SSP_ConvertJpegEncodeData

Syntax


BOOL SSP_ConvertJpegEncodeData(const void* src, u8 *wrk, u32 width, u32 height, u32 sampling, u32 option);

Arguments

src Image data to be encoded (RGB555 or YUV422).
wrk Work buffer.
The SSP_GetJpegEncoderBufferSize function calculates the required size.
width Width (in pixels) of the image to encode.
height Height (in pixels) of the image to encode.
sampling Main image output format (SSP_JPEG_OUTPUT_YUV444, SSP_JPEG_OUTPUT_YUV420, or SSP_JPEG_OUTPUT_YUV422) to use at time of encoding.
option Encoding options (SSP_JPEG_RGB555, SSP_JPEG_YUV422, or SSP_JPEG_THUMBNAIL).

Return Values

TRUE if successful.

Description

Converts image data into a format used for encoding in a JPEG file.
RGB555 and YUV422 formats can be used for the image data to be encoded. When you specify YUV422 image data as src, you must specify SSP_JPEG_YUV422 in option. If you want to encode a thumbnail icon, you must specify SSP_JPEG_THUMBNAIL in option.
Therefore, to encode a YUV422 image along with a thumbnail icon, you must specify SSP_JPEG_YUV422|SSP_JPEG_THUMBNAIL in option.

The height and width of an image that can be encoded differs depending on the value of sampling.
If SSP_JPEG_OUTPUT_YUV444 is specified, both the height and width of the image must be a multiple of 8.
If SSP_JPEG_OUTPUT_YUV420 is specified, both the height and width of the image must be a multiple of 16.
If SSP_JPEG_OUTPUT_YUV422 is specified, the height must be a multiple of 8, and the width a multiple of 16.


Because actual encoding is performed using the SSP_StartJpegEncoderWithEncodeData function, src, which represents input source data, can be destroyed without problem upon termination of this function.

See Also

SSP_StartJpegEncoderWithEncodeData
SSP_GetJpegEncoderBufferSize

Revision History

2008/11/14 Initial version.


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