2 * Copyright (C) <2006> 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., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
27 #include <gst/base/gstbitreader.h>
28 #include <gst/rtp/gstrtpbuffer.h>
29 #include <gst/pbutils/pbutils.h>
30 #include <gst/video/video.h>
31 #include "gstrtph264depay.h"
32 #include "gstrtputils.h"
34 GST_DEBUG_CATEGORY_STATIC (rtph264depay_debug);
35 #define GST_CAT_DEFAULT (rtph264depay_debug)
37 /* This is what we'll default to when downstream hasn't
38 * expressed a restriction or preference via caps */
39 #define DEFAULT_BYTE_STREAM TRUE
40 #define DEFAULT_ACCESS_UNIT FALSE
42 /* 3 zero bytes syncword */
43 static const guint8 sync_bytes[] = { 0, 0, 0, 1 };
45 static GstStaticPadTemplate gst_rtp_h264_depay_src_template =
46 GST_STATIC_PAD_TEMPLATE ("src",
49 GST_STATIC_CAPS ("video/x-h264, "
50 "stream-format = (string) avc, alignment = (string) au; "
52 "stream-format = (string) byte-stream, alignment = (string) { nal, au }")
55 static GstStaticPadTemplate gst_rtp_h264_depay_sink_template =
56 GST_STATIC_PAD_TEMPLATE ("sink",
59 GST_STATIC_CAPS ("application/x-rtp, "
60 "media = (string) \"video\", "
61 "clock-rate = (int) 90000, " "encoding-name = (string) \"H264\"")
62 /** optional parameters **/
63 /* "profile-level-id = (string) ANY, " */
64 /* "max-mbps = (string) ANY, " */
65 /* "max-fs = (string) ANY, " */
66 /* "max-cpb = (string) ANY, " */
67 /* "max-dpb = (string) ANY, " */
68 /* "max-br = (string) ANY, " */
69 /* "redundant-pic-cap = (string) { \"0\", \"1\" }, " */
70 /* "sprop-parameter-sets = (string) ANY, " */
71 /* "parameter-add = (string) { \"0\", \"1\" }, " */
72 /* "packetization-mode = (string) { \"0\", \"1\", \"2\" }, " */
73 /* "sprop-interleaving-depth = (string) ANY, " */
74 /* "sprop-deint-buf-req = (string) ANY, " */
75 /* "deint-buf-cap = (string) ANY, " */
76 /* "sprop-init-buf-time = (string) ANY, " */
77 /* "sprop-max-don-diff = (string) ANY, " */
78 /* "max-rcmd-nalu-size = (string) ANY " */
81 #define gst_rtp_h264_depay_parent_class parent_class
82 G_DEFINE_TYPE (GstRtpH264Depay, gst_rtp_h264_depay,
83 GST_TYPE_RTP_BASE_DEPAYLOAD);
85 static void gst_rtp_h264_depay_finalize (GObject * object);
87 static GstStateChangeReturn gst_rtp_h264_depay_change_state (GstElement *
88 element, GstStateChange transition);
90 static GstBuffer *gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload,
92 static gboolean gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * filter,
94 static gboolean gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay,
98 gst_rtp_h264_depay_class_init (GstRtpH264DepayClass * klass)
100 GObjectClass *gobject_class;
101 GstElementClass *gstelement_class;
102 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
104 gobject_class = (GObjectClass *) klass;
105 gstelement_class = (GstElementClass *) klass;
106 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
108 gobject_class->finalize = gst_rtp_h264_depay_finalize;
110 gst_element_class_add_static_pad_template (gstelement_class,
111 &gst_rtp_h264_depay_src_template);
112 gst_element_class_add_static_pad_template (gstelement_class,
113 &gst_rtp_h264_depay_sink_template);
115 gst_element_class_set_static_metadata (gstelement_class,
116 "RTP H264 depayloader", "Codec/Depayloader/Network/RTP",
117 "Extracts H264 video from RTP packets (RFC 3984)",
118 "Wim Taymans <wim.taymans@gmail.com>");
119 gstelement_class->change_state = gst_rtp_h264_depay_change_state;
121 gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_h264_depay_process;
122 gstrtpbasedepayload_class->set_caps = gst_rtp_h264_depay_setcaps;
123 gstrtpbasedepayload_class->handle_event = gst_rtp_h264_depay_handle_event;
127 gst_rtp_h264_depay_init (GstRtpH264Depay * rtph264depay)
129 rtph264depay->adapter = gst_adapter_new ();
130 rtph264depay->picture_adapter = gst_adapter_new ();
131 rtph264depay->byte_stream = DEFAULT_BYTE_STREAM;
