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_pad_template (gstelement_class,
111 gst_static_pad_template_get (&gst_rtp_h264_depay_src_template));
112 gst_element_class_add_pad_template (gstelement_class,
113 gst_static_pad_template_get (&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;
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 if (!rtph264depay->byte_stream &&
297 (!rtph264depay->new_codec_data ||
298 rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0))
301 srccaps = gst_caps_new_simple ("video/x-h264",
302 "stream-format", G_TYPE_STRING,
303 rtph264depay->byte_stream ? "byte-stream" : "avc",
304 "alignment", G_TYPE_STRING, rtph264depay->merge ? "au" : "nal", NULL);
306 if (!rtph264depay->byte_stream) {
307 GstBuffer *codec_data;
315 guchar profile_compat = G_MAXUINT8;
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);
392 gst_caps_set_simple (srccaps,
393 "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
394 gst_buffer_unref (codec_data);
397 /* Set profile a level from SPS */
400 GstBuffer *max_level_sps = NULL;
404 /* Get the SPS with the highest level. We assume
405 * all SPS have the same profile */
406 for (i = 0; i < rtph264depay->sps->len; i++) {
407 gst_buffer_map (g_ptr_array_index (rtph264depay->sps, i), &nalmap,
409 if (level == 0 || level < nalmap.data[3]) {
410 max_level_sps = g_ptr_array_index (rtph264depay->sps, i);
411 level = nalmap.data[3];
413 gst_buffer_unmap (g_ptr_array_index (rtph264depay->sps, i), &nalmap);
417 gst_buffer_map (max_level_sps, &nalmap, GST_MAP_READ);
418 gst_codec_utils_h264_caps_set_level_and_profile (srccaps, nalmap.data + 1,
420 gst_buffer_unmap (max_level_sps, &nalmap);
425 if (gst_pad_has_current_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay))) {
427 gst_pad_get_current_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay));
429 /* Only update the caps if they are not equal. For
430 * AVC we don't update caps if only the codec_data
431 * changes. This is the same behaviour as in h264parse
433 if (rtph264depay->byte_stream) {
434 if (!gst_caps_is_equal (srccaps, old_caps))
436 gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
441 GstCaps *tmp_caps = gst_caps_copy (srccaps);
442 GstStructure *old_s, *tmp_s;
444 old_s = gst_caps_get_structure (old_caps, 0);
445 tmp_s = gst_caps_get_structure (tmp_caps, 0);
446 if (gst_structure_has_field (old_s, "codec_data"))
447 gst_structure_set_value (tmp_s, "codec_data",
448 gst_structure_get_value (old_s, "codec_data"));
450 if (!gst_caps_is_equal (old_caps, tmp_caps))
452 gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
457 gst_caps_unref (tmp_caps);
461 gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph264depay),
465 gst_caps_unref (srccaps);
467 /* Insert SPS and PPS into the stream on next opportunity */
468 if (rtph264depay->sps->len > 0 || rtph264depay->pps->len > 0) {
470 GstBuffer *codec_data;
475 for (i = 0; i < rtph264depay->sps->len; i++) {
476 len += 4 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->sps, i));
479 for (i = 0; i < rtph264depay->pps->len; i++) {
480 len += 4 + gst_buffer_get_size (g_ptr_array_index (rtph264depay->pps, i));
483 codec_data = gst_buffer_new_and_alloc (len);
484 gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
487 for (i = 0; i < rtph264depay->sps->len; i++) {
488 GstBuffer *sps_buf = g_ptr_array_index (rtph264depay->sps, i);
489 guint sps_size = gst_buffer_get_size (sps_buf);
491 if (rtph264depay->byte_stream)
492 memcpy (data, sync_bytes, sizeof (sync_bytes));
494 GST_WRITE_UINT32_BE (data, sps_size);
495 gst_buffer_extract (sps_buf, 0, data + 4, -1);
496 data += 4 + sps_size;
499 for (i = 0; i < rtph264depay->pps->len; i++) {
500 GstBuffer *pps_buf = g_ptr_array_index (rtph264depay->pps, i);
501 guint pps_size = gst_buffer_get_size (pps_buf);
503 if (rtph264depay->byte_stream)
504 memcpy (data, sync_bytes, sizeof (sync_bytes));
506 GST_WRITE_UINT32_BE (data, pps_size);
507 gst_buffer_extract (pps_buf, 0, data + 4, -1);
508 data += 4 + pps_size;
511 gst_buffer_unmap (codec_data, &map);
512 if (rtph264depay->codec_data)
513 gst_buffer_unref (rtph264depay->codec_data);
514 rtph264depay->codec_data = codec_data;
