3 * Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * 2006 Edgard Lima <edgard.lima@indt.org.br>
6 * v4l2src.c - system calls
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
29 #include <sys/types.h>
32 #include <sys/ioctl.h>
36 #include "v4l2src_calls.h"
40 #include "gstv4l2tuner.h"
42 GST_DEBUG_CATEGORY_EXTERN (v4l2src_debug);
43 #define GST_CAT_DEFAULT v4l2src_debug
46 #define GST_V4L2_SET_ACTIVE(element) (element)->buffer = GINT_TO_POINTER (-1)
47 #define GST_V4L2_SET_INACTIVE(element) (element)->buffer = NULL
49 #define DEBUG(format, args...) \
50 GST_CAT_DEBUG_OBJECT (\
51 v4l2src_debug, v4l2src, \
52 "V4L2SRC: " format, ##args)
54 /* On some systems MAP_FAILED seems to be missing */
56 #define MAP_FAILED ((caddr_t) -1)
59 /******************************************************
60 * gst_v4l2src_fill_format_list():
61 * create list of supported capture formats
62 * return value: TRUE on success, FALSE on error
63 ******************************************************/
65 gst_v4l2src_fill_format_list (GstV4l2Src * v4l2src)
68 struct v4l2_fmtdesc *format;
70 GST_DEBUG_OBJECT (v4l2src, "getting src format enumerations");
72 /* format enumeration */
74 format = g_new (struct v4l2_fmtdesc, 1);
77 format->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
78 if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
79 if (errno == EINVAL) {
80 break; /* end of enumeration */
84 GST_DEBUG_OBJECT (v4l2src, "got format %" GST_FOURCC_FORMAT,
85 GST_FOURCC_ARGS (format->pixelformat));
87 v4l2src->formats = g_slist_prepend (v4l2src->formats, format);
89 v4l2src->formats = g_slist_reverse (v4l2src->formats);
95 GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
96 (_("Failed to enumerate possible video formats device '%s' can work with"), v4l2src->v4l2object->videodev), ("Failed to get number %d in pixelformat enumeration for %s. (%d - %s)", n, v4l2src->v4l2object->videodev, errno, g_strerror (errno)));
102 /******************************************************
103 * gst_v4l2src_clear_format_list():
104 * free list of supported capture formats
105 * return value: TRUE on success, FALSE on error
106 ******************************************************/
108 gst_v4l2src_clear_format_list (GstV4l2Src * v4l2src)
110 g_slist_foreach (v4l2src->formats, (GFunc) g_free, NULL);
111 g_slist_free (v4l2src->formats);
112 v4l2src->formats = NULL;
117 static GstStructure *
118 gst_v4l2src_probe_caps_for_format_and_size (GstV4l2Src * v4l2src,
120 guint32 width, guint32 height, const GstStructure * template)
123 gint fd = v4l2src->v4l2object->video_fd;
124 struct v4l2_frmivalenum ival;
127 GValue rate = { 0, };
129 ret = gst_caps_new_empty ();
131 memset (&ival, 0, sizeof (struct v4l2_frmivalenum));
133 ival.pixel_format = pixelformat;
135 ival.height = height;
137 /* keep in mind that v4l2 gives us frame intervals (durations); we invert the
138 * fraction to get framerate */
140 if (ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0)
141 goto enum_frameintervals_failed;
143 if (ival.type == V4L2_FRMIVAL_TYPE_DISCRETE) {
144 GValue frac = { 0, };
146 g_value_init (&rate, GST_TYPE_LIST);
148 g_value_init (&frac, GST_TYPE_FRACTION);
151 num = ival.discrete.numerator;
152 denom = ival.discrete.denominator;
154 if (num > G_MAXINT || denom > G_MAXINT) {
155 /* let us hope we don't get here... */