132 rtph264depay->merge = DEFAULT_ACCESS_UNIT;
133 rtph264depay->sps = g_ptr_array_new_with_free_func (
134 (GDestroyNotify) gst_buffer_unref);
135 rtph264depay->pps = g_ptr_array_new_with_free_func (
136 (GDestroyNotify) gst_buffer_unref);
140 gst_rtp_h264_depay_reset (GstRtpH264Depay * rtph264depay)
142 gst_adapter_clear (rtph264depay->adapter);
143 rtph264depay->wait_start = TRUE;
144 gst_adapter_clear (rtph264depay->picture_adapter);
145 rtph264depay->picture_start = FALSE;
146 rtph264depay->last_keyframe = FALSE;
147 rtph264depay->last_ts = 0;
148 rtph264depay->current_fu_type = 0;
149 rtph264depay->new_codec_data = FALSE;
150 g_ptr_array_set_size (rtph264depay->sps, 0);
151 g_ptr_array_set_size (rtph264depay->pps, 0);
155 gst_rtp_h264_depay_finalize (GObject * object)
157 GstRtpH264Depay *rtph264depay;
159 rtph264depay = GST_RTP_H264_DEPAY (object);
161 if (rtph264depay->codec_data)
162 gst_buffer_unref (rtph264depay->codec_data);
164 g_object_unref (rtph264depay->adapter);
165 g_object_unref (rtph264depay->picture_adapter);
167 g_ptr_array_free (rtph264depay->sps, TRUE);
168 g_ptr_array_free (rtph264depay->pps, TRUE);
170 G_OBJECT_CLASS (parent_class)->finalize (object);
174 gst_rtp_h264_depay_negotiate (GstRtpH264Depay * rtph264depay)
177 gint byte_stream = -1;
181 gst_pad_get_allowed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay));
183 GST_DEBUG_OBJECT (rtph264depay, "allowed caps: %" GST_PTR_FORMAT, caps);
186 if (gst_caps_get_size (caps) > 0) {
187 GstStructure *s = gst_caps_get_structure (caps, 0);
188 const gchar *str = NULL;
190 if ((str = gst_structure_get_string (s, "stream-format"))) {
191 if (strcmp (str, "avc") == 0) {
193 } else if (strcmp (str, "byte-stream") == 0) {
196 GST_DEBUG_OBJECT (rtph264depay, "unknown stream-format: %s", str);
200 if ((str = gst_structure_get_string (s, "alignment"))) {
201 if (strcmp (str, "au") == 0) {
203 } else if (strcmp (str, "nal") == 0) {
206 GST_DEBUG_OBJECT (rtph264depay, "unknown alignment: %s", str);
210 gst_caps_unref (caps);
213 if (byte_stream != -1) {
214 GST_DEBUG_OBJECT (rtph264depay, "downstream requires byte-stream %d",
216 rtph264depay->byte_stream = byte_stream;
218 GST_DEBUG_OBJECT (rtph264depay, "defaulting to byte-stream %d",
219 DEFAULT_BYTE_STREAM);
220 rtph264depay->byte_stream = DEFAULT_BYTE_STREAM;
223 GST_DEBUG_OBJECT (rtph264depay, "downstream requires merge %d", merge);
224 rtph264depay->merge = merge;
226 GST_DEBUG_OBJECT (rtph264depay, "defaulting to merge %d",
227 DEFAULT_ACCESS_UNIT);
228 rtph264depay->merge = DEFAULT_ACCESS_UNIT;
233 parse_sps (GstMapInfo * map, guint32 * sps_id)
235 GstBitReader br = GST_BIT_READER_INIT (map->data + 4,
241 if (!gst_rtp_read_golomb (&br, sps_id))
248 parse_pps (GstMapInfo * map, guint32 * sps_id, guint32 * pps_id)
250 GstBitReader br = GST_BIT_READER_INIT (map->data + 1,
256 if (!gst_rtp_read_golomb (&br, pps_id))
258 if (!gst_rtp_read_golomb (&br, sps_id))
266 gst_rtp_h264_set_src_caps (GstRtpH264Depay * rtph264depay)
272 if (!rtph264depay->byte_stream &&
273 (!rtph264depay->new_codec_data ||
274 rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0))
277 srccaps = gst_caps_new_simple ("video/x-h264",
278 "stream-format", G_TYPE_STRING,
279 rtph264depay->byte_stream ? "byte-stream" : "avc",
280 "alignment", G_TYPE_STRING, rtph264depay->merge ? "au" : "nal", NULL);
282 if (!rtph264depay->byte_stream) {
283 GstBuffer *codec_data;
291 guchar profile_compat = G_MAXUINT8;
293 /* start with 7 bytes header */
295 /* count sps & pps */
296 for (i = 0; i < rtph264depay->sps->len; i++)
297 len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->sps, i));
298 for (i = 0; i < rtph264depay->pps->len; i++)
299 len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->pps, i));
301 codec_data = gst_buffer_new_and_alloc (len);
302 g_debug ("alloc_len: %u", len);
