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clean up libs docs; add dataprotocol

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Original commit message from CVS:
clean up libs docs; add dataprotocol
This commit is contained in:
Thomas Vander Stichele 2004-05-19 16:37:53 +00:00
parent 182b3195cd
commit 5e2fb3d072
11 changed files with 1315 additions and 71 deletions
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23
ChangeLog
View file

@ -1,3 +1,26 @@
2004-05-19 Thomas Vander Stichele <thomas at apestaart dot org>
* docs/libs/gstreamer-libs-docs.sgml:
* docs/libs/gstreamer-libs-sections.txt:
remove idct and putbits
* configure.ac:
* docs/libs/tmpl/gstdataprotocol.sgml:
* libs/gst/Makefile.am:
* libs/gst/dataprotocol/Makefile.am:
* libs/gst/dataprotocol/dataprotocol-test.c: (conversion_test),
(buffer_test), (caps_test), (event_test), (main):
* libs/gst/dataprotocol/dataprotocol.c: (gst_dp_crc),
(gst_dp_dump_byte_array), (gst_dp_init),
(gst_dp_header_payload_length), (gst_dp_header_payload_type),
(gst_dp_header_from_buffer), (gst_dp_packet_from_caps),
(gst_dp_packet_from_event), (gst_dp_buffer_from_header),
(gst_dp_caps_from_packet), (gst_dp_event_from_packet),
(gst_dp_validate_header), (gst_dp_validate_payload),
(gst_dp_validate_packet), (plugin_init):
* libs/gst/dataprotocol/dataprotocol.h:
* libs/gst/dataprotocol/dp-private.h:
add dataprotocol
2004-05-19 Benjamin Otte <in7y118@public.uni-hamburg.de>
* gst/gstvalue.c: (gst_value_deserialize_int_helper):

1
configure.ac
View file

@ -644,6 +644,7 @@ libs/Makefile
libs/gst/Makefile
libs/gst/bytestream/Makefile
libs/gst/control/Makefile
libs/gst/dataprotocol/Makefile
libs/gst/getbits/Makefile
po/Makefile.in
tests/Makefile

6
docs/libs/gstreamer-libs-docs.sgml
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@ -4,9 +4,8 @@
<!ENTITY % version-entities SYSTEM "../version.entities">
%version-entities;
<!ENTITY GstGetbits SYSTEM "xml/gstgetbits.xml">
<!ENTITY GstPutbits SYSTEM "xml/gstputbits.xml">
<!ENTITY GstControl SYSTEM "xml/gstcontrol.xml">
<!ENTITY GstIDCT SYSTEM "xml/gstidct.xml">
<!ENTITY GstDataProtocol SYSTEM "xml/gstdataprotocol.xml">
]>
@ -26,9 +25,8 @@
GStreamer provides some standard libraries you can use to create plugins.
</para>
&GstGetbits;
&GstPutbits;
&GstIDCT;
&GstControl;
&GstDataProtocol;
</chapter>

83
docs/libs/gstreamer-libs-sections.txt
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@ -79,71 +79,26 @@ DEBUG
</SECTION>
<SECTION>
<FILE>gstputbits</FILE>
<INCLUDE>libs/putbits/gstputbits.h</INCLUDE>
gst_putbits_t
gst_putbits_init
gst_putbits_new_empty_buffer
gst_putbits_new_buffer
gst_putbits_align
gst_putbits_bitcount
gst_putbits1
gst_putbits2
gst_putbits3
gst_putbits4
gst_putbits5
gst_putbits6
gst_putbits7
gst_putbits8
gst_putbits9
gst_putbits10
gst_putbits11
gst_putbits12
gst_putbits13
gst_putbits14
gst_putbits15
gst_putbits16
gst_putbits17
gst_putbits18
gst_putbits19
gst_putbits20
gst_putbits21
gst_putbits22
gst_putbits32
gst_putbitsn
<FILE>gstdataprotocol</FILE>
<INCLUDE>libs/dataprotocol/dataprotocol.h</INCLUDE>
GstDPHeaderFlag
GstDPPayloadType
gst_dp_header_payload_length
gst_dp_header_payload_type
gst_dp_header_from_buffer
gst_dp_packet_from_caps
gst_dp_packet_from_event
gst_dp_buffer_from_header
gst_dp_caps_from_packet
gst_dp_event_from_packet
gst_dp_validate_header
gst_dp_validate_payload
gst_dp_validate_packet
<SUBSECTION Standard>
gst_putbits
</SECTION>
<SECTION>
<FILE>dct</FILE>
DCTSIZE
DCTSIZE2
EIGHT_BIT_SAMPLES
DCTELEM
DCTBLOCK[DCTSIZE2]
INT32
gst_idct_int_idct
gst_idct_init_fast_int_idct
gst_idct_init_float_idct
gst_idct_fast_int_idct
gst_idct_mmx_idct
gst_idct_mmx32_idct
gst_idct_sse_idct
gst_idct_float_idct
</SECTION>
<SECTION>
<FILE>gstidct</FILE>
<INCLUDE>libs/idct/gstidct.h</INCLUDE>
GstIDCTMethod
GstIDCT
GstIDCTFunction
GST_IDCT_TRANSPOSE
gst_idct_new
gst_idct_convert
gst_idct_convert_sparse
gst_idct_destroy
</SECTION>
<SECTION>

156
docs/libs/tmpl/gstdataprotocol.sgml Normal file
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@ -0,0 +1,156 @@
<!-- ##### SECTION Title ##### -->
gstdataprotocol
<!-- ##### SECTION Short_Description ##### -->
<!-- ##### SECTION Long_Description ##### -->
<para>
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
</para>
<!-- ##### ENUM GstDPHeaderFlag ##### -->
<para>
</para>
@GST_DP_HEADER_FLAG_NONE:
@GST_DP_HEADER_FLAG_CRC_HEADER:
@GST_DP_HEADER_FLAG_CRC_PAYLOAD:
