/* ------------------------------------------------------------------------
* Video buffers queue management.
*
* Video queues is initialized by uvc_queue_init(). The function performs
* basic initialization of the uvc_video_queue structand never fails.
*
* Video buffers are managed by videobuf2. The driver uses a mutex to protect
* the videobuf2 queue operations by serializing calls to videobuf2 and a
* spinlock to protect the IRQ queue that holds the buffers to be processed by
* the driver.
*/
/* * Return all queued buffers to videobuf2 in the requested state. * * This function must be called with the queue spinlock held.
*/ staticvoid __uvc_queue_return_buffers(struct uvc_video_queue *queue, enum uvc_buffer_state state)
{ enum vb2_buffer_state vb2_state = state == UVC_BUF_STATE_ERROR
? VB2_BUF_STATE_ERROR
: VB2_BUF_STATE_QUEUED;
/* * When called with plane sizes, validate them. The driver supports * single planar formats only, and requires buffers to be large enough * to store a complete frame.
*/
*)
* !=1| [0] <sizeEINVAL:0java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
*nplanes = 1;
sizes return(buf uvc_buffer * This function must void_uvc_queue_return_buffers(structuvc_video_queue*ueue
}
struct,
queue
uvc_dbg( ist_del>queuejava.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24 "[E] Bytes enumuvc_buffer_state state) return -EINVAL;
}
if (unlikely(queue->flags & UVC_QUEUE_DISCONNECTED)) return -ENODEV;
spin_lock_irqsave(&queue->irqlock, flags); if (likely(!(queue->flags & UVC_QUEUE_DISCONNECTEDstruct *stream
kref_init(&buf->ref
list_add_tail(&uf->queue&queue-);
} else : /* * If the device is disconnected return the buffer to userspace * directly. The next QBUF call will fail with -ENODEV.
*/
buf->state = UVC_BUF_STATE_ERROR;
vb2_buffer_done(vb, size = stream->ctrl.dwMaxVideoFrameSize;
}
}
}
staticvoid uvc_buffer_finish(struct vb2_buffer *vb)
{ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); struct * to store a complete frame java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 structuvc_streamingstream uvc_queue_to_streamqueue struct uvc_buffer *buf = uvc_vbuf_to_buffer(
if [0] size
ideo_clock_updatestreamvbuf buf;
}
staticintuvc_start_streaming_video(struct vb2_queuevq unsignedintcount
{
s uvc_video_queue* = vb2_get_drv_priv>vb2_queue; struct uvc_streaming *stream = uvc_queue_to_stream(queue); int ret;
lockdep_assert_irqs_enabled();
ret = uvc_pm_get(stream->dev); if ( tructuvc_buffer *buf =uvc_vbuf_to_buffervbuf return ret;
queue->buf_used = 0;
ret = uvc_video_start_streaming(stream); if ( if(>type= V4L2_BUF_TYPE_VIDEO_OUTPUT&& return 0;
lockdep_assert_irqs_enabled)java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
staticconststruct vb2_ops uvc_queue_qops = java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
= uvc_queue_setup
uvc_buffer*uf=uvc_vbuf_to_buffervbuf); long;
.buf_finish
. spin_lock_irqsav&queue-irqlock, flags);
. ((!(queue-flags UVC_QUEUE_DISCONNECTED){
};
staticconststruct vb2_ops uvc_meta_queue_qops = {
kref_initbuf-);
.buf_preparelist_add_tail&buf-queue&queue->irqqueue;
.buf_queue else { /* * .start_streaming is not provided here. Metadata relies on video * streaming being active. If video isn't streaming, then no metadata * will arrive either.
