/* GStreamer * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "gstrtph264pay.h" #define SPS_TYPE_ID 7 #define PPS_TYPE_ID 8 #define USE_MEMCMP GST_DEBUG_CATEGORY_STATIC (rtph264pay_debug); #define GST_CAT_DEFAULT (rtph264pay_debug) /* references: * * RFC 3984 */ /* elementfactory information */ static const GstElementDetails gst_rtp_h264pay_details = GST_ELEMENT_DETAILS ("RTP H264 payloader", "Codec/Payloader/Network", "Payload-encode H264 video into RTP packets (RFC 3984)", "Laurent Glayal "); static GstStaticPadTemplate gst_rtp_h264_pay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-h264") ); static GstStaticPadTemplate gst_rtp_h264_pay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "media = (string) \"video\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) 90000, " "encoding-name = (string) \"H264\"") ); #define GST_TYPE_H264_SCAN_MODE (gst_h264_scan_mode_get_type()) static GType gst_h264_scan_mode_get_type (void) { static GType h264_scan_mode_type = 0; static const GEnumValue h264_scan_modes[] = { {GST_H264_SCAN_MODE_BYTESTREAM, "Scan complete bytestream for NALUs (not implemented)", "bytestream"}, {GST_H264_SCAN_MODE_MULTI_NAL, "Buffers contain multiple complete NALUs", "multiple"}, {GST_H264_SCAN_MODE_SINGLE_NAL, "Buffers contain a single complete NALU", "single"}, {0, NULL, NULL}, }; if (!h264_scan_mode_type) { h264_scan_mode_type = g_enum_register_static ("GstH264PayScanMode", h264_scan_modes); } return h264_scan_mode_type; } #define DEFAULT_PROFILE_LEVEL_ID NULL #define DEFAULT_SPROP_PARAMETER_SETS NULL #define DEFAULT_SCAN_MODE GST_H264_SCAN_MODE_MULTI_NAL #define DEFAULT_BUFFER_LIST FALSE enum { PROP_0, PROP_PROFILE_LEVEL_ID, PROP_SPROP_PARAMETER_SETS, PROP_SCAN_MODE, PROP_BUFFER_LIST, PROP_LAST }; #define IS_ACCESS_UNIT(x) (((x) > 0x00) && ((x) < 0x06)) static void gst_rtp_h264_pay_finalize (GObject * object); static void gst_rtp_h264_pay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_rtp_h264_pay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static gboolean gst_rtp_h264_pay_setcaps (GstBaseRTPPayload * basepayload, GstCaps * caps); static GstFlowReturn gst_rtp_h264_pay_handle_buffer (GstBaseRTPPayload * pad, GstBuffer * buffer); GST_BOILERPLATE (GstRtpH264Pay, gst_rtp_h264_pay, GstBaseRTPPayload, GST_TYPE_BASE_RTP_PAYLOAD); static void gst_rtp_h264_pay_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_h264_pay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_h264_pay_sink_template)); gst_element_class_set_details (element_class, &gst_rtp_h264pay_details); } static void gst_rtp_h264_pay_class_init (GstRtpH264PayClass * klass) { GObjectClass *gobject_class; GstBaseRTPPayloadClass *gstbasertppayload_class; gobject_class = (GObjectClass *) klass; gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass; gobject_class->set_property = gst_rtp_h264_pay_set_property; gobject_class->get_property = gst_rtp_h264_pay_get_property; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PROFILE_LEVEL_ID, g_param_spec_string ("profile-level-id", "profile-level-id", "The base64 profile-level-id to set in out caps (set to NULL to " "extract from stream)", DEFAULT_PROFILE_LEVEL_ID, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SPROP_PARAMETER_SETS, g_param_spec_string ("sprop-parameter-sets", "sprop-parameter-sets", "The base64 sprop-parameter-sets to set in out caps (set to NULL to " "extract from stream)", DEFAULT_SPROP_PARAMETER_SETS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SCAN_MODE, g_param_spec_enum ("scan-mode", "Scan Mode", "How to scan the input buffers for NAL units. Performance can be " "increased when certain assumptions are made about the input buffers", GST_TYPE_H264_SCAN_MODE, DEFAULT_SCAN_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BUFFER_LIST, g_param_spec_boolean ("buffer-list", "Buffer List", "Use Buffer Lists", DEFAULT_BUFFER_LIST, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gobject_class->finalize = gst_rtp_h264_pay_finalize; gstbasertppayload_class->set_caps = gst_rtp_h264_pay_setcaps; gstbasertppayload_class->handle_buffer = gst_rtp_h264_pay_handle_buffer; GST_DEBUG_CATEGORY_INIT (rtph264pay_debug, "rtph264pay", 0, "H264 RTP Payloader"); } static void gst_rtp_h264_pay_init (GstRtpH264Pay * rtph264pay, GstRtpH264PayClass * klass) { rtph264pay->queue = g_queue_new (); rtph264pay->profile = 0; rtph264pay->sps = NULL; rtph264pay->pps = NULL; rtph264pay->scan_mode = GST_H264_SCAN_MODE_MULTI_NAL; rtph264pay->buffer_list = DEFAULT_BUFFER_LIST; } static void gst_rtp_h264_pay_finalize (GObject * object) { GstRtpH264Pay *rtph264pay; rtph264pay = GST_RTP_H264_PAY (object); g_queue_free (rtph264pay->queue); g_free (rtph264pay->sps); g_free (rtph264pay->pps); g_free (rtph264pay->profile_level_id); g_free (rtph264pay->sprop_parameter_sets); G_OBJECT_CLASS (parent_class)->finalize (object); } static gboolean gst_rtp_h264_pay_setcaps (GstBaseRTPPayload * basepayload, GstCaps * caps) { GstRtpH264Pay *rtph264pay; GstStructure *str; const GValue *value; guint8 *data; guint size; rtph264pay = GST_RTP_H264_PAY (basepayload); str = gst_caps_get_structure (caps, 0); /* we can only set the output caps when we found the sprops and profile * NALs */ gst_basertppayload_set_options (basepayload, "video", TRUE, "H264", 90000); /* packetized AVC video has a codec_data */ if ((value = gst_structure_get_value (str, "codec_data"))) { GstBuffer *buffer; GString *sprops; guint num_sps, num_pps; gint i, count, nal_size; gint profile; gchar *profile_str; GST_DEBUG_OBJECT (rtph264pay, "have packetized h264"); rtph264pay->packetized = TRUE; buffer = gst_value_get_buffer (value); data = GST_BUFFER_DATA (buffer); size = GST_BUFFER_SIZE (buffer); /* parse the avcC data */ if (size < 7) goto avcc_too_small; /* parse the version, this must be 1 */ if (data[0] != 1) goto wrong_version; /* AVCProfileIndication */ /* profile_compat */ /* AVCLevelIndication */ profile = (data[1] << 16) | (data[2] << 8) | data[3]; GST_DEBUG_OBJECT (rtph264pay, "profile %06x", profile); /* 6 bits reserved | 2 bits lengthSizeMinusOne */ /* this is the number of bytes in front of the NAL units to mark their * length */ rtph264pay->nal_length_size = (data[4] & 0x03) + 1; GST_DEBUG_OBJECT (rtph264pay, "nal length %u", rtph264pay->nal_length_size); /* 3 bits reserved | 5 bits numOfSequenceParameterSets */ num_sps = data[5] & 0x1f; GST_DEBUG_OBJECT (rtph264pay, "num SPS %u", num_sps); data += 6; size -= 6; /* create the sprop-parameter-sets */ sprops = g_string_new (""); count = 0; for (i = 0; i < num_sps; i++) { gchar *set; if (size < 