2 * Copyright (C) 2014 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H
18 #define ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H
20 #include <tinyalsa/asoundlib.h>
22 #include "alsa_device_profile.h"
25 alsa_device_profile* profile;
27 struct pcm_config alsa_config;
31 size_t frame_size; /* valid after proxy_prepare(), the frame size in bytes */
32 uint64_t transferred; /* the total frames transferred, not cleared on standby */
37 int proxy_prepare(alsa_device_proxy * proxy, alsa_device_profile * profile,
38 struct pcm_config * config);
39 int proxy_open(alsa_device_proxy * proxy);
40 void proxy_close(alsa_device_proxy * proxy);
41 int proxy_get_presentation_position(const alsa_device_proxy * proxy,
42 uint64_t *frames, struct timespec *timestamp);
45 unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy);
46 enum pcm_format proxy_get_format(const alsa_device_proxy * proxy);
47 unsigned proxy_get_channel_count(const alsa_device_proxy * proxy);
48 unsigned int proxy_get_period_size(const alsa_device_proxy * proxy);
49 unsigned proxy_get_latency(const alsa_device_proxy * proxy);
52 * Scans the provided list of sample rates and finds the first one that works.
54 * returns the index of the first rate for which the ALSA device can be opened.
55 * return negative value if none work or an error occurs.
57 int proxy_scan_rates(alsa_device_proxy * proxy, unsigned sample_rates[]);
60 int proxy_write(alsa_device_proxy * proxy, const void *data, unsigned int count);
61 int proxy_read(const alsa_device_proxy * proxy, void *data, unsigned int count);
64 void proxy_dump(const alsa_device_proxy * proxy, int fd);
66 #endif /* ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H */