gstreamer/gst/rtp/rtpstorage.c

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/* GStreamer plugin for forward error correction
* Copyright (C) 2017 Pexip
*
* 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
*
* Author: Mikhail Fludkov <misha@pexip.com>
*/
#include <gst/rtp/gstrtpbuffer.h>
#include "rtpstorage.h"
#include "rtpstoragestream.h"
#define GST_CAT_DEFAULT (gst_rtp_storage_debug)
enum
{
SIGNAL_PACKET_RECOVERED,
LAST_SIGNAL,
};
static guint rtp_storage_signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE (RtpStorage, rtp_storage, G_TYPE_OBJECT);
#define STORAGE_LOCK(s) g_mutex_lock (&(s)->streams_lock)
#define STORAGE_UNLOCK(s) g_mutex_unlock (&(s)->streams_lock)
#define DEFAULT_SIZE_TIME (0)
static void
rtp_storage_init (RtpStorage * self)
{
self->size_time = DEFAULT_SIZE_TIME;
self->streams = g_hash_table_new_full (NULL, NULL, NULL,
(GDestroyNotify) rtp_storage_stream_free);
g_mutex_init (&self->streams_lock);
}
static void
rtp_storage_dispose (GObject * obj)
{
RtpStorage *self = RTP_STORAGE (obj);
STORAGE_LOCK (self);
g_hash_table_unref (self->streams);
self->streams = NULL;
STORAGE_UNLOCK (self);
g_mutex_clear (&self->streams_lock);
G_OBJECT_CLASS (rtp_storage_parent_class)->dispose (obj);
}
static void
rtp_storage_class_init (RtpStorageClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
rtp_storage_signals[SIGNAL_PACKET_RECOVERED] =
g_signal_new ("packet-recovered", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL,
g_cclosure_marshal_generic, G_TYPE_NONE, 1, GST_TYPE_BUFFER);
gobject_class->dispose = rtp_storage_dispose;
}
GstBufferList *
rtp_storage_get_packets_for_recovery (RtpStorage * self, gint fec_pt,
guint32 ssrc, guint16 lost_seq)
{
GstBufferList *ret = NULL;
RtpStorageStream *stream;
if (0 == self->size_time) {
GST_WARNING_OBJECT (self, "Received request for recovery RTP packets"
" around lost_seqnum=%u fec_pt=%u for ssrc=%08x, but size is 0",
lost_seq, fec_pt, ssrc);
return NULL;
}
STORAGE_LOCK (self);
stream = g_hash_table_lookup (self->streams, GUINT_TO_POINTER (ssrc));
STORAGE_UNLOCK (self);
if (NULL == stream) {
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GST_ERROR_OBJECT (self, "Cant find ssrc = 0x08%x", ssrc);
} else {
STREAM_LOCK (stream);
if (stream->queue.length > 0) {
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GST_LOG_OBJECT (self, "Looking for recovery packets for fec_pt=%u around"
" lost_seq=%u for ssrc=%08x", fec_pt, lost_seq, ssrc);
ret =
rtp_storage_stream_get_packets_for_recovery (stream, fec_pt,
lost_seq);
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} else {
GST_DEBUG_OBJECT (self, "Empty RTP storage for ssrc=%08x", ssrc);
}
STREAM_UNLOCK (stream);
}
return ret;
}
GstBuffer *
rtp_storage_get_redundant_packet (RtpStorage * self, guint32 ssrc,
guint16 lost_seq)
{
GstBuffer *ret = NULL;
RtpStorageStream *stream;
if (0 == self->size_time) {
GST_WARNING_OBJECT (self, "Received request for redundant RTP packet with"
" seq=%u for ssrc=%08x, but size is 0", lost_seq, ssrc);
return NULL;
}
STORAGE_LOCK (self);
stream = g_hash_table_lookup (self->streams, GUINT_TO_POINTER (ssrc));
