Hi all,
I'm using DVSDK 3.10.00.19.
In the datasheetof the jpegenc i read :
"Huffman tables are hard-codec and built into the application at compile-time"
In the idmjpge.h i read :
#ifdef iVLCD
/*
* ======== IDMJPGE_TIGEM_CustomHuffmanTables ========
* JPEG Encoder Custom Huffman Tables - This structure has two parts
* 1. The first part defines the custom VLC tables that need to be passed to
* the JPEG Encoder. This will be used in the VLC Module.
* 2. The second part defines the format in which the custom Huffman tables
* need to be passed to the JPEG Encoder. This is compliant with the format
* specified in RFC 2035 (RTP Payload Format for JPEG-compressed Video).This
* is used to create the DHT marker in the JPEG Header.
*
* NOTE 1: An important note about the alignment requirement of this structure.
* This structure should be aligned to 128 byte boundary,i.e., the last 7 bits
* in the allocated base address should be zeroes.
*
* NOTE 2: The "IDMJPGE_TIGEM_DynamicParams" structure defined below contains
* a pointer to this structure of type "IDMJPGE_TIGEM_CustomHuffmanTables" -
* "IDMJPGE_TIGEM_CustomHuffmanTables *huffmanTable".
* This field is used to pass custom Huffman tables to the JPEG Encoder.
* The application just needs to initialize this field appropriately.
* However, if the application wishes to use the Standard Huffman Tables, then
* there are 2 ways of informing this to the JPEG Encoder -
* (a) by using the base class only "IIMGENC1_DynamicParams" and not the
* extended class "IDMJPGE_TIGEM_DynamicParams", in which case the size field
* in the DynamicParams structure should be set to the size of
* "IIMGENC1_DynamicParams".
* (b) by using the extended class "IDMJPGE_TIGEM_DynamicParams", but by
* setting the field "IDMJPGE_TIGEM_CustomHuffmanTables *huffmanTable" to NULL
*/
typedef struct IDMJPGE_TIGEM_CustomHuffmanTables
{
But the extended structure doesn't appear in the user guide.
So, could someone can give the answer for "Can i use custom Huffman Tables with this encoder ?"
If yes, how i define iVLCD to use the extended struct or where can i add my huffman tables ?
Thanks,
Mika
