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gstreamer/gst/rtp/gstrtph265depay.c
Nirbheek Chauhan 95f6c31c21 rtph265depay: update codec_data in caps regardless of format 
Updating of codec_data in the caps is important to propagate changes
in sps/pps/vps via NALs. Without this, downstream does not renegotiate
when upstream changes resolution.

The comment referring to rtph264pay is from 2015 and is out of date.
rtph264pay stopped doing that in 2017 with commit
dabeed52a9

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/1011>
2021-06-16 16:35:07 +05:30

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/* GStreamer
* Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.com>
* Copyright (C) <2014> Jurgen Slowack <jurgenslowack@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <gst/base/gstbitreader.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/video/video.h>
#include "gstrtpelements.h"
#include "gstrtph265depay.h"
#include "gstrtputils.h"
GST_DEBUG_CATEGORY_STATIC (rtph265depay_debug);
#define GST_CAT_DEFAULT (rtph265depay_debug)
/* This is what we'll default to when downstream hasn't
* expressed a restriction or preference via caps */
#define DEFAULT_STREAM_FORMAT GST_H265_STREAM_FORMAT_BYTESTREAM
#define DEFAULT_ACCESS_UNIT FALSE
/* 3 zero bytes syncword */
static const guint8 sync_bytes[] = { 0, 0, 0, 1 };
static GstStaticPadTemplate gst_rtp_h265_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS
("video/x-h265, stream-format=(string)hvc1, alignment=(string)au; "
/* FIXME: hev1 format is not supported yet */
/* "video/x-h265, "
"stream-format = (string) hev1, alignment = (string) au; " */
"video/x-h265, "
"stream-format = (string) byte-stream, alignment = (string) { nal, au }")
);
static GstStaticPadTemplate gst_rtp_h265_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"video\", "
"clock-rate = (int) 90000, " "encoding-name = (string) \"H265\"")
/* optional parameters */
/* "profile-space = (int) [ 0, 3 ], " */
/* "profile-id = (int) [ 0, 31 ], " */
/* "tier-flag = (int) [ 0, 1 ], " */
/* "level-id = (int) [ 0, 255 ], " */
/* "interop-constraints = (string) ANY, " */
/* "profile-compatibility-indicator = (string) ANY, " */
/* "sprop-sub-layer-id = (int) [ 0, 6 ], " */
/* "recv-sub-layer-id = (int) [ 0, 6 ], " */
/* "max-recv-level-id = (int) [ 0, 255 ], " */
/* "tx-mode = (string) {MST , SST}, " */
/* "sprop-vps = (string) ANY, " */
/* "sprop-sps = (string) ANY, " */
/* "sprop-pps = (string) ANY, " */
/* "sprop-sei = (string) ANY, " */
/* "max-lsr = (int) ANY, " *//* MUST be in the range of MaxLumaSR to 16 * MaxLumaSR, inclusive */
/* "max-lps = (int) ANY, " *//* MUST be in the range of MaxLumaPS to 16 * MaxLumaPS, inclusive */
/* "max-cpb = (int) ANY, " *//* MUST be in the range of MaxCPB to 16 * MaxCPB, inclusive */
/* "max-dpb = (int) [1, 16], " */
/* "max-br = (int) ANY, " *//* MUST be in the range of MaxBR to 16 * MaxBR, inclusive, for the highest level */
/* "max-tr = (int) ANY, " *//* MUST be in the range of MaxTileRows to 16 * MaxTileRows, inclusive, for the highest level */
/* "max-tc = (int) ANY, " *//* MUST be in the range of MaxTileCols to 16 * MaxTileCols, inclusive, for the highest level */
/* "max-fps = (int) ANY, " */
/* "sprop-max-don-diff = (int) [0, 32767], " */
/* "sprop-depack-buf-nalus = (int) [0, 32767], " */
/* "sprop-depack-buf-nalus = (int) [0, 4294967295], " */
/* "depack-buf-cap = (int) [1, 4294967295], " */
/* "sprop-segmentation-id = (int) [0, 3], " */
/* "sprop-spatial-segmentation-idc = (string) ANY, " */
/* "dec-parallel-cap = (string) ANY, " */
);
#define gst_rtp_h265_depay_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstRtpH265Depay, gst_rtp_h265_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD, GST_DEBUG_CATEGORY_INIT (rtph265depay_debug,
"rtph265depay", 0, "H265 Video RTP Depayloader"));
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtph265depay, "rtph265depay",
GST_RANK_SECONDARY, GST_TYPE_RTP_H265_DEPAY, rtp_element_init (plugin));
static void gst_rtp_h265_depay_finalize (GObject * object);
static GstStateChangeReturn gst_rtp_h265_depay_change_state (GstElement *
element, GstStateChange transition);
static GstBuffer *gst_rtp_h265_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp);
static gboolean gst_rtp_h265_depay_setcaps (GstRTPBaseDepayload * filter,
GstCaps * caps);
static gboolean gst_rtp_h265_depay_handle_event (GstRTPBaseDepayload * depay,
GstEvent * event);
static GstBuffer *gst_rtp_h265_complete_au (GstRtpH265Depay * rtph265depay,
GstClockTime * out_timestamp, gboolean * out_keyframe);
static void gst_rtp_h265_depay_push (GstRtpH265Depay * rtph265depay,
GstBuffer * outbuf, gboolean keyframe, GstClockTime timestamp,
gboolean marker);
static void
gst_rtp_h265_depay_class_init (GstRtpH265DepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gobject_class->finalize = gst_rtp_h265_depay_finalize;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_h265_depay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_h265_depay_sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"RTP H265 depayloader", "Codec/Depayloader/Network/RTP",
"Extracts H265 video from RTP packets (RFC 7798)",
"Jurgen Slowack <jurgenslowack@gmail.com>");
gstelement_class->change_state = gst_rtp_h265_depay_change_state;
gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_h265_depay_process;
gstrtpbasedepayload_class->set_caps = gst_rtp_h265_depay_setcaps;
gstrtpbasedepayload_class->handle_event = gst_rtp_h265_depay_handle_event;
}
static void
gst_rtp_h265_depay_init (GstRtpH265Depay * rtph265depay)
{
rtph265depay->adapter = gst_adapter_new ();
rtph265depay->picture_adapter = gst_adapter_new ();
rtph265depay->output_format = DEFAULT_STREAM_FORMAT;