2) goto avcc_error; nal_size = (data[0] << 8) | data[1]; data += 2; size -= 2; GST_LOG_OBJECT (rtph264pay, "SPS %d size %d", i, nal_size); if (size < nal_size) goto avcc_error; set = g_base64_encode (data, nal_size); g_string_append_printf (sprops, "%s%s", count ? "," : "", set); count++; g_free (set); data += nal_size; size -= nal_size; } if (size < 1) goto avcc_error; /* 8 bits numOfPictureParameterSets */ num_pps = data[0]; data += 1; size -= 1; GST_DEBUG_OBJECT (rtph264pay, "num PPS %u", num_pps); for (i = 0; i < num_pps; i++) { gchar *set; if (size < 2) goto avcc_error; nal_size = (data[0] << 8) | data[1]; data += 2; size -= 2; GST_LOG_OBJECT (rtph264pay, "PPS %d size %d", i, nal_size); if (size < nal_size) goto avcc_error; set = g_base64_encode (data, nal_size); g_string_append_printf (sprops, "%s%s", count ? "," : "", set); count++; g_free (set); data += nal_size; size -= nal_size; } GST_DEBUG_OBJECT (rtph264pay, "sprops %s", sprops->str); profile_str = g_strdup_printf ("%06x", profile); gst_basertppayload_set_outcaps (basepayload, "profile-level-id", G_TYPE_STRING, profile_str, "sprop-parameter-sets", G_TYPE_STRING, sprops->str, NULL); g_free (profile_str); g_string_free (sprops, TRUE); } else { GST_DEBUG_OBJECT (rtph264pay, "have bytestream h264"); rtph264pay->packetized = FALSE; } return TRUE; avcc_too_small: { GST_ERROR_OBJECT (rtph264pay, "avcC size %u < 7", size); return FALSE; } wrong_version: { GST_ERROR_OBJECT (rtph264pay, "wrong avcC version"); return FALSE; } avcc_error: { GST_ERROR_OBJECT (rtph264pay, "avcC too small "); return FALSE; } } static guint next_start_code (guint8 * data, guint size) { /* Boyer-Moore string matching algorithm, in a degenerative * sense because our search 'alphabet' is binary - 0 & 1 only. * This allow us to simplify the general BM algorithm to a very * simple form. */ /* assume 1 is in the 4th byte */ guint offset = 3; while (offset < size) { if (1 == data[offset]) { unsigned int shift = offset; if (0 == data[--shift]) { if (0 == data[--shift]) { if (0 == data[--shift]) { return shift; } } } /* The jump is always 4 because of the 1 previously matched. * All the 0's must be after this '1' matched at offset */ offset += 4; } else if (0 == data[offset]) { /* maybe next byte is 1? */ offset++; } else { /* can jump 4 bytes forward */ offset += 4; } /* at each iteration, we rescan in a backward manner until * we match 0.0.0.1 in reverse order. Since our search string * has only 2 'alpabets' (i.e. 0 & 1), we know that any * mismatch will force us to shift a fixed number of steps */ } GST_DEBUG ("Cannot find next NAL start code. returning %u", size); return size; } /* we don't use memcpy but this faster version (around 20%) because we need to * perform it on all data. */ static gboolean is_nal_equal (const guint8 * nal1, const guint8 * nal2, guint len) { /* if we have a 64-bit processor, we may use guint64 to make * this go faster. Otherwise with 32 bits, we are already * going faster than byte to byte compare. */ guint remainder = len & 0x3; guint num_int = len >> 2; guint32 *pu1 = (guint32 *) nal1, *pu2 = (guint32 *) nal2; guint i; /* compare by groups of sizeof(guint32) bytes */ for (i = 0; i < num_int; i++) { /* XOR is faster than CMP?... */ if (pu1[i] ^ pu2[i]) return FALSE; } /* check