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/*
* Copyright 2014 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_TV_INPUT_INTERFACE_H
#define ANDROID_TV_INPUT_INTERFACE_H
#include <stdint.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <hardware/hardware.h>
#include <system/audio.h>
#include <cutils/native_handle.h>
__BEGIN_DECLS
/*
* Module versioning information for the TV input hardware module, based on
* tv_input_module_t.common.module_api_version.
*
* Version History:
*
* TV_INPUT_MODULE_API_VERSION_0_1:
* Initial TV input hardware module API.
*
*/
#define TV_INPUT_MODULE_API_VERSION_0_1 HARDWARE_MODULE_API_VERSION(0, 1)
#define TV_INPUT_DEVICE_API_VERSION_0_1 HARDWARE_DEVICE_API_VERSION(0, 1)
/*
* The id of this module
*/
#define TV_INPUT_HARDWARE_MODULE_ID "tv_input"
#define TV_INPUT_DEFAULT_DEVICE "default"
/*****************************************************************************/
/*
* 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 tv_input_module {
struct hw_module_t common;
} tv_input_module_t;
/*****************************************************************************/
enum {
/* Generic hardware. */
TV_INPUT_TYPE_OTHER_HARDWARE = 1,
/* Tuner. (e.g. built-in terrestrial tuner) */
TV_INPUT_TYPE_TUNER = 2,
TV_INPUT_TYPE_COMPOSITE = 3,
TV_INPUT_TYPE_SVIDEO = 4,
TV_INPUT_TYPE_SCART = 5,
TV_INPUT_TYPE_COMPONENT = 6,
TV_INPUT_TYPE_VGA = 7,
TV_INPUT_TYPE_DVI = 8,
/* Physical HDMI port. (e.g. HDMI 1) */
TV_INPUT_TYPE_HDMI = 9,
TV_INPUT_TYPE_DISPLAY_PORT = 10,
};
typedef uint32_t tv_input_type_t;
typedef struct tv_input_device_info {
/* Device ID */
int device_id;
/* Type of physical TV input. */
tv_input_type_t type;
union {
struct {
/* HDMI port ID number */
uint32_t port_id;
} hdmi;
/* TODO: add other type specific information. */
int32_t type_info_reserved[16];
};
/* TODO: Add capability if necessary. */
/*
* Audio info
*
* audio_type == AUDIO_DEVICE_NONE if this input has no audio.
*/
audio_devices_t audio_type;
const char* audio_address;
int32_t reserved[16];
} tv_input_device_info_t;
/* See tv_input_event_t for more details. */
enum {
/*
* Hardware notifies the framework that a device is available.
*
* Note that DEVICE_AVAILABLE and DEVICE_UNAVAILABLE events do not represent
* hotplug events (i.e. plugging cable into or out of the physical port).
* These events notify the framework whether the port is available or not.
* For a concrete example, when a user plugs in or pulls out the HDMI cable
* from a HDMI port, it does not generate DEVICE_AVAILABLE and/or
* DEVICE_UNAVAILABLE events. However, if a user inserts a pluggable USB
* tuner into the Android device, it will generate a DEVICE_AVAILABLE event
* and when the port is removed, it should generate a DEVICE_UNAVAILABLE
* event.
*
* For hotplug events, please see STREAM_CONFIGURATION_CHANGED for more
* details.
*
* HAL implementation should register devices by using this event when the
* device boots up. The framework will recognize device reported via this
* event only. In addition, the implementation could use this event to
* notify the framework that a removable TV input device (such as USB tuner
* as stated in the example above) is attached.
*/
TV_INPUT_EVENT_DEVICE_AVAILABLE = 1,
/*
* Hardware notifies the framework that a device is unavailable.
*
* HAL implementation should generate this event when a device registered
* by TV_INPUT_EVENT_DEVICE_AVAILABLE is no longer available. For example,
* the event can indicate that a USB tuner is plugged out from the Android
* device.
*
* Note that this event is not for indicating cable plugged out of the port;
* for that purpose, the implementation should use
* STREAM_CONFIGURATION_CHANGED event. This event represents the port itself
* being no longer available.