rtph265depay->byte_stream =
(DEFAULT_STREAM_FORMAT == GST_H265_STREAM_FORMAT_BYTESTREAM);
rtph265depay->stream_format = NULL;
rtph265depay->merge = DEFAULT_ACCESS_UNIT;
rtph265depay->vps = g_ptr_array_new_with_free_func (
(GDestroyNotify) gst_buffer_unref);
rtph265depay->sps = g_ptr_array_new_with_free_func (
(GDestroyNotify) gst_buffer_unref);
rtph265depay->pps = g_ptr_array_new_with_free_func (
(GDestroyNotify) gst_buffer_unref);
}
static void
gst_rtp_h265_depay_reset (GstRtpH265Depay * rtph265depay, gboolean hard)
{
gst_adapter_clear (rtph265depay->adapter);
rtph265depay->wait_start = TRUE;
gst_adapter_clear (rtph265depay->picture_adapter);
rtph265depay->picture_start = FALSE;
rtph265depay->last_keyframe = FALSE;
rtph265depay->last_ts = 0;
rtph265depay->current_fu_type = 0;
rtph265depay->new_codec_data = FALSE;
g_ptr_array_set_size (rtph265depay->vps, 0);
g_ptr_array_set_size (rtph265depay->sps, 0);
g_ptr_array_set_size (rtph265depay->pps, 0);
if (hard) {
if (rtph265depay->allocator != NULL) {
gst_object_unref (rtph265depay->allocator);
rtph265depay->allocator = NULL;
}
gst_allocation_params_init (&rtph265depay->params);
}
}
static void
gst_rtp_h265_depay_drain (GstRtpH265Depay * rtph265depay)
{
GstClockTime timestamp;
gboolean keyframe;
GstBuffer *outbuf;
if (!rtph265depay->picture_start)
return;
outbuf = gst_rtp_h265_complete_au (rtph265depay, &timestamp, &keyframe);
if (outbuf)
gst_rtp_h265_depay_push (rtph265depay, outbuf, keyframe, timestamp, FALSE);
}
static void
gst_rtp_h265_depay_finalize (GObject * object)
{
GstRtpH265Depay *rtph265depay;
rtph265depay = GST_RTP_H265_DEPAY (object);
if (rtph265depay->codec_data)
gst_buffer_unref (rtph265depay->codec_data);
g_object_unref (rtph265depay->adapter);
g_object_unref (rtph265depay->picture_adapter);
g_ptr_array_free (rtph265depay->vps, TRUE);
g_ptr_array_free (rtph265depay->sps, TRUE);
g_ptr_array_free (rtph265depay->pps, TRUE);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static inline const gchar *
stream_format_get_nick (GstH265StreamFormat fmt)
{
switch (fmt) {
case GST_H265_STREAM_FORMAT_BYTESTREAM:
return "byte-stream";
case GST_H265_STREAM_FORMAT_HVC1:
return "hvc1";
case GST_H265_STREAM_FORMAT_HEV1:
return "hev1";
default:
break;
}
return "unknown";
}
static void
gst_rtp_h265_depay_negotiate (GstRtpH265Depay * rtph265depay)
{
GstH265StreamFormat stream_format = GST_H265_STREAM_FORMAT_UNKNOWN;
GstCaps *caps;
gint merge = -1;
caps =
gst_pad_get_allowed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay));
GST_DEBUG_OBJECT (rtph265depay, "allowed caps: %" GST_PTR_FORMAT, caps);
if (caps) {
if (gst_caps_get_size (caps) > 0) {
GstStructure *s = gst_caps_get_structure (caps, 0);
const gchar *str = NULL;
if ((str = gst_structure_get_string (s, "stream-format"))) {
rtph265depay->stream_format = g_intern_string (str);
if (strcmp (str, "hev1") == 0) {
stream_format = GST_H265_STREAM_FORMAT_HEV1;
} else if (strcmp (str, "hvc1") == 0) {
stream_format = GST_H265_STREAM_FORMAT_HVC1;
} else if (strcmp (str, "byte-stream") == 0) {
stream_format = GST_H265_STREAM_FORMAT_BYTESTREAM;
} else {
GST_DEBUG_OBJECT (rtph265depay, "unknown stream-format: %s", str);
}
}
if ((str = gst_structure_get_string (s, "alignment"))) {
if (strcmp (str, "au") == 0) {
merge = TRUE;
} else if (strcmp (str, "nal") == 0) {
merge = FALSE;
} else {
GST_DEBUG_OBJECT (rtph265depay, "unknown alignment: %s", str);
}
}
}
gst_caps_unref (caps);
}
if (stream_format != GST_H265_STREAM_FORMAT_UNKNOWN) {
GST_DEBUG_OBJECT (rtph265depay, "downstream wants stream-format %s",
stream_format_get_nick (stream_format));
rtph265depay->output_format = stream_format;
} else {
GST_DEBUG_OBJECT (rtph265depay, "defaulting to output stream-format %s",
stream_format_get_nick (DEFAULT_STREAM_FORMAT));
rtph265depay->stream_format =
stream_format_get_nick (DEFAULT_STREAM_FORMAT);
rtph265depay->output_format = DEFAULT_STREAM_FORMAT;
}
rtph265depay->byte_stream =
(rtph265depay->output_format == GST_H265_STREAM_FORMAT_BYTESTREAM);
if (merge != -1) {
GST_DEBUG_OBJECT (rtph265depay, "downstream requires merge %d", merge);
rtph265depay->merge = merge;
} else {
GST_DEBUG_OBJECT (rtph265depay, "defaulting to merge %d",
DEFAULT_ACCESS_UNIT);
rtph265depay->merge = DEFAULT_ACCESS_UNIT;
}
}
static gboolean
parse_sps (GstMapInfo * map, guint32 * sps_id)
{ /* To parse seq_parameter_set_id */
GstBitReader br = GST_BIT_READER_INIT (map->data + 15,
map->size - 15);
GST_MEMDUMP ("SPS", map->data, map->size);
if (map->size < 16)
return FALSE;
if (!gst_rtp_read_golomb (&br, sps_id))
return FALSE;
return TRUE;
}
static gboolean
parse_pps (GstMapInfo * map, guint32 * sps_id, guint32 * pps_id)
{ /* To parse picture_parameter_set_id */
GstBitReader br = GST_BIT_READER_INIT (map->data + 2,
map->size - 2);
GST_MEMDUMP ("PPS", map->data, map->size);
if (map->size < 3)
return FALSE;
if (!gst_rtp_read_golomb (&br, pps_id))
return FALSE;
if (!gst_rtp_read_golomb (&br, sps_id))
return FALSE;
return TRUE;
}
static gboolean
gst_rtp_h265_depay_set_output_caps (GstRtpH265Depay * rtph265depay,
GstCaps * caps)
{
GstAllocationParams params;
GstAllocator *allocator = NULL;
GstPad *srcpad;
gboolean res;
gst_allocation_params_init (&params);
srcpad = GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay);
res = gst_pad_set_caps (srcpad, caps);
if (res) {
GstQuery *query;
query = gst_query_new_allocation (caps, TRUE);
if (!gst_pad_peer_query (srcpad, query)) {
GST_DEBUG_OBJECT (rtph265depay, "downstream ALLOCATION query failed");
}
if (gst_query_get_n_allocation_params (query) > 0) {
gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
}
gst_query_unref (query);
}
if (rtph265depay->allocator)
gst_object_unref (rtph265depay->allocator);
rtph265depay->allocator = allocator;