518 rtph264depay->new_codec_data = FALSE;
524 gst_rtp_h264_add_sps_pps (GstElement * rtph264, GPtrArray * sps_array,
525 GPtrArray * pps_array, GstBuffer * nal)
531 gst_buffer_map (nal, &map, GST_MAP_READ);
533 type = map.data[0] & 0x1f;
538 if (!parse_sps (&map, &sps_id)) {
539 GST_WARNING_OBJECT (rtph264, "Invalid SPS,"
540 " can't parse seq_parameter_set_id");
544 for (i = 0; i < sps_array->len; i++) {
545 GstBuffer *sps = g_ptr_array_index (sps_array, i);
549 gst_buffer_map (sps, &spsmap, GST_MAP_READ);
550 parse_sps (&spsmap, &tmp_sps_id);
552 if (sps_id == tmp_sps_id) {
553 if (map.size == spsmap.size &&
554 memcmp (map.data, spsmap.data, spsmap.size) == 0) {
555 GST_LOG_OBJECT (rtph264, "Unchanged SPS %u, not updating", sps_id);
556 gst_buffer_unmap (sps, &spsmap);
559 gst_buffer_unmap (sps, &spsmap);
560 g_ptr_array_remove_index_fast (sps_array, i);
561 g_ptr_array_add (sps_array, nal);
562 GST_LOG_OBJECT (rtph264, "Modified SPS %u, replacing", sps_id);
566 gst_buffer_unmap (sps, &spsmap);
568 GST_LOG_OBJECT (rtph264, "Adding new SPS %u", sps_id);
569 g_ptr_array_add (sps_array, nal);
570 } else if (type == 8) {
574 if (!parse_pps (&map, &sps_id, &pps_id)) {
575 GST_WARNING_OBJECT (rtph264, "Invalid PPS,"
576 " can't parse seq_parameter_set_id or pic_parameter_set_id");
580 for (i = 0; i < pps_array->len; i++) {
581 GstBuffer *pps = g_ptr_array_index (pps_array, i);
587 gst_buffer_map (pps, &ppsmap, GST_MAP_READ);
588 parse_pps (&ppsmap, &tmp_sps_id, &tmp_pps_id);
590 if (pps_id == tmp_pps_id) {
591 if (map.size == ppsmap.size &&
592 memcmp (map.data, ppsmap.data, ppsmap.size) == 0) {
593 GST_LOG_OBJECT (rtph264, "Unchanged PPS %u:%u, not updating", sps_id,
595 gst_buffer_unmap (pps, &ppsmap);
598 gst_buffer_unmap (pps, &ppsmap);
599 g_ptr_array_remove_index_fast (pps_array, i);
600 g_ptr_array_add (pps_array, nal);
601 GST_LOG_OBJECT (rtph264, "Modified PPS %u:%u, replacing",
606 gst_buffer_unmap (pps, &ppsmap);
608 GST_LOG_OBJECT (rtph264, "Adding new PPS %u:%i", sps_id, pps_id);
609 g_ptr_array_add (pps_array, nal);
615 gst_buffer_unmap (nal, &map);
620 gst_buffer_unmap (nal, &map);
621 gst_buffer_unref (nal);
628 gst_rtp_h264_depay_add_sps_pps (GstRtpH264Depay * rtph264depay, GstBuffer * nal)
630 if (gst_rtp_h264_add_sps_pps (GST_ELEMENT (rtph264depay),
631 rtph264depay->sps, rtph264depay->pps, nal))
632 rtph264depay->new_codec_data = TRUE;
636 gst_rtp_h264_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
639 GstStructure *structure = gst_caps_get_structure (caps, 0);
640 GstRtpH264Depay *rtph264depay;
642 GstBuffer *codec_data;
646 rtph264depay = GST_RTP_H264_DEPAY (depayload);
648 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
650 depayload->clock_rate = clock_rate;
652 /* Base64 encoded, comma separated config NALs */
653 ps = gst_structure_get_string (structure, "sprop-parameter-sets");
655 /* negotiate with downstream w.r.t. output format and alignment */
656 gst_rtp_h264_depay_negotiate (rtph264depay);
658 if (rtph264depay->byte_stream && ps != NULL) {
659 /* for bytestream we only need the parameter sets but we don't error out
660 * when they are not there, we assume they are in the stream. */
665 params = g_strsplit (ps, ",", 0);
667 /* count total number of bytes in base64. Also include the sync bytes in
668 * front of the params. */
670 for (i = 0; params[i]; i++) {
671 len += strlen (params[i]);
672 len += sizeof (sync_bytes);
674 /* we seriously overshoot the length, but it's fine. */
675 codec_data = gst_buffer_new_and_alloc (len);
677 gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
680 for (i = 0; params[i]; i++) {
684 GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
685 memcpy (ptr, sync_bytes, sizeof (sync_bytes));
686 ptr += sizeof (sync_bytes);
688 g_base64_decode_step (params[i], strlen (params[i]), ptr, &state,
690 GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
691 total += len + sizeof (sync_bytes);
694 gst_buffer_unmap (codec_data, &map);
695 gst_buffer_resize (codec_data, 0, total);
698 /* keep the codec_data, we need to send it as the first buffer. We cannot
699 * push it in the adapter because the adapter might be flushed on discont.
