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98 lines
4.0 KiB
98 lines
4.0 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H
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#define ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H
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#include <stdbool.h>
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#include <system/audio.h>
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#include <tinyalsa/asoundlib.h>
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#define MAX_PROFILE_FORMATS 6 /* We long support the 5 standard formats defined
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* in asound.h, so we just need this to be 1 more
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* than that */
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#define MAX_PROFILE_SAMPLE_RATES 14 /* this number needs to be 1 more than the number of
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* sample rates in std_sample_rates[]
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* (in alsa_device_profile.c) */
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#define MAX_PROFILE_CHANNEL_COUNTS (FCC_LIMIT + 1)
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/* this number need to be 1 more than the number of
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* standard channel formats in std_channel_counts[]
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* (in alsa_device_profile.c) */
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#define DEFAULT_SAMPLE_RATE 44100
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#define DEFAULT_SAMPLE_FORMAT PCM_FORMAT_S16_LE
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#define DEFAULT_CHANNEL_COUNT 2
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typedef struct {
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int card;
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int device;
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int direction; /* PCM_OUT or PCM_IN */
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enum pcm_format formats[MAX_PROFILE_FORMATS];
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/* note that this list is sorted highest rate to lowest */
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unsigned sample_rates[MAX_PROFILE_SAMPLE_RATES];
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unsigned channel_counts[MAX_PROFILE_CHANNEL_COUNTS];
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bool is_valid;
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/* read from the hardware device */
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struct pcm_config default_config;
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unsigned min_period_size;
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unsigned max_period_size;
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unsigned min_channel_count;
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unsigned max_channel_count;
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} alsa_device_profile;
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void profile_init(alsa_device_profile* profile, int direction);
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bool profile_is_initialized(const alsa_device_profile* profile);
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bool profile_is_valid(const alsa_device_profile* profile);
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bool profile_is_cached_for(const alsa_device_profile* profile, int card, int device);
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void profile_decache(alsa_device_profile* profile);
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bool profile_read_device_info(alsa_device_profile* profile);
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/* Audio Config Strings Methods */
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char * profile_get_sample_rate_strs(const alsa_device_profile* profile);
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char * profile_get_format_strs(const alsa_device_profile* profile);
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char * profile_get_channel_count_strs(const alsa_device_profile* profile);
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/* Sample Rate Methods */
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unsigned profile_get_default_sample_rate(const alsa_device_profile* profile);
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unsigned profile_get_highest_sample_rate(const alsa_device_profile* profile);
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bool profile_is_sample_rate_valid(const alsa_device_profile* profile, unsigned rate);
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/* Format Methods */
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enum pcm_format profile_get_default_format(const alsa_device_profile* profile);
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bool profile_is_format_valid(const alsa_device_profile* profile, enum pcm_format fmt);
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/* Channel Methods */
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unsigned profile_get_default_channel_count(const alsa_device_profile* profile);
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unsigned profile_get_closest_channel_count(const alsa_device_profile* profile, unsigned count);
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bool profile_is_channel_count_valid(const alsa_device_profile* profile, unsigned count);
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/* Utility */
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unsigned profile_calc_min_period_size(const alsa_device_profile* profile, unsigned sample_rate);
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unsigned int profile_get_period_size(const alsa_device_profile* profile, unsigned sample_rate);
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/* Debugging */
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void profile_dump(const alsa_device_profile* profile, int fd);
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#endif /* ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROFILE_H */
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