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8702a1fa67
Extract a part which could be common with the AVTP RVF payload plugin to a separate class. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1335>
495 lines
15 KiB
C
495 lines
15 KiB
C
/*
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* GStreamer AVTP Plugin
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* Copyright (C) 2019 Intel Corporation
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* Copyright (c) 2021, Fastree3D
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* Adrian Fiergolski <Adrian.Fiergolski@fastree3d.com>
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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
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* 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
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* Free Software Foundation, Inc., 51 Franklin Street, 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-avtpcvfpay
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* @see_also: avtpcvfdepay
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*
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* Payload compressed video (currently, only H.264) into AVTPDUs according
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* to IEEE 1722-2016. For detailed information see
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* https://standards.ieee.org/standard/1722-2016.html.
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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 videotestsrc ! x264enc ! avtpcvfpay ! avtpsink
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* ]| This example pipeline will payload H.264 video. Refer to the avtpcvfdepay
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* example to depayload and play the AVTP stream.
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* </refsect2>
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*/
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#include <avtp.h>
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#include <avtp_cvf.h>
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#include "gstavtpcvfpay.h"
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GST_DEBUG_CATEGORY_STATIC (avtpcvfpay_debug);
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#define GST_CAT_DEFAULT avtpcvfpay_debug
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/* prototypes */
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static GstStateChangeReturn gst_avtp_cvf_change_state (GstElement *
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element, GstStateChange transition);
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static gboolean gst_avtp_cvf_pay_new_caps (GstAvtpVfPayBase * avtpvfpaybase,
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GstCaps * caps);
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static gboolean gst_avtp_cvf_pay_prepare_avtp_packets (GstAvtpVfPayBase *
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avtpvfpaybase, GstBuffer * buffer, GPtrArray * avtp_packets);
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enum
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{
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PROP_0,
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};
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#define AVTP_CVF_H264_HEADER_SIZE (sizeof(struct avtp_stream_pdu) + sizeof(guint32))
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#define FU_A_TYPE 28
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#define FU_A_HEADER_SIZE (sizeof(guint16))
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#define NRI_MASK 0x60
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#define NRI_SHIFT 5
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#define START_SHIFT 7
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#define END_SHIFT 6
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#define NAL_TYPE_MASK 0x1f
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#define FIRST_NAL_VCL_TYPE 0x01
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#define LAST_NAL_VCL_TYPE 0x05
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#define NAL_LEN_SIZE_MASK 0x03
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/* pad templates */
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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 ("video/x-h264, "
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"stream-format = (string) avc, alignment = (string) au")
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);
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/* class initialization */
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#define gst_avtp_cvf_pay_parent_class parent_class
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G_DEFINE_TYPE (GstAvtpCvfPay, gst_avtp_cvf_pay, GST_TYPE_AVTP_VF_PAY_BASE);
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GST_ELEMENT_REGISTER_DEFINE (avtpcvfpay, "avtpcvfpay", GST_RANK_NONE,
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GST_TYPE_AVTP_CVF_PAY);
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static void
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gst_avtp_cvf_pay_class_init (GstAvtpCvfPayClass * klass)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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GstAvtpVfPayBaseClass *avtpvfpaybase_class =
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GST_AVTP_VF_PAY_BASE_CLASS (klass);
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gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"AVTP Compressed Video Format (CVF) payloader",
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"Codec/Payloader/Network/AVTP",
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"Payload-encode compressed video into CVF AVTPDU (IEEE 1722)",
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"Ederson de Souza <ederson.desouza@intel.com>");
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_avtp_cvf_change_state);
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avtpvfpaybase_class->new_caps = GST_DEBUG_FUNCPTR (gst_avtp_cvf_pay_new_caps);
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avtpvfpaybase_class->prepare_avtp_packets =
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GST_DEBUG_FUNCPTR (gst_avtp_cvf_pay_prepare_avtp_packets);
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GST_DEBUG_CATEGORY_INIT (avtpcvfpay_debug, "avtpcvfpay",
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0, "debug category for avtpcvfpay element");
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}
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static void
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gst_avtp_cvf_pay_init (GstAvtpCvfPay * avtpcvfpay)
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{
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avtpcvfpay->header = NULL;
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avtpcvfpay->nal_length_size = 0;
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}
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static GstStateChangeReturn
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gst_avtp_cvf_change_state (GstElement * element, GstStateChange transition)
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{
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GstAvtpCvfPay *avtpcvfpay = GST_AVTP_CVF_PAY (element);
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GstAvtpBasePayload *avtpbasepayload = GST_AVTP_BASE_PAYLOAD (avtpcvfpay);
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GstStateChangeReturn ret;
