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Purism-Calls/plugins/sip/calls-sip-media-pipeline.c
Evangelos Ribeiro Tzaras aa446f8218 sip: pipeline: Unify send and receive pipeline 
Using a single pipeline makes implementing encryption easier because we don't
need to duplicate srtpenc and srtpdec elements for each direction.

It also makes it easier to switch to using farstream down the line (see #426).
2022-04-12 08:03:49 +00:00

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/*
* Copyright (C) 2021-2022 Purism SPC
*
* This file is part of Calls.
*
* Calls is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Calls 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Calls. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Evangelos Ribeiro Tzaras <evangelos.tzaras@puri.sm>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#define G_LOG_DOMAIN "CallsSipMediaPipeline"
#include "calls-media-pipeline-enums.h"
#include "calls-sip-media-pipeline.h"
#include "util.h"
#include <gst/gst.h>
#include <gio/gio.h>
#define MAKE_ELEMENT(var, element, name) \
self->var = gst_element_factory_make (element, name); \
if (!self->var) { \
if (error) \
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, \
"Could not create '%s' element of type %s", \
name ? : "unnamed", element); \
return FALSE; \
}
/**
* SECTION:sip-media-pipeline
* @short_description:
* @Title:
*
* #CallsSipMediaPipeline is responsible for building Gstreamer pipelines.
* Usually a sender and receiver pipeline is employed.
*
* The sender pipeline records audio and uses RTP to send it out over the network
* to the specified host.
* The receiver pipeline receives RTP from the network and plays the audio
* on the system.
*
* Both pipelines are using RTCP.
*/
/* The following defines are used to set/reset bitmaps of playing/paused/stop state */
#define EL_PIPELINE (1<<0)
#define EL_RTPBIN (1<<1)
#define EL_RTP_SRC (1<<2)
#define EL_RTP_SINK (1<<3)
#define EL_RTCP_SRC (1<<4)
#define EL_RTCP_SINK (1<<5)
#define EL_SRTP_ENCODER (1<<6)
#define EL_SRTP_DECODER (1<<7)
#define EL_AUDIO_SRC (1<<8)
#define EL_AUDIO_SINK (1<<9)
#define EL_PAYLOADER (1<<10)
#define EL_DEPAYLOADER (1<<11)
#define EL_ENCODER (1<<12)
#define EL_DECODER (1<<13)
#define EL_SENDING \
(EL_AUDIO_SRC | EL_ENCODER | EL_PAYLOADER | \
EL_RTPBIN | EL_RTP_SINK | EL_RTCP_SINK)
#define EL_ALL_RTP \
(EL_PIPELINE | EL_RTPBIN | \
EL_RTP_SRC | EL_RTP_SINK | EL_RTCP_SRC | EL_RTCP_SINK | \
EL_AUDIO_SRC | EL_AUDIO_SINK | \
EL_ENCODER | EL_DECODER | EL_PAYLOADER | EL_DEPAYLOADER)
#define EL_ALL_SRTP (EL_ALL_RTP | EL_SRTP_ENCODER | EL_SRTP_DECODER)
enum {
PROP_0,
PROP_CODEC,
PROP_REMOTE,
PROP_RPORT_RTP,
PROP_RPORT_RTCP,
PROP_DEBUG,
PROP_STATE,
PROP_LAST_PROP,
};
enum {
SENDING_STARTED,
N_SIGNALS
};
static GParamSpec *props[PROP_LAST_PROP];
static uint signals[N_SIGNALS];
struct _CallsSipMediaPipeline {
GObject parent;
MediaCodecInfo *codec;
gboolean debug;
CallsMediaPipelineState state;
uint element_map_playing;
uint element_map_paused;
uint element_map_stopped;
gboolean emitted_sending_signal;
/* Connection details */
char *remote;
gint rport_rtp;
gint rport_rtcp;
GstElement *pipeline;
GstElement *rtpbin;
GstElement *rtp_src;
GstElement *rtp_sink;
