2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 * <2005> Wim Taymans <wim@fluendo.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
28 #include <gst/audio/audio.h>
29 #include "gstdvdemux.h"
30 #include "gstsmptetimecode.h"
33 * SECTION:element-dvdemux
35 * dvdemux splits raw DV into its audio and video components. The audio will be
36 * decoded raw samples and the video will be encoded DV video.
38 * This element can operate in both push and pull mode depending on the
39 * capabilities of the upstream peer.
42 * <title>Example launch line</title>
44 * gst-launch filesrc location=test.dv ! dvdemux name=demux ! queue ! audioconvert ! alsasink demux. ! queue ! dvdec ! xvimagesink
45 * ]| This pipeline decodes and renders the raw DV stream to an audio and a videosink.
48 * Last reviewed on 2006-02-27 (0.10.3)
51 /* DV output has two modes, normal and wide. The resolution is the same in both
52 * cases: 720 pixels wide by 576 pixels tall in PAL format, and 720x480 for
55 * Each of the modes has its own pixel aspect ratio, which is fixed in practice
56 * by ITU-R BT.601 (also known as "CCIR-601" or "Rec.601"). Or so claims a
57 * reference that I culled from the reliable "internet",
58 * http://www.mir.com/DMG/aspect.html. Normal PAL is 59/54 and normal NTSC is
59 * 10/11. Because the pixel resolution is the same for both cases, we can get
60 * the pixel aspect ratio for wide recordings by multiplying by the ratio of
61 * display aspect ratios, 16/9 (for wide) divided by 4/3 (for normal):
63 * Wide NTSC: 10/11 * (16/9)/(4/3) = 40/33
64 * Wide PAL: 59/54 * (16/9)/(4/3) = 118/81
66 * However, the pixel resolution coming out of a DV source does not combine with
67 * the standard pixel aspect ratios to give a proper display aspect ratio. An
68 * image 480 pixels tall, with a 4:3 display aspect ratio, will be 768 pixels
69 * wide. But, if we take the normal PAL aspect ratio of 59/54, and multiply it
70 * with the width of the DV image (720 pixels), we get 786.666..., which is
71 * nonintegral and too wide. The camera is not outputting a 4:3 image.
73 * If the video sink for this stream has fixed dimensions (such as for
74 * fullscreen playback, or for a java applet in a web page), you then have two
75 * choices. Either you show the whole image, but pad the image with black
76 * borders on the top and bottom (like watching a widescreen video on a 4:3
77 * device), or you crop the video to the proper ratio. Apparently the latter is
78 * the standard practice.
80 * For its part, GStreamer is concerned with accuracy and preservation of
81 * information. This element outputs the 720x576 or 720x480 video that it
82 * recieves, noting the proper aspect ratio. This should not be a problem for
83 * windowed applications, which can change size to fit the video. Applications
84 * with fixed size requirements should decide whether to crop or pad which
85 * an element such as videobox can do.
88 #define NTSC_HEIGHT 480
89 #define NTSC_BUFFER 120000
90 #define NTSC_FRAMERATE_NUMERATOR 30000
91 #define NTSC_FRAMERATE_DENOMINATOR 1001
93 #define PAL_HEIGHT 576
94 #define PAL_BUFFER 144000
95 #define PAL_FRAMERATE_NUMERATOR 25
96 #define PAL_FRAMERATE_DENOMINATOR 1
98 #define PAL_NORMAL_PAR_X 59
99 #define PAL_NORMAL_PAR_Y 54
100 #define PAL_WIDE_PAR_X 118
101 #define PAL_WIDE_PAR_Y 81
103 #define NTSC_NORMAL_PAR_X 10
104 #define NTSC_NORMAL_PAR_Y 11
105 #define NTSC_WIDE_PAR_X 40
106 #define NTSC_WIDE_PAR_Y 33
108 GST_DEBUG_CATEGORY_STATIC (dvdemux_debug);
109 #define GST_CAT_DEFAULT dvdemux_debug
111 static GstStaticPadTemplate sink_temp = GST_STATIC_PAD_TEMPLATE ("sink",
114 GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) true")
117 static GstStaticPadTemplate video_src_temp = GST_STATIC_PAD_TEMPLATE ("video",
120 GST_STATIC_CAPS ("video/x-dv, systemstream = (boolean) false")
123 static GstStaticPadTemplate audio_src_temp = GST_STATIC_PAD_TEMPLATE ("audio",
126 GST_STATIC_CAPS ("audio/x-raw, "
127 "format = (string) " GST_AUDIO_NE (S16) ", "
128 "layout = (string) interleaved, "
129 "rate = (int) { 32000, 44100, 48000 }, " "channels = (int) {2, 4}")
133 #define gst_dvdemux_parent_class parent_class
134 G_DEFINE_TYPE (GstDVDemux, gst_dvdemux, GST_TYPE_ELEMENT);
136 static void gst_dvdemux_finalize (GObject * object);
138 /* query functions */
139 static gboolean gst_dvdemux_src_query (GstPad * pad, GstObject * parent,
141 static gboolean gst_dvdemux_sink_query (GstPad * pad, GstObject * parent,
144 /* convert functions */
145 static gboolean gst_dvdemux_sink_convert (GstDVDemux * demux,
146 GstFormat src_format, gint64 src_value, GstFormat * dest_format,
147 gint64 * dest_value);
148 static gboolean gst_dvdemux_src_convert (GstDVDemux * demux, GstPad * pad,
149 GstFormat src_format, gint64 src_value, GstFormat * dest_format,
150 gint64 * dest_value);
152 /* event functions */
153 static gboolean gst_dvdemux_send_event (GstElement * element, GstEvent * event);
154 static gboolean gst_dvdemux_handle_src_event (GstPad * pad, GstObject * parent,
156 static gboolean gst_dvdemux_handle_sink_event (GstPad * pad, GstObject * parent,
159 /* scheduling functions */
160 static void gst_dvdemux_loop (GstPad * pad);
161 static GstFlowReturn gst_dvdemux_flush (GstDVDemux * dvdemux);
162 static GstFlowReturn gst_dvdemux_chain (GstPad * pad, GstObject * parent,
165 /* state change functions */
166 static gboolean gst_dvdemux_sink_activate (GstPad * sinkpad,
168 static gboolean gst_dvdemux_sink_activate_mode (GstPad * sinkpad,
169 GstObject * parent, GstPadMode mode, gboolean active);
170 static GstStateChangeReturn gst_dvdemux_change_state (GstElement * element,
171 GstStateChange transition);
174 gst_dvdemux_class_init (GstDVDemuxClass * klass)
176 GObjectClass *gobject_class;
177 GstElementClass *gstelement_class;
179 gobject_class = (GObjectClass *) klass;
180 gstelement_class = (GstElementClass *) klass;
182 gobject_class->finalize = gst_dvdemux_finalize;
184 gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_dvdemux_change_state);
