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., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, 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 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
59 "clock-rate = (int) 90000, " "encoding-name = (string) \"H264\"")
60 /** optional parameters **/
61 /* "profile-level-id = (string) ANY, " */
62 /* "max-mbps = (string) ANY, " */
63 /* "max-fs = (string) ANY, " */
64 /* "max-cpb = (string) ANY, " */
65 /* "max-dpb = (string) ANY, " */
66 /* "max-br = (string) ANY, " */
67 /* "redundant-pic-cap = (string) { \"0\", \"1\" }, " */
68 /* "sprop-parameter-sets = (string) ANY, " */
69 /* "parameter-add = (string) { \"0\", \"1\" }, " */
70 /* "packetization-mode = (string) { \"0\", \"1\", \"2\" }, " */
71 /* "sprop-interleaving-depth = (string) ANY, " */
72 /* "sprop-deint-buf-req = (string) ANY, " */
73 /* "deint-buf-cap = (string) ANY, " */
74 /* "sprop-init-buf-time = (string) ANY, " */
75 /* "sprop-max-don-diff = (string) ANY, " */
76 /* "max-rcmd-nalu-size = (string) ANY " */
79 #define gst_rtp_h264_depay_parent_class parent_class
80 G_DEFINE_TYPE (GstRtpH264Depay, gst_rtp_h264_depay,
81 GST_TYPE_RTP_BASE_DEPAYLOAD);
83 static void gst_rtp_h264_depay_finalize (GObject * object);
85 static GstStateChangeReturn gst_rtp_h264_depay_change_state (GstElement *
86 element, GstStateChange transition);
88 static GstBuffer *gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload,
90 static gboolean gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * filter,
92 static gboolean gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay,
96 gst_rtp_h264_depay_class_init (GstRtpH264DepayClass * klass)
98 GObjectClass *gobject_class;
99 GstElementClass *gstelement_class;
100 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
102 gobject_class = (GObjectClass *) klass;
103 gstelement_class = (GstElementClass *) klass;
104 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
106 gobject_class->finalize = gst_rtp_h264_depay_finalize;
108 gst_element_class_add_pad_template (gstelement_class,
109 gst_static_pad_template_get (&gst_rtp_h264_depay_src_template));
110 gst_element_class_add_pad_template (gstelement_class,
111 gst_static_pad_template_get (&gst_rtp_h264_depay_sink_template));
113 gst_element_class_set_static_metadata (gstelement_class,
114 "RTP H264 depayloader", "Codec/Depayloader/Network/RTP",
115 "Extracts H264 video from RTP packets (RFC 3984)",
116 "Wim Taymans <wim.taymans@gmail.com>");
117 gstelement_class->change_state = gst_rtp_h264_depay_change_state;
119 gstrtpbasedepayload_class->process = gst_rtp_h264_depay_process;
120 gstrtpbasedepayload_class->set_caps = gst_rtp_h264_depay_setcaps;
121 gstrtpbasedepayload_class->handle_event = gst_rtp_h264_depay_handle_event;
123 GST_DEBUG_CATEGORY_INIT (rtph264depay_debug, "rtph264depay", 0,
124 "H264 Video RTP Depayloader");
128 gst_rtp_h264_depay_init (GstRtpH264Depay * rtph264depay)
130 rtph264depay->adapter = gst_adapter_new ();
131 rtph264depay->picture_adapter = gst_adapter_new ();
132 rtph264depay->byte_stream = DEFAULT_BYTE_STREAM;
133 rtph264depay->merge = DEFAULT_ACCESS_UNIT;
134 rtph264depay->sps = g_ptr_array_new_with_free_func (
135 (GDestroyNotify) gst_buffer_unref);
136 rtph264depay->pps = g_ptr_array_new_with_free_func (
137 (GDestroyNotify) gst_buffer_unref);
141 gst_rtp_h264_depay_reset (GstRtpH264Depay * rtph264depay)
