1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17 #ifndef _YUKAWA_AUDIO_HW_H_ 18 #define _YUKAWA_AUDIO_HW_H_ 19 20 #include <hardware/audio.h> 21 #include <tinyalsa/asoundlib.h> 22 23 #define CARD_OUT 0 24 #define PORT_HDMI 0 25 #define PORT_INTERNAL_SPEAKER 1 26 #define CARD_IN 0 27 #define PORT_BUILTIN_MIC 3 28 29 #define MIXER_XML_PATH "/vendor/etc/mixer_paths.xml" 30 /* Minimum granularity - Arbitrary but small value */ 31 #define CODEC_BASE_FRAME_COUNT 32 32 33 #define CHANNEL_STEREO 2 34 35 #ifdef AEC_HAL 36 #define NUM_AEC_REFERENCE_CHANNELS 1 37 #else 38 /* App AEC uses 2-channel reference */ 39 #define NUM_AEC_REFERENCE_CHANNELS 2 40 #endif /* #ifdef AEC_HAL */ 41 42 #define DEBUG_AEC 0 43 44 #define PCM_OPEN_RETRIES 100 45 #define PCM_OPEN_WAIT_TIME_MS 20 46 47 /* Capture codec parameters */ 48 /* Set up a capture period of 32 ms: 49 * CAPTURE_PERIOD = PERIOD_SIZE / SAMPLE_RATE, so (32e-3) = PERIOD_SIZE / (16e3) 50 * => PERIOD_SIZE = 512 frames, where each "frame" consists of 1 sample of every channel (here, 2ch) */ 51 #define CAPTURE_PERIOD_MULTIPLIER 16 52 #define CAPTURE_PERIOD_SIZE (CODEC_BASE_FRAME_COUNT * CAPTURE_PERIOD_MULTIPLIER) 53 #define CAPTURE_PERIOD_COUNT 4 54 #define CAPTURE_PERIOD_START_THRESHOLD 0 55 #define CAPTURE_CODEC_SAMPLING_RATE 16000 56 57 /* Playback codec parameters */ 58 /* number of base blocks in a short period (low latency) */ 59 #define PLAYBACK_PERIOD_MULTIPLIER 32 /* 21 ms */ 60 /* number of frames per short period (low latency) */ 61 #define PLAYBACK_PERIOD_SIZE (CODEC_BASE_FRAME_COUNT * PLAYBACK_PERIOD_MULTIPLIER) 62 /* number of pseudo periods for low latency playback */ 63 #define PLAYBACK_PERIOD_COUNT 4 64 #define PLAYBACK_PERIOD_START_THRESHOLD 2 65 #define PLAYBACK_CODEC_SAMPLING_RATE 48000 66 #define MIN_WRITE_SLEEP_US 5000 67 68 struct alsa_audio_device { 69 struct audio_hw_device hw_device; 70 71 pthread_mutex_t lock; /* see notes in in_read/out_write on mutex acquisition order */ 72 struct alsa_stream_in *active_input; 73 struct alsa_stream_out *active_output; 74 struct audio_route *audio_route; 75 struct mixer *mixer; 76 bool mic_mute; 77 struct aec_t *aec; 78 }; 79 80 struct alsa_stream_in { 81 struct audio_stream_in stream; 82 83 pthread_mutex_t lock; /* see note in in_read() on mutex acquisition order */ 84 audio_devices_t devices; 85 struct pcm_config config; 86 struct pcm *pcm; 87 bool unavailable; 88 bool standby; 89 struct alsa_audio_device *dev; 90 int read_threshold; 91 unsigned int frames_read; 92 uint64_t timestamp_nsec; 93 audio_source_t source; 94 }; 95 96 struct alsa_stream_out { 97 struct audio_stream_out stream; 98 99 pthread_mutex_t lock; /* see note in out_write() on mutex acquisition order */ 100 audio_devices_t devices; 101 struct pcm_config config; 102 struct pcm *pcm; 103 bool unavailable; 104 int standby; 105 struct alsa_audio_device *dev; 106 int write_threshold; 107 unsigned int frames_written; 108 struct timespec timestamp; 109 }; 110 111 /* 'bytes' are the number of bytes written to audio FIFO, for which 'timestamp' is valid. 112 * 'available' is the number of frames available to read (for input) or yet to be played 113 * (for output) frames in the PCM buffer. 114 * timestamp and available are updated by pcm_get_htimestamp(), so they use the same 115 * datatypes as the corresponding arguments to that function. */ 116 struct aec_info { 117 struct timespec timestamp; 118 uint64_t timestamp_usec; 119 unsigned int available; 120 size_t bytes; 121 }; 122 123 #endif /* #ifndef _YUKAWA_AUDIO_HW_H_ */ 124