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gdp: add a GstDPPacketizer object, and create/free functions

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Original commit message from CVS:
* libs/gst/dataprotocol/dataprotocol.c:
(gst_dp_header_from_buffer_any), (gst_dp_packet_from_caps_any),
(gst_dp_version_get_type), (gst_dp_init),
(gst_dp_header_from_buffer), (gst_dp_header_from_buffer_1_0),
(gst_dp_packet_from_caps), (gst_dp_packet_from_caps_1_0),
(gst_dp_packet_from_event), (gst_dp_packet_from_event_1_0),
(gst_dp_event_from_packet_0_2), (gst_dp_event_from_packet_1_0),
(gst_dp_event_from_packet), (gst_dp_packetizer_new),
(gst_dp_packetizer_free):
* libs/gst/dataprotocol/dataprotocol.h:
API: add a GstDPPacketizer object, and create/free functions
API: add GstDPVersion enum
Add 1.0 event function that uses the string serialization
Serialize more useful buffer flags
Fixes #343988
This commit is contained in:
Thomas Vander Stichele 2006-06-06 14:24:00 +00:00 committed by Tim-Philipp Müller
parent 207c0ce3f1
commit 99e9c6d633
2 changed files with 367 additions and 88 deletions
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402
gst/gdp/dataprotocol.c
View file

@ -20,6 +20,42 @@
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstdataprotocol
* @short_description: Serialization of caps, buffers and events.
* @see_also: #GstCaps, #GstEvent, #GstBuffer
*
* This helper library provides serialization of GstBuffer, GstCaps and
* GstEvent structures.
*
* This serialization is useful when GStreamer needs to interface with
* the outside world to transport data between distinct GStreamer pipelines.
* The connections with the outside world generally don't have mechanisms
* to transport properties of these structures.
*
* For example, transporting buffers across named pipes or network connections
* doesn't maintain the buffer size and separation.
*
* This data protocol assumes a reliable connection-oriented transport, such as
* TCP, a pipe, or a file. The protocol does not serialize the caps for
* each buffer; instead, it transport the caps only when they change in the
* stream. This implies that there will always be a caps packet before any
* buffer packets.
*
* Version 0.2 serializes only a small subset of all events, with a custom
* payload for each type. Also, all GDP streams start with the initial caps
* packet.
*
* Version 1.0 serializes all events by taking the string representation of
* the event as the payload. In addition, GDP streams can now start with
* events as well, as required by the new data stream model in GStreamer 0.10.
*
* Converting buffers, caps and events to GDP buffers is done using a
* #GstDPPacketizer object and invoking its packetizer functions.
* For backwards-compatibility reasons, the old 0.2 methods are still
* available but deprecated.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
@ -37,8 +73,13 @@ GST_DEBUG_CATEGORY (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) \
#define GST_DP_INIT_HEADER(h, version, flags, type) \
G_STMT_START { \
gint maj = 0, min = 0; \
switch (version) { \
case GST_DP_VERSION_0_2: maj = 0; min = 2; break; \
case GST_DP_VERSION_1_0: maj = 1; min = 0; break; \
} \
h[0] = (guint8) maj; \
h[1] = (guint8) min; \
h[2] = (guint8) flags; \
@ -75,6 +116,89 @@ G_STMT_START { \
#define POLY 0x1021
#define CRC_INIT 0xFFFF
/*** HELPER FUNCTIONS ***/
static gboolean
