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/Linux-v6.1/Documentation/userspace-api/media/v4l/
Dmmap.rst18 Streaming is an I/O method where only pointers to buffers are exchanged
20 mapping is primarily intended to map buffers in device memory into the
24 drivers support streaming as well, allocating buffers in DMA-able main
27 A driver can support many sets of buffers. Each set is identified by a
32 To allocate device buffers applications call the
34 of buffers and buffer type, for example ``V4L2_BUF_TYPE_VIDEO_CAPTURE``.
35 This ioctl can also be used to change the number of buffers or to free
36 the allocated memory, provided none of the buffers are still mapped.
38 Before applications can access the buffers they must map them into their
40 location of the buffers in device memory can be determined with the
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Ddev-decoder.rst12 from the client to process these buffers.
50 the destination buffer queue; for decoders, the queue of buffers containing
51 decoded frames; for encoders, the queue of buffers containing an encoded
54 into ``CAPTURE`` buffers.
84 ``OUTPUT`` buffers must be queued by the client in decode order; for
85 encoders ``CAPTURE`` buffers must be returned by the encoder in decode order.
92 buffers must be queued by the client in display order; for decoders,
93 ``CAPTURE`` buffers must be returned by the decoder in display order.
117 the source buffer queue; for decoders, the queue of buffers containing
118 an encoded bytestream; for encoders, the queue of buffers containing raw
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Duserp.rst19 methods. Buffers (planes) are allocated by the application itself, and
26 No buffers (planes) are allocated beforehand, consequently they are not
27 indexed and cannot be queried like mapped buffers with the
51 :ref:`VIDIOC_QBUF <VIDIOC_QBUF>` ioctl. Although buffers are commonly
60 Filled or displayed buffers are dequeued with the
66 Applications must take care not to free buffers without dequeuing.
67 Firstly, the buffers remain locked for longer, wasting physical memory.
73 buffers, to start capturing and enter the read loop. Here the
76 and enqueue buffers, when enough buffers are stacked up output is
78 buffers it must wait until an empty buffer can be dequeued and reused.
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Dcapture.c.rst51 struct buffer *buffers;
91 if (-1 == read(fd, buffers[0].start, buffers[0].length)) {
106 process_image(buffers[0].start, buffers[0].length);
132 process_image(buffers[buf.index].start, buf.bytesused);
160 if (buf.m.userptr == (unsigned long)buffers[i].start
161 && buf.length == buffers[i].length)
268 buf.m.userptr = (unsigned long)buffers[i].start;
269 buf.length = buffers[i].length;
287 free(buffers[0].start);
292 if (-1 == munmap(buffers[i].start, buffers[i].length))
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Ddev-encoder.rst157 desired size of ``CAPTURE`` buffers; the encoder may adjust it to
169 adjusted size of ``CAPTURE`` buffers.
307 coded video. It does *not* set the rate at which buffers arrive on the
365 buffers to be aligned to 1920x1088 for codecs with 16x16 macroblock
375 7. Allocate buffers for both ``OUTPUT`` and ``CAPTURE`` via
381 requested number of buffers to allocate; greater than zero.
393 actual number of buffers allocated.
397 The actual number of allocated buffers may differ from the ``count``
403 To allocate more than the minimum number of OUTPUT buffers (for pipeline
405 control to get the minimum number of buffers required, and pass the
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Dvidioc-reqbufs.rst36 Memory mapped buffers are located in device memory and must be allocated
38 space. User buffers are allocated by applications themselves, and this
40 to setup some internal structures. Similarly, DMABUF buffers are
45 To allocate device buffers applications initialize all fields of the
48 the desired number of buffers, ``memory`` must be set to the requested
51 allocate the requested number of buffers and it stores the actual number
54 number is also possible when the driver requires more buffers to
56 buffers, one displayed and one filled by the application.
62 buffers. Note that if any buffers are still mapped or exported via DMABUF,
66 If ``V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS`` is set, then these buffers are
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Ddmabuf.rst10 The DMABUF framework provides a generic method for sharing buffers
19 exporting V4L2 buffers as DMABUF file descriptors.
25 importing DMA buffers through DMABUF file descriptors is supported is
29 This I/O method is dedicated to sharing DMA buffers between different
31 DRM). Buffers (planes) are allocated by a driver on behalf of an
32 application. Next, these buffers are exported to the application as file
63 buffers, every plane can be associated with a different DMABUF
64 descriptor. Although buffers are commonly cycled, applications can pass
121 Captured or displayed buffers are dequeued with the
129 buffers, to start capturing and enter the read loop. Here the
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Ddev-stateless-decoder.rst100 destination buffers parsed/decoded from the bytestream.
