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183 lines
5.5 KiB
C
183 lines
5.5 KiB
C
/* GStreamer
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* Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/rtp/gstrtpbuffer.h>
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#include <string.h>
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#include "gstrtpmpadepay.h"
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GST_DEBUG_CATEGORY_STATIC (rtpmpadepay_debug);
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#define GST_CAT_DEFAULT (rtpmpadepay_debug)
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static GstStaticPadTemplate gst_rtp_mpa_depay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/mpeg, " "mpegversion = (int) 1")
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);
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static GstStaticPadTemplate gst_rtp_mpa_depay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp, "
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"media = (string) \"audio\", "
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"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"MPA\";"
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"application/x-rtp, "
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"media = (string) \"audio\", "
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"payload = (int) " GST_RTP_PAYLOAD_MPA_STRING ", "
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"clock-rate = (int) 90000")
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);
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GST_BOILERPLATE (GstRtpMPADepay, gst_rtp_mpa_depay, GstBaseRTPDepayload,
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GST_TYPE_BASE_RTP_DEPAYLOAD);
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static gboolean gst_rtp_mpa_depay_setcaps (GstBaseRTPDepayload * depayload,
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GstCaps * caps);
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static GstBuffer *gst_rtp_mpa_depay_process (GstBaseRTPDepayload * depayload,
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GstBuffer * buf);
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static void
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gst_rtp_mpa_depay_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_mpa_depay_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_mpa_depay_sink_template));
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gst_element_class_set_details_simple (element_class,
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"RTP MPEG audio depayloader", "Codec/Depayloader/Network",
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"Extracts MPEG audio from RTP packets (RFC 2038)",
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"Wim Taymans <wim.taymans@gmail.com>");
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}
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static void
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gst_rtp_mpa_depay_class_init (GstRtpMPADepayClass * klass)
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{
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GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
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gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
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gstbasertpdepayload_class->set_caps = gst_rtp_mpa_depay_setcaps;
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gstbasertpdepayload_class->process = gst_rtp_mpa_depay_process;
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GST_DEBUG_CATEGORY_INIT (rtpmpadepay_debug, "rtpmpadepay", 0,
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"MPEG Audio RTP Depayloader");
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}
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static void
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gst_rtp_mpa_depay_init (GstRtpMPADepay * rtpmpadepay,
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GstRtpMPADepayClass * klass)
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{
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/* needed because of GST_BOILERPLATE */
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}
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static gboolean
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gst_rtp_mpa_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
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{
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GstStructure *structure;
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GstCaps *outcaps;
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gint clock_rate;
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gboolean res;
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structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
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clock_rate = 90000;
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depayload->clock_rate = clock_rate;
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outcaps =
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gst_caps_new_simple ("audio/mpeg", "mpegversion", G_TYPE_INT, 1, NULL);
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res = gst_pad_set_caps (depayload->srcpad, outcaps);
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gst_caps_unref (outcaps);
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return res;
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}
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static GstBuffer *
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gst_rtp_mpa_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
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{
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GstRtpMPADepay *rtpmpadepay;
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GstBuffer *outbuf;
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rtpmpadepay = GST_RTP_MPA_DEPAY (depayload);
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{
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gint payload_len;
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guint8 *payload;
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guint16 frag_offset;
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gboolean marker;
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payload_len = gst_rtp_buffer_get_payload_len (buf);
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if (payload_len <= 4)
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goto empty_packet;
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payload = gst_rtp_buffer_get_payload (buf);
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/* strip off header
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | MBZ | Frag_offset |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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frag_offset = (payload[2] << 8) | payload[3];
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/* subbuffer skipping the 4 header bytes */
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outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 4, -1);
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marker = gst_rtp_buffer_get_marker (buf);
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if (marker) {
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/* mark start of talkspurt with discont */
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GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
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}
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GST_DEBUG_OBJECT (rtpmpadepay,
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"gst_rtp_mpa_depay_chain: pushing buffer of size %d",
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GST_BUFFER_SIZE (outbuf));
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/* FIXME, we can push half mpeg frames when they are split over multiple
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* RTP packets */
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return outbuf;
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}
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return NULL;
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/* ERRORS */
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empty_packet:
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{
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GST_ELEMENT_WARNING (rtpmpadepay, STREAM, DECODE,
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("Empty Payload."), (NULL));
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return NULL;
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}
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}
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gboolean
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gst_rtp_mpa_depay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtpmpadepay",
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GST_RANK_MARGINAL, GST_TYPE_RTP_MPA_DEPAY);
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}
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