gst_dp_header_from_buffer_any (const GstBuffer * buffer, GstDPHeaderFlag flags,
guint * length, guint8 ** header, GstDPVersion version)
{
guint8 *h;
guint16 flags_mask;
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
g_return_val_if_fail (header, FALSE);
*length = GST_DP_HEADER_LENGTH;
h = g_malloc0 (GST_DP_HEADER_LENGTH);
/* version, flags, type */
GST_DP_INIT_HEADER (h, version, flags, GST_DP_PAYLOAD_BUFFER);
/* buffer properties */
GST_WRITE_UINT32_BE (h + 6, GST_BUFFER_SIZE (buffer));
GST_WRITE_UINT64_BE (h + 10, GST_BUFFER_TIMESTAMP (buffer));
GST_WRITE_UINT64_BE (h + 18, GST_BUFFER_DURATION (buffer));
GST_WRITE_UINT64_BE (h + 26, GST_BUFFER_OFFSET (buffer));
GST_WRITE_UINT64_BE (h + 34, GST_BUFFER_OFFSET_END (buffer));
/* data flags; eats two bytes from the ABI area */
/* we copy everything but the read-only flags */
flags_mask = GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_DISCONT |
GST_BUFFER_FLAG_IN_CAPS | GST_BUFFER_FLAG_GAP |
GST_BUFFER_FLAG_DELTA_UNIT;
GST_WRITE_UINT16_BE (h + 42, GST_BUFFER_FLAGS (buffer) & flags_mask);
GST_DP_SET_CRC (h, flags, GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer));
GST_LOG ("created header from buffer:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
*header = h;
return TRUE;
}
static gboolean
gst_dp_packet_from_caps_any (const GstCaps * caps, GstDPHeaderFlag flags,
guint * length, guint8 ** header, guint8 ** payload, GstDPVersion version)
{
guint8 *h;
guchar *string;
guint payload_length;
/* FIXME: GST_IS_CAPS doesn't work
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE); */
g_return_val_if_fail (caps, FALSE);
g_return_val_if_fail (header, FALSE);
g_return_val_if_fail (payload, FALSE);
*length = GST_DP_HEADER_LENGTH;
h = g_malloc0 (GST_DP_HEADER_LENGTH);
string = (guchar *) gst_caps_to_string (caps);
payload_length = strlen ((gchar *) string) + 1; /* include trailing 0 */
/* version, flags, type */
GST_DP_INIT_HEADER (h, version, flags, GST_DP_PAYLOAD_CAPS);
/* buffer properties */
GST_WRITE_UINT32_BE (h + 6, payload_length);
GST_WRITE_UINT64_BE (h + 10, (guint64) 0);
GST_WRITE_UINT64_BE (h + 18, (guint64) 0);
GST_WRITE_UINT64_BE (h + 26, (guint64) 0);
GST_WRITE_UINT64_BE (h + 34, (guint64) 0);
GST_DP_SET_CRC (h, flags, string, payload_length);
GST_LOG ("created header from caps:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
*header = h;
*payload = string;
return TRUE;
}
/*** PUBLIC FUNCTIONS ***/
/**
* gst_dp_crc:
*
@ -134,6 +258,23 @@ gst_dp_dump_byte_array (guint8 * array, guint length)
g_free (line);
}
GType
gst_dp_version_get_type (void)
{
static GType gst_dp_version_type = 0;
static const GEnumValue gst_dp_version[] = {
{GST_DP_VERSION_0_2, "GDP Version 0.2", "0.2"},
{GST_DP_VERSION_1_0, "GDP Version 1.0", "1.0"},
{0, NULL, NULL},
};
if (!gst_dp_version_type) {
gst_dp_version_type =
g_enum_register_static ("GstDPVersion", gst_dp_version);
}
return gst_dp_version_type;
};
/**
* gst_dp_init:
*
@ -152,12 +293,12 @@ gst_dp_init (void)
_gst_dp_initialized = TRUE;
gst_dp_version_get_type ();
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
@ -186,6 +327,8 @@ gst_dp_header_payload_type (const guint8 * header)
return GST_DP_HEADER_PAYLOAD_TYPE (header);
}
/*** PACKETIZER FUNCTIONS ***/
/**
* gst_dp_header_from_buffer:
* @buffer: a #GstBuffer to create a header for
@ -195,46 +338,24 @@ gst_dp_header_payload_type (const guint8 * header)
*
* Creates a GDP header from the given buffer.
