/* GStreamer * Copyright (C) <2009> Edward Hervey <bilboed@bilboed.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 <string.h> #include <gst/rtp/gstrtpbuffer.h> #include <gst/audio/audio.h> #include "gstrtpqdmdepay.h" #include "gstrtputils.h" GST_DEBUG_CATEGORY (rtpqdm2depay_debug); #define GST_CAT_DEFAULT rtpqdm2depay_debug static GstStaticPadTemplate gst_rtp_qdm2_depay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-qdm2") ); static GstStaticPadTemplate gst_rtp_qdm2_depay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "media = (string) \"audio\", " "encoding-name = (string)\"X-QDM\"") ); #define gst_rtp_qdm2_depay_parent_class parent_class G_DEFINE_TYPE (GstRtpQDM2Depay, gst_rtp_qdm2_depay, GST_TYPE_RTP_BASE_DEPAYLOAD); static const guint8 headheader[20] = { 0x0, 0x0, 0x0, 0xc, 0x66, 0x72, 0x6d, 0x61, 0x51, 0x44, 0x4d, 0x32, 0x0, 0x0, 0x0, 0x24, 0x51, 0x44, 0x43, 0x41 }; static void gst_rtp_qdm2_depay_finalize (GObject * object); static GstStateChangeReturn gst_rtp_qdm2_depay_change_state (GstElement * element, GstStateChange transition); static GstBuffer *gst_rtp_qdm2_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp); gboolean gst_rtp_qdm2_depay_setcaps (GstRTPBaseDepayload * filter, GstCaps * caps); static void gst_rtp_qdm2_depay_class_init (GstRtpQDM2DepayClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstRTPBaseDepayloadClass *gstrtpbasedepayload_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass; gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_qdm2_depay_process; gstrtpbasedepayload_class->set_caps = gst_rtp_qdm2_depay_setcaps; gobject_class->finalize = gst_rtp_qdm2_depay_finalize; gstelement_class->change_state = gst_rtp_qdm2_depay_change_state; gst_element_class_add_static_pad_template (gstelement_class, &gst_rtp_qdm2_depay_src_template); gst_element_class_add_static_pad_template (gstelement_class, &gst_rtp_qdm2_depay_sink_template); gst_element_class_set_static_metadata (gstelement_class, "RTP QDM2 depayloader", "Codec/Depayloader/Network/RTP", "Extracts QDM2 audio from RTP packets (no RFC)", "Edward Hervey <bilboed@bilboed.com>"); } static void gst_rtp_qdm2_depay_init (GstRtpQDM2Depay * rtpqdm2depay) { rtpqdm2depay->adapter = gst_adapter_new (); } static void gst_rtp_qdm2_depay_finalize (GObject * object) { GstRtpQDM2Depay *rtpqdm2depay; rtpqdm2depay = GST_RTP_QDM2_DEPAY (object); g_object_unref (rtpqdm2depay->adapter); rtpqdm2depay->adapter = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } /* only on the sink */ gboolean gst_rtp_qdm2_depay_setcaps (GstRTPBaseDepayload * filter, GstCaps * caps) { GstStructure *structure = gst_caps_get_structure (caps, 0); gint clock_rate; if (!gst_structure_get_int (structure, "clock-rate", &clock_rate)) clock_rate = 44100; /* default */ filter->clock_rate = clock_rate; /* will set caps later */ return TRUE; } static void flush_data (GstRtpQDM2Depay * depay) { guint i; guint avail; if ((avail = gst_adapter_available (depay->adapter))) gst_adapter_flush (depay->adapter, avail); GST_DEBUG ("Flushing %d packets", depay->nbpackets); for (i = 0; depay->packets[i]; i++) { QDM2Packet *pack = depay->packets[i]; guint32 crc = 0; int i = 0; GstBuffer *buf; guint8 *data; /* CRC is the sum of everything (including first bytes) */ data = pack->data; if (G_UNLIKELY (data == NULL)) continue; /* If the packet size is bigger than 0xff, we need 2 bytes to store the size */ if (depay->packetsize > 0xff) { /* Expanded size 0x02 | 0x80 */ data[0] = 0x82; GST_WRITE_UINT16_BE (data + 1, depay->packetsize - 3); } else { data[0] = 0x2; data[1] = depay->packetsize - 2; } /* Calculate CRC */ for (; i < depay->packetsize; i++) crc += data[i]; GST_DEBUG ("CRC is 0x%x", crc); /* Write CRC */ if (depay->packetsize > 0xff) GST_WRITE_UINT16_BE (data + 3, crc); else GST_WRITE_UINT16_BE (data + 2, crc); GST_MEMDUMP ("Extracted packet", data, depay->packetsize); buf = gst_buffer_new (); gst_buffer_append_memory (buf, gst_memory_new_wrapped (0, data, depay->packetsize, 0, depay->packetsize, data, g_free)); gst_adapter_push (depay->adapter, buf); pack->data = NULL; } } static void add_packet (GstRtpQDM2Depay * depay, guint32 pid, guint32 len, guint8 * data) { QDM2Packet *packet; if (G_UNLIKELY (!depay->configured)) return; GST_DEBUG ("pid:%d, len:%d, data:%p", pid, len, data); if (G_UNLIKELY (depay->packets[pid] == NULL)) { depay->packets[pid] = g_malloc0 (sizeof (QDM2Packet)); depay->nbpackets = MAX (depay->nbpackets, pid + 1); } packet = depay->packets[pid]; GST_DEBUG ("packet:%p", packet); GST_DEBUG ("packet->data:%p", packet->data); if (G_UNLIKELY (packet->data == NULL)) { packet->data = g_malloc0 (depay->packetsize); /* We leave space for the header/crc */ if (depay->packetsize > 0xff) packet->offs = 5; else packet->offs = 4; } /* Finally copy the data over */ memcpy (packet->data + packet->offs, data, len); packet->offs += len; } static GstBuffer * gst_rtp_qdm2_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp) { GstRtpQDM2Depay *rtpqdm2depay; GstBuffer *outbuf = NULL; guint16 seq; rtpqdm2depay = GST_RTP_QDM2_DEPAY (depayload); { gint payload_len; guint8 *payload; guint avail; guint pos = 0; payload_len = gst_rtp_buffer_get_payload_len (rtp); if (payload_len < 3) goto bad_packet; payload = gst_rtp_buffer_get_payload (rtp); seq = gst_rtp_buffer_get_seq (rtp); if (G_UNLIKELY (seq != rtpqdm2depay->nextseq)) { GST_DEBUG ("GAP in sequence number, Resetting data !"); /* Flush previous data */ flush_data (rtpqdm2depay); /* And store new timestamp */ rtpqdm2depay->ptimestamp = rtpqdm2depay->timestamp; rtpqdm2depay->timestamp = GST_BUFFER_PTS (rtp->buffer); /* And that previous data will be pushed at the bottom */ } rtpqdm2depay->nextseq = seq + 1; GST_DEBUG ("Payload size %d 0x%x sequence:%d", payload_len, payload_len, seq); GST_MEMDUMP ("Incoming payload", payload, payload_len); while (pos < payload_len) { switch (payload[pos]) { case 0x80:{ GST_DEBUG ("Unrecognized 0x80 marker, skipping 12 bytes"); pos += 12; } break; case 0xff: /* HEADERS */ GST_DEBUG ("Headers"); /* Store the incoming timestamp */ rtpqdm2depay->ptimestamp = rtpqdm2depay->timestamp; rtpqdm2depay->timestamp = GST_BUFFER_PTS (rtp->buffer); /* flush the internal data if needed */ flush_data (rtpqdm2depay); if (G_UNLIKELY (!rtpqdm2depay->configured)) { guint8 *ourdata; GstBuffer *codecdata; GstMapInfo cmap; GstCaps *caps; /* First bytes are unknown */ GST_MEMDUMP ("Header", payload + pos, 32); ourdata = payload + pos + 10; pos += 10; rtpqdm2depay->channs = GST_READ_UINT32_BE (payload + pos + 4); rtpqdm2depay->samplerate = GST_READ_UINT32_BE (payload + pos + 8); rtpqdm2depay->bitrate = GST_READ_UINT32_BE (payload + pos + 12); rtpqdm2depay->blocksize = GST_READ_UINT32_BE (payload + pos + 16); rtpqdm2depay->framesize = GST_READ_UINT32_BE (payload + pos + 20); rtpqdm2depay->packetsize = GST_READ_UINT32_BE (payload + pos + 24); /* 16 bit empty block (0x02 0x00) */ pos += 30; GST_DEBUG ("channs:%d, samplerate:%d, bitrate:%d, blocksize:%d, framesize:%d, packetsize:%d", rtpqdm2depay->channs, rtpqdm2depay->samplerate, rtpqdm2depay->bitrate, rtpqdm2depay->blocksize, rtpqdm2depay->framesize, rtpqdm2depay->packetsize); /* Caps */ codecdata = gst_buffer_new_and_alloc (48); gst_buffer_map (codecdata, &cmap, GST_MAP_WRITE); memcpy (cmap.data, headheader, 20); memcpy (cmap.data + 20, ourdata, 28); gst_buffer_unmap (codecdata, &cmap); caps = gst_caps_new_simple ("audio/x-qdm2", "samplesize", G_TYPE_INT, 16, "rate", G_TYPE_INT, rtpqdm2depay->samplerate, "channels", G_TYPE_INT, rtpqdm2depay->channs, "codec_data", GST_TYPE_BUFFER, codecdata, NULL); gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), caps); gst_caps_unref (caps); rtpqdm2depay->configured = TRUE; } else { GST_DEBUG ("Already configured, skipping headers"); pos += 40; } break; default:{ /* Shuffled packet contents */ guint packetid = payload[pos++]; guint packettype = payload[pos++]; guint packlen = payload[pos++]; guint hsize = 2; GST_DEBUG ("Packet id:%d, type:0x%x, len:%d", packetid, packettype, packlen); /* Packets bigger than 0xff bytes have a type with the high bit set */ if (G_UNLIKELY (packettype & 0x80)) { packettype &= 0x7f; packlen <<= 8; packlen |= payload[pos++]; hsize = 3; GST_DEBUG ("Packet id:%d, type:0x%x, len:%d", packetid, packettype, packlen); } if (packettype > 0x7f) { GST_ERROR ("HOUSTON WE HAVE A PROBLEM !!!!"); } add_packet (rtpqdm2depay, packetid, packlen + hsize, payload + pos - hsize); pos += packlen; } } } GST_DEBUG ("final pos %d", pos); avail = gst_adapter_available (rtpqdm2depay->adapter); if (G_UNLIKELY (avail)) { GST_DEBUG ("Pushing out %d bytes of collected data", avail); outbuf = gst_adapter_take_buffer (rtpqdm2depay->adapter, avail); GST_BUFFER_PTS (outbuf) = rtpqdm2depay->ptimestamp; GST_DEBUG ("Outgoing buffer timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (rtpqdm2depay->ptimestamp)); } } return outbuf; /* ERRORS */ bad_packet: { GST_ELEMENT_WARNING (rtpqdm2depay, STREAM, DECODE, (NULL), ("Packet was too short")); return NULL; } } static GstStateChangeReturn gst_rtp_qdm2_depay_change_state (GstElement * element, GstStateChange transition) { GstRtpQDM2Depay *rtpqdm2depay; GstStateChangeReturn ret; rtpqdm2depay = GST_RTP_QDM2_DEPAY (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: gst_adapter_clear (rtpqdm2depay->adapter); 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_qdm2_depay_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (rtpqdm2depay_debug, "rtpqdm2depay", 0, "RTP QDM2 depayloader"); return gst_element_register (plugin, "rtpqdm2depay", GST_RANK_SECONDARY, GST_TYPE_RTP_QDM2_DEPAY); }