/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * Multimedia device API * * Copyright (C) 2010 Nokia Corporation * * Contacts: Laurent Pinchart * Sakari Ailus * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #ifndef __LINUX_MEDIA_H #define __LINUX_MEDIA_H #include #include #include struct media_device_info { char driver[16]; char model[32]; char serial[40]; char bus_info[32]; __u32 media_version; __u32 hw_revision; __u32 driver_version; __u32 reserved[31]; }; /* * Base number ranges for entity functions * * NOTE: Userspace should not rely on these ranges to identify a group * of function types, as newer functions can be added with any name within * the full u32 range. * * Some older functions use the MEDIA_ENT_F_OLD_*_BASE range. Do not * change this, this is for backwards compatibility. When adding new * functions always use MEDIA_ENT_F_BASE. */ #define MEDIA_ENT_F_BASE 0x00000000 #define MEDIA_ENT_F_OLD_BASE 0x00010000 #define MEDIA_ENT_F_OLD_SUBDEV_BASE 0x00020000 /* * Initial value to be used when a new entity is created * Drivers should change it to something useful. */ #define MEDIA_ENT_F_UNKNOWN MEDIA_ENT_F_BASE /* * Subdevs are initialized with MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN in order * to preserve backward compatibility. Drivers must change to the proper * subdev type before registering the entity. */ #define MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN MEDIA_ENT_F_OLD_SUBDEV_BASE /* * DVB entity functions */ #define MEDIA_ENT_F_DTV_DEMOD (MEDIA_ENT_F_BASE + 0x00001) #define MEDIA_ENT_F_TS_DEMUX (MEDIA_ENT_F_BASE + 0x00002) #define MEDIA_ENT_F_DTV_CA (MEDIA_ENT_F_BASE + 0x00003) #define MEDIA_ENT_F_DTV_NET_DECAP (MEDIA_ENT_F_BASE + 0x00004) /* * I/O entity functions */ #define MEDIA_ENT_F_IO_V4L (MEDIA_ENT_F_OLD_BASE + 1) #define MEDIA_ENT_F_IO_DTV (MEDIA_ENT_F_BASE + 0x01001) #define MEDIA_ENT_F_IO_VBI (MEDIA_ENT_F_BASE + 0x01002) #define MEDIA_ENT_F_IO_SWRADIO (MEDIA_ENT_F_BASE + 0x01003) /* * Sensor functions */ #define MEDIA_ENT_F_CAM_SENSOR (MEDIA_ENT_F_OLD_SUBDEV_BASE + 1) #define MEDIA_ENT_F_FLASH (MEDIA_ENT_F_OLD_SUBDEV_BASE + 2) #define MEDIA_ENT_F_LENS (MEDIA_ENT_F_OLD_SUBDEV_BASE + 3) /* * Digital TV, analog TV, radio and/or software defined radio tuner functions. * * It is a responsibility of the master/bridge drivers to add connectors * and links for MEDIA_ENT_F_TUNER. Please notice that some old tuners * may require the usage of separate I2C chips to decode analog TV signals, * when the master/bridge chipset doesn't have its own TV standard decoder. * On such cases, the IF-PLL staging is mapped via one or two entities: * MEDIA_ENT_F_IF_VID_DECODER and/or MEDIA_ENT_F_IF_AUD_DECODER. */ #define MEDIA_ENT_F_TUNER (MEDIA_ENT_F_OLD_SUBDEV_BASE + 5) /* * Analog TV IF-PLL decoder functions * * It is a responsibility of the master/bridge drivers to create links * for MEDIA_ENT_F_IF_VID_DECODER and MEDIA_ENT_F_IF_AUD_DECODER. */ #define MEDIA_ENT_F_IF_VID_DECODER (MEDIA_ENT_F_BASE + 0x02001) #define MEDIA_ENT_F_IF_AUD_DECODER (MEDIA_ENT_F_BASE + 0x02002) /* * Audio entity functions */ #define MEDIA_ENT_F_AUDIO_CAPTURE (MEDIA_ENT_F_BASE + 0x03001) #define MEDIA_ENT_F_AUDIO_PLAYBACK (MEDIA_ENT_F_BASE + 0x03002) #define MEDIA_ENT_F_AUDIO_MIXER (MEDIA_ENT_F_BASE + 0x03003) /* * Processing entity functions */ #define MEDIA_ENT_F_PROC_VIDEO_COMPOSER (MEDIA_ENT_F_BASE + 0x4001) #define MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER (MEDIA_ENT_F_BASE + 0x4002) #define MEDIA_ENT_F_PROC_VIDEO_PIXEL_ENC_CONV (MEDIA_ENT_F_BASE + 0x4003) #define MEDIA_ENT_F_PROC_VIDEO_LUT (MEDIA_ENT_F_BASE + 0x4004) #define MEDIA_ENT_F_PROC_VIDEO_SCALER (MEDIA_ENT_F_BASE + 0x4005) #define MEDIA_ENT_F_PROC_VIDEO_STATISTICS (MEDIA_ENT_F_BASE + 0x4006) #define MEDIA_ENT_F_PROC_VIDEO_ENCODER (MEDIA_ENT_F_BASE + 0x4007) #define MEDIA_ENT_F_PROC_VIDEO_DECODER (MEDIA_ENT_F_BASE + 0x4008) /* * Switch and bridge entity functions */ #define MEDIA_ENT_F_VID_MUX (MEDIA_ENT_F_BASE + 0x5001) #define MEDIA_ENT_F_VID_IF_BRIDGE (MEDIA_ENT_F_BASE + 0x5002) /* * Video decoder/encoder functions */ #define MEDIA_ENT_F_ATV_DECODER (MEDIA_ENT_F_OLD_SUBDEV_BASE + 4) #define MEDIA_ENT_F_DV_DECODER (MEDIA_ENT_F_BASE + 0x6001) #define MEDIA_ENT_F_DV_ENCODER (MEDIA_ENT_F_BASE + 0x6002) /* Entity flags */ #define MEDIA_ENT_FL_DEFAULT (1 << 0) #define MEDIA_ENT_FL_CONNECTOR (1 << 1) /* OR with the entity id value to find the next entity */ #define MEDIA_ENT_ID_FLAG_NEXT (1U << 31) struct media_entity_desc { __u32 id; char name[32]; __u32 type; __u32 revision; __u32 flags; __u32 group_id; __u16 pads; __u16 links; __u32 reserved[4]; union { /* Node specifications */ struct { __u32 major; __u32 minor; } dev; /* * TODO: this shouldn't have been added without * actual drivers that use this. When the first real driver * appears that sets this information, special attention * should be given whether this information is 1) enough, and * 2) can deal with udev rules that rename devices. The struct * dev would not be sufficient for this since that does not * contain the subdevice information. In addition, struct dev * can only refer to a single device, and not to multiple (e.g. * pcm and mixer devices). */ struct { __u32 card; __u32 device; __u32 subdevice; } alsa; /* * DEPRECATED: previous node specifications. Kept just to * avoid breaking compilation. Use media_entity_desc.dev * instead. */ struct { __u32 major; __u32 minor; } v4l; struct { __u32 major; __u32 minor; } fb; int dvb; /* Sub-device specifications */ /* Nothing needed yet */ __u8 raw[184]; }; }; #define MEDIA_PAD_FL_SINK (1 << 0) #define MEDIA_PAD_FL_SOURCE (1 << 1) #define MEDIA_PAD_FL_MUST_CONNECT (1 << 2) struct media_pad_desc { __u32 entity; /* entity ID */ __u16 index; /* pad index */ __u32 flags; /* pad flags */ __u32 reserved[2]; }; #define MEDIA_LNK_FL_ENABLED (1 << 0) #define MEDIA_LNK_FL_IMMUTABLE (1 << 1) #define MEDIA_LNK_FL_DYNAMIC (1 << 2) #define MEDIA_LNK_FL_LINK_TYPE (0xf << 28) # define MEDIA_LNK_FL_DATA_LINK (0 << 28) # define MEDIA_LNK_FL_INTERFACE_LINK (1 << 28) struct media_link_desc { struct media_pad_desc source; struct media_pad_desc sink; __u32 flags; __u32 reserved[2]; }; struct media_links_enum { __u32 entity; /* Should have enough room for pads elements */ struct media_pad_desc *pads; /* Should have enough room for links elements */ struct media_link_desc *links; __u32 reserved[4]; }; /* Interface type ranges */ #define MEDIA_INTF_T_DVB_BASE 0x00000100 #define MEDIA_INTF_T_V4L_BASE 0x00000200 /* Interface types */ #define MEDIA_INTF_T_DVB_FE (MEDIA_INTF_T_DVB_BASE) #define MEDIA_INTF_T_DVB_DEMUX (MEDIA_INTF_T_DVB_BASE + 1) #define MEDIA_INTF_T_DVB_DVR (MEDIA_INTF_T_DVB_BASE + 2) #define MEDIA_INTF_T_DVB_CA (MEDIA_INTF_T_DVB_BASE + 3) #define MEDIA_INTF_T_DVB_NET (MEDIA_INTF_T_DVB_BASE + 4) #define MEDIA_INTF_T_V4L_VIDEO (MEDIA_INTF_T_V4L_BASE) #define MEDIA_INTF_T_V4L_VBI (MEDIA_INTF_T_V4L_BASE + 1) #define MEDIA_INTF_T_V4L_RADIO (MEDIA_INTF_T_V4L_BASE + 2) #define MEDIA_INTF_T_V4L_SUBDEV (MEDIA_INTF_T_V4L_BASE + 3) #define MEDIA_INTF_T_V4L_SWRADIO (MEDIA_INTF_T_V4L_BASE + 4) #define MEDIA_INTF_T_V4L_TOUCH (MEDIA_INTF_T_V4L_BASE + 5) #define MEDIA_INTF_T_ALSA_BASE 0x00000300 #define MEDIA_INTF_T_ALSA_PCM_CAPTURE (MEDIA_INTF_T_ALSA_BASE) #define MEDIA_INTF_T_ALSA_PCM_PLAYBACK (MEDIA_INTF_T_ALSA_BASE + 1) #define MEDIA_INTF_T_ALSA_CONTROL (MEDIA_INTF_T_ALSA_BASE + 2) /* * MC next gen API definitions */ /* * Appeared in 4.19.0. * * The media_version argument comes from the media_version field in * struct media_device_info. */ #define MEDIA_V2_ENTITY_HAS_FLAGS(media_version) \ ((media_version) >= ((4 << 16) | (19 << 8) | 0)) struct media_v2_entity { __u32 id; char name[64]; __u32 function; /* Main function of the entity */ __u32 flags; __u32 reserved[5]; } __attribute__ ((packed)); /* Should match the specific fields at media_intf_devnode */ struct media_v2_intf_devnode { __u32 major; __u32 minor; } __attribute__ ((packed)); struct media_v2_interface { __u32 id; __u32 intf_type; __u32 flags; __u32 reserved[9]; union { struct media_v2_intf_devnode devnode; __u32 raw[16]; }; } __attribute__ ((packed)); /* * Appeared in 4.19.0. * * The media_version argument comes from the media_version field in * struct media_device_info. */ #define MEDIA_V2_PAD_HAS_INDEX(media_version) \ ((media_version) >= ((4 << 16) | (19 << 8) | 0)) struct media_v2_pad { __u32 id; __u32 entity_id; __u32 flags; __u32 index; __u32 reserved[4]; } __attribute__ ((packed)); struct media_v2_link { __u32 id; __u32 source_id; __u32 sink_id; __u32 flags; __u32 reserved[6]; } __attribute__ ((packed)); struct media_v2_topology { __u64 topology_version; __u32 num_entities; __u32 reserved1; __u64 ptr_entities; __u32 num_interfaces; __u32 reserved2; __u64 ptr_interfaces; __u32 num_pads; __u32 reserved3; __u64 ptr_pads; __u32 num_links; __u32 reserved4; __u64 ptr_links; } __attribute__ ((packed)); /* ioctls */ #define MEDIA_IOC_DEVICE_INFO _IOWR('|', 0x00, struct media_device_info) #define MEDIA_IOC_ENUM_ENTITIES _IOWR('|', 0x01, struct media_entity_desc) #define MEDIA_IOC_ENUM_LINKS _IOWR('|', 0x02, struct media_links_enum) #define MEDIA_IOC_SETUP_LINK _IOWR('|', 0x03, struct media_link_desc) #define MEDIA_IOC_G_TOPOLOGY _IOWR('|', 0x04, struct media_v2_topology) #define MEDIA_IOC_REQUEST_ALLOC _IOR ('|', 0x05, int) /* * These ioctls are called on the request file descriptor as returned * by MEDIA_IOC_REQUEST_ALLOC. */ #define MEDIA_REQUEST_IOC_QUEUE _IO('|', 0x80) #define MEDIA_REQUEST_IOC_REINIT _IO('|', 0x81) /* * Legacy symbols used to avoid userspace compilation breakages. * Do not use any of this in new applications! * * Those symbols map the entity function into types and should be * used only on legacy programs for legacy hardware. Don't rely * on those for MEDIA_IOC_G_TOPOLOGY. */ #define MEDIA_ENT_TYPE_SHIFT 16 #define MEDIA_ENT_TYPE_MASK 0x00ff0000 #define MEDIA_ENT_SUBTYPE_MASK 0x0000ffff #define MEDIA_ENT_T_DEVNODE_UNKNOWN (MEDIA_ENT_F_OLD_BASE | \ MEDIA_ENT_SUBTYPE_MASK) #define MEDIA_ENT_T_DEVNODE MEDIA_ENT_F_OLD_BASE #define MEDIA_ENT_T_DEVNODE_V4L MEDIA_ENT_F_IO_V4L #define MEDIA_ENT_T_DEVNODE_FB (MEDIA_ENT_F_OLD_BASE + 2) #define MEDIA_ENT_T_DEVNODE_ALSA (MEDIA_ENT_F_OLD_BASE + 3) #define MEDIA_ENT_T_DEVNODE_DVB (MEDIA_ENT_F_OLD_BASE + 4) #define MEDIA_ENT_T_UNKNOWN MEDIA_ENT_F_UNKNOWN #define MEDIA_ENT_T_V4L2_VIDEO MEDIA_ENT_F_IO_V4L #define MEDIA_ENT_T_V4L2_SUBDEV MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN #define MEDIA_ENT_T_V4L2_SUBDEV_SENSOR MEDIA_ENT_F_CAM_SENSOR #define MEDIA_ENT_T_V4L2_SUBDEV_FLASH MEDIA_ENT_F_FLASH #define MEDIA_ENT_T_V4L2_SUBDEV_LENS MEDIA_ENT_F_LENS #define MEDIA_ENT_T_V4L2_SUBDEV_DECODER MEDIA_ENT_F_ATV_DECODER #define MEDIA_ENT_T_V4L2_SUBDEV_TUNER MEDIA_ENT_F_TUNER #define MEDIA_ENT_F_DTV_DECODER MEDIA_ENT_F_DV_DECODER /* * There is still no full ALSA support in the media controller. These * defines should not have been added and we leave them here only * in case some application tries to use these defines. * * The ALSA defines that are in use have been moved into __KERNEL__ * scope. As support gets added to these interface types, they should * be moved into __KERNEL__ scope with the code that uses them. */ #define MEDIA_INTF_T_ALSA_COMPRESS (MEDIA_INTF_T_ALSA_BASE + 3) #define MEDIA_INTF_T_ALSA_RAWMIDI (MEDIA_INTF_T_ALSA_BASE + 4) #define MEDIA_INTF_T_ALSA_HWDEP (MEDIA_INTF_T_ALSA_BASE + 5) #define MEDIA_INTF_T_ALSA_SEQUENCER (MEDIA_INTF_T_ALSA_BASE + 6) #define MEDIA_INTF_T_ALSA_TIMER (MEDIA_INTF_T_ALSA_BASE + 7) /* Obsolete symbol for media_version, no longer used in the kernel */ #define MEDIA_API_VERSION ((0 << 16) | (1 << 8) | 0) #endif /* __LINUX_MEDIA_H */ ef='#n287'>287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * Proxy to V4L2 compatibility camera
 */

