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Diffstat (limited to 'include_all/hardware/audio_policy.h')
| -rw-r--r-- | include_all/hardware/audio_policy.h | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/include_all/hardware/audio_policy.h b/include_all/hardware/audio_policy.h new file mode 100644 index 00000000..bacb1e55 --- /dev/null +++ b/include_all/hardware/audio_policy.h @@ -0,0 +1,457 @@ +/* + * Copyright (C) 2011 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_AUDIO_POLICY_INTERFACE_H +#define ANDROID_AUDIO_POLICY_INTERFACE_H + +#include <stdint.h> +#include <sys/cdefs.h> +#include <sys/types.h> + +#include <hardware/hardware.h> + +#include <system/audio.h> +#include <system/audio_policy.h> + +__BEGIN_DECLS + +/** + * The id of this module + */ +#define AUDIO_POLICY_HARDWARE_MODULE_ID "audio_policy" + +/** + * Name of the audio devices to open + */ +#define AUDIO_POLICY_INTERFACE "policy" + +/* ---------------------------------------------------------------------------- */ + +/* + * The audio_policy and audio_policy_service_ops structs define the + * communication interfaces between the platform specific audio policy manager + * and Android generic audio policy manager. + * The platform specific audio policy manager must implement methods of the + * audio_policy struct. + * This implementation makes use of the audio_policy_service_ops to control + * the activity and configuration of audio input and output streams. + * + * The platform specific audio policy manager is in charge of the audio + * routing and volume control policies for a given platform. + * The main roles of this module are: + * - keep track of current system state (removable device connections, phone + * state, user requests...). + * System state changes and user actions are notified to audio policy + * manager with methods of the audio_policy. + * + * - process get_output() queries received when AudioTrack objects are + * created: Those queries return a handler on an output that has been + * selected, configured and opened by the audio policy manager and that + * must be used by the AudioTrack when registering to the AudioFlinger + * with the createTrack() method. + * When the AudioTrack object is released, a release_output() query + * is received and the audio policy manager can decide to close or + * reconfigure the output depending on other streams using this output and + * current system state. + * + * - similarly process get_input() and release_input() queries received from + * AudioRecord objects and configure audio inputs. + * - process volume control requests: the stream volume is converted from + * an index value (received from UI) to a float value applicable to each + * output as a function of platform specific settings and current output + * route (destination device). It also make sure that streams are not + * muted if not allowed (e.g. camera shutter sound in some countries). + */ + +/* XXX: this should be defined OUTSIDE of frameworks/base */ +struct effect_descriptor_s; + +struct audio_policy { + /* + * configuration functions + */ + + /* indicate a change in device connection status */ + int (*set_device_connection_state)(struct audio_policy *pol, + audio_devices_t device, + audio_policy_dev_state_t state, + const char *device_address); + + /* retrieve a device connection status */ + audio_policy_dev_state_t (*get_device_connection_state)( + const struct audio_policy *pol, + audio_devices_t device, + const char *device_address); + + /* indicate a change in phone state. Valid phones states are defined + * by audio_mode_t */ + void (*set_phone_state)(struct audio_policy *pol, audio_mode_t state); + + /* deprecated, never called (was "indicate a change in ringer mode") */ + void (*set_ringer_mode)(struct audio_policy *pol, uint32_t mode, + uint32_t mask); + + /* force using a specific device category for the specified usage */ + void (*set_force_use)(struct audio_policy *pol, + audio_policy_force_use_t usage, + audio_policy_forced_cfg_t config); + + /* retrieve current device category forced for a given usage */ + audio_policy_forced_cfg_t (*get_force_use)(const struct audio_policy *pol, + audio_policy_force_use_t usage); + + /* if can_mute is true, then audio streams that are marked ENFORCED_AUDIBLE + * can still be muted. */ + void (*set_can_mute_enforced_audible)(struct audio_policy *pol, + bool can_mute); + + /* check proper initialization */ + int (*init_check)(const struct audio_policy *pol); + + /* + * Audio routing query functions + */ + + /* request an output appropriate for playback of the supplied stream type and + * parameters */ + audio_io_handle_t (*get_output)(struct audio_policy *pol, + audio_stream_type_t stream, + uint32_t samplingRate, + audio_format_t format, + audio_channel_mask_t channelMask, + audio_output_flags_t flags, + const audio_offload_info_t *offloadInfo); + + /* indicates to the audio policy manager that the output starts being used + * by corresponding stream. */ + int (*start_output)(struct audio_policy *pol, + audio_io_handle_t output, + audio_stream_type_t stream, + audio_session_t session); + + /* indicates to the audio policy