Konsta
3ca268d760
* HDMI audio devices on Raspberry Pi use FORMAT_IEC958_SUBFRAME_LE which is not supported by tinyalsa used on Android. Use ALSA library and its virtual vc4 audio devices that use IEC958 plugin to manage the subframe conversion.
89 lines
3.5 KiB
C
89 lines
3.5 KiB
C
/*
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* Copyright (C) 2014 The Android Open Source Project
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* Copyright (C) 2025 KonstaKANG
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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 <alsa/asoundlib.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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snd_pcm_t * pcm_alsa;
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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, bool require_exact_match);
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int proxy_prepare_from_default_config(
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alsa_device_proxy * proxy, const alsa_device_profile * profile);
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int hdmi_proxy_prepare_from_default_config(
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alsa_device_proxy * proxy, const alsa_device_profile * profile);
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int proxy_open(alsa_device_proxy * proxy);
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int hdmi_proxy_open(alsa_device_proxy * proxy);
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void proxy_close(alsa_device_proxy * proxy);
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void hdmi_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 hdmi_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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int proxy_stop(alsa_device_proxy * proxy);
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int hdmi_proxy_stop(alsa_device_proxy * proxy);
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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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bool require_exact_match);
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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_write_with_retries(
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alsa_device_proxy * proxy, const void *data, unsigned int count, int tries);
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int hdmi_proxy_write_with_retries(
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alsa_device_proxy * proxy, const void *data, unsigned int count, int tries);
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int proxy_read(alsa_device_proxy * proxy, void *data, unsigned int count);
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int proxy_read_with_retries(
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alsa_device_proxy * proxy, void *data, unsigned int count, int tries);
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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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