3 * gstv4lmjpegsrc.c: hardware MJPEG video source plugin
5 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
28 #include "v4lmjpegsrc_calls.h"
30 GST_DEBUG_CATEGORY (v4lmjpegsrc_debug);
31 #define GST_CAT_DEFAULT v4lmjpegsrc_debug
33 /* elementfactory information */
34 static GstElementDetails gst_v4lmjpegsrc_details =
35 GST_ELEMENT_DETAILS ("Video (video4linux/MJPEG) Source",
37 "Reads MJPEG-encoded frames from a zoran MJPEG/video4linux device",
38 "Ronald Bultje <rbultje@ronald.bitfreak.net>");
40 /* V4lMjpegSrc signals and args */
59 /* normally, we would want to use subframe capture, however,
60 * for the time being it's easier if we disable it first */
68 GST_FORMATS_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_formats,
69 GST_FORMAT_TIME, GST_FORMAT_DEFAULT);
70 GST_QUERY_TYPE_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_query_types,
74 static void gst_v4lmjpegsrc_base_init (gpointer g_class);
75 static void gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass);
76 static void gst_v4lmjpegsrc_init (GstV4lMjpegSrc * v4lmjpegsrc);
78 /* pad/info functions */
79 static gboolean gst_v4lmjpegsrc_src_convert (GstPad * pad,
81 gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
82 static gboolean gst_v4lmjpegsrc_src_query (GstPad * pad,
83 GstQueryType type, GstFormat * format, gint64 * value);
85 /* buffer functions */
86 static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad * pad,
87 const GstCaps * caps);
88 static GstData *gst_v4lmjpegsrc_get (GstPad * pad);
89 static GstCaps *gst_v4lmjpegsrc_getcaps (GstPad * pad);
92 static void gst_v4lmjpegsrc_set_property (GObject * object,
93 guint prop_id, const GValue * value, GParamSpec * pspec);
94 static void gst_v4lmjpegsrc_get_property (GObject * object,
95 guint prop_id, GValue * value, GParamSpec * pspec);
97 /* set_clock function for A/V sync */
98 static void gst_v4lmjpegsrc_set_clock (GstElement * element, GstClock * clock);
101 static GstStateChangeReturn gst_v4lmjpegsrc_change_state (GstElement * element);
103 /* requeue buffer after use */
104 static void gst_v4lmjpegsrc_buffer_free (GstBuffer * buffer);
106 static GstElementClass *parent_class = NULL;
107 static guint gst_v4lmjpegsrc_signals[LAST_SIGNAL] = { 0 };
111 gst_v4lmjpegsrc_get_type (void)
113 static GType v4lmjpegsrc_type = 0;
115 if (!v4lmjpegsrc_type) {
116 static const GTypeInfo v4lmjpegsrc_info = {
117 sizeof (GstV4lMjpegSrcClass),
118 gst_v4lmjpegsrc_base_init,
120 (GClassInitFunc) gst_v4lmjpegsrc_class_init,
123 sizeof (GstV4lMjpegSrc),
125 (GInstanceInitFunc) gst_v4lmjpegsrc_init,
130 g_type_register_static (GST_TYPE_V4LELEMENT, "GstV4lMjpegSrc",
131 &v4lmjpegsrc_info, 0);
133 return v4lmjpegsrc_type;
138 gst_v4lmjpegsrc_base_init (gpointer g_class)
140 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
143 GST_STATIC_CAPS ("image/jpeg, "
144 "width = (int) [ 0, MAX ], "
145 "height = (int) [ 0, MAX ], " "framerate = (fraction) [ 0, MAX ]")
147 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
149 gst_element_class_set_details (gstelement_class, &gst_v4lmjpegsrc_details);
151 gst_element_class_add_pad_template (gstelement_class,
152 gst_static_pad_template_get (&src_template));
155 gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass)
157 GObjectClass *gobject_class;
158 GstElementClass *gstelement_class;
160 gobject_class = (GObjectClass *) klass;
161 gstelement_class = (GstElementClass *) klass;
163 parent_class = g_type_class_peek_parent (klass);
166 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_X_OFFSET,
167 g_param_spec_int ("x_offset", "x_offset", "x_offset",
168 G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE));
169 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_Y_OFFSET,