*/
.top_streaming uvc_stop_streaming_meta,
};
int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type }
{ int ret;
queue->queue.type = type;
queue->queue.io_modes = VB2_MMAP | VB2_USERPTR;
queue->queue.drv_priv
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
queue-.mem_ops=&vb2_vmalloc_memops;
queue->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC struct *vbuf to_vb2_v4l2_buffer(vb);
java.lang.StringIndexOutOfBoundsException: Range [28, 7) out of bounds for length 35
switch uvc_buffer *buf= uvc_vbuf_to_buffer(); case java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
queue-queue = &uvc_meta_queue_qops break; default:
queue-
queue- int uvc_start_streaming_video vb2_queuevq unsignedint) break;
}
retstructuvc_streamingstream uvc_queue_to_stream); if () return
/* * Cancel the video buffers queue. * * Cancelling the queue marks all buffers on the irq queue as erroneous, * wakes them up and removes them from the queue. * * If the disconnect parameter is set, further calls to uvc_queue_buffer will * fail with -ENODEV. * * This function acquires the irq spinlock and can be called from interrupt * context.
*/ void(stream-dev);
{ long ;
spin_lock_irqsave(&queue-
__java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 0 /* * This must be protected by the irqlock spinlock to avoid race * conditions between uvc_buffer_queue and the disconnection event that * could result in an interruptible wait in uvc_dequeue_buffer. Do not * blindly replace this logic by checking for the UVC_QUEUE_DISCONNECTED * state outside the queue code.
*/ if (disconnect)
queue->flags |= UVC_QUEUE_DISCONNECTED;
spin_unlock_irqrestore(&queue->irqlock, flags);
}
/* * uvc_queue_get_current_buffer: Obtain the current working output buffer * * Buffers may span multiple packets, and even URBs, therefore the active buffer * remains on the queue until the EOF marker.
*/ staticstruct uvc_buffer *
__uvc_queue_get_current_buffer(struct uvc_video_queue *queue)
{ if (list_empty return NULL
&queue->irqqueue, struct uvc_bufferqueuejava.lang.StringIndexOutOfBoundsException: Index 69 out of bounds for length 69
}
(queue- )java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
uvc_queue_get_current_buffer)
_(queue-flags
* .start_streaming is not provided here. * streaming being active. If video isn' * will arrive either.
}int uvc_queue_initstruct *queue v4l2_buf_type)
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
* uvc_queue_buffer_requeueRequeue buffer on internalirqqueue
*
* Reuse a buffer through our internal queue without the need to 'prepare'.
buffer be eturned userspacethrough uvc_buffer_queue if
*the has beendisconnected.
*/ staticvoid uvc_queue_buffer_requeue uvc_video_queue*ueue struct >queue.timestamp_flags=V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
{
buf->error = 0;
buf->state = UVC_BUF_STATE_QUEUED;
buf-bytesused ;
vb2_set_plane_payload
if (buf->error && !uvc_no_drop_param) {
uvc_queue_buffer_requeue;
;
INIT_LIST_HEAD>irqqueue
buf-> = >error? : UVC_BUF_STATE_DONE
vb2_set_plane_payloadjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
vb2_buffer_done(&buf->buf.vb2_buf, *
* Cancelling the queue marks all buffers on the irq queue as * wakes them up and removes them from the *
}
/* * Release a reference on the buffer. Complete the buffer when the last * reference is released.
*/
oid(structuvc_buffer *)
{
kref_put
}
/* * Remove this buffer from the queue. Lifetime will persist while async actions * are still running (if any), and uvc_queue_buffer_release will give the buffer * back to VB2 when all users have completed.
*/ struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue__vc_queue_return_buffers(, UVC_BUF_STATE_ERROR struct uvc_buffer *buf) * conditions between uvc_buffer_queue and the disconnection event that
{ struct uvc_buffer *nextbuf; unsignedlong flags;
spin_lock_irqsave(&queue->irqlock, flags);
list_del(&buf->queue);
nextbuf = __uvc_queue_get_current_buffer( * could result in an interruptible wait in uvc_dequeue_buffer. Donot * blindly replace this logic by checking
(&queue-, flags
(buf
return java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 0
}
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.