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3b4f3a0b3f
This patch introduces the AVTP Compressed Video Format (CVF) payloader specified in IEEE 1722-2016 section 8. Currently, this payload only supports H.264 encapsulation described in section 8.5. Is also worth noting that only single NAL units are encapsulated: no aggregation or fragmentation is performed by the payloader. An interesting characteristic of CVF H.264 spec is that it defines an H264_TIMESTAMP, in addition to the AVTP timestamp. The later is translated to the GST_BUFFER_DTS while the former is translated to the GST_BUFFER_PTS. From AVTP CVF H.264 spec, it is clear that the AVTP timestamp is related to the decoding order, while the H264_TIMESTAMP is an ancillary information to the H.264 decoder. Upon receiving a buffer containing a group of NAL units, the avtpcvfpay element will extract each NAL unit and payload them into individual AVTP packets. The last AVTP packet generated for a group of NAL units will have the M bit set, so the depayloader is able to properly regroup them. The exact format of the buffer of NAL units is described on the 'codec_data' capability, which is parsed by the avtpcvfpay, in the same way done in rtph264pay. This patch reuses the infra provided by gstavtpbasepayload.c.
67 lines
1.9 KiB
C
67 lines
1.9 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 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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#ifndef __GST_AVTP_CVF_PAY_H__
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#define __GST_AVTP_CVF_PAY_H__
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#include <gst/gst.h>
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#include "gstavtpbasepayload.h"
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G_BEGIN_DECLS
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#define GST_TYPE_AVTP_CVF_PAY (gst_avtp_cvf_pay_get_type())
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#define GST_AVTP_CVF_PAY(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AVTP_CVF_PAY,GstAvtpCvfPay))
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#define GST_AVTP_CVF_PAY_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AVTP_CVF_PAY,GstAvtpCvfPayClass))
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#define GST_IS_AVTP_CVF_PAY(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AVTP_CVF_PAY))
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#define GST_IS_AVTP_CVF_PAY_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AVTP_CVF_PAY))
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typedef struct _GstAvtpCvfPay GstAvtpCvfPay;
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typedef struct _GstAvtpCvfPayClass GstAvtpCvfPayClass;
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struct _GstAvtpCvfPay
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{
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GstAvtpBasePayload payload;
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GstBuffer *header;
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guint mtu;
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/* H.264 specific information */
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guint8 nal_length_size;
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};
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struct _GstAvtpCvfPayClass
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{
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GstAvtpBasePayloadClass parent_class;
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};
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GType gst_avtp_cvf_pay_get_type (void);
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gboolean gst_avtp_cvf_pay_plugin_init (GstPlugin * plugin);
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G_END_DECLS
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#endif /* __GST_AVTP_CVF_PAY_H__ */
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