#include "v4l2_camera_proxy.h"

#include <algorithm>
#include <array>
#include <errno.h>
#include <numeric>
#include <set>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>

#include <linux/videodev2.h>

#include <libcamera/base/log.h>
#include <libcamera/base/object.h>
#include <libcamera/base/utils.h>

#include <libcamera/camera.h>
#include <libcamera/formats.h>

#include "libcamera/internal/formats.h"

#include "v4l2_camera.h"
#include "v4l2_camera_file.h"
#include "v4l2_compat_manager.h"

#define KERNEL_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))

using namespace libcamera;

LOG_DECLARE_CATEGORY(V4L2Compat)

V4L2CameraProxy::V4L2CameraProxy(unsigned int index,
				 std::shared_ptr<Camera> camera)
	: refcount_(0), index_(index), bufferCount_(0), currentBuf_(0),
	  vcam_(std::make_unique<V4L2Camera>(camera)), owner_(nullptr)
{
	querycap(camera);
}

int V4L2CameraProxy::open(V4L2CameraFile *file)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	MutexLocker locker(proxyMutex_);

	if (refcount_++) {
		files_.insert(file);
		return 0;
	}

	/*
	 * We open the camera here, once, and keep it open until the last
	 * V4L2CameraFile is closed. The proxy is initially not owned by any
	 * file. The first file that calls reqbufs with count > 0 or s_fmt
	 * will become the owner, and no other file will be allowed to call
	 * buffer-related ioctls (except querybuf), set the format, or start or
	 * stop the stream until ownership is released with a call to reqbufs
	 * with count = 0.
	 */

	int ret = vcam_->open(&streamConfig_);
	if (ret < 0) {
		refcount_--;
		return ret;
	}

	setFmtFromConfig(streamConfig_);

	files_.insert(file);

	return 0;
}

void V4L2CameraProxy::close(V4L2CameraFile *file)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	MutexLocker locker(proxyMutex_);

	files_.erase(file);

	release(file);

	if (--refcount_ > 0)
		return;

	vcam_->close();
}

void *V4L2CameraProxy::mmap(V4L2CameraFile *file, void *addr, size_t length,
			    int prot, int flags, off64_t offset)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	MutexLocker locker(proxyMutex_);

	/*
	 * Mimic the videobuf2 behaviour, which requires PROT_READ and
	 * MAP_SHARED.
	 */
	if (!(prot & PROT_READ)) {
		errno = EINVAL;
		return MAP_FAILED;
	}

	if (!(flags & MAP_SHARED)) {
		errno = EINVAL;
		return MAP_FAILED;
	}

	unsigned int index = offset / sizeimage_;
	if (static_cast<off_t>(index * sizeimage_) != offset ||
	    length != sizeimage_) {
		errno = EINVAL;
		return MAP_FAILED;
	}

	int fd = vcam_->getBufferFd(index);
	if (fd < 0) {
		errno = EINVAL;
		return MAP_FAILED;
	}

	void *map = V4L2CompatManager::instance()->fops().mmap(addr, length, prot,
							       flags, fd, 0);
	if (map == MAP_FAILED)
		return map;

	buffers_[index].flags |= V4L2_BUF_FLAG_MAPPED;
	mmaps_[map] = index;

	return map;
}

int V4L2CameraProxy::munmap(V4L2CameraFile *file, void *addr, size_t length)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	MutexLocker locker(proxyMutex_);

	auto iter = mmaps_.find(addr);
	if (iter == mmaps_.end() || length != sizeimage_) {
		errno = EINVAL;
		return -1;
	}

	if (V4L2CompatManager::instance()->fops().munmap(addr, length))
		LOG(V4L2Compat, Error) << "Failed to unmap " << addr
				       << " with length " << length;

	buffers_[iter->second].flags &= ~V4L2_BUF_FLAG_MAPPED;
	mmaps_.erase(iter);

	return 0;
}

bool V4L2CameraProxy::validateBufferType(uint32_t type)
{
	return type == V4L2_BUF_TYPE_VIDEO_CAPTURE;
}

bool V4L2CameraProxy::validateMemoryType(uint32_t memory)
{
	return memory == V4L2_MEMORY_MMAP;
}

void V4L2CameraProxy::setFmtFromConfig(const StreamConfiguration &streamConfig)
{
	const Size &size = streamConfig.size;

	v4l2PixFormat_.width        = size.width;
	v4l2PixFormat_.height       = size.height;
	v4l2PixFormat_.pixelformat  = V4L2PixelFormat::fromPixelFormat(streamConfig.pixelFormat)[0];
	v4l2PixFormat_.field        = V4L2_FIELD_NONE;
	v4l2PixFormat_.bytesperline = streamConfig.stride;
	v4l2PixFormat_.sizeimage    = streamConfig.frameSize;
	v4l2PixFormat_.colorspace   = V4L2_COLORSPACE_SRGB;
	v4l2PixFormat_.priv         = V4L2_PIX_FMT_PRIV_MAGIC;
	v4l2PixFormat_.ycbcr_enc    = V4L2_YCBCR_ENC_DEFAULT;
	v4l2PixFormat_.quantization = V4L2_QUANTIZATION_DEFAULT;
	v4l2PixFormat_.xfer_func    = V4L2_XFER_FUNC_DEFAULT;

