#include <memory.h>
#include <stdlib.h>
#include "faad.h"
#include <stdbool.h>
#include <string.h>
#include <emscripten.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/timeb.h>
#include <unistd.h>

bool hasInit = false;

NeAACDecHandle decoder = 0;
NeAACDecFrameInfo frame_info;

void PrintArry(unsigned char *buffer, unsigned int size)
{
	int i;
	char data[1024*1024];
	
	for(i = 0;i < size;i++)
	{
		data[i] = buffer[i];
	}
	
	data[i + 1] = '\0';
}

int init_decoder(unsigned char* inBuffer, size_t size)
{  
    unsigned char channels;
    unsigned long sampleRate;
    
    memset(&frame_info, 0, sizeof(frame_info));
    decoder = NeAACDecOpen();
    NeAACDecInit(decoder, inBuffer, size, &sampleRate, &channels);
    //printf("init_decoder初始化完毕\n");
    hasInit = true;
    return 0;
}

int feedData(unsigned char* out_data, unsigned char* buffer, unsigned int size)
{
	int ret = 0;
	
    if (!hasInit)
    {
        init_decoder(buffer, size);
    }

    unsigned char *out_buffer = (unsigned char*)NeAACDecDecode(decoder, &frame_info, buffer, size);
	//printf("frame_info.error %d\n",frame_info.error);

    if (frame_info.error > 0)
    {		
        return frame_info.error;
    }
    else if(out_buffer && frame_info.samples > 0)//解码成功
    {
		ret = frame_info.samples * frame_info.channels;
		for(int i = 0;i < ret;i++)
		{
			 out_data[i] = out_buffer[i];
		}
    }

    return ret;
}

void destroyDecoder()
{
	hasInit = false;
    NeAACDecClose(decoder);
}

/*bool GetFrame(FILE *file, unsigned char *input, int *len, int *pos)
{
    int readByte;
    int frameLen = 0;
    unsigned char buffer[6];

    while ((readByte = fread(buffer, 1, 6, file)) > 0)
    {
        if ((buffer[0] == 0xff) && ((buffer[1] & 0xf0) == 0xf0))
        {         
            frameLen = ((buffer[3] & 0x3) << 11) | ((buffer[4]) << 3) | ((buffer[5]) >> 5);
            printf("帧长度 %d\n", frameLen);
            *len = frameLen;
            fseek(file, *pos, SEEK_SET);
            fread(input, 1, frameLen, file);
            *pos = *pos + frameLen;
            return true;
        }
        else
        {
            printf("位置没找对\n");
        }
    }

    return false;
}

int main(int argc, char* argv[])
{
    int len;
    int pos = 0;
    unsigned char buffer[4096] = {0};
    unsigned char OutBuffer[10240];
    unsigned char* pcmData = OutBuffer;
    FILE* file = fopen("test.aac", "rb");
	if(!file)
	{
		printf("找不到AAC文件\n");
		return -1;
	}
	
    outFile = fopen("shchu.pcm", "wb+");

    while (GetFrame(file, buffer, &len, &pos))
    {
        feed_data(pcmData, buffer, len);     
    }

    fclose(file);
	fclose(outFile);
	destroy_decoder();
	printf("解码完毕\n");
    return 0;
}*/