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if (transition == GST_STATE_CHANGE_NULL_TO_READY) {
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GstMapInfo map;
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struct avtp_stream_pdu *pdu;
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int res;
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avtpcvfpay->header = gst_buffer_new_allocate (NULL,
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AVTP_CVF_H264_HEADER_SIZE, NULL);
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if (avtpcvfpay->header == NULL) {
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GST_ERROR_OBJECT (avtpcvfpay, "Could not allocate buffer");
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return GST_STATE_CHANGE_FAILURE;
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}
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gst_buffer_map (avtpcvfpay->header, &map, GST_MAP_WRITE);
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pdu = (struct avtp_stream_pdu *) map.data;
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res = avtp_cvf_pdu_init (pdu, AVTP_CVF_FORMAT_SUBTYPE_H264);
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g_assert (res == 0);
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res =
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avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_STREAM_ID,
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avtpbasepayload->streamid);
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g_assert (res == 0);
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gst_buffer_unmap (avtpcvfpay->header, &map);
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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return ret;
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}
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if (transition == GST_STATE_CHANGE_READY_TO_NULL) {
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gst_buffer_unref (avtpcvfpay->header);
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}
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return ret;
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}
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static void
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gst_avtp_cvf_pay_extract_nals (GstAvtpCvfPay * avtpcvfpay,
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GstBuffer * buffer, GPtrArray * nals)
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{
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/* The buffer may have more than one NAL. They are grouped together, and before
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* each NAL there are some bytes that indicate how big is the NAL */
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gsize size, offset = 0;
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GstMapInfo map;
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guint8 *data;
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gboolean res;
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if (G_UNLIKELY (avtpcvfpay->nal_length_size == 0)) {
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GST_ERROR_OBJECT (avtpcvfpay,
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"Can't extract NAL units without nal length size. Missing codec_data caps?");
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goto end;
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}
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res = gst_buffer_map (buffer, &map, GST_MAP_READ);
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if (!res) {
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GST_ERROR_OBJECT (avtpcvfpay, "Could not map buffer");
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goto end;
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}
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size = map.size;
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data = map.data;
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while (size > avtpcvfpay->nal_length_size) {
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gint i;
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guint nal_len = 0;
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GstBuffer *nal;
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/* Gets NAL length */
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for (i = 0; i < avtpcvfpay->nal_length_size; i++) {
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nal_len = (nal_len << 8) + data[i];
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}
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if (nal_len == 0) {
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GST_WARNING_OBJECT (avtpcvfpay, "Invalid NAL unit size: 0");
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break;
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}
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offset += avtpcvfpay->nal_length_size;
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data += avtpcvfpay->nal_length_size;
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size -= avtpcvfpay->nal_length_size;
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if (G_UNLIKELY (size < nal_len)) {
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GST_WARNING_OBJECT (avtpcvfpay,
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"Got incomplete NAL: NAL len %u, buffer len %zu", nal_len, size);
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nal_len = size;
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}
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nal = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, offset, nal_len);
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GST_BUFFER_PTS (nal) = GST_BUFFER_PTS (buffer);
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GST_BUFFER_DTS (nal) = GST_BUFFER_DTS (buffer);
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g_ptr_array_add (nals, nal);
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offset += nal_len;
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data += nal_len;
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size -= nal_len;
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}
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gst_buffer_unmap (buffer, &map);
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end:
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/* This function consumes the buffer, and all references to it are in the
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* extracted nals, so we can release the reference to the buffer itself */
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gst_buffer_unref (buffer);
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GST_LOG_OBJECT (avtpcvfpay, "Extracted %u NALu's from buffer", nals->len);
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}
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static gboolean
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gst_avtp_cvf_pay_is_nal_vcl (GstAvtpCvfPay * avtpcvfpay, GstBuffer * nal)
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{
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guint8 nal_header, nal_type;
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gst_buffer_extract (nal, 0, &nal_header, 1);
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nal_type = nal_header & NAL_TYPE_MASK;
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return nal_type >= FIRST_NAL_VCL_TYPE && nal_type <= LAST_NAL_VCL_TYPE;
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}