170 g_param_spec_int ("y_offset", "y_offset", "y_offset",
171 G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE));
172 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_F_WIDTH,
173 g_param_spec_int ("frame_width", "frame_width", "frame_width",
174 G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE));
175 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_F_HEIGHT,
176 g_param_spec_int ("frame_height", "frame_height", "frame_height",
177 G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE));
180 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QUALITY,
181 g_param_spec_int ("quality", "Quality", "JPEG frame quality",
182 1, 100, 50, G_PARAM_READWRITE));
184 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NUMBUFS,
185 g_param_spec_int ("num_buffers", "Num Buffers", "Number of Buffers",
186 1, 256, 64, G_PARAM_READWRITE));
187 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFSIZE,
188 g_param_spec_int ("buffer_size", "Buffer Size", "Size of buffers",
189 0, 512 * 1024, 128 * 1024, G_PARAM_READABLE));
191 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_USE_FIXED_FPS,
192 g_param_spec_boolean ("use_fixed_fps", "Use Fixed FPS",
193 "Drop/Insert frames to reach a certain FPS (TRUE) "
194 "or adapt FPS to suit the number of grabbed frames",
195 TRUE, G_PARAM_READWRITE));
198 gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE] =
199 g_signal_new ("frame-capture", G_TYPE_FROM_CLASS (klass),
200 G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_capture),
201 NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
202 gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP] =
203 g_signal_new ("frame-drop", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
204 G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_drop), NULL, NULL,
205 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
206 gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT] =
207 g_signal_new ("frame-insert", G_TYPE_FROM_CLASS (klass),
208 G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_insert),
209 NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
210 gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST] =
211 g_signal_new ("frame-lost", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
212 G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_lost), NULL, NULL,
213 g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
215 GST_DEBUG_CATEGORY_INIT (v4lmjpegsrc_debug, "v4lmjpegsrc", 0,
216 "V4L MJPEG source element");
217 gobject_class->set_property = gst_v4lmjpegsrc_set_property;
218 gobject_class->get_property = gst_v4lmjpegsrc_get_property;
220 gstelement_class->change_state = gst_v4lmjpegsrc_change_state;
222 gstelement_class->set_clock = gst_v4lmjpegsrc_set_clock;
227 gst_v4lmjpegsrc_init (GstV4lMjpegSrc * v4lmjpegsrc)
229 GstElementClass *klass = GST_ELEMENT_GET_CLASS (v4lmjpegsrc);
231 GST_OBJECT_FLAG_SET (GST_ELEMENT (v4lmjpegsrc), GST_ELEMENT_THREAD_SUGGESTED);
233 v4lmjpegsrc->srcpad =
234 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
236 gst_element_add_pad (GST_ELEMENT (v4lmjpegsrc), v4lmjpegsrc->srcpad);
238 gst_pad_set_get_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get);
239 gst_pad_set_getcaps_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_getcaps);
240 gst_pad_set_link_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_srcconnect);
241 gst_pad_set_convert_function (v4lmjpegsrc->srcpad,
242 gst_v4lmjpegsrc_src_convert);
243 gst_pad_set_formats_function (v4lmjpegsrc->srcpad,
244 gst_v4lmjpegsrc_get_formats);
245 gst_pad_set_query_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_src_query);
246 gst_pad_set_query_type_function (v4lmjpegsrc->srcpad,
247 gst_v4lmjpegsrc_get_query_types);
250 v4lmjpegsrc->frame_width = 0;
251 v4lmjpegsrc->frame_height = 0;