185 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_dvdemux_send_event);
187 gst_element_class_add_pad_template (gstelement_class,
188 gst_static_pad_template_get (&sink_temp));
189 gst_element_class_add_pad_template (gstelement_class,
190 gst_static_pad_template_get (&video_src_temp));
191 gst_element_class_add_pad_template (gstelement_class,
192 gst_static_pad_template_get (&audio_src_temp));
194 gst_element_class_set_static_metadata (gstelement_class,
195 "DV system stream demuxer", "Codec/Demuxer",
196 "Uses libdv to separate DV audio from DV video (libdv.sourceforge.net)",
197 "Erik Walthinsen <omega@cse.ogi.edu>, Wim Taymans <wim@fluendo.com>");
199 GST_DEBUG_CATEGORY_INIT (dvdemux_debug, "dvdemux", 0, "DV demuxer element");
203 gst_dvdemux_init (GstDVDemux * dvdemux)
207 dvdemux->sinkpad = gst_pad_new_from_static_template (&sink_temp, "sink");
208 /* we can operate in pull and push mode so we install
209 * a custom activate function */
210 gst_pad_set_activate_function (dvdemux->sinkpad,
211 GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate));
212 /* the function to activate in push mode */
213 gst_pad_set_activatemode_function (dvdemux->sinkpad,
214 GST_DEBUG_FUNCPTR (gst_dvdemux_sink_activate_mode));
215 /* for push mode, this is the chain function */
216 gst_pad_set_chain_function (dvdemux->sinkpad,
217 GST_DEBUG_FUNCPTR (gst_dvdemux_chain));
218 /* handling events (in push mode only) */
219 gst_pad_set_event_function (dvdemux->sinkpad,
220 GST_DEBUG_FUNCPTR (gst_dvdemux_handle_sink_event));
221 /* query functions */
222 gst_pad_set_query_function (dvdemux->sinkpad,
223 GST_DEBUG_FUNCPTR (gst_dvdemux_sink_query));
225 /* now add the pad */
226 gst_element_add_pad (GST_ELEMENT (dvdemux), dvdemux->sinkpad);
228 dvdemux->adapter = gst_adapter_new ();
230 /* we need 4 temp buffers for audio decoding which are of a static
231 * size and which we can allocate here */
232 for (i = 0; i < 4; i++) {
233 dvdemux->audio_buffers[i] =
234 (gint16 *) g_malloc (DV_AUDIO_MAX_SAMPLES * sizeof (gint16));
239 gst_dvdemux_finalize (GObject * object)
244 dvdemux = GST_DVDEMUX (object);
246 g_object_unref (dvdemux->adapter);
248 /* clean up temp audio buffers */
249 for (i = 0; i < 4; i++) {
250 g_free (dvdemux->audio_buffers[i]);
253 G_OBJECT_CLASS (parent_class)->finalize (object);
256 /* reset to default values before starting streaming */
258 gst_dvdemux_reset (GstDVDemux * dvdemux)
260 dvdemux->frame_offset = 0;
261 dvdemux->audio_offset = 0;
262 dvdemux->video_offset = 0;
263 dvdemux->framecount = 0;
264 g_atomic_int_set (&dvdemux->found_header, 0);
265 dvdemux->frame_len = -1;
266 dvdemux->need_segment = FALSE;
267 dvdemux->new_media = FALSE;
268 dvdemux->framerate_numerator = 0;
269 dvdemux->framerate_denominator = 0;
271 dvdemux->frequency = 0;
272 dvdemux->channels = 0;
273 dvdemux->wide = FALSE;
274 gst_segment_init (&dvdemux->byte_segment, GST_FORMAT_BYTES);
275 gst_segment_init (&dvdemux->time_segment, GST_FORMAT_TIME);
279 gst_dvdemux_add_pad (GstDVDemux * dvdemux, GstStaticPadTemplate * template)
281 gboolean no_more_pads;
284 pad = gst_pad_new_from_static_template (template, template->name_template);
286 gst_pad_set_query_function (pad, GST_DEBUG_FUNCPTR (gst_dvdemux_src_query));
288 gst_pad_set_event_function (pad,
289 GST_DEBUG_FUNCPTR (gst_dvdemux_handle_src_event));
290 gst_pad_use_fixed_caps (pad);
291 gst_pad_set_active (pad, TRUE);
292 gst_element_add_pad (GST_ELEMENT (dvdemux), pad);
295 (dvdemux->videosrcpad != NULL && template == &audio_src_temp) ||
296 (dvdemux->audiosrcpad != NULL && template == &video_src_temp);
299 gst_element_no_more_pads (GST_ELEMENT (dvdemux));
301 gst_pad_push_event (pad, gst_event_new_segment (&dvdemux->time_segment));
304 gst_pad_push_event (pad,
305 gst_event_new_tag ("GstDemuxer",
306 gst_tag_list_new (GST_TAG_CONTAINER_FORMAT, "DV", NULL)));
313 gst_dvdemux_remove_pads (GstDVDemux * dvdemux)
315 if (dvdemux->videosrcpad) {
316 gst_element_remove_pad (GST_ELEMENT (dvdemux), dvdemux->videosrcpad);
317 dvdemux->videosrcpad = NULL;
319 if (dvdemux->audiosrcpad) {
320 gst_element_remove_pad (GST_ELEMENT (dvdemux), dvdemux->audiosrcpad);
321 dvdemux->audiosrcpad = NULL;
326 gst_dvdemux_src_convert (GstDVDemux * dvdemux, GstPad * pad,
327 GstFormat src_format, gint64 src_value, GstFormat * dest_format,
332 if (*dest_format == src_format || src_value == -1) {
333 *dest_value = src_value;
337 if (dvdemux->frame_len <= 0)
340 if (dvdemux->decoder == NULL)
343 GST_INFO_OBJECT (pad,
344 "src_value:%" G_GINT64_FORMAT ", src_format:%d, dest_format:%d",
345 src_value, src_format, *dest_format);
347 switch (src_format) {
348 case GST_FORMAT_BYTES:
349 switch (*dest_format) {
350 case GST_FORMAT_DEFAULT:
351 if (pad == dvdemux->videosrcpad)
352 *dest_value = src_value / dvdemux->frame_len;
353 else if (pad == dvdemux->audiosrcpad)
354 *dest_value = src_value / (2 * dvdemux->channels);
356 case GST_FORMAT_TIME:
357 *dest_format = GST_FORMAT_TIME;
358 if (pad == dvdemux->videosrcpad)
359 *dest_value = gst_util_uint64_scale (src_value,
360 GST_SECOND * dvdemux->framerate_denominator,
361 dvdemux->frame_len * dvdemux->framerate_numerator);
362 else if (pad == dvdemux->audiosrcpad)
363 *dest_value = gst_util_uint64_scale_int (src_value, GST_SECOND,
364 2 * dvdemux->frequency * dvdemux->channels);
370 case GST_FORMAT_TIME:
371 switch (*dest_format) {
372 case GST_FORMAT_BYTES:
373 if (pad == dvdemux->videosrcpad)
374 *dest_value = gst_util_uint64_scale (src_value,
375 dvdemux->frame_len * dvdemux->framerate_numerator,
376 dvdemux->framerate_denominator * GST_SECOND);
377 else if (pad == dvdemux->audiosrcpad)
378 *dest_value = gst_util_uint64_scale_int (src_value,
379 2 * dvdemux->frequency * dvdemux->channels, GST_SECOND);
381 case GST_FORMAT_DEFAULT:
382 if (pad == dvdemux->videosrcpad) {
384 *dest_value = gst_util_uint64_scale (src_value,
385 dvdemux->framerate_numerator,
386 dvdemux->framerate_denominator * GST_SECOND);
389 } else if (pad == dvdemux->audiosrcpad) {
390 *dest_value = gst_util_uint64_scale (src_value,