143 gst_adapter_clear (rtph264depay->adapter);
144 rtph264depay->wait_start = TRUE;
145 gst_adapter_clear (rtph264depay->picture_adapter);
146 rtph264depay->picture_start = FALSE;
147 rtph264depay->last_keyframe = FALSE;
148 rtph264depay->last_ts = 0;
149 rtph264depay->current_fu_type = 0;
150 rtph264depay->new_codec_data = FALSE;
151 g_ptr_array_set_size (rtph264depay->sps, 0);
152 g_ptr_array_set_size (rtph264depay->pps, 0);
156 gst_rtp_h264_depay_finalize (GObject * object)
158 GstRtpH264Depay *rtph264depay;
160 rtph264depay = GST_RTP_H264_DEPAY (object);
162 if (rtph264depay->codec_data)
163 gst_buffer_unref (rtph264depay->codec_data);
165 g_object_unref (rtph264depay->adapter);
166 g_object_unref (rtph264depay->picture_adapter);
168 g_ptr_array_free (rtph264depay->sps, TRUE);
169 g_ptr_array_free (rtph264depay->pps, TRUE);
171 G_OBJECT_CLASS (parent_class)->finalize (object);
175 gst_rtp_h264_depay_negotiate (GstRtpH264Depay * rtph264depay)
178 gint byte_stream = -1;
182 gst_pad_get_allowed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay));
184 GST_DEBUG_OBJECT (rtph264depay, "allowed caps: %" GST_PTR_FORMAT, caps);
187 if (gst_caps_get_size (caps) > 0) {
188 GstStructure *s = gst_caps_get_structure (caps, 0);
189 const gchar *str = NULL;
191 if ((str = gst_structure_get_string (s, "stream-format"))) {
192 if (strcmp (str, "avc") == 0) {
194 } else if (strcmp (str, "byte-stream") == 0) {
197 GST_DEBUG_OBJECT (rtph264depay, "unknown stream-format: %s", str);
201 if ((str = gst_structure_get_string (s, "alignment"))) {
202 if (strcmp (str, "au") == 0) {
204 } else if (strcmp (str, "nal") == 0) {
207 GST_DEBUG_OBJECT (rtph264depay, "unknown alignment: %s", str);
211 gst_caps_unref (caps);
214 if (byte_stream != -1) {
215 GST_DEBUG_OBJECT (rtph264depay, "downstream requires byte-stream %d",
217 rtph264depay->byte_stream = byte_stream;
219 GST_DEBUG_OBJECT (rtph264depay, "defaulting to byte-stream %d",
220 DEFAULT_BYTE_STREAM);
221 rtph264depay->byte_stream = DEFAULT_BYTE_STREAM;
224 GST_DEBUG_OBJECT (rtph264depay, "downstream requires merge %d", merge);
225 rtph264depay->merge = merge;
227 GST_DEBUG_OBJECT (rtph264depay, "defaulting to merge %d",
228 DEFAULT_ACCESS_UNIT);
229 rtph264depay->merge = DEFAULT_ACCESS_UNIT;
233 /* Stolen from bad/gst/mpegtsdemux/payloader_parsers.c */
234 /* variable length Exp-Golomb parsing according to H.264 spec 9.1*/
236 read_golomb (GstBitReader * br, guint32 * value)
238 guint8 b, leading_zeros = -1;
241 for (b = 0; !b; leading_zeros++) {
242 if (!gst_bit_reader_get_bits_uint8 (br, &b, 1))
247 *value = (*value >> 1) - 1;
248 if (leading_zeros > 0) {
250 if (!gst_bit_reader_get_bits_uint32 (br, &tmp, leading_zeros))
259 parse_sps (GstMapInfo * map, guint32 * sps_id)
261 GstBitReader br = GST_BIT_READER_INIT (map->data + 4,
267 if (!read_golomb (&br, sps_id))
274 parse_pps (GstMapInfo * map, guint32 * sps_id, guint32 * pps_id)
276 GstBitReader br = GST_BIT_READER_INIT (map->data + 1,
282 if (!read_golomb (&br, pps_id))
284 if (!read_golomb (&br, sps_id))
292 gst_rtp_h264_set_src_caps (GstRtpH264Depay * rtph264depay)
297 guchar profile_compat = G_MAXUINT8;
299 if (!rtph264depay->byte_stream &&
300 (!rtph264depay->new_codec_data ||
301 rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0))
304 srccaps = gst_caps_new_simple ("video/x-h264",
305 "stream-format", G_TYPE_STRING,
