2 * Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.com>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
28 #include <gst/rtp/gstrtpbuffer.h>
30 #include "gstrtph263ppay.h"
32 #define DEFAULT_FRAGMENTATION_MODE GST_FRAGMENTATION_MODE_NORMAL
37 PROP_FRAGMENTATION_MODE
40 #define GST_TYPE_FRAGMENTATION_MODE (gst_fragmentation_mode_get_type())
42 gst_fragmentation_mode_get_type (void)
44 static GType fragmentation_mode_type = 0;
45 static const GEnumValue fragmentation_mode[] = {
46 {GST_FRAGMENTATION_MODE_NORMAL, "Normal", "normal"},
47 {GST_FRAGMENTATION_MODE_SYNC, "Fragment at sync points", "sync"},
51 if (!fragmentation_mode_type) {
52 fragmentation_mode_type =
53 g_enum_register_static ("GstFragmentationMode", fragmentation_mode);
55 return fragmentation_mode_type;
59 GST_DEBUG_CATEGORY_STATIC (rtph263ppay_debug);
60 #define GST_CAT_DEFAULT rtph263ppay_debug
62 static GstStaticPadTemplate gst_rtp_h263p_pay_sink_template =
63 GST_STATIC_PAD_TEMPLATE ("sink",
66 GST_STATIC_CAPS ("video/x-h263, variant = (string) itu")
70 * We also return these in getcaps() as required by the SDP caps
72 * width = (int) [16, 4096]
73 * height = (int) [16, 4096]
74 * "annex-f = (boolean) {true, false},"
75 * "annex-i = (boolean) {true, false},"
76 * "annex-j = (boolean) {true, false},"
77 * "annex-l = (boolean) {true, false},"
78 * "annex-t = (boolean) {true, false},"
79 * "annex-v = (boolean) {true, false}")
83 static GstStaticPadTemplate gst_rtp_h263p_pay_src_template =
84 GST_STATIC_PAD_TEMPLATE ("src",
87 GST_STATIC_CAPS ("application/x-rtp, "
88 "media = (string) \"video\", "
89 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
90 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"; "
92 "media = (string) \"video\", "
93 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
94 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-2000\"")
97 static void gst_rtp_h263p_pay_finalize (GObject * object);
99 static void gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
100 const GValue * value, GParamSpec * pspec);
101 static void gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
102 GValue * value, GParamSpec * pspec);
104 static gboolean gst_rtp_h263p_pay_setcaps (GstRTPBasePayload * payload,
106 static GstCaps *gst_rtp_h263p_pay_sink_getcaps (GstRTPBasePayload * payload,
107 GstPad * pad, GstCaps * filter);
108 static GstFlowReturn gst_rtp_h263p_pay_handle_buffer (GstRTPBasePayload *
109 payload, GstBuffer * buffer);
111 #define gst_rtp_h263p_pay_parent_class parent_class
112 G_DEFINE_TYPE (GstRtpH263PPay, gst_rtp_h263p_pay, GST_TYPE_RTP_BASE_PAYLOAD);
115 gst_rtp_h263p_pay_class_init (GstRtpH263PPayClass * klass)
117 GObjectClass *gobject_class;
118 GstElementClass *gstelement_class;
119 GstRTPBasePayloadClass *gstrtpbasepayload_class;
121 gobject_class = (GObjectClass *) klass;
122 gstelement_class = (GstElementClass *) klass;
123 gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;
125 gobject_class->finalize = gst_rtp_h263p_pay_finalize;
126 gobject_class->set_property = gst_rtp_h263p_pay_set_property;
127 gobject_class->get_property = gst_rtp_h263p_pay_get_property;
129 gstrtpbasepayload_class->set_caps = gst_rtp_h263p_pay_setcaps;
130 gstrtpbasepayload_class->get_caps = gst_rtp_h263p_pay_sink_getcaps;
131 gstrtpbasepayload_class->handle_buffer = gst_rtp_h263p_pay_handle_buffer;
133 g_object_class_install_property (G_OBJECT_CLASS (klass),
