/* GStreamer * Copyright (C) <2009> Wim Taymans <wim.taymans@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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include <string.h> #include <stdlib.h> #include <gst/rtp/gstrtpbuffer.h> #include "gstrtpceltdepay.h" GST_DEBUG_CATEGORY_STATIC (rtpceltdepay_debug); #define GST_CAT_DEFAULT (rtpceltdepay_debug) /* RtpCELTDepay signals and args */ #define DEFAULT_FRAMESIZE 480 #define DEFAULT_CHANNELS 1 #define DEFAULT_CLOCKRATE 32000 enum { /* FILL ME */ LAST_SIGNAL }; enum { ARG_0 }; static GstStaticPadTemplate gst_rtp_celt_depay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "media = (string) \"audio\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) [32000, 48000], " "encoding-name = (string) \"CELT\"") ); static GstStaticPadTemplate gst_rtp_celt_depay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-celt") ); static GstBuffer *gst_rtp_celt_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf); static gboolean gst_rtp_celt_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps); GST_BOILERPLATE (GstRtpCELTDepay, gst_rtp_celt_depay, GstBaseRTPDepayload, GST_TYPE_BASE_RTP_DEPAYLOAD); static void gst_rtp_celt_depay_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_celt_depay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_celt_depay_sink_template)); gst_element_class_set_details_simple (element_class, "RTP CELT depayloader", "Codec/Depayloader/Network", "Extracts CELT audio from RTP packets", "Wim Taymans <wim.taymans@gmail.com>"); GST_DEBUG_CATEGORY_INIT (rtpceltdepay_debug, "rtpceltdepay", 0, "CELT RTP Depayloader"); } static void gst_rtp_celt_depay_class_init (GstRtpCELTDepayClass * klass) { GstBaseRTPDepayloadClass *gstbasertpdepayload_class; gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass; gstbasertpdepayload_class->process = gst_rtp_celt_depay_process; gstbasertpdepayload_class->set_caps = gst_rtp_celt_depay_setcaps; } static void gst_rtp_celt_depay_init (GstRtpCELTDepay * rtpceltdepay, GstRtpCELTDepayClass * klass) { } /* len 4 bytes LE, * vendor string (len bytes), * user_len 4 (0) bytes LE */ static const gchar gst_rtp_celt_comment[] = "\045\0\0\0Depayloaded with GStreamer celtdepay\0\0\0\0"; static gboolean gst_rtp_celt_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps) { GstStructure *structure; GstRtpCELTDepay *rtpceltdepay; gint clock_rate, nb_channels = 0, frame_size = 0; GstBuffer *buf; guint8 *data; const gchar *params; GstCaps *srccaps; gboolean res; rtpceltdepay = GST_RTP_CELT_DEPAY (depayload); structure = gst_caps_get_structure (caps, 0); if (!gst_structure_get_int (structure, "clock-rate", &clock_rate)) goto no_clockrate; depayload->clock_rate = clock_rate; if ((params = gst_structure_get_string (structure, "encoding-params"))) nb_channels = atoi (params); if (!nb_channels) nb_channels = DEFAULT_CHANNELS; if ((params = gst_structure_get_string (structure, "frame-size"))) frame_size = atoi (params); if (!frame_size) frame_size = DEFAULT_FRAMESIZE; rtpceltdepay->frame_size = frame_size; GST_DEBUG_OBJECT (depayload, "clock-rate=%d channels=%d frame-size=%d", clock_rate, nb_channels, frame_size); /* construct minimal header and comment packet for the decoder */ buf = gst_buffer_new_and_alloc (60); data = GST_BUFFER_DATA (buf); memcpy (data, "CELT ", 8); data += 8; memcpy (data, "1.1.12", 7); data += 20; GST_WRITE_UINT32_LE (data, 0x80000006); /* version */ data += 4; GST_WRITE_UINT32_LE (data, 56); /* header_size */ data += 4; GST_WRITE_UINT32_LE (data, clock_rate); /* rate */ data += 4; GST_WRITE_UINT32_LE (data, nb_channels); /* channels */ data += 4; GST_WRITE_UINT32_LE (data, frame_size); /* frame-size */ data += 4; GST_WRITE_UINT32_LE (data, -1); /* overlap */ data += 4; GST_WRITE_UINT32_LE (data, -1); /* bytes_per_packet */ data += 4; GST_WRITE_UINT32_LE (data, 0); /* extra headers */ srccaps = gst_caps_new_simple ("audio/x-celt", NULL); res = gst_pad_set_caps (depayload->srcpad, srccaps); gst_caps_unref (srccaps); gst_buffer_set_caps (buf, GST_PAD_CAPS (depayload->srcpad)); gst_base_rtp_depayload_push (GST_BASE_RTP_DEPAYLOAD (rtpceltdepay), buf); buf = gst_buffer_new_and_alloc (sizeof (gst_rtp_celt_comment)); memcpy (GST_BUFFER_DATA (buf), gst_rtp_celt_comment, sizeof (gst_rtp_celt_comment)); gst_buffer_set_caps (buf, GST_PAD_CAPS (depayload->srcpad)); gst_base_rtp_depayload_push (GST_BASE_RTP_DEPAYLOAD (rtpceltdepay), buf); return res; /* ERRORS */ no_clockrate: { GST_ERROR_OBJECT (depayload, "no clock-rate specified"); return FALSE; } } static GstBuffer * gst_rtp_celt_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf) { GstBuffer *outbuf = NULL; guint8 *payload; guint offset, pos, payload_len, total_size, size; guint8 s; gint clock_rate = 0, frame_size = 0; GstClockTime framesize_ns = 0, timestamp; guint n = 0; GstRtpCELTDepay *rtpceltdepay; rtpceltdepay = GST_RTP_CELT_DEPAY (depayload); clock_rate = depayload->clock_rate; frame_size = rtpceltdepay->frame_size; framesize_ns = gst_util_uint64_scale_int (frame_size, GST_SECOND, clock_rate); timestamp = GST_BUFFER_TIMESTAMP (buf); GST_LOG_OBJECT (depayload, "got %d bytes, mark %d ts %u seqn %d", GST_BUFFER_SIZE (buf), gst_rtp_buffer_get_marker (buf), gst_rtp_buffer_get_timestamp (buf), gst_rtp_buffer_get_seq (buf)); GST_LOG_OBJECT (depayload, "got clock-rate=%d, frame_size=%d, " "_ns=%" GST_TIME_FORMAT ", timestamp=%" GST_TIME_FORMAT, clock_rate, frame_size, GST_TIME_ARGS (framesize_ns), GST_TIME_ARGS (timestamp)); payload = gst_rtp_buffer_get_payload (buf); payload_len = gst_rtp_buffer_get_payload_len (buf); /* first count how many bytes are consumed by the size headers and make offset * point to the first data byte */ total_size = 0; offset = 0; while (total_size < payload_len) { do { s = payload[offset++]; total_size += s + 1; } while (s == 0xff); } /* offset is now pointing to the payload */ total_size = 0; pos = 0; while (total_size < payload_len) { n++; size = 0; do { s = payload[pos++]; size += s; total_size += size + 1; } while (s == 0xff); outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, offset, size); offset += size; if (frame_size != -1 && clock_rate != -1) { GST_BUFFER_TIMESTAMP (outbuf) = timestamp + framesize_ns * n; GST_BUFFER_DURATION (outbuf) = framesize_ns; } GST_LOG_OBJECT (depayload, "push timestamp=%" GST_TIME_FORMAT ", duration=%" GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)), GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf))); gst_base_rtp_depayload_push (depayload, outbuf); } return NULL; } gboolean gst_rtp_celt_depay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtpceltdepay", GST_RANK_MARGINAL, GST_TYPE_RTP_CELT_DEPAY); }