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static GstBuffer *
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gst_avtpcvpay_fragment_nal (GstAvtpCvfPay * avtpcvfpay, GstBuffer * nal,
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gsize * offset, gboolean * last_fragment)
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{
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GstAvtpVfPayBase *avtpvfpaybase = GST_AVTP_VF_PAY_BASE (avtpcvfpay);
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GstBuffer *fragment_header, *fragment;
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guint8 nal_header, nal_type, nal_nri, fu_indicator, fu_header;
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gsize available, nal_size, fragment_size, remaining;
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GstMapInfo map;
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nal_size = gst_buffer_get_size (nal);
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/* If NAL + header will be smaller than MTU, nothing to fragment */
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if (*offset == 0
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&& (nal_size + AVTP_CVF_H264_HEADER_SIZE) <= avtpvfpaybase->mtu) {
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*last_fragment = TRUE;
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*offset = nal_size;
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GST_DEBUG_OBJECT (avtpcvfpay,
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"Generated fragment with size %" G_GSIZE_FORMAT, nal_size);
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return gst_buffer_ref (nal);
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}
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/* We're done with this buffer */
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if (*offset == nal_size) {
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return NULL;
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}
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*last_fragment = FALSE;
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/* Remaining size is smaller than MTU, so this is the last fragment */
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remaining = nal_size - *offset + AVTP_CVF_H264_HEADER_SIZE + FU_A_HEADER_SIZE;
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if (remaining <= avtpvfpaybase->mtu) {
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*last_fragment = TRUE;
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}
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fragment_header = gst_buffer_new_allocate (NULL, FU_A_HEADER_SIZE, NULL);
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if (G_UNLIKELY (fragment_header == NULL)) {
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GST_ERROR_OBJECT (avtpcvfpay, "Could not allocate memory for buffer");
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return NULL;
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}
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/* NAL header info is spread to all FUs */
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gst_buffer_extract (nal, 0, &nal_header, 1);
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nal_type = nal_header & NAL_TYPE_MASK;
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nal_nri = (nal_header & NRI_MASK) >> NRI_SHIFT;
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fu_indicator = (nal_nri << NRI_SHIFT) | FU_A_TYPE;
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fu_header = ((*offset == 0) << START_SHIFT) |
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((*last_fragment == TRUE) << END_SHIFT) | nal_type;
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gst_buffer_map (fragment_header, &map, GST_MAP_WRITE);
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map.data[0] = fu_indicator;
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map.data[1] = fu_header;
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gst_buffer_unmap (fragment_header, &map);
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available =
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avtpvfpaybase->mtu - AVTP_CVF_H264_HEADER_SIZE -
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gst_buffer_get_size (fragment_header);
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/* NAL unit header is not sent, but spread into FU indicator and header,
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* and reconstructed on depayloader */
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if (*offset == 0)
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*offset = 1;
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fragment_size =
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available < (nal_size - *offset) ? available : (nal_size - *offset);
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fragment =
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gst_buffer_append (fragment_header, gst_buffer_copy_region (nal,
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GST_BUFFER_COPY_MEMORY, *offset, fragment_size));
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*offset += fragment_size;
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GST_DEBUG_OBJECT (avtpcvfpay,
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"Generated fragment with size %" G_GSIZE_FORMAT, fragment_size);
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return fragment;
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}
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static gboolean
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gst_avtp_cvf_pay_prepare_avtp_packets (GstAvtpVfPayBase * avtpvfpaybase,
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GstBuffer * buffer, GPtrArray * avtp_packets)
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{
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GstAvtpBasePayload *avtpbasepayload = GST_AVTP_BASE_PAYLOAD (avtpvfpaybase);
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GstAvtpCvfPay *avtpcvfpay = GST_AVTP_CVF_PAY (avtpvfpaybase);
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GPtrArray *nals;
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GstBuffer *header, *nal;
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GstMapInfo map;
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gint i;
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/* Get all NALs inside buffer */
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nals = g_ptr_array_new ();
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gst_avtp_cvf_pay_extract_nals (avtpcvfpay, buffer, nals);
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for (i = 0; i < nals->len; i++) {
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guint64 avtp_time, h264_time;
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gboolean last_fragment;
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GstBuffer *fragment;
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gsize offset;
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nal = g_ptr_array_index (nals, i);
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GST_LOG_OBJECT (avtpcvfpay,
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"Preparing AVTP packets for NAL whose size is %" G_GSIZE_FORMAT,
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gst_buffer_get_size (nal));
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/* Calculate timestamps. Note that we do it twice, one using DTS as base,
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* the other using PTS - using code inherited from avtpbasepayload.