GstElement *rtcp_sink;
GstElement *rtcp_src;
GstElement *audio_src;
GstElement *payloader;
GstElement *encoder;
GstElement *audio_sink;
GstElement *depayloader;
GstElement *decoder;
/* Gstreamer busses */
GstBus *bus;
guint bus_watch_id;
};
#if GLIB_CHECK_VERSION(2, 70, 0)
G_DEFINE_FINAL_TYPE (CallsSipMediaPipeline, calls_sip_media_pipeline, G_TYPE_OBJECT)
#else
G_DEFINE_TYPE (CallsSipMediaPipeline, calls_sip_media_pipeline, G_TYPE_OBJECT)
#endif
static void
set_state (CallsSipMediaPipeline *self,
CallsMediaPipelineState state)
{
g_autoptr (GEnumClass) enum_class = NULL;
GEnumValue *enum_val;
g_autofree char *fname = NULL;
g_assert (CALLS_SIP_MEDIA_PIPELINE (self));
if (self->state == state)
return;
self->state = state;
g_object_notify_by_pspec (G_OBJECT (self), props[PROP_STATE]);
self->emitted_sending_signal = FALSE;
if (state == CALLS_MEDIA_PIPELINE_STATE_INITIALIZING)
return;
enum_class = g_type_class_ref (CALLS_TYPE_MEDIA_PIPELINE_STATE);
enum_val = g_enum_get_value (enum_class, state);
fname = g_strdup_printf ("calls-%s", enum_val->value_nick);
GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS (GST_BIN (self->pipeline),
GST_DEBUG_GRAPH_SHOW_ALL,
fname);
}
static void
check_element_maps (CallsSipMediaPipeline *self)
{
g_assert (CALLS_IS_SIP_MEDIA_PIPELINE (self));
/* TODO take encryption into account */
if (self->element_map_playing == EL_ALL_RTP) {
g_debug ("All pipeline elements are playing");
set_state (self, CALLS_MEDIA_PIPELINE_STATE_PLAYING);
return;
}
if (self->element_map_paused == EL_ALL_RTP) {
g_debug ("All pipeline elements are paused");
set_state (self, CALLS_MEDIA_PIPELINE_STATE_PAUSED);
return;
}
if (self->element_map_stopped == EL_ALL_RTP) {
g_debug ("All pipeline elements are stopped");
set_state (self, CALLS_MEDIA_PIPELINE_STATE_STOPPED);
return;
}
if ((self->element_map_playing & (EL_SENDING)) == (EL_SENDING) &&
!self->emitted_sending_signal) {
g_debug ("Sender pipeline is sending data to %s RTP/RTCP %d/%d",
self->remote, self->rport_rtp, self->rport_rtcp);
g_signal_emit (self, signals[SENDING_STARTED], 0);
self->emitted_sending_signal = TRUE;
}
}
/* rtpbin adds a pad once the payload is verified */
static void
on_pad_added (GstElement *rtpbin,
GstPad *srcpad,
GstElement *depayloader)
{
GstPad *sinkpad;
g_debug ("pad added: %s", GST_PAD_NAME (srcpad));
sinkpad = gst_element_get_static_pad (depayloader, "sink");
g_debug ("linking to %s", GST_PAD_NAME (sinkpad));
if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK)
g_warning ("Failed to link rtpbin to depayloader");
gst_object_unref (sinkpad);
}
static gboolean
on_bus_message (GstBus *bus,
GstMessage *message,
gpointer data)
{
CallsSipMediaPipeline *self = CALLS_SIP_MEDIA_PIPELINE (data);
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:
{
g_autoptr (GError) error = NULL;
g_autofree char *msg = NULL;
gst_message_parse_error (message, &error, &msg);
g_warning ("Error on the message bus: %s (%s)", error->message, msg);
break;
}
case GST_MESSAGE_WARNING:
{
g_autoptr (GError) error = NULL;
g_autofree char *msg = NULL;
gst_message_parse_warning (message, &error, &msg);
g_warning ("Warning on the message bus: %s (%s)", error->message, msg);
break;
}
case GST_MESSAGE_EOS:
