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530 lines
17 KiB
C
530 lines
17 KiB
C
/* GStreamer plugin for forward error correction
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* Copyright (C) 2017 Pexip
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Author: Mikhail Fludkov <misha@pexip.com>
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*/
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/**
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* SECTION:element-rtpredenc
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* @short_description: RTP Redundant Audio Data (RED) encoder
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* @title: rtpredenc
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*
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* Encode Redundant Audio Data (RED) as per RFC 2198.
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*
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* This element is mostly provided for chrome webrtc compatibility:
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* chrome expects protection packets generated by #GstRtpUlpFecEnc
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* to be wrapped in RED packets for backward compatibility purposes,
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* but does not actually make use of the redundant packets that could
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* be encoded with this element.
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*
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* As such, when used for that purpose, only the #GstRtpRedEnc:pt property
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* should be set to a payload type different from both the protected and
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* protection packets' payload types.
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*
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* When using #GstRtpBin, this element should be inserted through the
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* #GstRtpBin::request-fec-encoder signal.
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*
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* ## Example pipeline
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*
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* |[
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* gst-launch-1.0 videotestsrc ! x264enc ! video/x-h264, profile=baseline ! rtph264pay pt=96 ! rtpulpfecenc percentage=100 pt=122 ! rtpredenc pt=122 distance=2 ! identity drop-probability=0.05 ! udpsink port=8888
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* ]| This example will send a stream with RED and ULP FEC.
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*
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* See also: #GstRtpRedDec, #GstWebRTCBin, #GstRtpBin
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* Since: 1.14
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*/
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#include <gst/rtp/gstrtpbuffer.h>
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#include <string.h>
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#include <stdio.h>
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#include "rtpredcommon.h"
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#include "gstrtpredenc.h"
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typedef struct
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{
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guint8 pt;
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guint32 timestamp;
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GstBuffer *payload;
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} RTPHistItem;
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp"));
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp"));
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#define DEFAULT_PT (0)
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#define DEFAULT_DISTANCE (0)
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#define DEFAULT_ALLOW_NO_RED_BLOCKS (TRUE)
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GST_DEBUG_CATEGORY_STATIC (gst_rtp_red_enc_debug);
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#define GST_CAT_DEFAULT (gst_rtp_red_enc_debug)
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G_DEFINE_TYPE (GstRtpRedEnc, gst_rtp_red_enc, GST_TYPE_ELEMENT);
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enum
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{
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PROP_0,
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PROP_PT,
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PROP_SENT,
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PROP_DISTANCE,
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PROP_ALLOW_NO_RED_BLOCKS
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};
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static void
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rtp_hist_item_init (RTPHistItem * item, GstRTPBuffer * rtp,
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GstBuffer * rtp_payload)
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{
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item->pt = gst_rtp_buffer_get_payload_type (rtp);
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item->timestamp = gst_rtp_buffer_get_timestamp (rtp);
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item->payload = rtp_payload;
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}
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static RTPHistItem *
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rtp_hist_item_new (GstRTPBuffer * rtp, GstBuffer * rtp_payload)
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{
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RTPHistItem *item = g_slice_new0 (RTPHistItem);
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rtp_hist_item_init (item, rtp, rtp_payload);
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return item;
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}
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static void
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rtp_hist_item_replace (RTPHistItem * item, GstRTPBuffer * rtp,
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GstBuffer * rtp_payload)
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{
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gst_buffer_unref (item->payload);
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rtp_hist_item_init (item, rtp, rtp_payload);
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}
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static void
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rtp_hist_item_free (gpointer _item)
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{
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RTPHistItem *item = _item;
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gst_buffer_unref (item->payload);
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g_slice_free (RTPHistItem, item);
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}
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static GstEvent *
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_create_caps_event (const GstCaps * caps, guint8 pt)
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{
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GstEvent *ret;
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GstCaps *new = gst_caps_copy (caps);
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GstStructure *s = gst_caps_get_structure (new, 0);
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gst_structure_set (s, "payload", G_TYPE_INT, pt, NULL);
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GST_INFO ("sinkcaps %" GST_PTR_FORMAT ", srccaps %" GST_PTR_FORMAT,
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caps, new);
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ret = gst_event_new_caps (new);
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gst_caps_unref (new);
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return ret;
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}