160 gst_value_set_fraction (&frac, denom, num);
161 gst_value_list_append_value (&rate, &frac);
164 } while (ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
165 } else if (ival.type == V4L2_FRMIVAL_TYPE_STEPWISE) {
166 GValue frac = { 0, };
167 GValue step = { 0, };
170 g_value_init (&rate, GST_TYPE_LIST);
172 g_value_init (&frac, GST_TYPE_FRACTION);
173 g_value_init (&step, GST_TYPE_FRACTION);
174 g_value_init (&max, GST_TYPE_FRACTION);
176 num = ival.stepwise.min.numerator;
177 denom = ival.stepwise.min.denominator;
178 if (num > G_MAXINT || denom > G_MAXINT) {
182 gst_value_set_fraction (&frac, num, denom);
184 num = ival.stepwise.step.numerator;
185 denom = ival.stepwise.step.denominator;
186 if (num > G_MAXINT || denom > G_MAXINT) {
190 /* since we only have gst_value_fraction_subtract and not add, negate the
192 gst_value_set_fraction (&step, -num, denom);
194 num = ival.stepwise.max.numerator;
195 denom = ival.stepwise.max.denominator;
196 if (num > G_MAXINT || denom > G_MAXINT) {
200 gst_value_set_fraction (&max, num, denom);
202 while (gst_value_compare (&frac, &max) == GST_VALUE_LESS_THAN) {
203 GValue frac = { 0, };
204 g_value_init (&frac, GST_TYPE_FRACTION);
206 gst_value_set_fraction (&frac,
207 gst_value_get_fraction_denominator (&frac),
208 gst_value_get_fraction_numerator (&frac));
209 gst_value_list_append_value (&rate, &frac);
211 if (!gst_value_fraction_subtract (&frac, &frac, &step)) {
212 GST_INFO_OBJECT (v4l2src, "could not step fraction!");
216 } else if (ival.type == V4L2_FRMIVAL_TYPE_CONTINUOUS) {
217 guint32 maxnum, maxdenom;
219 g_value_init (&rate, GST_TYPE_FRACTION_RANGE);
221 num = ival.stepwise.min.numerator;
222 denom = ival.stepwise.min.denominator;
223 if (num > G_MAXINT || denom > G_MAXINT) {
228 maxnum = ival.stepwise.step.numerator;
229 maxdenom = ival.stepwise.step.denominator;
230 if (maxnum > G_MAXINT || maxdenom > G_MAXINT) {
235 gst_value_set_fraction_range_full (&rate, maxdenom, maxnum, denom, num);
240 s = gst_structure_copy (template);
241 gst_structure_set (s, "width", G_TYPE_INT, (gint) width,
242 "height", G_TYPE_INT, (gint) height, NULL);
243 gst_structure_set_value (s, "framerate", &rate);
244 g_value_unset (&rate);
247 enum_frameintervals_failed:
249 GST_DEBUG_OBJECT (v4l2src,
250 "Failed to enumerate frame sizes for %" GST_FOURCC_FORMAT "@%ux%u",
251 GST_FOURCC_ARGS (pixelformat), width, height);
256 /* I don't see how this is actually an error */
257 GST_WARNING_OBJECT (v4l2src,
258 "Unknown frame interval type at %" GST_FOURCC_FORMAT "@%ux%u: %u",
259 GST_FOURCC_ARGS (pixelformat), width, height, ival.type);
265 gst_v4l2src_probe_caps_for_format (GstV4l2Src * v4l2src, guint32 pixelformat,
266 const GstStructure * template)
270 gint fd = v4l2src->v4l2object->video_fd;
271 struct v4l2_frmsizeenum size;
274 ret = gst_caps_new_empty ();
276 memset (&size, 0, sizeof (struct v4l2_frmsizeenum));
278 size.pixel_format = pixelformat;
280 if (ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0)
281 goto enum_framesizes_failed;
283 if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
285 w = MIN (size.discrete.width, G_MAXINT);
286 h = MIN (size.discrete.height, G_MAXINT);
288 tmp = gst_v4l2src_probe_caps_for_format_and_size (v4l2src, pixelformat,
291 gst_caps_append_structure (ret, tmp);
294 } while (ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0);
