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* Copyright (C) 2015 The Android Open Source Project
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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#ifndef ANDROID_RADIO_H
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#define ANDROID_RADIO_H
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#define RADIO_NUM_BANDS_MAX 16
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#define RADIO_NUM_SPACINGS_MAX 16
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#define RADIO_STRING_LEN_MAX 128
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* Radio hardware module class. A given radio hardware module HAL is of one class
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* only. The platform can not have more than one hardware module of each class.
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* Current version of the framework only supports RADIO_CLASS_AM_FM.
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RADIO_CLASS_AM_FM = 0, /* FM (including HD radio) and AM */
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RADIO_CLASS_SAT = 1, /* Satellite Radio */
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RADIO_CLASS_DT = 2, /* Digital Radio (DAB) */
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/* value for field "type" of radio band described in struct radio_hal_band_config */
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RADIO_BAND_AM = 0, /* Amplitude Modulation band: LW, MW, SW */
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RADIO_BAND_FM = 1, /* Frequency Modulation band: FM */
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RADIO_BAND_FM_HD = 2, /* FM HD Radio / DRM (IBOC) */
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RADIO_BAND_AM_HD = 3, /* AM HD Radio / DRM (IBOC) */
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/* RDS variant implemented. A struct radio_hal_fm_band_config can list none or several. */
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RADIO_RDS_WORLD = 0x01,
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typedef unsigned int radio_rds_t;
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/* FM deemphasis variant implemented. A struct radio_hal_fm_band_config can list one or more. */
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RADIO_DEEMPHASIS_50 = 0x1,
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RADIO_DEEMPHASIS_75 = 0x2,
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typedef unsigned int radio_deemphasis_t;
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/* Region a particular radio band configuration corresponds to. Not used at the HAL.
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* Derived by the framework when converting the band descriptors retrieved from the HAL to
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* individual band descriptors for each supported region. */
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RADIO_REGION_NONE = -1,
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RADIO_REGION_ITU_1 = 0,
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RADIO_REGION_ITU_2 = 1,
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RADIO_REGION_OIRT = 2,
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RADIO_REGION_JAPAN = 3,
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RADIO_REGION_KOREA = 4,
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/* scanning direction for scan() and step() tuner APIs */
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/* unique handle allocated to a radio module */
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typedef uint32_t radio_handle_t;
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/* Opaque meta data structure used by radio meta data API (see system/radio_metadata.h) */
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typedef struct radio_metadata radio_metadata_t;
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/* Additional attributes for an FM band configuration */
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typedef struct radio_hal_fm_band_config {
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radio_deemphasis_t deemphasis; /* deemphasis variant */
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bool stereo; /* stereo supported */
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radio_rds_t rds; /* RDS variants supported */
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bool ta; /* Traffic Announcement supported */
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bool af; /* Alternate Frequency supported */
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bool ea; /* Emergency announcements supported */
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} radio_hal_fm_band_config_t;
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/* Additional attributes for an AM band configuration */
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typedef struct radio_hal_am_band_config {
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bool stereo; /* stereo supported */
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} radio_hal_am_band_config_t;
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/* Radio band configuration. Describes a given band supported by the radio module.
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* The HAL can expose only one band per type with the the maximum range supported and all options.
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* THe framework will derive the actual regions were this module can operate and expose separate
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* band configurations for applications to chose from. */
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typedef struct radio_hal_band_config {
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bool antenna_connected;
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uint32_t lower_limit;
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uint32_t upper_limit;
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uint32_t num_spacings;
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uint32_t spacings[RADIO_NUM_SPACINGS_MAX];
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radio_hal_fm_band_config_t fm;
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radio_hal_am_band_config_t am;
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} radio_hal_band_config_t;
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/* Used internally by the framework to represent a band for s specific region */
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typedef struct radio_band_config {
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radio_region_t region;
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radio_hal_band_config_t band;
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} radio_band_config_t;
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/* Exposes properties of a given hardware radio module.
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* NOTE: current framework implementation supports only one audio source (num_audio_sources = 1).
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* The source corresponds to AUDIO_DEVICE_IN_FM_TUNER.