391 dvdemux->frequency, GST_SECOND);
398 case GST_FORMAT_DEFAULT:
399 switch (*dest_format) {
400 case GST_FORMAT_TIME:
401 if (pad == dvdemux->videosrcpad) {
402 *dest_value = gst_util_uint64_scale (src_value,
403 GST_SECOND * dvdemux->framerate_denominator,
404 dvdemux->framerate_numerator);
405 } else if (pad == dvdemux->audiosrcpad) {
407 *dest_value = gst_util_uint64_scale (src_value,
408 GST_SECOND, dvdemux->frequency);
413 case GST_FORMAT_BYTES:
414 if (pad == dvdemux->videosrcpad) {
415 *dest_value = src_value * dvdemux->frame_len;
416 } else if (pad == dvdemux->audiosrcpad) {
417 *dest_value = src_value * 2 * dvdemux->channels;
429 GST_INFO_OBJECT (pad,
430 "Result : dest_format:%d, dest_value:%" G_GINT64_FORMAT ", res:%d",
431 *dest_format, *dest_value, res);
437 GST_INFO ("source conversion failed");
443 gst_dvdemux_sink_convert (GstDVDemux * dvdemux, GstFormat src_format,
444 gint64 src_value, GstFormat * dest_format, gint64 * dest_value)
448 GST_DEBUG_OBJECT (dvdemux, "%d -> %d", src_format, *dest_format);
449 GST_INFO_OBJECT (dvdemux,
450 "src_value:%" G_GINT64_FORMAT ", src_format:%d, dest_format:%d",
451 src_value, src_format, *dest_format);
453 if (*dest_format == GST_FORMAT_DEFAULT)
454 *dest_format = GST_FORMAT_TIME;
456 if (*dest_format == src_format || src_value == -1) {
457 *dest_value = src_value;
461 if (dvdemux->frame_len <= 0)
464 switch (src_format) {
465 case GST_FORMAT_BYTES:
466 switch (*dest_format) {
467 case GST_FORMAT_TIME:
471 /* get frame number, rounds down so don't combine this
472 * line and the next line. */
473 frame = src_value / dvdemux->frame_len;
475 *dest_value = gst_util_uint64_scale (frame,
476 GST_SECOND * dvdemux->framerate_denominator,
477 dvdemux->framerate_numerator);
484 case GST_FORMAT_TIME:
485 switch (*dest_format) {
486 case GST_FORMAT_BYTES:
490 /* calculate the frame */
492 gst_util_uint64_scale (src_value, dvdemux->framerate_numerator,
493 dvdemux->framerate_denominator * GST_SECOND);
495 /* calculate the offset from the rounded frame */
496 *dest_value = frame * dvdemux->frame_len;
506 GST_INFO_OBJECT (dvdemux,
507 "Result : dest_format:%d, dest_value:%" G_GINT64_FORMAT ", res:%d",
508 *dest_format, *dest_value, res);
515 GST_INFO_OBJECT (dvdemux, "sink conversion failed");
521 gst_dvdemux_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
526 dvdemux = GST_DVDEMUX (parent);
528 switch (GST_QUERY_TYPE (query)) {
529 case GST_QUERY_POSITION:
534 /* get target format */
535 gst_query_parse_position (query, &format, NULL);
537 /* bring the position to the requested format. */
538 if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
539 GST_FORMAT_TIME, dvdemux->time_segment.position,
542 gst_query_set_position (query, format, cur);
545 case GST_QUERY_DURATION:
551 /* First ask the peer in the original format */
552 if (!gst_pad_peer_query (dvdemux->sinkpad, query)) {
553 /* get target format */
554 gst_query_parse_duration (query, &format, NULL);
556 /* change query to bytes to perform on peer */
557 gst_query_set_duration (query, GST_FORMAT_BYTES, -1);
559 /* Now ask the peer in BYTES format and try to convert */
560 if (!gst_pad_peer_query (dvdemux->sinkpad, query)) {
564 /* get peer total length */
565 gst_query_parse_duration (query, NULL, &end);
567 /* convert end to requested format */
570 if (!(res = gst_dvdemux_sink_convert (dvdemux,
571 GST_FORMAT_BYTES, end, &format2, &end))) {
574 gst_query_set_duration (query, format, end);
579 case GST_QUERY_CONVERT:
581 GstFormat src_fmt, dest_fmt;
582 gint64 src_val, dest_val;
584 gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
586 gst_dvdemux_src_convert (dvdemux, pad, src_fmt, src_val,
587 &dest_fmt, &dest_val)))
589 gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
593 res = gst_pad_query_default (pad, parent, query);
602 GST_DEBUG ("error source query");
608 gst_dvdemux_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
613 dvdemux = GST_DVDEMUX (parent);
615 switch (GST_QUERY_TYPE (query)) {
616 case GST_QUERY_CONVERT:
618 GstFormat src_fmt, dest_fmt;
619 gint64 src_val, dest_val;
621 gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
623 gst_dvdemux_sink_convert (dvdemux, src_fmt, src_val, &dest_fmt,
626 gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
630 res = gst_pad_query_default (pad, parent, query);
639 GST_DEBUG ("error handling sink query");
644 /* takes ownership of the event */
646 gst_dvdemux_push_event (GstDVDemux * dvdemux, GstEvent * event)
648 gboolean res = FALSE;
650 if (dvdemux->videosrcpad) {
651 gst_event_ref (event);
652 res |= gst_pad_push_event (dvdemux->videosrcpad, event);
655 if (dvdemux->audiosrcpad)
656 res |= gst_pad_push_event (dvdemux->audiosrcpad, event);
658 gst_event_unref (event);
664 gst_dvdemux_handle_sink_event (GstPad * pad, GstObject * parent,
667 GstDVDemux *dvdemux = GST_DVDEMUX (parent);
670 switch (GST_EVENT_TYPE (event)) {
671 case GST_EVENT_FLUSH_START:
672 /* we are not blocking on anything exect the push() calls
673 * to the peer which will be unblocked by forwarding the
675 res = gst_dvdemux_push_event (dvdemux, event);
677 case GST_EVENT_FLUSH_STOP:
678 gst_adapter_clear (dvdemux->adapter);
679 GST_DEBUG ("cleared adapter");
680 gst_segment_init (&dvdemux->byte_segment, GST_FORMAT_BYTES);
681 gst_segment_init (&dvdemux->time_segment, GST_FORMAT_TIME);
682 res = gst_dvdemux_push_event (dvdemux, event);
684 case GST_EVENT_SEGMENT:
686 const GstSegment *segment;
688 gst_event_parse_segment (event, &segment);
689 switch (segment->format) {
690 case GST_FORMAT_BYTES:
691 gst_segment_copy_into (segment, &dvdemux->byte_segment);
694 /* FIXME ?? no longer such subtle distinction in 0.11 */
695 /* the update can always be sent */
699 update = gst_event_new_new_segment (TRUE,
700 dvdemux->time_segment.rate, dvdemux->time_segment.format,
701 dvdemux->time_segment.start, dvdemux->time_segment.position,
702 dvdemux->time_segment.time);
704 gst_dvdemux_push_event (dvdemux, update);
706 /* and queue a SEGMENT before sending the next set of buffers, we
