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gstreamer/gst/rtp/gstrtph265depay.c

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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 "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_BYTE_STREAM TRUE
#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 (
/* FIXME - hvc1 and hev1 formats are not supported yet */
/*"video/x-h265, "
"stream-format = (string) hvc1, alignment = (string) au; "
"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 (GstRtpH265Depay, gst_rtp_h265_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
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 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_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_h265_depay_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&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 (draft-ietf-payload-rtp-h265-03.txt)",
"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->byte_stream = DEFAULT_BYTE_STREAM;
rtph265depay->stream_format = (gchar *) g_malloc (10);
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)
{
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);
}
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_free (rtph265depay->stream_format);
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 void
gst_rtp_h265_depay_negotiate (GstRtpH265Depay * rtph265depay)
{
GstCaps *caps;
gint byte_stream = -1;
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"))) {
strcpy (rtph265depay->stream_format, str);
if (strcmp (str, "hev1") == 0) {
byte_stream = FALSE;
} else if (strcmp (str, "hvc1") == 0) {
byte_stream = FALSE;
} else if (strcmp (str, "byte-stream") == 0) {
byte_stream = TRUE;
} 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 (byte_stream != -1) {
GST_DEBUG_OBJECT (rtph265depay, "downstream requires byte-stream %d",
byte_stream);
rtph265depay->byte_stream = byte_stream;
} else {
GST_DEBUG_OBJECT (rtph265depay, "defaulting to byte-stream %d",
DEFAULT_BYTE_STREAM);
strcpy (rtph265depay->stream_format, "byte-stream");
rtph265depay->byte_stream = DEFAULT_BYTE_STREAM;
}
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;
}
}
/* Stolen from bad/gst/mpegtsdemux/payloader_parsers.c */
/* variable length Exp-Golomb parsing according to H.265 spec section 9.2*/
static gboolean
read_golomb (GstBitReader * br, guint32 * value)
{
guint8 b, leading_zeros = -1;
*value = 1;
for (b = 0; !b; leading_zeros++) {
if (!gst_bit_reader_get_bits_uint8 (br, &b, 1))
return FALSE;
*value *= 2;
}
*value = (*value >> 1) - 1;
if (leading_zeros > 0) {
guint32 tmp = 0;
if (!gst_bit_reader_get_bits_uint32 (br, &tmp, leading_zeros))
return FALSE;
*value += tmp;
}
return TRUE;
}
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);
if (map->size < 16)
return FALSE;
if (!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);
if (map->size < 3)
return FALSE;
if (!read_golomb (&br, pps_id))
return FALSE;
if (!read_golomb (&br, sps_id))
return FALSE;
return TRUE;
}
static gboolean
gst_rtp_h265_set_src_caps (GstRtpH265Depay * rtph265depay)
{
gboolean res;
GstCaps *srccaps;
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;
gint nl;
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 += 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);
g_debug ("alloc_len: %u", 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);
read_golomb (&br, &tmp); /* sps_seq_parameter_set_id */
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 */
read_golomb (&br, &tmp); /* pic_width_in_luma_samples */
read_golomb (&br, &tmp); /* pic_height_in_luma_samples */
gst_bit_reader_get_bits_uint8 (&br, &tmp8, 1); /* conformance_window_flag */
if (tmp8) {
read_golomb (&br, &tmp); /* conf_win_left_offset */
read_golomb (&br, &tmp); /* conf_win_right_offset */
read_golomb (&br, &tmp); /* conf_win_top_offset */
read_golomb (&br, &tmp); /* conf_win_bottom_offset */
}
read_golomb (&br, &bit_depth_luma_minus8); /* bit_depth_luma_minus8 */
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 */
nl = nalmap.size;
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 */
data[21] =
0x00 | ((max_sub_layers_minus1 +
1) << 3) | (temporal_id_nesting_flag << 2) | (nl - 1);
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);
}
if (gst_pad_has_current_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay))) {
GstCaps *old_caps =
gst_pad_get_current_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay));
/* Only update the caps if they are not equal. For
* AVC we don't update caps if only the codec_data
* changes. This is the same behaviour as in h264parse
* and gstrtph264depay
*/
if (rtph265depay->byte_stream) {
if (!gst_caps_is_equal (srccaps, old_caps))
res =
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay),
srccaps);
else
res = TRUE;
} else {
GstCaps *tmp_caps = gst_caps_copy (srccaps);
GstStructure *old_s, *tmp_s;
old_s = gst_caps_get_structure (old_caps, 0);
tmp_s = gst_caps_get_structure (tmp_caps, 0);
if (gst_structure_has_field (old_s, "codec_data"))
gst_structure_set_value (tmp_s, "codec_data",
gst_structure_get_value (old_s, "codec_data"));
if (!gst_caps_is_equal (old_caps, tmp_caps))
res =
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay),
srccaps);
else
res = TRUE;
gst_caps_unref (tmp_caps);
}
} else {
res =
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay),
srccaps);
}
gst_caps_unref (srccaps);
/* Insert SPS and PPS into the stream on next opportunity */
if (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 *ps;
GstBuffer *codec_data;
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 */