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* If more than one tuner is supported (num_tuners > 1), only one can be connected to the audio
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typedef struct radio_hal_properties {
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radio_class_t class_id; /* Class of this module. E.g RADIO_CLASS_AM_FM */
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char implementor[RADIO_STRING_LEN_MAX]; /* implementor name */
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char product[RADIO_STRING_LEN_MAX]; /* product name */
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char version[RADIO_STRING_LEN_MAX]; /* product version */
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char serial[RADIO_STRING_LEN_MAX]; /* serial number (for subscription services) */
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uint32_t num_tuners; /* number of tuners controllable independently */
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uint32_t num_audio_sources; /* number of audio sources driven simultaneously */
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bool supports_capture; /* the hardware supports capture of audio source audio HAL */
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uint32_t num_bands; /* number of band descriptors */
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radio_hal_band_config_t bands[RADIO_NUM_BANDS_MAX]; /* band descriptors */
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} radio_hal_properties_t;
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/* Used internally by the framework. Same information as in struct radio_hal_properties plus a
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* unique handle and one band configuration per region. */
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typedef struct radio_properties {
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radio_handle_t handle;
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radio_class_t class_id;
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char implementor[RADIO_STRING_LEN_MAX];
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char product[RADIO_STRING_LEN_MAX];
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char version[RADIO_STRING_LEN_MAX];
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char serial[RADIO_STRING_LEN_MAX];
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uint32_t num_audio_sources;
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bool supports_capture;
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radio_band_config_t bands[RADIO_NUM_BANDS_MAX];
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} radio_properties_t;
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/* Radio program information. Returned by the HAL with event RADIO_EVENT_TUNED.
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* Contains information on currently tuned channel.
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typedef struct radio_program_info {
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uint32_t channel; /* current channel. (e.g kHz for band type RADIO_BAND_FM) */
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uint32_t sub_channel; /* current sub channel. (used for RADIO_BAND_FM_HD) */
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bool tuned; /* tuned to a program or not */
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bool stereo; /* program is stereo or not */
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bool digital; /* digital program or not (e.g HD Radio program) */
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uint32_t signal_strength; /* signal strength from 0 to 100 */
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/* meta data (e.g PTY, song title ...), must not be NULL */
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__attribute__((aligned(8))) radio_metadata_t *metadata;
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} radio_program_info_t;
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/* Events sent to the framework via the HAL callback. An event can notify the completion of an
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* asynchronous command (configuration, tune, scan ...) or a spontaneous change (antenna connection,
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* failure, AF switching, meta data reception... */
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RADIO_EVENT_HW_FAILURE = 0, /* hardware module failure. Requires reopening the tuner */
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RADIO_EVENT_CONFIG = 1, /* configuration change completed */
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RADIO_EVENT_ANTENNA = 2, /* Antenna connected, disconnected */
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RADIO_EVENT_TUNED = 3, /* tune, step, scan completed */
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RADIO_EVENT_METADATA = 4, /* New meta data received */
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RADIO_EVENT_TA = 5, /* Traffic announcement start or stop */
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RADIO_EVENT_AF_SWITCH = 6, /* Switch to Alternate Frequency */
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RADIO_EVENT_EA = 7, /* Emergency announcement start or stop */
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// begin framework only events
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RADIO_EVENT_CONTROL = 100, /* loss/gain of tuner control */
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RADIO_EVENT_SERVER_DIED = 101, /* radio service died */
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typedef unsigned int radio_event_type_t;
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/* Event passed to the framework by the HAL callback */
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typedef struct radio_hal_event {
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radio_event_type_t type; /* event type */
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int32_t status; /* used by RADIO_EVENT_CONFIG, RADIO_EVENT_TUNED */
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/* RADIO_EVENT_ANTENNA, RADIO_EVENT_TA, RADIO_EVENT_EA */
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radio_hal_band_config_t config; /* RADIO_EVENT_CONFIG */
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radio_program_info_t info; /* RADIO_EVENT_TUNED, RADIO_EVENT_AF_SWITCH */
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radio_metadata_t *metadata; /* RADIO_EVENT_METADATA */
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/* Used internally by the framework. Same information as in struct radio_hal_event */
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typedef struct radio_event {
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radio_event_type_t type;
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radio_band_config_t config;
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radio_program_info_t info;
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/* meta data (e.g PTY, song title ...), must not be NULL */
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__attribute__((aligned(8))) radio_metadata_t *metadata;
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radio_rds_t radio_rds_for_region(bool rds, radio_region_t region) {
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return RADIO_RDS_NONE;
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case RADIO_REGION_ITU_1:
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case RADIO_REGION_OIRT:
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case RADIO_REGION_JAPAN:
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case RADIO_REGION_KOREA:
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return RADIO_RDS_WORLD;
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case RADIO_REGION_ITU_2:
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return RADIO_REGION_NONE;
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radio_deemphasis_t radio_demephasis_for_region(radio_region_t region) {
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case RADIO_REGION_KOREA:
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case RADIO_REGION_ITU_2:
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return RADIO_DEEMPHASIS_75;
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case RADIO_REGION_ITU_1:
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case RADIO_REGION_OIRT:
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case RADIO_REGION_JAPAN:
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return RADIO_DEEMPHASIS_50;
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#endif // ANDROID_RADIO_H