167 to obtain up-to-date information about the buffers size and layout.
169 6. Allocate source (bytestream) buffers via :c:func:`VIDIOC_REQBUFS` on
175 requested number of buffers to allocate; greater than zero.
186 actual number of buffers allocated.
189 minimum of required number of ``OUTPUT`` buffers for the given format and
191 to get the actual number of buffers allocated.
193 7. Allocate destination (raw format) buffers via :c:func:`VIDIOC_REQBUFS` on the
199 requested number of buffers to allocate; greater than zero. The client
200 is responsible for deducing the minimum number of buffers required
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Dvidioc-create-bufs.rst13 VIDIOC_CREATE_BUFS - Create buffers for Memory Mapped or User Pointer or DMA Buffer I/O
34 This ioctl is used to create buffers for :ref:`memory mapped <mmap>`
38 over buffers is required. This ioctl can be called multiple times to
39 create buffers of different sizes.
41 To allocate the device buffers applications must initialize the relevant
43 ``count`` field must be set to the number of requested buffers, the
47 The ``format`` field specifies the image format that the buffers must be
54 sizes (for multi-planar formats) will be used for the allocated buffers.
58 The buffers created by this ioctl will have as minimum size the size
68 will attempt to allocate up to the requested number of buffers and store
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Dvidioc-streamon.rst43 Capture hardware is disabled and no input buffers are filled (if there
44 are any empty buffers in the incoming queue) until ``VIDIOC_STREAMON``
51 If ``VIDIOC_STREAMON`` fails then any already queued buffers will remain
55 in progress, unlocks any user pointer buffers locked in physical memory,
56 and it removes all buffers from the incoming and outgoing queues. That
63 If buffers have been queued with :ref:`VIDIOC_QBUF` and
65 ``VIDIOC_STREAMON``, then those queued buffers will also be removed from
77 but ``VIDIOC_STREAMOFF`` will return queued buffers to their starting
95 The buffer ``type`` is not supported, or no buffers have been
/Linux-v6.1/drivers/media/test-drivers/vivid/
Dvivid-vid-common.c41 .buffers = 1,
50 .buffers = 1,
58 .buffers = 1,
66 .buffers = 1,
74 .buffers = 1,
82 .buffers = 1,
90 .buffers = 1,
98 .buffers = 1,
106 .buffers = 1,
114 .buffers = 1,
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/Linux-v6.1/lib/xz/
Dxz_dec_test.c42 * Input and output buffers. The input buffer is used as a temporary safe
49 * Structure to pass the input and output buffers to the XZ decoder.
52 static struct xz_buf buffers = { variable
75 buffers.in_pos = 0; in xz_dec_test_open()
76 buffers.in_size = 0; in xz_dec_test_open()
77 buffers.out_pos = 0; in xz_dec_test_open()
120 while ((remaining > 0 || buffers.out_pos == buffers.out_size) in xz_dec_test_write()
122 if (buffers.in_pos == buffers.in_size) { in xz_dec_test_write()
123 buffers.in_pos = 0; in xz_dec_test_write()
124 buffers.in_size = min(remaining, sizeof(buffer_in)); in xz_dec_test_write()
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/Linux-v6.1/drivers/media/pci/ivtv/
Divtv-queue.c35 q->buffers = 0; in ivtv_queue_init()
53 q->buffers++; in ivtv_enqueue()
68 q->buffers--; in ivtv_dequeue()
82 from->buffers--; in ivtv_queue_move_buf()
88 to->buffers++; in ivtv_queue_move_buf()
93 /* Move 'needed_bytes' worth of buffers from queue 'from' into queue 'to'.
94 If 'needed_bytes' == 0, then move all buffers from 'from' into 'to'.
95 If 'steal' != NULL, then buffers may also taken from that queue if
99 also cleared if buffers need to be taken from the 'steal' queue and
107 -ENOMEM is returned if the buffers could not be obtained, 0 if all
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/Linux-v6.1/Documentation/driver-api/media/
Dv4l2-videobuf.rst21 and user space. It handles the allocation and management of buffers for
34 Not all video devices use the same kind of buffers. In fact, there are (at
37 - Buffers which are scattered in both the physical and (kernel) virtual
38 address spaces. (Almost) all user-space buffers are like this, but it
39 makes great sense to allocate kernel-space buffers this way as well when
44 - Buffers which are physically scattered, but which are virtually
45 contiguous; buffers allocated with vmalloc(), in other words. These
46 buffers are just as hard to use for DMA operations, but they can be
48 buffers are convenient.