252 v4lmjpegsrc->x_offset = -1;
253 v4lmjpegsrc->y_offset = -1;
256 v4lmjpegsrc->quality = 50;
258 v4lmjpegsrc->numbufs = 64;
261 v4lmjpegsrc->clock = NULL;
264 v4lmjpegsrc->use_fixed_fps = TRUE;
266 v4lmjpegsrc->is_capturing = FALSE;
271 gst_v4lmjpegsrc_get_fps (GstV4lMjpegSrc * v4lmjpegsrc, GValue * fps)
275 g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (fps), FALSE);
277 if (!v4lmjpegsrc->use_fixed_fps &&
278 v4lmjpegsrc->clock != NULL && v4lmjpegsrc->handled > 0) {
279 /* try to get time from clock master and calculate fps */
281 gst_clock_get_time (v4lmjpegsrc->clock) - v4lmjpegsrc->substract_time;
282 return v4lmjpegsrc->handled * GST_SECOND / time;
285 /* if that failed ... */
287 if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc)))
290 if (!gst_v4l_get_chan_norm (GST_V4LELEMENT (v4lmjpegsrc), NULL, &norm))
293 if (norm == VIDEO_MODE_NTSC)
294 gst_value_set_fraction (fps, 30000, 1001);
296 gst_value_set_fraction (fps, 25, 1);
302 gst_v4lmjpegsrc_src_convert (GstPad * pad,
303 GstFormat src_format,
304 gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
306 GstV4lMjpegSrc *v4lmjpegsrc;
308 gboolean result = TRUE;
310 v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
312 g_value_init (&fps, GST_VALUE_FRACTION);
313 if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps))
316 switch (src_format) {
317 case GST_FORMAT_TIME:
318 switch (*dest_format) {
319 case GST_FORMAT_DEFAULT:
320 *dest_value = gst_util_uint64_scale (src_value,
321 gst_value_get_fraction_numerator (&fps),
322 gst_value_get_fraction_denominator (&fps) * GST_SECOND);
329 case GST_FORMAT_DEFAULT:
330 switch (*dest_format) {
331 case GST_FORMAT_TIME:
332 *dest_value = src_value * gst_util_uint64_scale_int (GST_SECOND,
333 gst_value_get_fraction_denominator (&fps),
334 gst_value_get_fraction_numerator (&fps));
345 g_value_unset (&fps);
350 gst_v4lmjpegsrc_src_query (GstPad * pad,
351 GstQueryType type, GstFormat * format, gint64 * value)
353 GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
357 g_value_init (&fps, GST_VALUE_FRACTION);
358 if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps))
362 case GST_QUERY_POSITION:
364 case GST_FORMAT_TIME:
365 *value = v4lmjpegsrc->handled * gst_util_uint64_scale_int (GST_SECOND,
366 gst_value_get_fraction_denominator (&fps),
367 gst_value_get_fraction_numerator (&fps));
369 case GST_FORMAT_DEFAULT:
370 *value = v4lmjpegsrc->handled;
382 g_value_unset (&fps);
387 calc_bufsize (int hor_dec, int ver_dec)
389 guint8 div = hor_dec * ver_dec;
390 guint32 num = (1024 * 512) / (div);
399 if (result > (512 * 1024))
406 static GstPadLinkReturn
407 gst_v4lmjpegsrc_srcconnect (GstPad * pad, const GstCaps * caps)
409 GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
410 gint hor_dec, ver_dec;
412 gint max_w = GST_V4LELEMENT (v4lmjpegsrc)->vcap.maxwidth,
413 max_h = GST_V4LELEMENT (v4lmjpegsrc)->vcap.maxheight;
415 GstStructure *structure;
416 gboolean was_capturing;
418 /* in case the buffers are active (which means that we already
419 * did capsnego before and didn't clean up), clean up anyways */
420 if ((was_capturing = v4lmjpegsrc->is_capturing)) {
421 if (!gst_v4lmjpegsrc_capture_stop (v4lmjpegsrc))
422 return GST_PAD_LINK_REFUSED;
424 if (GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) {
425 if (!gst_v4lmjpegsrc_capture_deinit (v4lmjpegsrc))
426 return GST_PAD_LINK_REFUSED;
427 } else if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) {
428 return GST_PAD_LINK_DELAYED;
431 /* Note: basically, we don't give a damn about the opposite caps here.
432 * that might seem odd, but it isn't. we know that the opposite caps is
433 * either NULL or has mime type image/jpeg, and in both cases, we'll set
434 * our own mime type back and it'll work. Other properties are to be set
