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245 lines
7.6 KiB
C
245 lines
7.6 KiB
C
/*
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* GStreamer AVTP Plugin
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* Copyright (C) 2019 Intel Corporation
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-avtpcrfsync
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* @see_also: avtpcrfcheck
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*
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* Adjust the Presentation Time from AVTPDUs to align with the reference clock
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* provided by the CRF stream. For detailed information see chapter 10 in
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* https://standards.ieee.org/standard/1722-2016.html. A helpful aid for
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* visualizing CRF and it's advantages can be found at
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* http://grouper.ieee.org/groups/1722/contributions/2014/1722a-rsilfvast-Diagrams%20for%20Common%20Timing%20Grid%20and%20Presentation%20Time%20(for%20review%20and%20discussion).pdf
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* (Look at page 1).
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*
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* <refsect2>
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* <title>Example pipeline</title>
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* |[
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* gst-launch-1.0 audiotestsrc ! audioconvert ! avtpaafpay ! avtpcrfsync ! avtpsink
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* ]| This example pipeline will adjust the timestamps for rawaudio payload.
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* Refer to the avtpcrfcheck example to validate the adjusted timestamp.
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* </refsect2>
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*/
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#include <avtp.h>
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#include <avtp_aaf.h>
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#include <avtp_crf.h>
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#include <avtp_cvf.h>
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#include <glib.h>
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#include <math.h>
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#include "gstavtpcrfbase.h"
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#include "gstavtpcrfsync.h"
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#include "gstavtpcrfutil.h"
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GST_DEBUG_CATEGORY_STATIC (avtpcrfsync_debug);
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#define GST_CAT_DEFAULT (avtpcrfsync_debug)
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#define gst_avtp_crf_sync_parent_class parent_class
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G_DEFINE_TYPE (GstAvtpCrfSync, gst_avtp_crf_sync, GST_TYPE_AVTP_CRF_BASE);
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GST_ELEMENT_REGISTER_DEFINE (avtpcrfsync, "avtpcrfsync", GST_RANK_NONE,
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GST_TYPE_AVTP_CRF_SYNC);
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static GstFlowReturn gst_avtp_crf_sync_transform_ip (GstBaseTransform * parent,
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GstBuffer * buffer);
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static void
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gst_avtp_crf_sync_class_init (GstAvtpCrfSyncClass * klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_set_static_metadata (element_class,
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"Clock Reference Format (CRF) Synchronizer",
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"Filter/Network/AVTP",
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"Synchronize Presentation Time from AVTPDUs so they are phase-locked with clock provided by CRF stream",
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"Vedang Patel <vedang.patel@intel.com>");
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GST_BASE_TRANSFORM_CLASS (klass)->transform_ip =
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GST_DEBUG_FUNCPTR (gst_avtp_crf_sync_transform_ip);
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GST_DEBUG_CATEGORY_INIT (avtpcrfsync_debug, "avtpcrfsync", 0,
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"CRF Synchronizer");
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}
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static void
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gst_avtp_crf_sync_init (GstAvtpCrfSync * avtpcrfsync)
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{
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/* Nothing to do here. */
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}
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static void
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set_avtp_tstamp (GstAvtpCrfSync * avtpcrfsync, struct avtp_stream_pdu *pdu,
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GstClockTime tstamp)
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{
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int res;
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guint32 type;
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res =
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avtp_pdu_get ((struct avtp_common_pdu *) pdu, AVTP_FIELD_SUBTYPE, &type);
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g_assert (res == 0);
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switch (type) {
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case AVTP_SUBTYPE_AAF:
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_TIMESTAMP, tstamp);
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g_assert (res == 0);
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break;
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case AVTP_SUBTYPE_CVF:
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res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_TIMESTAMP, tstamp);
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g_assert (res == 0);
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break;
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default:
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GST_ERROR_OBJECT (avtpcrfsync, "type 0x%x not supported.\n", type);
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break;
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}
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}
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static void
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set_avtp_mr_bit (GstAvtpCrfSync * avtpcrfsync, struct avtp_stream_pdu *pdu,
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guint64 mr)
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{
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int res;
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guint32 type;
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res =
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avtp_pdu_get ((struct avtp_common_pdu *) pdu, AVTP_FIELD_SUBTYPE, &type);
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g_assert (res == 0);
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switch (type) {
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case AVTP_SUBTYPE_AAF:
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res = avtp_aaf_pdu_set (pdu, AVTP_AAF_FIELD_MR, mr);
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g_assert (res == 0);
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break;
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case AVTP_SUBTYPE_CVF:
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res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_MR, mr);
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g_assert (res == 0);
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break;
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default:
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GST_ERROR_OBJECT (avtpcrfsync, "type 0x%x not supported.\n", type);