134 PROP_FRAGMENTATION_MODE, g_param_spec_enum ("fragmentation-mode",
135 "Fragmentation Mode",
136 "Packet Fragmentation Mode", GST_TYPE_FRAGMENTATION_MODE,
137 DEFAULT_FRAGMENTATION_MODE,
138 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
140 gst_element_class_add_pad_template (gstelement_class,
141 gst_static_pad_template_get (&gst_rtp_h263p_pay_src_template));
142 gst_element_class_add_pad_template (gstelement_class,
143 gst_static_pad_template_get (&gst_rtp_h263p_pay_sink_template));
145 gst_element_class_set_static_metadata (gstelement_class, "RTP H263 payloader",
146 "Codec/Payloader/Network/RTP",
147 "Payload-encodes H263/+/++ video in RTP packets (RFC 4629)",
148 "Wim Taymans <wim.taymans@gmail.com>");
150 GST_DEBUG_CATEGORY_INIT (rtph263ppay_debug, "rtph263ppay",
151 0, "rtph263ppay (RFC 4629)");
155 gst_rtp_h263p_pay_init (GstRtpH263PPay * rtph263ppay)
157 rtph263ppay->adapter = gst_adapter_new ();
159 rtph263ppay->fragmentation_mode = DEFAULT_FRAGMENTATION_MODE;
163 gst_rtp_h263p_pay_finalize (GObject * object)
165 GstRtpH263PPay *rtph263ppay;
167 rtph263ppay = GST_RTP_H263P_PAY (object);
169 g_object_unref (rtph263ppay->adapter);
170 rtph263ppay->adapter = NULL;
172 G_OBJECT_CLASS (parent_class)->finalize (object);
176 gst_rtp_h263p_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
180 gchar *encoding_name = NULL;
182 g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
185 gst_pad_peer_query_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload), NULL);
187 GstCaps *intersect = gst_caps_intersect (peercaps,
188 gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload)));
190 gst_caps_unref (peercaps);
191 if (!gst_caps_is_empty (intersect)) {
192 GstStructure *s = gst_caps_get_structure (intersect, 0);
193 encoding_name = g_strdup (gst_structure_get_string (s, "encoding-name"));
195 gst_caps_unref (intersect);
199 encoding_name = g_strdup ("H263-1998");
201 gst_rtp_base_payload_set_options (payload, "video", TRUE,
202 (gchar *) encoding_name, 90000);
203 res = gst_rtp_base_payload_set_outcaps (payload, NULL);
204 g_free (encoding_name);
210 caps_append (GstCaps * caps, GstStructure * in_s, guint x, guint y, guint mpi)
217 if (mpi < 1 || mpi > 32)
220 s = gst_structure_copy (in_s);
222 gst_structure_set (s,
223 "width", GST_TYPE_INT_RANGE, 1, x,
224 "height", GST_TYPE_INT_RANGE, 1, y,
225 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 1001 * mpi, NULL);
227 caps = gst_caps_merge_structure (caps, s);
234 gst_rtp_h263p_pay_sink_getcaps (GstRTPBasePayload * payload, GstPad * pad,
237 GstRtpH263PPay *rtph263ppay;
238 GstCaps *caps = NULL, *templ;
239 GstCaps *peercaps = NULL;
240 GstCaps *intersect = NULL;
243 rtph263ppay = GST_RTP_H263P_PAY (payload);
246 gst_pad_peer_query_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload), filter);
248 /* if we're just outputting to udpsink or fakesink or so, we should also
249 * accept any input compatible with our sink template caps */
250 if (!peercaps || gst_caps_is_any (peercaps))
252 gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SINKPAD (payload));
254 /* We basically need to differentiate two use-cases here: One where there's
255 * a capsfilter after the payloader with caps created from an SDP; in this
256 * case the filter caps are fixed and we want to signal to an encoder what
257 * we want it to produce. The second case is simply payloader ! depayloader