707 * cannot convert to time yet as we might not know the size of the
709 dvdemux->need_segment = TRUE;
712 dvdemux->need_segment = TRUE;
713 gst_event_unref (event);
715 case GST_FORMAT_TIME:
716 gst_segment_copy_into (segment, &dvdemux->time_segment);
718 /* and we can just forward this time event */
719 res = gst_dvdemux_push_event (dvdemux, event);
722 gst_event_unref (event);
723 /* cannot accept this format */
730 /* flush any pending data, should be nothing left. */
731 gst_dvdemux_flush (dvdemux);
733 res = gst_dvdemux_push_event (dvdemux, event);
734 /* and clear the adapter */
735 gst_adapter_clear (dvdemux->adapter);
738 gst_event_unref (event);
741 res = gst_dvdemux_push_event (dvdemux, event);
748 /* convert a pair of values on the given srcpad */
750 gst_dvdemux_convert_src_pair (GstDVDemux * dvdemux, GstPad * pad,
751 GstFormat src_format, gint64 src_start, gint64 src_stop,
752 GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
756 GST_INFO ("starting conversion of start");
757 /* bring the format to time on srcpad. */
758 if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
759 src_format, src_start, &dst_format, dst_start))) {
762 GST_INFO ("Finished conversion of start: %" G_GINT64_FORMAT, *dst_start);
764 GST_INFO ("starting conversion of stop");
765 /* bring the format to time on srcpad. */
766 if (!(res = gst_dvdemux_src_convert (dvdemux, pad,
767 src_format, src_stop, &dst_format, dst_stop))) {
768 /* could not convert seek format to time offset */
771 GST_INFO ("Finished conversion of stop: %" G_GINT64_FORMAT, *dst_stop);
776 /* convert a pair of values on the sinkpad */
778 gst_dvdemux_convert_sink_pair (GstDVDemux * dvdemux,
779 GstFormat src_format, gint64 src_start, gint64 src_stop,
780 GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
784 GST_INFO ("starting conversion of start");
785 /* bring the format to time on srcpad. */
786 if (!(res = gst_dvdemux_sink_convert (dvdemux,
787 src_format, src_start, &dst_format, dst_start))) {
790 GST_INFO ("Finished conversion of start: %" G_GINT64_FORMAT, *dst_start);
792 GST_INFO ("starting conversion of stop");
793 /* bring the format to time on srcpad. */
794 if (!(res = gst_dvdemux_sink_convert (dvdemux,
795 src_format, src_stop, &dst_format, dst_stop))) {
796 /* could not convert seek format to time offset */
799 GST_INFO ("Finished conversion of stop: %" G_GINT64_FORMAT, *dst_stop);
804 /* convert a pair of values on the srcpad to a pair of
805 * values on the sinkpad
808 gst_dvdemux_convert_src_to_sink (GstDVDemux * dvdemux, GstPad * pad,
809 GstFormat src_format, gint64 src_start, gint64 src_stop,
810 GstFormat dst_format, gint64 * dst_start, gint64 * dst_stop)
815 conv = GST_FORMAT_TIME;
816 /* convert to TIME intermediate format */
817 if (!(res = gst_dvdemux_convert_src_pair (dvdemux, pad,
818 src_format, src_start, src_stop, conv, dst_start, dst_stop))) {
819 /* could not convert format to time offset */
822 /* convert to dst format on sinkpad */
823 if (!(res = gst_dvdemux_convert_sink_pair (dvdemux,
824 conv, *dst_start, *dst_stop, dst_format, dst_start, dst_stop))) {
825 /* could not convert format to time offset */
834 gst_dvdemux_convert_segment (GstDVDemux * dvdemux, GstSegment * src,
837 dest->rate = src->rate;
838 dest->abs_rate = src->abs_rate;
839 dest->flags = src->flags;
845 /* handle seek in push base mode.
847 * Convert the time seek to a bytes seek and send it
849 * Does not take ownership of the event.
852 gst_dvdemux_handle_push_seek (GstDVDemux * dvdemux, GstPad * pad,
855 gboolean res = FALSE;
859 GstSeekType cur_type, stop_type;
861 gint64 start_position, end_position;
864 gst_event_parse_seek (event, &rate, &format, &flags,
865 &cur_type, &cur, &stop_type, &stop);
867 /* First try if upstream can handle time based seeks */
868 if (format == GST_FORMAT_TIME)
869 res = gst_pad_push_event (dvdemux->sinkpad, gst_event_ref (event));
872 /* we convert the start/stop on the srcpad to the byte format
873 * on the sinkpad and forward the event */
874 res = gst_dvdemux_convert_src_to_sink (dvdemux, pad,
875 format, cur, stop, GST_FORMAT_BYTES, &start_position, &end_position);
879 /* now this is the updated seek event on bytes */
880 newevent = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
881 cur_type, start_position, stop_type, end_position);
883 res = gst_pad_push_event (dvdemux->sinkpad, newevent);
889 /* position ourselves to the configured segment, used in pull mode.
890 * The input segment is in TIME format. We convert the time values
891 * to bytes values into our byte_segment which we use to pull data from
895 gst_dvdemux_do_seek (GstDVDemux * demux, GstSegment * segment)
900 /* position to value configured is last_stop, this will round down
901 * to the byte position where the frame containing the given
902 * timestamp can be found. */
903 format = GST_FORMAT_BYTES;
904 res = gst_dvdemux_sink_convert (demux,
905 segment->format, segment->position,
906 &format, (gint64 *) & demux->byte_segment.position);
910 /* update byte segment start */
911 gst_dvdemux_sink_convert (demux,
912 segment->format, segment->start, &format,
913 (gint64 *) & demux->byte_segment.start);
915 /* update byte segment stop */
916 gst_dvdemux_sink_convert (demux,
917 segment->format, segment->stop, &format,
918 (gint64 *) & demux->byte_segment.stop);
920 /* update byte segment time */
921 gst_dvdemux_sink_convert (demux,
922 segment->format, segment->time, &format,
923 (gint64 *) & demux->byte_segment.time);
925 /* calculate current frame number */
926 format = GST_FORMAT_DEFAULT;
927 gst_dvdemux_src_convert (demux, demux->videosrcpad,
928 segment->format, segment->start, &format, &demux->video_offset);
930 /* calculate current audio number */
931 format = GST_FORMAT_DEFAULT;
932 gst_dvdemux_src_convert (demux, demux->audiosrcpad,
933 segment->format, segment->start, &format, &demux->audio_offset);
935 /* every DV frame corresponts with one video frame */
936 demux->frame_offset = demux->video_offset;
942 /* handle seek in pull base mode.
944 * Does not take ownership of the event.