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* Also worth noting: `avtpbasepayload->latency` is updated after
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* first call to gst_avtp_base_payload_calc_ptime, so we MUST call
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* it before using the latency value */
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h264_time = gst_avtp_base_payload_calc_ptime (avtpbasepayload, nal);
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avtp_time =
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gst_element_get_base_time (GST_ELEMENT (avtpcvfpay)) +
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gst_segment_to_running_time (&avtpbasepayload->segment, GST_FORMAT_TIME,
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GST_BUFFER_DTS_OR_PTS (nal)) + avtpbasepayload->mtt +
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avtpbasepayload->tu + avtpbasepayload->processing_deadline +
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avtpbasepayload->latency;
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offset = 0;
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while ((fragment =
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gst_avtpcvpay_fragment_nal (avtpcvfpay, nal, &offset,
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&last_fragment))) {
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GstBuffer *packet;
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struct avtp_stream_pdu *pdu;
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gint res;
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/* Copy header to reuse common fields and change what is needed */
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header = gst_buffer_copy (avtpcvfpay->header);
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gst_buffer_map (header, &map, GST_MAP_WRITE);
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pdu = (struct avtp_stream_pdu *) map.data;
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/* Stream data len includes AVTP H264 header len as this is part of
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* the payload too. It's just the uint32_t with the h264 timestamp*/
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res =
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avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_STREAM_DATA_LEN,
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gst_buffer_get_size (fragment) + sizeof (uint32_t));
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g_assert (res == 0);
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res =
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avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_SEQ_NUM,
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avtpbasepayload->seqnum++);
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g_assert (res == 0);
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/* Although AVTP_TIMESTAMP is only set on the very last fragment, IEEE 1722
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* doesn't mention such need for H264_TIMESTAMP. So, we set it for all
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* fragments */
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res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_H264_TIMESTAMP, h264_time);
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g_assert (res == 0);
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res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_H264_PTV, 1);
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g_assert (res == 0);
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/* Only last fragment should have M, AVTP_TS and TV fields set */
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if (last_fragment) {
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gboolean M;
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res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_TV, 1);
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g_assert (res == 0);
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res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_TIMESTAMP, avtp_time);
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g_assert (res == 0);
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/* Set M only if last NAL and it is a VCL NAL */
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M = (i == nals->len - 1)
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&& gst_avtp_cvf_pay_is_nal_vcl (avtpcvfpay, nal);
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res = avtp_cvf_pdu_set (pdu, AVTP_CVF_FIELD_M, M);
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g_assert (res == 0);
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if (M) {
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GST_LOG_OBJECT (avtpcvfpay, "M packet sent, PTS: %" GST_TIME_FORMAT
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" DTS: %" GST_TIME_FORMAT " AVTP_TS: %" GST_TIME_FORMAT
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" H264_TS: %" GST_TIME_FORMAT "\navtp_time: %" G_GUINT64_FORMAT
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" h264_time: %" G_GUINT64_FORMAT, GST_TIME_ARGS (h264_time),
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GST_TIME_ARGS (avtp_time), GST_TIME_ARGS (avtp_time & 0xffffffff),
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GST_TIME_ARGS (h264_time & 0xffffffff), avtp_time, h264_time);
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}
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}
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packet = gst_buffer_append (header, fragment);
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/* Keep original timestamps */
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GST_BUFFER_PTS (packet) = GST_BUFFER_PTS (nal);
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GST_BUFFER_DTS (packet) = GST_BUFFER_DTS (nal);
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g_ptr_array_add (avtp_packets, packet);
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gst_buffer_unmap (header, &map);
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}
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gst_buffer_unref (nal);
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}
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g_ptr_array_free (nals, TRUE);
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|
|
|
GST_LOG_OBJECT (avtpcvfpay, "Prepared %u AVTP packets", avtp_packets->len);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_avtp_cvf_pay_new_caps (GstAvtpVfPayBase * avtpvfpaybase, GstCaps * caps)
|
|
{
|
|
GstAvtpCvfPay *avtpcvfpay = GST_AVTP_CVF_PAY (avtpvfpaybase);
|
|
const GValue *value;
|
|
GstStructure *str;
|
|
GstBuffer *buffer;
|
|
GstMapInfo map;
|
|
|
|
str = gst_caps_get_structure (caps, 0);
|
|
|
|
if ((value = gst_structure_get_value (str, "codec_data"))) {
|
|
guint8 *data;
|
|
gsize size;
|
|
|
|
buffer = gst_value_get_buffer (value);
|
|
gst_buffer_map (buffer, &map, GST_MAP_READ);
|
|
data = map.data;
|
|
size = map.size;
|
|
|
|
if (G_UNLIKELY (size < 7)) {
|
|
GST_ERROR_OBJECT (avtpcvfpay, "avcC size %" G_GSIZE_FORMAT " < 7", size);
|
|
goto error;
|
|
}
|
|
if (G_UNLIKELY (data[0] != 1)) {
|
|
GST_ERROR_OBJECT (avtpcvfpay, "avcC version %u != 1", data[0]);
|
|
goto error;
|
|
}
|
|
|
|
/* Number of bytes in front of NAL units marking their size */
|
|
avtpcvfpay->nal_length_size = (data[4] & NAL_LEN_SIZE_MASK) + 1;
|
|
GST_DEBUG_OBJECT (avtpcvfpay, "Got NAL length from caps: %u",
|
|
avtpcvfpay->nal_length_size);
|
|
|
|
gst_buffer_unmap (buffer, &map);
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
error:
|
|
gst_buffer_unmap (buffer, &map);
|
|
return FALSE;
|
|
}
|