/* GStreamer * Copyright (C) <2006> Wim Taymans * Copyright (C) <2014> Jurgen Slowack * * 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 #include #include #include #include "gstrtph265depay.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, GstBuffer * buf); 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 "); gstelement_class->change_state = gst_rtp_h265_depay_change_state; gstrtpbasedepayload_class->process = 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); } res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay), srccaps); gst_caps_unref (srccaps); 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 (sps_id == tmp_sps_id && 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; } 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"); outbuf = gst_buffer_append (rtph265depay->codec_data, outbuf); rtph265depay->codec_data = NULL; out_keyframe = TRUE; } outbuf = gst_buffer_make_writable (outbuf); GST_BUFFER_TIMESTAMP (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, GstBuffer * buf) { GstRtpH265Depay *rtph265depay; GstBuffer *outbuf = NULL; guint8 nal_unit_type; GstRTPBuffer rtp = { NULL }; rtph265depay = GST_RTP_H265_DEPAY (depayload); /* flush remaining data on discont */ if (GST_BUFFER_IS_DISCONT (buf)) { 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_TIMESTAMP (buf); gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp); 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_adapter_push (rtph265depay->adapter, outbuf); payload += nalu_size; payload_len -= nalu_size; } outsize = gst_adapter_available (rtph265depay->adapter); 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_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_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); outbuf = gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf, timestamp, marker); break; } } gst_rtp_buffer_unmap (&rtp); } return outbuf; /* ERRORS */ empty_packet: { GST_DEBUG_OBJECT (rtph265depay, "empty packet"); gst_rtp_buffer_unmap (&rtp); return NULL; } waiting_start: { GST_DEBUG_OBJECT (rtph265depay, "waiting for start"); gst_rtp_buffer_unmap (&rtp); return NULL; } #if 0 not_implemented_donl_present: { GST_ELEMENT_ERROR (rtph265depay, STREAM, FORMAT, (NULL), ("DONL field present not supported yet")); gst_rtp_buffer_unmap (&rtp); return NULL; } #endif not_implemented: { GST_ELEMENT_ERROR (rtph265depay, STREAM, FORMAT, (NULL), ("NAL unit type %d not supported yet", nal_unit_type)); gst_rtp_buffer_unmap (&rtp); 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); }