2 * Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) 2004,2006 Thomas Vander Stichele <thomas at apestaart dot org>
5 * dataprotocol.h: Functions implementing the GStreamer Data Protocol
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
23 #ifndef __GST_DATA_PROTOCOL_H__
24 #define __GST_DATA_PROTOCOL_H__
26 #include <gst/gstbuffer.h>
27 #include <gst/gstevent.h>
28 #include <gst/gstcaps.h>
33 * GST_DP_HEADER_LENGTH:
35 * The header size in bytes.
37 #define GST_DP_HEADER_LENGTH 62
41 * @GST_DP_HEADER_FLAG_NONE: No flag present.
42 * @GST_DP_HEADER_FLAG_CRC_HEADER: a header CRC field is present.
43 * @GST_DP_HEADER_FLAG_CRC_PAYLOAD: a payload CRC field is present.
44 * @GST_DP_HEADER_FLAG_CRC: a CRC for header and payload is present.
46 * header flags for the dataprotocol.
49 GST_DP_HEADER_FLAG_NONE = 0,
50 GST_DP_HEADER_FLAG_CRC_HEADER = (1 << 0),
51 GST_DP_HEADER_FLAG_CRC_PAYLOAD = (1 << 1),
52 GST_DP_HEADER_FLAG_CRC = (1 << 1) | (1 << 0),
57 * @GST_DP_PAYLOAD_NONE: Invalid payload type.
58 * @GST_DP_PAYLOAD_BUFFER: #GstBuffer payload packet.
59 * @GST_DP_PAYLOAD_CAPS: #GstCaps payload packet.
60 * @GST_DP_PAYLOAD_EVENT_NONE: First value of #GstEvent payload packets.
62 * The GDP payload types. a #GstEvent payload type is encoded with the
63 * event type number starting from @GST_DP_PAYLOAD_EVENT_NONE.
66 GST_DP_PAYLOAD_NONE = 0,
67 GST_DP_PAYLOAD_BUFFER,
69 GST_DP_PAYLOAD_EVENT_NONE = 64,
72 void gst_dp_init (void);
74 /* payload information from header */
75 guint32 gst_dp_header_payload_length (const guint8 * header);
77 gst_dp_header_payload_type (const guint8 * header);
79 /* converting to GstBuffer/GstEvent/GstCaps */
80 GstBuffer * gst_dp_buffer_from_header (guint header_length,
81 const guint8 * header,
82 GstAllocator * allocator,
83 GstAllocationParams * allocation_params);
84 GstCaps * gst_dp_caps_from_packet (guint header_length,
85 const guint8 * header,
86 const guint8 * payload);
87 GstEvent * gst_dp_event_from_packet (guint header_length,
88 const guint8 * header,
89 const guint8 * payload);
91 /* payloading GstBuffer/GstEvent/GstCaps */
92 GstBuffer * gst_dp_payload_buffer (GstBuffer * buffer,
93 GstDPHeaderFlag flags);
95 GstBuffer * gst_dp_payload_caps (const GstCaps * caps,
96 GstDPHeaderFlag flags);
98 GstBuffer * gst_dp_payload_event (const GstEvent * event,
99 GstDPHeaderFlag flags);
102 gboolean gst_dp_validate_header (guint header_length,
103 const guint8 * header);
104 gboolean gst_dp_validate_payload (guint header_length,
105 const guint8 * header,
106 const guint8 * payload);
107 gboolean gst_dp_validate_packet (guint header_length,
108 const guint8 * header,
109 const guint8 * payload);
113 #endif /* __GST_DATA_PROTOCOL_H__ */