rtph265depay->params = params;
return res;
}
static gboolean
gst_rtp_h265_set_src_caps (GstRtpH265Depay * rtph265depay)
{
gboolean res;
GstCaps *old_caps;
GstCaps *srccaps;
GstPad *srcpad;
if (!rtph265depay->byte_stream &&
(!rtph265depay->new_codec_data ||
rtph265depay->vps->len == 0 || rtph265depay->sps->len == 0
|| rtph265depay->pps->len == 0))
return TRUE;
srccaps = gst_caps_new_simple ("video/x-h265",
"stream-format", G_TYPE_STRING, rtph265depay->stream_format,
"alignment", G_TYPE_STRING, rtph265depay->merge ? "au" : "nal", NULL);
if (!rtph265depay->byte_stream) {
GstBuffer *codec_data;
gint i = 0;
gint len;
guint num_vps = rtph265depay->vps->len;
guint num_sps = rtph265depay->sps->len;
guint num_pps = rtph265depay->pps->len;
GstMapInfo map, nalmap;
guint8 *data;
guint8 num_arrays = 0;
guint new_size;
GstBitReader br;
guint32 tmp;
guint8 tmp8 = 0;
guint32 max_sub_layers_minus1, temporal_id_nesting_flag, chroma_format_idc,
bit_depth_luma_minus8, bit_depth_chroma_minus8,
min_spatial_segmentation_idc;
/* Fixme: Current implementation is not embedding SEI in codec_data */
if (num_sps == 0)
return FALSE;
/* start with 23 bytes header */
len = 23;
num_arrays = (num_vps > 0) + (num_sps > 0) + (num_pps > 0);
len += 3 * num_arrays;
/* add size of vps, sps & pps */
for (i = 0; i < num_vps; i++)
len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph265depay->vps, i));
for (i = 0; i < num_sps; i++)
len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph265depay->sps, i));
for (i = 0; i < num_pps; i++)
len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph265depay->pps, i));
GST_DEBUG_OBJECT (rtph265depay,
"constructing codec_data: num_vps =%d num_sps=%d, num_pps=%d", num_vps,
num_sps, num_pps);
codec_data = gst_buffer_new_and_alloc (len);
gst_buffer_map (codec_data, &map, GST_MAP_READWRITE);
data = map.data;
memset (data, 0, map.size);
/* Parsing sps to get the info required further on */
gst_buffer_map (g_ptr_array_index (rtph265depay->sps, 0), &nalmap,
GST_MAP_READ);
max_sub_layers_minus1 = ((nalmap.data[2]) >> 1) & 0x07;
temporal_id_nesting_flag = nalmap.data[2] & 0x01;
gst_bit_reader_init (&br, nalmap.data + 15, nalmap.size - 15);
gst_rtp_read_golomb (&br, &tmp); /* sps_seq_parameter_set_id */
gst_rtp_read_golomb (&br, &chroma_format_idc); /* chroma_format_idc */
if (chroma_format_idc == 3)
gst_bit_reader_get_bits_uint8 (&br, &tmp8, 1); /* separate_colour_plane_flag */
gst_rtp_read_golomb (&br, &tmp); /* pic_width_in_luma_samples */
gst_rtp_read_golomb (&br, &tmp); /* pic_height_in_luma_samples */
gst_bit_reader_get_bits_uint8 (&br, &tmp8, 1); /* conformance_window_flag */
if (tmp8) {
gst_rtp_read_golomb (&br, &tmp); /* conf_win_left_offset */
gst_rtp_read_golomb (&br, &tmp); /* conf_win_right_offset */
gst_rtp_read_golomb (&br, &tmp); /* conf_win_top_offset */
gst_rtp_read_golomb (&br, &tmp); /* conf_win_bottom_offset */
}
gst_rtp_read_golomb (&br, &bit_depth_luma_minus8); /* bit_depth_luma_minus8 */
gst_rtp_read_golomb (&br, &bit_depth_chroma_minus8); /* bit_depth_chroma_minus8 */
GST_DEBUG_OBJECT (rtph265depay,
"Ignoring min_spatial_segmentation for now (assuming zero)");
min_spatial_segmentation_idc = 0; /* NOTE - we ignore this for now, but in a perfect world, we should continue parsing to obtain the real value */
gst_buffer_unmap (g_ptr_array_index (rtph265depay->sps, 0), &nalmap);
/* HEVCDecoderConfigurationVersion = 1 */
data[0] = 1;
/* Copy from profile_tier_level (Rec. ITU-T H.265 (04/2013) section 7.3.3
*
* profile_space | tier_flat | profile_idc |
* profile_compatibility_flags | constraint_indicator_flags |
* level_idc | progressive_source_flag | interlaced_source_flag
* non_packed_constraint_flag | frame_only_constraint_flag
* reserved_zero_44bits | level_idc */
gst_buffer_map (g_ptr_array_index (rtph265depay->sps, 0), &nalmap,
GST_MAP_READ);
for (i = 0; i < 12; i++)
data[i + 1] = nalmap.data[i];
gst_buffer_unmap (g_ptr_array_index (rtph265depay->sps, 0), &nalmap);
/* min_spatial_segmentation_idc */
GST_WRITE_UINT16_BE (data + 13, min_spatial_segmentation_idc);
data[13] |= 0xf0;
data[15] = 0xfc; /* keeping parrallelismType as zero (unknown) */
data[16] = 0xfc | chroma_format_idc;
data[17] = 0xf8 | bit_depth_luma_minus8;
data[18] = 0xf8 | bit_depth_chroma_minus8;
data[19] = 0x00; /* keep avgFrameRate as unspecified */
data[20] = 0x00; /* keep avgFrameRate as unspecified */
/* constFrameRate(2 bits): 0, stream may or may not be of constant framerate
* numTemporalLayers (3 bits): number of temporal layers, value from SPS
* TemporalIdNested (1 bit): sps_temporal_id_nesting_flag from SPS
* lengthSizeMinusOne (2 bits): plus 1 indicates the length of the NALUnitLength */
/* we always output NALs with 4-byte nal unit length markers (or sync code) */
data[21] = rtph265depay->byte_stream ? 0x00 : 0x03;
data[21] |= ((max_sub_layers_minus1 + 1) << 3);
data[21] |= (temporal_id_nesting_flag << 2);
GST_WRITE_UINT8 (data + 22, num_arrays); /* numOfArrays */
data += 23;
/* copy all VPS */
if (num_vps > 0) {
/* array_completeness | reserved_zero bit | nal_unit_type */
data[0] = 0x00 | 0x20;
data++;
GST_WRITE_UINT16_BE (data, num_vps);
data += 2;
for (i = 0; i < num_vps; i++) {
gsize nal_size =
gst_buffer_get_size (g_ptr_array_index (rtph265depay->vps, i));
GST_WRITE_UINT16_BE (data, nal_size);
gst_buffer_extract (g_ptr_array_index (rtph265depay->vps, i), 0,
data + 2, nal_size);
data += 2 + nal_size;
GST_DEBUG_OBJECT (rtph265depay, "Copied VPS %d of length %u", i,
(guint) nal_size);
}
}
/* copy all SPS */
if (num_sps > 0) {
/* array_completeness | reserved_zero bit | nal_unit_type */
data[0] = 0x00 | 0x21;
data++;
GST_WRITE_UINT16_BE (data, num_sps);
data += 2;
for (i = 0; i < num_sps; i++) {
gsize nal_size =
gst_buffer_get_size (g_ptr_array_index (rtph265depay->sps, i));
