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/*
* Copyright (C) 2019 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 _YUKAWA_AUDIO_HW_H_
#define _YUKAWA_AUDIO_HW_H_
#include <hardware/audio.h>
#include <tinyalsa/asoundlib.h>
#include "fir_filter.h"
#define PORT_HDMI 0
#define PORT_INTERNAL_SPEAKER 1
#define PORT_BUILTIN_MIC 3
#define MIXER_XML_PATH "/vendor/etc/mixer_paths.xml"
/* Minimum granularity - Arbitrary but small value */
#define CODEC_BASE_FRAME_COUNT 32
#define CHANNEL_STEREO 2
#ifdef AEC_HAL
#define NUM_AEC_REFERENCE_CHANNELS 1
#else
/* App AEC uses 2-channel reference */
#define NUM_AEC_REFERENCE_CHANNELS 2
#endif /* #ifdef AEC_HAL */
#define DEBUG_AEC 0
#define PCM_OPEN_RETRIES 100
#define PCM_OPEN_WAIT_TIME_MS 20
/* Capture codec parameters */
/* Set up a capture period of 32 ms:
* CAPTURE_PERIOD = PERIOD_SIZE / SAMPLE_RATE, so (32e-3) = PERIOD_SIZE / (16e3)
* => PERIOD_SIZE = 512 frames, where each "frame" consists of 1 sample of every channel (here, 2ch) */
#define CAPTURE_PERIOD_MULTIPLIER 16
#define CAPTURE_PERIOD_SIZE (CODEC_BASE_FRAME_COUNT * CAPTURE_PERIOD_MULTIPLIER)
#define CAPTURE_PERIOD_COUNT 4
#define CAPTURE_PERIOD_START_THRESHOLD 0
#define CAPTURE_CODEC_SAMPLING_RATE 16000
/* Playback codec parameters */
/* number of base blocks in a short period (low latency) */
#define PLAYBACK_PERIOD_MULTIPLIER 32 /* 21 ms */
/* number of frames per short period (low latency) */
#define PLAYBACK_PERIOD_SIZE (CODEC_BASE_FRAME_COUNT * PLAYBACK_PERIOD_MULTIPLIER)
/* number of pseudo periods for low latency playback */
#define PLAYBACK_PERIOD_COUNT 4
#define PLAYBACK_PERIOD_START_THRESHOLD 2
#define PLAYBACK_CODEC_SAMPLING_RATE 48000
#define MIN_WRITE_SLEEP_US 5000
#define SPEAKER_EQ_FILE "/vendor/etc/speaker_eq.fir"
#define SPEAKER_MAX_EQ_LENGTH 512
struct alsa_audio_device {
struct audio_hw_device hw_device;
pthread_mutex_t lock; /* see notes in in_read/out_write on mutex acquisition order */
struct alsa_stream_in *active_input;
struct alsa_stream_out *active_output;
struct audio_route *audio_route;
struct mixer *mixer;
bool mic_mute;
struct aec_t *aec;
};
struct alsa_stream_in {
struct audio_stream_in stream;
pthread_mutex_t lock; /* see note in in_read() on mutex acquisition order */
audio_devices_t devices;
struct pcm_config config;
struct pcm *pcm;
bool unavailable;
bool standby;
struct alsa_audio_device *dev;
int read_threshold;
unsigned int frames_read;
uint64_t timestamp_nsec;
audio_source_t source;
};
struct alsa_stream_out {
struct audio_stream_out stream;
pthread_mutex_t lock; /* see note in out_write() on mutex acquisition order */
audio_devices_t devices;
struct pcm_config config;
struct pcm *pcm;
bool unavailable;
int standby;
struct alsa_audio_device *dev;
int write_threshold;
unsigned int frames_written;
struct timespec timestamp;
fir_filter_t* speaker_eq;
};
/* 'bytes' are the number of bytes written to audio FIFO, for which 'timestamp' is valid.
* 'available' is the number of frames available to read (for input) or yet to be played
* (for output) frames in the PCM buffer.
* timestamp and available are updated by pcm_get_htimestamp(), so they use the same
* datatypes as the corresponding arguments to that function. */
struct aec_info {
struct timespec timestamp;
uint64_t timestamp_usec;
unsigned int available;
size_t bytes;
};
#endif /* #ifndef _YUKAWA_AUDIO_HW_H_ */