manager that the output stops being used + * by corresponding stream. */ + int (*stop_output)(struct audio_policy *pol, + audio_io_handle_t output, + audio_stream_type_t stream, + audio_session_t session); + + /* releases the output. */ + void (*release_output)(struct audio_policy *pol, audio_io_handle_t output); + + /* request an input appropriate for record from the supplied device with + * supplied parameters. */ + audio_io_handle_t (*get_input)(struct audio_policy *pol, audio_source_t inputSource, + uint32_t samplingRate, + audio_format_t format, + audio_channel_mask_t channelMask, + audio_in_acoustics_t acoustics); + + /* indicates to the audio policy manager that the input starts being used */ + int (*start_input)(struct audio_policy *pol, audio_io_handle_t input); + + /* indicates to the audio policy manager that the input stops being used. */ + int (*stop_input)(struct audio_policy *pol, audio_io_handle_t input); + + /* releases the input. */ + void (*release_input)(struct audio_policy *pol, audio_io_handle_t input); + + /* + * volume control functions + */ + + /* initialises stream volume conversion parameters by specifying volume + * index range. The index range for each stream is defined by AudioService. */ + void (*init_stream_volume)(struct audio_policy *pol, + audio_stream_type_t stream, + int index_min, + int index_max); + + /* sets the new stream volume at a level corresponding to the supplied + * index. The index is within the range specified by init_stream_volume() */ + int (*set_stream_volume_index)(struct audio_policy *pol, + audio_stream_type_t stream, + int index); + + /* retrieve current volume index for the specified stream */ + int (*get_stream_volume_index)(const struct audio_policy *pol, + audio_stream_type_t stream, + int *index); + + /* sets the new stream volume at a level corresponding to the supplied + * index for the specified device. + * The index is within the range specified by init_stream_volume() */ + int (*set_stream_volume_index_for_device)(struct audio_policy *pol, + audio_stream_type_t stream, + int index, + audio_devices_t device); + + /* retrieve current volume index for the specified stream for the specified device */ + int (*get_stream_volume_index_for_device)(const struct audio_policy *pol, + audio_stream_type_t stream, + int *index, + audio_devices_t device); + + /* return the strategy corresponding to a given stream type */ + uint32_t (*get_strategy_for_stream)(const struct audio_policy *pol, + audio_stream_type_t stream); + + /* return the enabled output devices for the given stream type */ + audio_devices_t (*get_devices_for_stream)(const struct audio_policy *pol, + audio_stream_type_t stream); + + /* Audio effect management */ + audio_io_handle_t (*get_output_for_effect)(struct audio_policy *pol, + const struct effect_descriptor_s *desc); + + int (*register_effect)(struct audio_policy *pol, + const struct effect_descriptor_s *desc, + audio_io_handle_t output, + uint32_t strategy, + audio_session_t session, + int id); + + int (*unregister_effect)(struct audio_policy *pol, int id); + + int (*set_effect_enabled)(struct audio_policy *pol, int id, bool enabled); + + bool (*is_stream_active)(const struct audio_policy *pol, + audio_stream_type_t stream, + uint32_t in_past_ms); + + bool (*is_stream_active_remotely)(const struct audio_policy *pol, + audio_stream_type_t stream, + uint32_t in_past_ms); + + bool (*is_source_active)(const struct audio_policy *pol, + audio_source_t source); + + /* dump state */ + int (*dump)(const struct audio_policy *pol, int fd); + + /* check if offload is possible for given sample rate, bitrate, duration, ... */ + bool (*is_offload_supported)(const struct audio_policy *pol, + const audio_offload_info_t *info); +}; + + +struct audio_policy_service_ops { + /* + * Audio output Control functions + */ + + /* Opens an audio output with the requested parameters. + * + * The parameter values can indicate to use the default values in case the + * audio policy manager has no specific requirements for the output being + * opened. + * + * When the function returns, the parameter values reflect the actual + * values used by the audio hardware output stream. + * + * The audio policy manager can check if the proposed parameters are + * suitable or not and act accordingly. + */ + audio_io_handle_t (*open_output)(void *service, + audio_devices_t *pDevices, + uint32_t *pSamplingRate, + audio_format_t *pFormat, + audio_channel_mask_t *pChannelMask, + uint32_t *pLatencyMs, + audio_output_flags_t flags); + + /* creates a special output that is duplicated to the two outputs passed as + * arguments. The duplication is performed by + * a special mixer thread in the AudioFlinger. + */ + audio_io_handle_t (*open_duplicate_output)(void *service, + audio_io_handle_t output1, + audio_io_handle_t output2); + + /* closes the output stream */ + int (*close_output)(void *service, audio_io_handle_t output); + + /* suspends the output. + * + * When an output is suspended, the corresponding audio hardware output + * stream is placed in standby and the AudioTracks attached to the mixer + * thread are still processed but the output mix