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static GstBuffer *
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_alloc_red_packet_and_fill_headers (GstRtpRedEnc * self,
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RTPHistItem * redundant_block, GstRTPBuffer * inp_rtp)
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{
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guint red_header_size = rtp_red_block_header_get_length (FALSE) +
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(redundant_block ? rtp_red_block_header_get_length (TRUE) : 0);
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guint32 timestamp = gst_rtp_buffer_get_timestamp (inp_rtp);
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guint csrc_count = gst_rtp_buffer_get_csrc_count (inp_rtp);
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GstBuffer *red = gst_rtp_buffer_new_allocate (red_header_size, 0, csrc_count);
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guint8 *red_block_header;
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GstRTPBuffer red_rtp = GST_RTP_BUFFER_INIT;
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guint i;
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if (!gst_rtp_buffer_map (red, GST_MAP_WRITE, &red_rtp))
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g_assert_not_reached ();
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/* Copying RTP header of incoming packet */
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if (gst_rtp_buffer_get_extension (inp_rtp))
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GST_WARNING_OBJECT (self, "FIXME: Ignoring RTP extension");
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gst_rtp_buffer_set_marker (&red_rtp, gst_rtp_buffer_get_marker (inp_rtp));
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gst_rtp_buffer_set_payload_type (&red_rtp, self->pt);
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gst_rtp_buffer_set_seq (&red_rtp, gst_rtp_buffer_get_seq (inp_rtp));
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gst_rtp_buffer_set_timestamp (&red_rtp, timestamp);
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gst_rtp_buffer_set_ssrc (&red_rtp, gst_rtp_buffer_get_ssrc (inp_rtp));
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for (i = 0; i != csrc_count; ++i)
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gst_rtp_buffer_set_csrc (&red_rtp, i,
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gst_rtp_buffer_get_csrc ((inp_rtp), i));
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/* Filling RED block headers */
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red_block_header = gst_rtp_buffer_get_payload (&red_rtp);
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if (redundant_block) {
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rtp_red_block_set_is_redundant (red_block_header, TRUE);
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rtp_red_block_set_payload_type (red_block_header, redundant_block->pt);
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rtp_red_block_set_timestamp_offset (red_block_header,
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timestamp - redundant_block->timestamp);
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rtp_red_block_set_payload_length (red_block_header,
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gst_buffer_get_size (redundant_block->payload));
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red_block_header += rtp_red_block_header_get_length (TRUE);
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}
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rtp_red_block_set_is_redundant (red_block_header, FALSE);
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rtp_red_block_set_payload_type (red_block_header,
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gst_rtp_buffer_get_payload_type (inp_rtp));
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gst_rtp_buffer_unmap (&red_rtp);
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gst_buffer_copy_into (red, inp_rtp->buffer, GST_BUFFER_COPY_METADATA, 0, -1);
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return red;
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}
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static GstBuffer *
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_create_red_packet (GstRtpRedEnc * self,
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GstRTPBuffer * rtp, RTPHistItem * redundant_block, GstBuffer * main_block)
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{
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GstBuffer *red =
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_alloc_red_packet_and_fill_headers (self, redundant_block, rtp);
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if (redundant_block)
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red = gst_buffer_append (red, gst_buffer_ref (redundant_block->payload));
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red = gst_buffer_append (red, gst_buffer_ref (main_block));
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return red;
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}
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static RTPHistItem *
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_red_history_get_redundant_block (GstRtpRedEnc * self,
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guint32 current_timestamp, guint distance)
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{
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RTPHistItem *item;
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gint32 timestamp_offset;
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if (0 == distance || 0 == self->rtp_history->length)
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return NULL;
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item = self->rtp_history->tail->data;
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timestamp_offset = current_timestamp - item->timestamp;
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if (G_UNLIKELY (timestamp_offset > RED_BLOCK_TIMESTAMP_OFFSET_MAX)) {
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GST_WARNING_OBJECT (self,
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"Can't create redundant block with distance %u, "
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"timestamp offset is too large %d (%u - %u) > %u",
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distance, timestamp_offset, current_timestamp, item->timestamp,
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RED_BLOCK_TIMESTAMP_OFFSET_MAX);
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return NULL;
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}
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if (G_UNLIKELY (timestamp_offset < 0)) {
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GST_WARNING_OBJECT (self,
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"Can't create redundant block with distance %u, "
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"timestamp offset is negative %d (%u - %u)",
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distance, timestamp_offset, current_timestamp, item->timestamp);
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return NULL;
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}
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if (G_UNLIKELY (gst_buffer_get_size (item->payload) > RED_BLOCK_LENGTH_MAX)) {
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GST_WARNING_OBJECT (self,
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"Can't create redundant block with distance %u, "
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"red block is too large %u > %u",
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distance, (guint) gst_buffer_get_size (item->payload),
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RED_BLOCK_LENGTH_MAX);
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return NULL;
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}
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/* _red_history_trim should take care it never happens */
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g_assert_cmpint (self->rtp_history->length, <=, distance);
