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 "gstrtph264depay.h"
31 GST_DEBUG_CATEGORY_STATIC (rtph264depay_debug);
32 #define GST_CAT_DEFAULT (rtph264depay_debug)
34 /* This is what we'll default to when downstream hasn't
35 * expressed a restriction or preference via caps */
36 #define DEFAULT_BYTE_STREAM TRUE
37 #define DEFAULT_ACCESS_UNIT FALSE
39 /* 3 zero bytes syncword */
40 static const guint8 sync_bytes[] = { 0, 0, 0, 1 };
42 static GstStaticPadTemplate gst_rtp_h264_depay_src_template =
43 GST_STATIC_PAD_TEMPLATE ("src",
46 GST_STATIC_CAPS ("video/x-h264, "
47 "stream-format = (string) avc, alignment = (string) au; "
49 "stream-format = (string) byte-stream, alignment = (string) { nal, au }")
52 static GstStaticPadTemplate gst_rtp_h264_depay_sink_template =
53 GST_STATIC_PAD_TEMPLATE ("sink",
56 GST_STATIC_CAPS ("application/x-rtp, "
57 "media = (string) \"video\", "
58 "clock-rate = (int) 90000, " "encoding-name = (string) \"H264\"")
59 /** optional parameters **/
60 /* "profile-level-id = (string) ANY, " */
61 /* "max-mbps = (string) ANY, " */
62 /* "max-fs = (string) ANY, " */
63 /* "max-cpb = (string) ANY, " */
64 /* "max-dpb = (string) ANY, " */
65 /* "max-br = (string) ANY, " */
66 /* "redundant-pic-cap = (string) { \"0\", \"1\" }, " */
67 /* "sprop-parameter-sets = (string) ANY, " */
68 /* "parameter-add = (string) { \"0\", \"1\" }, " */
69 /* "packetization-mode = (string) { \"0\", \"1\", \"2\" }, " */
70 /* "sprop-interleaving-depth = (string) ANY, " */
71 /* "sprop-deint-buf-req = (string) ANY, " */
72 /* "deint-buf-cap = (string) ANY, " */
73 /* "sprop-init-buf-time = (string) ANY, " */
74 /* "sprop-max-don-diff = (string) ANY, " */
75 /* "max-rcmd-nalu-size = (string) ANY " */
78 #define gst_rtp_h264_depay_parent_class parent_class
79 G_DEFINE_TYPE (GstRtpH264Depay, gst_rtp_h264_depay,
80 GST_TYPE_RTP_BASE_DEPAYLOAD);
82 static void gst_rtp_h264_depay_finalize (GObject * object);
84 static GstStateChangeReturn gst_rtp_h264_depay_change_state (GstElement *
85 element, GstStateChange transition);
87 static GstBuffer *gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload,
89 static gboolean gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * filter,
91 static gboolean gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay,
95 gst_rtp_h264_depay_class_init (GstRtpH264DepayClass * klass)
97 GObjectClass *gobject_class;
98 GstElementClass *gstelement_class;
99 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
101 gobject_class = (GObjectClass *) klass;
102 gstelement_class = (GstElementClass *) klass;
103 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
105 gobject_class->finalize = gst_rtp_h264_depay_finalize;
107 gst_element_class_add_pad_template (gstelement_class,
108 gst_static_pad_template_get (&gst_rtp_h264_depay_src_template));
109 gst_element_class_add_pad_template (gstelement_class,
110 gst_static_pad_template_get (&gst_rtp_h264_depay_sink_template));
112 gst_element_class_set_static_metadata (gstelement_class,
113 "RTP H264 depayloader", "Codec/Depayloader/Network/RTP",
114 "Extracts H264 video from RTP packets (RFC 3984)",
115 "Wim Taymans <wim.taymans@gmail.com>");
116 gstelement_class->change_state = gst_rtp_h264_depay_change_state;
118 gstrtpbasedepayload_class->process = gst_rtp_h264_depay_process;
119 gstrtpbasedepayload_class->set_caps = gst_rtp_h264_depay_setcaps;
120 gstrtpbasedepayload_class->handle_event = gst_rtp_h264_depay_handle_event;