258 * where we are dealing with the depayloader's template caps. In this case
259 * we should accept any input compatible with our sink template caps. */
260 if (!gst_caps_is_fixed (peercaps))
262 gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SINKPAD (payload));
264 templ = gst_pad_get_pad_template_caps (GST_RTP_BASE_PAYLOAD_SRCPAD (payload));
265 intersect = gst_caps_intersect (peercaps, templ);
266 gst_caps_unref (peercaps);
267 gst_caps_unref (templ);
269 if (gst_caps_is_empty (intersect))
272 caps = gst_caps_new_empty ();
273 for (i = 0; i < gst_caps_get_size (intersect); i++) {
274 GstStructure *s = gst_caps_get_structure (intersect, i);
275 const gchar *encoding_name = gst_structure_get_string (s, "encoding-name");
277 if (!strcmp (encoding_name, "H263-2000")) {
278 const gchar *profile_str = gst_structure_get_string (s, "profile");
279 const gchar *level_str = gst_structure_get_string (s, "level");
283 if (profile_str && level_str) {
284 gboolean i = FALSE, j = FALSE, l = FALSE, t = FALSE, f = FALSE,
286 GstStructure *new_s = gst_structure_new ("video/x-h263",
287 "variant", G_TYPE_STRING, "itu",
290 profile = atoi (profile_str);
291 level = atoi (level_str);
293 /* These profiles are defined in the H.263 Annex X */
296 /* The Baseline Profile (Profile 0) */
299 /* H.320 Coding Efficiency Version 2 Backward-Compatibility Profile
301 * Baseline + Annexes I, J, L.4 and T
303 i = j = l = t = TRUE;
306 /* Version 1 Backward-Compatibility Profile (Profile 2)
309 i = j = l = t = f = TRUE;
312 /* Version 2 Interactive and Streaming Wireless Profile
313 * Baseline + Annexes I, J, T
318 /* Version 3 Interactive and Streaming Wireless Profile (Profile 4)
319 * Baseline + Annexes I, J, T, V, W.6.3.8,
321 /* Missing W.6.3.8 */
322 i = j = t = v = TRUE;
325 /* Conversational High Compression Profile (Profile 5)
326 * Baseline + Annexes F, I, J, L.4, T, D, U
329 f = i = j = l = t = TRUE;
332 /* Conversational Internet Profile (Profile 6)
333 * Baseline + Annexes F, I, J, L.4, T, D, U and
334 * K with arbitratry slice ordering
336 /* Missing D, U, K with arbitratry slice ordering */
337 f = i = j = l = t = TRUE;
340 /* Conversational Interlace Profile (Profile 7)
341 * Baseline + Annexes F, I, J, L.4, T, D, U, W.6.3.11
343 /* Missing D, U, W.6.3.11 */
344 f = i = j = l = t = TRUE;
347 /* High Latency Profile (Profile 8)
348 * Baseline + Annexes F, I, J, L.4, T, D, U, P.5, O.1.1 and
349 * K with arbitratry slice ordering
351 /* Missing D, U, P.5, O.1.1 */
352 f = i = j = l = t = TRUE;
357 if (f || i || j || t || l || v) {
361 g_value_init (&list, GST_TYPE_LIST);
362 g_value_init (&vstr, G_TYPE_STRING);
364 g_value_set_static_string (&vstr, "h263");
365 gst_value_list_append_value (&list, &vstr);
366 g_value_set_static_string (&vstr, "h263p");
367 gst_value_list_append_value (&list, &vstr);
370 g_value_set_static_string (&vstr, "h263pp");
371 gst_value_list_append_value (&list, &vstr);
373 g_value_unset (&vstr);
375 gst_structure_set_value (new_s, "h263version", &list);
376 g_value_unset (&list);
378 gst_structure_set (new_s, "h263version", G_TYPE_STRING, "h263", NULL);
383 gst_structure_set (new_s, "annex-f", G_TYPE_BOOLEAN, FALSE, NULL);
385 gst_structure_set (new_s, "annex-i", G_TYPE_BOOLEAN, FALSE, NULL);
387 gst_structure_set (new_s, "annex-j", G_TYPE_BOOLEAN, FALSE, NULL);
389 gst_structure_set (new_s, "annex-t", G_TYPE_BOOLEAN, FALSE, NULL);