@GST_DP_HEADER_FLAG_CRC:
<!-- ##### ENUM GstDPPayloadType ##### -->
<para>
</para>
@GST_DP_PAYLOAD_NONE:
@GST_DP_PAYLOAD_BUFFER:
@GST_DP_PAYLOAD_CAPS:
@GST_DP_PAYLOAD_EVENT_NONE:
<!-- ##### FUNCTION gst_dp_header_payload_length ##### -->
<para>
</para>
@header:
@Returns:
<!-- ##### FUNCTION gst_dp_header_payload_type ##### -->
<para>
</para>
@header:
@Returns:
<!-- ##### FUNCTION gst_dp_header_from_buffer ##### -->
<para>
</para>
@buffer:
@flags:
@length:
@header:
@Returns:
<!-- ##### FUNCTION gst_dp_packet_from_caps ##### -->
<para>
</para>
@caps:
@flags:
@length:
@header:
@payload:
@Returns:
<!-- ##### FUNCTION gst_dp_packet_from_event ##### -->
<para>
</para>
@event:
@flags:
@length:
@header:
@payload:
@Returns:
<!-- ##### FUNCTION gst_dp_buffer_from_header ##### -->
<para>
</para>
@header_length:
@header:
@Returns:
<!-- ##### FUNCTION gst_dp_caps_from_packet ##### -->
<para>
</para>
@header_length:
@header:
@payload:
@Returns:
<!-- ##### FUNCTION gst_dp_event_from_packet ##### -->
<para>
</para>
@header_length:
@header:
@payload:
@Returns:
<!-- ##### FUNCTION gst_dp_validate_header ##### -->
<para>
</para>
@header_length:
@header:
@Returns:
<!-- ##### FUNCTION gst_dp_validate_payload ##### -->
<para>
</para>
@header_length:
@header:
@payload:
@Returns:
<!-- ##### FUNCTION gst_dp_validate_packet ##### -->
<para>
</para>
@header_length:
@header:
@payload:
@Returns:

4
libs/gst/Makefile.am
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@ -1,3 +1 @@
SUBDIRS = bytestream control getbits
DIST_SUBDIRS = bytestream control getbits
SUBDIRS = bytestream control dataprotocol getbits

31
libs/gst/dataprotocol/Makefile.am Normal file
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@ -0,0 +1,31 @@
lib_LTLIBRARIES = libgstdataprotocol.la
AS_LIBTOOL_LIB = libgstdataprotocol
EXTRA_DIST = $(as_libtool_EXTRA_DIST)
noinst_DATA = $(as_libtool_noinst_DATA_files)
libgstdataprotocol_includedir = $(includedir)/gstreamer-@GST_MAJORMINOR@/gst/dataprotocol
libgstdataprotocol_include_HEADERS = \
dataprotocol.h
noinst_HEADERS = dp-private.h
libgstdataprotocol_la_SOURCES = \
dataprotocol.c
libgstdataprotocol_la_CFLAGS = $(GST_OBJ_CFLAGS) -I$(top_srcdir)/libs
libgstdataprotocol_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) $(as_libtool_LDFLAGS)
libgstdataprotocol_la_LIBADD = $(GST_OBJ_LIBS)
install-data-local: as-libtool-install-data-local
uninstall-local: as-libtool-uninstall-local
include $(top_srcdir)/common/as-libtool.mak
# regression test
check_PROGRAMS = dataprotocol-test
dataprotocol_test_SOURCES = dataprotocol-test.c dataprotocol.c
dataprotocol_test_CFLAGS = $(GST_LIB_CFLAGS) -I$(top_srcdir)/libs
dataprotocol_test_LDADD = $(GST_LIB_LIBS)

300
libs/gst/dataprotocol/dataprotocol-test.c Normal file
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@ -0,0 +1,300 @@
/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
*
* dataprotocol-test.c: Test functions for GStreamer Data Protocol
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <gst/gst.h>
#include <gst/dataprotocol/dataprotocol.h>
#include "dp-private.h"
#include <string.h> /* memcmp */
/* test our method of reading and writing headers using TO/FROM_BE */
static int
conversion_test ()
{
guint8 array[9];
guint8 write_array[9];
guint16 read_two, expect_two;
guint32 read_four, expect_four;
guint64 read_eight, expect_eight;
int i;
for (i = 0; i < 9; ++i) {
array[i] = i * 0x10;
}
/* read 8 16 bits */
for (i = 0; i < 8; ++i) {
read_two = GUINT16_FROM_BE (*((guint16 *) (array + i)));
expect_two = array[i] * (1 << 8) + array[i + 1];
if (read_two != expect_two) {
g_print ("GUINT16_FROM_BE %d: read %d != %d\n", i, read_two, expect_two);
return -1;
}
}
/* write 8 16 bit */
for (i = 0; i < 8; ++i) {
*((guint16 *) & write_array[i]) = GUINT16_TO_BE (read_two);
if (memcmp (array + 7, write_array + i, 2) != 0) {
gst_dp_dump_byte_array (write_array + i, 2);
gst_dp_dump_byte_array (array + 7, 2);
return -1;
}
}
/* read 5 32 bits */
for (i = 0; i < 5; ++i) {
read_four = GUINT32_FROM_BE (*((guint32 *) (array + i)));
expect_four = array[i] * (1 << 24) + array[i + 1] * (1 << 16)
+ array[i + 2] * (1 << 8) + array[i + 3];
if (read_four != expect_four) {
g_print ("GUINT32_FROM_BE %d: read %d != %d\n", i, read_four,
expect_four);
return -1;
}
}
/* read 2 64 bits */
for (i = 0; i < 2; ++i) {
read_eight = GUINT64_FROM_BE (*((guint64 *) (array + i)));
expect_eight = array[i] * (1LL << 56) + array[i + 1] * (1LL << 48)
