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gdp: factor out some common header init code

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Original commit message from CVS:
* libs/gst/dataprotocol/dataprotocol.c:
(gst_dp_header_from_buffer), (gst_dp_packet_from_caps),
(gst_dp_packet_from_event):
factor out some common header init code
This commit is contained in:
Thomas Vander Stichele 2006-06-02 10:58:47 +00:00 committed by Tim-Philipp Müller
parent c0fc54e2b4
commit cbb7337a93
1 changed files with 24 additions and 31 deletions
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55
gst/gdp/dataprotocol.c
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@ -1,6 +1,6 @@
/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
* Copyright (C) 2004,2006 Thomas Vander Stichele <thomas at apestaart dot org>
*
* dataprotocol.c: Functions implementing the GStreamer Data Protocol
*
@ -34,6 +34,23 @@
GST_DEBUG_CATEGORY (data_protocol_debug);
#define GST_CAT_DEFAULT data_protocol_debug
/* helper macros */
/* write first 6 bytes of header, as well as ABI padding */
#define GST_DP_INIT_HEADER(h, maj, min, flags, type) \
G_STMT_START { \
\
h[0] = (guint8) maj; \
h[1] = (guint8) min; \
h[2] = (guint8) flags; \
h[3] = 0; /* padding byte */ \
GST_WRITE_UINT16_BE (h + 4, type); \
\
GST_WRITE_UINT64_BE (h + 42, (guint64) 0); /* ABI padding */ \
GST_WRITE_UINT64_BE (h + 50, (guint64) 0); /* ABI padding */ \
} G_STMT_END
/* calculate a CCITT 16 bit CRC check value for a given byte array */
/*
* this code snippet is adapted from a web page I found
@ -184,11 +201,8 @@ gst_dp_header_from_buffer (const GstBuffer * buffer, GstDPHeaderFlag flags,
h = g_malloc0 (GST_DP_HEADER_LENGTH);
/* version, flags, type */
h[0] = (guint8) GST_DP_VERSION_MAJOR;
h[1] = (guint8) GST_DP_VERSION_MINOR;
h[2] = (guint8) flags;
h[3] = 0; /* padding byte */
GST_WRITE_UINT16_BE (h + 4, GST_DP_PAYLOAD_BUFFER);
GST_DP_INIT_HEADER (h, GST_DP_VERSION_MAJOR, GST_DP_VERSION_MINOR, flags,
GST_DP_PAYLOAD_BUFFER);
/* buffer properties */
GST_WRITE_UINT32_BE (h + 6, GST_BUFFER_SIZE (buffer));
@ -197,18 +211,13 @@ gst_dp_header_from_buffer (const GstBuffer * buffer, GstDPHeaderFlag flags,
GST_WRITE_UINT64_BE (h + 26, GST_BUFFER_OFFSET (buffer));
GST_WRITE_UINT64_BE (h + 34, GST_BUFFER_OFFSET_END (buffer));
/* data flags */
/* data flags; eats two bytes from the ABI area */
/* we only copy KEY_UNIT,DELTA_UNIT and IN_CAPS flags */
flags_mask = GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_IN_CAPS |
GST_BUFFER_FLAG_DELTA_UNIT;
GST_WRITE_UINT16_BE (h + 42, GST_BUFFER_FLAGS (buffer) & flags_mask);
/* ABI padding */
GST_WRITE_UINT64_BE (h + 44, (guint64) 0);
GST_WRITE_UINT32_BE (h + 52, (guint32) 0);
GST_WRITE_UINT16_BE (h + 56, (guint16) 0);
/* CRC */
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_HEADER) {
@ -261,11 +270,8 @@ gst_dp_packet_from_caps (const GstCaps * caps, GstDPHeaderFlag flags,
string = (guchar *) gst_caps_to_string (caps);
/* version, flags, type */
h[0] = (guint8) GST_DP_VERSION_MAJOR;
h[1] = (guint8) GST_DP_VERSION_MINOR;
h[2] = (guint8) flags;
h[3] = 0; /* padding bytes */
GST_WRITE_UINT16_BE (h + 4, GST_DP_PAYLOAD_CAPS);
GST_DP_INIT_HEADER (h, GST_DP_VERSION_MAJOR, GST_DP_VERSION_MINOR, flags,
GST_DP_PAYLOAD_CAPS);
/* buffer properties */
GST_WRITE_UINT32_BE (h + 6, strlen ((gchar *) string) + 1); /* include trailing 0 */
@ -274,10 +280,6 @@ gst_dp_packet_from_caps (const GstCaps * caps, GstDPHeaderFlag flags,
GST_WRITE_UINT64_BE (h + 26, (guint64) 0);
GST_WRITE_UINT64_BE (h + 34, (guint64) 0);
/* ABI padding */
GST_WRITE_UINT64_BE (h + 42, (guint64) 0);
GST_WRITE_UINT64_BE (h + 50, (guint64) 0);
/* CRC */
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_HEADER) {
@ -377,11 +379,7 @@ gst_dp_packet_from_event (const GstEvent * event, GstDPHeaderFlag flags,
}
/* version, flags, type */
h[0] = (guint8) GST_DP_VERSION_MAJOR;
h[1] = (guint8) GST_DP_VERSION_MINOR;
h[2] = (guint8) flags;
h[3] = 0; /* padding byte */
GST_WRITE_UINT16_BE (h + 4,
GST_DP_INIT_HEADER (h, GST_DP_VERSION_MAJOR, GST_DP_VERSION_MINOR, flags,
GST_DP_PAYLOAD_EVENT_NONE + GST_EVENT_TYPE (event));
/* length */
@ -389,10 +387,6 @@ gst_dp_packet_from_event (const GstEvent * event, GstDPHeaderFlag flags,
/* timestamp */
GST_WRITE_UINT64_BE (h + 10, GST_EVENT_TIMESTAMP (event));
/* ABI padding */
GST_WRITE_UINT64_BE (h + 42, (guint64) 0);
GST_WRITE_UINT64_BE (h + 50, (guint64) 0);
/* CRC */
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_HEADER) {
@ -413,7 +407,6 @@ gst_dp_packet_from_event (const GstEvent * event, GstDPHeaderFlag flags,
return TRUE;
}
/**
* gst_dp_buffer_from_header:
* @header_length: the length of the packet header