Sensoray 2251 Rev.A Manual do Utilizador descarregar pdf (Página 34)

function will check for start codes. It is recommended, therefore to separate the data. For

instance, if you want to store a 32 bit (4 byte) latitude position in the stream, you could put the

high order bytes in the first 2 bytes of user data, followed by a “marker byte” of 0xff, and put the

other 2 bytes in the next 2 user data bytes.

Eg. For a latitude with hex value 0x70000111, the user data would be

data[0] = 0x70, data[1] = 0x00, data[2]=0xff(marker), data[3]=0x11, data[4]=0x11

Similarly, if other user data needs inserted, simply add a market byte to separate the data into

sections.

Parameters

int insize

input size of the embedded data.

const void *data

pointer to user data

board

Board number in system.

Returns

0 if success, negative if error.

MID2250_API int SN_GetPlaybackFrame(

long inSize,

unsigned char *pFrame,

BITMAPINFOHEADER *pBMI,

int type,

int block,

int timeout,

int vidnum

);

SN_GetPlaybackFrame retrieves current frame being decoded after SN_PlaybackVideo. It can

retrieve Uncompressed frames and MPEG data from the playback. The pBMI returned contains the

image parameter. It is up to the user to determine a reasonable image size for pFrame

beforehand. For example, if the user needs RGB24, they should allocate at least 720x480x3 for

NTSC and 768x576*3 for PAL. For compressed data, the video output comes out of the demux in

very small packets. Therefor, this function does not work the same as SN_GetFrame where the

images are packetized by MPEG picture headers, but returns all of the MPEG data received since

the last call.

Parameters

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Sensoray 2251 Rev.A Manual do Utilizador Página 34