that the remaining bytes are still equal */ if (!remainder) { return TRUE; } else if (1 == remainder) { --len; return (nal1[len] == nal2[len]); } else { /* 2 or 3 */ if (remainder & 1) { /* -1 if 3 bytes left */ --len; if (nal1[len] != nal2[len]) return FALSE; } /* last 2 bytes */ return ((nal1[len - 1] == nal2[len - 1]) /* -1 */ &&(nal1[len - 2] == nal2[len - 2])); /* -2 */ } } static gboolean gst_rtp_h264_pay_decode_nal (GstRtpH264Pay * payloader, guint8 * data, guint size) { guint8 *sps = NULL, *pps = NULL; guint sps_len = 0, pps_len = 0; guint8 header, type; guint len; gboolean updated; /* default is no update */ updated = FALSE; GST_DEBUG ("NAL payload len=%u", size); len = size; header = data[0]; type = header & 0x1f; /* keep sps & pps separately so that we can update either one * independently */ if (SPS_TYPE_ID == type) { /* encode the entire SPS NAL in base64 */ GST_DEBUG ("Found SPS %x %x %x Len=%u", (header >> 7), (header >> 5) & 3, type, len); sps = data; sps_len = len; } else if (PPS_TYPE_ID == type) { /* encoder the entire PPS NAL in base64 */ GST_DEBUG ("Found PPS %x %x %x Len = %u", (header >> 7), (header >> 5) & 3, type, len); pps = data; pps_len = len; } else { GST_DEBUG ("NAL: %x %x %x Len = %u", (header >> 7), (header >> 5) & 3, type, len); } /* If we encountered an SPS and/or a PPS, check if it's the * same as the one we have. If not, update our version and * set updated to TRUE */ if (sps_len > 0) { if ((payloader->sps_len != sps_len) || !is_nal_equal (payloader->sps, sps, sps_len)) { payloader->profile = (sps[1] << 16) + (sps[2] << 8) + sps[3]; GST_DEBUG ("Profile level IDC = %06x", payloader->profile); if (payloader->sps_len) g_free (payloader->sps); payloader->sps = sps_len ? g_new (guint8, sps_len) : NULL; memcpy (payloader->sps, sps, sps_len); payloader->sps_len = sps_len; updated = TRUE; } } if (pps_len > 0) { if ((payloader->pps_len != pps_len) || !is_nal_equal (payloader->pps, pps, pps_len)) { if (payloader->pps_len) g_free (payloader->pps); payloader->pps = pps_len ? g_new (guint8, pps_len) : NULL; memcpy (payloader->pps, pps, pps_len); payloader->pps_len = pps_len; updated = TRUE; } } return updated; } static void gst_rtp_h264_pay_set_sps_pps (GstBaseRTPPayload * basepayload) { GstRtpH264Pay *payloader = GST_RTP_H264_PAY (basepayload); gchar *profile; gchar *sps; gchar *pps; gchar *sprops; /* profile is 24 bit. Force it to respect the limit */ profile = g_strdup_printf ("%06x", payloader->profile & 0xffffff); /* build the sprop-parameter-sets */ sps = (payloader->sps_len > 0) ? g_base64_encode (payloader->sps, payloader->sps_len) : NULL; pps = (payloader->pps_len > 0) ? g_base64_encode (payloader->pps, payloader->pps_len) : NULL; if (sps) sprops = g_strjoin (",", sps, pps, NULL); else sprops = g_strdup (pps); gst_basertppayload_set_outcaps (basepayload, "profile-level-id", G_TYPE_STRING, profile, "sprop-parameter-sets", G_TYPE_STRING, sprops, NULL); GST_DEBUG ("outcaps udpate: profile=%s, sps=%s, pps=%s", profile, GST_STR_NULL (sps), GST_STR_NULL (pps)); g_free (sprops); g_free (profile); g_free (sps); g_free (pps); } static GstFlowReturn gst_rtp_h264_pay_payload_nal (GstBaseRTPPayload * basepayload, guint8 * data, guint size, GstClockTime timestamp, GstBuffer * buffer_orig) { GstRtpH264Pay *rtph264pay; GstFlowReturn ret; guint8 nalType; guint packet_len, payload_len, mtu; GstBuffer *outbuf; guint8 *payload; GstBufferList *list = NULL; GstBufferListIterator *it = NULL; rtph264pay = GST_RTP_H264_PAY (basepayload); mtu = GST_BASE_RTP_PAYLOAD_MTU (rtph264pay); nalType = data[0] & 0x1f; GST_DEBUG_OBJECT (rtph264pay, "Processing Buffer with NAL TYPE=%d", nalType); packet_len = gst_rtp_buffer_calc_packet_len (size, 0, 0); if (packet_len < mtu) { GST_DEBUG_OBJECT (basepayload, "NAL Unit fit in one packet datasize=%d mtu=%d", size, mtu); /* will fit in one packet */ if (rtph264pay->buffer_list) { /* use buffer lists * first create buffer without payload containing only the RTP header * and then another buffer containing the payload. both buffers will * be then added to the list */ outbuf = gst_rtp_buffer_new_allocate (0, 0, 0); } else { /* use the old-fashioned way with a single buffer and memcpy */ outbuf = gst_rtp_buffer_new_allocate (size, 0, 0); } /* only set the marker bit on packets containing access units */ if (IS_ACCESS_UNIT (nalType)) { gst_rtp_buffer_set_marker (outbuf, 1); } /* timestamp the outbuffer */ GST_BUFFER_TIMESTAMP (outbuf) = timestamp; if (rtph264pay->buffer_list) { GstBuffer *paybuf; /* create another buffer with the payload. */ paybuf = gst_buffer_create_sub (buffer_orig, data - GST_BUFFER_DATA (buffer_orig), size); list = gst_buffer_list_new (); it = gst_buffer_list_iterate (list); /* add both buffers to the buffer list */ gst_buffer_list_iterator_add_group (it); gst_buffer_list_iterator_add (it, outbuf); gst_buffer_list_iterator_add (it, paybuf); gst_buffer_list_iterator_free (it); /* push the list to the next element in the pipe */ ret = gst_basertppayload_push_list (basepayload, list); } else { payload = gst_rtp_buffer_get_payload (outbuf); GST_DEBUG_OBJECT (basepayload, "Copying %d bytes to outbuf", size); memcpy (payload, data, size); ret = gst_basertppayload_push (basepayload, outbuf); } } else { /* fragmentation Units FU-A */ guint8 nalHeader; guint limitedSize; int ii = 0, start = 1, end = 0, pos = 0; GST_DEBUG_OBJECT (basepayload, "NAL Unit DOES NOT fit in one packet datasize=%d mtu=%d", size, mtu); nalHeader = *data; pos++; size--; ret = GST_FLOW_OK; GST_DEBUG_OBJECT (basepayload, "Using FU-A fragmentation for data size=%d", size); /* We keep 2 bytes for FU indicator and FU Header */ payload_len = gst_rtp_buffer_calc_payload_len (mtu - 2, 0, 0); if (rtph264pay->buffer_list) { list = gst_buffer_list_new (); it = gst_buffer_list_iterate (list); } while (end == 0) { limitedSize = size < payload_len ? size : payload_len; GST_DEBUG_OBJECT (basepayload, "Inside FU-A fragmentation limitedSize=%d iteration=%d", limitedSize, ii); if (rtph264pay->buffer_list) { /* use buffer lists * first create buffer without payload containing only the RTP header * and then another buffer containing the payload. both buffers will * be then added to the list */ outbuf = gst_rtp_buffer_new_allocate (2, 0, 0); } else { /* use the old-fashioned way with a single buffer and memcpy * first create buffer to hold the payload */ outbuf = gst_rtp_buffer_new_allocate (limitedSize + 2, 0, 0); } GST_BUFFER_TIMESTAMP (outbuf) = timestamp; payload = gst_rtp_buffer_get_payload (outbuf); if (limitedSize == size) { GST_DEBUG_OBJECT (basepayload, "end size=%d iteration=%d", size, ii); end = 1; } if (IS_ACCESS_UNIT (nalType)) { gst_rtp_buffer_set_marker (outbuf, end); } /* FU indicator */ payload[0] = (nalHeader & 0x60) | 28; /* FU Header */ payload[1] = (start << 7) | (end << 6) | (nalHeader & 0x1f); if (rtph264pay->buffer_list) { GstBuffer *paybuf; /* create another buffer to hold the payload */ paybuf = gst_buffer_create_sub (buffer_orig, data - GST_BUFFER_DATA (buffer_orig) + pos, limitedSize); /* create a new group to hold the header and the payload */ gst_buffer_list_iterator_add_group (it); /* add both buffers to the buffer list */ gst_buffer_list_iterator_add (it, outbuf); gst_buffer_list_iterator_add (it, paybuf); } else { memcpy (&payload[2], data + pos, limitedSize); GST_DEBUG_OBJECT (basepayload, "recorded %d payload bytes into packet iteration=%d", limitedSize + 2, ii); ret = gst_basertppayload_push (basepayload, outbuf); if (ret != GST_FLOW_OK) break; } size -= limitedSize; pos += limitedSize; ii++; start = 0; } if (rtph264pay->buffer_list) { /* free iterator and push the whole buffer list at once */ gst_buffer_list_iterator_free (it); ret = gst_basertppayload_push_list (basepayload, list); } } return ret; } static GstFlowReturn gst_rtp_h264_pay_handle_buffer (GstBaseRTPPayload * basepayload, GstBuffer * buffer) { GstRtpH264Pay *rtph264pay; GstFlowReturn ret; guint size, nal_len; guint8 *data, *nal_data; GstClockTime timestamp; GQueue *nal_queue; rtph264pay = GST_RTP_H264_PAY (basepayload); /* the input buffer contains one or more NAL units */ size = GST_BUFFER_SIZE (buffer); data = GST_BUFFER_DATA (buffer); timestamp = GST_BUFFER_TIMESTAMP (buffer); ret = GST_FLOW_OK; GST_DEBUG_OBJECT (basepayload, "got %d bytes", size); /* now loop over all NAL units and put them in a packet * FIXME, we should really try to pack multiple NAL units into one RTP packet * if we can, especially for the config packets that wont't cause decoder * latency. */ if (rtph264pay->packetized) { guint nal_length_size; nal_length_size = rtph264pay->nal_length_size; while (size > nal_length_size) { gint i; nal_len = 0; for (i = 0; i < nal_length_size; i++) { nal_len = ((nal_len << 8) + data[i]); } /* skip the length bytes, make sure we don't run past the buffer size */ data += nal_length_size; size -= nal_length_size; if (size >= nal_len) { GST_DEBUG_OBJECT (basepayload, "got NAL of size %u", nal_len); } else { nal_len = size; GST_DEBUG_OBJECT (basepayload, "got incomplete NAL of size %u", nal_len); } ret = gst_rtp_h264_pay_payload_nal (basepayload, data, nal_len, timestamp, buffer); if (ret != GST_FLOW_OK) break; data += nal_len; size -= nal_len; } } else { guint next; gboolean update = FALSE; /* get offset of first start code */ next = next_start_code (data, size); /* skip to start code, if no start code is found, next will be size and we * will not collect data. */ data += next; size -= next; nal_data = data; nal_queue = rtph264pay->queue; GST_DEBUG_OBJECT (basepayload, "found first start at %u, bytes left %u", next, size); /* first pass to locate NALs and parse SPS/PPS */ while (size > 4) { /* skip start code */ data += 4; size -= 4; if (rtph264pay->scan_mode == GST_H264_SCAN_MODE_SINGLE_NAL) { /* we are told that there is only a single NAL in this packet so that we * can avoid