gstreamer/gst/rtp/gstrtpisacdepay.c
2021-03-29 12:45:22 +02:00

147 lines
4.3 KiB
C

/* GStreamer
* Copyright (C) 2020 Collabora Ltd.
* Author: Guillaume Desmottes <guillaume.desmottes@collabora.com>, Collabora Ltd.
*
* 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.
*/
/**
* SECTION:element-rtpisacdepay
* @title: rtpisacdepay
* @short_description: iSAC RTP Depayloader
*
* Since: 1.20
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/audio/audio.h>
#include "gstrtpelements.h"
#include "gstrtpisacdepay.h"
#include "gstrtputils.h"
GST_DEBUG_CATEGORY_STATIC (rtpisacdepay_debug);
#define GST_CAT_DEFAULT (rtpisacdepay_debug)
static GstStaticPadTemplate gst_rtp_isac_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) { 16000, 32000 }, "
"encoding-name = (string) \"ISAC\"")
);
static GstStaticPadTemplate gst_rtp_isac_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/isac, "
"rate = (int) { 16000, 32000 }, " "channels = (int) 1")
);
struct _GstRtpIsacDepay
{
/*< private > */
GstRTPBaseDepayload parent;
guint64 packet;
};
#define gst_rtp_isac_depay_parent_class parent_class
G_DEFINE_TYPE (GstRtpIsacDepay, gst_rtp_isac_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpisacdepay, "rtpisacdepay",
GST_RANK_SECONDARY, GST_TYPE_RTP_ISAC_DEPAY, rtp_element_init (plugin));
static gboolean
gst_rtp_isac_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
{
GstCaps *src_caps;
GstStructure *s;
gint rate;
gboolean ret;
GST_DEBUG_OBJECT (depayload, "sink caps: %" GST_PTR_FORMAT, caps);
s = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (s, "clock-rate", &rate)) {
GST_ERROR_OBJECT (depayload, "Missing 'clock-rate' in caps");
return FALSE;
}
src_caps = gst_caps_new_simple ("audio/isac",
"channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, rate, NULL);
ret = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), src_caps);
GST_DEBUG_OBJECT (depayload,
"set caps on source: %" GST_PTR_FORMAT " (ret=%d)", src_caps, ret);
gst_caps_unref (src_caps);
return ret;
}
static GstBuffer *
gst_rtp_isac_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp_buffer)
{
GstBuffer *outbuf;
outbuf = gst_rtp_buffer_get_payload_buffer (rtp_buffer);
gst_rtp_drop_non_audio_meta (depayload, outbuf);
return outbuf;
}
static void
gst_rtp_isac_depay_class_init (GstRtpIsacDepayClass * klass)
{
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstRTPBaseDepayloadClass *depayload_class =
(GstRTPBaseDepayloadClass *) klass;
depayload_class->set_caps = gst_rtp_isac_depay_setcaps;
depayload_class->process_rtp_packet = gst_rtp_isac_depay_process;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_isac_depay_sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_isac_depay_src_template);
gst_element_class_set_static_metadata (gstelement_class,
"RTP iSAC depayloader", "Codec/Depayloader/Network/RTP",
"Extracts iSAC audio from RTP packets",
"Guillaume Desmottes <guillaume.desmottes@collabora.com>");
GST_DEBUG_CATEGORY_INIT (rtpisacdepay_debug, "rtpisacdepay", 0,
"iSAC RTP Depayloader");
}
static void
gst_rtp_isac_depay_init (GstRtpIsacDepay * rtpisacdepay)
{
}