122 GST_DEBUG_CATEGORY_INIT (rtph264depay_debug, "rtph264depay", 0,
123 "H264 Video RTP Depayloader");
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;
232 /* Stolen from bad/gst/mpegtsdemux/payloader_parsers.c */
233 /* variable length Exp-Golomb parsing according to H.264 spec 9.1*/
235 read_golomb (GstBitReader * br, guint32 * value)
237 guint8 b, leading_zeros = -1;
240 for (b = 0; !b; leading_zeros++) {
241 if (!gst_bit_reader_get_bits_uint8 (br, &b, 1))
246 *value = (*value >> 1) - 1;
247 if (leading_zeros > 0) {
249 if (!gst_bit_reader_get_bits_uint32 (br, &tmp, leading_zeros))
258 parse_sps (GstMapInfo * map, guint32 * sps_id)
260 GstBitReader br = GST_BIT_READER_INIT (map->data + 4,
266 if (!read_golomb (&br, sps_id))
273 parse_pps (GstMapInfo * map, guint32 * sps_id, guint32 * pps_id)
275 GstBitReader br = GST_BIT_READER_INIT (map->data + 1,
281 if (!read_golomb (&br, pps_id))
283 if (!read_golomb (&br, sps_id))
291 gst_rtp_h264_set_src_caps (GstRtpH264Depay * rtph264depay)
296 guchar profile_compat = G_MAXUINT8;
298 if (!rtph264depay->byte_stream &&
299 (!rtph264depay->new_codec_data ||
300 rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0))
303 srccaps = gst_caps_new_simple ("video/x-h264",
304 "stream-format", G_TYPE_STRING,
305 rtph264depay->byte_stream ? "byte-stream" : "avc",
306 "alignment", G_TYPE_STRING, rtph264depay->merge ? "au" : "nal", NULL);
308 if (!rtph264depay->byte_stream) {
309 GstBuffer *codec_data;
317 /* start with 7 bytes header */
319 /* count sps & pps */
320 for (i = 0; i < rtph264depay->sps->len; i++)
321 len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->sps, i));
322 for (i = 0; i < rtph264depay->pps->len; i++)
323 len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->pps, i));
325 codec_data = gst_buffer_new_and_alloc (len);
326 g_debug ("alloc_len: %u", len);
327 gst_buffer_map (codec_data, &map, GST_MAP_READWRITE);
330 /* 8 bits version == 1 */
333 /* According to: ISO/IEC 14496-15:2004(E) section 5.2.4.1
334 * The level is the max level of all SPSes
335 * A profile compat bit can only be set if all SPSes include that bit
337 for (i = 0; i < rtph264depay->sps->len; i++) {
338 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
340 profile_compat &= nalmap.data[2];
341 level = MAX (level, nalmap.data[3]);
342 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
345 /* Assume all SPSes use the same profile, so extract from the first SPS */
346 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, 0), &nalmap,
348 *data++ = nalmap.data[1];
349 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, 0), &nalmap);
350 *data++ = profile_compat;
353 /* 6 bits reserved | 2 bits lengthSizeMinusOn */
355 /* 3 bits reserved | 5 bits numOfSequenceParameterSets */
356 *data++ = 0xe0 | (rtph264depay->sps->len & 0x1f);
359 for (i = 0; i < rtph264depay->sps->len; i++) {
360 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
363 GST_DEBUG_OBJECT (rtph264depay, "copy SPS %d of length %u", i,
364 (guint) nalmap.size);
365 GST_WRITE_UINT16_BE (data, nalmap.size);
367 memcpy (data, nalmap.data, nalmap.size);
369 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
372 /* 8 bits numOfPictureParameterSets */
373 *data++ = rtph264depay->pps->len;
375 for (i = 0; i < rtph264depay->pps->len; i++) {
376 gst_buffer_map (g_ptr_array_index (rtph264depay->pps, i), &nalmap,
379 GST_DEBUG_OBJECT (rtph264depay, "copy PPS %d of length %u", i,
380 (guint) nalmap.size);
381 GST_WRITE_UINT16_BE (data, nalmap.size);