g_debug ("Received end of stream");
calls_sip_media_pipeline_stop (self);
break;
case GST_MESSAGE_STATE_CHANGED:
{
GstState oldstate;
GstState newstate;
uint element_id = 0;
uint unset_element_id;
gst_message_parse_state_changed (message, &oldstate, &newstate, NULL);
g_debug ("Element %s has changed state from %s to %s",
GST_OBJECT_NAME (message->src),
gst_element_state_get_name (oldstate),
gst_element_state_get_name (newstate));
if (message->src == GST_OBJECT (self->pipeline))
element_id = EL_PIPELINE;
else if (message->src == GST_OBJECT (self->rtpbin))
element_id = EL_RTPBIN;
else if (message->src == GST_OBJECT (self->rtp_src))
element_id = EL_RTP_SRC;
else if (message->src == GST_OBJECT (self->rtp_sink))
element_id = EL_RTP_SINK;
else if (message->src == GST_OBJECT (self->rtcp_src))
element_id = EL_RTCP_SRC;
else if (message->src == GST_OBJECT (self->rtcp_sink))
element_id = EL_RTCP_SINK;
/* TODO srtp encryption
else if (message->src == GST_OBJECT (self->srtpenc))
element_id = EL_SRTP_ENCODER;
else if (message->src == GST_OBJECT (self->srtpdec))
element_id = EL_SRTP_DECODER;
*/
else if (message->src == GST_OBJECT (self->audio_src))
element_id = EL_AUDIO_SRC;
else if (message->src == GST_OBJECT (self->audio_sink))
element_id = EL_AUDIO_SINK;
else if (message->src == GST_OBJECT (self->payloader))
element_id = EL_PAYLOADER;
else if (message->src == GST_OBJECT (self->depayloader))
element_id = EL_DEPAYLOADER;
else if (message->src == GST_OBJECT (self->encoder))
element_id = EL_ENCODER;
else if (message->src == GST_OBJECT (self->decoder))
element_id = EL_DECODER;
unset_element_id = G_MAXUINT ^ element_id;
if (newstate == GST_STATE_PLAYING) {
self->element_map_playing |= element_id;
self->element_map_paused &= unset_element_id;
self->element_map_stopped &= unset_element_id;
} else if (newstate == GST_STATE_PAUSED) {
self->element_map_paused |= element_id;
self->element_map_playing &= unset_element_id;
self->element_map_stopped &= unset_element_id;
} else if (newstate == GST_STATE_NULL) {
self->element_map_stopped |= element_id;
self->element_map_playing &= unset_element_id;
self->element_map_paused &= unset_element_id;
}
check_element_maps (self);
break;
}
default:
if (self->debug)
g_debug ("Got unhandled %s message", GST_MESSAGE_TYPE_NAME (message));
break;
}
/* keep watching for messages on the bus */
return TRUE;
}
/* Pipeline setup */
static gboolean
setup_socket_reuse (CallsSipMediaPipeline *self,
GError **error)
{
g_autoptr (GSocket) rtp_sock = NULL;
g_autoptr (GSocket) rtcp_sock = NULL;
/* Set udp sources to ready to get ports allocated */
gst_element_set_state (self->pipeline, GST_STATE_READY);
g_object_get (self->rtp_src, "used-socket", &rtp_sock, NULL);
if (!rtp_sock) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Could not retrieve used socket from RTP udpsrc element");
return FALSE;
}
g_object_get (self->rtcp_src, "used-socket", &rtcp_sock, NULL);
if (!rtcp_sock) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Could not retrieve used socket from RTCP udpsrc element");
return FALSE;
}
/* Ports are allocated. Let's reuse the socket for rtcp source in the sink for NAT traversal*/
g_object_set (self->rtp_sink,
"socket", rtp_sock,