+ array[i + 2] * (1LL << 40) + array[i + 3] * (1LL << 32)
+ array[i + 4] * (1 << 24) + array[i + 5] * (1 << 16)
+ array[i + 6] * (1 << 8) + array[i + 7];
;
if (read_eight != expect_eight) {
g_print ("GUINT64_FROM_BE %d: read %" G_GUINT64_FORMAT
" != %" G_GUINT64_FORMAT "\n", i, read_eight, expect_eight);
return -1;
}
}
/* write 1 64 bit */
*((guint64 *) & write_array[0]) = GUINT64_TO_BE (read_eight);
if (memcmp (array + 1, write_array, 8) != 0) {
gst_dp_dump_byte_array (write_array, 8);
gst_dp_dump_byte_array (array + 1, 8);
return -1;
}
return 0;
}
/* test creation of header from buffer and back again */
static int
buffer_test ()
{
GstBuffer *buffer;
GstBuffer *newbuffer;
guint header_length;
guint8 *header;
/* create buffer */
g_print ("Creating a new 8-byte buffer with ts 0.5 sec, dur 1 sec\n");
buffer = gst_buffer_new_and_alloc (8);
GST_BUFFER_TIMESTAMP (buffer) = (GstClockTime) (GST_SECOND * 0.5);
GST_BUFFER_DURATION (buffer) = (GstClockTime) GST_SECOND;
GST_BUFFER_OFFSET (buffer) = (guint64) 10;
GST_BUFFER_OFFSET_END (buffer) = (guint64) 19;
memmove (GST_BUFFER_DATA (buffer), "a buffer", 8);
/* create a buffer with CRC checking */
if (!gst_dp_header_from_buffer (buffer, GST_DP_HEADER_FLAG_CRC,
&header_length, &header)) {
g_print ("Could not create header from buffer.");
exit (1);
}
/* validate the header */
g_return_val_if_fail (gst_dp_validate_header (header_length, header), -1);
/* create a new, empty buffer with the right size */
newbuffer = gst_dp_buffer_from_header (header_length, header);
/* read/copy the data */
memmove (GST_BUFFER_DATA (newbuffer), GST_BUFFER_DATA (buffer),
GST_BUFFER_SIZE (buffer));
/* validate the buffer */
g_return_val_if_fail (gst_dp_validate_payload (header_length, header,
GST_BUFFER_DATA (newbuffer)), -1);
g_return_val_if_fail (newbuffer, -1);
g_return_val_if_fail (GST_IS_BUFFER (newbuffer), -1);
g_print ("new buffer timestamp: %" GST_TIME_FORMAT "\n",
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (newbuffer)));
g_print ("new buffer duration: %" GST_TIME_FORMAT "\n",
GST_TIME_ARGS (GST_BUFFER_DURATION (newbuffer)));
g_print ("new buffer offset: %" G_GUINT64_FORMAT "\n",
GST_BUFFER_OFFSET (newbuffer));
g_print ("new buffer offset_end: %" G_GUINT64_FORMAT "\n",
GST_BUFFER_OFFSET_END (newbuffer));
if (GST_BUFFER_TIMESTAMP (newbuffer) != GST_BUFFER_TIMESTAMP (buffer)) {
g_error ("Timestamps don't match !");
}
if (GST_BUFFER_DURATION (newbuffer) != GST_BUFFER_DURATION (buffer)) {
g_error ("Durations don't match !");
}
if (GST_BUFFER_OFFSET (newbuffer) != GST_BUFFER_OFFSET (buffer)) {
g_error ("Offsets don't match !");
}
if (GST_BUFFER_OFFSET_END (newbuffer) != GST_BUFFER_OFFSET_END (buffer)) {
g_error ("Offset ends don't match !");
}
g_free (header);
return 0;
}
static int
caps_test ()
{
gchar *string, *newstring;
GstCaps *caps, *newcaps;
guint header_length;
guint8 *header, *payload;
caps = gst_caps_from_string ("audio/x-raw-float, "
"rate = (int) [ 11025, 48000 ], "
"channels = (int) [ 1, 2 ], " "endianness = (int) BYTE_ORDER, "
"width = (int) 32, " "buffer-frames = (int) 0");
string = gst_caps_to_string (caps);
g_print ("Created caps: %s\n", string);
//g_assert (GST_IS_CAPS (caps));
if (!gst_dp_packet_from_caps (caps, 0, &header_length, &header, &payload)) {
g_print ("Could not create packet from caps.");
exit (1);
}
/* validate the packet */
g_return_val_if_fail (gst_dp_validate_packet (header_length, header, payload),
FALSE);
newcaps = gst_dp_caps_from_packet (header_length, header, payload);
g_return_val_if_fail (newcaps, -1);
//g_return_val_if_fail (GST_IS_CAPS (newcaps), -1);
newstring = gst_caps_to_string (newcaps);
g_print ("Received caps: %s\n", newstring);
if (strcmp (string, newstring) != 0)
return -1;
g_free (string);
g_free (newstring);
return 0;
}
static int
event_test ()
{
GstEvent *send;
GstEvent *receive;
guint header_length;
guint8 *header, *payload;
g_print ("Testing EOS event at 1s\n");
send = gst_event_new (GST_EVENT_EOS);
GST_EVENT_TIMESTAMP (send) = GST_SECOND;
if (!gst_dp_packet_from_event (send, GST_DP_HEADER_FLAG_CRC, &header_length,
&header, &payload)) {
g_warning ("Could not create packet from eos event");
return 1;
}
receive = gst_dp_event_from_packet (header_length, header, payload);
g_print ("EOS, timestamp %" GST_TIME_FORMAT "\n",
GST_TIME_ARGS (GST_EVENT_TIMESTAMP (receive)));
g_assert (GST_EVENT_TYPE (receive) == GST_EVENT_EOS);
