1 /* 2 * Copyright (C) 2015 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 ANDROID_RADIO_H 18 #define ANDROID_RADIO_H 19 20 #include <stdbool.h> 21 #include <stdint.h> 22 #include <stdio.h> 23 #include <sys/cdefs.h> 24 #include <sys/types.h> 25 26 27 #define RADIO_NUM_BANDS_MAX 16 28 #define RADIO_NUM_SPACINGS_MAX 16 29 #define RADIO_STRING_LEN_MAX 128 30 31 /* 32 * Radio hardware module class. A given radio hardware module HAL is of one class 33 * only. The platform can not have more than one hardware module of each class. 34 * Current version of the framework only supports RADIO_CLASS_AM_FM. 35 */ 36 typedef enum { 37 RADIO_CLASS_AM_FM = 0, /* FM (including HD radio) and AM */ 38 RADIO_CLASS_SAT = 1, /* Satellite Radio */ 39 RADIO_CLASS_DT = 2, /* Digital Radio (DAB) */ 40 } radio_class_t; 41 42 /* value for field "type" of radio band described in struct radio_hal_band_config */ 43 typedef enum { 44 RADIO_BAND_AM = 0, /* Amplitude Modulation band: LW, MW, SW */ 45 RADIO_BAND_FM = 1, /* Frequency Modulation band: FM */ 46 RADIO_BAND_FM_HD = 2, /* FM HD Radio / DRM (IBOC) */ 47 RADIO_BAND_AM_HD = 3, /* AM HD Radio / DRM (IBOC) */ 48 } radio_band_t; 49 50 /* RDS variant implemented. A struct radio_hal_fm_band_config can list none or several. */ 51 enum { 52 RADIO_RDS_NONE = 0x0, 53 RADIO_RDS_WORLD = 0x01, 54 RADIO_RDS_US = 0x02, 55 }; 56 typedef unsigned int radio_rds_t; 57 58 /* FM deemphasis variant implemented. A struct radio_hal_fm_band_config can list one or more. */ 59 enum { 60 RADIO_DEEMPHASIS_50 = 0x1, 61 RADIO_DEEMPHASIS_75 = 0x2, 62 }; 63 typedef unsigned int radio_deemphasis_t; 64 65 /* Region a particular radio band configuration corresponds to. Not used at the HAL. 66 * Derived by the framework when converting the band descriptors retrieved from the HAL to 67 * individual band descriptors for each supported region. */ 68 typedef enum { 69 RADIO_REGION_NONE = -1, 70 RADIO_REGION_ITU_1 = 0, 71 RADIO_REGION_ITU_2 = 1, 72 RADIO_REGION_OIRT = 2, 73 RADIO_REGION_JAPAN = 3, 74 RADIO_REGION_KOREA = 4, 75 } radio_region_t; 76 77 /* scanning direction for scan() and step() tuner APIs */ 78 typedef enum { 79 RADIO_DIRECTION_UP, 80 RADIO_DIRECTION_DOWN 81 } radio_direction_t; 82 83 /* unique handle allocated to a radio module */ 84 typedef unsigned int radio_handle_t; 85 86 /* Opaque meta data structure used by radio meta data API (see system/radio_metadata.h) */ 87 typedef struct radio_medtadata radio_metadata_t; 88 89 90 /* Additional attributes for an FM band configuration */ 91 typedef struct radio_hal_fm_band_config { 92 radio_deemphasis_t deemphasis; /* deemphasis variant */ 93 bool stereo; /* stereo supported */ 94 radio_rds_t rds; /* RDS variants supported */ 95 bool ta; /* Traffic Announcement supported */ 96 bool af; /* Alternate Frequency supported */ 97 } radio_hal_fm_band_config_t; 98 99 /* Additional attributes for an AM band configuration */ 100 typedef struct radio_hal_am_band_config { 101 bool stereo; /* stereo supported */ 102 } radio_hal_am_band_config_t; 103 104 /* Radio band configuration. Describes a given band supported by the radio module. 105 * The HAL can expose only one band per type with the the maximum range supported and all options. 106 * THe framework will derive the actual regions were this module can operate and expose separate 107 * band configurations for applications to chose from. */ 108 typedef struct radio_hal_band_config { 109 radio_band_t type; 110 bool antenna_connected; 111 unsigned int lower_limit; 112 unsigned int upper_limit; 113 unsigned int num_spacings; 114 unsigned int spacings[RADIO_NUM_SPACINGS_MAX]; 115 union { 116 radio_hal_fm_band_config_t fm; 117 radio_hal_am_band_config_t am; 118 }; 119 } radio_hal_band_config_t; 120 121 /* Used internally by the framework to represent a band for s specific region */ 122 typedef struct radio_band_config { 123 radio_region_t region; 124 radio_hal_band_config_t band; 125 } radio_band_config_t; 126 127 128 /* Exposes properties of a given hardware radio module. 129 * NOTE: current framework implementation supports only one audio source (num_audio_sources = 1). 130 * The source corresponds to AUDIO_DEVICE_IN_FM_TUNER. 