gstreamer/ext/avtp/gstavtpsrc.c

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/*
* GStreamer AVTP Plugin
* Copyright (C) 2019 Intel Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:element-avtpsrc
* @see_also: avtpsink
*
* avtpsrc is a network source that receives AVTPDUs from the network. It
* should be combined with AVTP depayloaders to implement an AVTP listener.
* For more information see https://standards.ieee.org/standard/1722-2016.html.
*
* <note>
* Applications must have CAP_NET_RAW capability in order to successfully use
* this element. See avtpsink documentation for further information.
* </note>
*
* <refsect2>
* <title>Example pipeline</title>
* |[
* gst-launch-1.0 avtpsrc ! avtpaafdepay ! autoaudiosink
* ]| This example pipeline implements an AVTP listener that plays an AAF
* stream back.
* </refsect2>
*/
#include <arpa/inet.h>
#include <linux/if_packet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <unistd.h>
#include "gstavtpsrc.h"
GST_DEBUG_CATEGORY_STATIC (avtpsrc_debug);
#define GST_CAT_DEFAULT (avtpsrc_debug)
#define DEFAULT_IFNAME "eth0"
#define DEFAULT_ADDRESS "01:AA:AA:AA:AA:AA"
#define MAX_AVTPDU_SIZE 1500
enum
{
PROP_0,
PROP_IFNAME,
PROP_ADDRESS,
};
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-avtp")
);
#define gst_avtp_src_parent_class parent_class
G_DEFINE_TYPE (GstAvtpSrc, gst_avtp_src, GST_TYPE_PUSH_SRC);
static void gst_avtp_src_finalize (GObject * gobject);
static void gst_avtp_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_avtp_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_avtp_src_start (GstBaseSrc * basesrc);
static gboolean gst_avtp_src_stop (GstBaseSrc * basesrc);
static GstFlowReturn gst_avtp_src_fill (GstPushSrc * pushsrc, GstBuffer *
buffer);
static void
gst_avtp_src_class_init (GstAvtpSrcClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseSrcClass *basesrc_class = GST_BASE_SRC_CLASS (klass);
GstPushSrcClass *pushsrc_class = GST_PUSH_SRC_CLASS (klass);
object_class->finalize = gst_avtp_src_finalize;
object_class->get_property = gst_avtp_src_get_property;
object_class->set_property = gst_avtp_src_set_property;
g_object_class_install_property (object_class, PROP_IFNAME,
g_param_spec_string ("ifname", "Interface Name",
"Network interface utilized to receive AVTPDUs",
DEFAULT_IFNAME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
g_object_class_install_property (object_class, PROP_ADDRESS,
g_param_spec_string ("address", "Destination MAC address",
"Destination MAC address to listen to",
DEFAULT_ADDRESS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
gst_element_class_add_static_pad_template (element_class, &src_template);
gst_element_class_set_static_metadata (element_class,
"Audio/Video Transport Protocol (AVTP) Source",
"Src/Network", "Receive AVTPDUs from the network",
"Andre Guedes <andre.guedes@intel.com>");
basesrc_class->start = GST_DEBUG_FUNCPTR (gst_avtp_src_start);
basesrc_class->stop = GST_DEBUG_FUNCPTR (gst_avtp_src_stop);
pushsrc_class->fill = GST_DEBUG_FUNCPTR (gst_avtp_src_fill);
GST_DEBUG_CATEGORY_INIT (avtpsrc_debug, "avtpsrc", 0, "AVTP Source");
}
static void
gst_avtp_src_init (GstAvtpSrc * avtpsrc)
{
gst_base_src_set_live (GST_BASE_SRC (avtpsrc), TRUE);
gst_base_src_set_format (GST_BASE_SRC (avtpsrc), GST_FORMAT_TIME);
gst_base_src_set_blocksize (GST_BASE_SRC (avtpsrc), MAX_AVTPDU_SIZE);
avtpsrc->ifname = g_strdup (DEFAULT_IFNAME);
avtpsrc->address = g_strdup (DEFAULT_ADDRESS);
avtpsrc->sk_fd = -1;
}
static void
gst_avtp_src_finalize (GObject * object)
{
GstAvtpSrc *avtpsrc = GST_AVTP_SRC (object);