303 gst_buffer_map (codec_data, &map, GST_MAP_READWRITE);
306 /* 8 bits version == 1 */
309 /* According to: ISO/IEC 14496-15:2004(E) section 5.2.4.1
310 * The level is the max level of all SPSes
311 * A profile compat bit can only be set if all SPSes include that bit
313 for (i = 0; i < rtph264depay->sps->len; i++) {
314 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
316 profile_compat &= nalmap.data[2];
317 level = MAX (level, nalmap.data[3]);
318 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
321 /* Assume all SPSes use the same profile, so extract from the first SPS */
322 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, 0), &nalmap,
324 *data++ = nalmap.data[1];
325 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, 0), &nalmap);
326 *data++ = profile_compat;
329 /* 6 bits reserved | 2 bits lengthSizeMinusOn */
331 /* 3 bits reserved | 5 bits numOfSequenceParameterSets */
332 *data++ = 0xe0 | (rtph264depay->sps->len & 0x1f);
335 for (i = 0; i < rtph264depay->sps->len; i++) {
336 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
339 GST_DEBUG_OBJECT (rtph264depay, "copy SPS %d of length %u", i,
340 (guint) nalmap.size);
341 GST_WRITE_UINT16_BE (data, nalmap.size);
343 memcpy (data, nalmap.data, nalmap.size);
345 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
348 /* 8 bits numOfPictureParameterSets */
349 *data++ = rtph264depay->pps->len;
351 for (i = 0; i < rtph264depay->pps->len; i++) {
352 gst_buffer_map (g_ptr_array_index (rtph264depay->pps, i), &nalmap,
355 GST_DEBUG_OBJECT (rtph264depay, "copy PPS %d of length %u", i,
356 (guint) nalmap.size);
357 GST_WRITE_UINT16_BE (data, nalmap.size);
359 memcpy (data, nalmap.data, nalmap.size);
361 gst_buffer_unmap (g_ptr_array_index (rtph264depay->pps, i), &nalmap);
364 new_size = data - map.data;
365 gst_buffer_unmap (codec_data, &map);
366 gst_buffer_set_size (codec_data, new_size);
368 gst_caps_set_simple (srccaps,
369 "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
370 gst_buffer_unref (codec_data);
373 /* Set profile a level from SPS */
376 GstBuffer *max_level_sps = NULL;
380 /* Get the SPS with the highest level. We assume
381 * all SPS have the same profile */
382 for (i = 0; i < rtph264depay->sps->len; i++) {
383 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
385 if (level == 0 || level < nalmap.data[3]) {
386 max_level_sps = g_ptr_array_index (rtph264depay->sps, i);
387 level = nalmap.data[3];
389 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
393 gst_buffer_map (max_level_sps, &nalmap, GST_MAP_READ);
394 gst_codec_utils_h264_caps_set_level_and_profile (srccaps, nalmap.data + 1,
396 gst_buffer_unmap (max_level_sps, &nalmap);
402 gst_pad_get_current_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay));
404 if (old_caps != NULL) {
405 /* Only update the caps if they are not equal. For
406 * AVC we don't update caps if only the codec_data
407 * changes. This is the same behaviour as in h264parse
409 if (rtph264depay->byte_stream) {
410 if (!gst_caps_is_equal (srccaps, old_caps))
412 gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
417 GstCaps *tmp_caps = gst_caps_copy (srccaps);
418 GstStructure *old_s, *tmp_s;
420 old_s = gst_caps_get_structure (old_caps, 0);
421 tmp_s = gst_caps_get_structure (tmp_caps, 0);
422 if (gst_structure_has_field (old_s, "codec_data"))
423 gst_structure_set_value (tmp_s, "codec_data",
424 gst_structure_get_value (old_s, "codec_data"));
426 if (!gst_caps_is_equal (old_caps, tmp_caps))
428 gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
433 gst_caps_unref (tmp_caps);
437 gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
441 gst_caps_unref (srccaps);
443 /* Insert SPS and PPS into the stream on next opportunity */
444 if (rtph264depay->sps->len > 0 || rtph264depay->pps->len > 0) {
446 GstBuffer *codec_data;
451 for (i = 0; i < rtph264depay->sps->len; i++) {