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if (G_UNLIKELY (self->rtp_history->length < distance))
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GST_DEBUG_OBJECT (self,
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"Don't have enough buffers yet, "
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"adding redundant block with distance %u and timestamp %u",
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self->rtp_history->length, item->timestamp);
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return item;
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}
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static void
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_red_history_prepend (GstRtpRedEnc * self,
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GstRTPBuffer * rtp, GstBuffer * rtp_payload, guint max_history_length)
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{
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GList *link;
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if (0 == max_history_length) {
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if (rtp_payload)
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gst_buffer_unref (rtp_payload);
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return;
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}
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g_assert (NULL != rtp_payload);
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if (self->rtp_history->length >= max_history_length) {
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link = g_queue_pop_tail_link (self->rtp_history);
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rtp_hist_item_replace (link->data, rtp, rtp_payload);
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} else {
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link = g_list_alloc ();
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link->data = rtp_hist_item_new (rtp, rtp_payload);
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}
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g_queue_push_head_link (self->rtp_history, link);
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}
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static void
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_red_history_trim (GstRtpRedEnc * self, guint max_history_length)
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{
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while (max_history_length < self->rtp_history->length)
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rtp_hist_item_free (g_queue_pop_tail (self->rtp_history));
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}
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static GstFlowReturn
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_pad_push (GstRtpRedEnc * self, GstBuffer * buffer, gboolean is_red)
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{
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if (self->send_caps || is_red != self->is_current_caps_red) {
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GstEvent *event;
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GstCaps *caps = gst_pad_get_current_caps (self->sinkpad);
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if (is_red)
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event = _create_caps_event (caps, self->pt);
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else
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event = gst_event_new_caps (caps);
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gst_caps_unref (caps);
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gst_pad_push_event (self->srcpad, event);
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self->send_caps = FALSE;
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self->is_current_caps_red = is_red;
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}
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return gst_pad_push (self->srcpad, buffer);
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}
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static GstFlowReturn
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_push_nonred_packet (GstRtpRedEnc * self,
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GstRTPBuffer * rtp, GstBuffer * buffer, guint distance)
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{
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GstBuffer *main_block = distance > 0 ?
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gst_rtp_buffer_get_payload_buffer (rtp) : NULL;
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_red_history_prepend (self, rtp, main_block, distance);
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gst_rtp_buffer_unmap (rtp);
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return _pad_push (self, buffer, FALSE);
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}
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static GstFlowReturn
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_push_red_packet (GstRtpRedEnc * self,
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GstRTPBuffer * rtp, GstBuffer * buffer, RTPHistItem * redundant_block,
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guint distance)
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{
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GstBuffer *main_block = gst_rtp_buffer_get_payload_buffer (rtp);
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GstBuffer *red_buffer =
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_create_red_packet (self, rtp, redundant_block, main_block);
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_red_history_prepend (self, rtp, main_block, distance);
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gst_rtp_buffer_unmap (rtp);
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gst_buffer_unref (buffer);
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self->num_sent++;
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return _pad_push (self, red_buffer, TRUE);
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}
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static GstFlowReturn
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gst_rtp_red_enc_chain (GstPad G_GNUC_UNUSED * pad, GstObject * parent,
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GstBuffer * buffer)
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{
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GstRtpRedEnc *self = GST_RTP_RED_ENC (parent);
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guint distance = self->distance;
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guint only_with_redundant_data = !self->allow_no_red_blocks;
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RTPHistItem *redundant_block;
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GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
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/* We need to "trim" the history if 'distance' property has changed */
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_red_history_trim (self, distance);
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if (0 == distance && only_with_redundant_data)
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return _pad_push (self, buffer, FALSE);
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if (!gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp))
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return _pad_push (self, buffer, self->is_current_caps_red);
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/* If can't get data for redundant block push the packet as is */
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redundant_block = _red_history_get_redundant_block (self,
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gst_rtp_buffer_get_timestamp (&rtp), distance);
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if (NULL == redundant_block && only_with_redundant_data)
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return _push_nonred_packet (self, &rtp, buffer, distance);
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/* About to create RED packet with or without redundant data */
