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Diffstat (limited to 'audio/audio_hw.h')
| -rw-r--r-- | audio/audio_hw.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/audio/audio_hw.h b/audio/audio_hw.h new file mode 100644 index 0000000..2e45e02 --- /dev/null +++ b/audio/audio_hw.h @@ -0,0 +1,127 @@ +/* + * 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_ */ |