is discarded. + */ + int (*suspend_output)(void *service, audio_io_handle_t output); + + /* restores a suspended output. */ + int (*restore_output)(void *service, audio_io_handle_t output); + + /* */ + /* Audio input Control functions */ + /* */ + + /* opens an audio input + * deprecated - new implementations should use open_input_on_module, + * and the acoustics parameter is ignored + */ + audio_io_handle_t (*open_input)(void *service, + audio_devices_t *pDevices, + uint32_t *pSamplingRate, + audio_format_t *pFormat, + audio_channel_mask_t *pChannelMask, + audio_in_acoustics_t acoustics); + + /* closes an audio input */ + int (*close_input)(void *service, audio_io_handle_t input); + + /* */ + /* misc control functions */ + /* */ + + /* set a stream volume for a particular output. + * + * For the same user setting, a given stream type can have different + * volumes for each output (destination device) it is attached to. + */ + int (*set_stream_volume)(void *service, + audio_stream_type_t stream, + float volume, + audio_io_handle_t output, + int delay_ms); + + /* invalidate a stream type, causing a reroute to an unspecified new output */ + int (*invalidate_stream)(void *service, + audio_stream_type_t stream); + + /* function enabling to send proprietary informations directly from audio + * policy manager to audio hardware interface. */ + void (*set_parameters)(void *service, + audio_io_handle_t io_handle, + const char *kv_pairs, + int delay_ms); + + /* function enabling to receive proprietary informations directly from + * audio hardware interface to audio policy manager. + * + * Returns a pointer to a heap allocated string. The caller is responsible + * for freeing the memory for it using free(). + */ + + char * (*get_parameters)(void *service, audio_io_handle_t io_handle, + const char *keys); + + /* request the playback of a tone on the specified stream. + * used for instance to replace notification sounds when playing over a + * telephony device during a phone call. + */ + int (*start_tone)(void *service, + audio_policy_tone_t tone, + audio_stream_type_t stream); + + int (*stop_tone)(void *service); + + /* set down link audio volume. */ + int (*set_voice_volume)(void *service, + float volume, + int delay_ms); + + /* move effect to the specified output */ + int (*move_effects)(void *service, + audio_session_t session, + audio_io_handle_t src_output, + audio_io_handle_t dst_output); + + /* loads an audio hw module. + * + * The module name passed is the base name of the HW module library, e.g "primary" or "a2dp". + * The function returns a handle on the module that will be used to specify a particular + * module when calling open_output_on_module() or open_input_on_module() + */ + audio_module_handle_t (*load_hw_module)(void *service, + const char *name); + + /* Opens an audio output on a particular HW module. + * + * Same as open_output() but specifying a specific HW module on which the output must be opened. + */ + audio_io_handle_t (*open_output_on_module)(void *service, + audio_module_handle_t module, + audio_devices_t *pDevices, + uint32_t *pSamplingRate, + audio_format_t *pFormat, + audio_channel_mask_t *pChannelMask, + uint32_t *pLatencyMs, + audio_output_flags_t flags, + const audio_offload_info_t *offloadInfo); + + /* Opens an audio input on a particular HW module. + * + * Same as open_input() but specifying a specific HW module on which the input must be opened. + * Also removed deprecated acoustics parameter + */ + audio_io_handle_t (*open_input_on_module)(void *service, + audio_module_handle_t module, + audio_devices_t *pDevices, + uint32_t *pSamplingRate, + audio_format_t *pFormat, + audio_channel_mask_t *pChannelMask); + +}; + +/**********************************************************************/ + +/** + * Every hardware module must have a data structure named HAL_MODULE_INFO_SYM + * and the fields of this data structure must begin with hw_module_t + * followed by module specific information. + */ +typedef struct audio_policy_module { + struct hw_module_t common; +} audio_policy_module_t; + +struct audio_policy_device { + /** + * Common methods of the audio policy device. This *must* be the first member of + * audio_policy_device as users of this structure will cast a hw_device_t to + * audio_policy_device pointer in contexts where it's known the hw_device_t references an + * audio_policy_device. + */ + struct hw_device_t common; + + int (*create_audio_policy)(const struct audio_policy_device *device, + struct audio_policy_service_ops *aps_ops, + void *service, + struct audio_policy **ap); + + int (*destroy_audio_policy)(const struct audio_policy_device *device, + struct audio_policy *ap); +}; + +/** convenience API for opening and closing a supported device */ + +static inline int audio_policy_dev_open(const hw_module_t* module, + struct audio_policy_device** device) +{ + return module->methods->open(module, AUDIO_POLICY_INTERFACE, + (hw_device_t**)device); +} + +static inline int audio_policy_dev_close(struct audio_policy_device* device) +{ + return device->common.close(&device->common); +} + + +__END_DECLS + +#endif // ANDROID_AUDIO_POLICY_INTERFACE_H |