g_assert (GST_EVENT_TIMESTAMP (receive) == GST_SECOND);
gst_event_unref (send);
gst_event_unref (receive);
g_print ("Testing FLUSH event at 2s\n");
send = gst_event_new (GST_EVENT_FLUSH);
GST_EVENT_TIMESTAMP (send) = GST_SECOND * 2;
if (!gst_dp_packet_from_event (send, GST_DP_HEADER_FLAG_CRC, &header_length,
&header, &payload)) {
g_warning ("Could not create packet from flush event");
return 1;
}
receive = gst_dp_event_from_packet (header_length, header, payload);
g_print ("Flush, timestamp %" GST_TIME_FORMAT "\n",
GST_TIME_ARGS (GST_EVENT_TIMESTAMP (receive)));
g_assert (GST_EVENT_TYPE (receive) == GST_EVENT_FLUSH);
g_assert (GST_EVENT_TIMESTAMP (receive) == GST_SECOND * 2);
gst_event_unref (send);
gst_event_unref (receive);
g_print ("Testing SEEK event with 1 second at 3 seconds\n");
send = gst_event_new_seek (GST_FORMAT_TIME, GST_SECOND);
GST_EVENT_TIMESTAMP (send) = GST_SECOND * 3;
if (!gst_dp_packet_from_event (send, GST_DP_HEADER_FLAG_CRC, &header_length,
&header, &payload)) {
g_warning ("Could not create packet from seek event");
return 1;
}
receive = gst_dp_event_from_packet (header_length, header, payload);
g_print ("Seek, timestamp %" GST_TIME_FORMAT ", to %" GST_TIME_FORMAT "\n",
GST_TIME_ARGS (GST_EVENT_TIMESTAMP (receive)),
GST_TIME_ARGS (GST_EVENT_SEEK_OFFSET (receive)));
g_assert (GST_EVENT_TYPE (receive) == GST_EVENT_SEEK);
g_assert (GST_EVENT_TIMESTAMP (receive) == GST_SECOND * 3);
g_assert (GST_EVENT_SEEK_FORMAT (receive) == GST_FORMAT_TIME);
g_assert (GST_EVENT_SEEK_OFFSET (receive) == GST_SECOND);
gst_event_unref (send);
gst_event_unref (receive);
return 0;
}
int
main (int argc, char *argv[])
{
int ret;
gst_init (&argc, &argv);
gst_dp_init ();
g_print ("\nconversion test\n\n");
ret = conversion_test ();
if (ret != 0)
return ret;
g_print ("\nbuffer test\n\n");
ret = buffer_test ();
if (ret != 0)
return ret;
g_print ("\ncaps test\n\n");
ret = caps_test ();
if (ret != 0)
return ret;
g_print ("\nevent test\n\n");
ret = event_test ();
if (ret != 0)
return ret;
g_print ("\nall tests worked.\n\n");
return 0;
}

625
libs/gst/dataprotocol/dataprotocol.c Normal file
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@ -0,0 +1,625 @@
/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
*
* dataprotocol.c: Functions implementing the GStreamer Data Protocol
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/dataprotocol/dataprotocol.h>
#include <glib/gprintf.h> /* g_sprintf */
#include <string.h> /* strlen */
#include "dp-private.h"
/* debug category */
GST_DEBUG_CATEGORY (data_protocol_debug);
#define GST_CAT_DEFAULT data_protocol_debug
/*** private functions ***/
#define GST_DP_WRITE_GUINT64(buf, value) (*((guint64 *) (buf)) = GUINT64_TO_BE (value))
#define GST_DP_WRITE_GUINT32(buf, value) (*((guint32 *) (buf)) = GUINT32_TO_BE (value))
#define GST_DP_WRITE_GUINT16(buf, value) (*((guint16 *) (buf)) = GUINT16_TO_BE (value))
/* calculate a CCITT 16 bit CRC check value for a given byte array */
/*
* this code snippet is adapted from a web page I found
* it is identical except for cleanups, and a final XOR with 0xffff
* as outlined in the uecp spec
*
* XMODEM x^16 + x^12 + x^5 + 1
*/
#define POLY 0x1021
#define CRC_INIT 0xFFFF
static guint16
gst_dp_crc (const guint8 * buffer, register guint length)
{
static gboolean initialized = FALSE;
static guint16 crc_register, crc_table[256];
unsigned long i, j, k;
if (!initialized) {
for (i = 0; i < 256; i++) {
j = i << 8;
for (k = 8; k--;) {
j = j & 0x8000 ? (j << 1) ^ POLY : j << 1;
}
crc_table[i] = (guint16) j;
}
initialized = TRUE;
}
crc_register = CRC_INIT; /* always init register */
/* calc CRC */
for (; length--;) {
crc_register = (guint16) ((crc_register << 8) ^
crc_table[((crc_register >> 8) & 0x00ff) ^ *buffer++]);
}
return (0xffff ^ crc_register);
}
/* debugging function; dumps byte array values per 8 bytes */
/* FIXME: would be nice to merge this with gst_util_dump_mem () */
void
gst_dp_dump_byte_array (guint8 * array, guint length)
{
int i;
int n = 8; /* number of bytes per line */
gchar *line = g_malloc (3 * n);
GST_LOG ("dumping byte array of length %d", length);
for (i = 0; i < length; ++i) {
g_sprintf (line + 3 * (i % n), "%02x ", array[i]);
if (i % n == (n - 1)) {
GST_LOG ("%03d: %s", i - (n - 1), line);
}
}
if (i % n != 0) {
GST_LOG ("%03d: %s", (i / n) * n, line);
}
g_free (line);
}
/**
* gst_dp_init:
*
* Initialize GStreamer Data Protocol library.