	sizeimage_ = streamConfig.frameSize;
}

void V4L2CameraProxy::querycap(std::shared_ptr<Camera> camera)
{
	std::string driver = "libcamera";
	std::string bus_info = driver + ":" + std::to_string(index_);

	utils::strlcpy(reinterpret_cast<char *>(capabilities_.driver), driver.c_str(),
		       sizeof(capabilities_.driver));
	utils::strlcpy(reinterpret_cast<char *>(capabilities_.card), camera->id().c_str(),
		       sizeof(capabilities_.card));
	utils::strlcpy(reinterpret_cast<char *>(capabilities_.bus_info), bus_info.c_str(),
		       sizeof(capabilities_.bus_info));
	/* \todo Put this in a header/config somewhere. */
	capabilities_.version = KERNEL_VERSION(5, 2, 0);
	capabilities_.device_caps = V4L2_CAP_VIDEO_CAPTURE
				  | V4L2_CAP_STREAMING
				  | V4L2_CAP_EXT_PIX_FORMAT;
	capabilities_.capabilities = capabilities_.device_caps
				   | V4L2_CAP_DEVICE_CAPS;
	memset(capabilities_.reserved, 0, sizeof(capabilities_.reserved));
}

void V4L2CameraProxy::updateBuffers()
{
	std::vector<V4L2Camera::Buffer> completedBuffers = vcam_->completedBuffers();
	for (const V4L2Camera::Buffer &buffer : completedBuffers) {
		const FrameMetadata &fmd = buffer.data_;
		struct v4l2_buffer &buf = buffers_[buffer.index_];

		switch (fmd.status) {
		case FrameMetadata::FrameSuccess:
			buf.bytesused = std::accumulate(fmd.planes().begin(),
							fmd.planes().end(), 0,
							[](unsigned int total, const auto &plane) {
								return total + plane.bytesused;
							});
			buf.field = V4L2_FIELD_NONE;
			buf.timestamp.tv_sec = fmd.timestamp / 1000000000;
			buf.timestamp.tv_usec = (fmd.timestamp / 1000) % 1000000;
			buf.sequence = fmd.sequence;

			buf.flags |= V4L2_BUF_FLAG_DONE;
			break;
		case FrameMetadata::FrameError:
			buf.flags |= V4L2_BUF_FLAG_ERROR;
			break;
		default:
			break;
		}
	}
}

int V4L2CameraProxy::vidioc_querycap(V4L2CameraFile *file, struct v4l2_capability *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	*arg = capabilities_;

	return 0;
}

int V4L2CameraProxy::vidioc_enum_framesizes(V4L2CameraFile *file, struct v4l2_frmsizeenum *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	V4L2PixelFormat v4l2Format = V4L2PixelFormat(arg->pixel_format);
	PixelFormat format = v4l2Format.toPixelFormat();
	/*
	 * \todo This might need to be expanded as few pipeline handlers
	 * report StreamFormats.
	 */
	const std::vector<Size> &frameSizes = streamConfig_.formats().sizes(format);

	if (arg->index >= frameSizes.size())
		return -EINVAL;

	arg->type = V4L2_FRMSIZE_TYPE_DISCRETE;
	arg->discrete.width = frameSizes[arg->index].width;
	arg->discrete.height = frameSizes[arg->index].height;
	memset(arg->reserved, 0, sizeof(arg->reserved));

	return 0;
}

int V4L2CameraProxy::vidioc_enum_fmt(V4L2CameraFile *file, struct v4l2_fmtdesc *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (!validateBufferType(arg->type) ||
	    arg->index >= streamConfig_.formats().pixelformats().size())
		return -EINVAL;

	PixelFormat format = streamConfig_.formats().pixelformats()[arg->index];
	V4L2PixelFormat v4l2Format = V4L2PixelFormat::fromPixelFormat(format)[0];

	arg->flags = format == formats::MJPEG ? V4L2_FMT_FLAG_COMPRESSED : 0;
	utils::strlcpy(reinterpret_cast<char *>(arg->description),
		       v4l2Format.description(), sizeof(arg->description));
	arg->pixelformat = v4l2Format;

	memset(arg->reserved, 0, sizeof(arg->reserved));

	return 0;
}

int V4L2CameraProxy::vidioc_g_fmt(V4L2CameraFile *file, struct v4l2_format *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (!validateBufferType(arg->type))
		return -EINVAL;

	memset(&arg->fmt, 0, sizeof(arg->fmt));
	arg->fmt.pix = v4l2PixFormat_;

	return 0;
}

int V4L2CameraProxy::tryFormat(struct v4l2_format *arg)
{
	V4L2PixelFormat v4l2Format = V4L2PixelFormat(arg->fmt.pix.pixelformat);
	PixelFormat format = v4l2Format.toPixelFormat();
	Size size(arg->fmt.pix.width, arg->fmt.pix.height);