GST_WRITE_UINT16_BE (data, nal_size);
gst_buffer_extract (g_ptr_array_index (rtph265depay->sps, i), 0,
data + 2, nal_size);
data += 2 + nal_size;
GST_DEBUG_OBJECT (rtph265depay, "Copied SPS %d of length %u", i,
(guint) nal_size);
}
}
/* copy all PPS */
if (num_pps > 0) {
/* array_completeness | reserved_zero bit | nal_unit_type */
data[0] = 0x00 | 0x22;
data++;
GST_WRITE_UINT16_BE (data, num_pps);
data += 2;
for (i = 0; i < num_pps; i++) {
gsize nal_size =
gst_buffer_get_size (g_ptr_array_index (rtph265depay->pps, i));
GST_WRITE_UINT16_BE (data, nal_size);
gst_buffer_extract (g_ptr_array_index (rtph265depay->pps, i), 0,
data + 2, nal_size);
data += 2 + nal_size;
GST_DEBUG_OBJECT (rtph265depay, "Copied PPS %d of length %u", i,
(guint) nal_size);
}
}
new_size = data - map.data;
gst_buffer_unmap (codec_data, &map);
gst_buffer_set_size (codec_data, new_size);
gst_caps_set_simple (srccaps,
"codec_data", GST_TYPE_BUFFER, codec_data, NULL);
gst_buffer_unref (codec_data);
}
srcpad = GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay);
old_caps = gst_pad_get_current_caps (srcpad);
if (old_caps == NULL || !gst_caps_is_equal (srccaps, old_caps)) {
res = gst_rtp_h265_depay_set_output_caps (rtph265depay, srccaps);
} else {
res = TRUE;
}
gst_caps_unref (srccaps);
/* Insert SPS and PPS into the stream on next opportunity */
if (rtph265depay->output_format != GST_H265_STREAM_FORMAT_HVC1
&& (rtph265depay->sps->len > 0 || rtph265depay->pps->len > 0)) {
gint i;
GstBuffer *codec_data;
GstMapInfo map;
guint8 *data;
guint len = 0;
for (i = 0; i < rtph265depay->sps->len; i++) {
len += 4 + gst_buffer_get_size (g_ptr_array_index (rtph265depay->sps, i));
}
for (i = 0; i < rtph265depay->pps->len; i++) {
len += 4 + gst_buffer_get_size (g_ptr_array_index (rtph265depay->pps, i));
}
codec_data = gst_buffer_new_and_alloc (len);
gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
data = map.data;
for (i = 0; i < rtph265depay->sps->len; i++) {
GstBuffer *sps_buf = g_ptr_array_index (rtph265depay->sps, i);
guint sps_size = gst_buffer_get_size (sps_buf);
if (rtph265depay->byte_stream)
memcpy (data, sync_bytes, sizeof (sync_bytes));
else
GST_WRITE_UINT32_BE (data, sps_size);
gst_buffer_extract (sps_buf, 0, data + 4, -1);
data += 4 + sps_size;
}
for (i = 0; i < rtph265depay->pps->len; i++) {
GstBuffer *pps_buf = g_ptr_array_index (rtph265depay->pps, i);
guint pps_size = gst_buffer_get_size (pps_buf);
if (rtph265depay->byte_stream)
memcpy (data, sync_bytes, sizeof (sync_bytes));
else
GST_WRITE_UINT32_BE (data, pps_size);
gst_buffer_extract (pps_buf, 0, data + 4, -1);
data += 4 + pps_size;
}
gst_buffer_unmap (codec_data, &map);
if (rtph265depay->codec_data)
gst_buffer_unref (rtph265depay->codec_data);
rtph265depay->codec_data = codec_data;
}
if (res)
rtph265depay->new_codec_data = FALSE;
return res;
}
gboolean
gst_rtp_h265_add_vps_sps_pps (GstElement * rtph265, GPtrArray * vps_array,
GPtrArray * sps_array, GPtrArray * pps_array, GstBuffer * nal)
{
GstMapInfo map;
guchar type;
guint i;
gst_buffer_map (nal, &map, GST_MAP_READ);
type = (map.data[0] >> 1) & 0x3f;
if (type == GST_H265_VPS_NUT) {
guint32 vps_id = (map.data[2] >> 4) & 0x0f;
for (i = 0; i < vps_array->len; i++) {
GstBuffer *vps = g_ptr_array_index (vps_array, i);
GstMapInfo vpsmap;
guint32 tmp_vps_id;
gst_buffer_map (vps, &vpsmap, GST_MAP_READ);
tmp_vps_id = (vpsmap.data[2] >> 4) & 0x0f;
if (vps_id == tmp_vps_id) {
if (map.size == vpsmap.size &&
memcmp (map.data, vpsmap.data, vpsmap.size) == 0) {
GST_LOG_OBJECT (rtph265, "Unchanged VPS %u, not updating", vps_id);
gst_buffer_unmap (vps, &vpsmap);
goto drop;
} else {
gst_buffer_unmap (vps, &vpsmap);
g_ptr_array_remove_index_fast (vps_array, i);
g_ptr_array_add (vps_array, nal);
GST_LOG_OBJECT (rtph265, "Modified VPS %u, replacing", vps_id);
goto done;
}
}
gst_buffer_unmap (vps, &vpsmap);
}
GST_LOG_OBJECT (rtph265, "Adding new VPS %u", vps_id);
g_ptr_array_add (vps_array, nal);
} else if (type == GST_H265_SPS_NUT) {
guint32 sps_id;
if (!parse_sps (&map, &sps_id)) {
GST_WARNING_OBJECT (rtph265, "Invalid SPS,"
" can't parse seq_parameter_set_id");
goto drop;
}
for (i = 0; i < sps_array->len; i++) {
GstBuffer *sps = g_ptr_array_index (sps_array, i);
GstMapInfo spsmap;
guint32 tmp_sps_id;
gst_buffer_map (sps, &spsmap, GST_MAP_READ);
parse_sps (&spsmap, &tmp_sps_id);
if (sps_id == tmp_sps_id) {
if (map.size == spsmap.size &&
memcmp (map.data, spsmap.data, spsmap.size) == 0) {
GST_LOG_OBJECT (rtph265, "Unchanged SPS %u, not updating", sps_id);
gst_buffer_unmap (sps, &spsmap);
goto drop;
} else {
gst_buffer_unmap (sps, &spsmap);
g_ptr_array_remove_index_fast (sps_array, i);
g_ptr_array_add (sps_array, nal);
GST_LOG_OBJECT (rtph265, "Modified SPS %u, replacing", sps_id);
goto done;
}
}
gst_buffer_unmap (sps, &spsmap);
}
GST_LOG_OBJECT (rtph265, "Adding new SPS %u", sps_id);
g_ptr_array_add (sps_array, nal);
} else if (type == GST_H265_PPS_NUT) {
guint32 sps_id;
guint32 pps_id;
if (!parse_pps (&map, &sps_id, &pps_id)) {
GST_WARNING_OBJECT (rtph265, "Invalid PPS,"
" can't parse seq_parameter_set_id or pic_parameter_set_id");
goto drop;
}
for (i = 0; i < pps_array->len; i++) {
GstBuffer *pps = g_ptr_array_index (pps_array, i);
GstMapInfo ppsmap;
guint32 tmp_sps_id;
guint32 tmp_pps_id;
gst_buffer_map (pps, &ppsmap, GST_MAP_READ);
parse_pps (&ppsmap, &tmp_sps_id, &tmp_pps_id);
if (pps_id == tmp_pps_id) {
if (map.size == ppsmap.size &&
memcmp (map.data, ppsmap.data, ppsmap.size) == 0) {
GST_LOG_OBJECT (rtph265, "Unchanged PPS %u:%u, not updating", sps_id,
pps_id);
gst_buffer_unmap (pps, &ppsmap);
goto drop;
} else {
gst_buffer_unmap (pps, &ppsmap);
g_ptr_array_remove_index_fast (pps_array, i);
g_ptr_array_add (pps_array, nal);