*
* Deprecated: use a #GstDPPacketizer
*
* 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 flags_mask;
return gst_dp_header_from_buffer_any (buffer, flags, length, header,
GST_DP_VERSION_0_2);
}
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
g_return_val_if_fail (header, FALSE);
*length = GST_DP_HEADER_LENGTH;
h = g_malloc0 (GST_DP_HEADER_LENGTH);
/* version, flags, type */
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));
GST_WRITE_UINT64_BE (h + 10, GST_BUFFER_TIMESTAMP (buffer));
GST_WRITE_UINT64_BE (h + 18, GST_BUFFER_DURATION (buffer));
GST_WRITE_UINT64_BE (h + 26, GST_BUFFER_OFFSET (buffer));
GST_WRITE_UINT64_BE (h + 34, GST_BUFFER_OFFSET_END (buffer));
/* 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);
GST_DP_SET_CRC (h, flags, GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer));
GST_LOG ("created header from buffer:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
*header = h;
return TRUE;
static gboolean
gst_dp_header_from_buffer_1_0 (const GstBuffer * buffer, GstDPHeaderFlag flags,
guint * length, guint8 ** header)
{
return gst_dp_header_from_buffer_any (buffer, flags, length, header,
GST_DP_VERSION_1_0);
}
/**
@ -247,44 +368,24 @@ gst_dp_header_from_buffer (const GstBuffer * buffer, GstDPHeaderFlag flags,
*
* Creates a GDP packet from the given caps.
*
* Deprecated: use a #GstDPPacketizer
*
* 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;
guchar *string;
return gst_dp_packet_from_caps_any (caps, flags, length, header, payload,
GST_DP_VERSION_0_2);
}
/* FIXME: GST_IS_CAPS doesn't work
g_return_val_if_fail (GST_IS_CAPS (caps), FALSE); */
g_return_val_if_fail (caps, FALSE);
g_return_val_if_fail (header, FALSE);
g_return_val_if_fail (payload, FALSE);
*length = GST_DP_HEADER_LENGTH;
h = g_malloc0 (GST_DP_HEADER_LENGTH);
string = (guchar *) gst_caps_to_string (caps);
/* version, flags, type */
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 */
GST_WRITE_UINT64_BE (h + 10, (guint64) 0);
GST_WRITE_UINT64_BE (h + 18, (guint64) 0);
GST_WRITE_UINT64_BE (h + 26, (guint64) 0);
GST_WRITE_UINT64_BE (h + 34, (guint64) 0);
GST_DP_SET_CRC (h, flags, string, strlen ((gchar *) string) + 1);
GST_LOG ("created header from caps:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
*header = h;
*payload = string;
return TRUE;
gboolean
gst_dp_packet_from_caps_1_0 (const GstCaps * caps, GstDPHeaderFlag flags,
guint * length, guint8 ** header, guint8 ** payload)
{
return gst_dp_packet_from_caps_any (caps, flags, length, header, payload,
GST_DP_VERSION_1_0);
}
/**
@ -297,6 +398,8 @@ gst_dp_packet_from_caps (const GstCaps * caps, GstDPHeaderFlag flags,
*
* Creates a GDP packet from the given event.
*
* Deprecated: use a #GstDPPacketizer
*
* Returns: %TRUE if the packet was successfully created.