306 rtph264depay->byte_stream ? "byte-stream" : "avc",
307 "alignment", G_TYPE_STRING, rtph264depay->merge ? "au" : "nal", NULL);
309 if (!rtph264depay->byte_stream) {
310 GstBuffer *codec_data;
318 /* start with 7 bytes header */
320 /* count sps & pps */
321 for (i = 0; i < rtph264depay->sps->len; i++)
322 len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->sps, i));
323 for (i = 0; i < rtph264depay->pps->len; i++)
324 len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->pps, i));
326 codec_data = gst_buffer_new_and_alloc (len);
327 g_debug ("alloc_len: %u", len);
328 gst_buffer_map (codec_data, &map, GST_MAP_READWRITE);
331 /* 8 bits version == 1 */
334 /* According to: ISO/IEC 14496-15:2004(E) section 5.2.4.1
335 * The level is the max level of all SPSes
336 * A profile compat bit can only be set if all SPSes include that bit
338 for (i = 0; i < rtph264depay->sps->len; i++) {
339 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
341 profile_compat &= nalmap.data[2];
342 level = MAX (level, nalmap.data[3]);
343 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
346 /* Assume all SPSes use the same profile, so extract from the first SPS */
347 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, 0), &nalmap,
349 *data++ = nalmap.data[1];
350 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, 0), &nalmap);
351 *data++ = profile_compat;
354 /* 6 bits reserved | 2 bits lengthSizeMinusOn */
356 /* 3 bits reserved | 5 bits numOfSequenceParameterSets */
357 *data++ = 0xe0 | (rtph264depay->sps->len & 0x1f);
360 for (i = 0; i < rtph264depay->sps->len; i++) {
361 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
364 GST_DEBUG_OBJECT (rtph264depay, "copy SPS %d of length %u", i,
365 (guint) nalmap.size);
366 GST_WRITE_UINT16_BE (data, nalmap.size);
368 memcpy (data, nalmap.data, nalmap.size);
370 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
373 /* 8 bits numOfPictureParameterSets */
374 *data++ = rtph264depay->pps->len;
376 for (i = 0; i < rtph264depay->pps->len; i++) {
377 gst_buffer_map (g_ptr_array_index (rtph264depay->pps, i), &nalmap,
380 GST_DEBUG_OBJECT (rtph264depay, "copy PPS %d of length %u", i,
381 (guint) nalmap.size);
382 GST_WRITE_UINT16_BE (data, nalmap.size);
384 memcpy (data, nalmap.data, nalmap.size);
386 gst_buffer_unmap (g_ptr_array_index (rtph264depay->pps, i), &nalmap);
389 new_size = data - map.data;
390 gst_buffer_unmap (codec_data, &map);
391 gst_buffer_set_size (codec_data, new_size);
394 gst_caps_set_simple (srccaps,
395 "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
396 gst_buffer_unref (codec_data);
399 res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
401 gst_caps_unref (srccaps);
404 rtph264depay->new_codec_data = FALSE;
410 gst_rtp_h264_add_sps_pps (GstRtpH264Depay * rtph264depay, GstBuffer * nal)
416 gst_buffer_map (nal, &map, GST_MAP_READ);
418 type = map.data[0] & 0x1f;
423 if (!parse_sps (&map, &sps_id)) {
424 GST_WARNING_OBJECT (rtph264depay, "Invalid SPS,"
425 " can't parse seq_parameter_set_id");
429 for (i = 0; i < rtph264depay->sps->len; i++) {
430 GstBuffer *sps = g_ptr_array_index (rtph264depay->sps, i);
434 gst_buffer_map (sps, &spsmap, GST_MAP_READ);
435 parse_sps (&spsmap, &tmp_sps_id);
437 if (sps_id == tmp_sps_id) {
438 if (map.size == spsmap.size &&
439 memcmp (map.data, spsmap.data, spsmap.size) == 0) {