383 memcpy (data, nalmap.data, nalmap.size);
385 gst_buffer_unmap (g_ptr_array_index (rtph264depay->pps, i), &nalmap);
388 new_size = data - map.data;
389 gst_buffer_unmap (codec_data, &map);
390 gst_buffer_set_size (codec_data, new_size);
393 gst_caps_set_simple (srccaps,
394 "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
395 gst_buffer_unref (codec_data);
398 res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
400 gst_caps_unref (srccaps);
403 rtph264depay->new_codec_data = FALSE;
409 gst_rtp_h264_add_sps_pps (GstRtpH264Depay * rtph264depay, GstBuffer * nal)
415 gst_buffer_map (nal, &map, GST_MAP_READ);
417 type = map.data[0] & 0x1f;
422 if (!parse_sps (&map, &sps_id)) {
423 GST_WARNING_OBJECT (rtph264depay, "Invalid SPS,"
424 " can't parse seq_parameter_set_id");
428 for (i = 0; i < rtph264depay->sps->len; i++) {
429 GstBuffer *sps = g_ptr_array_index (rtph264depay->sps, i);
433 gst_buffer_map (sps, &spsmap, GST_MAP_READ);
434 parse_sps (&spsmap, &tmp_sps_id);
436 if (sps_id == tmp_sps_id) {
437 if (map.size == spsmap.size &&
438 memcmp (map.data, spsmap.data, spsmap.size) == 0) {
439 GST_LOG_OBJECT (rtph264depay, "Unchanged SPS %u, not updating",
441 gst_buffer_unmap (sps, &spsmap);
444 gst_buffer_unmap (sps, &spsmap);
445 g_ptr_array_remove_index_fast (rtph264depay->sps, i);
446 g_ptr_array_add (rtph264depay->sps, nal);
447 GST_LOG_OBJECT (rtph264depay, "Modified SPS %u, replacing", sps_id);
451 gst_buffer_unmap (sps, &spsmap);
453 GST_LOG_OBJECT (rtph264depay, "Adding new SPS %u", sps_id);
454 g_ptr_array_add (rtph264depay->sps, nal);
455 } else if (type == 8) {
459 if (!parse_pps (&map, &sps_id, &pps_id)) {
460 GST_WARNING_OBJECT (rtph264depay, "Invalid PPS,"
461 " can't parse seq_parameter_set_id or pic_parameter_set_id");
465 for (i = 0; i < rtph264depay->pps->len; i++) {
466 GstBuffer *pps = g_ptr_array_index (rtph264depay->pps, i);
472 gst_buffer_map (pps, &ppsmap, GST_MAP_READ);
473 parse_pps (&ppsmap, &tmp_sps_id, &tmp_pps_id);
475 if (sps_id == tmp_sps_id && pps_id == tmp_pps_id) {
476 if (map.size == ppsmap.size &&
477 memcmp (map.data, ppsmap.data, ppsmap.size) == 0) {
478 GST_LOG_OBJECT (rtph264depay, "Unchanged PPS %u:%u, not updating",
480 gst_buffer_unmap (pps, &ppsmap);
483 gst_buffer_unmap (pps, &ppsmap);
484 g_ptr_array_remove_index_fast (rtph264depay->pps, i);
485 g_ptr_array_add (rtph264depay->pps, nal);
486 GST_LOG_OBJECT (rtph264depay, "Modified PPS %u:%u, replacing",
491 gst_buffer_unmap (pps, &ppsmap);
493 GST_LOG_OBJECT (rtph264depay, "Adding new PPS %u:%i", sps_id, pps_id);
494 g_ptr_array_add (rtph264depay->pps, nal);
500 gst_buffer_unmap (nal, &map);
501 rtph264depay->new_codec_data = TRUE;
506 gst_buffer_unmap (nal, &map);
507 gst_buffer_unref (nal);
513 gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
516 GstStructure *structure = gst_caps_get_structure (caps, 0);
517 GstRtpH264Depay *rtph264depay;
519 GstBuffer *codec_data;
523 rtph264depay = GST_RTP_H264_DEPAY (depayload);
525 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
527 depayload->clock_rate = clock_rate;
529 /* Base64 encoded, comma separated config NALs */
530 ps = gst_structure_get_string (structure, "sprop-parameter-sets");
532 /* negotiate with downstream w.r.t. output format and alignment */
533 gst_rtp_h264_depay_negotiate (rtph264depay);
535 if (rtph264depay->byte_stream && ps != NULL) {
536 /* for bytestream we only need the parameter sets but we don't error out
