+++ /dev/null
-/* GStreamer
- * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
- * Copyright (C) 2004,2006 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.
- */
-
-/**
- * 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.
- *
- * The versioning of the protocol is independent of GStreamer's version.
- * The major number gets incremented, and the minor reset, for incompatible
- * changes. The minor number gets incremented for compatible changes that
- * allow clients who do not completely understand the newer protocol version
- * to still decode what they do understand.
- *
- * 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.
- *
- * For reference, this image shows the byte layout of the GDP header:
- *
- * <inlinegraphic format="PNG" fileref="gdp-header.png"></inlinegraphic>
- */
-
-#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_STATIC (data_protocol_debug);
-#define GST_CAT_DEFAULT data_protocol_debug
-
-/* helper macros */
-
-/* write first 6 bytes of header */
-#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; \
- h[3] = 0; /* padding byte */ \
- GST_WRITE_UINT16_BE (h + 4, type); \
-} G_STMT_END
-
-#define GST_DP_SET_CRC(h, flags, payload, length); \
-G_STMT_START { \
- guint16 crc = 0; \
- if (flags & GST_DP_HEADER_FLAG_CRC_HEADER) \
- /* we don't crc the last four bytes since they are crc's */ \
- crc = gst_dp_crc (h, 58); \
- GST_WRITE_UINT16_BE (h + 58, crc); \
- \
- crc = 0; \
- if (length && (flags & GST_DP_HEADER_FLAG_CRC_PAYLOAD)) \
- crc = gst_dp_crc (payload, length); \
- GST_WRITE_UINT16_BE (h + 60, crc); \
-} 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
- * 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
-
-/*** 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;
- guint8 *data;
- gsize size;
-
- g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
- g_return_val_if_fail (length, 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);
-
- data = gst_buffer_map ((GstBuffer *) buffer, &size, NULL, GST_MAP_READ);
-
- /* buffer properties */
- GST_WRITE_UINT32_BE (h + 6, size);
- 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_LIVE | 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, data, size);
-
- gst_buffer_unmap ((GstBuffer *) buffer, data, size);
-
- 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;
-
- g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
- g_return_val_if_fail (length, 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 ***/
-
-static const guint16 gst_dp_crc_table[256] = {
- 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
- 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
- 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
- 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
- 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
- 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
- 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
- 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
- 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
- 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
- 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
- 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
- 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
- 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
- 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
- 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
- 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
- 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
- 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
- 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
- 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
- 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
- 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
- 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
- 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
- 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
- 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
- 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
- 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
- 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
- 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
- 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
-};
-
-/**
- * gst_dp_crc:
- * @buffer: array of bytes
- * @length: the length of @buffer
- *
- * Calculate a CRC for the given buffer over the given number of bytes.
- * This is only provided for verification purposes; typical GDP users
- * will not need this function.
- *
- * Returns: a two-byte CRC checksum.
- */
-guint16
-gst_dp_crc (const guint8 * buffer, guint length)
-{
- guint16 crc_register = CRC_INIT;
-
- g_return_val_if_fail (buffer != NULL || length == 0, 0);
-
- /* calc CRC */
- for (; length--;) {
- crc_register = (guint16) ((crc_register << 8) ^
- gst_dp_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_malloc0 (3 * n + 1);
-
- 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);
-}
-
-GType
-gst_dp_version_get_type (void)
-{
- static gsize gst_dp_version_type = 0;
- static const GEnumValue gst_dp_version[] = {
- {GST_DP_VERSION_0_2, "GST_DP_VERSION_0_2", "0.2"},
- {GST_DP_VERSION_1_0, "GST_DP_VERSION_1_0", "1.0"},
- {0, NULL, NULL},
- };
-
- if (g_once_init_enter (&gst_dp_version_type)) {
- GType tmp = g_enum_register_static ("GstDPVersion", gst_dp_version);
- g_once_init_leave (&gst_dp_version_type, tmp);
- }
-
- return (GType) gst_dp_version_type;
-};
-
-/**
- * gst_dp_init:
- *
- * Initialize GStreamer Data Protocol library.
- *
- * Should be called before using these functions from source linking
- * to this source file.
