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69 lines
2.5 KiB
69 lines
2.5 KiB
7 months ago
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/*
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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_PROXY_H
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#define ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H
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#include <tinyalsa/asoundlib.h>
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#include "alsa_device_profile.h"
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typedef struct {
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const alsa_device_profile* profile;
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struct pcm_config alsa_config;
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struct pcm * pcm;
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size_t frame_size; /* valid after proxy_prepare(), the frame size in bytes */
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uint64_t transferred; /* the total frames transferred, not cleared on standby */
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} alsa_device_proxy;
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/* State */
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int proxy_prepare(alsa_device_proxy * proxy, const alsa_device_profile * profile,
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struct pcm_config * config);
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int proxy_open(alsa_device_proxy * proxy);
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void proxy_close(alsa_device_proxy * proxy);
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int proxy_get_presentation_position(const alsa_device_proxy * proxy,
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uint64_t *frames, struct timespec *timestamp);
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int proxy_get_capture_position(const alsa_device_proxy * proxy,
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int64_t *frames, int64_t *time);
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/* Attributes */
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unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy);
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enum pcm_format proxy_get_format(const alsa_device_proxy * proxy);
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unsigned proxy_get_channel_count(const alsa_device_proxy * proxy);
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unsigned int proxy_get_period_size(const alsa_device_proxy * proxy);
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unsigned proxy_get_latency(const alsa_device_proxy * proxy);
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/*
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* Scans the provided list of sample rates and finds the first one that works.
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*
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* returns the index of the first rate for which the ALSA device can be opened.
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* return negative value if none work or an error occurs.
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*/
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int proxy_scan_rates(alsa_device_proxy * proxy, const unsigned sample_rates[]);
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/* I/O */
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int proxy_write(alsa_device_proxy * proxy, const void *data, unsigned int count);
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int proxy_read(alsa_device_proxy * proxy, void *data, unsigned int count);
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/* Debugging */
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void proxy_dump(const alsa_device_proxy * proxy, int fd);
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#endif /* ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H */
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