131 * If more than one tuner is supported (num_tuners > 1), only one can be connected to the audio 132 * source. */ 133 typedef struct radio_hal_properties { 134 radio_class_t class_id; /* Class of this module. E.g RADIO_CLASS_AM_FM */ 135 char implementor[RADIO_STRING_LEN_MAX]; /* implementor name */ 136 char product[RADIO_STRING_LEN_MAX]; /* product name */ 137 char version[RADIO_STRING_LEN_MAX]; /* product version */ 138 char serial[RADIO_STRING_LEN_MAX]; /* serial number (for subscription services) */ 139 unsigned int num_tuners; /* number of tuners controllable independently */ 140 unsigned int num_audio_sources; /* number of audio sources driven simultaneously */ 141 bool supports_capture; /* the hardware supports capture of audio source audio HAL */ 142 unsigned int num_bands; /* number of band descriptors */ 143 radio_hal_band_config_t bands[RADIO_NUM_BANDS_MAX]; /* band descriptors */ 144 } radio_hal_properties_t; 145 146 /* Used internally by the framework. Same information as in struct radio_hal_properties plus a 147 * unique handle and one band configuration per region. */ 148 typedef struct radio_properties { 149 radio_handle_t handle; 150 radio_class_t class_id; 151 char implementor[RADIO_STRING_LEN_MAX]; 152 char product[RADIO_STRING_LEN_MAX]; 153 char version[RADIO_STRING_LEN_MAX]; 154 char serial[RADIO_STRING_LEN_MAX]; 155 unsigned int num_tuners; 156 unsigned int num_audio_sources; 157 bool supports_capture; 158 unsigned int num_bands; 159 radio_band_config_t bands[RADIO_NUM_BANDS_MAX]; 160 } radio_properties_t; 161 162 /* Radio program information. Returned by the HAL with event RADIO_EVENT_TUNED. 163 * Contains information on currently tuned channel. 164 */ 165 typedef struct radio_program_info { 166 unsigned int channel; /* current channel. (e.g kHz for band type RADIO_BAND_FM) */ 167 unsigned int sub_channel; /* current sub channel. (used for RADIO_BAND_FM_HD) */ 168 bool tuned; /* tuned to a program or not */ 169 bool stereo; /* program is stereo or not */ 170 bool digital; /* digital program or not (e.g HD Radio program) */ 171 unsigned int signal_strength; /* signal strength from 0 to 100 */ 172 radio_metadata_t *metadata; /* non null if meta data are present (e.g PTY, song title ...) */ 173 } radio_program_info_t; 174 175 176 /* Events sent to the framework via the HAL callback. An event can notify the completion of an 177 * asynchronous command (configuration, tune, scan ...) or a spontaneous change (antenna connection, 178 * failure, AF switching, meta data reception... */ 179 enum { 180 RADIO_EVENT_HW_FAILURE = 0, /* hardware module failure. Requires reopening the tuner */ 181 RADIO_EVENT_CONFIG = 1, /* configuration change completed */ 182 RADIO_EVENT_ANTENNA = 2, /* Antenna connected, disconnected */ 183 RADIO_EVENT_TUNED = 3, /* tune, step, scan completed */ 184 RADIO_EVENT_METADATA = 4, /* New meta data received */ 185 RADIO_EVENT_TA = 5, /* Traffic announcement start or stop */ 186 RADIO_EVENT_AF_SWITCH = 6, /* Switch to Alternate Frequency */ 187 // begin framework only events 188 RADIO_EVENT_CONTROL = 100, /* loss/gain of tuner control */ 189 RADIO_EVENT_SERVER_DIED = 101, /* radio service died */ 190 }; 191 typedef unsigned int radio_event_type_t; 192 193 /* Event passed to the framework by the HAL callback */ 194 typedef struct radio_hal_event { 195 radio_event_type_t type; /* event type */ 196 int status; /* used by RADIO_EVENT_CONFIG, RADIO_EVENT_TUNED */ 197 union { 198 bool on; /* RADIO_EVENT_ANTENNA, RADIO_EVENT_TA */ 199 radio_hal_band_config_t config; /* RADIO_EVENT_CONFIG */ 200 radio_program_info_t info; /* RADIO_EVENT_TUNED, RADIO_EVENT_AF_SWITCH */ 201 radio_metadata_t *metadata; /* RADIO_EVENT_METADATA */ 202 }; 203 } radio_hal_event_t; 204 205 /* Used internally by the framework. Same information as in struct radio_hal_event */ 206 typedef struct radio_event { 207 radio_event_type_t type; 208 int status; 209 union { 210 bool on; 211 radio_band_config_t config; 212 radio_program_info_t info; 213 radio_metadata_t *metadata; /* offset from start of struct when in shared memory */ 214 }; 215 } radio_event_t; 216 217 218 static radio_rds_t radio_rds_for_region(bool rds, radio_region_t region) { 219 if (!rds) 220 return RADIO_RDS_NONE; 221 switch(region) { 222 case RADIO_REGION_ITU_1: 223 case RADIO_REGION_OIRT: 224 case RADIO_REGION_JAPAN: 225 case RADIO_REGION_KOREA: 226 return RADIO_RDS_WORLD; 227 case RADIO_REGION_ITU_2: 228 return RADIO_RDS_US; 229 default: 230 return RADIO_REGION_NONE; 231 } 232 } 233 234 static radio_deemphasis_t radio_demephasis_for_region(radio_region_t region) { 235 switch(region) { 236 case RADIO_REGION_KOREA: 237 case RADIO_REGION_ITU_2: 238 return RADIO_DEEMPHASIS_75; 239 case RADIO_REGION_ITU_1: 240 case RADIO_REGION_OIRT: 241 case RADIO_REGION_JAPAN: 242 default: 243 return RADIO_DEEMPHASIS_50; 244 } 245 } 246 247 #endif // ANDROID_RADIO_H 248