50 - Buffers which are physically contiguous. Allocation of this kind of
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/Linux-v6.1/Documentation/userspace-api/media/dvb/
Ddmx-reqbufs.rst38 Memory mapped buffers are located in device memory and must be allocated
40 space. User buffers are allocated by applications themselves, and this
42 to setup some internal structures. Similarly, DMABUF buffers are
47 To allocate device buffers applications initialize all fields of the
49 to the desired number of buffers, and ``size`` to the size of each
53 attempt to allocate the requested number of buffers and it stores the actual
55 number is also possible when the driver requires more buffers to
63 buffers, however this cannot succeed when any buffers are still mapped.
64 A ``count`` value of zero frees all buffers, after aborting or finishing
/Linux-v6.1/Documentation/filesystems/
Drelay.rst12 as a set of per-cpu kernel buffers ('channel buffers'), each
14 clients write into the channel buffers using efficient write
19 are associated with the channel buffers using the API described below.
21 The format of the data logged into the channel buffers is completely
36 sub-buffers. Messages are written to the first sub-buffer until it is
38 the next (if available). Messages are never split across sub-buffers.
60 read sub-buffers; thus in cases where read(2) is being used to drain
61 the channel buffers, special-purpose communication between kernel and
96 allowing both to convey the state of buffers (full, empty, amount of
98 consumes the read sub-buffers; thus in cases where read(2) is being
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/Linux-v6.1/Documentation/userspace-api/media/mediactl/
Drequest-api.rst21 on the media pipeline, reconfigure it for the next frame, queue the buffers to
28 specific buffers. This allows user-space to schedule several tasks ("requests")
59 instead of being immediately applied, and buffers queued to a request do not
65 Once the configuration and buffers of the request are specified, it can be
72 output buffers, not for capture buffers. Attempting to add a capture buffer
77 buffers are processed. Media controller drivers do a best effort implementation
82 It is not allowed to mix queuing requests with directly queuing buffers:
99 once all its associated buffers are available for dequeuing and all the
102 dequeue its buffers: buffers that are available halfway through a request can
135 to queue many such buffers in advance. It can also take advantage of requests'
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/Linux-v6.1/drivers/iio/buffer/
Dindustrialio-hw-consumer.c19 * @buffers: hardware buffers list head.
23 struct list_head buffers; member
57 list_for_each_entry(buf, &hwc->buffers, head) { in iio_hw_consumer_get_buffer()
72 list_add_tail(&buf->head, &hwc->buffers); in iio_hw_consumer_get_buffer()
94 INIT_LIST_HEAD(&hwc->buffers); in iio_hw_consumer_alloc()
116 list_for_each_entry(buf, &hwc->buffers, head) in iio_hw_consumer_alloc()
134 list_for_each_entry_safe(buf, n, &hwc->buffers, head) in iio_hw_consumer_free()
183 list_for_each_entry(buf, &hwc->buffers, head) { in iio_hw_consumer_enable()
192 list_for_each_entry_continue_reverse(buf, &hwc->buffers, head) in iio_hw_consumer_enable()
206 list_for_each_entry(buf, &hwc->buffers, head) in iio_hw_consumer_disable()
/Linux-v6.1/drivers/android/
Dbinder_alloc.h23 * @entry: entry alloc->buffers
40 * Bookkeeping structure for binder transaction buffers
82 * @buffers: list of all buffers for this proc
83 * @free_buffers: rb tree of buffers available for allocation
85 * @allocated_buffers: rb tree of allocated buffers sorted by address
86 * @free_async_space: VA space available for async buffers. This is
96 * buffers. It is normally initialized during binder_init() and binder_mmap()
97 * calls. The address space is used for both user-visible buffers and for
98 * struct binder_buffer objects used to track the user buffers
105 struct list_head buffers; member
Dbinder_alloc_selftest.c116 struct binder_buffer *buffers[], in binder_selftest_alloc_buf() argument
122 buffers[i] = binder_alloc_new_buf(alloc, sizes[i], 0, 0, 0, 0); in binder_selftest_alloc_buf()
123 if (IS_ERR(buffers[i]) || in binder_selftest_alloc_buf()
124 !check_buffer_pages_allocated(alloc, buffers[i], in binder_selftest_alloc_buf()
133 struct binder_buffer *buffers[], in binder_selftest_free_buf() argument
139 binder_alloc_free_buf(alloc, buffers[seq[i]]); in binder_selftest_free_buf()
179 struct binder_buffer *buffers[BUFFER_NUM]; in binder_selftest_alloc_free() local
181 binder_selftest_alloc_buf(alloc, buffers, sizes, seq); in binder_selftest_alloc_free()
182 binder_selftest_free_buf(alloc, buffers, sizes, seq, end); in binder_selftest_alloc_free()
185 binder_selftest_alloc_buf(alloc, buffers, sizes, seq); in binder_selftest_alloc_free()
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/Linux-v6.1/Documentation/admin-guide/media/
Dcafe_ccic.rst37 buffers until the time comes to transfer data. If this option is set,
38 then worst-case-sized buffers will be allocated at module load time.
