Sensoray 2251 Rev.A Manuel d'utilisateur télécharger pdf (Page 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 Manuel d'utilisateur Page 34