GST_LOG_OBJECT (rtph265, "Modified PPS %u:%u, replacing",
sps_id, pps_id);
goto done;
}
}
gst_buffer_unmap (pps, &ppsmap);
}
GST_LOG_OBJECT (rtph265, "Adding new PPS %u:%i", sps_id, pps_id);
g_ptr_array_add (pps_array, nal);
} else {
goto drop;
}
done:
gst_buffer_unmap (nal, &map);
return TRUE;
drop:
gst_buffer_unmap (nal, &map);
gst_buffer_unref (nal);
return FALSE;
}
static void
gst_rtp_h265_depay_add_vps_sps_pps (GstRtpH265Depay * rtph265depay,
GstBuffer * nal)
{
if (gst_rtp_h265_add_vps_sps_pps (GST_ELEMENT (rtph265depay),
rtph265depay->vps, rtph265depay->sps, rtph265depay->pps, nal))
rtph265depay->new_codec_data = TRUE;
}
static gboolean
gst_rtp_h265_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
{
gint clock_rate;
GstStructure *structure = gst_caps_get_structure (caps, 0);
GstRtpH265Depay *rtph265depay;
const gchar *vps;
const gchar *sps;
const gchar *pps;
gchar *ps;
GstMapInfo map;
guint8 *ptr;
rtph265depay = GST_RTP_H265_DEPAY (depayload);
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
clock_rate = 90000;
depayload->clock_rate = clock_rate;
/* Base64 encoded, comma separated config NALs */
vps = gst_structure_get_string (structure, "sprop-vps");
sps = gst_structure_get_string (structure, "sprop-sps");
pps = gst_structure_get_string (structure, "sprop-pps");
if (vps == NULL || sps == NULL || pps == NULL) {
ps = NULL;
} else {
ps = g_strdup_printf ("%s,%s,%s", vps, sps, pps);
}
/* negotiate with downstream w.r.t. output format and alignment */
gst_rtp_h265_depay_negotiate (rtph265depay);
if (rtph265depay->byte_stream && ps != NULL) {
/* for bytestream we only need the parameter sets but we don't error out
* when they are not there, we assume they are in the stream. */
gchar **params;
GstBuffer *codec_data;
guint len, total;
gint i;
params = g_strsplit (ps, ",", 0);
/* count total number of bytes in base64. Also include the sync bytes in
* front of the params. */
len = 0;
for (i = 0; params[i]; i++) {
len += strlen (params[i]);
len += sizeof (sync_bytes);
}
/* we seriously overshoot the length, but it's fine. */
codec_data = gst_buffer_new_and_alloc (len);
gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
ptr = map.data;
total = 0;
for (i = 0; params[i]; i++) {
guint save = 0;
gint state = 0;
GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
memcpy (ptr, sync_bytes, sizeof (sync_bytes));
ptr += sizeof (sync_bytes);
len =
g_base64_decode_step (params[i], strlen (params[i]), ptr, &state,
&save);
GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
total += len + sizeof (sync_bytes);
ptr += len;
}
gst_buffer_unmap (codec_data, &map);
gst_buffer_resize (codec_data, 0, total);
g_strfreev (params);
/* keep the codec_data, we need to send it as the first buffer. We cannot
* push it in the adapter because the adapter might be flushed on discont.
*/
if (rtph265depay->codec_data)
gst_buffer_unref (rtph265depay->codec_data);
rtph265depay->codec_data = codec_data;
} else if (!rtph265depay->byte_stream) {
gchar **params;
gint i;
if (ps == NULL)
goto incomplete_caps;
params = g_strsplit (ps, ",", 0);
GST_DEBUG_OBJECT (depayload, "we have %d params", g_strv_length (params));
/* start with 23 bytes header */
for (i = 0; params[i]; i++) {
GstBuffer *nal;
GstMapInfo nalmap;
gsize nal_len;
guint save = 0;
gint state = 0;
nal_len = strlen (params[i]);
if (nal_len == 0) {
GST_WARNING_OBJECT (depayload, "empty param '%s' (#%d)", params[i], i);
continue;
}
nal = gst_buffer_new_and_alloc (nal_len);
gst_buffer_map (nal, &nalmap, GST_MAP_READWRITE);
nal_len =
g_base64_decode_step (params[i], nal_len, nalmap.data, &state, &save);
GST_DEBUG_OBJECT (depayload, "adding param %d as %s", i,
(((nalmap.data[0] >> 1) & 0x3f) ==
32) ? "VPS" : (((nalmap.data[0] >> 1) & 0x3f) ==
33) ? "SPS" : "PPS");
gst_buffer_unmap (nal, &nalmap);
gst_buffer_set_size (nal, nal_len);
gst_rtp_h265_depay_add_vps_sps_pps (rtph265depay, nal);
}
g_strfreev (params);
if (rtph265depay->vps->len == 0 || rtph265depay->sps->len == 0 ||
rtph265depay->pps->len == 0) {
goto incomplete_caps;
}
}
g_free (ps);
return gst_rtp_h265_set_src_caps (rtph265depay);
/* ERRORS */
incomplete_caps:
{
GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
" doing setcaps later");
g_free (ps);
return TRUE;
}
}
static GstBuffer *
gst_rtp_h265_depay_allocate_output_buffer (GstRtpH265Depay * depay, gsize size)
{
GstBuffer *buffer = NULL;
g_return_val_if_fail (size > 0, NULL);
GST_LOG_OBJECT (depay, "want output buffer of %u bytes", (guint) size);
buffer = gst_buffer_new_allocate (depay->allocator, size, &depay->params);
if (buffer == NULL) {
GST_INFO_OBJECT (depay, "couldn't allocate output buffer");
buffer = gst_buffer_new_allocate (NULL, size, NULL);
}
return buffer;
}
static GstBuffer *
gst_rtp_h265_complete_au (GstRtpH265Depay * rtph265depay,
GstClockTime * out_timestamp, gboolean * out_keyframe)
{
GstBufferList *list;
GstMapInfo outmap;
GstBuffer *outbuf;
guint outsize, offset = 0;
gint b, n_bufs, m, n_mem;
/* we had a picture in the adapter and we completed it */
GST_DEBUG_OBJECT (rtph265depay, "taking completed AU");
outsize = gst_adapter_available (rtph265depay->picture_adapter);
outbuf = gst_rtp_h265_depay_allocate_output_buffer (rtph265depay, outsize);
if (outbuf == NULL)
return NULL;
if (!gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE))
return NULL;
list = gst_adapter_take_buffer_list (rtph265depay->picture_adapter, outsize);
n_bufs = gst_buffer_list_length (list);
for (b = 0; b < n_bufs; ++b) {
GstBuffer *buf = gst_buffer_list_get (list, b);
n_mem = gst_buffer_n_memory (buf);
for (m = 0; m < n_mem; ++m) {
GstMemory *mem = gst_buffer_peek_memory (buf, m);
gsize mem_size = gst_memory_get_sizes (mem, NULL, NULL);
GstMapInfo mem_map;
if (gst_memory_map (mem, &mem_map, GST_MAP_READ)) {