*
* Should be called before using these functions; either from source linking
* to this source file or from plugin_init.
*/
void
gst_dp_init (void)
{
static gboolean _gst_dp_initialized = FALSE;
if (_gst_dp_initialized)
return;
_gst_dp_initialized = TRUE;
GST_DEBUG_CATEGORY_INIT (data_protocol_debug, "gdp", 0,
"GStreamer Data Protocol");
}
/*** PUBLIC FUNCTIONS ***/
/**
* gst_dp_header_payload_length:
* @header: the byte header of the packet array
*
* Returns: the length of the payload this header describes.
*/
guint32
gst_dp_header_payload_length (const guint8 * header)
{
return GST_DP_HEADER_PAYLOAD_LENGTH (header);
}
/**
* gst_dp_header_payload_type:
* @header: the byte header of the packet array
*
* Returns: the #GstDPPayloadType the payload this header describes.
*/
GstDPPayloadType
gst_dp_header_payload_type (const guint8 * header)
{
return GST_DP_HEADER_PAYLOAD_TYPE (header);
}
/**
* gst_dp_header_from_buffer:
* @buffer: a #GstBuffer to create a header for
* @flags: the #GDPHeaderFlags to create the header with
* @length: a guint pointer to store the header length in
* @header: a guint8 * pointer to store a newly allocated header byte array in
*
* Creates a GDP header from the given buffer.
*
* Returns: %TRUE if the header was successfully created
*/
gboolean
gst_dp_header_from_buffer (const GstBuffer * buffer, GstDPHeaderFlag flags,
guint * length, guint8 ** header)
{
guint8 *h;
guint16 crc;
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
g_return_val_if_fail (GST_BUFFER_REFCOUNT_VALUE (buffer) > 0, FALSE);
*length = GST_DP_HEADER_LENGTH;
h = g_malloc (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] = GST_DP_PAYLOAD_BUFFER;
/* buffer properties */
GST_DP_WRITE_GUINT32 (h + 4, GST_BUFFER_SIZE (buffer));
GST_DP_WRITE_GUINT64 (h + 8, GST_BUFFER_TIMESTAMP (buffer));
GST_DP_WRITE_GUINT64 (h + 16, GST_BUFFER_DURATION (buffer));
GST_DP_WRITE_GUINT64 (h + 24, GST_BUFFER_OFFSET (buffer));
GST_DP_WRITE_GUINT64 (h + 32, GST_BUFFER_OFFSET_END (buffer));
/* ABI padding */
GST_DP_WRITE_GUINT64 (h + 40, (guint64) 0);
GST_DP_WRITE_GUINT64 (h + 48, (guint64) 0);
/* CRC */
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_HEADER) {
/* we don't crc the last four bytes of the header since they are crc's */
crc = gst_dp_crc (h, 56);
}
GST_DP_WRITE_GUINT16 (h + 56, crc);
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_PAYLOAD) {
crc = gst_dp_crc (GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer));
}
GST_DP_WRITE_GUINT16 (h + 58, crc);
GST_LOG ("created header from buffer:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
*header = h;
return TRUE;
}
/**
* gst_dp_packet_from_caps:
* @caps: a #GstCaps to create a packet for
* @flags: the #GDPHeaderFlags to create the header with
* @length: a guint pointer to store the header length in
* @header: a guint8 pointer to store a newly allocated header byte array in
* @payload: a guint8 pointer to store a newly allocated payload byte array in
*
* Creates a GDP packet from the given caps.
*
* Returns: %TRUE if the packet was successfully created
*/
gboolean
gst_dp_packet_from_caps (const GstCaps * caps, GstDPHeaderFlag flags,
guint * length, guint8 ** header, guint8 ** payload)
{
guint8 *h;
guint16 crc;
gchar *string;
/* FIXME: GST_IS_CAPS doesn't work
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE); */
*length = GST_DP_HEADER_LENGTH;
h = g_malloc (GST_DP_HEADER_LENGTH);
string = 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] = GST_DP_PAYLOAD_CAPS;
/* buffer properties */
GST_DP_WRITE_GUINT32 (h + 4, strlen (string) + 1); /* include trailing 0 */
GST_DP_WRITE_GUINT64 (h + 8, (guint64) 0);
GST_DP_WRITE_GUINT64 (h + 16, (guint64) 0);
GST_DP_WRITE_GUINT64 (h + 24, (guint64) 0);
GST_DP_WRITE_GUINT64 (h + 32, (guint64) 0);
/* ABI padding */
GST_DP_WRITE_GUINT64 (h + 40, (guint64) 0);
GST_DP_WRITE_GUINT64 (h + 48, (guint64) 0);
/* CRC */
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_HEADER) {
crc = gst_dp_crc (h, 56);
}
GST_DP_WRITE_GUINT16 (h + 56, crc);
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_PAYLOAD) {
crc = gst_dp_crc (string, strlen (string) + 1);
}
GST_DP_WRITE_GUINT16 (h + 58, crc);
GST_LOG ("created header from caps:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
*header = h;
*payload = string;
return TRUE;
}
/**
* gst_dp_packet_from_event:
* @event: a #GstEvent to create a packet for
* @flags: the #GDPHeaderFlags to create the header with
* @length: a guint pointer to store the header length in
* @header: a guint8 pointer to store a newly allocated header byte array in
* @payload: a guint8 pointer to store a newly allocated payload byte array in
*
* Creates a GDP packet from the given event.
