Lines Matching full:video
3 * uvc_video.c -- USB Video Class Gadget driver
14 #include <linux/usb/video.h>
23 * Video codecs
27 uvc_video_encode_header(struct uvc_video *video, struct uvc_buffer *buf, in uvc_video_encode_header() argument
31 data[1] = UVC_STREAM_EOH | video->fid; in uvc_video_encode_header()
33 if (buf->bytesused - video->queue.buf_used <= len - 2) in uvc_video_encode_header()
40 uvc_video_encode_data(struct uvc_video *video, struct uvc_buffer *buf, in uvc_video_encode_data() argument
43 struct uvc_video_queue *queue = &video->queue; in uvc_video_encode_data()
47 /* Copy video data to the USB buffer. */ in uvc_video_encode_data()
58 uvc_video_encode_bulk(struct usb_request *req, struct uvc_video *video, in uvc_video_encode_bulk() argument
62 int len = video->req_size; in uvc_video_encode_bulk()
66 if (video->payload_size == 0) { in uvc_video_encode_bulk()
67 ret = uvc_video_encode_header(video, buf, mem, len); in uvc_video_encode_bulk()
68 video->payload_size += ret; in uvc_video_encode_bulk()
73 /* Process video data. */ in uvc_video_encode_bulk()
74 len = min((int)(video->max_payload_size - video->payload_size), len); in uvc_video_encode_bulk()
75 ret = uvc_video_encode_data(video, buf, mem, len); in uvc_video_encode_bulk()
77 video->payload_size += ret; in uvc_video_encode_bulk()
80 req->length = video->req_size - len; in uvc_video_encode_bulk()
81 req->zero = video->payload_size == video->max_payload_size; in uvc_video_encode_bulk()
83 if (buf->bytesused == video->queue.buf_used) { in uvc_video_encode_bulk()
84 video->queue.buf_used = 0; in uvc_video_encode_bulk()
86 uvcg_queue_next_buffer(&video->queue, buf); in uvc_video_encode_bulk()
87 video->fid ^= UVC_STREAM_FID; in uvc_video_encode_bulk()
89 video->payload_size = 0; in uvc_video_encode_bulk()
92 if (video->payload_size == video->max_payload_size || in uvc_video_encode_bulk()
93 buf->bytesused == video->queue.buf_used) in uvc_video_encode_bulk()
94 video->payload_size = 0; in uvc_video_encode_bulk()
98 uvc_video_encode_isoc(struct usb_request *req, struct uvc_video *video, in uvc_video_encode_isoc() argument
102 int len = video->req_size; in uvc_video_encode_isoc()
106 ret = uvc_video_encode_header(video, buf, mem, len); in uvc_video_encode_isoc()
110 /* Process video data. */ in uvc_video_encode_isoc()
111 ret = uvc_video_encode_data(video, buf, mem, len); in uvc_video_encode_isoc()
114 req->length = video->req_size - len; in uvc_video_encode_isoc()
116 if (buf->bytesused == video->queue.buf_used) { in uvc_video_encode_isoc()
117 video->queue.buf_used = 0; in uvc_video_encode_isoc()
119 uvcg_queue_next_buffer(&video->queue, buf); in uvc_video_encode_isoc()
120 video->fid ^= UVC_STREAM_FID; in uvc_video_encode_isoc()
128 static int uvcg_video_ep_queue(struct uvc_video *video, struct usb_request *req) in uvcg_video_ep_queue() argument
132 ret = usb_ep_queue(video->ep, req, GFP_ATOMIC); in uvcg_video_ep_queue()
136 if (usb_endpoint_xfer_bulk(video->ep->desc)) in uvcg_video_ep_queue()
137 usb_ep_set_halt(video->ep); in uvcg_video_ep_queue()
148 * if a video buffer is available.
151 * the handler will start streaming if a video buffer is available and if
152 * video is not currently streaming.
154 * - V4L2 buffer queueing: the driver will start streaming if video is not
160 * The "video currently streaming" condition can't be detected by the irqqueue
171 * handler will restart the video stream.