947 gst_dvdemux_handle_pull_seek (GstDVDemux * demux, GstPad * pad,
954 GstSeekType cur_type, stop_type;
958 GstSegment seeksegment;
960 GST_DEBUG_OBJECT (demux, "doing seek");
962 /* first bring the event format to TIME, our native format
963 * to perform the seek on */
967 gst_event_parse_seek (event, &rate, &format, &flags,
968 &cur_type, &cur, &stop_type, &stop);
970 /* can't seek backwards yet */
974 /* convert input format to TIME */
975 conv = GST_FORMAT_TIME;
976 if (!(gst_dvdemux_convert_src_pair (demux, pad,
977 format, cur, stop, conv, &cur, &stop)))
980 format = GST_FORMAT_TIME;
985 flush = flags & GST_SEEK_FLAG_FLUSH;
987 /* send flush start */
989 gst_dvdemux_push_event (demux, gst_event_new_flush_start ());
991 gst_pad_pause_task (demux->sinkpad);
993 /* grab streaming lock, this should eventually be possible, either
994 * because the task is paused or our streaming thread stopped
995 * because our peer is flushing. */
996 GST_PAD_STREAM_LOCK (demux->sinkpad);
998 /* make copy into temp structure, we can only update the main one
999 * when the subclass actually could to the seek. */
1000 memcpy (&seeksegment, &demux->time_segment, sizeof (GstSegment));
1002 /* now configure the seek segment */
1004 gst_segment_do_seek (&seeksegment, rate, format, flags,
1005 cur_type, cur, stop_type, stop, &update);
1008 GST_DEBUG_OBJECT (demux, "segment configured from %" G_GINT64_FORMAT
1009 " to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
1010 seeksegment.start, seeksegment.stop, seeksegment.position);
1012 /* do the seek, segment.position contains new position. */
1013 res = gst_dvdemux_do_seek (demux, &seeksegment);
1015 /* and prepare to continue streaming */
1017 /* send flush stop, peer will accept data and events again. We
1018 * are not yet providing data as we still have the STREAM_LOCK. */
1019 gst_dvdemux_push_event (demux, gst_event_new_flush_stop (TRUE));
1022 /* if successfull seek, we update our real segment and push
1023 * out the new segment. */
1025 memcpy (&demux->time_segment, &seeksegment, sizeof (GstSegment));
1027 if (demux->time_segment.flags & GST_SEEK_FLAG_SEGMENT) {
1028 gst_element_post_message (GST_ELEMENT_CAST (demux),
1029 gst_message_new_segment_start (GST_OBJECT_CAST (demux),
1030 demux->time_segment.format, demux->time_segment.position));
1032 if ((stop = demux->time_segment.stop) == -1)
1033 stop = demux->time_segment.duration;
1035 GST_INFO_OBJECT (demux,
1036 "Saving newsegment event to be sent in streaming thread");
1038 if (demux->pending_segment)
1039 gst_event_unref (demux->pending_segment);
1041 demux->pending_segment = gst_event_new_segment (&demux->time_segment);
1043 demux->need_segment = FALSE;
1046 /* and restart the task in case it got paused explicitely or by
1047 * the FLUSH_START event we pushed out. */
1048 gst_pad_start_task (demux->sinkpad, (GstTaskFunction) gst_dvdemux_loop,
1049 demux->sinkpad, NULL);
1051 /* and release the lock again so we can continue streaming */
1052 GST_PAD_STREAM_UNLOCK (demux->sinkpad);
1059 GST_DEBUG_OBJECT (demux, "negative playback rate %lf not supported.", rate);
1064 GST_DEBUG_OBJECT (demux, "cannot convert to TIME format, seek aborted.");
1070 gst_dvdemux_send_event (GstElement * element, GstEvent * event)
1072 GstDVDemux *dvdemux = GST_DVDEMUX (element);
1073 gboolean res = FALSE;
1075 switch (GST_EVENT_TYPE (event)) {
1076 case GST_EVENT_SEEK:
1078 /* checking header and configuring the seek must be atomic */
1079 GST_OBJECT_LOCK (dvdemux);
1080 if (g_atomic_int_get (&dvdemux->found_header) == 0) {
1083 event_p = &dvdemux->seek_event;
1085 /* We don't have pads yet. Keep the event. */
1086 GST_INFO_OBJECT (dvdemux, "Keeping the seek event for later");
1088 gst_event_replace (event_p, event);
1089 GST_OBJECT_UNLOCK (dvdemux);
1093 GST_OBJECT_UNLOCK (dvdemux);
1095 if (dvdemux->seek_handler) {
1096 res = dvdemux->seek_handler (dvdemux, dvdemux->videosrcpad, event);
1097 gst_event_unref (event);
1103 res = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
1110 /* handle an event on the source pad, it's most likely a seek */
1112 gst_dvdemux_handle_src_event (GstPad * pad, GstObject * parent,
1115 gboolean res = TRUE;
1116 GstDVDemux *dvdemux;
1118 dvdemux = GST_DVDEMUX (parent);
1120 switch (GST_EVENT_TYPE (event)) {
1121 case GST_EVENT_SEEK:
1122 /* seek handler is installed based on scheduling mode */
1123 if (dvdemux->seek_handler)
1124 res = dvdemux->seek_handler (dvdemux, pad, event);
1129 /* we can't really (yet) do QoS */
1132 case GST_EVENT_NAVIGATION:
1133 case GST_EVENT_CAPS:
1134 /* no navigation or caps either... */
1138 res = gst_pad_push_event (dvdemux->sinkpad, event);
1143 gst_event_unref (event);
1148 /* does not take ownership of buffer */
1149 static GstFlowReturn
1150 gst_dvdemux_demux_audio (GstDVDemux * dvdemux, GstBuffer * buffer,
1157 gst_buffer_map (buffer, &map, GST_MAP_READ);
1158 dv_decode_full_audio (dvdemux->decoder, map.data, dvdemux->audio_buffers);
1159 gst_buffer_unmap (buffer, &map);
1161 if (G_LIKELY ((num_samples = dv_get_num_samples (dvdemux->decoder)) > 0)) {
1165 gint frequency, channels;
1167 if (G_UNLIKELY (dvdemux->audiosrcpad == NULL))
1168 dvdemux->audiosrcpad = gst_dvdemux_add_pad (dvdemux, &audio_src_temp);
1170 /* get initial format or check if format changed */
1171 frequency = dv_get_frequency (dvdemux->decoder);
1172 channels = dv_get_num_channels (dvdemux->decoder);
1174 if (G_UNLIKELY ((frequency != dvdemux->frequency)
1175 || (channels != dvdemux->channels))) {
1179 dvdemux->frequency = frequency;
1180 dvdemux->channels = channels;
1182 gst_audio_info_init (&info);
1183 gst_audio_info_set_format (&info, GST_AUDIO_FORMAT_S16LE,
1184 frequency, channels, NULL);
1185 caps = gst_audio_info_to_caps (&info);
1186 gst_pad_push_event (dvdemux->audiosrcpad, gst_event_new_stream_start ());
1187 gst_pad_set_caps (dvdemux->audiosrcpad, caps);
1188 gst_caps_unref (caps);
1191 outbuf = gst_buffer_new_and_alloc (num_samples *