452 len += 4 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->sps, i));
455 for (i = 0; i < rtph264depay->pps->len; i++) {
456 len += 4 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->pps, i));
459 codec_data = gst_buffer_new_and_alloc (len);
460 gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
463 for (i = 0; i < rtph264depay->sps->len; i++) {
464 GstBuffer *sps_buf = g_ptr_array_index (rtph264depay->sps, i);
465 guint sps_size = gst_buffer_get_size (sps_buf);
467 if (rtph264depay->byte_stream)
468 memcpy (data, sync_bytes, sizeof (sync_bytes));
470 GST_WRITE_UINT32_BE (data, sps_size);
471 gst_buffer_extract (sps_buf, 0, data + 4, -1);
472 data += 4 + sps_size;
475 for (i = 0; i < rtph264depay->pps->len; i++) {
476 GstBuffer *pps_buf = g_ptr_array_index (rtph264depay->pps, i);
477 guint pps_size = gst_buffer_get_size (pps_buf);
479 if (rtph264depay->byte_stream)
480 memcpy (data, sync_bytes, sizeof (sync_bytes));
482 GST_WRITE_UINT32_BE (data, pps_size);
483 gst_buffer_extract (pps_buf, 0, data + 4, -1);
484 data += 4 + pps_size;
487 gst_buffer_unmap (codec_data, &map);
488 if (rtph264depay->codec_data)
489 gst_buffer_unref (rtph264depay->codec_data);
490 rtph264depay->codec_data = codec_data;
494 rtph264depay->new_codec_data = FALSE;
500 gst_rtp_h264_add_sps_pps (GstElement * rtph264, GPtrArray * sps_array,
501 GPtrArray * pps_array, GstBuffer * nal)
507 gst_buffer_map (nal, &map, GST_MAP_READ);
509 type = map.data[0] & 0x1f;
514 if (!parse_sps (&map, &sps_id)) {
515 GST_WARNING_OBJECT (rtph264, "Invalid SPS,"
516 " can't parse seq_parameter_set_id");
520 for (i = 0; i < sps_array->len; i++) {
521 GstBuffer *sps = g_ptr_array_index (sps_array, i);
525 gst_buffer_map (sps, &spsmap, GST_MAP_READ);
526 parse_sps (&spsmap, &tmp_sps_id);
528 if (sps_id == tmp_sps_id) {
529 if (map.size == spsmap.size &&
530 memcmp (map.data, spsmap.data, spsmap.size) == 0) {
531 GST_LOG_OBJECT (rtph264, "Unchanged SPS %u, not updating", sps_id);
532 gst_buffer_unmap (sps, &spsmap);
535 gst_buffer_unmap (sps, &spsmap);
536 g_ptr_array_remove_index_fast (sps_array, i);
537 g_ptr_array_add (sps_array, nal);
538 GST_LOG_OBJECT (rtph264, "Modified SPS %u, replacing", sps_id);
542 gst_buffer_unmap (sps, &spsmap);
544 GST_LOG_OBJECT (rtph264, "Adding new SPS %u", sps_id);
545 g_ptr_array_add (sps_array, nal);
546 } else if (type == 8) {
550 if (!parse_pps (&map, &sps_id, &pps_id)) {
551 GST_WARNING_OBJECT (rtph264, "Invalid PPS,"
552 " can't parse seq_parameter_set_id or pic_parameter_set_id");
556 for (i = 0; i < pps_array->len; i++) {
557 GstBuffer *pps = g_ptr_array_index (pps_array, i);
563 gst_buffer_map (pps, &ppsmap, GST_MAP_READ);
564 parse_pps (&ppsmap, &tmp_sps_id, &tmp_pps_id);
566 if (pps_id == tmp_pps_id) {
567 if (map.size == ppsmap.size &&
568 memcmp (map.data, ppsmap.data, ppsmap.size) == 0) {
569 GST_LOG_OBJECT (rtph264, "Unchanged PPS %u:%u, not updating", sps_id,
571 gst_buffer_unmap (pps, &ppsmap);
574 gst_buffer_unmap (pps, &ppsmap);
575 g_ptr_array_remove_index_fast (pps_array, i);
576 g_ptr_array_add (pps_array, nal);
577 GST_LOG_OBJECT (rtph264, "Modified PPS %u:%u, replacing",
582 gst_buffer_unmap (pps, &ppsmap);
584 GST_LOG_OBJECT (rtph264, "Adding new PPS %u:%i", sps_id, pps_id);
585 g_ptr_array_add (pps_array, nal);
591 gst_buffer_unmap (nal, &map);
596 gst_buffer_unmap (nal, &map);
597 gst_buffer_unref (nal);
604 gst_rtp_h264_depay_add_sps_pps (GstRtpH264Depay * rtph264depay, GstBuffer * nal)
606 if (gst_rtp_h264_add_sps_pps (GST_ELEMENT (rtph264depay),
607 rtph264depay->sps, rtph264depay->pps, nal))
608 rtph264depay->new_codec_data = TRUE;
612 gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
615 GstStructure *structure = gst_caps_get_structure (caps, 0);
616 GstRtpH264Depay *rtph264depay;
618 GstBuffer *codec_data;
622 rtph264depay = GST_RTP_H264_DEPAY (depayload);
624 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
