Konsta
a050911a8c
* 48000Hz sample rate is set for output devices in audio policy configuration. Set the same default sample rate for sanity though this should not get used for valid profiles.
102 lines
4.2 KiB
C
102 lines
4.2 KiB
C
/*
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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 48000
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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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#define DEFAULT_PERIOD_COUNT 4
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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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int extra_latency_ms; /* any extra latency in addition to the buffer */
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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_fill_builtin_device_info(alsa_device_profile* profile, struct pcm_config* config,
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unsigned buffer_frame_count);
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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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