1192 sizeof (gint16) * dvdemux->channels);
1194 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1195 a_ptr = (gint16 *) map.data;
1197 for (i = 0; i < num_samples; i++) {
1198 for (j = 0; j < dvdemux->channels; j++) {
1199 *(a_ptr++) = dvdemux->audio_buffers[j][i];
1202 gst_buffer_unmap (outbuf, &map);
1204 GST_DEBUG ("pushing audio %" GST_TIME_FORMAT,
1205 GST_TIME_ARGS (dvdemux->time_segment.position));
1207 GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->time_segment.position;
1208 GST_BUFFER_DURATION (outbuf) = duration;
1209 GST_BUFFER_OFFSET (outbuf) = dvdemux->audio_offset;
1210 dvdemux->audio_offset += num_samples;
1211 GST_BUFFER_OFFSET_END (outbuf) = dvdemux->audio_offset;
1213 if (dvdemux->new_media)
1214 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
1216 ret = gst_pad_push (dvdemux->audiosrcpad, outbuf);
1225 /* takes ownership of buffer */
1226 static GstFlowReturn
1227 gst_dvdemux_demux_video (GstDVDemux * dvdemux, GstBuffer * buffer,
1233 GstFlowReturn ret = GST_FLOW_OK;
1235 if (G_UNLIKELY (dvdemux->videosrcpad == NULL))
1236 dvdemux->videosrcpad = gst_dvdemux_add_pad (dvdemux, &video_src_temp);
1239 /* framerate is already up-to-date */
1240 height = dvdemux->decoder->height;
1241 wide = dv_format_wide (dvdemux->decoder);
1243 /* see if anything changed */
1244 if (G_UNLIKELY ((dvdemux->height != height) || dvdemux->wide != wide)) {
1248 dvdemux->height = height;
1249 dvdemux->wide = wide;
1251 if (dvdemux->decoder->system == e_dv_system_625_50) {
1253 par_x = PAL_WIDE_PAR_X;
1254 par_y = PAL_WIDE_PAR_Y;
1256 par_x = PAL_NORMAL_PAR_X;
1257 par_y = PAL_NORMAL_PAR_Y;
1261 par_x = NTSC_WIDE_PAR_X;
1262 par_y = NTSC_WIDE_PAR_Y;
1264 par_x = NTSC_NORMAL_PAR_X;
1265 par_y = NTSC_NORMAL_PAR_Y;
1269 caps = gst_caps_new_simple ("video/x-dv",
1270 "systemstream", G_TYPE_BOOLEAN, FALSE,
1271 "width", G_TYPE_INT, 720,
1272 "height", G_TYPE_INT, height,
1273 "framerate", GST_TYPE_FRACTION, dvdemux->framerate_numerator,
1274 dvdemux->framerate_denominator,
1275 "pixel-aspect-ratio", GST_TYPE_FRACTION, par_x, par_y, NULL);
1276 gst_pad_push_event (dvdemux->videosrcpad, gst_event_new_stream_start ());
1277 gst_pad_set_caps (dvdemux->videosrcpad, caps);
1278 gst_caps_unref (caps);
1281 /* takes ownership of buffer here, we just need to modify
1283 outbuf = gst_buffer_make_writable (buffer);
1285 GST_BUFFER_TIMESTAMP (outbuf) = dvdemux->time_segment.position;
1286 GST_BUFFER_OFFSET (outbuf) = dvdemux->video_offset;
1287 GST_BUFFER_OFFSET_END (outbuf) = dvdemux->video_offset + 1;
1288 GST_BUFFER_DURATION (outbuf) = duration;
1290 if (dvdemux->new_media)
1291 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
1293 GST_DEBUG ("pushing video %" GST_TIME_FORMAT,
1294 GST_TIME_ARGS (dvdemux->time_segment.position));
1296 ret = gst_pad_push (dvdemux->videosrcpad, outbuf);
1298 dvdemux->video_offset++;
1304 get_ssyb_offset (int dif, int ssyb)
1308 offset = dif * 12000; /* to dif */
1309 offset += 80 * (1 + (ssyb / 6)); /* to subcode pack */
1310 offset += 3; /* past header */
1311 offset += 8 * (ssyb % 6); /* to ssyb */
1317 gst_dvdemux_get_timecode (GstDVDemux * dvdemux, GstBuffer * buffer,
1318 GstSMPTETimeCode * timecode)
1324 int n_difs = dvdemux->decoder->num_dif_seqs;
1326 gst_buffer_map (buffer, &map, GST_MAP_READ);
1328 for (dif = 0; dif < n_difs; dif++) {
1329 offset = get_ssyb_offset (dif, 3);
1330 if (data[offset + 3] == 0x13) {
1331 timecode->frames = ((data[offset + 4] >> 4) & 0x3) * 10 +
1332 (data[offset + 4] & 0xf);
1333 timecode->seconds = ((data[offset + 5] >> 4) & 0x3) * 10 +
1334 (data[offset + 5] & 0xf);
1335 timecode->minutes = ((data[offset + 6] >> 4) & 0x3) * 10 +
1336 (data[offset + 6] & 0xf);
1337 timecode->hours = ((data[offset + 7] >> 4) & 0x3) * 10 +
1338 (data[offset + 7] & 0xf);
1339 GST_DEBUG ("got timecode %" GST_SMPTE_TIME_CODE_FORMAT,
1340 GST_SMPTE_TIME_CODE_ARGS (timecode));
1341 gst_buffer_unmap (buffer, &map);
1346 gst_buffer_unmap (buffer, &map);
1351 gst_dvdemux_is_new_media (GstDVDemux * dvdemux, GstBuffer * buffer)
1359 n_difs = dvdemux->decoder->num_dif_seqs;
1361 gst_buffer_map (buffer, &map, GST_MAP_READ);
1363 for (dif = 0; dif < n_difs; dif++) {
1365 aaux_offset = (dif * 12000) + (6 + 16 * 1) * 80 + 3;
1367 aaux_offset = (dif * 12000) + (6 + 16 * 4) * 80 + 3;
1369 if (data[aaux_offset + 0] == 0x51) {
1370 if ((data[aaux_offset + 2] & 0x80) == 0) {
1371 gst_buffer_unmap (buffer, &map);
1377 gst_buffer_unmap (buffer, &map);
1381 /* takes ownership of buffer */
1382 static GstFlowReturn
1383 gst_dvdemux_demux_frame (GstDVDemux * dvdemux, GstBuffer * buffer)
1385 GstClockTime next_ts;
1386 GstFlowReturn aret, vret, ret;
1389 GstSMPTETimeCode timecode;
1392 if (G_UNLIKELY (dvdemux->need_segment)) {
1395 /* convert to time and store as start/end_timestamp */
1396 format = GST_FORMAT_TIME;
1397 if (!(gst_dvdemux_convert_sink_pair (dvdemux,
1398 GST_FORMAT_BYTES, dvdemux->byte_segment.start,
1399 dvdemux->byte_segment.stop, format,
1400 (gint64 *) & dvdemux->time_segment.start,
1401 (gint64 *) & dvdemux->time_segment.stop)))
1404 dvdemux->time_segment.rate = dvdemux->byte_segment.rate;
1405 dvdemux->time_segment.position = dvdemux->time_segment.start;
1407 /* calculate current frame number */
1408 format = GST_FORMAT_DEFAULT;
1409 if (!(gst_dvdemux_src_convert (dvdemux, dvdemux->videosrcpad,
1410 GST_FORMAT_TIME, dvdemux->time_segment.start,
1411 &format, &dvdemux->frame_offset)))
1414 GST_DEBUG_OBJECT (dvdemux, "sending segment start: %" GST_TIME_FORMAT
1415 ", stop: %" GST_TIME_FORMAT ", time: %" GST_TIME_FORMAT,
1416 GST_TIME_ARGS (dvdemux->time_segment.start),
1417 GST_TIME_ARGS (dvdemux->time_segment.stop),
1418 GST_TIME_ARGS (dvdemux->time_segment.start));
1420 gst_dvdemux_push_event (dvdemux,
1421 gst_event_new_segment (&dvdemux->time_segment));
1423 dvdemux->need_segment = FALSE;
1426 gst_dvdemux_get_timecode (dvdemux, buffer, &timecode);
1427 gst_smpte_time_code_get_frame_number (
1428 (dvdemux->decoder->system == e_dv_system_625_50) ?
