GstProtectionMeta: GStreamer 1.0 Core Reference Manual

GstProtectionMeta

GstProtectionMeta — Functions and classes to support encrypted streams.

Functions

GstProtectionMeta *	gst_buffer_add_protection_meta ()
#define	gst_buffer_get_protection_meta()
const gchar *	gst_protection_select_system ()

Types and Values

struct	GstProtectionMeta
#define	GST_PROTECTION_SYSTEM_ID_CAPS_FIELD

Includes

#include <gst/gstprotection.h>

Description

The GstProtectionMeta class enables the information needed to decrypt a GstBuffer to be attached to that buffer.

Typically, a demuxer element would attach GstProtectionMeta objects to the buffers that it pushes downstream. The demuxer would parse the protection information for a video/audio frame from its input data and use this information to populate the GstStructure info field, which is then encapsulated in a GstProtectionMeta object and attached to the corresponding output buffer using the gst_buffer_add_protection_meta() function. The information in this attached GstProtectionMeta would be used by a downstream decrypter element to recover the original unencrypted frame.

Functions

gst_buffer_add_protection_meta ()

GstProtectionMeta *
gst_buffer_add_protection_meta (GstBuffer *buffer,
                                GstStructure *info);

Attaches protection metadata to a GstBuffer.

Parameters

buffer	GstBuffer holding an encrypted sample, to which protection metadata should be added.
info	a GstStructure holding cryptographic information relating to the sample contained in `buffer` . This function takes ownership of `info` .	[transfer full]

Returns

a pointer to the added GstProtectionMeta if successful; NULL if unsuccessful.

[transfer none]

Since: 1.6

gst_buffer_get_protection_meta()

#define             gst_buffer_get_protection_meta(b)

gst_protection_select_system ()

const gchar *
gst_protection_select_system (const gchar **system_identifiers);

Iterates the supplied list of UUIDs and checks the GstRegistry for an element that supports one of the supplied UUIDs. If more than one element matches, the system ID of the highest ranked element is selected.

Parameters

system_identifiers

A null terminated array of strings that contains the UUID values of each protection system that is to be checked.

[transfer none]

Returns

One of the strings from system_identifiers that indicates the highest ranked element that implements the protection system indicated by that system ID, or NULL if no element has been found.

[transfer none]

Since: 1.6

Types and Values

struct GstProtectionMeta

struct GstProtectionMeta {
  GstMeta meta;

  GstStructure *info;
};

Metadata type that holds information about a sample from a protection-protected track, including the information needed to decrypt it (if it is encrypted).

Members

GstMeta `meta`;	the parent GstMeta.
GstStructure *`info`;	the cryptographic information needed to decrypt the sample.

Since: 1.6

GST_PROTECTION_SYSTEM_ID_CAPS_FIELD

#define GST_PROTECTION_SYSTEM_ID_CAPS_FIELD "protection-system"

The field name in a GstCaps that is used to signal the UUID of the protection system.

Since: 1.6