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ef8d630a59
Implementation according to RFC 4587. Payloader create fragments on MB boundaries in order to match MTU size the best it can. Some decoders/depayloaders in the wild are very strict about receiving a continuous bit-stream (e.g. no no-op bits between frames), so the payloader will shift the compressed bit-stream of a frame to align with the last significant bit of the previous frame. Depayloader does not try to be fancy in case of packet loss. It simply drops all packets for a frame if there is a loss, keeping it simple. https://bugzilla.gnome.org/show_bug.cgi?id=751886
100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/* GStreamer
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* Copyright (C) <2014> Stian Selnes <stian@pexip.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 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author: Dejan Sakelsak sahel@kiberpipa.org
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*/
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#ifndef __GST_RTP_H261_PAY_H__
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#define __GST_RTP_H261_PAY_H__
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#include <gst/gst.h>
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#include <gst/rtp/gstrtpbasepayload.h>
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#include <gst/base/gstadapter.h>
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G_BEGIN_DECLS
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#define GST_TYPE_RTP_H261_PAY \
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(gst_rtp_h261_pay_get_type())
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#define GST_RTP_H261_PAY(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_H261_PAY,GstRtpH261Pay))
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#define GST_RTP_H261_PAY_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_H261_PAY,GstRtpH261PayClass))
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#define GST_IS_RTP_H261_PAY(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_H261_PAY))
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#define GST_IS_RTP_H261_PAY_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_H261_PAY))
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typedef struct _GstRtpH261PayClass GstRtpH261PayClass;
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typedef struct _GstRtpH261Pay GstRtpH261Pay;
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struct _GstRtpH261Pay
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{
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GstRTPBasePayload payload;
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GstAdapter *adapter;
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gint offset;
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GstClockTime timestamp;
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};
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struct _GstRtpH261PayClass
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{
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GstRTPBasePayloadClass parent_class;
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};
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typedef struct _GstRtpH261PayHeader
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{
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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unsigned int v:1; /* Motion vector flag */
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unsigned int i:1; /* Intra encoded data */
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unsigned int ebit:3; /* End position */
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unsigned int sbit:3; /* Start position */
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unsigned int mbap1:4; /* MB address predictor - part1 */
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unsigned int gobn:4; /* GOB number */
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unsigned int hmvd1:2; /* Horizontal motion vector data - part1 */
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unsigned int quant:5; /* Quantizer */
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unsigned int mbap2:1; /* MB address predictor - part2 */
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unsigned int vmvd:5; /* Horizontal motion vector data - part1 */
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unsigned int hmvd2:3; /* Vertical motion vector data */
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#elif G_BYTE_ORDER == G_BIG_ENDIAN
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unsigned int sbit:3; /* Start position */
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unsigned int ebit:3; /* End position */
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unsigned int i:1; /* Intra encoded data */
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unsigned int v:1; /* Motion vector flag */
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unsigned int gobn:4; /* GOB number */
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unsigned int mbap1:4; /* MB address predictor - part1 */
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unsigned int mbap2:1; /* MB address predictor - part2 */
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unsigned int quant:5; /* Quantizer */
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unsigned int hmvd1:2; /* Horizontal motion vector data - part1 */
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unsigned int hmvd2:3; /* Vertical motion vector data */
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unsigned int vmvd:5; /* Horizontal motion vector data - part1 */
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#else
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#error "G_BYTE_ORDER should be big or little endian."
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#endif
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} GstRtpH261PayHeader;
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#define GST_RTP_H261_PAYLOAD_HEADER_LEN 4
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GType gst_rtp_h261_pay_get_type (void);
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gboolean gst_rtp_h261_pay_plugin_init (GstPlugin * plugin);
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G_END_DECLS
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#endif /* __GST_RTP_H261_PAY_H__ */
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