391 gst_structure_set (new_s, "annex-l", G_TYPE_BOOLEAN, FALSE, NULL);
393 gst_structure_set (new_s, "annex-v", G_TYPE_BOOLEAN, FALSE, NULL);
396 if (level <= 10 || level == 45) {
397 gst_structure_set (new_s,
398 "width", GST_TYPE_INT_RANGE, 1, 176,
399 "height", GST_TYPE_INT_RANGE, 1, 144,
400 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 2002, NULL);
401 caps = gst_caps_merge_structure (caps, new_s);
402 } else if (level <= 20) {
403 GstStructure *s_copy = gst_structure_copy (new_s);
405 gst_structure_set (new_s,
406 "width", GST_TYPE_INT_RANGE, 1, 352,
407 "height", GST_TYPE_INT_RANGE, 1, 288,
408 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 2002, NULL);
409 caps = gst_caps_merge_structure (caps, new_s);
411 gst_structure_set (s_copy,
412 "width", GST_TYPE_INT_RANGE, 1, 176,
413 "height", GST_TYPE_INT_RANGE, 1, 144,
414 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 1001, NULL);
415 caps = gst_caps_merge_structure (caps, s_copy);
416 } else if (level <= 40) {
418 gst_structure_set (new_s,
419 "width", GST_TYPE_INT_RANGE, 1, 352,
420 "height", GST_TYPE_INT_RANGE, 1, 288,
421 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 30000, 1001, NULL);
422 caps = gst_caps_merge_structure (caps, new_s);
423 } else if (level <= 50) {
424 GstStructure *s_copy = gst_structure_copy (new_s);
426 gst_structure_set (new_s,
427 "width", GST_TYPE_INT_RANGE, 1, 352,
428 "height", GST_TYPE_INT_RANGE, 1, 288,
429 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 50, 1, NULL);
430 caps = gst_caps_merge_structure (caps, new_s);
432 gst_structure_set (s_copy,
433 "width", GST_TYPE_INT_RANGE, 1, 352,
434 "height", GST_TYPE_INT_RANGE, 1, 240,
435 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 60000, 1001, NULL);
436 caps = gst_caps_merge_structure (caps, s_copy);
437 } else if (level <= 60) {
438 GstStructure *s_copy = gst_structure_copy (new_s);
440 gst_structure_set (new_s,
441 "width", GST_TYPE_INT_RANGE, 1, 720,
442 "height", GST_TYPE_INT_RANGE, 1, 288,
443 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 50, 1, NULL);
444 caps = gst_caps_merge_structure (caps, new_s);
446 gst_structure_set (s_copy,
447 "width", GST_TYPE_INT_RANGE, 1, 720,
448 "height", GST_TYPE_INT_RANGE, 1, 240,
449 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 60000, 1001, NULL);
450 caps = gst_caps_merge_structure (caps, s_copy);
451 } else if (level <= 70) {
452 GstStructure *s_copy = gst_structure_copy (new_s);
454 gst_structure_set (new_s,
455 "width", GST_TYPE_INT_RANGE, 1, 720,
456 "height", GST_TYPE_INT_RANGE, 1, 576,
457 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 50, 1, NULL);
458 caps = gst_caps_merge_structure (caps, new_s);
460 gst_structure_set (s_copy,
461 "width", GST_TYPE_INT_RANGE, 1, 720,
462 "height", GST_TYPE_INT_RANGE, 1, 480,
463 "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 60000, 1001, NULL);
464 caps = gst_caps_merge_structure (caps, s_copy);
466 caps = gst_caps_merge_structure (caps, new_s);
470 GstStructure *new_s = gst_structure_new ("video/x-h263",
471 "variant", G_TYPE_STRING, "itu",
472 "h263version", G_TYPE_STRING, "h263",
475 GST_DEBUG_OBJECT (rtph263ppay, "No profile or level specified"
476 " for H263-2000, defaulting to baseline H263");
478 caps = gst_caps_merge_structure (caps, new_s);
481 gboolean f = FALSE, i = FALSE, j = FALSE, t = FALSE;
482 /* FIXME: ffmpeg support the Appendix K too, how do we express it ?
