index dd290cc01752bbf84955062f5817810740ba266c..9e71bd1071408366a5ed07c3459ae32ecacc25ba 100644 (file)
#include "dp-private.h"
/* debug category */
-GST_DEBUG_CATEGORY (data_protocol_debug);
+GST_DEBUG_CATEGORY_STATIC (data_protocol_debug);
#define GST_CAT_DEFAULT data_protocol_debug
/* helper macros */
guint16 flags_mask;
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;
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 (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);
/*** 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
guint16
gst_dp_crc (const guint8 * buffer, guint length)
{
- static gboolean initialized = FALSE;
- static guint16 crc_table[256];
guint16 crc_register = CRC_INIT;
- 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;
- }
+ g_return_val_if_fail (buffer != NULL || length == 0, 0);
/* calc CRC */
for (; length--;) {
crc_register = (guint16) ((crc_register << 8) ^
- crc_table[((crc_register >> 8) & 0x00ff) ^ *buffer++]);
+ gst_dp_crc_table[((crc_register >> 8) & 0x00ff) ^ *buffer++]);
}
return (0xffff ^ crc_register);
}
guint32
gst_dp_header_payload_length (const guint8 * header)
{
+ g_return_val_if_fail (header != NULL, 0);
+
return GST_DP_HEADER_PAYLOAD_LENGTH (header);
}
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);
}
GST_DP_VERSION_0_2);
}
-gboolean
+static gboolean
gst_dp_packet_from_caps_1_0 (const GstCaps * caps, GstDPHeaderFlag flags,
guint * length, guint8 ** header, guint8 ** payload)
{
guint8 *h;
guint pl_length; /* length of payload */
- g_return_val_if_fail (event, FALSE);
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);
-
/* first construct payload, since we need the length */
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_UNKNOWN:
GST_WARNING ("Unknown event, ignoring");
- *length = 0;
- g_free (h);
return FALSE;
case GST_EVENT_EOS:
case GST_EVENT_FLUSH_START:
case GST_EVENT_NAVIGATION:
case GST_EVENT_TAG:
GST_WARNING ("Unhandled event type %d, ignoring", GST_EVENT_TYPE (event));
- *length = 0;
- g_free (h);
return FALSE;
default:
GST_WARNING ("Unknown event type %d, ignoring", GST_EVENT_TYPE (event));
- *length = 0;
- g_free (h);
return FALSE;
}
+ /* now we can create and fill the header */
+ h = g_malloc0 (GST_DP_HEADER_LENGTH);
+ *length = GST_DP_HEADER_LENGTH;
+
/* version, flags, type */
GST_DP_INIT_HEADER (h, GST_DP_VERSION_0_2, flags,
GST_DP_PAYLOAD_EVENT_NONE + GST_EVENT_TYPE (event));
GST_LOG ("created header from event:");
gst_dp_dump_byte_array (h, GST_DP_HEADER_LENGTH);
+
*header = h;
return TRUE;
}
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 (length, FALSE);
g_return_val_if_fail (header, FALSE);
g_return_val_if_fail (payload, FALSE);
* 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 *
{
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_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);
*
* 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.
*/
gchar *string;
g_return_val_if_fail (header, NULL);
- g_return_val_if_fail (payload, 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;
}
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);
*
* 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.
*/
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);
{
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) {
+ 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_LOG ("header crc validation: %02x", crc_read);
- return TRUE;
}
/**
{
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) {
+ 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_LOG ("payload crc validation: %02x", crc_read);
- return TRUE;
}
/**