mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-30 04:00:37 +00:00
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.
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/*
|
|
* GStreamer AVTP Plugin
|
|
* Copyright (C) 2019 Intel Corporation
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later
|
|
* version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
* Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef __GST_AVTP_CVF_PAY_H__
|
|
#define __GST_AVTP_CVF_PAY_H__
|
|
|
|
#include <gst/gst.h>
|
|
|
|
#include "gstavtpbasepayload.h"
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define GST_TYPE_AVTP_CVF_PAY (gst_avtp_cvf_pay_get_type())
|
|
#define GST_AVTP_CVF_PAY(obj) \
|
|
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AVTP_CVF_PAY,GstAvtpCvfPay))
|
|
#define GST_AVTP_CVF_PAY_CLASS(klass) \
|
|
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AVTP_CVF_PAY,GstAvtpCvfPayClass))
|
|
#define GST_IS_AVTP_CVF_PAY(obj) \
|
|
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AVTP_CVF_PAY))
|
|
#define GST_IS_AVTP_CVF_PAY_CLASS(klass) \
|
|
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AVTP_CVF_PAY))
|
|
|
|
typedef struct _GstAvtpCvfPay GstAvtpCvfPay;
|
|
typedef struct _GstAvtpCvfPayClass GstAvtpCvfPayClass;
|
|
|
|
struct _GstAvtpCvfPay
|
|
{
|
|
GstAvtpBasePayload payload;
|
|
|
|
GstBuffer *header;
|
|
guint mtu;
|
|
|
|
/* H.264 specific information */
|
|
guint8 nal_length_size;
|
|
};
|
|
|
|
struct _GstAvtpCvfPayClass
|
|
{
|
|
GstAvtpBasePayloadClass parent_class;
|
|
};
|
|
|
|
GType gst_avtp_cvf_pay_get_type (void);
|
|
|
|
gboolean gst_avtp_cvf_pay_plugin_init (GstPlugin * plugin);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_AVTP_CVF_PAY_H__ */
|