*/
gboolean
@ -365,7 +468,7 @@ gst_dp_packet_from_event (const GstEvent * event, GstDPHeaderFlag flags,
}
/* version, flags, type */
GST_DP_INIT_HEADER (h, GST_DP_VERSION_MAJOR, GST_DP_VERSION_MINOR, flags,
GST_DP_INIT_HEADER (h, GST_DP_VERSION_0_2, flags,
GST_DP_PAYLOAD_EVENT_NONE + GST_EVENT_TYPE (event));
/* length */
@ -381,6 +484,51 @@ gst_dp_packet_from_event (const GstEvent * event, GstDPHeaderFlag flags,
return TRUE;
}
static gboolean
gst_dp_packet_from_event_1_0 (const GstEvent * event, GstDPHeaderFlag flags,
guint * length, guint8 ** header, guint8 ** payload)
{
guint8 *h;
guint32 pl_length; /* length of payload */
guchar *string = NULL;
g_return_val_if_fail (event, FALSE);
g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
g_return_val_if_fail (header, FALSE);
g_return_val_if_fail (payload, FALSE);
*length = GST_DP_HEADER_LENGTH;
h = g_malloc0 (GST_DP_HEADER_LENGTH);
if (event->structure) {
string = (guchar *) gst_structure_to_string (event->structure);
GST_LOG ("event %p has structure, string %s", event, string);
pl_length = strlen ((gchar *) string) + 1; /* include trailing 0 */
} else {
GST_LOG ("event %p has no structure");
pl_length = 0;
}
/* version, flags, type */
GST_DP_INIT_HEADER (h, GST_DP_VERSION_1_0, flags,
GST_DP_PAYLOAD_EVENT_NONE + GST_EVENT_TYPE (event));
/* length */
GST_WRITE_UINT32_BE (h + 6, pl_length);
/* timestamp */
GST_WRITE_UINT64_BE (h + 10, GST_EVENT_TIMESTAMP (event));
GST_DP_SET_CRC (h, flags, *payload, pl_length);
GST_LOG ("created header from event:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
*header = h;
*payload = string;
return TRUE;
}
/*** DEPACKETIZING FUNCTIONS ***/
/**
* gst_dp_buffer_from_header:
* @header_length: the length of the packet header
@ -441,27 +589,13 @@ gst_dp_caps_from_packet (guint header_length, const guint8 * header,
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: A #GstEvent if the event was successfully created,
* or NULL if an event could not be read from the payload.
*/
GstEvent *
gst_dp_event_from_packet (guint header_length, const guint8 * header,
static GstEvent *
gst_dp_event_from_packet_0_2 (guint header_length, const guint8 * header,
const guint8 * payload)
{
GstEvent *event = NULL;
GstEventType type;
g_return_val_if_fail (header, NULL);
/* 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:
@ -509,6 +643,58 @@ gst_dp_event_from_packet (guint header_length, const guint8 * header,
return event;
}
static GstEvent *
gst_dp_event_from_packet_1_0 (guint header_length, const guint8 * header,
const guint8 * payload)
{
GstEvent *event = NULL;
GstEventType type;
gchar *string;
GstStructure *s;
type = GST_DP_HEADER_PAYLOAD_TYPE (header) - GST_DP_PAYLOAD_EVENT_NONE;
string = g_strndup ((gchar *) payload, GST_DP_HEADER_PAYLOAD_LENGTH (header));
s = gst_structure_from_string (string, NULL);
g_free (string);
if (!s)
return NULL;
event = gst_event_new_custom (type, s);
return event;
}
/**
* 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: A #GstEvent if the event was successfully created,
* or NULL if an event could not be read from the payload.
*/
GstEvent *
gst_dp_event_from_packet (guint header_length, const guint8 * header,
const guint8 * payload)
{
guint8 major, minor;
g_return_val_if_fail (header, NULL);
major = GST_DP_HEADER_MAJOR_VERSION (header);
minor = GST_DP_HEADER_MINOR_VERSION (header);
if (major == 0 && minor == 2)
return gst_dp_event_from_packet_0_2 (header_length, header, payload);
else if (major == 1 && minor == 0)
return gst_dp_event_from_packet_1_0 (header_length, header, payload);
else {
GST_ERROR ("Unknown GDP version %d.%d", major, minor);
return NULL;
}
}
/**
* gst_dp_validate_header:
* @header_length: the length of the packet header
@ -588,3 +774,51 @@ gst_dp_validate_packet (guint header_length, const guint8 * header,
return TRUE;
}
/**
* gst_dp_packetizer_new:
* @version: the #GstDPVersion of the protocol to packetize for.