295 } else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) {
296 for (w = size.stepwise.min_width, h = size.stepwise.min_height;
297 w < size.stepwise.max_width && h < size.stepwise.max_height;
298 w += size.stepwise.step_width, h += size.stepwise.step_height) {
299 if (w == 0 || h == 0)
302 tmp = gst_v4l2src_probe_caps_for_format_and_size (v4l2src, pixelformat,
305 gst_caps_append_structure (ret, tmp);
307 } else if (size.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) {
310 w = MAX (size.stepwise.min_width, 1);
311 h = MAX (size.stepwise.min_height, 1);
312 maxw = MIN (size.stepwise.max_width, G_MAXINT);
313 maxh = MIN (size.stepwise.max_height, G_MAXINT);
315 tmp = gst_v4l2src_probe_caps_for_format_and_size (v4l2src, pixelformat,
318 gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, (gint) w,
319 (gint) maxw, "height", GST_TYPE_INT_RANGE, (gint) h, (gint) maxh,
321 gst_caps_append_structure (ret, tmp);
330 enum_framesizes_failed:
332 /* I don't see how this is actually an error */
333 GST_DEBUG_OBJECT (v4l2src,
334 "Failed to enumerate frame sizes for pixelformat %" GST_FOURCC_FORMAT
335 " (%s)", GST_FOURCC_ARGS (pixelformat), g_strerror (errno));
340 GST_WARNING_OBJECT (v4l2src,
341 "Unknown frame sizeenum type for pixelformat %" GST_FOURCC_FORMAT
342 ": %u", GST_FOURCC_ARGS (pixelformat), size.type);
347 /******************************************************
348 * gst_v4l2src_queue_frame():
349 * queue a frame for capturing
350 * return value: TRUE on success, FALSE on error
351 ******************************************************/
353 gst_v4l2src_queue_frame (GstV4l2Src * v4l2src, guint i)
355 GST_LOG_OBJECT (v4l2src, "queueing frame %u", i);
357 if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_QBUF,
358 &v4l2src->pool->buffers[i].buffer) < 0)
366 GST_ELEMENT_ERROR (v4l2src, RESOURCE, WRITE,
367 (_("Could not exchange data with device '%s'."),
368 v4l2src->v4l2object->videodev),
369 ("Error queueing buffer %u on device %s. system error: %s", i,
370 v4l2src->v4l2object->videodev, g_strerror (errno)));
375 /******************************************************
376 * gst_v4l2src_grab_frame ():
377 * grab a frame for capturing
378 * return value: The captured frame number or -1 on error.
379 ******************************************************/
381 gst_v4l2src_grab_frame (GstV4l2Src * v4l2src)
383 #define NUM_TRIALS 50
384 struct v4l2_buffer buffer;
385 gint32 trials = NUM_TRIALS;
387 memset (&buffer, 0x00, sizeof (buffer));
388 buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
389 buffer.memory = V4L2_MEMORY_MMAP;
390 while (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF, &buffer) < 0) {
392 GST_LOG_OBJECT (v4l2src,
393 "problem grabbing frame %d (ix=%d), trials=%d, pool-ct=%d, buf.flags=%d",
394 buffer.sequence, buffer.index, trials, v4l2src->pool->refcount,
397 /* if the sync() got interrupted, we can retry */
400 GST_WARNING_OBJECT (v4l2src,
401 "Non-blocking I/O has been selected using O_NONBLOCK and"
402 " no buffer was in the outgoing queue. device %s",
403 v4l2src->v4l2object->videodev);
410 GST_INFO_OBJECT (v4l2src,
411 "VIDIOC_DQBUF failed due to an internal error."
412 " Can also indicate temporary problems like signal loss."
413 " Note the driver might dequeue an (empty) buffer despite"
414 " returning an error, or even stop capturing."