g_free (avtpsrc->ifname);
g_free (avtpsrc->address);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_avtp_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAvtpSrc *avtpsrc = GST_AVTP_SRC (object);
GST_DEBUG_OBJECT (avtpsrc, "prop_id %u", prop_id);
switch (prop_id) {
case PROP_IFNAME:
g_free (avtpsrc->ifname);
avtpsrc->ifname = g_value_dup_string (value);
break;
case PROP_ADDRESS:
g_free (avtpsrc->address);
avtpsrc->address = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_avtp_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAvtpSrc *avtpsrc = GST_AVTP_SRC (object);
GST_DEBUG_OBJECT (avtpsrc, "prop_id %u", prop_id);
switch (prop_id) {
case PROP_IFNAME:
g_value_set_string (value, avtpsrc->ifname);
break;
case PROP_ADDRESS:
g_value_set_string (value, avtpsrc->address);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_avtp_src_start (GstBaseSrc * basesrc)
{
int fd, res;
unsigned int index;
guint8 addr[ETH_ALEN];
struct sockaddr_ll sk_addr = { 0 };
struct packet_mreq mreq = { 0 };
GstAvtpSrc *avtpsrc = GST_AVTP_SRC (basesrc);
index = if_nametoindex (avtpsrc->ifname);
if (!index) {
GST_ERROR_OBJECT (avtpsrc, "Failed to get if_index: %s",
g_strerror (errno));
return FALSE;
}
fd = socket (AF_PACKET, SOCK_DGRAM, htons (ETH_P_TSN));
if (fd < 0) {
GST_ERROR_OBJECT (avtpsrc, "Failed to open socket: %s", g_strerror (errno));
return FALSE;
}
sk_addr.sll_family = AF_PACKET;
sk_addr.sll_protocol = htons (ETH_P_TSN);
sk_addr.sll_ifindex = index;
res = bind (fd, (struct sockaddr *) &sk_addr, sizeof (sk_addr));
if (res < 0) {
GST_ERROR_OBJECT (avtpsrc, "Failed to bind socket: %s", g_strerror (errno));
goto err;
}
res = sscanf (avtpsrc->address, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&addr[0], &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]);
if (res != 6) {
GST_ERROR_OBJECT (avtpsrc, "Destination MAC address format not valid");
goto err;
}
mreq.mr_ifindex = index;
mreq.mr_type = PACKET_MR_MULTICAST;
mreq.mr_alen = ETH_ALEN;
memcpy (&mreq.mr_address, addr, ETH_ALEN);
res = setsockopt (fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, &mreq,
sizeof (struct packet_mreq));
if (res < 0) {
GST_ERROR_OBJECT (avtpsrc, "Failed to set multicast address: %s",
g_strerror (errno));
goto err;
}
avtpsrc->sk_fd = fd;
GST_DEBUG_OBJECT (avtpsrc, "AVTP source started");
return TRUE;
err:
close (fd);
return FALSE;
}
static gboolean
gst_avtp_src_stop (GstBaseSrc * basesrc)
{
GstAvtpSrc *avtpsrc = GST_AVTP_SRC (basesrc);
close (avtpsrc->sk_fd);
GST_DEBUG_OBJECT (avtpsrc, "AVTP source stopped");
return TRUE;
}
static GstFlowReturn
gst_avtp_src_fill (GstPushSrc * pushsrc, GstBuffer * buffer)
{
GstMapInfo map;
gsize buffer_size;
ssize_t n = MAX_AVTPDU_SIZE;
GstAvtpSrc *avtpsrc = GST_AVTP_SRC (pushsrc);
buffer_size = gst_buffer_get_size (buffer);
if (G_UNLIKELY (buffer_size < MAX_AVTPDU_SIZE)) {
GST_WARNING_OBJECT (avtpsrc,
"Buffer size (%lu) may not be enough to hold AVTPDU (max AVTPDU size %d)",
buffer_size, MAX_AVTPDU_SIZE);
n = buffer_size;
}
if (!gst_buffer_map (buffer, &map, GST_MAP_WRITE)) {
GST_WARNING_OBJECT (avtpsrc, "Failed to map buffer");
return GST_FLOW_OK;
}
retry:
errno = 0;
n = recv (avtpsrc->sk_fd, map.data, n, 0);
if (n < 0) {
if (errno == EINTR) {
goto retry;
}
GST_ELEMENT_ERROR (avtpsrc, RESOURCE, READ, (NULL),
("Failed to receive AVTPDU: %s", g_strerror (errno)));
gst_buffer_unmap (buffer, &map);
return GST_FLOW_ERROR;
}
gst_buffer_unmap (buffer, &map);
return GST_FLOW_OK;
}
gboolean
gst_avtp_src_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "avtpsrc", GST_RANK_NONE,
GST_TYPE_AVTP_SRC);
}