*
* Creates a new packetizer.
*
* Returns: a newly allocated #GstDPPacketizer
*/
GstDPPacketizer *
gst_dp_packetizer_new (GstDPVersion version)
{
GstDPPacketizer *ret;
ret = g_malloc0 (sizeof (GstDPPacketizer));
ret->version = version;
switch (version) {
case GST_DP_VERSION_0_2:
ret->header_from_buffer = gst_dp_header_from_buffer;
ret->packet_from_caps = gst_dp_packet_from_caps;
ret->packet_from_event = gst_dp_packet_from_event;
break;
case GST_DP_VERSION_1_0:
ret->header_from_buffer = gst_dp_header_from_buffer_1_0;
ret->packet_from_caps = gst_dp_packet_from_caps_1_0;
ret->packet_from_event = gst_dp_packet_from_event_1_0;
break;
default:
g_free (ret);
ret = NULL;
break;
}
return ret;
}
/**
* gst_dp_packetizer_free:
* @packetizer: the #GstDPPacketizer to free.
*
* Free the given packetizer.
*/
void
gst_dp_packetizer_free (GstDPPacketizer * packetizer)
{
g_free (packetizer);
}

53
gst/gdp/dataprotocol.h
View file

@ -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) 1999 Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2004,2006 Thomas Vander Stichele <thomas at apestaart dot org>
*
* dataprotocol.h: Functions implementing the GStreamer Data Protocol
*
@ -29,6 +29,21 @@
G_BEGIN_DECLS
/**
* GstDPVersion:
* @GST_DP_VERSION_0_2: protocol version 0.2
* @GST_DP_VERSION_1_0: protocol version 1.0
*
* The version of the GDP protocol being used.
*/
typedef enum {
GST_DP_VERSION_0_2 = 1,
GST_DP_VERSION_1_0,
} GstDPVersion;
GType gst_dp_version_get_type ();
#define GST_TYPE_DP_VERSION (gst_dp_version_get_type ())
/**
* GST_DP_VERSION_MAJOR:
*
@ -62,7 +77,7 @@ 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),
GST_DP_HEADER_FLAG_CRC = (1 << 1) | (1 << 0),
} GstDPHeaderFlag;
/**
@ -82,8 +97,39 @@ typedef enum {
GST_DP_PAYLOAD_EVENT_NONE = 64,
} GstDPPayloadType;
typedef gboolean (*GstDPHeaderFromBufferFunction) (const GstBuffer * buffer,
GstDPHeaderFlag flags,
guint * length,
guint8 ** header);
typedef gboolean (*GstDPPacketFromCapsFunction) (const GstCaps * caps,
GstDPHeaderFlag flags,
guint * length,
guint8 ** header,
guint8 ** payload);
typedef gboolean (*GstDPPacketFromEventFunction) (const GstEvent * event,
GstDPHeaderFlag flags,
guint * length,
guint8 ** header,
guint8 ** payload);
typedef struct {
GstDPVersion version;
GstDPHeaderFromBufferFunction header_from_buffer;
GstDPPacketFromCapsFunction packet_from_caps;
GstDPPacketFromEventFunction packet_from_event;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
} GstDPPacketizer;
void gst_dp_init (void);
/* packetizer */
GstDPPacketizer *
gst_dp_packetizer_new (GstDPVersion version);
void gst_dp_packetizer_free (GstDPPacketizer *packetizer);
/* crc checksum */
guint16 gst_dp_crc (const guint8 * buffer,
guint length);
@ -109,7 +155,6 @@ gboolean gst_dp_packet_from_event (const GstEvent * event,
guint8 ** header,
guint8 ** payload);
/* converting to GstBuffer/GstEvent/GstCaps */
GstBuffer * gst_dp_buffer_from_header (guint header_length,
const guint8 * header);