701 if (rtph264depay->codec_data)
702 gst_buffer_unref (rtph264depay->codec_data);
703 rtph264depay->codec_data = codec_data;
704 } else if (!rtph264depay->byte_stream) {
709 goto incomplete_caps;
711 params = g_strsplit (ps, ",", 0);
713 GST_DEBUG_OBJECT (depayload, "we have %d params", g_strv_length (params));
715 /* start with 7 bytes header */
716 for (i = 0; params[i]; i++) {
723 nal_len = strlen (params[i]);
724 nal = gst_buffer_new_and_alloc (nal_len);
725 gst_buffer_map (nal, &nalmap, GST_MAP_READWRITE);
728 g_base64_decode_step (params[i], nal_len, nalmap.data, &state, &save);
730 GST_DEBUG_OBJECT (depayload, "adding param %d as %s", i,
731 ((nalmap.data[0] & 0x1f) == 7) ? "SPS" : "PPS");
733 gst_buffer_unmap (nal, &nalmap);
734 gst_buffer_set_size (nal, nal_len);
736 gst_rtp_h264_depay_add_sps_pps (rtph264depay, nal);
740 if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0)
741 goto incomplete_caps;
744 return gst_rtp_h264_set_src_caps (rtph264depay);
749 GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
750 " doing setcaps later");
756 gst_rtp_h264_complete_au (GstRtpH264Depay * rtph264depay,
757 GstClockTime * out_timestamp, gboolean * out_keyframe)
762 /* we had a picture in the adapter and we completed it */
763 GST_DEBUG_OBJECT (rtph264depay, "taking completed AU");
764 outsize = gst_adapter_available (rtph264depay->picture_adapter);
765 outbuf = gst_adapter_take_buffer (rtph264depay->picture_adapter, outsize);
767 *out_timestamp = rtph264depay->last_ts;
768 *out_keyframe = rtph264depay->last_keyframe;
770 rtph264depay->last_keyframe = FALSE;
771 rtph264depay->picture_start = FALSE;
776 /* SPS/PPS/IDR considered key, all others DELTA;
777 * so downstream waiting for keyframe can pick up at SPS/PPS/IDR */
778 #define NAL_TYPE_IS_KEY(nt) (((nt) == 5) || ((nt) == 7) || ((nt) == 8))
781 gst_rtp_h264_depay_handle_nal (GstRtpH264Depay * rtph264depay, GstBuffer * nal,
782 GstClockTime in_timestamp, gboolean marker)
784 GstRTPBaseDepayload *depayload = GST_RTP_BASE_DEPAYLOAD (rtph264depay);
787 GstBuffer *outbuf = NULL;
788 GstClockTime out_timestamp;
789 gboolean keyframe, out_keyframe;
791 gst_buffer_map (nal, &map, GST_MAP_READ);
792 if (G_UNLIKELY (map.size < 5))
795 nal_type = map.data[4] & 0x1f;
796 GST_DEBUG_OBJECT (rtph264depay, "handle NAL type %d", nal_type);
798 keyframe = NAL_TYPE_IS_KEY (nal_type);
800 out_keyframe = keyframe;
801 out_timestamp = in_timestamp;
803 if (!rtph264depay->byte_stream) {
804 if (nal_type == 7 || nal_type == 8) {
805 gst_rtp_h264_depay_add_sps_pps (rtph264depay,
806 gst_buffer_copy_region (nal, GST_BUFFER_COPY_ALL,
807 4, gst_buffer_get_size (nal) - 4));
808 gst_buffer_unmap (nal, &map);
809 gst_buffer_unref (nal);
811 } else if (rtph264depay->sps->len == 0 || rtph264depay->pps->len == 0) {
812 /* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
815 gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
816 gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
817 gst_structure_new ("GstForceKeyUnit",
818 "all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
819 gst_buffer_unmap (nal, &map);
820 gst_buffer_unref (nal);
824 if (rtph264depay->new_codec_data &&
825 rtph264depay->sps->len > 0 && rtph264depay->pps->len > 0)
826 gst_rtp_h264_set_src_caps (rtph264depay);
830 if (rtph264depay->merge) {
831 gboolean start = FALSE, complete = FALSE;
833 /* marker bit isn't mandatory so in the following code we try to guess