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return _push_red_packet (self, &rtp, buffer, redundant_block, distance);
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}
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static gboolean
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gst_rtp_red_enc_event_sink (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstRtpRedEnc *self = GST_RTP_RED_ENC (parent);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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{
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gboolean replace_with_red_caps =
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self->is_current_caps_red || self->allow_no_red_blocks;
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if (replace_with_red_caps) {
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GstCaps *caps;
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gst_event_parse_caps (event, &caps);
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gst_event_take (&event, _create_caps_event (caps, self->pt));
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self->is_current_caps_red = TRUE;
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}
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break;
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}
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default:
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break;
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}
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return gst_pad_event_default (pad, parent, event);
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}
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static void
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gst_rtp_red_enc_dispose (GObject * obj)
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{
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GstRtpRedEnc *self = GST_RTP_RED_ENC (obj);
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g_queue_free_full (self->rtp_history, rtp_hist_item_free);
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G_OBJECT_CLASS (gst_rtp_red_enc_parent_class)->dispose (obj);
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}
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static void
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gst_rtp_red_enc_init (GstRtpRedEnc * self)
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{
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GstPadTemplate *pad_template;
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pad_template =
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gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (self), "src");
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self->srcpad = gst_pad_new_from_template (pad_template, "src");
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gst_element_add_pad (GST_ELEMENT_CAST (self), self->srcpad);
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pad_template =
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gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (self), "sink");
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self->sinkpad = gst_pad_new_from_template (pad_template, "sink");
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gst_pad_set_chain_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rtp_red_enc_chain));
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gst_pad_set_event_function (self->sinkpad,
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GST_DEBUG_FUNCPTR (gst_rtp_red_enc_event_sink));
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GST_PAD_SET_PROXY_CAPS (self->sinkpad);
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GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
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gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
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self->pt = DEFAULT_PT;
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self->distance = DEFAULT_DISTANCE;
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self->allow_no_red_blocks = DEFAULT_ALLOW_NO_RED_BLOCKS;
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self->num_sent = 0;
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self->rtp_history = g_queue_new ();
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}
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static void
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gst_rtp_red_enc_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRtpRedEnc *self = GST_RTP_RED_ENC (object);
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switch (prop_id) {
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case PROP_PT:
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{
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gint prev_pt = self->pt;
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self->pt = g_value_get_int (value);
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self->send_caps = self->pt != prev_pt && self->is_current_caps_red;
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}
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break;
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case PROP_DISTANCE:
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self->distance = g_value_get_uint (value);
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break;
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case PROP_ALLOW_NO_RED_BLOCKS:
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self->allow_no_red_blocks = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rtp_red_enc_get_property (GObject * object, guint prop_id,
|
|
GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstRtpRedEnc *self = GST_RTP_RED_ENC (object);
|
|
switch (prop_id) {
|
|
case PROP_PT:
|
|
g_value_set_int (value, self->pt);
|
|
break;
|
|
case PROP_SENT:
|
|
g_value_set_uint (value, self->num_sent);
|
|
break;
|
|
case PROP_DISTANCE:
|
|
g_value_set_uint (value, self->distance);
|
|
break;
|
|
case PROP_ALLOW_NO_RED_BLOCKS:
|
|
g_value_set_boolean (value, self->allow_no_red_blocks);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_rtp_red_enc_class_init (GstRtpRedEncClass * klass)
|
|
{
|
|
GObjectClass *gobject_class;
|
|
GstElementClass *element_class;
|
|
|
|
gobject_class = G_OBJECT_CLASS (klass);
|
|
element_class = GST_ELEMENT_CLASS (klass);
|
|
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&src_template));
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&sink_template));
|
|
|
|
gst_element_class_set_metadata (element_class,
|
|
"Redundant Audio Data (RED) Encoder",
|
|
"Codec/Payloader/Network/RTP",
|
|
"Encode Redundant Audio Data (RED)",
|
|
"Hani Mustafa <hani@pexip.com>, Mikhail Fludkov <misha@pexip.com>");
|
|
|
|
gobject_class->set_property =
|
|
GST_DEBUG_FUNCPTR (gst_rtp_red_enc_set_property);
|
|
gobject_class->get_property =
|
|
GST_DEBUG_FUNCPTR (gst_rtp_red_enc_get_property);
|
|
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_rtp_red_enc_dispose);
|
|
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PT,
|
|
g_param_spec_int ("pt", "payload type",
|
|
"Payload type FEC packets (-1 disable)",
|
|
0, 127, DEFAULT_PT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SENT,
|
|
g_param_spec_uint ("sent", "Sent",
|
|
"Count of sent packets",
|
|
0, G_MAXUINT32, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
|
|
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DISTANCE,
|
|
g_param_spec_uint ("distance", "RED distance",
|
|
"Tells which media packet to use as a redundant block "
|
|
"(0 - no redundant blocks, 1 to use previous packet, "
|
|
"2 to use the packet before previous, etc.)",
|
|
0, G_MAXUINT32, DEFAULT_DISTANCE,
|
|
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
g_object_class_install_property (G_OBJECT_CLASS (klass),
|
|
PROP_ALLOW_NO_RED_BLOCKS, g_param_spec_boolean ("allow-no-red-blocks",
|
|
"Allow no redundant blocks",
|
|
"true - can produce RED packets even without redundant blocks (distance==0) "
|
|
"false - RED packets will be produced only if distance>0",
|
|
DEFAULT_ALLOW_NO_RED_BLOCKS,
|
|
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
|
|
|
|
GST_DEBUG_CATEGORY_INIT (gst_rtp_red_enc_debug, "rtpredenc", 0,
|
|
"RTP RED Encoder");
|
|
}
|