STORAGE_UNLOCK (self);
if (NULL == stream) {
GST_ERROR_OBJECT (self, "Cant find ssrc = 0x%x", ssrc);
} else {
STREAM_LOCK (stream);
if (stream->queue.length > 0) {
ret = rtp_storage_stream_get_redundant_packet (stream, lost_seq);
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} else {
GST_DEBUG_OBJECT (self, "Empty RTP storage for ssrc=%08x", ssrc);
}
STREAM_UNLOCK (stream);
}
return ret;
}
static void
rtp_storage_do_put_recovered_packet (RtpStorage * self,
GstBuffer * buffer, guint8 pt, guint32 ssrc, guint16 seq)
{
RtpStorageStream *stream;
STORAGE_LOCK (self);
stream = g_hash_table_lookup (self->streams, GUINT_TO_POINTER (ssrc));
STORAGE_UNLOCK (self);
g_assert (stream);
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GST_LOG_OBJECT (self,
"Storing recovered RTP packet with ssrc=%08x pt=%u seq=%u %"
GST_PTR_FORMAT, ssrc, pt, seq, buffer);
STREAM_LOCK (stream);
rtp_storage_stream_add_item (stream, buffer, pt, seq);
STREAM_UNLOCK (stream);
}
void
rtp_storage_put_recovered_packet (RtpStorage * self,
GstBuffer * buffer, guint8 pt, guint32 ssrc, guint16 seq)
{
rtp_storage_do_put_recovered_packet (self, buffer, pt, ssrc, seq);
g_signal_emit (self, rtp_storage_signals[SIGNAL_PACKET_RECOVERED], 0, buffer);
}
gboolean
rtp_storage_append_buffer (RtpStorage * self, GstBuffer * buf)
{
GstRTPBuffer rtpbuf = GST_RTP_BUFFER_INIT;
RtpStorageStream *stream;
guint32 ssrc;
guint8 pt;
guint16 seq;
if (0 == self->size_time)
return TRUE;
/* We are about to save it in the queue, it so it is better take a ref before
* mapping the buffer */
gst_buffer_ref (buf);
if (!gst_rtp_buffer_map (buf, GST_MAP_READ |
GST_RTP_BUFFER_MAP_FLAG_SKIP_PADDING, &rtpbuf)) {
gst_buffer_unref (buf);
return TRUE;
}
ssrc = gst_rtp_buffer_get_ssrc (&rtpbuf);
pt = gst_rtp_buffer_get_payload_type (&rtpbuf);
seq = gst_rtp_buffer_get_seq (&rtpbuf);
STORAGE_LOCK (self);
stream = g_hash_table_lookup (self->streams, GUINT_TO_POINTER (ssrc));
if (NULL == stream) {
GST_DEBUG_OBJECT (self,
"New media stream (ssrc=0x%08x, pt=%u) detected", ssrc, pt);
stream = rtp_storage_stream_new (ssrc);
g_hash_table_insert (self->streams, GUINT_TO_POINTER (ssrc), stream);
}
STORAGE_UNLOCK (self);
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GST_LOG_OBJECT (self,
"Storing RTP packet with ssrc=%08x pt=%u seq=%u %" GST_PTR_FORMAT,
ssrc, pt, seq, buf);
STREAM_LOCK (stream);
/* Saving the buffer, now the storage owns it */
rtp_storage_stream_resize_and_add_item (stream, self->size_time, buf, pt,
seq);
STREAM_UNLOCK (stream);
gst_rtp_buffer_unmap (&rtpbuf);
if (GST_BUFFER_FLAG_IS_SET (buf, GST_RTP_BUFFER_FLAG_REDUNDANT)) {
gst_buffer_unref (buf);
return FALSE;
}
return TRUE;
}
void
rtp_storage_clear (RtpStorage * self)
{
STORAGE_LOCK (self);
g_hash_table_remove_all (self->streams);
STORAGE_UNLOCK (self);
}
void
rtp_storage_set_size (RtpStorage * self, GstClockTime size)
{
self->size_time = size;
if (0 == self->size_time)
rtp_storage_clear (self);
}
GstClockTime
rtp_storage_get_size (RtpStorage * self)
{
return self->size_time;
}
RtpStorage *
rtp_storage_new (void)
{
return g_object_new (RTP_TYPE_STORAGE, NULL);
}