415 " device %s", v4l2src->v4l2object->videodev);
416 /* have we de-queued a buffer ? */
417 if (!(buffer.flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))) {
419 if ((buffer.index >= 0) && (buffer.index < v4l2src->breq.count)) {
420 GST_DEBUG_OBJECT (v4l2src, "reenqueing buffer (ix=%ld)", buffer.index);
421 gst_v4l2src_queue_frame (v4l2src, buffer.index);
425 GST_DEBUG_OBJECT (v4l2src, "reenqueing buffer");
426 if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_QBUF, &buffer) < 0) {
433 GST_WARNING_OBJECT (v4l2src,
434 "could not sync on a buffer on device %s",
435 v4l2src->v4l2object->videodev);
438 GST_WARNING_OBJECT (v4l2src,
439 "Grabbing frame got interrupted on %s. No expected reason.",
440 v4l2src->v4l2object->videodev);
444 /* check nr. of attempts to capture */
445 if (--trials == -1) {
446 goto too_many_trials;
448 memset (&buffer, 0x00, sizeof (buffer));
449 buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
450 buffer.memory = V4L2_MEMORY_MMAP;
454 GST_LOG_OBJECT (v4l2src, "grabbed frame %d (ix=%d), pool-ct=%d",
455 buffer.sequence, buffer.index, v4l2src->pool->refcount);
462 GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
463 (_("Failed trying to get video frames from device '%s'."),
464 v4l2src->v4l2object->videodev),
465 (_("The buffer type is not supported, or the index is out of bounds,"
466 " or no buffers have been allocated yet, or the userptr"
467 " or length are invalid. device %s"),
468 v4l2src->v4l2object->videodev));
473 GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
474 (_("Failed trying to get video frames from device '%s'. Not enough memory."), v4l2src->v4l2object->videodev), (_("insufficient memory to enqueue a user pointer buffer. device %s."), v4l2src->v4l2object->videodev));
479 GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
480 (_("Failed trying to get video frames from device '%s'."),
481 v4l2src->v4l2object->videodev),
482 (_("Failed after %d tries. device %s. system error: %s"),
483 NUM_TRIALS, v4l2src->v4l2object->videodev, g_strerror (errno)));
488 GST_ELEMENT_ERROR (v4l2src, RESOURCE, WRITE,
489 (_("Could not exchange data with device '%s'."),
490 v4l2src->v4l2object->videodev),
491 ("Error queueing buffer on device %s. system error: %s",
492 v4l2src->v4l2object->videodev, g_strerror (errno)));
498 /******************************************************
499 * gst_v4l2src_set_capture():
500 * set capture parameters
501 * return value: TRUE on success, FALSE on error
502 ******************************************************/
504 gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
505 guint32 width, guint32 height, guint fps_n, guint fps_d)
507 gint fd = v4l2src->v4l2object->video_fd;
508 struct v4l2_format format;
509 struct v4l2_streamparm stream;
511 DEBUG ("Setting capture format to %dx%d, format %" GST_FOURCC_FORMAT,
512 width, height, GST_FOURCC_ARGS (pixelformat));
514 GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
515 GST_V4L2_CHECK_NOT_ACTIVE (v4l2src->v4l2object);
517 memset (&format, 0x00, sizeof (struct v4l2_format));
518 format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
520 if (ioctl (fd, VIDIOC_G_FMT, &format) < 0)
523 format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
524 format.fmt.pix.width = width;
525 format.fmt.pix.height = height;
526 format.fmt.pix.pixelformat = pixelformat;
527 /* request whole frames; change when gstreamer supports interlaced video */
528 format.fmt.pix.field = V4L2_FIELD_INTERLACED;
530 if (ioctl (fd, VIDIOC_S_FMT, &format) < 0)
533 if (format.fmt.pix.width != width || format.fmt.pix.height != height)
534 goto invalid_dimensions;
536 if (format.fmt.pix.pixelformat != pixelformat)
537 goto invalid_pixelformat;
539 memset (&stream, 0x00, sizeof (struct v4l2_streamparm));
540 stream.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
541 if (ioctl (fd, VIDIOC_G_PARM, &stream) < 0)
542 goto get_parm_failed;
544 /* Note: V4L2 gives us the frame interval, we need the frame rate */
545 stream.parm.capture.timeperframe.numerator = fps_d;
546 stream.parm.capture.timeperframe.denominator = fps_n;
548 if (ioctl (fd, VIDIOC_S_PARM, &stream) < 0)
549 goto set_parm_failed;
552 /* FIXME: better test for fraction equality */
553 if (stream.parm.capture.timeperframe.numerator != fps_d
554 || stream.parm.capture.timeperframe.denominator != fps_n)
555 goto invalid_framerate;
562 GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
563 (_("Device '%s' does not support video capture"),
