel_count;
59 unsigned max_channel_count;
60 } alsa_device_profile;
62 void profile_init(alsa_device_profile* profile, int direction);
63 bool profile_is_initialized(const alsa_device_profile* profile);
64 bool profile_is_valid(const alsa_device_profile* profile);
65 bool profile_is_cached_for(const alsa_device_profile* profile, int card, int device);
66 void profile_decache(alsa_device_profile* profile);
68 bool profile_read_device_info(alsa_device_profile* profile);
70 /* Audio Config Strings Methods */
71 char * profile_get_sample_rate_strs(const alsa_device_profile* profile);
72 char * profile_get_format_strs(const alsa_device_profile* profile);
73 char * profile_get_channel_count_strs(const alsa_device_profile* profile);
75 /* Sample Rate Methods */
76 unsigned profile_get_default_sample_rate(const alsa_device_profile* profile);
77 bool profile_is_sample_rate_valid(const alsa_device_profile* profile, unsigned rate);
80 enum pcm_format profile_get_default_format(const alsa_device_profile* profile);
81 bool profile_is_format_valid(const alsa_device_profile* profile, enum pcm_format fmt);
84 unsigned profile_get_default_channel_count(const alsa_device_profile* profile);
85 unsigned profile_get_closest_channel_count(const alsa_device_profile* profile, unsigned count);
86 bool profile_is_channel_count_valid(const alsa_device_profile* profile, unsigned count);
89 unsigned profile_calc_min_period_size(const alsa_device_profile* profile, unsigned sample_rate);
90 unsigned int profile_get_period_size(const alsa_device_profile* profile, unsigned sample_rate);
93 void profile_dump(const alsa_device_profile* profile, int fd);
95 #endif /* ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H */