标签：style blog class code c int
U32 audioHandle = AudioDecOpen(int type)
{
if（type == aac）
return aac_open();
else if(type == mpeg)
return mpeg_open();
}typedef int (*OpenFunc) (void *this); typedef int (*CloseFunc) (void *this); typedef int (*ControlFunc) (void *this, int command, void *param);
struct module
{ OpenFunc Open; CloseFunc Close; ControlFunc Control;};
struct AudioDecoder{
struct module m;
int audioType;
void* private;
};struct AudioPool{
int audioType;
struct module* audioModule;
}pool[] = {
{aac , aac_module},
{mpeg , mpeg_module},
};int AudioCreate(int type , Handle *handle)
{
AudioDecoder dec = alloc_audioDec();
foreach(pool , k)
{
if(k->audioType == type)
{
dec->m = k->audioModule;
}
}
*handle = (Handle)dec;
} 这样，当外界去Create一个Audio的对象时，就已经初始化好对应的函数入口了。Open就非常简单了：int AudioOpen(struct AudioDecoder *dec)
{
return dec->m->Open(dec);
} 其中AudioDecoder中的Private 则是在各自的Open中自己申请，自己释放，Close,Control 类似。struct AudioPool{
int audioType;
struct module* audioModule;
}pool[MAX_POOL];int Pool_Register(int type , struct module* module);
{
for_each(pool , k)
{
if(k->type == INVALID_AUDIO_TYPE)
{
k->type = type;
k->audioModule = module;
}
}
if(k == NULL)
{
return REACH_POOL_END;
}
return NO_ERROR;
}
.
.
.
static int Close(void *this)
{
AudioSoftDecoder *ad = (AudioSoftDecoder*)this;
if(!ad || !ad->privateData)
{
syslog(LOG_ERR , "%s(%d):Bad Parameter !!!\n" , __FUNCTION__ , __LINE__ );
return CT_ERROR_BAD_PARAMETER;
}
AacFaadPrivate *private = (AacFaadPrivate *)ad->privateData;
private->exit = TRUE;
if(private->decoderPid > 0)
{
pthread_join(private->decoderPid , NULL);
}
if(private->hDecoder)
{
NeAACDecClose(private->hDecoder);
}
free(private);
ad->privateData = NULL;
return CT_ERROR_NO_ERROR;
}
int AAC_Init()
{
return RegisterAudioSoftDec(AudioDecType_AAC ,&aacModule);
}.
.
.
int Close(void *this)
{
AudioSoftDecoder *ad = (AudioSoftDecoder*)this;
if(!ad || !ad->privateData)
{
syslog(LOG_ERR , "%s(%d):Bad Parameter !!!\n" , __FUNCTION__ , __LINE__ );
return CT_ERROR_BAD_PARAMETER;
}
mpegMadPrivate *private = (mpegMadPrivate *)ad->privateData;
private->exit = TRUE;
if(private->decoderPid > 0)
{
pthread_join(private->decoderPid , NULL);
}
mad_decoder_finish(&private->decoder);
if(private->data.buffer)
{
free(private->data.buffer);
}
free(private);
ad->privateData = NULL;
return CT_ERROR_NO_ERROR;
}
int Control(void *this , U32 cmd ,void* param)
{
return CT_ERROR_NO_ERROR;
}
int MPEG_Init()
{
return RegisterAudioSoftDec(AudioDecType_MPEG ,&mpegModule);
}
C 语言实现多态的原理：函数指针,布布扣,bubuko.com
标签：style blog class code c int
原文地址：http://blog.csdn.net/philip_puma/article/details/25973139
