高通 mct 里面充斥了宏#define MCT_OBJECT_CAST(obj) ((mct_object_t*)(obj))，对mct_object_t 的调用的理解可以最简单的参考如下的代码，mct_object_t 是如何在不同的结构体传递。
#include <stdio.h>#include <stdlib.h>#include <malloc.h>typedef struct _mct_object mct_object_t;typedef struct _mct_stream mct_stream_t;typedef struct _mct_module mct_module_t;struct _mct_object {unsigned intparentsnum;unsigned intchildrennum;char* name;};struct _mct_module {mct_object_tobject;unsigned int numsrcports;};struct _mct_stream {mct_object_tobject;unsigned int streamid;unsigned int frmaeid;;};void mct_object_set_parent(mct_object_t *object, mct_object_t *parent){object->name = parent->name;object->parentsnum = parent->parentsnum;object->childrennum = parent->childrennum;printf("stream %p module %p\n",object,parent);}int main(){mct_stream_t* stream = (mct_stream_t *)malloc(sizeof(mct_stream_t));mct_module_t* module = (mct_module_t *)malloc(sizeof(mct_module_t));printf("stream %p module %p\n",stream,module);module->numsrcports = 1;module->object.parentsnum = 1;module->object.childrennum = 1;module->object.name = "module";stream->streamid = 2;stream->frmaeid = 2;stream->object.parentsnum = 2;stream->object.childrennum = 2;stream->object.name= "stream";printf("stream->object.parentsnum=%d stream->object.childrennum=%d stream->object.name=%s\n",stream->object.parentsnum,stream->object.childrennum,stream->object.name);mct_object_set_parent((mct_object_t*)stream,(mct_object_t*)module);printf("stream->object.parentsnum=%d stream->object.childrennum=%d stream->object.name=%s\n",stream->object.parentsnum,stream->object.childrennum,stream->object.name);printf("stream %p module %p\n",stream,module);free(stream);free(module);return 0;}
打印 log 如下
stream 0x20fd010 module 0x20fd030stream->object.parentsnum=2 stream->object.childrennum=2 stream->object.name=streamstream 0x20fd010 module 0x20fd030stream->object.parentsnum=1 stream->object.childrennum=1 stream->object.name=modulestream 0x20fd010 module 0x20fd030
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