537 * when they are not there, we assume they are in the stream. */
542 params = g_strsplit (ps, ",", 0);
544 /* count total number of bytes in base64. Also include the sync bytes in
545 * front of the params. */
547 for (i = 0; params[i]; i++) {
548 len += strlen (params[i]);
549 len += sizeof (sync_bytes);
551 /* we seriously overshoot the length, but it's fine. */
552 codec_data = gst_buffer_new_and_alloc (len);
554 gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
557 for (i = 0; params[i]; i++) {
561 GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
562 memcpy (ptr, sync_bytes, sizeof (sync_bytes));
563 ptr += sizeof (sync_bytes);
565 g_base64_decode_step (params[i], strlen (params[i]), ptr, &state,
567 GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
568 total += len + sizeof (sync_bytes);
571 gst_buffer_unmap (codec_data, &map);
572 gst_buffer_resize (codec_data, 0, total);
575 /* keep the codec_data, we need to send it as the first buffer. We cannot
576 * push it in the adapter because the adapter might be flushed on discont.
578 if (rtph264depay->codec_data)
579 gst_buffer_unref (rtph264depay->codec_data);
580 rtph264depay->codec_data = codec_data;
581 } else if (!rtph264depay->byte_stream) {
586 goto incomplete_caps;
588 params = g_strsplit (ps, ",", 0);
590 GST_DEBUG_OBJECT (depayload, "we have %d params", g_strv_length (params));
592 /* start with 7 bytes header */
593 for (i = 0; params[i]; i++) {
600 nal_len = strlen (params[i]);
601 nal = gst_buffer_new_and_alloc (nal_len);
602 gst_buffer_map (nal, &nalmap, GST_MAP_READWRITE);
605 g_base64_decode_step (params[i], nal_len, nalmap.data, &state, &save);
607 GST_DEBUG_OBJECT (depayload, "adding param %d as %s", i,
608 ((nalmap.data[0] & 0x1f) == 7) ? "SPS" : "PPS");
610 gst_buffer_unmap (nal, &nalmap);
611 gst_buffer_set_size (nal, nal_len);
613 gst_rtp_h264_add_sps_pps (rtph264depay, nal);
617 if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0)
618 goto incomplete_caps;
621 return gst_rtp_h264_set_src_caps (rtph264depay);
626 GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
627 " doing setcaps later");
633 gst_rtp_h264_complete_au (GstRtpH264Depay * rtph264depay,
634 GstClockTime * out_timestamp, gboolean * out_keyframe)
639 /* we had a picture in the adapter and we completed it */
640 GST_DEBUG_OBJECT (rtph264depay, "taking completed AU");
641 outsize = gst_adapter_available (rtph264depay->picture_adapter);
642 outbuf = gst_adapter_take_buffer (rtph264depay->picture_adapter, outsize);
644 *out_timestamp = rtph264depay->last_ts;
645 *out_keyframe = rtph264depay->last_keyframe;
647 rtph264depay->last_keyframe = FALSE;
648 rtph264depay->picture_start = FALSE;
653 /* SPS/PPS/IDR considered key, all others DELTA;
654 * so downstream waiting for keyframe can pick up at SPS/PPS/IDR */
655 #define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8))
658 gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
659 GstClockTime in_timestamp, gboolean marker)
661 GstRTPBaseDepayload *depayload = GST_RTP_BASE_DEPAYLOAD (rtph264depay);
664 GstBuffer *outbuf = NULL;
665 GstClockTime out_timestamp;
666 gboolean keyframe, out_keyframe;
668 gst_buffer_map (nal, &map, GST_MAP_READ);
669 if (G_UNLIKELY (map.size < 5))
672 nal_type = map.data[4] & 0x1f;
673 GST_DEBUG_OBJECT (rtph264depay, "handle NAL type %d", nal_type);
675 keyframe = NAL_TYPE_IS_KEY (nal_type);
677 out_keyframe = keyframe;
678 out_timestamp = in_timestamp;
680 if (!rtph264depay->byte_stream) {