ps = gst_structure_get_string (structure, "sprop-parameter-sets");
/* 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;
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]);
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->sps->len == 0 || rtph265depay->pps->len == 0)
goto incomplete_caps;
}
return gst_rtp_h265_set_src_caps (rtph265depay);
/* ERRORS */
incomplete_caps:
{
GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
" doing setcaps later");
return TRUE;
}
}
static GstBuffer *
gst_rtp_h265_complete_au (GstRtpH265Depay * rtph265depay,
GstClockTime * out_timestamp, gboolean * out_keyframe)
{
guint outsize;
GstBuffer *outbuf;
/* 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_adapter_take_buffer (rtph265depay->picture_adapter, outsize);
*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) )
#define NAL_TYPE_IS_KEY(nt) (NAL_TYPE_IS_PARAMETER_SET(nt) || NAL_TYPE_IS_CODED_SLICE_SEGMENT(nt))
static GstBuffer *
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 NULL;
} 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 NULL;
}
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) {
/* prepend codec_data */
if (rtph265depay->codec_data) {
GST_DEBUG_OBJECT (depayload, "prepending codec_data");
gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph265depay),
rtph265depay->codec_data, outbuf,
g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
outbuf = gst_buffer_append (rtph265depay->codec_data, outbuf);
rtph265depay->codec_data = NULL;
out_keyframe = TRUE;
}
outbuf = gst_buffer_make_writable (outbuf);
gst_rtp_drop_meta (GST_ELEMENT_CAST (rtph265depay), outbuf,
g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
GST_BUFFER_PTS (outbuf) = out_timestamp;
if (out_keyframe)
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
return outbuf;
/* ERRORS */
short_nal:
{
GST_WARNING_OBJECT (depayload, "dropping short NAL");
gst_buffer_unmap (nal, &map);
gst_buffer_unref (nal);
return NULL;
}
}
static GstBuffer *
gst_rtp_h265_push_fragmentation_unit (GstRtpH265Depay * rtph265depay,
gboolean send)
{
guint outsize;
GstMapInfo map;
GstBuffer *outbuf;
outsize = gst_adapter_available (rtph265depay->adapter);
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 {
goto not_implemented;
}
gst_buffer_unmap (outbuf, &map);
rtph265depay->current_fu_type = 0;
outbuf = gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf,
rtph265depay->fu_timestamp, rtph265depay->fu_marker);
if (send && outbuf) {
gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph265depay), outbuf);
outbuf = NULL;
}
return outbuf;
not_implemented:
{
GST_ERROR_OBJECT (rtph265depay,
("Only bytestream format is currently supported."));
gst_buffer_unmap (outbuf, &map);
return NULL;
}
}
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;
}
{
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_push_fragmentation_unit (rtph265depay, TRUE);
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) {
nalu_size = (payload[0] << 8) | payload[1];
/* dont 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 {
goto not_implemented;
}
/* 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_meta (GST_ELEMENT_CAST (rtph265depay), outbuf,
rtp->buffer, g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
outbuf =
gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf, timestamp,
marker);
if (outbuf)
gst_adapter_push (rtph265depay->adapter, outbuf);
payload += nalu_size;
payload_len -= nalu_size;
}
outsize = gst_adapter_available (rtph265depay->adapter);
if (outsize > 0) {
outbuf = gst_adapter_take_buffer (rtph265depay->adapter, outsize);
outbuf =
gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf, timestamp,
marker);
}
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_push_fragmentation_unit (rtph265depay, TRUE);
rtph265depay->current_fu_type = nal_unit_type;
rtph265depay->fu_timestamp = timestamp;
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);
memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
map.data[sizeof (sync_bytes)] = nal_header >> 8;
map.data[sizeof (sync_bytes) + 1] = nal_header & 0xff;
gst_buffer_unmap (outbuf, &map);
gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph265depay), outbuf,
rtp->buffer, g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
GST_DEBUG_OBJECT (rtph265depay, "queueing %d bytes", outsize);
/* and assemble in the adapter */
gst_adapter_push (rtph265depay->adapter, outbuf);
} else {
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_meta (GST_ELEMENT_CAST (rtph265depay), outbuf,
rtp->buffer, g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
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) {
outbuf = gst_rtp_h265_push_fragmentation_unit (rtph265depay, FALSE);
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 {
goto not_implemented;
}
memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
gst_buffer_unmap (outbuf, &map);
gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph265depay), outbuf,
rtp->buffer, g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
outbuf = gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf, timestamp,
marker);
break;
}
}
}
return outbuf;
/* 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);
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);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
gboolean
gst_rtp_h265_depay_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (rtph265depay_debug, "rtph265depay", 0,
"H265 Video RTP Depayloader");
return gst_element_register (plugin, "rtph265depay",
GST_RANK_SECONDARY, GST_TYPE_RTP_H265_DEPAY);
}
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