440 GST_LOG_OBJECT (rtph264depay, "Unchanged SPS %u, not updating",
442 gst_buffer_unmap (sps, &spsmap);
445 gst_buffer_unmap (sps, &spsmap);
446 g_ptr_array_remove_index_fast (rtph264depay->sps, i);
447 g_ptr_array_add (rtph264depay->sps, nal);
448 GST_LOG_OBJECT (rtph264depay, "Modified SPS %u, replacing", sps_id);
452 gst_buffer_unmap (sps, &spsmap);
454 GST_LOG_OBJECT (rtph264depay, "Adding new SPS %u", sps_id);
455 g_ptr_array_add (rtph264depay->sps, nal);
456 } else if (type == 8) {
460 if (!parse_pps (&map, &sps_id, &pps_id)) {
461 GST_WARNING_OBJECT (rtph264depay, "Invalid PPS,"
462 " can't parse seq_parameter_set_id or pic_parameter_set_id");
466 for (i = 0; i < rtph264depay->pps->len; i++) {
467 GstBuffer *pps = g_ptr_array_index (rtph264depay->pps, i);
473 gst_buffer_map (pps, &ppsmap, GST_MAP_READ);
474 parse_pps (&ppsmap, &tmp_sps_id, &tmp_pps_id);
476 if (sps_id == tmp_sps_id && pps_id == tmp_pps_id) {
477 if (map.size == ppsmap.size &&
478 memcmp (map.data, ppsmap.data, ppsmap.size) == 0) {
479 GST_LOG_OBJECT (rtph264depay, "Unchanged PPS %u:%u, not updating",
481 gst_buffer_unmap (pps, &ppsmap);
484 gst_buffer_unmap (pps, &ppsmap);
485 g_ptr_array_remove_index_fast (rtph264depay->pps, i);
486 g_ptr_array_add (rtph264depay->pps, nal);
487 GST_LOG_OBJECT (rtph264depay, "Modified PPS %u:%u, replacing",
492 gst_buffer_unmap (pps, &ppsmap);
494 GST_LOG_OBJECT (rtph264depay, "Adding new PPS %u:%i", sps_id, pps_id);
495 g_ptr_array_add (rtph264depay->pps, nal);
501 gst_buffer_unmap (nal, &map);
502 rtph264depay->new_codec_data = TRUE;
507 gst_buffer_unmap (nal, &map);
508 gst_buffer_unref (nal);
514 gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
517 GstStructure *structure = gst_caps_get_structure (caps, 0);
518 GstRtpH264Depay *rtph264depay;
520 GstBuffer *codec_data;
524 rtph264depay = GST_RTP_H264_DEPAY (depayload);
526 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
528 depayload->clock_rate = clock_rate;
530 /* Base64 encoded, comma separated config NALs */
531 ps = gst_structure_get_string (structure, "sprop-parameter-sets");
533 /* negotiate with downstream w.r.t. output format and alignment */
534 gst_rtp_h264_depay_negotiate (rtph264depay);
536 if (rtph264depay->byte_stream && ps != NULL) {
537 /* for bytestream we only need the parameter sets but we don't error out
538 * when they are not there, we assume they are in the stream. */
543 params = g_strsplit (ps, ",", 0);
545 /* count total number of bytes in base64. Also include the sync bytes in
546 * front of the params. */
548 for (i = 0; params[i]; i++) {
549 len += strlen (params[i]);
550 len += sizeof (sync_bytes);
552 /* we seriously overshoot the length, but it's fine. */
553 codec_data = gst_buffer_new_and_alloc (len);
555 gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
558 for (i = 0; params[i]; i++) {
562 GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
563 memcpy (ptr, sync_bytes, sizeof (sync_bytes));
564 ptr += sizeof (sync_bytes);
566 g_base64_decode_step (params[i], strlen (params[i]), ptr, &state,
568 GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
569 total += len + sizeof (sync_bytes);
572 gst_buffer_unmap (codec_data, &map);
573 gst_buffer_resize (codec_data, 0, total);
576 /* keep the codec_data, we need to send it as the first buffer. We cannot
577 * push it in the adapter because the adapter might be flushed on discont.