- */
-void
-gst_dp_init (void)
-{
- static gboolean _gst_dp_initialized = FALSE;
-
- if (_gst_dp_initialized)
- return;
-
- _gst_dp_initialized = TRUE;
-
- g_type_class_ref (gst_dp_version_get_type ());
-
- GST_DEBUG_CATEGORY_INIT (data_protocol_debug, "gdp", 0,
- "GStreamer Data Protocol");
-}
-
-/**
- * gst_dp_header_payload_length:
- * @header: the byte header of the packet array
- *
- * Get the length of the payload described by @header.
- *
- * Returns: the length of the payload this header describes.
- */
-guint32
-gst_dp_header_payload_length (const guint8 * header)
-{
- g_return_val_if_fail (header != NULL, 0);
-
- return GST_DP_HEADER_PAYLOAD_LENGTH (header);
-}
-
-/**
- * gst_dp_header_payload_type:
- * @header: the byte header of the packet array
- *
- * Get the type of the payload described by @header.
- *
- * Returns: the #GstDPPayloadType the payload this header describes.
- */
-GstDPPayloadType
-gst_dp_header_payload_type (const guint8 * header)
-{
- g_return_val_if_fail (header != NULL, GST_DP_PAYLOAD_NONE);
-
- return GST_DP_HEADER_PAYLOAD_TYPE (header);
-}
-
-/*** PACKETIZER FUNCTIONS ***/
-
-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);
-}
-
-static 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);
-}
-
-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;
- const GstStructure *structure;
-
- g_return_val_if_fail (GST_IS_EVENT (event), FALSE);
- g_return_val_if_fail (length, 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);
-
- structure = gst_event_get_structure ((GstEvent *) event);
- if (structure) {
- string = (guchar *) gst_structure_to_string (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", event);
- 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, string, 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
- * @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.
- *
- * This function does not check the header passed to it, use
- * gst_dp_validate_header() first if the header data is unchecked.
- *
- * Returns: A #GstBuffer if the buffer was successfully created, or NULL.
- */
-GstBuffer *
-gst_dp_buffer_from_header (guint header_length, const guint8 * header)
-{
- GstBuffer *buffer;
-
- g_return_val_if_fail (header != NULL, NULL);
- g_return_val_if_fail (header_length >= GST_DP_HEADER_LENGTH, NULL);
- g_return_val_if_fail (GST_DP_HEADER_PAYLOAD_TYPE (header) ==
- GST_DP_PAYLOAD_BUFFER, NULL);
-
- buffer =
- gst_buffer_new_allocate (NULL,
- (guint) GST_DP_HEADER_PAYLOAD_LENGTH (header), 0);
-
- 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);
- GST_BUFFER_FLAGS (buffer) = GST_DP_HEADER_BUFFER_FLAGS (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.
- *
- * This function does not check the arguments passed to it, use
- * gst_dp_validate_packet() first if the header and payload data are
- * unchecked.
- *
- * Returns: A #GstCaps containing the caps represented in the packet,
- * or NULL if the packet could not be converted.