564 v4l2src->v4l2object->videodev),
565 ("Call to G_FMT failed: (%s)", g_strerror (errno)));
570 GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
571 (_("Device '%s' cannot capture at %dx%d"),
572 v4l2src->v4l2object->videodev, width, height),
573 ("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s",
574 GST_FOURCC_ARGS (pixelformat), width, height, g_strerror (errno)));
579 GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
580 (_("Device '%s' cannot capture at %dx%d"),
581 v4l2src->v4l2object->videodev, width, height),
582 ("Tried to capture at %dx%d, but device returned size %dx%d",
583 width, height, format.fmt.pix.width, format.fmt.pix.height));
588 GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
589 (_("Device '%s' cannot capture in the specified format"),
590 v4l2src->v4l2object->videodev),
591 ("Tried to capture in %" GST_FOURCC_FORMAT
592 ", but device returned format" " %" GST_FOURCC_FORMAT,
593 GST_FOURCC_ARGS (pixelformat),
594 GST_FOURCC_ARGS (format.fmt.pix.pixelformat)));
599 GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
600 (_("Could not get parameters on device '%s'"),
601 v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
606 GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
607 (_("Could not set parameters on device '%s'"),
608 v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
613 GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
614 (_("Device '%s' cannot capture at %d/%d frames per second"),
615 v4l2src->v4l2object->videodev, fps_n, fps_d),
616 ("Tried to capture at %d/%d fps, but device returned %d/%d fps",
617 fps_n, fps_d, stream.parm.capture.timeperframe.denominator,
618 stream.parm.capture.timeperframe.numerator));
623 /******************************************************
624 * gst_v4l2src_capture_init():
625 * initialize the capture system
626 * return value: TRUE on success, FALSE on error
627 ******************************************************/
629 gst_v4l2src_capture_init (GstV4l2Src * v4l2src)
632 GstV4l2Buffer *buffer;
633 gint fd = v4l2src->v4l2object->video_fd;
634 struct v4l2_requestbuffers breq;
636 memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
638 GST_DEBUG_OBJECT (v4l2src, "initializing the capture system");
640 GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
641 GST_V4L2_CHECK_NOT_ACTIVE (v4l2src->v4l2object);
643 if (v4l2src->v4l2object->vcap.capabilities & V4L2_CAP_STREAMING) {
644 breq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
645 breq.count = v4l2src->num_buffers;
647 breq.memory = V4L2_MEMORY_MMAP;
648 if (ioctl (fd, VIDIOC_REQBUFS, &breq) < 0)
651 if (breq.count < GST_V4L2_MIN_BUFFERS)
654 if (v4l2src->num_buffers != breq.count) {
655 v4l2src->num_buffers = breq.count;
656 g_object_notify (G_OBJECT (v4l2src), "queue-size");
659 GST_INFO_OBJECT (v4l2src, "Got %d buffers of size %d kB",
660 breq.count, v4l2src->frame_byte_size / 1024);
662 /* Map the buffers */
663 GST_LOG_OBJECT (v4l2src, "initiating buffer pool");
665 v4l2src->pool = g_new (GstV4l2BufferPool, 1);
666 gst_atomic_int_set (&v4l2src->pool->refcount, 1);
667 v4l2src->pool->video_fd = fd;
668 v4l2src->pool->buffer_count = v4l2src->num_buffers;
669 v4l2src->pool->buffers = g_new0 (GstV4l2Buffer, v4l2src->num_buffers);
671 for (n = 0; n < v4l2src->num_buffers; n++) {
672 buffer = &v4l2src->pool->buffers[n];
674 gst_atomic_int_set (&buffer->refcount, 1);
675 buffer->pool = v4l2src->pool;
676 memset (&buffer->buffer, 0x00, sizeof (buffer->buffer));
677 buffer->buffer.index = n;
678 buffer->buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
679 buffer->buffer.memory = V4L2_MEMORY_MMAP;
681 if (ioctl (fd, VIDIOC_QUERYBUF, &buffer->buffer) < 0)
682 goto querybuf_failed;
684 buffer->start = mmap (0, buffer->buffer.length, PROT_READ | PROT_WRITE,
685 MAP_SHARED, fd, buffer->buffer.m.offset);
687 if (buffer->start == MAP_FAILED)
690 buffer->length = buffer->buffer.length;
691 if (!gst_v4l2src_queue_frame (v4l2src, n))
695 GST_INFO_OBJECT (v4l2src, "capturing buffers via mmap()");
696 v4l2src->use_mmap = TRUE;
697 } else if (v4l2src->v4l2object->vcap.capabilities & V4L2_CAP_READWRITE) {
698 GST_INFO_OBJECT (v4l2src, "capturing buffers via read()");
699 v4l2src->use_mmap = FALSE;
700 v4l2src->pool = NULL;
702 goto no_supported_capture_method;
705 GST_V4L2_SET_ACTIVE (v4l2src->v4l2object);
712 GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
713 (_("Could not get buffers from device '%s'."),
714 v4l2src->v4l2object->videodev),