*/
TV_INPUT_EVENT_DEVICE_UNAVAILABLE = 2,
/*
* Stream configurations are changed. Client should regard all open streams
* at the specific device are closed, and should call
* get_stream_configurations() again, opening some of them if necessary.
*
* HAL implementation should generate this event when the available stream
* configurations change for any reason. A typical use case of this event
* would be to notify the framework that the input signal has changed
* resolution, or that the cable is plugged out so that the number of
* available streams is 0.
*
* The implementation may use this event to indicate hotplug status of the
* port. the framework regards input devices with no available streams as
* disconnected, so the implementation can generate this event with no
* available streams to indicate that this device is disconnected, and vice
* versa.
*/
TV_INPUT_EVENT_STREAM_CONFIGURATIONS_CHANGED = 3,
/*
* Hardware is done with capture request with the buffer. Client can assume
* ownership of the buffer again.
*
* HAL implementation should generate this event after request_capture() if
* it succeeded. The event shall have the buffer with the captured image.
*/
TV_INPUT_EVENT_CAPTURE_SUCCEEDED = 4,
/*
* Hardware met a failure while processing a capture request or client
* canceled the request. Client can assume ownership of the buffer again.
*
* The event is similar to TV_INPUT_EVENT_CAPTURE_SUCCEEDED, but HAL
* implementation generates this event upon a failure to process
* request_capture(), or a request cancellation.
*/
TV_INPUT_EVENT_CAPTURE_FAILED = 5,
};
typedef uint32_t tv_input_event_type_t;
typedef struct tv_input_capture_result {
/* Device ID */
int device_id;
/* Stream ID */
int stream_id;
/* Sequence number of the request */
uint32_t seq;
/*
* The buffer passed to hardware in request_capture(). The content of
* buffer is undefined (although buffer itself is valid) for
* TV_INPUT_CAPTURE_FAILED event.
*/
buffer_handle_t buffer;
/*
* Error code for the request. -ECANCELED if request is cancelled; other
* error codes are unknown errors.
*/
int error_code;
} tv_input_capture_result_t;
typedef struct tv_input_event {
tv_input_event_type_t type;
union {
/*
* TV_INPUT_EVENT_DEVICE_AVAILABLE: all fields are relevant
* TV_INPUT_EVENT_DEVICE_UNAVAILABLE: only device_id is relevant
* TV_INPUT_EVENT_STREAM_CONFIGURATIONS_CHANGED: only device_id is
* relevant
*/
tv_input_device_info_t device_info;
/*
* TV_INPUT_EVENT_CAPTURE_SUCCEEDED: error_code is not relevant
* TV_INPUT_EVENT_CAPTURE_FAILED: all fields are relevant
*/
tv_input_capture_result_t capture_result;
};
} tv_input_event_t;
typedef struct tv_input_callback_ops {
/*
* event contains the type of the event and additional data if necessary.
* The event object is guaranteed to be valid only for the duration of the
* call.
*
* data is an object supplied at device initialization, opaque to the
* hardware.
    */
void (*notify)(struct tv_input_device* dev,
tv_input_event_t* event, void* data);
} tv_input_callback_ops_t;
enum {
TV_STREAM_TYPE_INDEPENDENT_VIDEO_SOURCE = 1,
TV_STREAM_TYPE_BUFFER_PRODUCER = 2,
};
typedef uint32_t tv_stream_type_t;
typedef struct tv_stream_config {
/*
* ID number of the stream. This value is used to identify the whole stream
* configuration.
*/
int stream_id;
/* Type of the stream */
tv_stream_type_t type;
/* Max width/height of the stream. */
uint32_t max_video_width;
uint32_t max_video_height;
} tv_stream_config_t;
typedef struct buffer_producer_stream {
/*
* IN/OUT: Width / height of the stream. Client may request for specific
* size but hardware may change it. Client must allocate buffers with
* specified width and height.