*
* Returns: %TRUE if the packet was successfully created
*/
gboolean
gst_dp_packet_from_event (const GstEvent * event, GstDPHeaderFlag flags,
guint * length, guint8 ** header, guint8 ** payload)
{
guint8 *h;
guint16 crc;
gchar *string = NULL;
guint pl_length; /* length of payload */
g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
*length = GST_DP_HEADER_LENGTH;
h = g_malloc0 (GST_DP_HEADER_LENGTH);
/* first construct payload, since we need the length */
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_UNKNOWN:
g_warning ("Unknown event, ignoring");
*length = 0;
g_free (h);
return FALSE;
case GST_EVENT_EOS:
case GST_EVENT_FLUSH:
case GST_EVENT_EMPTY:
case GST_EVENT_DISCONTINUOUS:
GST_DP_WRITE_GUINT64 (h + 8, GST_EVENT_TIMESTAMP (event));
pl_length = 0;
*payload = NULL;
break;
case GST_EVENT_SEEK:
pl_length = 4 + 8 + 4;
*payload = g_malloc0 (pl_length);
GST_DP_WRITE_GUINT32 (*payload, (guint32) GST_EVENT_SEEK_TYPE (event));
GST_DP_WRITE_GUINT64 (*payload + 4,
(guint64) GST_EVENT_SEEK_OFFSET (event));
GST_DP_WRITE_GUINT32 (*payload + 12,
(guint32) GST_EVENT_SEEK_ACCURACY (event));
break;
case GST_EVENT_SEEK_SEGMENT:
pl_length = 4 + 8 + 8 + 4;
*payload = g_malloc0 (pl_length);
GST_DP_WRITE_GUINT32 (*payload, (guint32) GST_EVENT_SEEK_TYPE (event));
GST_DP_WRITE_GUINT64 (*payload + 4,
(guint64) GST_EVENT_SEEK_OFFSET (event));
GST_DP_WRITE_GUINT64 (*payload + 12,
(guint64) GST_EVENT_SEEK_ENDOFFSET (event));
GST_DP_WRITE_GUINT32 (*payload + 20,
(guint32) GST_EVENT_SEEK_ACCURACY (event));
break;
case GST_EVENT_QOS:
case GST_EVENT_SEGMENT_DONE:
case GST_EVENT_SIZE:
case GST_EVENT_RATE:
case GST_EVENT_FILLER:
case GST_EVENT_TS_OFFSET:
case GST_EVENT_INTERRUPT:
case GST_EVENT_NAVIGATION:
case GST_EVENT_TAG:
g_warning ("Unhandled event type %d, ignoring", GST_EVENT_TYPE (event));
return FALSE;
default:
g_warning ("Unknown event type %d, ignoring", GST_EVENT_TYPE (event));
*length = 0;
g_free (h);
return FALSE;
}
/* version, flags, type */
h[0] = (guint8) GST_DP_VERSION_MAJOR;
h[1] = (guint8) GST_DP_VERSION_MINOR;
h[2] = (guint8) flags;
h[3] = GST_DP_PAYLOAD_EVENT_NONE + GST_EVENT_TYPE (event);
/* length */
GST_DP_WRITE_GUINT32 (h + 4, (guint32) pl_length);
/* timestamp */
GST_DP_WRITE_GUINT64 (h + 8, GST_EVENT_TIMESTAMP (event));
/* ABI padding */
GST_DP_WRITE_GUINT64 (h + 40, (guint64) 0);
GST_DP_WRITE_GUINT64 (h + 48, (guint64) 0);
/* CRC */
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_HEADER) {
crc = gst_dp_crc (h, 56);
}
GST_DP_WRITE_GUINT16 (h + 56, crc);
crc = 0;
if (flags & GST_DP_HEADER_FLAG_CRC_PAYLOAD) {
crc = gst_dp_crc (string, strlen (string) + 1);
}
GST_DP_WRITE_GUINT16 (h + 58, crc);
GST_LOG ("created header from event:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
*header = h;
return TRUE;
}
/**
* gst_dp_buffer_from_header:
* @header_length: the length of the packet header
* @header: the byte array of the packet header
*
* Creates a newly allocated #GstBuffer from the given header.
* The buffer data needs to be copied into it before validating.
*
* Use this function if you want to pre-allocate a buffer based on the
* packet header to read the packet payload in to.
*
* Returns: %TRUE if the buffer was successfully created
*/
GstBuffer *
gst_dp_buffer_from_header (guint header_length, const guint8 * header)
{
GstBuffer *buffer;
g_return_val_if_fail (GST_DP_HEADER_PAYLOAD_TYPE (header) ==
GST_DP_PAYLOAD_BUFFER, FALSE);
buffer =
gst_buffer_new_and_alloc ((guint) GST_DP_HEADER_PAYLOAD_LENGTH (header));
GST_BUFFER_TIMESTAMP (buffer) = GST_DP_HEADER_TIMESTAMP (header);
GST_BUFFER_DURATION (buffer) = GST_DP_HEADER_DURATION (header);
GST_BUFFER_OFFSET (buffer) = GST_DP_HEADER_OFFSET (header);
GST_BUFFER_OFFSET_END (buffer) = GST_DP_HEADER_OFFSET_END (header);
return buffer;
}
/**
* gst_dp_caps_from_packet:
* @header_length: the length of the packet header
* @header: the byte array of the packet header
* @payload: the byte array of the packet payload
*
* Creates a newly allocated #GstCaps from the given packet.
