/**
* faaddec.c
* use faad library to decode aac, only can decode frame with adts head
*/#include #include #include "faad.h"
#define frame_max_len 1024*5
#define buffer_max_len 1024*1024
void show_usage()
/** * fetch one adts frame
*/int get_one_adts_frame(unsigned char* buffer, size_t buf_size, unsigned char* data ,size_t* data_size)
while(1)
if((buffer[0] == 0xff) && ((buffer[1] & 0xf0) == 0xf0) )
--buf_size;
++buffer;
}if(buf_size < size)
memcpy(data, buffer, size);
*data_size = size;
return 0;
}int main(int argc, char* argv)
; char src_file[128] = ;
char dst_file[128] = ;
file* ifile = null;
file* ofile = null;
unsigned long samplerate;
unsigned char channels;
neaacdechandle decoder = 0;
size_t data_size = 0;
size_t size = 0;
neaacdecframeinfo frame_info;
unsigned char* input_data = buffer;
unsigned char* pcm_data = null;
//analyse parameter
if(argc < 3)
sscanf(argv[1], "%s", src_file);
sscanf(argv[2], "%s", dst_file);
ifile = fopen(src_file, "rb");
ofile = fopen(dst_file, "wb");
if(!ifile || !ofile)
data_size = fread(buffer, 1, buffer_max_len, ifile);
//open decoder
decoder = neaacdecopen();
if(get_one_adts_frame(buffer, data_size, frame, &size) < 0)
//initialize decoder
neaacdecinit(decoder, frame, size, &samplerate, &channels);
printf("samplerate %d, channels %d\n", samplerate, channels);
while(get_one_adts_frame(input_data, data_size, frame, &size) == 0)
else if(pcm_data && frame_info.samples > 0)
data_size -= size;
input_data += size;
}
neaacdecclose(decoder);
fclose(ifile);
fclose(ofile);
return 0;
}
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