"close-socket", FALSE,
NULL);
g_object_set (self->rtcp_sink,
"socket", rtcp_sock,
"close-socket", FALSE,
NULL);
return TRUE;
}
static gboolean
pipeline_init (CallsSipMediaPipeline *self,
GError **error)
{
g_autoptr (GSocket) rtp_sock = NULL;
g_autoptr (GSocket) rtcp_sock = NULL;
const char *env_var;
g_assert (CALLS_SIP_MEDIA_PIPELINE (self));
self->pipeline = gst_pipeline_new ("media-pipeline");
if (!self->pipeline) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Could not create media pipeline");
return FALSE;
}
gst_object_ref_sink (self->pipeline);
/* Audio source*/
env_var = g_getenv ("CALLS_AUDIOSRC");
if (!STR_IS_NULL_OR_EMPTY (env_var)) {
MAKE_ELEMENT (audio_src, env_var, "audiosource");
} else {
g_autoptr (GstStructure) gst_props = NULL;
MAKE_ELEMENT (audio_src, "pulsesrc", "audiosource");
/* enable echo cancellation and set buffer size to 40ms */
gst_props = gst_structure_new ("props",
"media.role", G_TYPE_STRING, "phone",
"filter.want", G_TYPE_STRING, "echo-cancel",
NULL);
g_object_set (self->audio_src,
"buffer-time", (gint64) 40000,
"stream-properties", gst_props,
NULL);
}
/* Audio sink */
env_var = g_getenv ("CALLS_AUDIOSINK");
if (!STR_IS_NULL_OR_EMPTY (env_var)) {
MAKE_ELEMENT (audio_sink, env_var, "audiosink");
} else {
g_autoptr (GstStructure) gst_props = NULL;
MAKE_ELEMENT (audio_sink, "pulsesink", "audiosink");
/* enable echo cancellation and set buffer size to 40ms */
gst_props = gst_structure_new ("props",
"media.role", G_TYPE_STRING, "phone",
"filter.want", G_TYPE_STRING, "echo-cancel",
NULL);
g_object_set (self->audio_sink,
"buffer-time", (gint64) 40000,
"stream-properties", gst_props,
NULL);
}
/* rtpbin */
MAKE_ELEMENT (rtpbin, "rtpbin", "rtpbin");
/* UDP sources and sinks for RTP and RTCP */
MAKE_ELEMENT (rtp_src, "udpsrc", "rtp-udp-src");
MAKE_ELEMENT (rtp_sink, "udpsink", "rtp-udp-sink");
MAKE_ELEMENT (rtcp_src, "udpsrc", "rtcp-udp-src");
MAKE_ELEMENT (rtcp_sink, "udpsink", "rtcp-udp-sink");
/* port 0 means letting the OS allocate */
g_object_set (self->rtp_src,
"port", 0,
"close-socket", FALSE,
"reuse", TRUE,
NULL);
g_object_set (self->rtcp_src,
"port", 0,
"close-socket", FALSE,
"reuse", TRUE,
NULL);
g_object_set (self->rtp_sink, "async", FALSE, "sync", FALSE, NULL);
g_object_set (self->rtcp_sink, "async", FALSE, "sync", FALSE, NULL);
g_object_bind_property (self, "rport-rtp",
self->rtp_sink, "port",
G_BINDING_BIDIRECTIONAL);
g_object_bind_property (self, "remote",
self->rtp_sink, "host",
G_BINDING_BIDIRECTIONAL);
g_object_bind_property (self, "rport-rtcp",
self->rtcp_sink, "port",
G_BINDING_BIDIRECTIONAL);
g_object_bind_property (self, "remote",
self->rtcp_sink, "host",
G_BINDING_BIDIRECTIONAL);
/* Add all elements to the pipeline */
gst_bin_add_many (GST_BIN (self->pipeline),
self->audio_src, self->audio_sink,
self->rtpbin,
self->rtp_src, self->rtp_sink,
self->rtcp_src, self->rtcp_sink,
NULL);
/* Setup bus watch */
self->bus = gst_pipeline_get_bus (GST_PIPELINE (self->pipeline));
self->bus_watch_id = gst_bus_add_watch (self->bus, on_bus_message, self);
if (!setup_socket_reuse (self, error))
return FALSE;
return TRUE;
}
static gboolean
pipeline_link_elements (CallsSipMediaPipeline *self,
GError **error)
{
g_autoptr (GstPad) srcpad = NULL;