626 depayload->clock_rate = clock_rate;
628 /* Base64 encoded, comma separated config NALs */
629 ps = gst_structure_get_string (structure, "sprop-parameter-sets");
631 /* negotiate with downstream w.r.t. output format and alignment */
632 gst_rtp_h264_depay_negotiate (rtph264depay);
634 if (rtph264depay->byte_stream && ps != NULL) {
635 /* for bytestream we only need the parameter sets but we don't error out
636 * when they are not there, we assume they are in the stream. */
641 params = g_strsplit (ps, ",", 0);
643 /* count total number of bytes in base64. Also include the sync bytes in
644 * front of the params. */
646 for (i = 0; params[i]; i++) {
647 len += strlen (params[i]);
648 len += sizeof (sync_bytes);
650 /* we seriously overshoot the length, but it's fine. */
651 codec_data = gst_buffer_new_and_alloc (len);
653 gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
656 for (i = 0; params[i]; i++) {
660 GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
661 memcpy (ptr, sync_bytes, sizeof (sync_bytes));
662 ptr += sizeof (sync_bytes);
664 g_base64_decode_step (params[i], strlen (params[i]), ptr, &state,
666 GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
667 total += len + sizeof (sync_bytes);
670 gst_buffer_unmap (codec_data, &map);
671 gst_buffer_resize (codec_data, 0, total);
674 /* keep the codec_data, we need to send it as the first buffer. We cannot
675 * push it in the adapter because the adapter might be flushed on discont.
677 if (rtph264depay->codec_data)
678 gst_buffer_unref (rtph264depay->codec_data);
679 rtph264depay->codec_data = codec_data;
680 } else if (!rtph264depay->byte_stream) {
685 goto incomplete_caps;
687 params = g_strsplit (ps, ",", 0);
689 GST_DEBUG_OBJECT (depayload, "we have %d params", g_strv_length (params));
691 /* start with 7 bytes header */
692 for (i = 0; params[i]; i++) {
699 nal_len = strlen (params[i]);
700 nal = gst_buffer_new_and_alloc (nal_len);
701 gst_buffer_map (nal, &nalmap, GST_MAP_READWRITE);
704 g_base64_decode_step (params[i], nal_len, nalmap.data, &state, &save);
706 GST_DEBUG_OBJECT (depayload, "adding param %d as %s", i,
707 ((nalmap.data[0] & 0x1f) == 7) ? "SPS" : "PPS");
709 gst_buffer_unmap (nal, &nalmap);
710 gst_buffer_set_size (nal, nal_len);
712 gst_rtp_h264_depay_add_sps_pps (rtph264depay, nal);
716 if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0)
717 goto incomplete_caps;
720 return gst_rtp_h264_set_src_caps (rtph264depay);
725 GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
726 " doing setcaps later");
732 gst_rtp_h264_complete_au (GstRtpH264Depay * rtph264depay,
733 GstClockTime * out_timestamp, gboolean * out_keyframe)
738 /* we had a picture in the adapter and we completed it */
739 GST_DEBUG_OBJECT (rtph264depay, "taking completed AU");
740 outsize = gst_adapter_available (rtph264depay->picture_adapter);
741 outbuf = gst_adapter_take_buffer (rtph264depay->picture_adapter, outsize);
743 *out_timestamp = rtph264depay->last_ts;
744 *out_keyframe = rtph264depay->last_keyframe;
746 rtph264depay->last_keyframe = FALSE;
747 rtph264depay->picture_start = FALSE;
752 /* SPS/PPS/IDR considered key, all others DELTA;
753 * so downstream waiting for keyframe can pick up at SPS/PPS/IDR */
754 #define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8))
757 gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
758 GstClockTime in_timestamp, gboolean marker)
760 GstRTPBaseDepayload *depayload = GST_RTP_BASE_DEPAYLOAD (rtph264depay);
763 GstBuffer *outbuf = NULL;
764 GstClockTime out_timestamp;
765 gboolean keyframe, out_keyframe;
767 gst_buffer_map (nal, &map, GST_MAP_READ);
768 if (G_UNLIKELY (map.size < 5))
771 nal_type = map.data[4] & 0x1f;
772 GST_DEBUG_OBJECT (rtph264depay, "handle NAL type %d", nal_type);
774 keyframe = NAL_TYPE_IS_KEY (nal_type);
776 out_keyframe = keyframe;
777 out_timestamp = in_timestamp;
779 if (!rtph264depay->byte_stream) {