1429 GST_SMPTE_TIME_CODE_SYSTEM_25 : GST_SMPTE_TIME_CODE_SYSTEM_30,
1430 &frame_number, &timecode);
1432 next_ts = gst_util_uint64_scale_int (
1433 (dvdemux->frame_offset + 1) * GST_SECOND,
1434 dvdemux->framerate_denominator, dvdemux->framerate_numerator);
1435 duration = next_ts - dvdemux->time_segment.position;
1437 gst_buffer_map (buffer, &map, GST_MAP_READ);
1438 dv_parse_packs (dvdemux->decoder, map.data);
1439 gst_buffer_unmap (buffer, &map);
1440 dvdemux->new_media = FALSE;
1441 if (gst_dvdemux_is_new_media (dvdemux, buffer) &&
1442 dvdemux->frames_since_new_media > 2) {
1443 dvdemux->new_media = TRUE;
1444 dvdemux->frames_since_new_media = 0;
1446 dvdemux->frames_since_new_media++;
1448 /* does not take ownership of buffer */
1449 aret = ret = gst_dvdemux_demux_audio (dvdemux, buffer, duration);
1450 if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED)) {
1451 gst_buffer_unref (buffer);
1455 /* takes ownership of buffer */
1456 vret = ret = gst_dvdemux_demux_video (dvdemux, buffer, duration);
1457 if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED))
1460 /* if both are not linked, we stop */
1461 if (G_UNLIKELY (aret == GST_FLOW_NOT_LINKED && vret == GST_FLOW_NOT_LINKED)) {
1462 ret = GST_FLOW_NOT_LINKED;
1466 dvdemux->time_segment.position = next_ts;
1467 dvdemux->frame_offset++;
1469 /* check for the end of the segment */
1470 if (dvdemux->time_segment.stop != -1 && next_ts > dvdemux->time_segment.stop)
1481 GST_DEBUG ("error generating new_segment event");
1482 gst_buffer_unref (buffer);
1483 return GST_FLOW_ERROR;
1487 /* flush any remaining data in the adapter, used in chain based scheduling mode */
1488 static GstFlowReturn
1489 gst_dvdemux_flush (GstDVDemux * dvdemux)
1491 GstFlowReturn ret = GST_FLOW_OK;
1493 while (gst_adapter_available (dvdemux->adapter) >= dvdemux->frame_len) {
1497 /* get the accumulated bytes */
1498 data = gst_adapter_map (dvdemux->adapter, dvdemux->frame_len);
1500 /* parse header to know the length and other params */
1501 if (G_UNLIKELY (dv_parse_header (dvdemux->decoder, data) < 0)) {
1502 gst_adapter_unmap (dvdemux->adapter);
1503 goto parse_header_error;
1505 gst_adapter_unmap (dvdemux->adapter);
1507 /* after parsing the header we know the length of the data */
1508 length = dvdemux->frame_len = dvdemux->decoder->frame_size;
1509 if (dvdemux->decoder->system == e_dv_system_625_50) {
1510 dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR;
1511 dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR;
1513 dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR;
1514 dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR;
1516 g_atomic_int_set (&dvdemux->found_header, 1);
1518 /* let demux_video set the height, it needs to detect when things change so
1519 * it can reset caps */
1521 /* if we still have enough for a frame, start decoding */
1522 if (G_LIKELY (gst_adapter_available (dvdemux->adapter) >= length)) {
1525 buffer = gst_adapter_take_buffer (dvdemux->adapter, length);
1527 /* and decode the buffer, takes ownership */
1528 ret = gst_dvdemux_demux_frame (dvdemux, buffer);
1529 if (G_UNLIKELY (ret != GST_FLOW_OK))
1539 GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
1540 (NULL), ("Error parsing DV header"));
1541 return GST_FLOW_ERROR;
1545 /* streaming operation:
1547 * accumulate data until we have a frame, then decode.
1549 static GstFlowReturn
1550 gst_dvdemux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
1552 GstDVDemux *dvdemux;
1554 GstClockTime timestamp;
1556 dvdemux = GST_DVDEMUX (parent);
1558 /* a discontinuity in the stream, we need to get rid of
1559 * accumulated data in the adapter and assume a new frame
1560 * starts after the discontinuity */
1561 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)))
1562 gst_adapter_clear (dvdemux->adapter);
1564 /* a timestamp always should be respected */
1565 timestamp = GST_BUFFER_TIMESTAMP (buffer);
1566 if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
1567 dvdemux->time_segment.position = timestamp;
1568 /* FIXME, adjust frame_offset and other counters */
1571 gst_adapter_push (dvdemux->adapter, buffer);
1573 /* Apparently dv_parse_header can read from the body of the frame
1574 * too, so it needs more than header_size bytes. Wacky!
1576 if (G_UNLIKELY (dvdemux->frame_len == -1)) {
1577 /* if we don't know the length of a frame, we assume it is
1578 * the NTSC_BUFFER length, as this is enough to figure out
1579 * if this is PAL or NTSC */
1580 dvdemux->frame_len = NTSC_BUFFER;
1583 /* and try to flush pending frames */
1584 ret = gst_dvdemux_flush (dvdemux);
1589 /* pull based operation.
1591 * Read header first to figure out the frame size. Then read
1592 * and decode full frames.
