/*
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* v4l2_device.h - v4l2 device
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*
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* Copyright (c) 2014-2015 Intel Corporation
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*
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* Author: Wind Yuan <feng.yuan@intel.com>
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*/
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#ifndef XCAM_V4L2_DEVICE_H
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#define XCAM_V4L2_DEVICE_H
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#include <xcam_std.h>
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#include <xcam_mutex.h>
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#include <linux/videodev2.h>
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#include <linux/v4l2-subdev.h>
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#include <list>
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#include <vector>
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extern "C" {
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struct v4l2_event;
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struct v4l2_format;
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struct v4l2_fmtdesc;
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struct v4l2_frmsizeenum;
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}
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namespace XCam {
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#define FMT_NUM_PLANES 1
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#define POLL_STOP_RET 3
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class V4l2Buffer;
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class V4l2Device {
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friend class V4l2BufferProxy;
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typedef std::vector<SmartPtr<V4l2Buffer>> BufferPool;
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public:
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V4l2Device (const char *name = NULL);
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virtual ~V4l2Device ();
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// before device open
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bool set_device_name (const char *name);
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bool set_sensor_id (int id);
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bool set_capture_mode (uint32_t capture_mode);
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bool set_mplanes_count (uint32_t planes_count);
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int get_fd () const {
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return _fd;
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}
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const char *get_device_name () const {
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return _name;
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}
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bool is_opened () const {
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return (_fd != -1);
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}
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bool is_activated () const {
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return _active;
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}
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// set_mem_type must before set_format
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bool set_mem_type (enum v4l2_memory type);
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enum v4l2_memory get_mem_type () const {
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return _memory_type;
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}
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bool set_buf_type (enum v4l2_buf_type type);
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bool set_buf_sync (bool sync);
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enum v4l2_buf_type get_buf_type () const {
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return _buf_type;
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}
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void get_size (uint32_t &width, uint32_t &height) const {
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width = _format.fmt.pix.width;
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height = _format.fmt.pix.height;
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}
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uint32_t get_pixel_format () const {
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return _format.fmt.pix.pixelformat;
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}
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bool set_buffer_count (uint32_t buf_count);
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int get_buffer_count () {
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return _buf_count;
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}
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int get_queued_bufcnt () {
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return _queued_bufcnt;
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}
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// set_framerate must before set_format
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bool set_framerate (uint32_t n, uint32_t d);
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void get_framerate (uint32_t &n, uint32_t &d);
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virtual XCamReturn open (bool nonblock = false);
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virtual XCamReturn close ();
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XCamReturn query_cap(struct v4l2_capability &cap);
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XCamReturn get_crop (struct v4l2_crop &crop);
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XCamReturn set_crop (struct v4l2_crop &crop);
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XCamReturn set_selection (struct v4l2_selection &select);
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// set_format
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virtual XCamReturn get_format (struct v4l2_format &format);
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XCamReturn set_format (struct v4l2_format &format);
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XCamReturn set_format (
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uint32_t width, uint32_t height, uint32_t pixelformat,
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enum v4l2_field field = V4L2_FIELD_NONE, uint32_t bytes_perline = 0);
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std::list<struct v4l2_fmtdesc> enum_formats ();
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virtual XCamReturn start (bool prepared = false);
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virtual XCamReturn stop ();
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XCamReturn prepare ();
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virtual int poll_event (int timeout_msec, int stop_fd);
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SmartPtr<V4l2Buffer> get_buffer_by_index (int index);
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virtual XCamReturn dequeue_buffer (SmartPtr<V4l2Buffer> &buf);
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virtual XCamReturn queue_buffer (SmartPtr<V4l2Buffer> &buf, bool locked = false);
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XCamReturn return_buffer (SmartPtr<V4l2Buffer> &buf);
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XCamReturn return_buffer_to_pool (SmartPtr<V4l2Buffer> &buf);
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// get free buf for type V4L2_BUF_TYPE_xxx_OUTPUT
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XCamReturn get_buffer (SmartPtr<V4l2Buffer> &buf, int index = -1) const;
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// use as less as possible
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virtual int io_control (int cmd, void *arg);
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virtual int get_use_type() { return 0;}
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virtual void set_use_type(int type) {}
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SmartPtr<V4l2Buffer> get_available_buffer ();
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virtual XCamReturn subscribe_event (int event);
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virtual XCamReturn unsubscribe_event (int event);
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virtual XCamReturn dequeue_event (struct v4l2_event &event);
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protected:
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//virtual functions, handle private actions on set_format
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virtual XCamReturn pre_set_format (struct v4l2_format &format);
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virtual XCamReturn post_set_format (struct v4l2_format &format);
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virtual XCamReturn allocate_buffer (
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SmartPtr<V4l2Buffer> &buf,
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const struct v4l2_format &format,
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const uint32_t index);
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virtual XCamReturn release_buffer (SmartPtr<V4l2Buffer> &buf);
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private:
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XCamReturn request_buffer ();
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XCamReturn init_buffer_pool ();
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XCamReturn fini_buffer_pool ();
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XCAM_DEAD_COPY (V4l2Device);
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protected:
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char *_name;
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int _fd;
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int32_t _sensor_id;
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uint32_t _capture_mode;
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enum v4l2_buf_type _buf_type;
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bool _buf_sync;
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enum v4l2_memory _memory_type;
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struct v4l2_plane *_planes;
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struct v4l2_format _format;
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uint32_t _fps_n;
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uint32_t _fps_d;
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bool _active;
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// buffer pool
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BufferPool _buf_pool;
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uint32_t _buf_count;
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uint32_t _queued_bufcnt;
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mutable Mutex _buf_mutex;
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int32_t _mplanes_count;
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XCamReturn buffer_new();
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XCamReturn buffer_del();
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};
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class V4l2SubDevice
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: public V4l2Device
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{
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public:
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explicit V4l2SubDevice (const char *name = NULL);
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virtual XCamReturn get_selection (int pad, uint32_t target, struct v4l2_subdev_selection &select);
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virtual XCamReturn setFormat(struct v4l2_subdev_format &aFormat);
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virtual XCamReturn getFormat(struct v4l2_subdev_format &aFormat);
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virtual XCamReturn set_selection (struct v4l2_subdev_selection &aSelection);
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virtual XCamReturn start (bool prepared = false);
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virtual XCamReturn stop ();
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private:
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XCAM_DEAD_COPY (V4l2SubDevice);
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};
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};
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#endif // XCAM_V4L2_DEVICE_H
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