579 if (rtph264depay->codec_data)
580 gst_buffer_unref (rtph264depay->codec_data);
581 rtph264depay->codec_data = codec_data;
582 } else if (!rtph264depay->byte_stream) {
587 goto incomplete_caps;
589 params = g_strsplit (ps, ",", 0);
591 GST_DEBUG_OBJECT (depayload, "we have %d params", g_strv_length (params));
593 /* start with 7 bytes header */
594 for (i = 0; params[i]; i++) {
601 nal_len = strlen (params[i]);
602 nal = gst_buffer_new_and_alloc (nal_len);
603 gst_buffer_map (nal, &nalmap, GST_MAP_READWRITE);
606 g_base64_decode_step (params[i], nal_len, nalmap.data, &state, &save);
608 GST_DEBUG_OBJECT (depayload, "adding param %d as %s", i,
609 ((nalmap.data[0] & 0x1f) == 7) ? "SPS" : "PPS");
611 gst_buffer_unmap (nal, &nalmap);
612 gst_buffer_set_size (nal, nal_len);
614 gst_rtp_h264_add_sps_pps (rtph264depay, nal);
618 if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0)
619 goto incomplete_caps;
622 return gst_rtp_h264_set_src_caps (rtph264depay);
627 GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
628 " doing setcaps later");
634 gst_rtp_h264_complete_au (GstRtpH264Depay * rtph264depay,
635 GstClockTime * out_timestamp, gboolean * out_keyframe)
640 /* we had a picture in the adapter and we completed it */
641 GST_DEBUG_OBJECT (rtph264depay, "taking completed AU");
642 outsize = gst_adapter_available (rtph264depay->picture_adapter);
643 outbuf = gst_adapter_take_buffer (rtph264depay->picture_adapter, outsize);
645 *out_timestamp = rtph264depay->last_ts;
646 *out_keyframe = rtph264depay->last_keyframe;
648 rtph264depay->last_keyframe = FALSE;
649 rtph264depay->picture_start = FALSE;
654 /* SPS/PPS/IDR considered key, all others DELTA;
655 * so downstream waiting for keyframe can pick up at SPS/PPS/IDR */
656 #define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8))
659 gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
660 GstClockTime in_timestamp, gboolean marker)
662 GstRTPBaseDepayload *depayload = GST_RTP_BASE_DEPAYLOAD (rtph264depay);
665 GstBuffer *outbuf = NULL;
666 GstClockTime out_timestamp;
667 gboolean keyframe, out_keyframe;
669 gst_buffer_map (nal, &map, GST_MAP_READ);
670 if (G_UNLIKELY (map.size < 5))
673 nal_type = map.data[4] & 0x1f;
674 GST_DEBUG_OBJECT (rtph264depay, "handle NAL type %d", nal_type);
676 keyframe = NAL_TYPE_IS_KEY (nal_type);
678 out_keyframe = keyframe;
679 out_timestamp = in_timestamp;
681 if (!rtph264depay->byte_stream) {
682 if (nal_type == 7 || nal_type == 8) {
683 gst_rtp_h264_add_sps_pps (rtph264depay,
684 gst_buffer_copy_region (nal, GST_BUFFER_COPY_ALL,
685 4, gst_buffer_get_size (nal) - 4));
686 gst_buffer_unmap (nal, &map);
687 gst_buffer_unref (nal);
689 } else if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0) {
690 /* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
693 gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
694 gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
695 gst_structure_new ("GstForceKeyUnit",
696 "all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
697 gst_buffer_unmap (nal, &map);
698 gst_buffer_unref (nal);
702 if (rtph264depay->new_codec_data &&