*
* Returns: %TRUE if the caps was successfully created
*/
GstCaps *
gst_dp_caps_from_packet (guint header_length, const guint8 * header,
const guint8 * payload)
{
GstCaps *caps;
const gchar *string;
g_return_val_if_fail (header, FALSE);
g_return_val_if_fail (payload, FALSE);
g_return_val_if_fail (GST_DP_HEADER_PAYLOAD_TYPE (header) ==
GST_DP_PAYLOAD_CAPS, FALSE);
string = payload;
caps = gst_caps_from_string (string);
return caps;
}
/**
* gst_dp_event_from_packet:
* @header_length: the length of the packet header
* @header: the byte array of the packet header
* @payload: the byte array of the packet payload
*
* Creates a newly allocated #GstEvent from the given packet.
*
* Returns: %TRUE if the event was successfully created
*/
GstEvent *
gst_dp_event_from_packet (guint header_length, const guint8 * header,
const guint8 * payload)
{
GstEvent *event = NULL;
GstEventType type;
g_return_val_if_fail (header, FALSE);
/* payload can be NULL, e.g. for an EOS event */
type = GST_DP_HEADER_PAYLOAD_TYPE (header) - GST_DP_PAYLOAD_EVENT_NONE;
switch (type) {
case GST_EVENT_UNKNOWN:
g_warning ("Unknown event, ignoring");
return FALSE;
case GST_EVENT_EOS:
case GST_EVENT_FLUSH:
case GST_EVENT_EMPTY:
case GST_EVENT_DISCONTINUOUS:
event = gst_event_new (type);
GST_EVENT_TIMESTAMP (event) = GST_DP_HEADER_TIMESTAMP (header);
break;
case GST_EVENT_SEEK:
{
GstSeekType type;
gint64 offset;
GstSeekAccuracy accuracy;
type = (GstSeekType) GST_DP_GUINT32 (payload);
offset = (gint64) GST_DP_GUINT64 (payload + 4);
accuracy = (GstSeekAccuracy) GST_DP_GUINT32 (payload + 12);
event = gst_event_new_seek (type, offset);
GST_EVENT_TIMESTAMP (event) = GST_DP_HEADER_TIMESTAMP (header);
GST_EVENT_SEEK_ACCURACY (event) = accuracy;
break;
}
case GST_EVENT_SEEK_SEGMENT:
{
GstSeekType type;
gint64 offset, endoffset;
GstSeekAccuracy accuracy;
type = (GstSeekType) GST_DP_GUINT32 (payload);
offset = (gint64) GST_DP_GUINT64 (payload + 4);
endoffset = (gint64) GST_DP_GUINT64 (payload + 12);
accuracy = (GstSeekAccuracy) GST_DP_GUINT32 (payload + 20);
event = gst_event_new_segment_seek (type, offset, endoffset);
GST_EVENT_TIMESTAMP (event) = GST_DP_HEADER_TIMESTAMP (header);
GST_EVENT_SEEK_ACCURACY (event) = accuracy;
break;
}
case GST_EVENT_QOS:
case GST_EVENT_SEGMENT_DONE:
case GST_EVENT_SIZE:
case GST_EVENT_RATE:
case GST_EVENT_FILLER:
case GST_EVENT_TS_OFFSET:
case GST_EVENT_INTERRUPT:
case GST_EVENT_NAVIGATION:
case GST_EVENT_TAG:
g_warning ("Unhandled event type %d, ignoring", GST_EVENT_TYPE (event));
return FALSE;
default:
g_warning ("Unknown event type %d, ignoring", GST_EVENT_TYPE (event));
return FALSE;
}
return event;
}
/**
* gst_dp_validate_header:
* @header_length: the length of the packet header
* @header: the byte array of the packet header
*
* Validates the given packet header by checking the CRC checksum.
*
* Returns: %TRUE if the CRC matches, or no CRC checksum is present
*/
gboolean
gst_dp_validate_header (guint header_length, const guint8 * header)
{
guint16 crc_read, crc_calculated;
if (!(GST_DP_HEADER_FLAGS (header) & GST_DP_HEADER_FLAG_CRC_HEADER))
return TRUE;
crc_read = GST_DP_HEADER_CRC_HEADER (header);
/* don't included the last two crc fields for the crc check */
crc_calculated = gst_dp_crc (header, header_length - 4);
if (crc_read != crc_calculated) {
GST_WARNING ("header crc mismatch: read %02x, calculated %02x", crc_read,
crc_calculated);
return FALSE;
}
GST_LOG ("header crc validation: %02x", crc_read);
return TRUE;
}
/**
* gst_dp_validate_payload:
* @header_length: the length of the packet header
* @header: the byte array of the packet header
* @payload: the byte array of the packet payload
*
* Validates the given packet payload using the given packet header
* by checking the CRC checksum.
*
* Returns: %TRUE if the CRC matches, or no CRC checksum is present
*/
gboolean
gst_dp_validate_payload (guint header_length, const guint8 * header,
const guint8 * payload)
{
guint16 crc_read, crc_calculated;
if (!(GST_DP_HEADER_FLAGS (header) & GST_DP_HEADER_FLAG_CRC_PAYLOAD))
return TRUE;
crc_read = GST_DP_HEADER_CRC_PAYLOAD (header);
crc_calculated = gst_dp_crc (payload, GST_DP_HEADER_PAYLOAD_LENGTH (header));
if (crc_read != crc_calculated) {
GST_WARNING ("payload crc mismatch: read %02x, calculated %02x", crc_read,
crc_calculated);
return FALSE;
}
GST_LOG ("payload crc validation: %02x", crc_read);
return TRUE;
}
/**
* gst_dp_validate_packet:
* @header_length: the length of the packet header
* @header: the byte array of the packet header
* @payload: the byte array of the packet payload
*
* Validates the given packet by checking version information and checksums.