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break;
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}
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}
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static GstFlowReturn
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gst_avtp_crf_sync_transform_ip (GstBaseTransform * parent, GstBuffer * buffer)
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{
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GstClockTime tstamp, h264_time = 0, adjusted_tstamp, adjusted_h264_time = 0;
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GstAvtpCrfBase *avtpcrfbase = GST_AVTP_CRF_BASE (parent);
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GstAvtpCrfSync *avtpcrfsync = GST_AVTP_CRF_SYNC (avtpcrfbase);
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GstAvtpCrfThreadData *thread_data = &avtpcrfbase->thread_data;
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GstClockTime current_ts = thread_data->current_ts;
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gdouble avg_period = thread_data->average_period;
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struct avtp_stream_pdu *pdu;
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gboolean h264_packet;
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GstMapInfo info;
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gboolean res;
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if (!avg_period || !current_ts) {
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GST_WARNING_OBJECT (avtpcrfsync, "No CRF packet yet received!");
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return GST_FLOW_OK;
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}
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res = gst_buffer_map (buffer, &info, GST_MAP_READWRITE);
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if (!res) {
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GST_ELEMENT_ERROR (avtpcrfsync, RESOURCE, OPEN_WRITE,
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("cannot access buffer"), (NULL));
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return GST_FLOW_ERROR;
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}
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if (!buffer_size_valid (&info)) {
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GST_DEBUG_OBJECT (avtpcrfsync, "Malformed AVTPDU, discarding it");
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goto exit;
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}
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pdu = (struct avtp_stream_pdu *) info.data;
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h264_packet = h264_tstamp_valid (pdu);
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if (h264_packet) {
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res = avtp_cvf_pdu_get (pdu, AVTP_CVF_FIELD_H264_TIMESTAMP, &h264_time);
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g_assert (res == 0);
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/*
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* Extrapolate H264 tstamp to 64 bit and assume it's greater than CRF
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* timestamp.
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*/
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h264_time |= current_ts & 0xFFFFFFFF00000000;
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if (h264_time < current_ts)
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h264_time += (1ULL << 32);
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/*
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* float typecasted to guint64 truncates the decimal part. So, round() it
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* before casting.
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*/
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adjusted_h264_time =
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(GstClockTime) roundl (current_ts + ceill (((gdouble) h264_time -
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current_ts) / avg_period) * avg_period);
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res =
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avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_H264_TIMESTAMP,
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adjusted_h264_time);
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g_assert (res == 0);
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GST_LOG_OBJECT (avtpcrfsync,
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"Adjust H264 timestamp in CVF packet. tstamp: %" G_GUINT64_FORMAT
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" adjusted_tstamp: %" G_GUINT64_FORMAT,
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h264_time & 0xFFFFFFFF, adjusted_h264_time & 0xFFFFFFFF);
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}
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tstamp = get_avtp_tstamp (avtpcrfbase, pdu);
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if (tstamp == GST_CLOCK_TIME_NONE)
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goto exit;
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/*
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* Extrapolate the 32-bit AVTP Timestamp to 64-bit and assume it's greater
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* than the 64-bit CRF timestamp.
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*/
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tstamp |= current_ts & 0xFFFFFFFF00000000;
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if (tstamp < current_ts)
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tstamp += (1ULL << 32);
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/*
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* float typecasted to guint64 truncates the decimal part. So, round() it
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* before casting.
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*/
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adjusted_tstamp =
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(GstClockTime) roundl (current_ts + ceill ((tstamp -
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current_ts) / avg_period) * avg_period);
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set_avtp_tstamp (avtpcrfsync, pdu, adjusted_tstamp);
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set_avtp_mr_bit (avtpcrfsync, pdu, thread_data->mr);
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GST_LOG_OBJECT (avtpcrfsync,
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"Adjust AVTP timestamp. tstamp: %" G_GUINT64_FORMAT
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" Adjusted tstamp: %" G_GUINT64_FORMAT,
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tstamp & 0xFFFFFFFF, adjusted_tstamp & 0xFFFFFFFF);
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/*
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* Since we adjusted the AVTP/H264 presentation times in the AVTPDU, we also
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* need to adjust buffer times by the same amount so that the buffer is
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* transmitted at the right time.
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*/
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if (h264_packet) {
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if (GST_BUFFER_DTS (buffer) != GST_CLOCK_TIME_NONE)
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GST_BUFFER_DTS (buffer) += adjusted_tstamp - tstamp;
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GST_BUFFER_PTS (buffer) += adjusted_h264_time - h264_time;
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} else {
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GST_BUFFER_PTS (buffer) += adjusted_tstamp - tstamp;
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}
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exit:
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gst_buffer_unmap (buffer, &info);
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return GST_FLOW_OK;
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}
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