834 * an AU boundary by detecting a new picture start */
836 /* consider a coded slices (IDR or not) to start a picture,
837 * (so ending the previous one) if first_mb_in_slice == 0
838 * (non-0 is part of previous one) */
839 /* NOTE this is not entirely according to Access Unit specs in 7.4.1.2.4,
840 * but in practice it works in sane cases, needs not much parsing,
841 * and also works with broken frame_num in NAL (where spec-wise would fail) */
842 /* FIXME: this code isn't correct for interlaced content as AUs should be
843 * constructed with pairs of fields and the guess here will just push out
844 * AUs with a single field in it */
845 if (nal_type == 1 || nal_type == 2 || nal_type == 5) {
846 /* we have a picture start */
848 if (map.data[5] & 0x80) {
849 /* first_mb_in_slice == 0 completes a picture */
852 } else if (nal_type >= 6 && nal_type <= 9) {
853 /* SEI, SPS, PPS, AU terminate picture */
856 GST_DEBUG_OBJECT (depayload, "start %d, complete %d", start, complete);
858 if (complete && rtph264depay->picture_start)
859 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
863 gst_buffer_unmap (nal, &map);
865 GST_DEBUG_OBJECT (depayload, "adding NAL to picture adapter");
866 gst_adapter_push (rtph264depay->picture_adapter, nal);
867 rtph264depay->last_ts = in_timestamp;
868 rtph264depay->last_keyframe |= keyframe;
869 rtph264depay->picture_start |= start;
872 outbuf = gst_rtp_h264_complete_au (rtph264depay, &out_timestamp,
875 /* no merge, output is input nal */
876 GST_DEBUG_OBJECT (depayload, "using NAL as output");
878 gst_buffer_unmap (nal, &map);
882 /* prepend codec_data */
883 if (rtph264depay->codec_data) {
884 GST_DEBUG_OBJECT (depayload, "prepending codec_data");
885 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay),
886 rtph264depay->codec_data, outbuf,
887 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
888 outbuf = gst_buffer_append (rtph264depay->codec_data, outbuf);
889 rtph264depay->codec_data = NULL;
892 outbuf = gst_buffer_make_writable (outbuf);
894 gst_rtp_drop_meta (GST_ELEMENT_CAST (rtph264depay), outbuf,
895 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
897 GST_BUFFER_PTS (outbuf) = out_timestamp;
900 GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
902 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
910 GST_WARNING_OBJECT (depayload, "dropping short NAL");
911 gst_buffer_unmap (nal, &map);
912 gst_buffer_unref (nal);
918 gst_rtp_h264_push_fragmentation_unit (GstRtpH264Depay * rtph264depay,
925 outsize = gst_adapter_available (rtph264depay->adapter);
926 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
928 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
929 GST_DEBUG_OBJECT (rtph264depay, "output %d bytes", outsize);
931 if (rtph264depay->byte_stream) {
932 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
935 map.data[0] = (outsize >> 24);
936 map.data[1] = (outsize >> 16);
937 map.data[2] = (outsize >> 8);
938 map.data[3] = (outsize);
940 gst_buffer_unmap (outbuf, &map);
942 rtph264depay->current_fu_type = 0;
944 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf,
945 rtph264depay->fu_timestamp, rtph264depay->fu_marker);
947 if (send && outbuf) {
948 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph264depay), outbuf);
955 gst_rtp_h264_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
957 GstRtpH264Depay *rtph264depay;
959 GstBuffer *outbuf = NULL;
960 guint8 nal_unit_type;
962 rtph264depay = GST_RTP_H264_DEPAY (depayload);