780 if (nal_type == 7 || nal_type == 8) {
781 gst_rtp_h264_depay_add_sps_pps (rtph264depay,
782 gst_buffer_copy_region (nal, GST_BUFFER_COPY_ALL,
783 4, gst_buffer_get_size (nal) - 4));
784 gst_buffer_unmap (nal, &map);
785 gst_buffer_unref (nal);
787 } else if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0) {
788 /* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
791 gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
792 gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
793 gst_structure_new ("GstForceKeyUnit",
794 "all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
795 gst_buffer_unmap (nal, &map);
796 gst_buffer_unref (nal);
800 if (rtph264depay->new_codec_data &&
801 rtph264depay->sps->len > 0 && rtph264depay->pps->len > 0)
802 gst_rtp_h264_set_src_caps (rtph264depay);
806 if (rtph264depay->merge) {
807 gboolean start = FALSE, complete = FALSE;
809 /* marker bit isn't mandatory so in the following code we try to guess
810 * an AU boundary by detecting a new picture start */
812 /* consider a coded slices (IDR or not) to start a picture,
813 * (so ending the previous one) if first_mb_in_slice == 0
814 * (non-0 is part of previous one) */
815 /* NOTE this is not entirely according to Access Unit specs in 7.4.1.2.4,
816 * but in practice it works in sane cases, needs not much parsing,
817 * and also works with broken frame_num in NAL (where spec-wise would fail) */
818 /* FIXME: this code isn't correct for interlaced content as AUs should be
819 * constructed with pairs of fields and the guess here will just push out
820 * AUs with a single field in it */
821 if (nal_type == 1 || nal_type == 2 || nal_type == 5) {
822 /* we have a picture start */
824 if (map.data[5] & 0x80) {
825 /* first_mb_in_slice == 0 completes a picture */
828 } else if (nal_type >= 6 && nal_type <= 9) {
829 /* SEI, SPS, PPS, AU terminate picture */
832 GST_DEBUG_OBJECT (depayload, "start %d, complete %d", start, complete);
834 if (complete && rtph264depay->picture_start)
835 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
839 gst_buffer_unmap (nal, &map);
841 GST_DEBUG_OBJECT (depayload, "adding NAL to picture adapter");
842 gst_adapter_push (rtph264depay->picture_adapter, nal);
843 rtph264depay->last_ts = in_timestamp;
844 rtph264depay->last_keyframe |= keyframe;
845 rtph264depay->picture_start |= start;
848 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
851 /* no merge, output is input nal */
852 GST_DEBUG_OBJECT (depayload, "using NAL as output");
854 gst_buffer_unmap (nal, &map);
858 /* prepend codec_data */
859 if (rtph264depay->codec_data) {
860 GST_DEBUG_OBJECT (depayload, "prepending codec_data");
861 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay),
862 rtph264depay->codec_data, outbuf,
863 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
864 outbuf = gst_buffer_append (rtph264depay->codec_data, outbuf);
865 rtph264depay->codec_data = NULL;
868 outbuf = gst_buffer_make_writable (outbuf);
870 gst_rtp_drop_meta (GST_ELEMENT_CAST (rtph264depay), outbuf,
871 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
873 GST_BUFFER_PTS (outbuf) = out_timestamp;
876 GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
878 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
886 GST_WARNING_OBJECT (depayload, "dropping short NAL");
887 gst_buffer_unmap (nal, &map);
888 gst_buffer_unref (nal);
894 gst_rtp_h264_push_fragmentation_unit (GstRtpH264Depay * rtph264depay,
901 outsize = gst_adapter_available (rtph264depay->adapter);
902 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
904 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
905 GST_DEBUG_OBJECT (rtph264depay, "output %d bytes", outsize);
907 if (rtph264depay->byte_stream) {
908 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
911 map.data[0] = (outsize >> 24);
912 map.data[1] = (outsize >> 16);