g_autoptr (GstPad) sinkpad = NULL;
g_assert (CALLS_IS_SIP_MEDIA_PIPELINE (self));
/* link to payloader */
#if GST_CHECK_VERSION (1, 20, 0)
sinkpad = gst_element_request_pad_simple (self->rtpbin, "send_rtp_sink_0");
#else
sinkpad = gst_element_get_request_pad (self->rtpbin, "send_rtp_sink_0");
#endif
srcpad = gst_element_get_static_pad (self->payloader, "src");
if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to link payloader to rtpbin");
return FALSE;
}
/* Transmitter pads */
srcpad = gst_element_get_static_pad (self->rtp_src, "src");
#if GST_CHECK_VERSION (1, 20, 0)
sinkpad = gst_element_request_pad_simple (self->rtpbin, "recv_rtp_sink_0");
#else
sinkpad = gst_element_get_request_pad (self->rtpbin, "recv_rtp_sink_0");
#endif
if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to link rtpsrc to rtpbin");
return FALSE;
}
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
srcpad = gst_element_get_static_pad (self->rtpbin, "send_rtp_src_0");
sinkpad = gst_element_get_static_pad (self->rtp_sink, "sink");
if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to link rtpbin to rtpsink");
return FALSE;
}
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
srcpad = gst_element_get_static_pad (self->rtcp_src, "src");
#if GST_CHECK_VERSION (1, 20 , 0)
sinkpad = gst_element_request_pad_simple (self->rtpbin, "recv_rtcp_sink_0");
#else
sinkpad = gst_element_get_request_pad (self->rtpbin, "recv_rtcp_sink_0");
#endif
if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to link rtcpsrc to rtpbin");
return FALSE;
}
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
#if GST_CHECK_VERSION (1, 20, 0)
srcpad = gst_element_request_pad_simple (self->rtpbin, "send_rtcp_src_0");
#else
srcpad = gst_element_get_request_pad (self->rtpbin, "send_rtcp_src_0");
#endif
sinkpad = gst_element_get_static_pad (self->rtcp_sink, "sink");
if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to link rtpbin to rtcpsink");
return FALSE;
}
/* can only link to depayloader after RTP payload has been verified */
g_signal_connect (self->rtpbin, "pad-added", G_CALLBACK (on_pad_added), self->depayloader);
return TRUE;
}
static gboolean
pipeline_setup_codecs (CallsSipMediaPipeline *self,
MediaCodecInfo *codec,
GError **error)
{
g_autoptr (GstCaps) caps = NULL;
g_autofree char *caps_string = NULL;
g_assert (CALLS_IS_SIP_MEDIA_PIPELINE (self));
g_assert (codec);
MAKE_ELEMENT (decoder, codec->gst_decoder_name, "decoder");
MAKE_ELEMENT (depayloader, codec->gst_depayloader_name, "depayloader");
MAKE_ELEMENT (encoder, codec->gst_encoder_name, "encoder");
MAKE_ELEMENT (payloader, codec->gst_payloader_name, "payloader");
gst_bin_add_many (GST_BIN (self->pipeline),
self->depayloader, self->decoder,
self->payloader, self->encoder,
NULL);
if (!gst_element_link_many (self->audio_src, self->encoder, self->payloader, NULL)) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to link audiosrc encoder and payloader");
return FALSE;
}
if (!gst_element_link_many (self->depayloader, self->decoder, self->audio_sink, NULL)) {
if (error)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Failed to link depayloader decoder and audiosink");
return FALSE;
}
/* UDP src capabilities */