703 rtph264depay->sps->len > 0 && rtph264depay->pps->len > 0)
704 gst_rtp_h264_set_src_caps (rtph264depay);
708 if (rtph264depay->merge) {
709 gboolean start = FALSE, complete = FALSE;
711 /* consider a coded slices (IDR or not) to start a picture,
712 * (so ending the previous one) if first_mb_in_slice == 0
713 * (non-0 is part of previous one) */
714 /* NOTE this is not entirely according to Access Unit specs in 7.4.1.2.4,
715 * but in practice it works in sane cases, needs not much parsing,
716 * and also works with broken frame_num in NAL (where spec-wise would fail) */
717 if (nal_type == 1 || nal_type == 2 || nal_type == 5) {
718 /* we have a picture start */
720 if (map.data[5] & 0x80) {
721 /* first_mb_in_slice == 0 completes a picture */
724 } else if (nal_type >= 6 && nal_type <= 9) {
725 /* SEI, SPS, PPS, AU terminate picture */
728 GST_DEBUG_OBJECT (depayload, "start %d, complete %d", start, complete);
730 if (complete && rtph264depay->picture_start)
731 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
735 gst_buffer_unmap (nal, &map);
737 GST_DEBUG_OBJECT (depayload, "adding NAL to picture adapter");
738 gst_adapter_push (rtph264depay->picture_adapter, nal);
739 rtph264depay->last_ts = in_timestamp;
740 rtph264depay->last_keyframe |= keyframe;
741 rtph264depay->picture_start |= start;
744 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
747 /* no merge, output is input nal */
748 GST_DEBUG_OBJECT (depayload, "using NAL as output");
750 gst_buffer_unmap (nal, &map);
754 /* prepend codec_data */
755 if (rtph264depay->codec_data) {
756 GST_DEBUG_OBJECT (depayload, "prepending codec_data");
757 outbuf = gst_buffer_append (rtph264depay->codec_data, outbuf);
758 rtph264depay->codec_data = NULL;
761 outbuf = gst_buffer_make_writable (outbuf);
763 GST_BUFFER_TIMESTAMP (outbuf) = out_timestamp;
766 GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
768 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
776 GST_WARNING_OBJECT (depayload, "dropping short NAL");
777 gst_buffer_unmap (nal, &map);
778 gst_buffer_unref (nal);
784 gst_rtp_h264_push_fragmentation_unit (GstRtpH264Depay * rtph264depay,
791 outsize = gst_adapter_available (rtph264depay->adapter);
792 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
794 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
795 GST_DEBUG_OBJECT (rtph264depay, "output %d bytes", outsize);
797 if (rtph264depay->byte_stream) {
798 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
801 map.data[0] = (outsize >> 24);
802 map.data[1] = (outsize >> 16);
803 map.data[2] = (outsize >> 8);
804 map.data[3] = (outsize);
806 gst_buffer_unmap (outbuf, &map);
808 rtph264depay->current_fu_type = 0;
810 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf,
811 rtph264depay->fu_timestamp, rtph264depay->fu_marker);
813 if (send && outbuf) {
814 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph264depay), outbuf);
821 gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
823 GstRtpH264Depay *rtph264depay;
824 GstBuffer *outbuf = NULL;
825 guint8 nal_unit_type;
826 GstRTPBuffer rtp = { NULL };
828 rtph264depay = GST_RTP_H264_DEPAY (depayload);