memcpy (outmap.data + offset, mem_map.data, mem_size);
gst_memory_unmap (mem, &mem_map);
} else {
memset (outmap.data + offset, 0, mem_size);
}
offset += mem_size;
}
gst_rtp_copy_video_meta (rtph265depay, outbuf, buf);
}
gst_buffer_list_unref (list);
gst_buffer_unmap (outbuf, &outmap);
*out_timestamp = rtph265depay->last_ts;
*out_keyframe = rtph265depay->last_keyframe;
rtph265depay->last_keyframe = FALSE;
rtph265depay->picture_start = FALSE;
return outbuf;
}
/* VPS/SPS/PPS/RADL/TSA/RASL/IDR/CRA is considered key, all others DELTA;
* so downstream waiting for keyframe can pick up at VPS/SPS/PPS/IDR */
#define NAL_TYPE_IS_PARAMETER_SET(nt) ( ((nt) == GST_H265_VPS_NUT)\
|| ((nt) == GST_H265_SPS_NUT)\
|| ((nt) == GST_H265_PPS_NUT) )
#define NAL_TYPE_IS_CODED_SLICE_SEGMENT(nt) ( ((nt) == GST_H265_NAL_SLICE_TRAIL_N)\
|| ((nt) == GST_H265_NAL_SLICE_TRAIL_R)\
|| ((nt) == GST_H265_NAL_SLICE_TSA_N)\
|| ((nt) == GST_H265_NAL_SLICE_TSA_R)\
|| ((nt) == GST_H265_NAL_SLICE_STSA_N)\
|| ((nt) == GST_H265_NAL_SLICE_STSA_R)\
|| ((nt) == GST_H265_NAL_SLICE_RASL_N)\
|| ((nt) == GST_H265_NAL_SLICE_RASL_R)\
|| ((nt) == GST_H265_NAL_SLICE_BLA_W_LP)\
|| ((nt) == GST_H265_NAL_SLICE_BLA_W_RADL)\
|| ((nt) == GST_H265_NAL_SLICE_BLA_N_LP)\
|| ((nt) == GST_H265_NAL_SLICE_IDR_W_RADL)\
|| ((nt) == GST_H265_NAL_SLICE_IDR_N_LP)\
|| ((nt) == GST_H265_NAL_SLICE_CRA_NUT) )
/* Intra random access point */
#define NAL_TYPE_IS_IRAP(nt) (((nt) == GST_H265_NAL_SLICE_BLA_W_LP) \
|| ((nt) == GST_H265_NAL_SLICE_BLA_W_RADL) \
|| ((nt) == GST_H265_NAL_SLICE_BLA_N_LP) \
|| ((nt) == GST_H265_NAL_SLICE_IDR_W_RADL) \
|| ((nt) == GST_H265_NAL_SLICE_IDR_N_LP) \
|| ((nt) == GST_H265_NAL_SLICE_CRA_NUT))
#define NAL_TYPE_IS_KEY(nt) (NAL_TYPE_IS_PARAMETER_SET(nt) || NAL_TYPE_IS_IRAP(nt))
static void
gst_rtp_h265_depay_push (GstRtpH265Depay * rtph265depay, GstBuffer * outbuf,
gboolean keyframe, GstClockTime timestamp, gboolean marker)
{
/* prepend codec_data */
if (rtph265depay->codec_data) {
GST_DEBUG_OBJECT (rtph265depay, "prepending codec_data");
gst_rtp_copy_video_meta (rtph265depay, rtph265depay->codec_data, outbuf);
outbuf = gst_buffer_append (rtph265depay->codec_data, outbuf);
rtph265depay->codec_data = NULL;
keyframe = TRUE;
}
outbuf = gst_buffer_make_writable (outbuf);
gst_rtp_drop_non_video_meta (rtph265depay, outbuf);
GST_BUFFER_PTS (outbuf) = timestamp;
if (keyframe)
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
if (marker)
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_MARKER);
gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph265depay), outbuf);
}
static void
gst_rtp_h265_depay_handle_nal (GstRtpH265Depay * rtph265depay, GstBuffer * nal,
GstClockTime in_timestamp, gboolean marker)
{
GstRTPBaseDepayload *depayload = GST_RTP_BASE_DEPAYLOAD (rtph265depay);
gint nal_type;
GstMapInfo map;
GstBuffer *outbuf = NULL;
GstClockTime out_timestamp;
gboolean keyframe, out_keyframe;
gst_buffer_map (nal, &map, GST_MAP_READ);
if (G_UNLIKELY (map.size < 5))
goto short_nal;
nal_type = (map.data[4] >> 1) & 0x3f;
GST_DEBUG_OBJECT (rtph265depay, "handle NAL type %d (RTP marker bit %d)",
nal_type, marker);
keyframe = NAL_TYPE_IS_KEY (nal_type);
out_keyframe = keyframe;
out_timestamp = in_timestamp;
if (!rtph265depay->byte_stream) {
if (NAL_TYPE_IS_PARAMETER_SET (nal_type)) {
gst_rtp_h265_depay_add_vps_sps_pps (rtph265depay,
gst_buffer_copy_region (nal, GST_BUFFER_COPY_ALL,
4, gst_buffer_get_size (nal) - 4));
gst_buffer_unmap (nal, &map);
gst_buffer_unref (nal);
return;
} else if (rtph265depay->sps->len == 0 || rtph265depay->pps->len == 0) {
/* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
* go through yet
*/
gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
gst_structure_new ("GstForceKeyUnit",
"all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
gst_buffer_unmap (nal, &map);
gst_buffer_unref (nal);
return;
}
if (rtph265depay->new_codec_data &&
rtph265depay->sps->len > 0 && rtph265depay->pps->len > 0)
gst_rtp_h265_set_src_caps (rtph265depay);
}
if (rtph265depay->merge) {
gboolean start = FALSE, complete = FALSE;
/* marker bit isn't mandatory so in the following code we try to detect
* an AU boundary (see H.265 spec section 7.4.2.4.4) */
if (!marker) {
if (NAL_TYPE_IS_CODED_SLICE_SEGMENT (nal_type)) {
/* A NAL unit (X) ends an access unit if the next-occurring VCL NAL unit (Y) has the high-order bit of the first byte after its NAL unit header equal to 1 */
start = TRUE;
if (((map.data[6] >> 7) & 0x01) == 1) {
complete = TRUE;
}
} else if ((nal_type >= 32 && nal_type <= 35)
|| nal_type == 39 || (nal_type >= 41 && nal_type <= 44)
|| (nal_type >= 48 && nal_type <= 55)) {
/* VPS, SPS, PPS, SEI, ... terminate an access unit */
complete = TRUE;
}
GST_DEBUG_OBJECT (depayload, "start %d, complete %d", start, complete);
if (complete && rtph265depay->picture_start)
outbuf = gst_rtp_h265_complete_au (rtph265depay, &out_timestamp,
&out_keyframe);
}
/* add to adapter */
gst_buffer_unmap (nal, &map);
GST_DEBUG_OBJECT (depayload, "adding NAL to picture adapter");
gst_adapter_push (rtph265depay->picture_adapter, nal);
rtph265depay->last_ts = in_timestamp;
rtph265depay->last_keyframe |= keyframe;
rtph265depay->picture_start |= start;
if (marker)
outbuf = gst_rtp_h265_complete_au (rtph265depay, &out_timestamp,
&out_keyframe);
} else {
/* no merge, output is input nal */
GST_DEBUG_OBJECT (depayload, "using NAL as output");
outbuf = nal;
gst_buffer_unmap (nal, &map);
}
if (outbuf) {
gst_rtp_h265_depay_push (rtph265depay, outbuf, out_keyframe, out_timestamp,
marker);
}
return;
/* ERRORS */
short_nal:
{
GST_WARNING_OBJECT (depayload, "dropping short NAL");
gst_buffer_unmap (nal, &map);
gst_buffer_unref (nal);
return;
}
}
static void
gst_rtp_h265_finish_fragmentation_unit (GstRtpH265Depay * rtph265depay)