435 * by the src, not by the opposite caps */
437 structure = gst_caps_get_structure (caps, 0);
438 gst_structure_get_int (structure, "width", &w);
439 gst_structure_get_int (structure, "height", &h);
441 /* figure out decimation */
444 } else if (w * 2 >= max_w) {
451 } else if (h * 2 >= max_h) {
457 /* calculate bufsize */
458 bufsize = calc_bufsize (hor_dec, ver_dec);
460 /* set buffer info */
461 if (!gst_v4lmjpegsrc_set_buffer (v4lmjpegsrc, v4lmjpegsrc->numbufs, bufsize)) {
462 return GST_PAD_LINK_REFUSED;
465 /* set capture parameters and mmap the buffers */
466 if (hor_dec == ver_dec) {
467 if (!gst_v4lmjpegsrc_set_capture (v4lmjpegsrc,
468 hor_dec, v4lmjpegsrc->quality)) {
469 return GST_PAD_LINK_REFUSED;
472 if (!gst_v4lmjpegsrc_set_capture_m (v4lmjpegsrc,
473 0, 0, max_w, max_h, hor_dec, ver_dec, v4lmjpegsrc->quality)) {
474 return GST_PAD_LINK_REFUSED;
478 if (!v4lmjpegsrc->frame_width && !v4lmjpegsrc->frame_height &&
479 v4lmjpegsrc->x_offset < 0 && v4lmjpegsrc->y_offset < 0 &&
480 v4lmjpegsrc->horizontal_decimation == v4lmjpegsrc->vertical_decimation) {
481 if (!gst_v4lmjpegsrc_set_capture (v4lmjpegsrc,
482 v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->quality))
483 return GST_PAD_LINK_REFUSED;
485 if (!gst_v4lmjpegsrc_set_capture_m (v4lmjpegsrc,
486 v4lmjpegsrc->x_offset, v4lmjpegsrc->y_offset,
487 v4lmjpegsrc->frame_width, v4lmjpegsrc->frame_height,
488 v4lmjpegsrc->horizontal_decimation,
489 v4lmjpegsrc->vertical_decimation, v4lmjpegsrc->quality))
490 return GST_PAD_LINK_REFUSED;
494 if (!gst_v4lmjpegsrc_capture_init (v4lmjpegsrc))
495 return GST_PAD_LINK_REFUSED;
497 if (was_capturing || GST_STATE (v4lmjpegsrc) == GST_STATE_PLAYING)
498 if (!gst_v4lmjpegsrc_capture_start (v4lmjpegsrc))
499 return GST_PAD_LINK_REFUSED;
501 return GST_PAD_LINK_OK;
506 gst_v4lmjpegsrc_get (GstPad * pad)
508 GstV4lMjpegSrc *v4lmjpegsrc;
512 GstClockTime duration;
513 GstClockTime cur_frame_time;
515 g_return_val_if_fail (pad != NULL, NULL);
517 v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
519 if (v4lmjpegsrc->use_fixed_fps) {
520 g_value_init (&fps, GST_VALUE_FRACTION);
521 duration = gst_util_uint64_scale_int (GST_SECOND,
522 gst_value_get_fraction_denominator (&fps),
523 gst_value_get_fraction_numerator (&fps));
525 gst_util_uint64_scale_int (v4lmjpegsrc->handled * GST_SECOND,
526 gst_value_get_fraction_denominator (&fps),
527 gst_value_get_fraction_numerator (&fps));
530 if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps)) {
531 g_value_unset (&fps);
536 if (v4lmjpegsrc->need_writes > 0) {
538 num = v4lmjpegsrc->last_frame;
539 v4lmjpegsrc->need_writes--;
540 } else if (v4lmjpegsrc->clock && v4lmjpegsrc->use_fixed_fps) {
542 gboolean have_frame = FALSE;
545 /* by default, we use the frame once */
546 v4lmjpegsrc->need_writes = 1;
548 /* grab a frame from the device */
549 if (!gst_v4lmjpegsrc_grab_frame (v4lmjpegsrc, &num,
550 &v4lmjpegsrc->last_size))
553 v4lmjpegsrc->last_frame = num;
554 time = GST_TIMEVAL_TO_TIME (v4lmjpegsrc->bsync.timestamp) -
555 v4lmjpegsrc->substract_time;
557 /* first check whether we lost any frames according to the device */
558 if (v4lmjpegsrc->last_seq != 0) {
559 if (v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq > 1) {
560 v4lmjpegsrc->need_writes =
561 v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq;
562 g_signal_emit (G_OBJECT (v4lmjpegsrc),
563 gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST], 0,
564 v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq - 1);
567 v4lmjpegsrc->last_seq = v4lmjpegsrc->bsync.seq;
569 /* decide how often we're going to write the frame - set
570 * v4lmjpegsrc->need_writes to (that-1) and have_frame to TRUE
571 * if we're going to write it - else, just continue.
