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c3fac62611
Original commit message from CVS: fix descriptions and license blocks cut and paste anyone ?
285 lines
7.6 KiB
C
285 lines
7.6 KiB
C
/* GStreamer
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* Copyright (C) <2005> Wim Taymans <wim@fluendo.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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/* elementfactory information */
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static const GstElementDetails gst_rtp_mpadepay_details =
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GST_ELEMENT_DETAILS ("RTP packet parser",
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"Codec/Depayr/Network",
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"Extracts MPEG audio from RTP packets (RFC 2038)",
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"Wim Taymans <wim@fluendo.com>");
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/* RtpMPADepay signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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ARG_FREQUENCY
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};
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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")
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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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"clock-rate = (int) 90000, " "encoding-name = (string) \"MPA\"")
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);
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static void gst_rtp_mpa_depay_class_init (GstRtpMPADepayClass * klass);
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static void gst_rtp_mpa_depay_base_init (GstRtpMPADepayClass * klass);
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static void gst_rtp_mpa_depay_init (GstRtpMPADepay * rtpmpadepay);
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static GstFlowReturn gst_rtp_mpa_depay_chain (GstPad * pad, GstBuffer * buffer);
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static void gst_rtp_mpa_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rtp_mpa_depay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstStateChangeReturn gst_rtp_mpa_depay_change_state (GstElement *
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element, GstStateChange transition);
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static GstElementClass *parent_class = NULL;
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static GType
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gst_rtp_mpa_depay_get_type (void)
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{
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static GType rtpmpadepay_type = 0;
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if (!rtpmpadepay_type) {
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static const GTypeInfo rtpmpadepay_info = {
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sizeof (GstRtpMPADepayClass),
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(GBaseInitFunc) gst_rtp_mpa_depay_base_init,
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NULL,
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(GClassInitFunc) gst_rtp_mpa_depay_class_init,
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NULL,
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NULL,
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sizeof (GstRtpMPADepay),
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0,
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(GInstanceInitFunc) gst_rtp_mpa_depay_init,
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};
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rtpmpadepay_type =
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g_type_register_static (GST_TYPE_ELEMENT, "GstRtpMPADepay",
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&rtpmpadepay_info, 0);
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}
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return rtpmpadepay_type;
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}
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static void
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gst_rtp_mpa_depay_base_init (GstRtpMPADepayClass * 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 (element_class, &gst_rtp_mpadepay_details);
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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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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = gst_rtp_mpa_depay_set_property;
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gobject_class->get_property = gst_rtp_mpa_depay_get_property;
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gstelement_class->change_state = gst_rtp_mpa_depay_change_state;
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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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{
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rtpmpadepay->srcpad =
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gst_pad_new_from_static_template (&gst_rtp_mpa_depay_src_template, "src");
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gst_element_add_pad (GST_ELEMENT (rtpmpadepay), rtpmpadepay->srcpad);
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rtpmpadepay->sinkpad =
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gst_pad_new_from_static_template (&gst_rtp_mpa_depay_sink_template,
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"sink");
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gst_pad_set_chain_function (rtpmpadepay->sinkpad, gst_rtp_mpa_depay_chain);
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gst_element_add_pad (GST_ELEMENT (rtpmpadepay), rtpmpadepay->sinkpad);
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}
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static GstFlowReturn
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gst_rtp_mpa_depay_chain (GstPad * pad, GstBuffer * buf)
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{
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GstRtpMPADepay *rtpmpadepay;
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GstBuffer *outbuf;
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guint8 pt;
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GstFlowReturn ret;
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rtpmpadepay = GST_RTP_MPA_DEPAY (GST_OBJECT_PARENT (pad));
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if (!gst_rtp_buffer_validate (buf))
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goto bad_packet;
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if ((pt = gst_rtp_buffer_get_payload_type (buf)) != GST_RTP_PAYLOAD_MPA)
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goto bad_payload;
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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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guint32 timestamp;
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payload_len = gst_rtp_buffer_get_payload_len (buf);
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payload = gst_rtp_buffer_get_payload (buf);
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frag_offset = (payload[2] << 8) | payload[3];
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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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payload_len -= 4;
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payload += 4;
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timestamp = gst_rtp_buffer_get_timestamp (buf);
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outbuf = gst_buffer_new_and_alloc (payload_len);
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//GST_BUFFER_TIMESTAMP (outbuf) = timestamp * GST_SECOND / 90000;
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memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
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GST_DEBUG ("gst_rtp_mpa_depay_chain: pushing buffer of size %d",
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GST_BUFFER_SIZE (outbuf));
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gst_buffer_unref (buf);
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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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ret = gst_pad_push (rtpmpadepay->srcpad, outbuf);
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}
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return ret;
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bad_packet:
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{
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GST_DEBUG ("Packet did not validate");
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gst_buffer_unref (buf);
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return GST_FLOW_ERROR;
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}
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bad_payload:
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{
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GST_DEBUG ("Unexpected payload type %u", pt);
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gst_buffer_unref (buf);
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return GST_FLOW_ERROR;
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}
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}
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static void
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gst_rtp_mpa_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRtpMPADepay *rtpmpadepay;
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rtpmpadepay = GST_RTP_MPA_DEPAY (object);
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rtp_mpa_depay_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstRtpMPADepay *rtpmpadepay;
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rtpmpadepay = GST_RTP_MPA_DEPAY (object);
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstStateChangeReturn
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gst_rtp_mpa_depay_change_state (GstElement * element, GstStateChange transition)
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{
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GstRtpMPADepay *rtpmpadepay;
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GstStateChangeReturn ret;
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rtpmpadepay = GST_RTP_MPA_DEPAY (element);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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return ret;
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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_NONE, GST_TYPE_RTP_MPA_DEPAY);
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}
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