715 ("error requesting %d buffers: %s",
716 v4l2src->num_buffers, g_strerror (errno)));
721 GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
722 (_("Could not get enough buffers from device '%s'."),
723 v4l2src->v4l2object->videodev),
724 ("we received %d from device '%s', we want at least %d",
725 breq.count, v4l2src->v4l2object->videodev, GST_V4L2_MIN_BUFFERS));
730 GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
731 (_("Could not retrieve buffer from device '%s'"),
732 v4l2src->v4l2object->videodev),
733 ("Failed QUERYBUF: %s", g_strerror (errno)));
734 gst_v4l2src_capture_deinit (v4l2src);
739 GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
740 (_("Could not map memory in device '%s'."),
741 v4l2src->v4l2object->videodev),
742 ("mmap failed: %s", g_strerror (errno)));
743 gst_v4l2src_capture_deinit (v4l2src);
744 /* CHECKME: buffer->start = 0; */
749 GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
750 (_("Could not enqueue buffers in device '%s'."),
751 v4l2src->v4l2object->videodev),
752 ("enqueing buffer %d/%d failed: %s",
753 n, v4l2src->num_buffers, g_strerror (errno)));
754 gst_v4l2src_capture_deinit (v4l2src);
757 no_supported_capture_method:
759 GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
760 (_("The driver of device '%s' does not support any known capture "
761 "method."), v4l2src->v4l2object->videodev), (NULL));
767 /******************************************************
768 * gst_v4l2src_capture_start():
769 * start streaming capture
770 * return value: TRUE on success, FALSE on error
771 ******************************************************/
773 gst_v4l2src_capture_start (GstV4l2Src * v4l2src)
775 gint type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
777 GST_DEBUG_OBJECT (v4l2src, "starting the capturing");
778 //GST_V4L2_CHECK_OPEN (v4l2src->v4l2object);
779 GST_V4L2_CHECK_ACTIVE (v4l2src->v4l2object);
781 v4l2src->quit = FALSE;
783 if (v4l2src->use_mmap) {
784 if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_STREAMON, &type) < 0)
785 goto streamon_failed;
788 v4l2src->is_capturing = TRUE;
795 GST_ELEMENT_ERROR (v4l2src, RESOURCE, OPEN_READ,
796 (_("Error starting streaming capture from device '%s'."),
797 v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
802 /******************************************************
803 * gst_v4l2src_capture_stop():
804 * stop streaming capture
805 * return value: TRUE on success, FALSE on error
806 ******************************************************/
808 gst_v4l2src_capture_stop (GstV4l2Src * v4l2src)
810 gint type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
812 GST_DEBUG_OBJECT (v4l2src, "stopping capturing");
814 if (!GST_V4L2_IS_OPEN (v4l2src->v4l2object)) {
817 if (!GST_V4L2_IS_ACTIVE (v4l2src->v4l2object)) {
821 if (v4l2src->use_mmap) {
822 /* we actually need to sync on all queued buffers but not
823 * on the non-queued ones */
824 if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_STREAMOFF, &type) < 0)
825 goto streamoff_failed;
830 /* make an optional pending wait stop */
831 v4l2src->quit = TRUE;
832 v4l2src->is_capturing = FALSE;
839 GST_ELEMENT_ERROR (v4l2src, RESOURCE, CLOSE,
840 (_("Error stopping streaming capture from device '%s'."),
841 v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
847 gst_v4l2src_buffer_pool_free (GstV4l2BufferPool * pool, gboolean do_close)
851 for (i = 0; i < pool->buffer_count; i++) {
852 gst_atomic_int_set (&pool->buffers[i].refcount, 0);
853 munmap (pool->buffers[i].start, pool->buffers[i].length);
855 g_free (pool->buffers);
856 gst_atomic_int_set (&pool->refcount, 0);
858 close (pool->video_fd);
862 /******************************************************
863 * gst_v4l2src_capture_deinit():
864 * deinitialize the capture system
865 * return value: TRUE on success, FALSE on error
866 ******************************************************/
868 gst_v4l2src_capture_deinit (GstV4l2Src * v4l2src)
871 gboolean try_reinit = FALSE;
873 GST_DEBUG_OBJECT (v4l2src, "deinitting capture system");
875 if (!GST_V4L2_IS_OPEN (v4l2src->v4l2object)) {
878 if (!GST_V4L2_IS_ACTIVE (v4l2src->v4l2object)) {
883 /* free the buffers */
884 for (i = 0; i < v4l2src->num_buffers; i++) {
885 if (g_atomic_int_dec_and_test (&v4l2src->pool->buffers[i].refcount)) {
886 if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF,
887 &v4l2src->pool->buffers[i].buffer) < 0) {
888 GST_DEBUG_OBJECT (v4l2src,
889 "Could not dequeue buffer on uninitialization."