964 /* flush remaining data on discont */
965 if (GST_BUFFER_IS_DISCONT (rtp->buffer)) {
966 gst_adapter_clear (rtph264depay->adapter);
967 rtph264depay->wait_start = TRUE;
968 rtph264depay->current_fu_type = 0;
977 guint outsize, nalu_size;
978 GstClockTime timestamp;
981 timestamp = GST_BUFFER_PTS (rtp->buffer);
983 payload_len = gst_rtp_buffer_get_payload_len (rtp);
984 payload = gst_rtp_buffer_get_payload (rtp);
985 buf = gst_rtp_buffer_get_payload_buffer (rtp);
986 marker = gst_rtp_buffer_get_marker (rtp);
988 GST_DEBUG_OBJECT (rtph264depay, "receiving %d bytes", payload_len);
990 if (payload_len == 0)
1001 nal_ref_idc = (payload[0] & 0x60) >> 5;
1002 nal_unit_type = payload[0] & 0x1f;
1004 /* at least one byte header with type */
1007 GST_DEBUG_OBJECT (rtph264depay, "NRI %d, Type %d", nal_ref_idc,
1010 /* If FU unit was being processed, but the current nal is of a different
1011 * type. Assume that the remote payloader is buggy (didn't set the end bit
1012 * when the FU ended) and send out what we gathered thusfar */
1013 if (G_UNLIKELY (rtph264depay->current_fu_type != 0 &&
1014 nal_unit_type != rtph264depay->current_fu_type))
1015 gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
1017 switch (nal_unit_type) {
1022 goto undefined_type;
1024 /* STAP-B Single-time aggregation packet 5.7.1 */
1025 /* 2 byte extra header for DON */
1031 payload += header_len;
1032 payload_len -= header_len;
1034 rtph264depay->wait_start = FALSE;
1037 /* STAP-A Single-time aggregation packet 5.7.1 */
1038 while (payload_len > 2) {
1040 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
1041 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1043 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1045 nalu_size = (payload[0] << 8) | payload[1];
1047 /* dont include nalu_size */
1048 if (nalu_size > (payload_len - 2))
1049 nalu_size = payload_len - 2;
1051 outsize = nalu_size + sizeof (sync_bytes);
1052 outbuf = gst_buffer_new_and_alloc (outsize);
1054 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1055 if (rtph264depay->byte_stream) {
1056 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1058 map.data[0] = map.data[1] = 0;
1059 map.data[2] = payload[0];
1060 map.data[3] = payload[1];
1063 /* strip NALU size */
1067 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1068 gst_buffer_unmap (outbuf, &map);
1070 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay), outbuf, buf,
1071 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
1074 gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1077 gst_adapter_push (rtph264depay->adapter, outbuf);
1079 payload += nalu_size;
1080 payload_len -= nalu_size;
1083 outsize = gst_adapter_available (rtph264depay->adapter);
1085 outbuf = gst_adapter_take_buffer (rtph264depay->adapter, outsize);
1087 gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1093 /* MTAP16 Multi-time aggregation packet 5.7.2 */
1095 /* fallthrough, not implemented */
1097 /* MTAP24 Multi-time aggregation packet 5.7.2 */
1099 goto not_implemented;
1104 /* FU-A Fragmentation unit 5.8 */
1105 /* FU-B Fragmentation unit 5.8 */
1108 /* +---------------+
1114 * R is reserved and always 0
1116 S = (payload[1] & 0x80) == 0x80;
1117 E = (payload[1] & 0x40) == 0x40;
1119 GST_DEBUG_OBJECT (rtph264depay, "S %d, E %d", S, E);
1121 if (rtph264depay->wait_start && !S)
1125 /* NAL unit starts here */
1128 /* If a new FU unit started, while still processing an older one.