	StreamConfiguration config;
	int ret = vcam_->validateConfiguration(format, size, &config);
	if (ret < 0) {
		LOG(V4L2Compat, Error)
			<< "Failed to negotiate a valid format: "
			<< format;
		return -EINVAL;
	}

	arg->fmt.pix.width        = config.size.width;
	arg->fmt.pix.height       = config.size.height;
	arg->fmt.pix.pixelformat  = V4L2PixelFormat::fromPixelFormat(config.pixelFormat)[0];
	arg->fmt.pix.field        = V4L2_FIELD_NONE;
	arg->fmt.pix.bytesperline = config.stride;
	arg->fmt.pix.sizeimage    = config.frameSize;
	arg->fmt.pix.colorspace   = V4L2_COLORSPACE_SRGB;
	arg->fmt.pix.priv         = V4L2_PIX_FMT_PRIV_MAGIC;
	arg->fmt.pix.ycbcr_enc    = V4L2_YCBCR_ENC_DEFAULT;
	arg->fmt.pix.quantization = V4L2_QUANTIZATION_DEFAULT;
	arg->fmt.pix.xfer_func    = V4L2_XFER_FUNC_DEFAULT;

	return 0;
}

int V4L2CameraProxy::vidioc_s_fmt(V4L2CameraFile *file, struct v4l2_format *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (!validateBufferType(arg->type))
		return -EINVAL;

	if (file->priority() < maxPriority())
		return -EBUSY;

	int ret = acquire(file);
	if (ret < 0)
		return ret;

	ret = tryFormat(arg);
	if (ret < 0)
		return ret;

	Size size(arg->fmt.pix.width, arg->fmt.pix.height);
	V4L2PixelFormat v4l2Format = V4L2PixelFormat(arg->fmt.pix.pixelformat);
	ret = vcam_->configure(&streamConfig_, size, v4l2Format.toPixelFormat(),
			       bufferCount_);
	if (ret < 0)
		return -EINVAL;

	setFmtFromConfig(streamConfig_);

	return 0;
}

int V4L2CameraProxy::vidioc_try_fmt(V4L2CameraFile *file, struct v4l2_format *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (!validateBufferType(arg->type))
		return -EINVAL;

	int ret = tryFormat(arg);
	if (ret < 0)
		return ret;

	return 0;
}

enum v4l2_priority V4L2CameraProxy::maxPriority()
{
	auto max = std::max_element(files_.begin(), files_.end(),
				    [](const V4L2CameraFile *a, const V4L2CameraFile *b) {
					    return a->priority() < b->priority();
				    });
	return max != files_.end() ? (*max)->priority() : V4L2_PRIORITY_UNSET;
}

int V4L2CameraProxy::vidioc_g_priority(V4L2CameraFile *file, enum v4l2_priority *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	*arg = maxPriority();

	return 0;
}

int V4L2CameraProxy::vidioc_s_priority(V4L2CameraFile *file, enum v4l2_priority *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (*arg > V4L2_PRIORITY_RECORD)
		return -EINVAL;

	if (file->priority() < maxPriority())
		return -EBUSY;

	file->setPriority(*arg);

	return 0;
}

int V4L2CameraProxy::vidioc_enuminput(V4L2CameraFile *file, struct v4l2_input *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (arg->index != 0)
		return -EINVAL;

	memset(arg, 0, sizeof(*arg));

	utils::strlcpy(reinterpret_cast<char *>(arg->name),
		       reinterpret_cast<char *>(capabilities_.card),
		       sizeof(arg->name));
	arg->type = V4L2_INPUT_TYPE_CAMERA;

	return 0;
}

int V4L2CameraProxy::vidioc_g_input(V4L2CameraFile *file, int *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	*arg = 0;

	return 0;
}

int V4L2CameraProxy::vidioc_s_input(V4L2CameraFile *file, int *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (*arg != 0)
		return -EINVAL;

	return 0;
}

void V4L2CameraProxy::freeBuffers()
{
	vcam_->freeBuffers();
	buffers_.clear();
	bufferCount_ = 0;
}

int V4L2CameraProxy::vidioc_reqbufs(V4L2CameraFile *file, struct v4l2_requestbuffers *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (!validateBufferType(arg->type) ||
	    !validateMemoryType(arg->memory))
		return -EINVAL;

	LOG(V4L2Compat, Debug) << arg->count << " buffers requested ";

	if (file->priority() < maxPriority())
		return -EBUSY;

	if (!hasOwnership(file) && owner_)
		return -EBUSY;

	arg->capabilities = V4L2_BUF_CAP_SUPPORTS_MMAP;
	arg->flags = 0;
	memset(arg->reserved, 0, sizeof(arg->reserved));

	if (arg->count == 0) {
		/* \todo Add buffer orphaning support */
		if (!mmaps_.empty())
			return -EBUSY;

		if (vcam_->isRunning())
			return -EBUSY;

		freeBuffers();
		release(file);

		return 0;
	}

	if (bufferCount_ > 0)
		freeBuffers();

	Size size(v4l2PixFormat_.width, v4l2PixFormat_.height);
	V4L2PixelFormat v4l2Format = V4L2PixelFormat(v4l2PixFormat_.pixelformat);
	int ret = vcam_->configure(&streamConfig_, size,
				   v4l2Format.toPixelFormat(), arg->count);
	if (ret < 0)
		return -EINVAL;

	setFmtFromConfig(streamConfig_);

	arg->count = streamConfig_.bufferCount;
	bufferCount_ = arg->count;

	ret = vcam_->allocBuffers(arg->count);
	if (ret < 0) {
		arg->count = 0;
		return ret;
	}

	buffers_.resize(arg->count);
	for (unsigned int i = 0; i < arg->count; i++) {
		struct v4l2_buffer buf = {};
		buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		buf.length = v4l2PixFormat_.sizeimage;
		buf.memory = V4L2_MEMORY_MMAP;
		buf.m.offset = i * v4l2PixFormat_.sizeimage;
		buf.index = i;
		buf.flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;

		buffers_[i] = buf;
	}

	LOG(V4L2Compat, Debug) << "Allocated " << arg->count << " buffers";

	acquire(file);

	return 0;
}

int V4L2CameraProxy::vidioc_querybuf(V4L2CameraFile *file, struct v4l2_buffer *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (arg->index >= bufferCount_)
		return -EINVAL;

	if (!validateBufferType(arg->type) ||
	    arg->index >= bufferCount_)
		return -EINVAL;

	updateBuffers();

