aac2pcm.tgz

#include <stdio.h> #include <memory.h> #include "faad.h" #include <string> #include <iostream> #include <stdlib.h> #define FRAME_MAX_LEN 1024*5 #define BUFFER_MAX_LEN 1024*1024 using namespace std; /** * * fetch one ADTS frame * */ int get_one_ADTS_frame(unsigned char* buffer, size_t buf_size, unsigned char* data ,size_t* data_size) { size_t size = 0; if(!buffer || !data || !data_size ) { return -1; } while(1) { if(buf_size < 7 ) { return -1; } if((buffer[0] == 0xff) && ((buffer[1] & 0xf0) == 0xf0) ) { size |= ((buffer[3] & 0x03) <<11); //high 2 bit size |= buffer[4]<<3; //middle 8 bit size |= ((buffer[5] & 0xe0)>>5); //low 3bit break; } --buf_size; ++buffer; } if(buf_size < size) { return -1; } memcpy(data, buffer, size); *data_size = size; return 0; } int main(int argc, char* argv[]) { static unsigned char frame[FRAME_MAX_LEN]; static unsigned char buffer[BUFFER_MAX_LEN] = {0}; static unsigned char frame_mono[BUFFER_MAX_LEN]; char src_file[128] = {0}; char dst_file[128] = {0}; 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; //ifile = fopen("/usr/local/nginx/html/MP4/aac/151869402028019501/20180105/151869402028019501_20180105171732.aac","rb"); ifile = fopen("tdjm.aac","rb"); ofile = fopen("2.pcm","wb"); data_size = fread(buffer, 1, BUFFER_MAX_LEN, ifile); printf("the data_size is :%d\n", data_size); decoder = NeAACDecOpen(); if(get_one_ADTS_frame(buffer, data_size, frame, &size) < 0) { return -1; } NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(decoder); conf->defObjectType = LC; conf->outputFormat = FAAD_FMT_16BIT; conf->dontUpSampleImplicitSBR = 1; NeAACDecSetConfiguration(decoder,conf); 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) { pcm_data = (unsigned char*)NeAACDecDecode(decoder, &frame_info, frame, size); if(frame_info.error > 0) { printf("%s\n",NeAACDecGetErrorMessage(frame_info.error)); } else if(pcm_data && frame_info.samples > 0) { printf("frame info: bytesconsumed %d, channels %d, header_type %d\ object_type %d, samples %d, samplerate %d\n", frame_info.bytesconsumed, frame_info.channels, frame_info.header_type, frame_info.object_type, frame_info.samples, frame_info.samplerate); int i,j; //read the data from the two channels for(i=0, j=0; i<4096&&j<2048;i+=4, j+=2) { frame_mono[j] = pcm_data[i]; frame_mono[j+1] = pcm_data[i+1]; } //fwrite(frame_mono, 1, frame_info.samples, ofile); //2个通道 fwrite(frame_mono, 1, frame_info.samples, ofile); //fwrite(pcm_data, 1, frame_info.samples*frame_info.channels, ofile); fflush(ofile); } data_size -= size; input_data += size; } NeAACDecClose(decoder); fclose(ifile); fclose(ofile); return 0; }