caps_string = media_codec_get_gst_capabilities (codec);
g_debug ("Capabilities:\n%s", caps_string);
caps = gst_caps_from_string (caps_string);
/* set udp sinks and sources for RTP and RTCP */
g_object_set (self->rtp_src,
"caps", caps,
NULL);
return TRUE;
}
static void
calls_sip_media_pipeline_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
CallsSipMediaPipeline *self = CALLS_SIP_MEDIA_PIPELINE (object);
switch (property_id) {
case PROP_CODEC:
g_value_set_pointer (value, self->codec);
break;
case PROP_REMOTE:
g_value_set_string (value, self->remote);
break;
case PROP_RPORT_RTP:
g_value_set_uint (value, self->rport_rtp);
break;
case PROP_RPORT_RTCP:
g_value_set_uint (value, self->rport_rtcp);
break;
case PROP_DEBUG:
g_value_set_boolean (value, self->debug);
break;
case PROP_STATE:
g_value_set_enum (value, calls_sip_media_pipeline_get_state (self));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
calls_sip_media_pipeline_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
CallsSipMediaPipeline *self = CALLS_SIP_MEDIA_PIPELINE (object);
switch (property_id) {
case PROP_CODEC:
calls_sip_media_pipeline_set_codec (self, g_value_get_pointer (value));
break;
case PROP_REMOTE:
g_free (self->remote);
self->remote = g_value_dup_string (value);
break;
case PROP_RPORT_RTP:
self->rport_rtp = g_value_get_uint (value);
break;
case PROP_RPORT_RTCP:
self->rport_rtcp = g_value_get_uint (value);
break;
case PROP_DEBUG:
self->debug = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
calls_sip_media_pipeline_constructed (GObject *object)
{
g_autoptr (GError) error = NULL;
CallsSipMediaPipeline *self = CALLS_SIP_MEDIA_PIPELINE (object);
G_OBJECT_CLASS (calls_sip_media_pipeline_parent_class)->constructed (object);
set_state (self, CALLS_MEDIA_PIPELINE_STATE_INITIALIZING);
if (!pipeline_init (self, &error)) {
g_warning ("Could not create pipeline: %s", error->message);
set_state (self, CALLS_MEDIA_PIPELINE_STATE_ERROR);
return;
}
set_state (self, CALLS_MEDIA_PIPELINE_STATE_NEED_CODEC);
}
static void
calls_sip_media_pipeline_finalize (GObject *object)
{
CallsSipMediaPipeline *self = CALLS_SIP_MEDIA_PIPELINE (object);
calls_sip_media_pipeline_stop (self);
gst_object_unref (self->pipeline);
gst_bus_remove_watch (self->bus);
gst_object_unref (self->bus);
g_free (self->remote);
G_OBJECT_CLASS (calls_sip_media_pipeline_parent_class)->finalize (object);
}
static void
calls_sip_media_pipeline_class_init (CallsSipMediaPipelineClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->set_property = calls_sip_media_pipeline_set_property;
object_class->constructed = calls_sip_media_pipeline_constructed;
object_class->get_property = calls_sip_media_pipeline_get_property;
object_class->finalize = calls_sip_media_pipeline_finalize;
/* Maybe we want to turn Codec into a GObject later */
props[PROP_CODEC] = g_param_spec_pointer ("codec",
"Codec",
"Media codec",
G_PARAM_READWRITE);
props[PROP_REMOTE] = g_param_spec_string ("remote",
"Remote",
"Remote host",
NULL,
G_PARAM_READWRITE);
props[PROP_RPORT_RTP] = g_param_spec_uint ("rport-rtp",
"rport-rtp",
"remote rtp port",
1025, 65535, 5002,
G_PARAM_READWRITE);
props[PROP_RPORT_RTCP] = g_param_spec_uint ("rport-rtcp",
"rport-rtcp",
"remote rtcp port",