1129 * Assume that the remote payloader is buggy (doesn't set the end
1130 * bit) and send out what we've gathered thusfar */
1131 if (G_UNLIKELY (rtph264depay->current_fu_type != 0))
1132 gst_rtp_h264_push_fragmentation_unit (rtph264depay, TRUE);
1134 rtph264depay->current_fu_type = nal_unit_type;
1135 rtph264depay->fu_timestamp = timestamp;
1137 rtph264depay->wait_start = FALSE;
1139 /* reconstruct NAL header */
1140 nal_header = (payload[0] & 0xe0) | (payload[1] & 0x1f);
1142 /* strip type header, keep FU header, we'll reuse it to reconstruct
1143 * the NAL header. */
1147 nalu_size = payload_len;
1148 outsize = nalu_size + sizeof (sync_bytes);
1149 outbuf = gst_buffer_new_and_alloc (outsize);
1151 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1152 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1153 map.data[sizeof (sync_bytes)] = nal_header;
1154 gst_buffer_unmap (outbuf, &map);
1156 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay), outbuf, buf,
1157 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
1159 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1161 /* and assemble in the adapter */
1162 gst_adapter_push (rtph264depay->adapter, outbuf);
1164 /* strip off FU indicator and FU header bytes */
1168 outsize = payload_len;
1169 outbuf = gst_buffer_new_and_alloc (outsize);
1170 gst_buffer_fill (outbuf, 0, payload, outsize);
1172 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay), outbuf, buf,
1173 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
1175 GST_DEBUG_OBJECT (rtph264depay, "queueing %d bytes", outsize);
1177 /* and assemble in the adapter */
1178 gst_adapter_push (rtph264depay->adapter, outbuf);
1182 rtph264depay->fu_marker = marker;
1184 /* if NAL unit ends, flush the adapter */
1186 outbuf = gst_rtp_h264_push_fragmentation_unit (rtph264depay, FALSE);
1191 rtph264depay->wait_start = FALSE;
1193 /* 1-23 NAL unit Single NAL unit packet per H.264 5.6 */
1194 /* the entire payload is the output buffer */
1195 nalu_size = payload_len;
1196 outsize = nalu_size + sizeof (sync_bytes);
1197 outbuf = gst_buffer_new_and_alloc (outsize);
1199 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
1200 if (rtph264depay->byte_stream) {
1201 memcpy (map.data, sync_bytes, sizeof (sync_bytes));
1203 map.data[0] = map.data[1] = 0;
1204 map.data[2] = nalu_size >> 8;
1205 map.data[3] = nalu_size & 0xff;
1207 memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
1208 gst_buffer_unmap (outbuf, &map);
1210 gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph264depay), outbuf, buf,
1211 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
1213 outbuf = gst_rtp_h264_depay_handle_nal (rtph264depay, outbuf, timestamp,
1220 gst_buffer_unref (buf);
1227 GST_DEBUG_OBJECT (rtph264depay, "empty packet");
1228 gst_buffer_unref (buf);
1233 GST_ELEMENT_WARNING (rtph264depay, STREAM, DECODE,
1234 (NULL), ("Undefined packet type"));
1235 gst_buffer_unref (buf);
1240 GST_DEBUG_OBJECT (rtph264depay, "waiting for start");
1241 gst_buffer_unref (buf);
1246 GST_ELEMENT_ERROR (rtph264depay, STREAM, FORMAT,
1247 (NULL), ("NAL unit type %d not supported yet", nal_unit_type));
1248 gst_buffer_unref (buf);
1254 gst_rtp_h264_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
1256 GstRtpH264Depay *rtph264depay;
1258 rtph264depay = GST_RTP_H264_DEPAY (depay);
1260 switch (GST_EVENT_TYPE (event)) {
1261 case GST_EVENT_FLUSH_STOP:
1262 gst_rtp_h264_depay_reset (rtph264depay);
1269 GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (depay, event);
1272 static GstStateChangeReturn
1273 gst_rtp_h264_depay_change_state (GstElement * element,
1274 GstStateChange transition)
1276 GstRtpH264Depay *rtph264depay;
1277 GstStateChangeReturn ret;
1279 rtph264depay = GST_RTP_H264_DEPAY (element);
1281 switch (transition) {
1282 case GST_STATE_CHANGE_NULL_TO_READY:
1284 case GST_STATE_CHANGE_READY_TO_PAUSED:
1285 gst_rtp_h264_depay_reset (rtph264depay);
1291 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1293 switch (transition) {
1294 case GST_STATE_CHANGE_READY_TO_NULL:
1303 gst_rtp_h264_depay_plugin_init (GstPlugin * plugin)
1305 GST_DEBUG_CATEGORY_INIT (rtph264depay_debug, "rtph264depay", 0,
1306 "H264 Video RTP Depayloader");
1308 return gst_element_register (plugin, "rtph264depay",
1309 GST_RANK_SECONDARY, GST_TYPE_RTP_H264_DEPAY);