573 * time is generally the system or audio clock. Let's
574 * say that we've written one second of audio, then we want
575 * to have written one second of video too, within the same
576 * timeframe. This means that if time - begin_time = X sec,
577 * we want to have written X*fps frames. If we've written
578 * more - drop, if we've written less - dup... */
579 if (cur_frame_time - time > 1.5 * duration) {
580 /* yo dude, we've got too many frames here! Drop! DROP! */
581 v4lmjpegsrc->need_writes--; /* -= (v4lmjpegsrc->handled - (time / fps)); */
582 g_signal_emit (G_OBJECT (v4lmjpegsrc),
583 gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP], 0);
584 } else if (cur_frame_time - time < -1.5 * duration) {
585 /* this means we're lagging far behind */
586 v4lmjpegsrc->need_writes++; /* += ((time / fps) - v4lmjpegsrc->handled); */
587 g_signal_emit (G_OBJECT (v4lmjpegsrc),
588 gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT], 0);
591 if (v4lmjpegsrc->need_writes > 0) {
593 v4lmjpegsrc->use_num_times[num] = v4lmjpegsrc->need_writes;
594 v4lmjpegsrc->need_writes--;
596 gst_v4lmjpegsrc_requeue_frame (v4lmjpegsrc, num);
598 } while (!have_frame);
600 /* grab a frame from the device */
601 if (!gst_v4lmjpegsrc_grab_frame (v4lmjpegsrc, &num,
602 &v4lmjpegsrc->last_size))
605 v4lmjpegsrc->use_num_times[num] = 1;
608 buf = gst_buffer_new ();
609 GST_BUFFER_FREE_DATA_FUNC (buf) = gst_v4lmjpegsrc_buffer_free;
610 GST_BUFFER_PRIVATE (buf) = v4lmjpegsrc;
611 GST_BUFFER_DATA (buf) = gst_v4lmjpegsrc_get_buffer (v4lmjpegsrc, num);
612 GST_BUFFER_SIZE (buf) = v4lmjpegsrc->last_size;
613 GST_BUFFER_MAXSIZE (buf) = v4lmjpegsrc->breq.size;
614 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY);
615 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_DONTFREE);
616 if (v4lmjpegsrc->use_fixed_fps)
617 GST_BUFFER_TIMESTAMP (buf) = cur_frame_time;
618 else /* calculate time based on our own clock */
619 GST_BUFFER_TIMESTAMP (buf) =
620 GST_TIMEVAL_TO_TIME (v4lmjpegsrc->bsync.timestamp) -
621 v4lmjpegsrc->substract_time;
623 v4lmjpegsrc->handled++;
624 g_signal_emit (G_OBJECT (v4lmjpegsrc),
625 gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE], 0);
627 return GST_DATA (buf);
632 gst_v4lmjpegsrc_getcaps (GstPad * pad)
634 GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad));
635 struct video_capability *vcap = &GST_V4LELEMENT (v4lmjpegsrc)->vcap;
639 GValue w = { 0 }, h = {
645 if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) {
646 return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
649 g_value_init (&fps, GST_TYPE_FRACTION);
650 gst_return_val_if_fail (gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps), NULL);
652 caps = gst_caps_new_simple ("image/jpeg", NULL);
653 str = gst_caps_get_structure (caps, 0);
654 gst_structure_set_value (str, "framerate", &fps);
655 g_value_unset (&fps);
657 g_value_init (&w, GST_TYPE_LIST);
658 g_value_init (&h, GST_TYPE_LIST);
659 g_value_init (&w1, G_TYPE_INT);
660 g_value_init (&h1, G_TYPE_INT);
661 for (i = 0; i <= 2; i++) {
662 g_value_set_int (&w1, vcap->maxwidth / (1 << i));
663 g_value_set_int (&h1, vcap->maxheight / (1 << i));
664 gst_value_list_append_value (&w, &w1);
665 gst_value_list_append_value (&h, &h1);
669 gst_structure_set_value (str, "width", &w);
670 gst_structure_set_value (str, "height", &h);
679 gst_v4lmjpegsrc_set_property (GObject * object,
680 guint prop_id, const GValue * value, GParamSpec * pspec)
682 GstV4lMjpegSrc *v4lmjpegsrc;
684 g_return_if_fail (GST_IS_V4LMJPEGSRC (object));
685 v4lmjpegsrc = GST_V4LMJPEGSRC (object);
690 v4lmjpegsrc->x_offset = g_value_get_int (value);
693 v4lmjpegsrc->y_offset = g_value_get_int (value);
696 v4lmjpegsrc->frame_width = g_value_get_int (value);
699 v4lmjpegsrc->frame_height = g_value_get_int (value);
703 v4lmjpegsrc->quality = g_value_get_int (value);
706 v4lmjpegsrc->numbufs = g_value_get_int (value);
708 case ARG_USE_FIXED_FPS:
709 if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) {
