diff options
Diffstat (limited to 'gst/rtp/gstrtpmpadec.c')
-rw-r--r-- | gst/rtp/gstrtpmpadec.c | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/gst/rtp/gstrtpmpadec.c b/gst/rtp/gstrtpmpadec.c new file mode 100644 index 00000000..970aed96 --- /dev/null +++ b/gst/rtp/gstrtpmpadec.c @@ -0,0 +1,272 @@ +/* GStreamer + * Copyright (C) <2005> Wim Taymans <wim@fluendo.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 + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <gst/rtp/gstrtpbuffer.h> + +#include <string.h> +#include "gstrtpmpadec.h" + +/* elementfactory information */ +static GstElementDetails gst_rtp_mpadec_details = { + "RTP packet parser", + "Codec/Parser/Network", + "Extracts MPEG audio from RTP packets", + "Wim Taymans <wim@fluendo.com>" +}; + +/* RtpMPADec signals and args */ +enum +{ + /* FILL ME */ + LAST_SIGNAL +}; + +enum +{ + ARG_0, + ARG_FREQUENCY +}; + +static GstStaticPadTemplate gst_rtpmpadec_src_template = +GST_STATIC_PAD_TEMPLATE ("src", + GST_PAD_SRC, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("audio/mpeg") + ); + +static GstStaticPadTemplate gst_rtpmpadec_sink_template = +GST_STATIC_PAD_TEMPLATE ("sink", + GST_PAD_SINK, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("application/x-rtp") + ); + + +static void gst_rtpmpadec_class_init (GstRtpMPADecClass * klass); +static void gst_rtpmpadec_base_init (GstRtpMPADecClass * klass); +static void gst_rtpmpadec_init (GstRtpMPADec * rtpmpadec); + +static GstFlowReturn gst_rtpmpadec_chain (GstPad * pad, GstBuffer * buffer); + +static void gst_rtpmpadec_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec); +static void gst_rtpmpadec_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec); + +static GstElementStateReturn gst_rtpmpadec_change_state (GstElement * element); + +static GstElementClass *parent_class = NULL; + +static GType +gst_rtpmpadec_get_type (void) +{ + static GType rtpmpadec_type = 0; + + if (!rtpmpadec_type) { + static const GTypeInfo rtpmpadec_info = { + sizeof (GstRtpMPADecClass), + (GBaseInitFunc) gst_rtpmpadec_base_init, + NULL, + (GClassInitFunc) gst_rtpmpadec_class_init, + NULL, + NULL, + sizeof (GstRtpMPADec), + 0, + (GInstanceInitFunc) gst_rtpmpadec_init, + }; + + rtpmpadec_type = + g_type_register_static (GST_TYPE_ELEMENT, "GstRtpMPADec", + &rtpmpadec_info, 0); + } + return rtpmpadec_type; +} + +static void +gst_rtpmpadec_base_init (GstRtpMPADecClass * klass) +{ + GstElementClass *element_class = GST_ELEMENT_CLASS (klass); + + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&gst_rtpmpadec_src_template)); + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&gst_rtpmpadec_sink_template)); + + gst_element_class_set_details (element_class, &gst_rtp_mpadec_details); +} + +static void +gst_rtpmpadec_class_init (GstRtpMPADecClass * klass) +{ + GObjectClass *gobject_class; + GstElementClass *gstelement_class; + + gobject_class = (GObjectClass *) klass; + gstelement_class = (GstElementClass *) klass; + + parent_class = g_type_class_ref (GST_TYPE_ELEMENT); + + gobject_class->set_property = gst_rtpmpadec_set_property; + gobject_class->get_property = gst_rtpmpadec_get_property; + + gstelement_class->change_state = gst_rtpmpadec_change_state; +} + +static void +gst_rtpmpadec_init (GstRtpMPADec * rtpmpadec) +{ + rtpmpadec->srcpad = + gst_pad_new_from_template (gst_static_pad_template_get + (&gst_rtpmpadec_src_template), "src"); + gst_element_add_pad (GST_ELEMENT (rtpmpadec), rtpmpadec->srcpad); + + rtpmpadec->sinkpad = + gst_pad_new_from_template (gst_static_pad_template_get + (&gst_rtpmpadec_sink_template), "sink"); + gst_pad_set_chain_function (rtpmpadec->sinkpad, gst_rtpmpadec_chain); + gst_element_add_pad (GST_ELEMENT (rtpmpadec), rtpmpadec->sinkpad); +} + +static GstFlowReturn +gst_rtpmpadec_chain (GstPad * pad, GstBuffer * buf) +{ + GstRtpMPADec *rtpmpadec; + GstBuffer *outbuf; + guint8 pt; + GstFlowReturn ret; + + rtpmpadec = GST_RTP_MPA_DEC (GST_OBJECT_PARENT (pad)); + + if (!gst_rtpbuffer_validate (buf)) + goto bad_packet; + + if ((pt = gst_rtpbuffer_get_payload_type (buf)) != GST_RTP_PAYLOAD_MPA) + goto bad_payload; + + + { + gint payload_len; + guint8 *payload; + guint16 frag_offset; + guint32 timestamp; + + payload_len = gst_rtpbuffer_get_payload_len (buf); + payload = gst_rtpbuffer_get_payload (buf); + + frag_offset = (payload[2] << 8) | payload[3]; + + /* strip off header */ + payload_len -= 4; + payload += 4; + + timestamp = gst_rtpbuffer_get_timestamp (buf); + + outbuf = gst_buffer_new_and_alloc (payload_len); + + //GST_BUFFER_TIMESTAMP (outbuf) = timestamp * GST_SECOND / 90000; + + memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len); + + GST_DEBUG ("gst_rtpmpadec_chain: pushing buffer of size %d", + GST_BUFFER_SIZE (outbuf)); + + gst_buffer_unref (buf); + + ret = gst_pad_push (rtpmpadec->srcpad, outbuf); + } + + return ret; + +bad_packet: + { + GST_DEBUG ("Packet did not validate"); + gst_buffer_unref (buf); + return GST_FLOW_ERROR; + } +bad_payload: + { + GST_DEBUG ("Unexpected payload type %u", pt); + gst_buffer_unref (buf); + return GST_FLOW_ERROR; + } +} + +static void +gst_rtpmpadec_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec) +{ + GstRtpMPADec *rtpmpadec; + + rtpmpadec = GST_RTP_MPA_DEC (object); + + switch (prop_id) { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +gst_rtpmpadec_get_property (GObject * object, guint prop_id, GValue * value, + GParamSpec * pspec) +{ + GstRtpMPADec *rtpmpadec; + + rtpmpadec = GST_RTP_MPA_DEC (object); + + switch (prop_id) { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static GstElementStateReturn +gst_rtpmpadec_change_state (GstElement * element) +{ + GstRtpMPADec *rtpmpadec; + gint transition; + GstElementStateReturn ret; + + rtpmpadec = GST_RTP_MPA_DEC (element); + transition = GST_STATE_TRANSITION (element); + + switch (transition) { + case GST_STATE_NULL_TO_READY: + break; + default: + break; + } + + ret = GST_ELEMENT_CLASS (parent_class)->change_state (element); + + switch (transition) { + case GST_STATE_READY_TO_NULL: + break; + default: + break; + } + return ret; +} + +gboolean +gst_rtpmpadec_plugin_init (GstPlugin * plugin) +{ + return gst_element_register (plugin, "rtpmpadec", + GST_RANK_NONE, GST_TYPE_RTP_MPA_DEC); +} |