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113 lines
4.4 KiB
C
113 lines
4.4 KiB
C
/* GStreamer
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* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) 2004,2006 Thomas Vander Stichele <thomas at apestaart dot org>
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*
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* dataprotocol.h: Functions implementing the GStreamer Data Protocol
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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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#ifndef __GST_DATA_PROTOCOL_H__
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#define __GST_DATA_PROTOCOL_H__
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#include <gst/gstbuffer.h>
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#include <gst/gstevent.h>
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#include <gst/gstcaps.h>
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G_BEGIN_DECLS
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/**
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* GST_DP_HEADER_LENGTH:
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*
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* The header size in bytes.
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*/
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#define GST_DP_HEADER_LENGTH 62
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/**
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* GstDPHeaderFlag:
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* @GST_DP_HEADER_FLAG_NONE: No flag present.
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* @GST_DP_HEADER_FLAG_CRC_HEADER: a header CRC field is present.
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* @GST_DP_HEADER_FLAG_CRC_PAYLOAD: a payload CRC field is present.
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* @GST_DP_HEADER_FLAG_CRC: a CRC for header and payload is present.
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*
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* header flags for the dataprotocol.
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*/
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typedef enum {
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GST_DP_HEADER_FLAG_NONE = 0,
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GST_DP_HEADER_FLAG_CRC_HEADER = (1 << 0),
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GST_DP_HEADER_FLAG_CRC_PAYLOAD = (1 << 1),
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GST_DP_HEADER_FLAG_CRC = (1 << 1) | (1 << 0),
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} GstDPHeaderFlag;
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/**
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* GstDPPayloadType:
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* @GST_DP_PAYLOAD_NONE: Invalid payload type.
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* @GST_DP_PAYLOAD_BUFFER: #GstBuffer payload packet.
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* @GST_DP_PAYLOAD_CAPS: #GstCaps payload packet.
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* @GST_DP_PAYLOAD_EVENT_NONE: First value of #GstEvent payload packets.
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*
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* The GDP payload types. a #GstEvent payload type is encoded with the
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* event type number starting from @GST_DP_PAYLOAD_EVENT_NONE.
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*/
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typedef enum {
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GST_DP_PAYLOAD_NONE = 0,
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GST_DP_PAYLOAD_BUFFER,
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GST_DP_PAYLOAD_CAPS,
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GST_DP_PAYLOAD_EVENT_NONE = 64,
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} GstDPPayloadType;
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void gst_dp_init (void);
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/* payload information from header */
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guint32 gst_dp_header_payload_length (const guint8 * header);
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GstDPPayloadType
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gst_dp_header_payload_type (const guint8 * header);
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/* converting to GstBuffer/GstEvent/GstCaps */
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GstBuffer * gst_dp_buffer_from_header (guint header_length,
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const guint8 * header,
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GstAllocator * allocator,
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GstAllocationParams * allocation_params);
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GstCaps * gst_dp_caps_from_packet (guint header_length,
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const guint8 * header,
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const guint8 * payload);
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GstEvent * gst_dp_event_from_packet (guint header_length,
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const guint8 * header,
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const guint8 * payload);
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/* payloading GstBuffer/GstEvent/GstCaps */
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GstBuffer * gst_dp_payload_buffer (GstBuffer * buffer,
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GstDPHeaderFlag flags);
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GstBuffer * gst_dp_payload_caps (const GstCaps * caps,
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GstDPHeaderFlag flags);
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GstBuffer * gst_dp_payload_event (const GstEvent * event,
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GstDPHeaderFlag flags);
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/* validation */
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gboolean gst_dp_validate_header (guint header_length,
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const guint8 * header);
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gboolean gst_dp_validate_payload (guint header_length,
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const guint8 * header,
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const guint8 * payload);
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gboolean gst_dp_validate_packet (guint header_length,
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const guint8 * header,
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const guint8 * payload);
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G_END_DECLS
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#endif /* __GST_DATA_PROTOCOL_H__ */
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