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| #include <stdio.h>
#include <stdlib.h>
#include <string.h>
int getAdslFrame(unsigned char* buffer, int buf_size, unsigned char* data ,int* data_size){
int size = 0;
//如果这两个为空,说明异常了.
if(buffer == NULL || data == NULL) return -1;
for(;;){
//buf_size 小于７不满足syncword的要求，异常
if(buf_size < 7)
return -1;
//满足这个条件就说明这是一个 syncword
if((buffer[0] == 0xff) && ((buffer[1] & 0xf0) == 0xf0)){
//获取大小
size |= ((buffer[3] & 0x03) << 11);
size |= buffer[4] << 3;
size |= (buffer[5] & 0xe0) >> 5;
break;
}
--buf_size;
++buffer;
}
//需要修正指针位置
if(buf_size < size) return 1;
//拷贝内存指针
memcpy(data, buffer, size);
*data_size = size; //将大小赋值给data_size
return 0;//正常返回
}
int main() {
FILE *fp_log = fopen("../aac/log.txt", "wb+");//日志输出文件
FILE *fp = fopen("../aac/source.aac", "rb+");//aac源文件
unsigned char *aacframe = (unsigned char*)malloc(1024 * 5); //创建可能的一帧大小
unsigned char *aacbuffer = (unsigned char*)malloc(1024 * 1024); //创建缓存
printf("-----+- ADTS Frame Table -+------+\n");
fprintf(fp_log, "-----+- ADTS Frame Table -+------+\n");
printf(" NUM | Profile | Frequency| Size |\n");
fprintf(fp_log, " NUM | Profile | Frequency| Size |\n");
printf("-----+---------+----------+------+\n");
fprintf(fp_log, "-----+---------+----------+------+\n");
int offset = 0, size, cnt;
while(!feof(fp)){
int data_size = fread(aacbuffer + offset, 1, 1024 * 1024 - offset, fp);//尝试读取一个可能的缓存大小
unsigned char* input_data = aacbuffer; //保存一下头指针
for(;;){
int ret = getAdslFrame(input_data, data_size, aacframe, &size); //读取一帧,返回读取成功还是失败
if(ret == -1) break;//失败
else if (ret == 1) {//修正指针位置
memcpy(aacbuffer, input_data, data_size);
offset = data_size;
break;
}
//读取成功
char profile_str[10] = {0};
char frequence_str[10] = {0};
unsigned char profile = aacframe[2] & 0xC0;
profile = profile >> 6;
switch(profile){
case 0: sprintf(profile_str,"Main");break;
case 1: sprintf(profile_str,"LC");break;
case 2: sprintf(profile_str,"SSR");break;
default:sprintf(profile_str,"unknown");break;
}
unsigned char sampling_frequency_index = aacframe[2] & 0x3C;
sampling_frequency_index = sampling_frequency_index >> 2;
//采样率
switch(sampling_frequency_index){
case 0: sprintf(frequence_str,"96000Hz");break;
case 1: sprintf(frequence_str,"88200Hz");break;
case 2: sprintf(frequence_str,"64000Hz");break;
case 3: sprintf(frequence_str,"48000Hz");break;
case 4: sprintf(frequence_str,"44100Hz");break;
case 5: sprintf(frequence_str,"32000Hz");break;
case 6: sprintf(frequence_str,"24000Hz");break;
case 7: sprintf(frequence_str,"22050Hz");break;
case 8: sprintf(frequence_str,"16000Hz");break;
case 9: sprintf(frequence_str,"12000Hz");break;
case 10: sprintf(frequence_str,"11025Hz");break;
case 11: sprintf(frequence_str,"8000Hz");break;
default:sprintf(frequence_str,"unknown");break;
}
//打印输出一帧的信息
fprintf(fp_log, "%5d| %8s| %8s| %5d|\n", cnt, profile_str, frequence_str, size);
printf("%5d| %8s| %8s| %5d|\n", cnt, profile_str, frequence_str, size);
data_size -= size;
input_data += size;
cnt++;
}
}
//释放资源
fclose(fp);
fclose(fp_log);
free(aacbuffer);
free(aacframe);
return 0;
}
|