486 GstStructure *new_s = gst_structure_new ("video/x-h263",
487 "variant", G_TYPE_STRING, "itu",
489 gboolean added = FALSE;
491 str = gst_structure_get_string (s, "f");
492 if (str && !strcmp (str, "1"))
495 str = gst_structure_get_string (s, "i");
496 if (str && !strcmp (str, "1"))
499 str = gst_structure_get_string (s, "j");
500 if (str && !strcmp (str, "1"))
503 str = gst_structure_get_string (s, "t");
504 if (str && !strcmp (str, "1"))
507 if (f || i || j || t) {
511 g_value_init (&list, GST_TYPE_LIST);
512 g_value_init (&vstr, G_TYPE_STRING);
514 g_value_set_static_string (&vstr, "h263");
515 gst_value_list_append_value (&list, &vstr);
516 g_value_set_static_string (&vstr, "h263p");
517 gst_value_list_append_value (&list, &vstr);
518 g_value_unset (&vstr);
520 gst_structure_set_value (new_s, "h263version", &list);
521 g_value_unset (&list);
523 gst_structure_set (new_s, "h263version", G_TYPE_STRING, "h263", NULL);
527 gst_structure_set (new_s, "annex-f", G_TYPE_BOOLEAN, FALSE, NULL);
529 gst_structure_set (new_s, "annex-i", G_TYPE_BOOLEAN, FALSE, NULL);
531 gst_structure_set (new_s, "annex-j", G_TYPE_BOOLEAN, FALSE, NULL);
533 gst_structure_set (new_s, "annex-t", G_TYPE_BOOLEAN, FALSE, NULL);
536 str = gst_structure_get_string (s, "custom");
538 unsigned int xmax, ymax, mpi;
539 if (sscanf (str, "%u,%u,%u", &xmax, &ymax, &mpi) == 3) {
540 if (xmax % 4 && ymax % 4 && mpi >= 1 && mpi <= 32) {
541 caps = caps_append (caps, new_s, xmax, ymax, mpi);
544 GST_WARNING_OBJECT (rtph263ppay, "Invalid custom framesize/MPI"
545 " %u x %u at %u, ignoring", xmax, ymax, mpi);
548 GST_WARNING_OBJECT (rtph263ppay, "Invalid custom framesize/MPI: %s,"
553 str = gst_structure_get_string (s, "16cif");
555 int mpi = atoi (str);
556 caps = caps_append (caps, new_s, 1408, 1152, mpi);
560 str = gst_structure_get_string (s, "4cif");
562 int mpi = atoi (str);
563 caps = caps_append (caps, new_s, 704, 576, mpi);
567 str = gst_structure_get_string (s, "cif");
569 int mpi = atoi (str);
570 caps = caps_append (caps, new_s, 352, 288, mpi);
574 str = gst_structure_get_string (s, "qcif");
576 int mpi = atoi (str);
577 caps = caps_append (caps, new_s, 176, 144, mpi);
581 str = gst_structure_get_string (s, "sqcif");
583 int mpi = atoi (str);
584 caps = caps_append (caps, new_s, 128, 96, mpi);
589 gst_structure_free (new_s);
591 caps = gst_caps_merge_structure (caps, new_s);
595 gst_caps_unref (intersect);
602 gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
603 const GValue * value, GParamSpec * pspec)
605 GstRtpH263PPay *rtph263ppay;
607 rtph263ppay = GST_RTP_H263P_PAY (object);
610 case PROP_FRAGMENTATION_MODE:
611 rtph263ppay->fragmentation_mode = g_value_get_enum (value);
614 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
620 gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
621 GValue * value, GParamSpec * pspec)
623 GstRtpH263PPay *rtph263ppay;
625 rtph263ppay = GST_RTP_H263P_PAY (object);
628 case PROP_FRAGMENTATION_MODE:
629 g_value_set_enum (value, rtph263ppay->fragmentation_mode);
632 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
638 gst_rtp_h263p_pay_flush (GstRtpH263PPay * rtph263ppay)
645 avail = gst_adapter_available (rtph263ppay->adapter);
650 /* This algorithm assumes the H263/+/++ encoder sends complete frames in each
652 /* With Fragmentation Mode at GST_FRAGMENTATION_MODE_NORMAL:
653 * This algorithm implements the Follow-on packets method for packetization.
