| /* |
| * Copyright (C) 2015 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_RADIO_H |
| #define ANDROID_RADIO_H |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <sys/cdefs.h> |
| #include <sys/types.h> |
| |
| |
| #define RADIO_NUM_BANDS_MAX 16 |
| #define RADIO_NUM_SPACINGS_MAX 16 |
| #define RADIO_STRING_LEN_MAX 128 |
| |
| /* |
| * Radio hardware module class. A given radio hardware module HAL is of one class |
| * only. The platform can not have more than one hardware module of each class. |
| * Current version of the framework only supports RADIO_CLASS_AM_FM. |
| */ |
| typedef enum { |
| RADIO_CLASS_AM_FM = 0, /* FM (including HD radio) and AM */ |
| RADIO_CLASS_SAT = 1, /* Satellite Radio */ |
| RADIO_CLASS_DT = 2, /* Digital Radio (DAB) */ |
| } radio_class_t; |
| |
| /* value for field "type" of radio band described in struct radio_hal_band_config */ |
| typedef enum { |
| RADIO_BAND_AM = 0, /* Amplitude Modulation band: LW, MW, SW */ |
| RADIO_BAND_FM = 1, /* Frequency Modulation band: FM */ |
| RADIO_BAND_FM_HD = 2, /* FM HD Radio / DRM (IBOC) */ |
| RADIO_BAND_AM_HD = 3, /* AM HD Radio / DRM (IBOC) */ |
| } radio_band_t; |
| |
| /* RDS variant implemented. A struct radio_hal_fm_band_config can list none or several. */ |
| enum { |
| RADIO_RDS_NONE = 0x0, |
| RADIO_RDS_WORLD = 0x01, |
| RADIO_RDS_US = 0x02, |
| }; |
| typedef unsigned int radio_rds_t; |
| |
| /* FM deemphasis variant implemented. A struct radio_hal_fm_band_config can list one or more. */ |
| enum { |
| RADIO_DEEMPHASIS_50 = 0x1, |
| RADIO_DEEMPHASIS_75 = 0x2, |
| }; |
| typedef unsigned int radio_deemphasis_t; |
| |
| /* Region a particular radio band configuration corresponds to. Not used at the HAL. |
| * Derived by the framework when converting the band descriptors retrieved from the HAL to |
| * individual band descriptors for each supported region. */ |
| typedef enum { |
| RADIO_REGION_NONE = -1, |
| RADIO_REGION_ITU_1 = 0, |
| RADIO_REGION_ITU_2 = 1, |
| RADIO_REGION_OIRT = 2, |
| RADIO_REGION_JAPAN = 3, |
| RADIO_REGION_KOREA = 4, |
| } radio_region_t; |
| |
| /* scanning direction for scan() and step() tuner APIs */ |
| typedef enum { |
| RADIO_DIRECTION_UP, |
| RADIO_DIRECTION_DOWN |
| } radio_direction_t; |
| |
| /* unique handle allocated to a radio module */ |
| typedef unsigned int radio_handle_t; |
| |
| /* Opaque meta data structure used by radio meta data API (see system/radio_metadata.h) */ |
| typedef struct radio_medtadata radio_metadata_t; |
| |
| |
| /* Additional attributes for an FM band configuration */ |
| typedef struct radio_hal_fm_band_config { |
| radio_deemphasis_t deemphasis; /* deemphasis variant */ |
| bool stereo; /* stereo supported */ |
| radio_rds_t rds; /* RDS variants supported */ |
| bool ta; /* Traffic Announcement supported */ |
| bool af; /* Alternate Frequency supported */ |
| bool ea; /* Emergency announcements supported */ |
| } radio_hal_fm_band_config_t; |
| |
| /* Additional attributes for an AM band configuration */ |
| typedef struct radio_hal_am_band_config { |
| bool stereo; /* stereo supported */ |
| } radio_hal_am_band_config_t; |
| |
| /* Radio band configuration. Describes a given band supported by the radio module. |
| * The HAL can expose only one band per type with the the maximum range supported and all options. |
| * THe framework will derive the actual regions were this module can operate and expose separate |
| * band configurations for applications to chose from. */ |
| typedef struct radio_hal_band_config { |
| radio_band_t type; |
| bool antenna_connected; |
| unsigned int lower_limit; |
| unsigned int upper_limit; |
| unsigned int num_spacings; |
| unsigned int spacings[RADIO_NUM_SPACINGS_MAX]; |
| union { |
| radio_hal_fm_band_config_t fm; |
| radio_hal_am_band_config_t am; |
| }; |
| } radio_hal_band_config_t; |
| |
| /* Used internally by the framework to represent a band for s specific region */ |
| typedef struct radio_band_config { |
| radio_region_t region; |
| radio_hal_band_config_t band; |
| } radio_band_config_t; |
| |
| |
| /* Exposes properties of a given hardware radio module. |
| * NOTE: current framework implementation supports only one audio source (num_audio_sources = 1). |
| * The source corresponds to AUDIO_DEVICE_IN_FM_TUNER. |
| * If more than one tuner is supported (num_tuners > 1), only one can be connected to the audio |
| * source. */ |
| typedef struct radio_hal_properties { |
| radio_class_t class_id; /* Class of this module. E.g RADIO_CLASS_AM_FM */ |
| char implementor[RADIO_STRING_LEN_MAX]; /* implementor name */ |
| char product[RADIO_STRING_LEN_MAX]; /* product name */ |