1025, 65535, 5003,
G_PARAM_READWRITE);
props[PROP_DEBUG] = g_param_spec_boolean ("debug",
"Debug",
"Enable debugging information",
FALSE,
G_PARAM_READWRITE);
props[PROP_STATE] = g_param_spec_enum ("state",
"State",
"The state of the media pipeline",
CALLS_TYPE_MEDIA_PIPELINE_STATE,
CALLS_MEDIA_PIPELINE_STATE_UNKNOWN,
G_PARAM_READABLE);
g_object_class_install_properties (object_class, PROP_LAST_PROP, props);
signals[SENDING_STARTED] =
g_signal_new ("sending-started",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0, NULL, NULL, NULL,
G_TYPE_NONE, 0);
}
static void
calls_sip_media_pipeline_init (CallsSipMediaPipeline *self)
{
if (!gst_is_initialized ())
gst_init (NULL, NULL);
}
CallsSipMediaPipeline*
calls_sip_media_pipeline_new (MediaCodecInfo *codec)
{
CallsSipMediaPipeline *pipeline;
pipeline = g_object_new (CALLS_TYPE_SIP_MEDIA_PIPELINE, NULL);
if (codec)
g_object_set (pipeline, "codec", codec, NULL);
return pipeline;
}
void
calls_sip_media_pipeline_set_codec (CallsSipMediaPipeline *self,
MediaCodecInfo *codec)
{
g_autoptr (GError) error = NULL;
g_return_if_fail (CALLS_IS_SIP_MEDIA_PIPELINE (self));
g_return_if_fail (codec);
if (self->codec == codec)
return;
if (self->codec) {
g_warning ("Cannot change codec of a pipeline. Use a new pipeline instead.");
return;
}
if (!media_codec_available_in_gst (codec)) {
g_warning ("Cannot setup pipeline with codec '%s' because it's not available in GStreamer",
codec->name);
return;
}
if (!pipeline_setup_codecs (self, codec, &error)) {
g_warning ("Error trying to setup codecs for pipeline: %s",
error->message);
set_state (self, CALLS_MEDIA_PIPELINE_STATE_ERROR);
return;
}
if (!pipeline_link_elements (self, &error)) {
g_warning ("Not all pads could be linked: %s",
error->message);
set_state (self, CALLS_MEDIA_PIPELINE_STATE_ERROR);
return;
}
self->codec = codec;
g_object_notify_by_pspec (G_OBJECT (self), props[PROP_CODEC]);
set_state (self, CALLS_MEDIA_PIPELINE_STATE_READY);
}
static void
diagnose_used_ports_in_socket (GSocket *socket)
{
g_autoptr (GSocketAddress) local_addr = NULL;
g_autoptr (GSocketAddress) remote_addr = NULL;
guint16 local_port;
guint16 remote_port;
local_addr = g_socket_get_local_address (socket, NULL);
remote_addr = g_socket_get_remote_address (socket, NULL);
if (!local_addr) {
g_warning ("Could not get local address of socket");
return;
}
g_assert (G_IS_INET_SOCKET_ADDRESS (local_addr));
local_port = g_inet_socket_address_get_port (G_INET_SOCKET_ADDRESS (local_addr));
g_debug ("Using local port %d", local_port);
if (!remote_addr) {
g_warning ("Could not get remote address of socket");
return;
}
g_assert (G_IS_INET_SOCKET_ADDRESS (remote_addr));
remote_port = g_inet_socket_address_get_port (G_INET_SOCKET_ADDRESS (remote_addr));
g_debug ("Using remote port %d", remote_port);
}
static void
diagnose_ports_in_use (CallsSipMediaPipeline *self)
{
GSocket *socket_in;
GSocket *socket_out;
gboolean same_socket = FALSE;
g_assert (CALLS_IS_SIP_MEDIA_PIPELINE (self));
if (self->state != CALLS_MEDIA_PIPELINE_STATE_PLAYING &&
self->state != CALLS_MEDIA_PIPELINE_STATE_PAUSED) {
g_warning ("Cannot diagnose ports when pipeline is not active");
return;
}
g_object_get (self->rtp_src, "used-socket", &socket_in, NULL);