890 "system error: %s. Will try reinit instead", g_strerror (errno));
895 if (g_atomic_int_dec_and_test (&v4l2src->pool->refcount)) {
896 /* we're last thing that used all this */
897 gst_v4l2src_buffer_pool_free (v4l2src->pool, FALSE);
899 v4l2src->pool = NULL;
900 /* This is our second try to get the buffers dequeued.
901 * Since buffers are normally dequeued automatically when capturing is
902 * stopped, but may be enqueued before capturing has started, you get
903 * a problem when you abort before capturing started but have enqueued
904 * the buffers. We avoid that by starting/stopping capturing once so
905 * they get auto-dequeued.
908 gst_v4l2src_capture_start (v4l2src);
909 if (!gst_v4l2src_capture_stop (v4l2src)) {
910 /* stop throws an element-error on failure */
911 GST_WARNING_OBJECT (v4l2src, "failed reinit device");
917 GST_V4L2_SET_INACTIVE (v4l2src->v4l2object);
925 gst_v4l2src_get_size_limits (GstV4l2Src * v4l2src,
926 struct v4l2_fmtdesc * format,
927 gint * min_w, gint * max_w, gint * min_h, gint * max_h)
930 struct v4l2_format fmt;
932 GST_LOG_OBJECT (v4l2src,
933 "getting size limits with format %" GST_FOURCC_FORMAT,
934 GST_FOURCC_ARGS (format->pixelformat));
936 /* get size delimiters */
937 memset (&fmt, 0, sizeof (fmt));
938 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
939 fmt.fmt.pix.width = 0;
940 fmt.fmt.pix.height = 0;
941 fmt.fmt.pix.pixelformat = format->pixelformat;
942 fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
943 if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_TRY_FMT, &fmt) < 0) {
944 GST_DEBUG_OBJECT (v4l2src, "failed to get min size: %s",
950 *min_w = fmt.fmt.pix.width;
952 *min_h = fmt.fmt.pix.height;
954 GST_LOG_OBJECT (v4l2src,
955 "got min size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height);
957 fmt.fmt.pix.width = GST_V4L2_MAX_SIZE;
958 fmt.fmt.pix.height = GST_V4L2_MAX_SIZE;
959 if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_TRY_FMT, &fmt) < 0) {
960 GST_DEBUG_OBJECT (v4l2src, "failed to get max size: %s",
966 *max_w = fmt.fmt.pix.width;
968 *max_h = fmt.fmt.pix.height;
970 GST_LOG_OBJECT (v4l2src,
971 "got max size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height);
976 #define GST_TYPE_V4L2SRC_BUFFER (gst_v4l2src_buffer_get_type())
977 #define GST_IS_V4L2SRC_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_V4L2SRC_BUFFER))
978 #define GST_V4L2SRC_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4L2SRC_BUFFER, GstV4l2SrcBuffer))
980 typedef struct _GstV4l2SrcBuffer
987 static void gst_v4l2src_buffer_class_init (gpointer g_class,
988 gpointer class_data);
989 static void gst_v4l2src_buffer_init (GTypeInstance * instance,
991 static void gst_v4l2src_buffer_finalize (GstV4l2SrcBuffer * v4l2src_buffer);
994 gst_v4l2src_buffer_get_type (void)
996 static GType _gst_v4l2src_buffer_type;