| char version[RADIO_STRING_LEN_MAX]; /* product version */ |
| char serial[RADIO_STRING_LEN_MAX]; /* serial number (for subscription services) */ |
| unsigned int num_tuners; /* number of tuners controllable independently */ |
| unsigned int num_audio_sources; /* number of audio sources driven simultaneously */ |
| bool supports_capture; /* the hardware supports capture of audio source audio HAL */ |
| unsigned int num_bands; /* number of band descriptors */ |
| radio_hal_band_config_t bands[RADIO_NUM_BANDS_MAX]; /* band descriptors */ |
| } radio_hal_properties_t; |
| |
| /* Used internally by the framework. Same information as in struct radio_hal_properties plus a |
| * unique handle and one band configuration per region. */ |
| typedef struct radio_properties { |
| radio_handle_t handle; |
| radio_class_t class_id; |
| char implementor[RADIO_STRING_LEN_MAX]; |
| char product[RADIO_STRING_LEN_MAX]; |
| char version[RADIO_STRING_LEN_MAX]; |
| char serial[RADIO_STRING_LEN_MAX]; |
| unsigned int num_tuners; |
| unsigned int num_audio_sources; |
| bool supports_capture; |
| unsigned int num_bands; |
| radio_band_config_t bands[RADIO_NUM_BANDS_MAX]; |
| } radio_properties_t; |
| |
| /* Radio program information. Returned by the HAL with event RADIO_EVENT_TUNED. |
| * Contains information on currently tuned channel. |
| */ |
| typedef struct radio_program_info { |
| unsigned int channel; /* current channel. (e.g kHz for band type RADIO_BAND_FM) */ |
| unsigned int sub_channel; /* current sub channel. (used for RADIO_BAND_FM_HD) */ |
| bool tuned; /* tuned to a program or not */ |
| bool stereo; /* program is stereo or not */ |
| bool digital; /* digital program or not (e.g HD Radio program) */ |
| unsigned int signal_strength; /* signal strength from 0 to 100 */ |
| radio_metadata_t *metadata; /* non null if meta data are present (e.g PTY, song title ...) */ |
| } radio_program_info_t; |
| |
| |
| /* Events sent to the framework via the HAL callback. An event can notify the completion of an |
| * asynchronous command (configuration, tune, scan ...) or a spontaneous change (antenna connection, |
| * failure, AF switching, meta data reception... */ |
| enum { |
| RADIO_EVENT_HW_FAILURE = 0, /* hardware module failure. Requires reopening the tuner */ |
| RADIO_EVENT_CONFIG = 1, /* configuration change completed */ |
| RADIO_EVENT_ANTENNA = 2, /* Antenna connected, disconnected */ |
| RADIO_EVENT_TUNED = 3, /* tune, step, scan completed */ |
| RADIO_EVENT_METADATA = 4, /* New meta data received */ |
| RADIO_EVENT_TA = 5, /* Traffic announcement start or stop */ |
| RADIO_EVENT_AF_SWITCH = 6, /* Switch to Alternate Frequency */ |
| RADIO_EVENT_EA = 7, /* Emergency announcement start or stop */ |
| // begin framework only events |
| RADIO_EVENT_CONTROL = 100, /* loss/gain of tuner control */ |
| RADIO_EVENT_SERVER_DIED = 101, /* radio service died */ |
| }; |
| typedef unsigned int radio_event_type_t; |
| |
| /* Event passed to the framework by the HAL callback */ |
| typedef struct radio_hal_event { |
| radio_event_type_t type; /* event type */ |
| int status; /* used by RADIO_EVENT_CONFIG, RADIO_EVENT_TUNED */ |
| union { |
| /* RADIO_EVENT_ANTENNA, RADIO_EVENT_TA, RADIO_EVENT_EA */ |
| bool on; |
| radio_hal_band_config_t config; /* RADIO_EVENT_CONFIG */ |
| radio_program_info_t info; /* RADIO_EVENT_TUNED, RADIO_EVENT_AF_SWITCH */ |
| radio_metadata_t *metadata; /* RADIO_EVENT_METADATA */ |
| }; |
| } radio_hal_event_t; |
| |
| /* Used internally by the framework. Same information as in struct radio_hal_event */ |
| typedef struct radio_event { |
| radio_event_type_t type; |
| int status; |
| union { |
| bool on; |
| radio_band_config_t config; |
| radio_program_info_t info; |
| radio_metadata_t *metadata; /* offset from start of struct when in shared memory */ |
| }; |
| } radio_event_t; |
| |
| |
| static radio_rds_t radio_rds_for_region(bool rds, radio_region_t region) { |
| if (!rds) |
| return RADIO_RDS_NONE; |
| switch(region) { |
| case RADIO_REGION_ITU_1: |
| case RADIO_REGION_OIRT: |
| case RADIO_REGION_JAPAN: |
| case RADIO_REGION_KOREA: |
| return RADIO_RDS_WORLD; |
| case RADIO_REGION_ITU_2: |
| return RADIO_RDS_US; |
| default: |
| return RADIO_REGION_NONE; |
| } |
| } |
| |
| static radio_deemphasis_t radio_demephasis_for_region(radio_region_t region) { |
| switch(region) { |
| case RADIO_REGION_KOREA: |
| case RADIO_REGION_ITU_2: |
| return RADIO_DEEMPHASIS_75; |
| case RADIO_REGION_ITU_1: |
| case RADIO_REGION_OIRT: |
| case RADIO_REGION_JAPAN: |
| default: |
| return RADIO_DEEMPHASIS_50; |
| } |
| } |
| |
| #endif // ANDROID_RADIO_H |