	*arg = buffers_[arg->index];

	return 0;
}

int V4L2CameraProxy::vidioc_prepare_buf(V4L2CameraFile *file, struct v4l2_buffer *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__
		<< "(index=" << arg->index << ")";

	if (!hasOwnership(file))
		return -EBUSY;

	if (arg->index >= bufferCount_)
		return -EINVAL;

	if (arg->flags & V4L2_BUF_FLAG_REQUEST_FD)
		return -EINVAL;

	if (!validateBufferType(arg->type) ||
	    !validateMemoryType(arg->memory))
		return -EINVAL;

	struct v4l2_buffer &buffer = buffers_[arg->index];

	if (buffer.flags & V4L2_BUF_FLAG_QUEUED ||
	    buffer.flags & V4L2_BUF_FLAG_PREPARED)
		return -EINVAL;

	buffer.flags |= V4L2_BUF_FLAG_PREPARED;

	arg->flags = buffer.flags;

	return 0;
}

int V4L2CameraProxy::vidioc_qbuf(V4L2CameraFile *file, struct v4l2_buffer *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__
		<< "(index=" << arg->index << ")";

	if (arg->index >= bufferCount_)
		return -EINVAL;

	if (buffers_[arg->index].flags & V4L2_BUF_FLAG_QUEUED)
		return -EINVAL;

	if (!hasOwnership(file))
		return -EBUSY;

	if (!validateBufferType(arg->type) ||
	    !validateMemoryType(arg->memory) ||
	    arg->index >= bufferCount_)
		return -EINVAL;

	int ret = vcam_->qbuf(arg->index);
	if (ret < 0)
		return ret;

	buffers_[arg->index].flags |= V4L2_BUF_FLAG_QUEUED;

	arg->flags = buffers_[arg->index].flags;

	return ret;
}

int V4L2CameraProxy::vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,
				  Mutex *lock)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (arg->index >= bufferCount_)
		return -EINVAL;

	if (!hasOwnership(file))
		return -EBUSY;

	if (!vcam_->isRunning())
		return -EINVAL;

	if (!validateBufferType(arg->type) ||
	    !validateMemoryType(arg->memory))
		return -EINVAL;

	if (!file->nonBlocking()) {
		lock->unlock();
		vcam_->waitForBufferAvailable();
		lock->lock();
	} else if (!vcam_->isBufferAvailable())
		return -EAGAIN;

	/*
	 * We need to check here again in case stream was turned off while we
	 * were blocked on waitForBufferAvailable().
	 */
	if (!vcam_->isRunning())
		return -EINVAL;

	updateBuffers();

	struct v4l2_buffer &buf = buffers_[currentBuf_];

	buf.flags &= ~(V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_PREPARED);
	buf.length = sizeimage_;
	*arg = buf;

	currentBuf_ = (currentBuf_ + 1) % bufferCount_;

	uint64_t data;
	int ret = ::read(file->efd(), &data, sizeof(data));
	if (ret != sizeof(data))
		LOG(V4L2Compat, Error) << "Failed to clear eventfd POLLIN";

	return 0;
}

int V4L2CameraProxy::vidioc_expbuf(V4L2CameraFile *file, struct v4l2_exportbuffer *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (!hasOwnership(file))
		return -EBUSY;

	/* \todo Verify that the memory type is MMAP when adding DMABUF support */
	if (!validateBufferType(arg->type))
		return -EINVAL;

	if (arg->index >= bufferCount_)
		return -EINVAL;

	if (arg->flags & ~(O_CLOEXEC | O_ACCMODE))
		return -EINVAL;

	memset(arg->reserved, 0, sizeof(arg->reserved));

	/* \todo honor the O_ACCMODE flags passed to this function */
	arg->fd = fcntl(vcam_->getBufferFd(arg->index),
			arg->flags & O_CLOEXEC ? F_DUPFD_CLOEXEC : F_DUPFD, 0);

	return 0;
}

int V4L2CameraProxy::vidioc_streamon(V4L2CameraFile *file, int *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (bufferCount_ == 0)
		return -EINVAL;

	if (!validateBufferType(*arg))
		return -EINVAL;

	if (file->priority() < maxPriority())
		return -EBUSY;

	if (!hasOwnership(file))
		return -EBUSY;

	if (vcam_->isRunning())
		return 0;

	currentBuf_ = 0;

	return vcam_->streamOn();
}

int V4L2CameraProxy::vidioc_streamoff(V4L2CameraFile *file, int *arg)
{
	LOG(V4L2Compat, Debug)
		<< "[" << file->description() << "] " << __func__ << "()";

	if (!validateBufferType(*arg))
		return -EINVAL;

	if (file->priority() < maxPriority())
		return -EBUSY;

	if (!hasOwnership(file) && owner_)
		return -EBUSY;

	int ret = vcam_->streamOff();

	for (struct v4l2_buffer &buf : buffers_)
		buf.flags &= ~(V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE);