998 if (G_UNLIKELY (_gst_v4l2src_buffer_type == 0)) {
999 static const GTypeInfo v4l2src_buffer_info = {
1000 sizeof (GstBufferClass),
1003 gst_v4l2src_buffer_class_init,
1006 sizeof (GstV4l2SrcBuffer),
1008 gst_v4l2src_buffer_init,
1011 _gst_v4l2src_buffer_type = g_type_register_static (GST_TYPE_BUFFER,
1012 "GstV4l2SrcBuffer", &v4l2src_buffer_info, 0);
1014 return _gst_v4l2src_buffer_type;
1018 gst_v4l2src_buffer_class_init (gpointer g_class, gpointer class_data)
1020 GstMiniObjectClass *mini_object_class = GST_MINI_OBJECT_CLASS (g_class);
1022 mini_object_class->finalize = (GstMiniObjectFinalizeFunction)
1023 gst_v4l2src_buffer_finalize;
1027 gst_v4l2src_buffer_init (GTypeInstance * instance, gpointer g_class)
1033 gst_v4l2src_buffer_finalize (GstV4l2SrcBuffer * v4l2src_buffer)
1035 GstV4l2Buffer *buf = v4l2src_buffer->buf;
1038 GST_LOG ("freeing buffer %p (nr. %d)", buf, buf->buffer.index);
1040 if (!g_atomic_int_dec_and_test (&buf->refcount)) {
1041 /* we're still in use, add to queue again
1042 * note: this might fail because the device is already stopped (race)
1044 if (ioctl (buf->pool->video_fd, VIDIOC_QBUF, &buf->buffer) < 0)
1045 GST_INFO ("readding to queue failed, assuming video device is stopped");
1047 if (g_atomic_int_dec_and_test (&buf->pool->refcount)) {
1048 /* we're last thing that used all this */
1049 gst_v4l2src_buffer_pool_free (buf->pool, TRUE);
1054 /* Create a V4l2Src buffer from our mmap'd data area */
1056 gst_v4l2src_buffer_new (GstV4l2Src * v4l2src, guint size, guint8 * data,
1057 GstV4l2Buffer * srcbuf)
1060 GstClockTime timestamp;
1064 buf = gst_buffer_new_and_alloc (size);
1066 buf = (GstBuffer *) gst_mini_object_new (GST_TYPE_V4L2SRC_BUFFER);
1067 GST_BUFFER_DATA (buf) = data;
1068 GST_V4L2SRC_BUFFER (buf)->buf = srcbuf;
1069 GST_LOG_OBJECT (v4l2src,
1070 "creating buffer %p (nr. %d)", srcbuf, srcbuf->buffer.index);
1072 GST_BUFFER_SIZE (buf) = size;
1074 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_READONLY);
1076 /* timestamps, LOCK to get clock and base time. */
1077 GST_OBJECT_LOCK (v4l2src);
1078 if ((clock = GST_ELEMENT_CLOCK (v4l2src))) {
1079 /* we have a clock, get base time and ref clock */
1080 timestamp = GST_ELEMENT (v4l2src)->base_time;
1081 gst_object_ref (clock);
1083 /* no clock, can't set timestamps */
1084 timestamp = GST_CLOCK_TIME_NONE;
1086 GST_OBJECT_UNLOCK (v4l2src);
1089 /* the time now is the time of the clock minus the base time */
1090 timestamp = gst_clock_get_time (clock) - timestamp;
1091 gst_object_unref (clock);
1094 /* FIXME: use the timestamp from the buffer itself! */
1095 GST_BUFFER_TIMESTAMP (buf) = timestamp;
1098 GST_BUFFER_OFFSET (buf) = v4l2src->offset++;
1099 GST_BUFFER_OFFSET_END (buf) = v4l2src->offset;
1101 /* the negotiate() method already set caps on the source pad */
1102 gst_buffer_set_caps (buf, GST_PAD_CAPS (GST_BASE_SRC_PAD (v4l2src)));