913 map.data[2] = (outsize >> 8);
914 map.data[3] = (outsize);
916 gst_buffer_unmap (outbuf, &map);
918 rtph264depay->current_fu_type = 0;
920 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf,
921 rtph264depay->fu_timestamp, rtph264depay->fu_marker);
923 if (send && outbuf) {
924 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph264depay), outbuf);
931 gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
933 GstRtpH264Depay *rtph264depay;
934 GstBuffer *outbuf = NULL;
935 guint8 nal_unit_type;
937 rtph264depay = GST_RTP_H264_DEPAY (depayload);
939 /* flush remaining data on discont */
940 if (GST_BUFFER_IS_DISCONT (rtp->buffer)) {
941 gst_adapter_clear (rtph264depay->adapter);
942 rtph264depay->wait_start = TRUE;
943 rtph264depay->current_fu_type = 0;
952 guint outsize, nalu_size;
953 GstClockTime timestamp;
956 timestamp = GST_BUFFER_PTS (rtp->buffer);
958 payload_len = gst_rtp_buffer_get_payload_len (rtp);
959 payload = gst_rtp_buffer_get_payload (rtp);
960 marker = gst_rtp_buffer_get_marker (rtp);
962 GST_DEBUG_OBJECT (rtph264depay, "receiving %d bytes", payload_len);
964 if (payload_len == 0)
975 nal_ref_idc = (payload[0] & 0x60) >> 5;
976 nal_unit_type = payload[0] & 0x1f;
978 /* at least one byte header with type */
981 GST_DEBUG_OBJECT (rtph264depay, "NRI %d, Type %d", nal_ref_idc,
984 /* If FU unit was being processed, but the current nal is of a different
985 * type. Assume that the remote payloader is buggy (didn't set the end bit
986 * when the FU ended) and send out what we gathered thusfar */
987 if (G_UNLIKELY (rtph264depay->current_fu_type != 0 &&
988 nal_unit_type != rtph264depay->current_fu_type))
989 gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
991 switch (nal_unit_type) {
998 /* STAP-B Single-time aggregation packet 5.7.1 */
999 /* 2 byte extra header for DON */
1005 payload += header_len;
1006 payload_len -= header_len;
1008 rtph264depay->wait_start = FALSE;
1011 /* STAP-A Single-time aggregation packet 5.7.1 */
1012 while (payload_len > 2) {
1014 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1015 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1017 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1019 nalu_size = (payload[0] << 8) | payload[1];
1021 /* dont include nalu_size */
1022 if (nalu_size > (payload_len - 2))
1023 nalu_size = payload_len - 2;
1025 outsize = nalu_size + sizeof (sync_bytes);
1026 outbuf = gst_buffer_new_and_alloc (outsize);
1028 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1029 if (rtph264depay->byte_stream) {
1030 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1032 map.data[0] = map.data[1] = 0;
1033 map.data[2] = payload[0];
1034 map.data[3] = payload[1];
1037 /* strip NALU size */
1041 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1042 gst_buffer_unmap (outbuf, &map);
1044 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay), outbuf,
1045 rtp->buffer, g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
1048 gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1051 gst_adapter_push (rtph264depay->adapter, outbuf);
1053 payload += nalu_size;
1054 payload_len -= nalu_size;
1057 outsize = gst_adapter_available (rtph264depay->adapter);
1059 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
1061 gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1067 /* MTAP16 Multi-time aggregation packet 5.7.2 */
1069 /* fallthrough, not implemented */
1071 /* MTAP24 Multi-time aggregation packet 5.7.2 */
1073 goto not_implemented;
1078 /* FU-A Fragmentation unit 5.8 */
1079 /* FU-B Fragmentation unit 5.8 */
1082 /* +---------------+
1088 * R is reserved and always 0
1090 S = (payload[1] & 0x80) == 0x80;
1091 E = (payload[1] & 0x40) == 0x40;
1093 GST_DEBUG_OBJECT (rtph264depay, "S %d, E %d", S, E);
1095 if (rtph264depay->wait_start && !S)
1099 /* NAL unit starts here */
1102 /* If a new FU unit started, while still processing an older one.
