ref: 8d45c274c57be2acd0d21da9bffe48e1cddd0e0c
dir: /encoder.c/
#ifdef WIN32
#include <windows.h>
#endif
#include "aacenc.h"
#include "enc.h"
#include "rateconv.h"
////////////////////////////////////////////////////////////////////////////////
int write_ADIF_header(faacAACStream *as)
{
BsBitStream *bitHeader;
unsigned char headerBuf[20];
float seconds;
int i, bits, bytes;
static int SampleRates[] = {96000,88200,64000,48000,44100,32000,24000,22050,16000,12000,11025,8000,0};
seconds = (float)as->out_sampling_rate/(float)1024;
seconds = (float)as->cur_frame/seconds;
as->total_bits += 17 * 8;
bitHeader = BsOpenWrite(200);
for (i = 0; ; i++){
if (SampleRates[i] == as->out_sampling_rate)
break;
else if (SampleRates[i] == 0)
return FERROR;
}
// ADIF_Header
BsPutBit(bitHeader,'A',8);
BsPutBit(bitHeader,'D',8);
BsPutBit(bitHeader,'I',8);
BsPutBit(bitHeader,'F',8);
BsPutBit(bitHeader,0,1); // Copyright present
BsPutBit(bitHeader,0,1); // Original
BsPutBit(bitHeader,0,1); // Home
BsPutBit(bitHeader,0,1); // Bitstream type
BsPutBit(bitHeader,(int)(as->total_bits/seconds),23); // Bitrate
BsPutBit(bitHeader, 0, 4); // num program config elements
// ADIF_buffer_fulness
BsPutBit(bitHeader, 0, 20);
// program_config_element
BsPutBit(bitHeader,0,4);
BsPutBit(bitHeader,as->profile,2);
BsPutBit(bitHeader,i,4);
BsPutBit(bitHeader,1,4);
BsPutBit(bitHeader,0,4);
BsPutBit(bitHeader,0,4);
BsPutBit(bitHeader,0,2);
BsPutBit(bitHeader,0,3);
BsPutBit(bitHeader,0,4);
BsPutBit(bitHeader,0,1);
BsPutBit(bitHeader,0,1);
BsPutBit(bitHeader,0,1);
// element_list
BsPutBit(bitHeader,(as->channels == 2),1);
BsPutBit(bitHeader,0,4);
ByteAlign(bitHeader, 1);
// Comment
BsPutBit(bitHeader,0,8);
bits = BsBufferNumBit(bitHeader);
// Copy bitBuf into bitBuffer here
bytes = (int)((bits+7)/8);
for (i = 0; i < bytes; i++)
headerBuf[i] = bitHeader->data[i];
BsClose(bitHeader);
// Write header to a file
fseek(as->out_file, 0, SEEK_SET);
fwrite(headerBuf, 1, 17, as->out_file);
return FNO_ERROR;
}
////////////////////////////////////////////////////////////////////////////////
int faac_EncodeInit(faacAACStream *as, char *in_file, char *out_file)
{
int frameNumSample,delayNumSample;
int ch, frames, startupNumFrame;
SF_INFO sf_info;
if (as->raw_audio) {
sf_info.format = SF_FORMAT_RAW;
sf_info.format |= SF_FORMAT_PCM_BE;
sf_info.channels = 2;
sf_info.pcmbitwidth = 16;
sf_info.samplerate = 44100;
}
as->in_file = sf_open_read(in_file, &sf_info);
if (as->in_file == NULL)
return -1;
as->out_file = fopen(out_file, "wb");
if (as->out_file == NULL)
return -2;
frames = (int)(sf_info.samples/1024+0.5);
as->channels = sf_info.channels;
as->in_sampling_rate = sf_info.samplerate;
as->out_sampling_rate = (as->out_sampling_rate) ? (as->out_sampling_rate) : sf_info.samplerate;
as->cut_off = (as->cut_off) ? (as->cut_off) : ((as->out_sampling_rate)>>1);
if ((as->inputBuffer = (double**)malloc( as->channels*sizeof(double*))) == NULL)
return -3;
for (ch=0; ch < as->channels; ch++){
if ((as->inputBuffer[ch]=(double*)malloc( 1024*sizeof(double))) == NULL)
return -4;
}
as->bit_rate*=1000;
if((as->bit_rate % 1000)||(as->bit_rate < 16000))
return -5;
if (as->channels != 2)
return -6;
if ((as->profile != MAIN_PROFILE)&&(as->profile != LOW_PROFILE))
return -7;
as->total_bits = 0;
as->frames = 0;
as->cur_frame = 0;
as->is_first_frame = 1;
as->is_last_frames = 0;
if (as->in_sampling_rate != as->out_sampling_rate)
as->rc_needed = 1;
else
as->rc_needed = 0;
EncTfInit(as);
frameNumSample = 1024;
delayNumSample = 2*frameNumSample;
as->samplesToRead = frameNumSample * as->channels;
as->frame_bits = (int)(as->bit_rate*frameNumSample/as->out_sampling_rate+0.5);
as->bitBufferSize = (int)(((as->frame_bits * 5) + 7)/8);
/* num frames to start up encoder due to delay compensation */
startupNumFrame = (delayNumSample+frameNumSample-1)/frameNumSample;
/* process audio file frame by frame */