1595 gst_dvdemux_loop (GstPad * pad)
1598 GstDVDemux *dvdemux;
1599 GstBuffer *buffer = NULL;
1602 dvdemux = GST_DVDEMUX (gst_pad_get_parent (pad));
1604 if (G_UNLIKELY (g_atomic_int_get (&dvdemux->found_header) == 0)) {
1605 GST_DEBUG_OBJECT (dvdemux, "pulling first buffer");
1606 /* pull in NTSC sized buffer to figure out the frame
1608 ret = gst_pad_pull_range (dvdemux->sinkpad,
1609 dvdemux->byte_segment.position, NTSC_BUFFER, &buffer);
1610 if (G_UNLIKELY (ret != GST_FLOW_OK))
1613 /* check buffer size, don't want to read small buffers */
1614 if (G_UNLIKELY (gst_buffer_get_size (buffer) < NTSC_BUFFER))
1617 gst_buffer_map (buffer, &map, GST_MAP_READ);
1618 /* parse header to know the length and other params */
1619 if (G_UNLIKELY (dv_parse_header (dvdemux->decoder, map.data) < 0)) {
1620 gst_buffer_unmap (buffer, &map);
1621 goto parse_header_error;
1623 gst_buffer_unmap (buffer, &map);
1625 /* after parsing the header we know the length of the data */
1626 dvdemux->frame_len = dvdemux->decoder->frame_size;
1627 if (dvdemux->decoder->system == e_dv_system_625_50) {
1628 dvdemux->framerate_numerator = PAL_FRAMERATE_NUMERATOR;
1629 dvdemux->framerate_denominator = PAL_FRAMERATE_DENOMINATOR;
1631 dvdemux->framerate_numerator = NTSC_FRAMERATE_NUMERATOR;
1632 dvdemux->framerate_denominator = NTSC_FRAMERATE_DENOMINATOR;
1634 dvdemux->need_segment = TRUE;
1636 /* see if we need to read a larger part */
1637 if (dvdemux->frame_len != NTSC_BUFFER) {
1638 gst_buffer_unref (buffer);
1645 /* setting header and prrforming the seek must be atomic */
1646 GST_OBJECT_LOCK (dvdemux);
1647 /* got header now */
1648 g_atomic_int_set (&dvdemux->found_header, 1);
1650 /* now perform pending seek if any. */
1651 event = dvdemux->seek_event;
1653 gst_event_ref (event);
1654 GST_OBJECT_UNLOCK (dvdemux);
1657 if (!gst_dvdemux_handle_pull_seek (dvdemux, dvdemux->videosrcpad,
1659 GST_ELEMENT_WARNING (dvdemux, STREAM, DECODE, (NULL),
1660 ("Error perfoming initial seek"));
1662 gst_event_unref (event);
1664 /* and we need to pull a new buffer in all cases. */
1666 gst_buffer_unref (buffer);
1674 if (G_UNLIKELY (dvdemux->pending_segment)) {
1676 /* now send the newsegment */
1677 GST_DEBUG_OBJECT (dvdemux, "Sending newsegment from");
1679 gst_dvdemux_push_event (dvdemux, dvdemux->pending_segment);
1680 dvdemux->pending_segment = NULL;
1683 if (G_LIKELY (buffer == NULL)) {
1684 GST_DEBUG_OBJECT (dvdemux, "pulling buffer at offset %" G_GINT64_FORMAT,
1685 dvdemux->byte_segment.position);
1687 ret = gst_pad_pull_range (dvdemux->sinkpad,
1688 dvdemux->byte_segment.position, dvdemux->frame_len, &buffer);
1689 if (ret != GST_FLOW_OK)
1692 /* check buffer size, don't want to read small buffers */
1693 if (gst_buffer_get_size (buffer) < dvdemux->frame_len)
1696 /* and decode the buffer */
1697 ret = gst_dvdemux_demux_frame (dvdemux, buffer);
1698 if (G_UNLIKELY (ret != GST_FLOW_OK))
1701 /* and position ourselves for the next buffer */
1702 dvdemux->byte_segment.position += dvdemux->frame_len;
1705 gst_object_unref (dvdemux);
1712 GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
1713 (NULL), ("Error parsing DV header"));
1714 gst_buffer_unref (buffer);
1715 gst_pad_pause_task (dvdemux->sinkpad);
1716 gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
1721 GST_ELEMENT_ERROR (dvdemux, STREAM, DECODE,
1722 (NULL), ("Error reading buffer"));
1723 gst_buffer_unref (buffer);
1724 gst_pad_pause_task (dvdemux->sinkpad);
1725 gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
1730 GST_INFO_OBJECT (dvdemux, "pausing task, %s", gst_flow_get_name (ret));
1731 gst_pad_pause_task (dvdemux->sinkpad);
1732 if (ret == GST_FLOW_EOS) {
1733 GST_LOG_OBJECT (dvdemux, "got eos");
1734 /* so align our position with the end of it, if there is one
1735 * this ensures a subsequent will arrive at correct base/acc time */
1736 if (dvdemux->time_segment.rate > 0.0 &&
1737 GST_CLOCK_TIME_IS_VALID (dvdemux->time_segment.stop))
1738 dvdemux->time_segment.position = dvdemux->time_segment.stop;
1739 else if (dvdemux->time_segment.rate < 0.0)
1740 dvdemux->time_segment.position = dvdemux->time_segment.start;
1741 /* perform EOS logic */
1742 if (dvdemux->time_segment.flags & GST_SEEK_FLAG_SEGMENT) {
1743 gst_element_post_message (GST_ELEMENT (dvdemux),
1744 gst_message_new_segment_done (GST_OBJECT_CAST (dvdemux),
1745 dvdemux->time_segment.format, dvdemux->time_segment.position));
1746 gst_dvdemux_push_event (dvdemux,
1747 gst_event_new_segment_done (dvdemux->time_segment.format,
1748 dvdemux->time_segment.position));
1750 gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
1752 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
1753 /* for fatal errors or not-linked we post an error message */
1754 GST_ELEMENT_ERROR (dvdemux, STREAM, FAILED,
1755 (NULL), ("streaming stopped, reason %s", gst_flow_get_name (ret)));
1756 gst_dvdemux_push_event (dvdemux, gst_event_new_eos ());
1763 gst_dvdemux_sink_activate_mode (GstPad * sinkpad, GstObject * parent,
1764 GstPadMode mode, gboolean active)
1767 GstDVDemux *demux = GST_DVDEMUX (parent);
1770 case GST_PAD_MODE_PULL:
1772 demux->seek_handler = gst_dvdemux_handle_pull_seek;
1773 res = gst_pad_start_task (sinkpad,
1774 (GstTaskFunction) gst_dvdemux_loop, sinkpad, NULL);
1776 demux->seek_handler = NULL;
1777 res = gst_pad_stop_task (sinkpad);
1780 case GST_PAD_MODE_PUSH:
1782 GST_DEBUG_OBJECT (demux, "activating push/chain function");
1783 demux->seek_handler = gst_dvdemux_handle_push_seek;
1785 GST_DEBUG_OBJECT (demux, "deactivating push/chain function");
1786 demux->seek_handler = NULL;
1797 /* decide on push or pull based scheduling */
1799 gst_dvdemux_sink_activate (GstPad * sinkpad, GstObject * parent)
1804 query = gst_query_new_scheduling ();
1806 if (!gst_pad_peer_query (sinkpad, query)) {
1807 gst_query_unref (query);
1811 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
1812 gst_query_unref (query);
1817 GST_DEBUG_OBJECT (sinkpad, "activating pull");
1818 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
1822 GST_DEBUG_OBJECT (sinkpad, "activating push");
1823 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
1827 static GstStateChangeReturn
1828 gst_dvdemux_change_state (GstElement * element, GstStateChange transition)
1830 GstDVDemux *dvdemux = GST_DVDEMUX (element);
1831 GstStateChangeReturn ret;
1833 switch (transition) {
1834 case GST_STATE_CHANGE_NULL_TO_READY:
1836 case GST_STATE_CHANGE_READY_TO_PAUSED:
1837 dvdemux->decoder = dv_decoder_new (0, FALSE, FALSE);
1838 dv_set_error_log (dvdemux->decoder, NULL);
1839 gst_dvdemux_reset (dvdemux);
1841 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
1847 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1849 switch (transition) {
1850 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
1852 case GST_STATE_CHANGE_PAUSED_TO_READY:
1853 gst_adapter_clear (dvdemux->adapter);
1854 dv_decoder_free (dvdemux->decoder);
1855 dvdemux->decoder = NULL;
1857 gst_dvdemux_remove_pads (dvdemux);
1859 case GST_STATE_CHANGE_READY_TO_NULL:
1863 event_p = &dvdemux->seek_event;
1864 gst_event_replace (event_p, NULL);
1865 if (dvdemux->pending_segment)
1866 gst_event_unref (dvdemux->pending_segment);
1867 dvdemux->pending_segment = NULL;