654 * This assumes low packet loss network.
655 * With Fragmentation Mode at GST_FRAGMENTATION_MODE_SYNC:
656 * This algorithm separates large frames at synchronisation points (Segments)
657 * (See RFC 4629 section 6). It would be interesting to have a property such as network
658 * quality to select between both packetization methods */
659 /* TODO Add VRC supprt (See RFC 4629 section 5.2) */
667 gboolean found_gob = FALSE;
668 GstRTPBuffer rtp = { NULL };
670 if (rtph263ppay->fragmentation_mode == GST_FRAGMENTATION_MODE_SYNC) {
671 /* start after 1st gop possible */
672 guint parsed_len = 3;
673 const guint8 *parse_data = NULL;
675 parse_data = gst_adapter_map (rtph263ppay->adapter, avail);
677 /* Check if we have a gob or eos , eossbs */
678 /* FIXME EOS and EOSSBS packets should never contain any gobs and vice-versa */
679 if (avail >= 3 && *parse_data == 0 && *(parse_data + 1) == 0
680 && *(parse_data + 2) >= 0x80) {
681 GST_DEBUG_OBJECT (rtph263ppay, " Found GOB header");
684 /* Find next and cut the packet accordingly */
685 /* TODO we should get as many gobs as possible until MTU is reached, this
686 * code seems to just get one GOB per packet */
687 while (parsed_len + 2 < avail) {
688 if (parse_data[parsed_len] == 0 && parse_data[parsed_len + 1] == 0
689 && parse_data[parsed_len + 2] >= 0x80) {
690 next_gop = parsed_len;
691 GST_DEBUG_OBJECT (rtph263ppay, " Next GOB Detected at : %d",
697 gst_adapter_unmap (rtph263ppay->adapter);
700 /* for picture start frames (non-fragmented), we need to remove the first
701 * two 0x00 bytes and set P=1 */
702 header_len = (fragmented && !found_gob) ? 2 : 0;
704 towrite = MIN (avail, gst_rtp_buffer_calc_payload_len
705 (GST_RTP_BASE_PAYLOAD_MTU (rtph263ppay) - header_len, 0, 0));
708 towrite = MIN (next_gop, towrite);
710 payload_len = header_len + towrite;
712 outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
714 gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
715 /* last fragment gets the marker bit set */
716 gst_rtp_buffer_set_marker (&rtp, avail > towrite ? 0 : 1);
718 payload = gst_rtp_buffer_get_payload (&rtp);
720 gst_adapter_copy (rtph263ppay->adapter, &payload[header_len], 0, towrite);
723 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
724 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
725 * | RR |P|V| PLEN |PEBIT|
726 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
728 /* if fragmented or gop header , write p bit =1 */
729 payload[0] = (fragmented && !found_gob) ? 0x00 : 0x04;
732 GST_BUFFER_TIMESTAMP (outbuf) = rtph263ppay->first_timestamp;
733 GST_BUFFER_DURATION (outbuf) = rtph263ppay->first_duration;
734 gst_rtp_buffer_unmap (&rtp);
736 gst_adapter_flush (rtph263ppay->adapter, towrite);
739 gst_rtp_base_payload_push (GST_RTP_BASE_PAYLOAD (rtph263ppay), outbuf);
749 gst_rtp_h263p_pay_handle_buffer (GstRTPBasePayload * payload,
752 GstRtpH263PPay *rtph263ppay;
755 rtph263ppay = GST_RTP_H263P_PAY (payload);
757 rtph263ppay->first_timestamp = GST_BUFFER_TIMESTAMP (buffer);
758 rtph263ppay->first_duration = GST_BUFFER_DURATION (buffer);
760 /* we always encode and flush a full picture */
761 gst_adapter_push (rtph263ppay->adapter, buffer);
762 ret = gst_rtp_h263p_pay_flush (rtph263ppay);
768 gst_rtp_h263p_pay_plugin_init (GstPlugin * plugin)
770 return gst_element_register (plugin, "rtph263ppay",
771 GST_RANK_SECONDARY, GST_TYPE_RTP_H263P_PAY);