681 if (nal_type == 7 || nal_type == 8) {
682 gst_rtp_h264_add_sps_pps (rtph264depay,
683 gst_buffer_copy_region (nal, GST_BUFFER_COPY_ALL,
684 4, gst_buffer_get_size (nal) - 4));
685 gst_buffer_unmap (nal, &map);
686 gst_buffer_unref (nal);
688 } else if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0) {
689 /* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
692 gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
693 gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
694 gst_structure_new ("GstForceKeyUnit",
695 "all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
696 gst_buffer_unmap (nal, &map);
697 gst_buffer_unref (nal);
701 if (rtph264depay->new_codec_data &&
702 rtph264depay->sps->len > 0 && rtph264depay->pps->len > 0)
703 gst_rtp_h264_set_src_caps (rtph264depay);
707 if (rtph264depay->merge) {
708 gboolean start = FALSE, complete = FALSE;
710 /* consider a coded slices (IDR or not) to start a picture,
711 * (so ending the previous one) if first_mb_in_slice == 0
712 * (non-0 is part of previous one) */
713 /* NOTE this is not entirely according to Access Unit specs in 7.4.1.2.4,
714 * but in practice it works in sane cases, needs not much parsing,
715 * and also works with broken frame_num in NAL (where spec-wise would fail) */
716 if (nal_type == 1 || nal_type == 2 || nal_type == 5) {
717 /* we have a picture start */
719 if (map.data[5] & 0x80) {
720 /* first_mb_in_slice == 0 completes a picture */
723 } else if (nal_type >= 6 && nal_type <= 9) {
724 /* SEI, SPS, PPS, AU terminate picture */
727 GST_DEBUG_OBJECT (depayload, "start %d, complete %d", start, complete);
729 if (complete && rtph264depay->picture_start)
730 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
734 gst_buffer_unmap (nal, &map);
736 GST_DEBUG_OBJECT (depayload, "adding NAL to picture adapter");
737 gst_adapter_push (rtph264depay->picture_adapter, nal);
738 rtph264depay->last_ts = in_timestamp;
739 rtph264depay->last_keyframe |= keyframe;
740 rtph264depay->picture_start |= start;
743 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
746 /* no merge, output is input nal */
747 GST_DEBUG_OBJECT (depayload, "using NAL as output");
749 gst_buffer_unmap (nal, &map);
753 /* prepend codec_data */
754 if (rtph264depay->codec_data) {
755 GST_DEBUG_OBJECT (depayload, "prepending codec_data");
756 outbuf = gst_buffer_append (rtph264depay->codec_data, outbuf);
757 rtph264depay->codec_data = NULL;
760 outbuf = gst_buffer_make_writable (outbuf);
762 GST_BUFFER_TIMESTAMP (outbuf) = out_timestamp;
765 GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
767 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
775 GST_WARNING_OBJECT (depayload, "dropping short NAL");
776 gst_buffer_unmap (nal, &map);
777 gst_buffer_unref (nal);
783 gst_rtp_h264_push_fragmentation_unit (GstRtpH264Depay * rtph264depay,
790 outsize = gst_adapter_available (rtph264depay->adapter);
791 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
793 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
794 GST_DEBUG_OBJECT (rtph264depay, "output %d bytes", outsize);
796 if (rtph264depay->byte_stream) {
797 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
800 map.data[0] = (outsize >> 24);
801 map.data[1] = (outsize >> 16);
802 map.data[2] = (outsize >> 8);
803 map.data[3] = (outsize);
805 gst_buffer_unmap (outbuf, &map);
807 rtph264depay->current_fu_type = 0;
809 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf,
810 rtph264depay->fu_timestamp, rtph264depay->fu_marker);