830 /* flush remaining data on discont */
831 if (GST_BUFFER_IS_DISCONT (buf)) {
832 gst_adapter_clear (rtph264depay->adapter);
833 rtph264depay->wait_start = TRUE;
834 rtph264depay->current_fu_type = 0;
843 guint outsize, nalu_size;
844 GstClockTime timestamp;
847 timestamp = GST_BUFFER_TIMESTAMP (buf);
849 gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
851 payload_len = gst_rtp_buffer_get_payload_len (&rtp);
852 payload = gst_rtp_buffer_get_payload (&rtp);
853 marker = gst_rtp_buffer_get_marker (&rtp);
855 GST_DEBUG_OBJECT (rtph264depay, "receiving %d bytes", payload_len);
857 if (payload_len == 0)
868 nal_ref_idc = (payload[0] & 0x60) >> 5;
869 nal_unit_type = payload[0] & 0x1f;
871 /* at least one byte header with type */
874 GST_DEBUG_OBJECT (rtph264depay, "NRI %d, Type %d", nal_ref_idc,
877 /* If FU unit was being processed, but the current nal is of a different
878 * type. Assume that the remote payloader is buggy (didn't set the end bit
879 * when the FU ended) and send out what we gathered thusfar */
880 if (G_UNLIKELY (rtph264depay->current_fu_type != 0 &&
881 nal_unit_type != rtph264depay->current_fu_type))
882 gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
884 switch (nal_unit_type) {
891 /* STAP-B Single-time aggregation packet 5.7.1 */
892 /* 2 byte extra header for DON */
898 payload += header_len;
899 payload_len -= header_len;
901 rtph264depay->wait_start = FALSE;
904 /* STAP-A Single-time aggregation packet 5.7.1 */
905 while (payload_len > 2) {
907 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
908 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
910 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
912 nalu_size = (payload[0] << 8) | payload[1];
914 /* dont include nalu_size */
915 if (nalu_size > (payload_len - 2))
916 nalu_size = payload_len - 2;
918 outsize = nalu_size + sizeof (sync_bytes);
919 outbuf = gst_buffer_new_and_alloc (outsize);
921 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
922 if (rtph264depay->byte_stream) {
923 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
925 map.data[0] = map.data[1] = 0;
926 map.data[2] = payload[0];
927 map.data[3] = payload[1];
930 /* strip NALU size */
934 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
935 gst_buffer_unmap (outbuf, &map);
937 gst_adapter_push (rtph264depay->adapter, outbuf);
939 payload += nalu_size;
940 payload_len -= nalu_size;
943 outsize = gst_adapter_available (rtph264depay->adapter);
944 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
946 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
951 /* MTAP16 Multi-time aggregation packet 5.7.2 */
953 /* fallthrough, not implemented */
955 /* MTAP24 Multi-time aggregation packet 5.7.2 */
957 goto not_implemented;
962 /* FU-A Fragmentation unit 5.8 */
963 /* FU-B Fragmentation unit 5.8 */
972 * R is reserved and always 0
974 S = (payload[1] & 0x80) == 0x80;
975 E = (payload[1] & 0x40) == 0x40;
977 GST_DEBUG_OBJECT (rtph264depay, "S %d, E %d", S, E);
979 if (rtph264depay->wait_start && !S)
983 /* NAL unit starts here */
986 /* If a new FU unit started, while still processing an older one.