- */
-GstCaps *
-gst_dp_caps_from_packet (guint header_length, const guint8 * header,
- const guint8 * payload)
-{
- GstCaps *caps;
- gchar *string;
-
- g_return_val_if_fail (header, NULL);
- g_return_val_if_fail (header_length >= GST_DP_HEADER_LENGTH, NULL);
- g_return_val_if_fail (GST_DP_HEADER_PAYLOAD_TYPE (header) ==
- GST_DP_PAYLOAD_CAPS, NULL);
- g_return_val_if_fail (payload, NULL);
-
- /* 0 sized payload length will work create NULL string */
- string = g_strndup ((gchar *) payload, GST_DP_HEADER_PAYLOAD_LENGTH (header));
- caps = gst_caps_from_string (string);
- g_free (string);
-
- return caps;
-}
-
-static GstEvent *
-gst_dp_event_from_packet_0_2 (guint header_length, const guint8 * header,
- const guint8 * payload)
-{
- GstEvent *event = NULL;
- GstEventType type;
-
- type = GST_DP_HEADER_PAYLOAD_TYPE (header) - GST_DP_PAYLOAD_EVENT_NONE;
- switch (type) {
- case GST_EVENT_UNKNOWN:
- GST_WARNING ("Unknown event, ignoring");
- return NULL;
- case GST_EVENT_EOS:
- case GST_EVENT_FLUSH_START:
- case GST_EVENT_FLUSH_STOP:
- case GST_EVENT_SEGMENT:
- event = gst_event_new_custom (type, NULL);
- GST_EVENT_TIMESTAMP (event) = GST_DP_HEADER_TIMESTAMP (header);
- break;
- case GST_EVENT_SEEK:
- {
- gdouble rate;
- GstFormat format;
- GstSeekFlags flags;
- GstSeekType cur_type, stop_type;
- gint64 cur, stop;
-
- g_return_val_if_fail (payload != NULL, NULL);
-
- /* FIXME, read rate */
- rate = 1.0;
- format = (GstFormat) GST_READ_UINT32_BE (payload);
- flags = (GstSeekFlags) GST_READ_UINT32_BE (payload + 4);
- cur_type = (GstSeekType) GST_READ_UINT32_BE (payload + 8);
- cur = (gint64) GST_READ_UINT64_BE (payload + 12);
- stop_type = (GstSeekType) GST_READ_UINT32_BE (payload + 20);
- stop = (gint64) GST_READ_UINT64_BE (payload + 24);
-
- event = gst_event_new_seek (rate, format, flags, cur_type, cur,
- stop_type, stop);
- GST_EVENT_TIMESTAMP (event) = GST_DP_HEADER_TIMESTAMP (header);
- break;
- }
- case GST_EVENT_QOS:
- case GST_EVENT_NAVIGATION:
- case GST_EVENT_TAG:
- GST_WARNING ("Unhandled event type %d, ignoring", type);
- return NULL;
- default:
- GST_WARNING ("Unknown event type %d, ignoring", type);
- return NULL;
- }
-
- 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 = NULL;
- GstStructure *s = NULL;
-
- type = GST_DP_HEADER_PAYLOAD_TYPE (header) - GST_DP_PAYLOAD_EVENT_NONE;
- if (payload) {
- string =
- g_strndup ((gchar *) payload, GST_DP_HEADER_PAYLOAD_LENGTH (header));
- s = gst_structure_from_string (string, NULL);
- g_free (string);
- }
- 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.
- *
- * This function does not check the arguments passed to it, use
- * gst_dp_validate_packet() first if the header and payload data are
- * unchecked.
- *
- * 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);
- g_return_val_if_fail (header_length >= GST_DP_HEADER_LENGTH, 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
- * @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;
-
- g_return_val_if_fail (header != NULL, FALSE);
- g_return_val_if_fail (header_length >= GST_DP_HEADER_LENGTH, FALSE);
-
- if (!(GST_DP_HEADER_FLAGS (header) & GST_DP_HEADER_FLAG_CRC_HEADER))
- return TRUE;
-
- crc_read = GST_DP_HEADER_CRC_HEADER (header);
-
- /* don't include the last two crc fields for the crc check */
- crc_calculated = gst_dp_crc (header, header_length - 4);
- if (crc_read != crc_calculated)
- goto crc_error;
-
- GST_LOG ("header crc validation: %02x", crc_read);
- return TRUE;
-
- /* ERRORS */
-crc_error:
- {
- GST_WARNING ("header crc mismatch: read %02x, calculated %02x", crc_read,
- crc_calculated);
- return FALSE;
- }
-}
-
-/**
- * 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;
-
- g_return_val_if_fail (header != NULL, FALSE);
- g_return_val_if_fail (header_length >= GST_DP_HEADER_LENGTH, FALSE);
-
- 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)
- goto crc_error;
-
- GST_LOG ("payload crc validation: %02x", crc_read);
- return TRUE;
-
- /* ERRORS */
-crc_error:
- {
- GST_WARNING ("payload crc mismatch: read %02x, calculated %02x", crc_read,
- crc_calculated);
- return FALSE;
- }
-}
-
-/**
- * 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;
-}
-
-/**
- * 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_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);
-}
projects / platform / upstream / gstreamer.git / commitdiff