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按照xdais标准，DSP端的程序需要实现一些接口，例如video_copy中，在videnc_copy.c中，

#define IALGFXNS  \

    &VIDENCCOPY_TI_IALG,        /* module ID */                         \

    VIDENCCOPY_TI_activate,     /* activate */                          \

    VIDENCCOPY_TI_alloc,        /* alloc */                             \

    NULL,                       /* control (NULL => no control ops) */  \

    VIDENCCOPY_TI_deactivate,   /* deactivate */                        \

    VIDENCCOPY_TI_free,         /* free */                              \

    VIDENCCOPY_TI_initObj,      /* init */                              \

    NULL,                       /* moved */                             \

    NULL                        /* numAlloc (NULL => IALG_MAXMEMRECS) */

/*

 *  ======== VIDENCCOPY_TI_IVIDENC ========

 *  This structure defines TI's implementation of the IVIDENC interface

 *  for the VIDENCCOPY_TI module.

 */

IVIDENC_Fxns VIDENCCOPY_TI_VIDENCCOPY = {    /* module_vendor_interface */

    {IALGFXNS},

    VIDENCCOPY_TI_process,

    VIDENCCOPY_TI_control,

};

定义的结构体VIDENCCOPY_TI_VIDENCCOPY，在VIDENC_COPY.xdc做了注册（用“注册”不知道是否准确）

override readonly config String ialgFxns = "VIDENCCOPY_TI_VIDENCCOPY";

其中VIDENC_COPY是本模块的名字，在package.xdc中指定。

下面是结构体IALGFXNS的定义

00168 /*

00169 *      algAlloc()        - apps call this to query the algorithm about

00170 *                          its memory requirements. Must be non-NULL.

00171 *      algControl()      - algorithm specific control operations.  May be

00172 *                          NULL; NULL => no operations supported.

00173 *      algDeactivate()   - notification that current instance is about to

00174 *                          be "deactivated".  May be NULL; NULL => do nothing.

00175 *      algFree()         - query algorithm for memory to free when removing

00176 *                          an instance.  Must be non-NULL.

00177 *      algInit()         - apps call this to allow the algorithm to

00178 *                          initialize memory requested via algAlloc().  Must

00179 *                          be non-NULL.

00180 *      algMoved()        - apps call this whenever an algorithms object or

00181 *                          any pointer parameters are moved in real-time.

00182 *                          May be NULL; NULL => object can not be moved.

00183 *      algNumAlloc()     - query algorithm for number of memory requests.

00184 *                          May be NULL; NULL => number of mem recs is less

00185 *                          then #IALG_DEFMEMRECS.

00186 */

00187 typedef struct IALG_Fxns {

00192     Void    *implementationId;

00193

00243     Void    (*algActivate)(IALG_Handle handle);

00244

00317     Int     (*algAlloc)(const IALG_Params *params,

00318         struct IALG_Fxns **parentFxns, IALG_MemRec *memTab);

00319

00360     Int     (*algControl)(IALG_Handle handle, IALG_Cmd cmd,

00361         IALG_Status *status);

00362

00416     Void    (*algDeactivate)(IALG_Handle handle);

00417

00458     Int     (*algFree)(IALG_Handle handle, IALG_MemRec *memTab);

00459

00608     Int     (*algInit)(IALG_Handle handle, const IALG_MemRec *memTab,

00609         IALG_Handle parent, const IALG_Params *params);

00610

00631     Void    (*algMoved)(IALG_Handle handle, const IALG_MemRec *memTab,

00632         IALG_Handle parent, const IALG_Params *params);

00633

00690     Int     (*algNumAlloc)(Void);

00691 } IALG_Fxns;

对于DSP算法生命周期的三个阶段，对应的函数为

创建：algNumAlloc  algAlloc algInit

执行：algActivate algDeactivate algMoved

删除：algFree