/* GStreamer * Copyright (C) <2006> Wim Taymans * * 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 */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "gstrtpmp4gpay.h" GST_DEBUG_CATEGORY (rtpmp4gpay_debug); #define GST_CAT_DEFAULT (rtpmp4gpay_debug) /* elementfactory information */ static GstElementDetails gst_rtp_mp4gpay_details = { "RTP packet parser", "Codec/Payloader/Network", "Payload MPEG4 elementary streams as RTP packets (RFC 3640)", "Wim Taymans " }; static GstStaticPadTemplate gst_rtp_mp4g_pay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/mpeg," "mpegversion=(int) 4," "systemstream=(boolean)false;" "audio/mpeg," "mpegversion=(int) 4") ); static GstStaticPadTemplate gst_rtp_mp4g_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) [ 96, 127 ], " "clock-rate = (int) [1, MAX ], " "encoding-name = (string) \"mpeg4-generic\", " /* required string params */ "streamtype = (string) { \"4\", \"5\" }, " /* 4 = video, 5 = audio */ "profile-level-id = (int) [1,MAX], " /* "config = (string) [1,MAX]" */ "mode = (string) { \"generic\", \"CELP-cbr\", \"CELP-vbr\", \"AAC-lbr\", \"AAC-hbr\" }, " /* Optional general parameters */ "objecttype = (int) [1,MAX], " "constantsize = (int) [1,MAX], " /* constant size of each AU */ "constantduration = (int) [1,MAX], " /* constant duration of each AU */ "maxdisplacement = (int) [1,MAX], " "de-interleavebuffersize: = (int) [1,MAX], " /* Optional configuration parameters */ "sizelength = (int) [1, 16], " /* max 16 bits, should be enough... */ "indexlength = (int) [1, 8], " "indexdeltalength = (int) [1, 8], " "ctsdeltalength = (int) [1, 64], " "dtsdeltalength = (int) [1, 64], " "randomaccessindication = (int) {0, 1}, " "streamstateindication = (int) [0, 64], " "auxiliarydatasizelength = (int) [0, 64]") ); enum { PROP_0, }; static void gst_rtp_mp4g_pay_class_init (GstRtpMP4GPayClass * klass); static void gst_rtp_mp4g_pay_base_init (GstRtpMP4GPayClass * klass); static void gst_rtp_mp4g_pay_init (GstRtpMP4GPay * rtpmp4gpay); static void gst_rtp_mp4g_pay_finalize (GObject * object); static void gst_rtp_mp4g_pay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_rtp_mp4g_pay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static gboolean gst_rtp_mp4g_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps); static GstFlowReturn gst_rtp_mp4g_pay_handle_buffer (GstBaseRTPPayload * payload, GstBuffer * buffer); static GstBaseRTPPayloadClass *parent_class = NULL; static GType gst_rtp_mp4g_pay_get_type (void) { static GType rtpmp4gpay_type = 0; if (!rtpmp4gpay_type) { static const GTypeInfo rtpmp4gpay_info = { sizeof (GstRtpMP4GPayClass), (GBaseInitFunc) gst_rtp_mp4g_pay_base_init, NULL, (GClassInitFunc) gst_rtp_mp4g_pay_class_init, NULL, NULL, sizeof (GstRtpMP4GPay), 0, (GInstanceInitFunc) gst_rtp_mp4g_pay_init, }; rtpmp4gpay_type = g_type_register_static (GST_TYPE_BASE_RTP_PAYLOAD, "GstRtpMP4GPay", &rtpmp4gpay_info, 0); } return rtpmp4gpay_type; } static void gst_rtp_mp4g_pay_base_init (GstRtpMP4GPayClass * klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_mp4g_pay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_mp4g_pay_sink_template)); gst_element_class_set_details (element_class, &gst_rtp_mp4gpay_details); } static void gst_rtp_mp4g_pay_class_init (GstRtpMP4GPayClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstBaseRTPPayloadClass *gstbasertppayload_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass; parent_class = g_type_class_ref (GST_TYPE_BASE_RTP_PAYLOAD); gobject_class->set_property = gst_rtp_mp4g_pay_set_property; gobject_class->get_property = gst_rtp_mp4g_pay_get_property; gobject_class->finalize = gst_rtp_mp4g_pay_finalize; gstbasertppayload_class->set_caps = gst_rtp_mp4g_pay_setcaps; gstbasertppayload_class->handle_buffer = gst_rtp_mp4g_pay_handle_buffer; GST_DEBUG_CATEGORY_INIT (rtpmp4gpay_debug, "rtpmp4gpay", 0, "MP4-generic RTP Payloader"); } static void gst_rtp_mp4g_pay_init (GstRtpMP4GPay * rtpmp4gpay) { rtpmp4gpay->adapter = gst_adapter_new (); rtpmp4gpay->rate = 90000; rtpmp4gpay->profile = 1; rtpmp4gpay->mode = ""; } static void gst_rtp_mp4g_pay_finalize (GObject * object) { GstRtpMP4GPay *rtpmp4gpay; rtpmp4gpay = GST_RTP_MP4G_PAY (object); g_object_unref (rtpmp4gpay->adapter); rtpmp4gpay->adapter = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static unsigned sampling_table[16] = { 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350, 0, 0, 0 }; static gboolean gst_rtp_mp4g_pay_parse_audio_config (GstRtpMP4GPay * rtpmp4gpay, GstBuffer * buffer) { guint8 *data; guint size; guint8 objectType; guint8 samplingIdx; guint8 channelCfg; data = GST_BUFFER_DATA (buffer); size = GST_BUFFER_SIZE (buffer); if (size < 2) goto too_short; /* only AAC LC for now */ objectType = (data[0] & 0xf8) >> 3; if (objectType != 2) goto unsupported_type; samplingIdx = ((data[0] & 0x07) << 1) | ((data[1] & 0x80) >> 7); /* only fixed values for now */ if (samplingIdx > 12 && samplingIdx != 15) goto wrong_freq; channelCfg = ((data[1] & 0x78) >> 3); if (channelCfg > 7) goto wrong_channels; /* rtp rate depends on sampling rate of the audio */ if (samplingIdx == 15) { if (size < 5) goto too_short; /* index of 15 means we get the rate in the next 24 bits */ rtpmp4gpay->rate = ((data[1] & 0x7f) << 17) | ((data[2]) << 9) | ((data[3]) << 1) | ((data[4] & 0x80) >> 7); } else { /* else use the rate from the table */ rtpmp4gpay->rate = sampling_table[samplingIdx]; } /* extra rtp params contain the number of channels */ rtpmp4gpay->params = channelCfg; /* audio stream type */ rtpmp4gpay->streamtype = 5; /* mode */ rtpmp4gpay->mode = "ACC-hbr"; /* profile (should be 1) */ rtpmp4gpay->profile = objectType - 1; GST_DEBUG_OBJECT (rtpmp4gpay, "objectType: %d, samplingIdx: %d (%d), channelCfg: %d", objectType, samplingIdx, rtpmp4gpay->rate, channelCfg); return TRUE; /* ERROR */ too_short: { GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, FORMAT, (NULL), ("config string too short")); return FALSE; } unsupported_type: { GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, NOT_IMPLEMENTED, (NULL), ("unsupported object type %d", objectType)); return FALSE; } wrong_freq: { GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, NOT_IMPLEMENTED, (NULL), ("unsupported frequency index %d", samplingIdx)); return FALSE; } wrong_channels: { GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, NOT_IMPLEMENTED, (NULL), ("unsupported number of channels %d", channelCfg)); return FALSE; } } #define VOS_STARTCODE 0x000001B0 static gboolean gst_rtp_mp4g_pay_parse_video_config (GstRtpMP4GPay * rtpmp4gpay, GstBuffer * buffer) { guint8 *data; guint size; guint32 code; data = GST_BUFFER_DATA (buffer); size = GST_BUFFER_SIZE (buffer); if (size < 