710 v4lmjpegsrc->use_fixed_fps = g_value_get_boolean (value);
714 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
721 gst_v4lmjpegsrc_get_property (GObject * object,
722 guint prop_id, GValue * value, GParamSpec * pspec)
724 GstV4lMjpegSrc *v4lmjpegsrc;
726 g_return_if_fail (GST_IS_V4LMJPEGSRC (object));
727 v4lmjpegsrc = GST_V4LMJPEGSRC (object);
732 g_value_set_int (value, v4lmjpegsrc->x_offset);
735 g_value_set_int (value, v4lmjpegsrc->y_offset);
738 g_value_set_int (value, v4lmjpegsrc->frame_width);
741 g_value_set_int (value, v4lmjpegsrc->frame_height);
745 g_value_set_int (value, v4lmjpegsrc->quality);
748 if (GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc)))
749 g_value_set_int (value, v4lmjpegsrc->breq.count);
751 g_value_set_int (value, v4lmjpegsrc->numbufs);
754 g_value_set_int (value, v4lmjpegsrc->breq.size);
756 case ARG_USE_FIXED_FPS:
757 g_value_set_boolean (value, v4lmjpegsrc->use_fixed_fps);
760 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
766 static GstStateChangeReturn
767 gst_v4lmjpegsrc_change_state (GstElement * element, GstStateChange transition)
769 GstV4lMjpegSrc *v4lmjpegsrc;
772 g_return_val_if_fail (GST_IS_V4LMJPEGSRC (element), GST_STATE_CHANGE_FAILURE);
774 v4lmjpegsrc = GST_V4LMJPEGSRC (element);
776 switch (transition) {
777 case GST_STATE_CHANGE_READY_TO_PAUSED:
778 /* actual buffer set-up used to be done here - but I moved
779 * it to capsnego itself */
780 v4lmjpegsrc->handled = 0;
781 v4lmjpegsrc->need_writes = 0;
782 v4lmjpegsrc->last_frame = 0;
783 v4lmjpegsrc->substract_time = 0;
785 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
786 /* queue all buffer, start streaming capture */
787 if (GST_V4LELEMENT (v4lmjpegsrc)->buffer &&
788 !gst_v4lmjpegsrc_capture_start (v4lmjpegsrc))
789 return GST_STATE_CHANGE_FAILURE;
790 g_get_current_time (&time);
791 v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME (time) -
792 v4lmjpegsrc->substract_time;
793 v4lmjpegsrc->last_seq = 0;
795 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
796 g_get_current_time (&time);
797 v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME (time) -
798 v4lmjpegsrc->substract_time;
799 /* de-queue all queued buffers */
800 if (v4lmjpegsrc->is_capturing &&
801 !gst_v4lmjpegsrc_capture_stop (v4lmjpegsrc))
802 return GST_STATE_CHANGE_FAILURE;
804 case GST_STATE_CHANGE_PAUSED_TO_READY:
805 /* stop capturing, unmap all buffers */
806 if (GST_V4LELEMENT (v4lmjpegsrc)->buffer &&
807 !gst_v4lmjpegsrc_capture_deinit (v4lmjpegsrc))
808 return GST_STATE_CHANGE_FAILURE;
812 if (GST_ELEMENT_CLASS (parent_class)->change_state)
813 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
815 return GST_STATE_CHANGE_SUCCESS;
820 gst_v4lmjpegsrc_set_clock (GstElement * element, GstClock * clock)
822 GST_V4LMJPEGSRC (element)->clock = clock;
828 gst_v4lmjpegsrc_buffer_new (GstBufferPool * pool,
829 guint64 offset, guint size, gpointer user_data)
832 GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (user_data);
834 if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc)))
837 buffer = gst_buffer_new ();
841 /* TODO: add interlacing info to buffer as metadata */
842 GST_BUFFER_MAXSIZE (buffer) = v4lmjpegsrc->breq.size;
843 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_DONTFREE);
850 gst_v4lmjpegsrc_buffer_free (GstBuffer * buf)
852 GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (GST_BUFFER_PRIVATE (buf));
855 if (gst_element_get_state (GST_ELEMENT (v4lmjpegsrc)) != GST_STATE_PLAYING)
856 return; /* we've already cleaned up ourselves */
858 for (n = 0; n < v4lmjpegsrc->breq.count; n++)
859 if (GST_BUFFER_DATA (buf) == gst_v4lmjpegsrc_get_buffer (v4lmjpegsrc, n)) {
860 v4lmjpegsrc->use_num_times[n]--;
861 if (v4lmjpegsrc->use_num_times[n] <= 0) {
862 gst_v4lmjpegsrc_requeue_frame (v4lmjpegsrc, n);
867 if (n == v4lmjpegsrc->breq.count)
868 GST_ELEMENT_ERROR (v4lmjpegsrc, RESOURCE, TOO_LAZY, (NULL),
869 ("Couldn't find the buffer"));