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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H
#define ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H
#include <tinyalsa/asoundlib.h>
#include "alsa_device_profile.h"
typedef struct {
const alsa_device_profile* profile;
struct pcm_config alsa_config;
struct pcm * pcm;
size_t frame_size; /* valid after proxy_prepare(), the frame size in bytes */
uint64_t transferred; /* the total frames transferred, not cleared on standby */
} alsa_device_proxy;
/* State */
int proxy_prepare(alsa_device_proxy * proxy, const alsa_device_profile * profile,
struct pcm_config * config);
int proxy_open(alsa_device_proxy * proxy);
void proxy_close(alsa_device_proxy * proxy);
int proxy_get_presentation_position(const alsa_device_proxy * proxy,
uint64_t *frames, struct timespec *timestamp);
int proxy_get_capture_position(const alsa_device_proxy * proxy,
int64_t *frames, int64_t *time);
/* Attributes */
unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy);
enum pcm_format proxy_get_format(const alsa_device_proxy * proxy);
unsigned proxy_get_channel_count(const alsa_device_proxy * proxy);
unsigned int proxy_get_period_size(const alsa_device_proxy * proxy);
unsigned proxy_get_latency(const alsa_device_proxy * proxy);
/*
* Scans the provided list of sample rates and finds the first one that works.
*
* returns the index of the first rate for which the ALSA device can be opened.
* return negative value if none work or an error occurs.
*/
int proxy_scan_rates(alsa_device_proxy * proxy, const unsigned sample_rates[]);
/* I/O */
int proxy_write(alsa_device_proxy * proxy, const void *data, unsigned int count);
int proxy_read(alsa_device_proxy * proxy, void *data, unsigned int count);
/* Debugging */
void proxy_dump(const alsa_device_proxy * proxy, int fd);
#endif /* ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H */