5) goto too_short; code = GST_READ_UINT32_BE (data); if (code == VOS_STARTCODE) { /* get profile */ rtpmp4gpay->profile = data[4]; } else { GST_ELEMENT_WARNING (rtpmp4gpay, STREAM, FORMAT, (NULL), ("profile not found in config string")); rtpmp4gpay->profile = 1; } /* fixed rate */ rtpmp4gpay->rate = 90000; /* video stream type */ rtpmp4gpay->streamtype = 4; /* no params for video */ rtpmp4gpay->params = 0; /* mode */ rtpmp4gpay->mode = "generic"; GST_LOG_OBJECT (rtpmp4gpay, "profile %d", rtpmp4gpay->profile); return TRUE; /* ERROR */ too_short: { GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, FORMAT, (NULL), ("config string too short")); return FALSE; } } static void gst_rtp_mp4g_pay_new_caps (GstRtpMP4GPay * rtpmp4gpay) { gchar *config; GValue v = { 0 }; #define MP4GCAPS \ "streamtype", G_TYPE_INT, rtpmp4gpay->streamtype, \ "profile-level-id", G_TYPE_INT, rtpmp4gpay->profile, \ "mode", G_TYPE_STRING, rtpmp4gpay->mode, \ "config", G_TYPE_STRING, config, \ "sizelength", G_TYPE_INT, 13, \ "indexlength", G_TYPE_INT, 3, \ "indexdeltalength", G_TYPE_INT, 3, \ NULL g_value_init (&v, GST_TYPE_BUFFER); gst_value_set_buffer (&v, rtpmp4gpay->config); config = gst_value_serialize (&v); /* hmm, silly */ if (rtpmp4gpay->params) { gst_basertppayload_set_outcaps (GST_BASE_RTP_PAYLOAD (rtpmp4gpay), "encoding-params", G_TYPE_INT, rtpmp4gpay->params, MP4GCAPS); } else { gst_basertppayload_set_outcaps (GST_BASE_RTP_PAYLOAD (rtpmp4gpay), MP4GCAPS); } g_value_unset (&v); g_free (config); #undef MP4GCAPS } static gboolean gst_rtp_mp4g_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps) { GstRtpMP4GPay *rtpmp4gpay; GstStructure *structure; const GValue *codec_info; gboolean res = TRUE; rtpmp4gpay = GST_RTP_MP4G_PAY (payload); structure = gst_caps_get_structure (caps, 0); codec_info = gst_structure_get_value (structure, "codec_info"); if (codec_info) { GST_LOG_OBJECT (rtpmp4gpay, "got codec_info"); if (G_VALUE_TYPE (codec_info) == GST_TYPE_BUFFER) { GstBuffer *buffer; const gchar *name; buffer = gst_value_get_buffer (codec_info); GST_LOG_OBJECT (rtpmp4gpay, "configuring codec_info"); name = gst_structure_get_name (structure); /* parse buffer */ if (!strcmp (name, "audio/mpeg")) { res = gst_rtp_mp4g_pay_parse_audio_config (rtpmp4gpay, buffer); } else if (!strcmp (name, "video/mpeg")) { res = gst_rtp_mp4g_pay_parse_video_config (rtpmp4gpay, buffer); } else { res = FALSE; } if (!res) goto config_failed; /* now we can configure the buffer */ if (rtpmp4gpay->config) gst_buffer_unref (rtpmp4gpay->config); rtpmp4gpay->config = gst_buffer_copy (buffer); } } gst_basertppayload_set_options (payload, "video", TRUE, "mpeg4-generic", rtpmp4gpay->rate); gst_rtp_mp4g_pay_new_caps (rtpmp4gpay); return res; /* ERRORS */ config_failed: { GST_DEBUG_OBJECT (rtpmp4gpay, "failed to parse config"); return FALSE; } } static GstFlowReturn gst_rtp_mp4g_pay_flush (GstRtpMP4GPay * rtpmp4gpay) { guint avail, total; GstBuffer *outbuf; GstFlowReturn ret; gboolean fragmented; guint mtu; fragmented = FALSE; /* the data available in the adapter is either smaller * than the MTU or bigger. In the case it is smaller, the complete * adapter contents can be put in one packet. In the case the * adapter has more than one MTU, we need to fragment the MPEG data * over multiple packets. */ total = avail = gst_adapter_available (rtpmp4gpay->adapter); ret = GST_FLOW_OK; mtu = GST_BASE_RTP_PAYLOAD_MTU (rtpmp4gpay); while (avail > 0) { guint towrite; guint8 *payload; guint8 *data; guint payload_len; guint packet_len; /* this will be the total lenght of the packet */ packet_len = gst_rtp_buffer_calc_packet_len (avail, 0, 0); /* fill one MTU or all available bytes, we need 4 spare bytes for * the AU header. */ towrite = MIN (packet_len, mtu - 4); /* this is the payload length */ payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0); GST_DEBUG_OBJECT (rtpmp4gpay, "avail %d, towrite %d, packet_len %d, payload_len %d", avail, towrite, packet_len, payload_len); /* create buffer to hold the payload, also make room for the 4 header bytes. */ outbuf = gst_rtp_buffer_new_allocate (payload_len + 4, 0, 0); /* copy payload */ payload = gst_rtp_buffer_get_payload (outbuf); /* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+ * |AU-headers-length|AU-header|AU-header| |AU-header|padding| * | | (1) | (2) | | (n) | bits | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+ */ /* AU-headers-length, we only have 1 AU-header */ payload[0] = 0x00; payload[1] = 0x10; /* we use 16 bits for the header */ /* +---------------------------------------+ * | AU-size | * +---------------------------------------+ * | AU-Index / AU-Index-delta | * +---------------------------------------+ * | CTS-flag | * +---------------------------------------+ * | CTS-delta | * +---------------------------------------+ * | DTS-flag | * +---------------------------------------+ * | DTS-delta | * +---------------------------------------+ * | RAP-flag | * +---------------------------------------+ * | Stream-state | * +---------------------------------------+ */ /* The AU-header, no CTS, DTS, RAP, Stream-state * * AU-size is always the total size of the AU, not the fragmented size */ payload[2] = (total & 0x1fe0) >> 5; payload[3] = (total & 0x1f) << 3; /* we use 13 bits for the size, 3 bits index */ data = (guint8 *) gst_adapter_peek (rtpmp4gpay->adapter, payload_len); memcpy (&payload[4], data, payload_len); gst_adapter_flush (rtpmp4gpay->adapter, payload_len); /* marker only if the packet is complete */ gst_rtp_buffer_set_marker (outbuf, avail > payload_len); GST_BUFFER_TIMESTAMP (outbuf) = rtpmp4gpay->first_ts; ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtpmp4gpay), outbuf); avail -= payload_len; fragmented = TRUE; } return ret; } /* we expect buffers as exactly one complete AU */ static GstFlowReturn gst_rtp_mp4g_pay_handle_buffer (GstBaseRTPPayload * basepayload, GstBuffer * buffer) { GstRtpMP4GPay *rtpmp4gpay; GstFlowReturn ret; ret = GST_FLOW_OK; rtpmp4gpay = GST_RTP_MP4G_PAY (basepayload); rtpmp4gpay->first_ts = GST_BUFFER_TIMESTAMP (buffer); /* we always encode and flush a full AU */ gst_adapter_push (rtpmp4gpay->adapter, buffer); ret = gst_rtp_mp4g_pay_flush (rtpmp4gpay); return ret; } static void gst_rtp_mp4g_pay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRtpMP4GPay *rtpmp4gpay; rtpmp4gpay = GST_RTP_MP4G_PAY (object); switch (prop_id) { default: break; } } static void gst_rtp_mp4g_pay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRtpMP4GPay *rtpmp4gpay; rtpmp4gpay = GST_RTP_MP4G_PAY (object); switch (prop_id) { default: break; } } gboolean gst_rtp_mp4g_pay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtpmp4gpay", GST_RANK_NONE, GST_TYPE_RTP_MP4G_PAY); }