812 if (send && outbuf) {
813 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph264depay), outbuf);
820 gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
822 GstRtpH264Depay *rtph264depay;
823 GstBuffer *outbuf = NULL;
824 guint8 nal_unit_type;
825 GstRTPBuffer rtp = { NULL };
827 rtph264depay = GST_RTP_H264_DEPAY (depayload);
829 /* flush remaining data on discont */
830 if (GST_BUFFER_IS_DISCONT (buf)) {
831 gst_adapter_clear (rtph264depay->adapter);
832 rtph264depay->wait_start = TRUE;
833 rtph264depay->current_fu_type = 0;
842 guint outsize, nalu_size;
843 GstClockTime timestamp;
846 timestamp = GST_BUFFER_TIMESTAMP (buf);
848 gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
850 payload_len = gst_rtp_buffer_get_payload_len (&rtp);
851 payload = gst_rtp_buffer_get_payload (&rtp);
852 marker = gst_rtp_buffer_get_marker (&rtp);
854 GST_DEBUG_OBJECT (rtph264depay, "receiving %d bytes", payload_len);
856 if (payload_len == 0)
867 nal_ref_idc = (payload[0] & 0x60) >> 5;
868 nal_unit_type = payload[0] & 0x1f;
870 /* at least one byte header with type */
873 GST_DEBUG_OBJECT (rtph264depay, "NRI %d, Type %d", nal_ref_idc,
876 /* If FU unit was being processed, but the current nal is of a different
877 * type. Assume that the remote payloader is buggy (didn't set the end bit
878 * when the FU ended) and send out what we gathered thusfar */
879 if (G_UNLIKELY (rtph264depay->current_fu_type != 0 &&
880 nal_unit_type != rtph264depay->current_fu_type))
881 gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
883 switch (nal_unit_type) {
890 /* STAP-B Single-time aggregation packet 5.7.1 */
891 /* 2 byte extra header for DON */
897 payload += header_len;
898 payload_len -= header_len;
900 rtph264depay->wait_start = FALSE;
903 /* STAP-A Single-time aggregation packet 5.7.1 */
904 while (payload_len > 2) {
906 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
907 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
909 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
911 nalu_size = (payload[0] << 8) | payload[1];
913 /* dont include nalu_size */
914 if (nalu_size > (payload_len - 2))
915 nalu_size = payload_len - 2;
917 outsize = nalu_size + sizeof (sync_bytes);
918 outbuf = gst_buffer_new_and_alloc (outsize);
920 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
921 if (rtph264depay->byte_stream) {
922 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
924 map.data[0] = map.data[1] = 0;
925 map.data[2] = payload[0];
926 map.data[3] = payload[1];
929 /* strip NALU size */
933 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
934 gst_buffer_unmap (outbuf, &map);
936 gst_adapter_push (rtph264depay->adapter, outbuf);
938 payload += nalu_size;
939 payload_len -= nalu_size;
942 outsize = gst_adapter_available (rtph264depay->adapter);
943 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
945 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
950 /* MTAP16 Multi-time aggregation packet 5.7.2 */
952 /* fallthrough, not implemented */
954 /* MTAP24 Multi-time aggregation packet 5.7.2 */
956 goto not_implemented;
961 /* FU-A Fragmentation unit 5.8 */
962 /* FU-B Fragmentation unit 5.8 */
971 * R is reserved and always 0
973 S = (payload[1] & 0x80) == 0x80;
974 E = (payload[1] & 0x40) == 0x40;
976 GST_DEBUG_OBJECT (rtph264depay, "S %d, E %d", S, E);
978 if (rtph264depay->wait_start && !S)
982 /* NAL unit starts here */
985 /* If a new FU unit started, while still processing an older one.