987 * Assume that the remote payloader is buggy (doesn't set the end
988 * bit) and send out what we've gathered thusfar */
989 if (G_UNLIKELY (rtph264depay->current_fu_type != 0))
990 gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
992 rtph264depay->current_fu_type = nal_unit_type;
993 rtph264depay->fu_timestamp = timestamp;
995 rtph264depay->wait_start = FALSE;
997 /* reconstruct NAL header */
998 nal_header = (payload[0] & 0xe0) | (payload[1] & 0x1f);
1000 /* strip type header, keep FU header, we'll reuse it to reconstruct
1001 * the NAL header. */
1005 nalu_size = payload_len;
1006 outsize = nalu_size + sizeof (sync_bytes);
1007 outbuf = gst_buffer_new_and_alloc (outsize);
1009 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1010 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1011 map.data[sizeof (sync_bytes)] = nal_header;
1012 gst_buffer_unmap (outbuf, &map);
1014 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1016 /* and assemble in the adapter */
1017 gst_adapter_push (rtph264depay->adapter, outbuf);
1019 /* strip off FU indicator and FU header bytes */
1023 outsize = payload_len;
1024 outbuf = gst_buffer_new_and_alloc (outsize);
1025 gst_buffer_fill (outbuf, 0, payload, outsize);
1027 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1029 /* and assemble in the adapter */
1030 gst_adapter_push (rtph264depay->adapter, outbuf);
1034 rtph264depay->fu_marker = marker;
1036 /* if NAL unit ends, flush the adapter */
1038 outbuf = gst_rtp_h264_push_fragmentation_unit (rtph264depay, FALSE);
1043 rtph264depay->wait_start = FALSE;
1045 /* 1-23 NAL unit Single NAL unit packet per H.264 5.6 */
1046 /* the entire payload is the output buffer */
1047 nalu_size = payload_len;
1048 outsize = nalu_size + sizeof (sync_bytes);
1049 outbuf = gst_buffer_new_and_alloc (outsize);
1051 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1052 if (rtph264depay->byte_stream) {
1053 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1055 map.data[0] = map.data[1] = 0;
1056 map.data[2] = nalu_size >> 8;
1057 map.data[3] = nalu_size & 0xff;
1059 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1060 gst_buffer_unmap (outbuf, &map);
1062 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1067 gst_rtp_buffer_unmap (&rtp);
1075 GST_DEBUG_OBJECT (rtph264depay, "empty packet");
1076 gst_rtp_buffer_unmap (&rtp);
1081 GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
1082 (NULL), ("Undefined packet type"));
1083 gst_rtp_buffer_unmap (&rtp);
1088 GST_DEBUG_OBJECT (rtph264depay, "waiting for start");
1089 gst_rtp_buffer_unmap (&rtp);
1094 GST_ELEMENT_ERROR (rtph264depay, STREAM, FORMAT,
1095 (NULL), ("NAL unit type %d not supported yet", nal_unit_type));
1096 gst_rtp_buffer_unmap (&rtp);
1102 gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
1104 GstRtpH264Depay *rtph264depay;
1106 rtph264depay = GST_RTP_H264_DEPAY (depay);
1108 switch (GST_EVENT_TYPE (event)) {
1109 case GST_EVENT_FLUSH_STOP:
1110 gst_rtp_h264_depay_reset (rtph264depay);
1117 GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (depay, event);
1120 static GstStateChangeReturn
1121 gst_rtp_h264_depay_change_state (GstElement * element,
1122 GstStateChange transition)
1124 GstRtpH264Depay *rtph264depay;
1125 GstStateChangeReturn ret;
1127 rtph264depay = GST_RTP_H264_DEPAY (element);
1129 switch (transition) {
1130 case GST_STATE_CHANGE_NULL_TO_READY:
1132 case GST_STATE_CHANGE_READY_TO_PAUSED:
1133 gst_rtp_h264_depay_reset (rtph264depay);
1139 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1141 switch (transition) {
1142 case GST_STATE_CHANGE_READY_TO_NULL:
1151 gst_rtp_h264_depay_plugin_init (GstPlugin * plugin)
1153 return gst_element_register (plugin, "rtph264depay",
1154 GST_RANK_SECONDARY, GST_TYPE_RTP_H264_DEPAY);