42 - dma_buf_size: The size of DMA buffers to allocate. Note that this
43 option is only consulted for load-time allocation; when buffers are
48 buffers. Normally, the driver tries to use three buffers; on faster
51 - min_buffers: The minimum number of streaming I/O buffers that the driver
56 - max_buffers: The maximum number of streaming I/O buffers; default is
/Linux-v6.1/fs/
Dbuffer.c82 * Returns if the folio has dirty or writeback buffers. If all the buffers
84 * any of the buffers are locked, it is assumed they are locked for IO.
180 * But it's the page lock which protects the buffers. To get around this,
222 /* we might be here because some of the buffers on this page are in __find_get_block_slow()
225 * elsewhere, don't buffer_error if we had some unmapped buffers in __find_get_block_slow()
285 * If all of the buffers are uptodate then we can set the page in end_buffer_async_read()
385 * If a page's buffers are under async readin (end_buffer_async_read
387 * control could lock one of the buffers after it has completed
388 * but while some of the other buffers have not completed. This
393 * The page comes unlocked when it has no locked buffer_async buffers
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/Linux-v6.1/drivers/gpu/drm/xen/
Dxen_drm_front.h27 * DOC: Driver modes of operation in terms of display buffers used
31 * host and guest environments, display buffers can be allocated by either
36 * DOC: Buffers allocated by the frontend driver
38 * In this mode of operation driver allocates buffers from system memory.
43 * buffers from the frontend driver.
47 * DOC: Buffers allocated by the backend
53 * requirements for display buffers it is possible to allocate such buffers
94 /* display buffers */
/Linux-v6.1/drivers/media/platform/samsung/s5p-mfc/
Ds5p_mfc_common.h557 * @vq_src: vb2 queue for source buffers
558 * @vq_dst: vb2 queue for destination buffers
559 * @src_queue: driver internal queue for source buffers
560 * @dst_queue: driver internal queue for destination buffers
561 * @src_queue_cnt: number of buffers queued on the source internal queue
562 * @dst_queue_cnt: number of buffers queued on the dest internal queue
575 * @dpb_flush_flag: flag used to indicate that a DPB buffers are being
579 * @bank1: handle to memory allocated for temporary buffers from
581 * @bank2: handle to memory allocated for temporary buffers from
583 * @capture_state: state of the capture buffers queue
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/Linux-v6.1/drivers/media/pci/cx18/
Dcx18-queue.c242 /* Reset MDL id's and move all buffers back to the stream's buf_pool */ in cx18_unload_queues()
272 * Attach buffers to MDLs, give the MDLs ids, and add MDLs to q_free in cx18_load_queues()
274 * Excess buffers are left in buf_pool and/or on an MDL in q_idle in cx18_load_queues()
301 * case of a non-integral number of buffers to meet in cx18_load_queues()
313 /* Not enough buffers for this MDL; we won't use it */ in cx18_load_queues()
337 if (s->buffers == 0) in cx18_stream_alloc()
340 CX18_DEBUG_INFO("Allocate %s stream: %d x %d buffers (%d.%02d kB total)\n", in cx18_stream_alloc()
341 s->name, s->buffers, s->buf_size, in cx18_stream_alloc()
342 s->buffers * s->buf_size / 1024, in cx18_stream_alloc()
343 (s->buffers * s->buf_size * 100 / 1024) % 100); in cx18_stream_alloc()
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