*/
uint32_t width;
uint32_t height;
/* OUT: Client must set this usage when allocating buffer. */
uint32_t usage;
/* OUT: Client must allocate a buffer with this format. */
uint32_t format;
} buffer_producer_stream_t;
typedef struct tv_stream {
/* IN: ID in the stream configuration */
int stream_id;
/* OUT: Type of the stream (for convenience) */
tv_stream_type_t type;
/* Data associated with the stream for client's use */
union {
/* OUT: A native handle describing the sideband stream source */
native_handle_t* sideband_stream_source_handle;
/* IN/OUT: Details are in buffer_producer_stream_t */
buffer_producer_stream_t buffer_producer;
};
} tv_stream_t;
/*
* Every device data structure must begin with hw_device_t
* followed by module specific public methods and attributes.
*/
typedef struct tv_input_device {
struct hw_device_t common;
/*
* initialize:
*
* Provide callbacks to the device and start operation. At first, no device
* is available and after initialize() completes, currently available
* devices including static devices should notify via callback.
*
* Framework owns callbacks object.
*
* data is a framework-owned object which would be sent back to the
* framework for each callback notifications.
*
* Return 0 on success.
*/
int (*initialize)(struct tv_input_device* dev,
const tv_input_callback_ops_t* callback, void* data);
/*
* get_stream_configurations:
*
* Get stream configurations for a specific device. An input device may have
* multiple configurations.
*
* The configs object is guaranteed to be valid only until the next call to
* get_stream_configurations() or STREAM_CONFIGURATIONS_CHANGED event.
*
* Return 0 on success.
*/
int (*get_stream_configurations)(const struct tv_input_device* dev,
int device_id, int* num_configurations,
const tv_stream_config_t** configs);
/*
* open_stream:
*
* Open a stream with given stream ID. Caller owns stream object, and the
* populated data is only valid until the stream is closed.
*
* Return 0 on success; -EBUSY if the client should close other streams to
* open the stream; -EEXIST if the stream with the given ID is already open;
* -EINVAL if device_id and/or stream_id are invalid; other non-zero value
* denotes unknown error.
*/
int (*open_stream)(struct tv_input_device* dev, int device_id,
tv_stream_t* stream);
/*
* close_stream:
*
* Close a stream to a device. data in tv_stream_t* object associated with
* the stream_id is obsolete once this call finishes.
*
* Return 0 on success; -ENOENT if the stream is not open; -EINVAL if
* device_id and/or stream_id are invalid.
*/
int (*close_stream)(struct tv_input_device* dev, int device_id,
int stream_id);
/*
* request_capture:
*
* Request buffer capture for a stream. This is only valid for buffer
* producer streams. The buffer should be created with size, format and
* usage specified in the stream. Framework provides seq in an
* increasing sequence per each stream. Hardware should provide the picture
* in a chronological order according to seq. For example, if two
* requests are being processed at the same time, the request with the
* smaller seq should get an earlier frame.
*
* The framework releases the ownership of the buffer upon calling this
* function. When the buffer is filled, hardware notifies the framework
* via TV_INPUT_EVENT_CAPTURE_FINISHED callback, and the ownership is
* transferred back to framework at that time.
*
* Return 0 on success; -ENOENT if the stream is not open; -EINVAL if
* device_id and/or stream_id are invalid; -EWOULDBLOCK if HAL cannot take
* additional requests until it releases a buffer.
*/
int (*request_capture)(struct tv_input_device* dev, int device_id,
int stream_id, buffer_handle_t buffer, uint32_t seq);
/*
* cancel_capture:
*
* Cancel an ongoing capture. Hardware should release the buffer as soon as
* possible via TV_INPUT_EVENT_CAPTURE_FAILED callback.
*
* Return 0 on success; -ENOENT if the stream is not open; -EINVAL if
* device_id, stream_id, and/or seq are invalid.
*/
int (*cancel_capture)(struct tv_input_device* dev, int device_id,
int stream_id, uint32_t seq);
void* reserved[16];
} tv_input_device_t;
__END_DECLS
#endif // ANDROID_TV_INPUT_INTERFACE_H