Not all services may be supported by the hardware on all lines this is especially true for VBI output where Teletext is often unsupported and other services can only be inserted in one specific line. When the driver allocates resources at this point, it may return an EBUSY error code if the required resources are temporarily unavailable. It may contain less services than requested, perhaps just one, if the hardware cannot handle more services simultaneously.
It may be empty zero if none of the requested services are supported by the hardware. Applications initialize this array with sets of data services the driver shall look for or insert on the respective scan line. Subject to hardware capabilities drivers return the requested set, a subset, which may be just a single service, or an empty set. When the hardware cannot handle multiple services on the same line the driver shall choose one. No assumptions can be made on which service the driver chooses.
Data services are defined in Sliced VBI services. Array indices map to ITU-R line numbers [2] as follows:. ETS ,. ITU BT.
EN Drivers may return an EINVAL error code when applications attempt to read or write data without prior format negotiation, after switching the video standard which may invalidate the negotiated VBI parameters and after switching the video input which may change the video standard as a side effect.
A single read or write call must pass all data belonging to one video frame. Packets are always passed in ascending line number order, without duplicate line numbers. When the line numbers are unknown the driver must pass the packets in transmitted order. The driver can insert empty packets with id set to zero anywhere in the packet array. To assure synchronization and to distinguish from frame dropping, when a captured frame does not carry any of the requested data services drivers must pass one or more empty packets.
The latter bears the possibility of synchronizing video and VBI data by using buffer timestamps. No MPEG stream data structures are specified for this format.
Historical context : This format specification originates from a custom, embedded, sliced VBI data format used by the ivtv driver. Please refer to the MPEG-2 specifications for details on those packet headers. The payload is variable length, depending on the actual number of lines of sliced VBI data present in a video frame. The payload may be padded at the end with unspecified fill bytes to align the end of the payload to a 4-byte boundary. Bitmasks indicating the VBI service lines present.
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