scanning for the next NAL. */ next = size; } else { /* use next_start_code() to scan buffer. * next_start_code() returns the offset in data, * starting from zero to the first byte of 0.0.0.1 * If no start code is found, it returns the value of the * 'size' parameter. * data is unchanged by the call to next_start_code() */ next = next_start_code (data, size); } /* nal length is distance to next start code */ nal_len = next; GST_DEBUG_OBJECT (basepayload, "found next start at %u of size %u", next, nal_len); if (rtph264pay->profile_level_id != NULL && rtph264pay->sprop_parameter_sets != NULL) { if (rtph264pay->update_caps) { gst_basertppayload_set_outcaps (basepayload, "profile-level-id", G_TYPE_STRING, rtph264pay->profile_level_id, "sprop-parameter-sets", G_TYPE_STRING, rtph264pay->sprop_parameter_sets, NULL); rtph264pay->update_caps = FALSE; GST_DEBUG ("outcaps udpate: profile-level-id=%s, sprop-parameter-sets=%s", rtph264pay->profile_level_id, rtph264pay->sprop_parameter_sets); } } else { /* We know our stream is a valid H264 NAL packet, * go parse it for SPS/PPS to enrich the caps */ /* order: make sure to check nal */ update = gst_rtp_h264_pay_decode_nal (rtph264pay, data, nal_len) || update; } /* move to next NAL packet */ data += nal_len; size -= nal_len; g_queue_push_tail (nal_queue, GUINT_TO_POINTER (nal_len)); } /* if has new SPS & PPS, update the output caps */ if (G_UNLIKELY (update)) gst_rtp_h264_pay_set_sps_pps (basepayload); /* second pass to payload and push */ data = nal_data; while ((nal_len = GPOINTER_TO_UINT (g_queue_pop_head (nal_queue))) > 0) { /* skip start code */ data += 4; /* put the data in one or more RTP packets */ ret = gst_rtp_h264_pay_payload_nal (basepayload, data, nal_len, timestamp, buffer); if (ret != GST_FLOW_OK) { g_queue_clear (nal_queue); break; } /* move to next NAL packet */ data += nal_len; size -= nal_len; } } gst_buffer_unref (buffer); return ret; } static void gst_rtp_h264_pay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRtpH264Pay *rtph264pay; rtph264pay = GST_RTP_H264_PAY (object); switch (prop_id) { case PROP_PROFILE_LEVEL_ID: g_free (rtph264pay->profile_level_id); rtph264pay->profile_level_id = g_value_dup_string (value); rtph264pay->update_caps = TRUE; break; case PROP_SPROP_PARAMETER_SETS: g_free (rtph264pay->sprop_parameter_sets); rtph264pay->sprop_parameter_sets = g_value_dup_string (value); rtph264pay->update_caps = TRUE; break; case PROP_SCAN_MODE: rtph264pay->scan_mode = g_value_get_enum (value); break; case PROP_BUFFER_LIST: rtph264pay->buffer_list = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_rtp_h264_pay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRtpH264Pay *rtph264pay; rtph264pay = GST_RTP_H264_PAY (object); switch (prop_id) { case PROP_PROFILE_LEVEL_ID: g_value_set_string (value, rtph264pay->profile_level_id); break; case PROP_SPROP_PARAMETER_SETS: g_value_set_string (value, rtph264pay->sprop_parameter_sets); break; case PROP_SCAN_MODE: g_value_set_enum (value, rtph264pay->scan_mode); break; case PROP_BUFFER_LIST: g_value_set_boolean (value, rtph264pay->buffer_list); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } gboolean gst_rtp_h264_pay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtph264pay", GST_RANK_NONE, GST_TYPE_RTP_H264_PAY); }