{
guint outsize;
GstMapInfo map;
GstBuffer *outbuf;
outsize = gst_adapter_available (rtph265depay->adapter);
g_assert (outsize >= 4);
outbuf = gst_adapter_take_buffer (rtph265depay->adapter, outsize);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
GST_DEBUG_OBJECT (rtph265depay, "output %d bytes", outsize);
if (rtph265depay->byte_stream) {
memcpy (map.data, sync_bytes, sizeof (sync_bytes));
} else {
GST_WRITE_UINT32_BE (map.data, outsize - 4);
}
gst_buffer_unmap (outbuf, &map);
rtph265depay->current_fu_type = 0;
gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf,
rtph265depay->fu_timestamp, rtph265depay->fu_marker);
}
static GstBuffer *
gst_rtp_h265_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
{
GstRtpH265Depay *rtph265depay;
GstBuffer *outbuf = NULL;
guint8 nal_unit_type;
rtph265depay = GST_RTP_H265_DEPAY (depayload);
/* flush remaining data on discont */
if (GST_BUFFER_IS_DISCONT (rtp->buffer)) {
gst_adapter_clear (rtph265depay->adapter);
rtph265depay->wait_start = TRUE;
rtph265depay->current_fu_type = 0;
rtph265depay->last_fu_seqnum = 0;
}
{
gint payload_len;
guint8 *payload;
guint header_len;
GstMapInfo map;
guint outsize, nalu_size;
GstClockTime timestamp;
gboolean marker;
guint8 nuh_layer_id, nuh_temporal_id_plus1;
guint8 S, E;
guint16 nal_header;
#if 0
gboolean donl_present = FALSE;
#endif
timestamp = GST_BUFFER_PTS (rtp->buffer);
payload_len = gst_rtp_buffer_get_payload_len (rtp);
payload = gst_rtp_buffer_get_payload (rtp);
marker = gst_rtp_buffer_get_marker (rtp);
GST_DEBUG_OBJECT (rtph265depay, "receiving %d bytes", payload_len);
if (payload_len == 0)
goto empty_packet;
/* +---------------+---------------+
* |0|1|2|3|4|5|6|7|0|1|2|3|4|5|6|7|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |F| Type | LayerId | TID |
* +-------------+-----------------+
*
* F must be 0.
*
*/
nal_unit_type = (payload[0] >> 1) & 0x3f;
nuh_layer_id = ((payload[0] & 0x01) << 5) | (payload[1] >> 3); /* should be zero for now but this could change in future HEVC extensions */
nuh_temporal_id_plus1 = payload[1] & 0x03;
/* At least two byte header with type */
header_len = 2;
GST_DEBUG_OBJECT (rtph265depay,
"NAL header nal_unit_type %d, nuh_temporal_id_plus1 %d", nal_unit_type,
nuh_temporal_id_plus1);
GST_FIXME_OBJECT (rtph265depay, "Assuming DONL field is not present");
/* FIXME - assuming DONL field is not present for now */
/*donl_present = (tx-mode == "MST") || (sprop-max-don-diff > 0); */
/* If FU unit was being processed, but the current nal is of a different
* type. Assume that the remote payloader is buggy (didn't set the end bit
* when the FU ended) and send out what we gathered thusfar */
if (G_UNLIKELY (rtph265depay->current_fu_type != 0 &&
nal_unit_type != rtph265depay->current_fu_type))
gst_rtp_h265_finish_fragmentation_unit (rtph265depay);
switch (nal_unit_type) {
case 48:
{
GST_DEBUG_OBJECT (rtph265depay, "Processing aggregation packet");
/* Aggregation packet (section 4.7) */
/* An example of an AP packet containing two aggregation units
without the DONL and DOND fields
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RTP Header |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PayloadHdr (Type=48) | NALU 1 Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| NALU 1 HDR | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ NALU 1 Data |
| . . . |
| |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| . . . | NALU 2 Size | NALU 2 HDR |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| NALU 2 HDR | |
+-+-+-+-+-+-+-+-+ NALU 2 Data |
| . . . |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| :...OPTIONAL RTP padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/* strip headers */
payload += header_len;
payload_len -= header_len;
rtph265depay->wait_start = FALSE;
#if 0
if (donl_present)
goto not_implemented_donl_present;
#endif
while (payload_len > 2) {
gboolean last = FALSE;
nalu_size = (payload[0] << 8) | payload[1];
/* don't include nalu_size */
if (nalu_size > (payload_len - 2))
nalu_size = payload_len - 2;
outsize = nalu_size + sizeof (sync_bytes);
outbuf = gst_buffer_new_and_alloc (outsize);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
if (rtph265depay->byte_stream) {
memcpy (map.data, sync_bytes, sizeof (sync_bytes));
} else {
GST_WRITE_UINT32_BE (map.data, nalu_size);
}
/* strip NALU size */
payload += 2;
payload_len -= 2;
memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
gst_buffer_unmap (outbuf, &map);
gst_rtp_copy_video_meta (rtph265depay, outbuf, rtp->buffer);
if (payload_len - nalu_size <= 2)
last = TRUE;
gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf, timestamp,
marker && last);
payload += nalu_size;
payload_len -= nalu_size;
}
break;
}
case 49:
{
GST_DEBUG_OBJECT (rtph265depay, "Processing Fragmentation Unit");
/* Fragmentation units (FUs) Section 4.8 */
/* The structure of a Fragmentation Unit (FU)
*
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PayloadHdr (Type=49) | FU header | DONL (cond) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
| DONL (cond) | |
|-+-+-+-+-+-+-+-+ |
| FU payload |
| |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| :...OPTIONAL RTP padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*
*/
/* strip headers */
payload += header_len;
payload_len -= header_len;
/* processing FU header */
S = (payload[0] & 0x80) == 0x80;
E = (payload[0] & 0x40) == 0x40;
GST_DEBUG_OBJECT (rtph265depay,
"FU header with S %d, E %d, nal_unit_type %d", S, E,
payload[0] & 0x3f);
if (rtph265depay->wait_start && !S)
goto waiting_start;
#if 0
if (donl_present)
goto not_implemented_donl_present;
#endif
if (S) {
GST_DEBUG_OBJECT (rtph265depay, "Start of Fragmentation Unit");
/* If a new FU unit started, while still processing an older one.