*
* Returns: %TRUE if the packet validates
*/
gboolean
gst_dp_validate_packet (guint header_length, const guint8 * header,
const guint8 * payload)
{
if (!gst_dp_validate_header (header_length, header))
return FALSE;
if (!gst_dp_validate_payload (header_length, header, payload))
return FALSE;
return TRUE;
}
/*** PLUGIN STUFF ***/
static gboolean
plugin_init (GstPlugin * plugin)
{
gst_dp_init ();
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstdataprotocol",
"a data protocol to serialize buffers, caps and events",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
*
* dataprotocol.h: Functions implementing the GStreamer Data Protocol
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_DATA_PROTOCOL_H__
#define __GST_DATA_PROTOCOL_H__
#include <gst/gstdata.h>
#include <gst/gstbuffer.h>
#include <gst/gstevent.h>
#include <gst/gstcaps.h>
G_BEGIN_DECLS
/* GStreamer Data Protocol Version */
#define GST_DP_VERSION_MAJOR 0
#define GST_DP_VERSION_MINOR 0
#define GST_DP_HEADER_LENGTH 60 /* header size in bytes */
/* header flags */
typedef enum {
GST_DP_HEADER_FLAG_NONE = 0,
GST_DP_HEADER_FLAG_CRC_HEADER = (1 << 0),
GST_DP_HEADER_FLAG_CRC_PAYLOAD = (1 << 1),
GST_DP_HEADER_FLAG_CRC = (1 << 1) | (1 <<0),
} GstDPHeaderFlag;
/* payload types */
typedef enum {
GST_DP_PAYLOAD_NONE = 0,
GST_DP_PAYLOAD_BUFFER,
GST_DP_PAYLOAD_CAPS,
GST_DP_PAYLOAD_EVENT_NONE = 64,
} GstDPPayloadType;
/* payload information from header */
guint32 gst_dp_header_payload_length (const guint8 * header);
GstDPPayloadType
gst_dp_header_payload_type (const guint8 * header);
/* converting from GstBuffer/GstEvent/GstCaps */
gboolean gst_dp_header_from_buffer (const GstBuffer * buffer,
GstDPHeaderFlag flags,
guint * length,
guint8 ** header);
gboolean gst_dp_packet_from_caps (const GstCaps * caps,
GstDPHeaderFlag flags,
guint * length,
guint8 ** header,
guint8 ** payload);
gboolean gst_dp_packet_from_event (const GstEvent * event,
GstDPHeaderFlag flags,
guint * length,
guint8 ** header,
guint8 ** payload);
/* converting to GstBuffer/GstEvent/GstCaps */
GstBuffer * gst_dp_buffer_from_header (guint header_length,
const guint8 * header);
GstCaps * gst_dp_caps_from_packet (guint header_length,
const guint8 * header,
const guint8 * payload);
GstEvent * gst_dp_event_from_packet (guint header_length,
const guint8 * header,
const guint8 * payload);
/* validation */
gboolean gst_dp_validate_header (guint header_length,
const guint8 * header);
gboolean gst_dp_validate_payload (guint header_length,
const guint8 * header,
const guint8 * payload);
gboolean gst_dp_validate_packet (guint header_length,
const guint8 * header,
const guint8 * payload);
G_END_DECLS
#endif /* __GST_DATA_PROTOCOL_H__ */

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
*
* dp-private.h: private defines/macros for dataprotocol implementation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_DP_PRIVATE_H__
#define __GST_DP_PRIVATE_H__
#include <gst/gstdata.h>
#include <gst/gstbuffer.h>
#include <gst/gstevent.h>
#include <gst/gstcaps.h>
G_BEGIN_DECLS
/* read the given type out of the byte buffer using glib conversion macros */
#define GST_DP_GUINT16(x) GUINT16_FROM_BE (* (guint16 *) (x))
#define GST_DP_GUINT32(x) GUINT32_FROM_BE (* (guint32 *) (x))
#define GST_DP_GUINT64(x) GUINT64_FROM_BE (* (guint64 *) (x))
/* accessor defines */
#define GST_DP_HEADER_MAJOR_VERSION(x) ((x)[0])
#define GST_DP_HEADER_MINOR_VERSION(x) ((x)[1])
#define GST_DP_HEADER_FLAGS(x) ((x)[2])
#define GST_DP_HEADER_PAYLOAD_TYPE(x) ((x)[3])
#define GST_DP_HEADER_PAYLOAD_LENGTH(x) GST_DP_GUINT32 (x + 4)
#define GST_DP_HEADER_TIMESTAMP(x) GST_DP_GUINT64 (x + 8)
#define GST_DP_HEADER_DURATION(x) GST_DP_GUINT64 (x + 16)
#define GST_DP_HEADER_OFFSET(x) GST_DP_GUINT64 (x + 24)
#define GST_DP_HEADER_OFFSET_END(x) GST_DP_GUINT64 (x + 32)
#define GST_DP_HEADER_CRC_HEADER(x) GST_DP_GUINT16 (x + 56)
#define GST_DP_HEADER_CRC_PAYLOAD(x) GST_DP_GUINT16 (x + 58)
void gst_dp_dump_byte_array (guint8 *array, guint length);
G_END_DECLS
#endif /* __GST_DP_PRIVATE_H__ */