986 * Assume that the remote payloader is buggy (doesn't set the end
987 * bit) and send out what we've gathered thusfar */
988 if (G_UNLIKELY (rtph264depay->current_fu_type != 0))
989 gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
991 rtph264depay->current_fu_type = nal_unit_type;
992 rtph264depay->fu_timestamp = timestamp;
994 rtph264depay->wait_start = FALSE;
996 /* reconstruct NAL header */
997 nal_header = (payload[0] & 0xe0) | (payload[1] & 0x1f);
999 /* strip type header, keep FU header, we'll reuse it to reconstruct
1000 * the NAL header. */
1004 nalu_size = payload_len;
1005 outsize = nalu_size + sizeof (sync_bytes);
1006 outbuf = gst_buffer_new_and_alloc (outsize);
1008 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1009 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1010 map.data[sizeof (sync_bytes)] = nal_header;
1011 gst_buffer_unmap (outbuf, &map);
1013 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1015 /* and assemble in the adapter */
1016 gst_adapter_push (rtph264depay->adapter, outbuf);
1018 /* strip off FU indicator and FU header bytes */
1022 outsize = payload_len;
1023 outbuf = gst_buffer_new_and_alloc (outsize);
1024 gst_buffer_fill (outbuf, 0, payload, outsize);
1026 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1028 /* and assemble in the adapter */
1029 gst_adapter_push (rtph264depay->adapter, outbuf);
1033 rtph264depay->fu_marker = marker;
1035 /* if NAL unit ends, flush the adapter */
1037 outbuf = gst_rtp_h264_push_fragmentation_unit (rtph264depay, FALSE);
1042 rtph264depay->wait_start = FALSE;
1044 /* 1-23 NAL unit Single NAL unit packet per H.264 5.6 */
1045 /* the entire payload is the output buffer */
1046 nalu_size = payload_len;
1047 outsize = nalu_size + sizeof (sync_bytes);
1048 outbuf = gst_buffer_new_and_alloc (outsize);
1050 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1051 if (rtph264depay->byte_stream) {
1052 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1054 map.data[0] = map.data[1] = 0;
1055 map.data[2] = nalu_size >> 8;
1056 map.data[3] = nalu_size & 0xff;
1058 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1059 gst_buffer_unmap (outbuf, &map);
1061 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1066 gst_rtp_buffer_unmap (&rtp);
1074 GST_DEBUG_OBJECT (rtph264depay, "empty packet");
1075 gst_rtp_buffer_unmap (&rtp);
1080 GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
1081 (NULL), ("Undefined packet type"));
1082 gst_rtp_buffer_unmap (&rtp);
1087 GST_DEBUG_OBJECT (rtph264depay, "waiting for start");
1088 gst_rtp_buffer_unmap (&rtp);
1093 GST_ELEMENT_ERROR (rtph264depay, STREAM, FORMAT,
1094 (NULL), ("NAL unit type %d not supported yet", nal_unit_type));
1095 gst_rtp_buffer_unmap (&rtp);
1101 gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
1103 GstRtpH264Depay *rtph264depay;
1105 rtph264depay = GST_RTP_H264_DEPAY (depay);
1107 switch (GST_EVENT_TYPE (event)) {
1108 case GST_EVENT_FLUSH_STOP:
1109 gst_rtp_h264_depay_reset (rtph264depay);
1116 GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (depay, event);
1119 static GstStateChangeReturn
1120 gst_rtp_h264_depay_change_state (GstElement * element,
1121 GstStateChange transition)
1123 GstRtpH264Depay *rtph264depay;
1124 GstStateChangeReturn ret;
1126 rtph264depay = GST_RTP_H264_DEPAY (element);
1128 switch (transition) {
1129 case GST_STATE_CHANGE_NULL_TO_READY:
1131 case GST_STATE_CHANGE_READY_TO_PAUSED:
1132 gst_rtp_h264_depay_reset (rtph264depay);
1138 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1140 switch (transition) {
1141 case GST_STATE_CHANGE_READY_TO_NULL:
1150 gst_rtp_h264_depay_plugin_init (GstPlugin * plugin)
1152 return gst_element_register (plugin, "rtph264depay",
1153 GST_RANK_SECONDARY, GST_TYPE_RTP_H264_DEPAY);