g_object_get (self->rtp_sink, "used-socket", &socket_out, NULL);
if (socket_in == NULL || socket_out == NULL) {
g_warning ("Could not get used socket");
return;
}
same_socket = socket_in == socket_out;
if (same_socket) {
g_debug ("Diagnosing bidirectional socket...");
diagnose_used_ports_in_socket (socket_in);
}
else {
g_debug ("Diagnosing server socket...");
diagnose_used_ports_in_socket (socket_in);
g_debug ("Diagnosing client socket...");
diagnose_used_ports_in_socket (socket_out);
}
}
void
calls_sip_media_pipeline_start (CallsSipMediaPipeline *self)
{
g_return_if_fail (CALLS_IS_SIP_MEDIA_PIPELINE (self));
if (self->state != CALLS_MEDIA_PIPELINE_STATE_READY) {
g_warning ("Cannot start pipeline because it's not ready");
return;
}
g_debug ("Starting media pipeline");
g_debug ("RTP/RTCP port before starting pipeline: %d/%d",
calls_sip_media_pipeline_get_rtp_port (self),
calls_sip_media_pipeline_get_rtcp_port (self));
gst_element_set_state (self->pipeline, GST_STATE_PLAYING);
g_debug ("RTP/RTCP port after starting pipeline: %d/%d",
calls_sip_media_pipeline_get_rtp_port (self),
calls_sip_media_pipeline_get_rtcp_port (self));
set_state (self, CALLS_MEDIA_PIPELINE_STATE_PLAY_PENDING);
if (self->debug)
diagnose_ports_in_use (self);
}
void
calls_sip_media_pipeline_stop (CallsSipMediaPipeline *self)
{
g_return_if_fail (CALLS_IS_SIP_MEDIA_PIPELINE (self));
g_debug ("Stopping media pipeline");
gst_element_set_state (self->pipeline, GST_STATE_NULL);
set_state (self, CALLS_MEDIA_PIPELINE_STATE_STOP_PENDING);
}
void
calls_sip_media_pipeline_pause (CallsSipMediaPipeline *self,
gboolean pause)
{
g_return_if_fail (CALLS_IS_SIP_MEDIA_PIPELINE (self));
if (pause &&
(self->state == CALLS_MEDIA_PIPELINE_STATE_PAUSED ||
self->state == CALLS_MEDIA_PIPELINE_STATE_PAUSE_PENDING))
return;
if (!pause &&
(self->state == CALLS_MEDIA_PIPELINE_STATE_PLAYING ||
self->state == CALLS_MEDIA_PIPELINE_STATE_PLAY_PENDING))
return;
if (self->state != CALLS_MEDIA_PIPELINE_STATE_PLAYING &&
self->state != CALLS_MEDIA_PIPELINE_STATE_PLAY_PENDING &&
self->state != CALLS_MEDIA_PIPELINE_STATE_PAUSED &&
self->state != CALLS_MEDIA_PIPELINE_STATE_PAUSE_PENDING) {
g_warning ("Cannot pause or unpause pipeline because it's not currently active");
return;
}
g_debug ("%s media pipeline", pause ?
"Pausing" :
"Unpausing");
gst_element_set_state (self->pipeline, pause ?
GST_STATE_PAUSED :
GST_STATE_PLAYING);
set_state (self, pause ?
CALLS_MEDIA_PIPELINE_STATE_PAUSE_PENDING :
CALLS_MEDIA_PIPELINE_STATE_PLAY_PENDING);
}
int
calls_sip_media_pipeline_get_rtp_port (CallsSipMediaPipeline *self)
{
int port;
g_return_val_if_fail (CALLS_IS_SIP_MEDIA_PIPELINE (self), 0);
g_object_get (self->rtp_src, "port", &port, NULL);
return port;
}
int
calls_sip_media_pipeline_get_rtcp_port (CallsSipMediaPipeline *self)
{
int port;
g_return_val_if_fail (CALLS_IS_SIP_MEDIA_PIPELINE (self), 0);
g_object_get (self->rtcp_src, "port", &port, NULL);
return port;
}
CallsMediaPipelineState
calls_sip_media_pipeline_get_state (CallsSipMediaPipeline *self)
{
g_return_val_if_fail (CALLS_IS_SIP_MEDIA_PIPELINE (self),
CALLS_MEDIA_PIPELINE_STATE_UNKNOWN);
return self->state;
}
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