	return ret;
}

const std::set<unsigned long> V4L2CameraProxy::supportedIoctls_ = {
	VIDIOC_QUERYCAP,
	VIDIOC_ENUM_FRAMESIZES,
	VIDIOC_ENUM_FMT,
	VIDIOC_G_FMT,
	VIDIOC_S_FMT,
	VIDIOC_TRY_FMT,
	VIDIOC_G_PRIORITY,
	VIDIOC_S_PRIORITY,
	VIDIOC_ENUMINPUT,
	VIDIOC_G_INPUT,
	VIDIOC_S_INPUT,
	VIDIOC_REQBUFS,
	VIDIOC_QUERYBUF,
	VIDIOC_PREPARE_BUF,
	VIDIOC_QBUF,
	VIDIOC_DQBUF,
	VIDIOC_EXPBUF,
	VIDIOC_STREAMON,
	VIDIOC_STREAMOFF,
};

int V4L2CameraProxy::ioctl(V4L2CameraFile *file, unsigned long longRequest, void *arg)
{
	MutexLocker locker(proxyMutex_);

	/*
	 * The Linux Kernel only processes 32 bits of an IOCTL.
	 *
	 * Prevent unexpected sign-extensions that could occur if applications
	 * use a signed int for the ioctl request, which would sign-extend to
	 * an incorrect value for unsigned longs on 64 bit architectures by
	 * explicitly casting as an unsigned int here.
	 */
	unsigned int request = longRequest;

	if (!arg && (_IOC_DIR(request) & _IOC_WRITE)) {
		errno = EFAULT;
		return -1;
	}

	if (supportedIoctls_.find(request) == supportedIoctls_.end()) {
		errno = ENOTTY;
		return -1;
	}

	if (!arg && (_IOC_DIR(request) & _IOC_READ)) {
		errno = EFAULT;
		return -1;
	}

	int ret;
	switch (request) {
	case VIDIOC_QUERYCAP:
		ret = vidioc_querycap(file, static_cast<struct v4l2_capability *>(arg));
		break;
	case VIDIOC_ENUM_FRAMESIZES:
		ret = vidioc_enum_framesizes(file, static_cast<struct v4l2_frmsizeenum *>(arg));
		break;
	case VIDIOC_ENUM_FMT:
		ret = vidioc_enum_fmt(file, static_cast<struct v4l2_fmtdesc *>(arg));
		break;
	case VIDIOC_G_FMT:
		ret = vidioc_g_fmt(file, static_cast<struct v4l2_format *>(arg));
		break;
	case VIDIOC_S_FMT:
		ret = vidioc_s_fmt(file, static_cast<struct v4l2_format *>(arg));
		break;
	case VIDIOC_TRY_FMT:
		ret = vidioc_try_fmt(file, static_cast<struct v4l2_format *>(arg));
		break;
	case VIDIOC_G_PRIORITY:
		ret = vidioc_g_priority(file, static_cast<enum v4l2_priority *>(arg));
		break;
	case VIDIOC_S_PRIORITY:
		ret = vidioc_s_priority(file, static_cast<enum v4l2_priority *>(arg));
		break;
	case VIDIOC_ENUMINPUT:
		ret = vidioc_enuminput(file, static_cast<struct v4l2_input *>(arg));
		break;
	case VIDIOC_G_INPUT:
		ret = vidioc_g_input(file, static_cast<int *>(arg));
		break;
	case VIDIOC_S_INPUT:
		ret = vidioc_s_input(file, static_cast<int *>(arg));
		break;
	case VIDIOC_REQBUFS:
		ret = vidioc_reqbufs(file, static_cast<struct v4l2_requestbuffers *>(arg));
		break;
	case VIDIOC_QUERYBUF:
		ret = vidioc_querybuf(file, static_cast<struct v4l2_buffer *>(arg));
		break;
	case VIDIOC_QBUF:
		ret = vidioc_qbuf(file, static_cast<struct v4l2_buffer *>(arg));
		break;
	case VIDIOC_DQBUF:
		ret = vidioc_dqbuf(file, static_cast<struct v4l2_buffer *>(arg), &proxyMutex_);
		break;
	case VIDIOC_EXPBUF:
		ret = vidioc_expbuf(file, static_cast<struct v4l2_exportbuffer *>(arg));
		break;
	case VIDIOC_STREAMON:
		ret = vidioc_streamon(file, static_cast<int *>(arg));
		break;
	case VIDIOC_STREAMOFF:
		ret = vidioc_streamoff(file, static_cast<int *>(arg));
		break;
	default:
		ret = -ENOTTY;
		break;
	}

	if (ret < 0) {
		errno = -ret;
		return -1;
	}

	return ret;
}

bool V4L2CameraProxy::hasOwnership(V4L2CameraFile *file)
{
	return owner_ == file;
}

/**
 * \brief Acquire exclusive ownership of the V4L2Camera
 *
 * \return Zero on success or if already acquired, and negative error on
 * failure.
 *
 * This is sufficient for poll()ing for buffers. Events, however, are signaled
 * on the file level, so all fds must be signaled. poll()ing from a different
 * fd than the one that locks the device is a corner case, and is currently not
 * supported.
 */
int V4L2CameraProxy::acquire(V4L2CameraFile *file)
{
	if (owner_ == file)
		return 0;

	if (owner_)
		return -EBUSY;

	vcam_->bind(file->efd());

	owner_ = file;

	return 0;
}

void V4L2CameraProxy::release(V4L2CameraFile *file)
{
	if (owner_ != file)
		return;

	vcam_->unbind();

	owner_ = nullptr;
}
generated by cgit v1.2.1 (git 2.18.0) at 2025-05-24 18:24:44 +0000