176 struct uvc_video *video = req->context; in uvc_video_complete() local
177 struct uvc_video_queue *queue = &video->queue; in uvc_video_complete()
198 spin_lock_irqsave(&video->queue.irqlock, flags); in uvc_video_complete()
199 buf = uvcg_queue_head(&video->queue); in uvc_video_complete()
201 spin_unlock_irqrestore(&video->queue.irqlock, flags); in uvc_video_complete()
205 video->encode(req, video, buf); in uvc_video_complete()
207 ret = uvcg_video_ep_queue(video, req); in uvc_video_complete()
208 spin_unlock_irqrestore(&video->queue.irqlock, flags); in uvc_video_complete()
218 spin_lock_irqsave(&video->req_lock, flags); in uvc_video_complete()
219 list_add_tail(&req->list, &video->req_free); in uvc_video_complete()
220 spin_unlock_irqrestore(&video->req_lock, flags); in uvc_video_complete()
224 uvc_video_free_requests(struct uvc_video *video) in uvc_video_free_requests() argument
229 if (video->req[i]) { in uvc_video_free_requests()
230 usb_ep_free_request(video->ep, video->req[i]); in uvc_video_free_requests()
231 video->req[i] = NULL; in uvc_video_free_requests()
234 if (video->req_buffer[i]) { in uvc_video_free_requests()
235 kfree(video->req_buffer[i]); in uvc_video_free_requests()
236 video->req_buffer[i] = NULL; in uvc_video_free_requests()
240 INIT_LIST_HEAD(&video->req_free); in uvc_video_free_requests()
241 video->req_size = 0; in uvc_video_free_requests()
246 uvc_video_alloc_requests(struct uvc_video *video) in uvc_video_alloc_requests() argument
252 BUG_ON(video->req_size); in uvc_video_alloc_requests()
254 req_size = video->ep->maxpacket in uvc_video_alloc_requests()
255 * max_t(unsigned int, video->ep->maxburst, 1) in uvc_video_alloc_requests()
256 * (video->ep->mult); in uvc_video_alloc_requests()
259 video->req_buffer[i] = kmalloc(req_size, GFP_KERNEL); in uvc_video_alloc_requests()
260 if (video->req_buffer[i] == NULL) in uvc_video_alloc_requests()
263 video->req[i] = usb_ep_alloc_request(video->ep, GFP_KERNEL); in uvc_video_alloc_requests()
264 if (video->req[i] == NULL) in uvc_video_alloc_requests()
267 video->req[i]->buf = video->req_buffer[i]; in uvc_video_alloc_requests()
268 video->req[i]->length = 0; in uvc_video_alloc_requests()
269 video->req[i]->complete = uvc_video_complete; in uvc_video_alloc_requests()
270 video->req[i]->context = video; in uvc_video_alloc_requests()
272 list_add_tail(&video->req[i]->list, &video->req_free); in uvc_video_alloc_requests()
275 video->req_size = req_size; in uvc_video_alloc_requests()
280 uvc_video_free_requests(video); in uvc_video_alloc_requests()
285 * Video streaming
289 * uvcg_video_pump - Pump video data into the USB requests
292 * video data from the queued buffers.
294 int uvcg_video_pump(struct uvc_video *video) in uvcg_video_pump() argument
296 struct uvc_video_queue *queue = &video->queue; in uvcg_video_pump()
310 spin_lock_irqsave(&video->req_lock, flags); in uvcg_video_pump()
311 if (list_empty(&video->req_free)) { in uvcg_video_pump()
312 spin_unlock_irqrestore(&video->req_lock, flags); in uvcg_video_pump()
315 req = list_first_entry(&video->req_free, struct usb_request, in uvcg_video_pump()
318 spin_unlock_irqrestore(&video->req_lock, flags); in uvcg_video_pump()
320 /* Retrieve the first available video buffer and fill the in uvcg_video_pump()
321 * request, protected by the video queue irqlock. in uvcg_video_pump()
330 video->encode(req, video, buf); in uvcg_video_pump()
333 ret = uvcg_video_ep_queue(video, req); in uvcg_video_pump()
342 spin_lock_irqsave(&video->req_lock, flags); in uvcg_video_pump()
343 list_add_tail(&req->list, &video->req_free); in uvcg_video_pump()
344 spin_unlock_irqrestore(&video->req_lock, flags); in uvcg_video_pump()
349 * Enable or disable the video stream.
351 int uvcg_video_enable(struct uvc_video *video, int enable) in uvcg_video_enable() argument
356 if (video->ep == NULL) { in uvcg_video_enable()
357 printk(KERN_INFO "Video enable failed, device is " in uvcg_video_enable()
364 if (video->req[i]) in uvcg_video_enable()
365 usb_ep_dequeue(video->ep, video->req[i]); in uvcg_video_enable()
367 uvc_video_free_requests(video); in uvcg_video_enable()
368 uvcg_queue_enable(&video->queue, 0); in uvcg_video_enable()
372 if ((ret = uvcg_queue_enable(&video->queue, 1)) < 0) in uvcg_video_enable()
375 if ((ret = uvc_video_alloc_requests(video)) < 0) in uvcg_video_enable()
378 if (video->max_payload_size) { in uvcg_video_enable()
379 video->encode = uvc_video_encode_bulk; in uvcg_video_enable()
380 video->payload_size = 0; in uvcg_video_enable()
382 video->encode = uvc_video_encode_isoc; in uvcg_video_enable()
384 return uvcg_video_pump(video); in uvcg_video_enable()
388 * Initialize the UVC video stream.
390 int uvcg_video_init(struct uvc_video *video) in uvcg_video_init() argument
392 INIT_LIST_HEAD(&video->req_free); in uvcg_video_init()
393 spin_lock_init(&video->req_lock); in uvcg_video_init()
395 video->fcc = V4L2_PIX_FMT_YUYV; in uvcg_video_init()
396 video->bpp = 16; in uvcg_video_init()
397 video->width = 320; in uvcg_video_init()
398 video->height = 240; in uvcg_video_init()
399 video->imagesize = 320 * 240 * 2; in uvcg_video_init()
401 /* Initialize the video buffers queue. */ in uvcg_video_init()
402 uvcg_queue_init(&video->queue, V4L2_BUF_TYPE_VIDEO_OUTPUT, in uvcg_video_init()
403 &video->mutex); in uvcg_video_init()