1103 * Assume that the remote payloader is buggy (doesn't set the end
1104 * bit) and send out what we've gathered thusfar */
1105 if (G_UNLIKELY (rtph264depay->current_fu_type != 0))
1106 gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
1108 rtph264depay->current_fu_type = nal_unit_type;
1109 rtph264depay->fu_timestamp = timestamp;
1111 rtph264depay->wait_start = FALSE;
1113 /* reconstruct NAL header */
1114 nal_header = (payload[0] & 0xe0) | (payload[1] & 0x1f);
1116 /* strip type header, keep FU header, we'll reuse it to reconstruct
1117 * the NAL header. */
1121 nalu_size = payload_len;
1122 outsize = nalu_size + sizeof (sync_bytes);
1123 outbuf = gst_buffer_new_and_alloc (outsize);
1125 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1126 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1127 map.data[sizeof (sync_bytes)] = nal_header;
1128 gst_buffer_unmap (outbuf, &map);
1130 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay), outbuf,
1131 rtp->buffer, g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
1133 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1135 /* and assemble in the adapter */
1136 gst_adapter_push (rtph264depay->adapter, outbuf);
1138 /* strip off FU indicator and FU header bytes */
1142 outsize = payload_len;
1143 outbuf = gst_buffer_new_and_alloc (outsize);
1144 gst_buffer_fill (outbuf, 0, payload, outsize);
1146 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay), outbuf,
1147 rtp->buffer, g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
1149 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1151 /* and assemble in the adapter */
1152 gst_adapter_push (rtph264depay->adapter, outbuf);
1156 rtph264depay->fu_marker = marker;
1158 /* if NAL unit ends, flush the adapter */
1160 outbuf = gst_rtp_h264_push_fragmentation_unit (rtph264depay, FALSE);
1165 rtph264depay->wait_start = FALSE;
1167 /* 1-23 NAL unit Single NAL unit packet per H.264 5.6 */
1168 /* the entire payload is the output buffer */
1169 nalu_size = payload_len;
1170 outsize = nalu_size + sizeof (sync_bytes);
1171 outbuf = gst_buffer_new_and_alloc (outsize);
1173 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1174 if (rtph264depay->byte_stream) {
1175 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1177 map.data[0] = map.data[1] = 0;
1178 map.data[2] = nalu_size >> 8;
1179 map.data[3] = nalu_size & 0xff;
1181 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1182 gst_buffer_unmap (outbuf, &map);
1184 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay), outbuf,
1185 rtp->buffer, g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
1187 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1199 GST_DEBUG_OBJECT (rtph264depay, "empty packet");
1204 GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
1205 (NULL), ("Undefined packet type"));
1210 GST_DEBUG_OBJECT (rtph264depay, "waiting for start");
1215 GST_ELEMENT_ERROR (rtph264depay, STREAM, FORMAT,
1216 (NULL), ("NAL unit type %d not supported yet", nal_unit_type));
1222 gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
1224 GstRtpH264Depay *rtph264depay;
1226 rtph264depay = GST_RTP_H264_DEPAY (depay);
1228 switch (GST_EVENT_TYPE (event)) {
1229 case GST_EVENT_FLUSH_STOP:
1230 gst_rtp_h264_depay_reset (rtph264depay);
1237 GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (depay, event);
1240 static GstStateChangeReturn
1241 gst_rtp_h264_depay_change_state (GstElement * element,
1242 GstStateChange transition)
1244 GstRtpH264Depay *rtph264depay;
1245 GstStateChangeReturn ret;
1247 rtph264depay = GST_RTP_H264_DEPAY (element);
1249 switch (transition) {
1250 case GST_STATE_CHANGE_NULL_TO_READY:
1252 case GST_STATE_CHANGE_READY_TO_PAUSED:
1253 gst_rtp_h264_depay_reset (rtph264depay);
1259 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1261 switch (transition) {
1262 case GST_STATE_CHANGE_READY_TO_NULL:
1271 gst_rtp_h264_depay_plugin_init (GstPlugin * plugin)
1273 GST_DEBUG_CATEGORY_INIT (rtph264depay_debug, "rtph264depay", 0,
1274 "H264 Video RTP Depayloader");
1276 return gst_element_register (plugin, "rtph264depay",
1277 GST_RANK_SECONDARY, GST_TYPE_RTP_H264_DEPAY);