* Assume that the remote payloader is buggy (doesn't set the end
* bit) and send out what we've gathered thusfar */
if (G_UNLIKELY (rtph265depay->current_fu_type != 0))
gst_rtp_h265_finish_fragmentation_unit (rtph265depay);
rtph265depay->current_fu_type = nal_unit_type;
rtph265depay->fu_timestamp = timestamp;
rtph265depay->last_fu_seqnum = gst_rtp_buffer_get_seq (rtp);
rtph265depay->wait_start = FALSE;
/* reconstruct NAL header */
nal_header =
((payload[0] & 0x3f) << 9) | (nuh_layer_id << 3) |
nuh_temporal_id_plus1;
/* go back one byte so we can copy the payload + two bytes more in the front which
* will be overwritten by the nal_header
*/
payload -= 1;
payload_len += 1;
nalu_size = payload_len;
outsize = nalu_size + sizeof (sync_bytes);
outbuf = gst_buffer_new_and_alloc (outsize);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
if (rtph265depay->byte_stream) {
GST_WRITE_UINT32_BE (map.data, 0x00000001);
} else {
/* will be fixed up in finish_fragmentation_unit() */
GST_WRITE_UINT32_BE (map.data, 0xffffffff);
}
memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
map.data[4] = nal_header >> 8;
map.data[5] = nal_header & 0xff;
gst_buffer_unmap (outbuf, &map);
gst_rtp_copy_video_meta (rtph265depay, outbuf, rtp->buffer);
GST_DEBUG_OBJECT (rtph265depay, "queueing %d bytes", outsize);
/* and assemble in the adapter */
gst_adapter_push (rtph265depay->adapter, outbuf);
} else {
if (rtph265depay->current_fu_type == 0) {
/* previous FU packet missing start bit? */
GST_WARNING_OBJECT (rtph265depay, "missing FU start bit on an "
"earlier packet. Dropping.");
gst_adapter_clear (rtph265depay->adapter);
return NULL;
}
if (gst_rtp_buffer_compare_seqnum (rtph265depay->last_fu_seqnum,
gst_rtp_buffer_get_seq (rtp)) != 1) {
/* jump in sequence numbers within an FU is cause for discarding */
GST_WARNING_OBJECT (rtph265depay, "Jump in sequence numbers from "
"%u to %u within Fragmentation Unit. Data was lost, dropping "
"stored.", rtph265depay->last_fu_seqnum,
gst_rtp_buffer_get_seq (rtp));
gst_adapter_clear (rtph265depay->adapter);
return NULL;
}
rtph265depay->last_fu_seqnum = gst_rtp_buffer_get_seq (rtp);
GST_DEBUG_OBJECT (rtph265depay,
"Following part of Fragmentation Unit");
/* strip off FU header byte */
payload += 1;
payload_len -= 1;
outsize = payload_len;
outbuf = gst_buffer_new_and_alloc (outsize);
gst_buffer_fill (outbuf, 0, payload, outsize);
gst_rtp_copy_video_meta (rtph265depay, outbuf, rtp->buffer);
GST_DEBUG_OBJECT (rtph265depay, "queueing %d bytes", outsize);
/* and assemble in the adapter */
gst_adapter_push (rtph265depay->adapter, outbuf);
}
outbuf = NULL;
rtph265depay->fu_marker = marker;
/* if NAL unit ends, flush the adapter */
if (E) {
gst_rtp_h265_finish_fragmentation_unit (rtph265depay);
GST_DEBUG_OBJECT (rtph265depay, "End of Fragmentation Unit");
}
break;
}
case 50:
goto not_implemented; /* PACI packets Section 4.9 */
default:
{
rtph265depay->wait_start = FALSE;
/* All other cases: Single NAL unit packet Section 4.6 */
/* the entire payload is the output buffer */
#if 0
if (donl_present)
goto not_implemented_donl_present;
#endif
nalu_size = payload_len;
outsize = nalu_size + sizeof (sync_bytes);
outbuf = gst_buffer_new_and_alloc (outsize);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
if (rtph265depay->byte_stream) {
memcpy (map.data, sync_bytes, sizeof (sync_bytes));
} else {
GST_WRITE_UINT32_BE (map.data, nalu_size);
}
memcpy (map.data + 4, payload, nalu_size);
gst_buffer_unmap (outbuf, &map);
gst_rtp_copy_video_meta (rtph265depay, outbuf, rtp->buffer);
gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf, timestamp, marker);
break;
}
}
}
return NULL;
/* ERRORS */
empty_packet:
{
GST_DEBUG_OBJECT (rtph265depay, "empty packet");
return NULL;
}
waiting_start:
{
GST_DEBUG_OBJECT (rtph265depay, "waiting for start");
return NULL;
}
#if 0
not_implemented_donl_present:
{
GST_ELEMENT_ERROR (rtph265depay, STREAM, FORMAT,
(NULL), ("DONL field present not supported yet"));
return NULL;
}
#endif
not_implemented:
{
GST_ELEMENT_ERROR (rtph265depay, STREAM, FORMAT,
(NULL), ("NAL unit type %d not supported yet", nal_unit_type));
return NULL;
}
}
static gboolean
gst_rtp_h265_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
{
GstRtpH265Depay *rtph265depay;
rtph265depay = GST_RTP_H265_DEPAY (depay);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_rtp_h265_depay_reset (rtph265depay, FALSE);
break;
case GST_EVENT_EOS:
gst_rtp_h265_depay_drain (rtph265depay);
break;
default:
break;
}
return
GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (depay, event);
}
static GstStateChangeReturn
gst_rtp_h265_depay_change_state (GstElement * element,
GstStateChange transition)
{
GstRtpH265Depay *rtph265depay;
GstStateChangeReturn ret;
rtph265depay = GST_RTP_H265_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rtp_h265_depay_reset (rtph265depay, TRUE);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_rtp_h265_depay_reset (rtph265depay, TRUE);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
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