as->cur_frame = -startupNumFrame;
as->available_bits = 8184;
if (as->rc_needed) {
as->rc_buf = RateConvInit (0, /* in: debug level */
(double)as->out_sampling_rate/(double)as->in_sampling_rate, /* in: outputRate / inputRate */
as->channels, /* in: number of channels */
-1, /* in: num taps */
-1, /* in: alpha for Kaiser window */
-1, /* in: 6dB cutoff freq / input bandwidth */
-1, /* in: 100dB cutoff freq / input bandwidth */
&as->samplesToRead); /* out: num input samples / frame */
}
else
as->samplesToRead = 1024*as->channels;
as->savedSize = 0;
if (as->header_type == ADIF_HEADER) {
char tmp[17];
memset(tmp, 0, 17*sizeof(char));
fwrite(tmp, 1, 17, as->out_file);
}
as->sampleBuffer = (short*) malloc(as->samplesToRead*sizeof(short));
as->bitBuffer = (unsigned char*) malloc((as->bitBufferSize+100)*sizeof(char));
return frames;
}
////////////////////////////////////////////////////////////////////////////////
int faac_EncodeFrame(faacAACStream *as)
{
int i, j, error;
int usedNumBit, usedBytes;
int samplesOut, curSample = 0, Samples;
BsBitStream *bitBuf;
float *dataOut;
float *data = NULL;
int totalBytes = 0;
if (!as->is_last_frames){
Samples = sf_read_short(as->in_file, as->sampleBuffer, as->samplesToRead);
if (Samples < as->samplesToRead)
as->is_last_frames = 1;
}
else {
Samples = 0;
if(as->sampleBuffer){
free(as->sampleBuffer);
as->sampleBuffer = NULL;
}
}
// Is this the last (incomplete) frame
if ((Samples < as->samplesToRead)&&(Samples > 0)) {
// Padd with zeros
memset(as->sampleBuffer + Samples, 0, (as->samplesToRead-Samples)*sizeof(short));
}
if (as->rc_needed && (Samples > 0)) {
samplesOut = as->savedSize + RateConv (
as->rc_buf, /* in: buffer (handle) */
as->sampleBuffer, /* in: input data[] */
as->samplesToRead, /* in: number of input samples */
&dataOut);
data = (float*) malloc((samplesOut)*sizeof(float));
for (i = 0; i < as->savedSize; i++)
data[i] = as->saved[i];
for (j = 0; i < samplesOut; i++, j++)
data[i] = dataOut[j];
}
else if (Samples > 0) {
samplesOut = 1024*as->channels;
data = (float*) malloc((samplesOut)*sizeof(float));
for (i = 0; i < samplesOut; i++)
data[i] = as->sampleBuffer[i];
}
else
samplesOut = 1024*as->channels;
while(samplesOut >= 1024*as->channels) {
// Process Buffer
if (as->sampleBuffer) {
if (as->channels == 2) {
if (Samples > 0)
for (i = 0; i < 1024; i++) {
as->inputBuffer[0][i] = data[curSample+(i*2)];
as->inputBuffer[1][i] = data[curSample+(i*2)+1];
}
else // (Samples == 0) when called by faacEncodeFinish
for (i = 0; i < 1024; i++) {
as->inputBuffer[0][i] = 0;
as->inputBuffer[1][i] = 0;
}
}
else {
// No mono supported yet (basically only a problem with decoder
// the encoder in fact supports it).
return FERROR;
}
}
if (as->is_first_frame) {
EncTfFrame(as, (BsBitStream*)NULL);
as->is_first_frame = 0;
as->cur_frame++;
as->bitBufferSize = 0;
samplesOut -= (as->channels*1024);
curSample += (as->channels*1024);
continue;
}
bitBuf = BsOpenWrite(as->frame_bits * 10);
/* compute available number of bits */
/* frameAvailNumBit contains number of bits in reservoir */
/* variable bit rate: don't exceed bit reservoir size */
if (as->available_bits > 8184)
as->available_bits = 8184;
/* Add to frameAvailNumBit the number of bits for this frame */
as->available_bits += as->frame_bits;
/* Encode frame */
error = EncTfFrame(as, bitBuf);
if (error == FERROR)
return FERROR;
usedNumBit = BsBufferNumBit(bitBuf);
as->total_bits += usedNumBit;
// Copy bitBuf into bitBuffer here
usedBytes = (int)((usedNumBit+7)/8);
for (i = 0; i < usedBytes; i++)
as->bitBuffer[i+totalBytes] = bitBuf->data[i];
totalBytes += usedBytes;
BsClose(bitBuf);
/* Adjust available bit counts */
as->available_bits -= usedNumBit; /* Subtract bits used */
as->cur_frame++;
samplesOut -= (as->channels*1024);
curSample += (as->channels*1024);
}
as->bitBufferSize = totalBytes;
as->savedSize = samplesOut;
for (i = 0; i < samplesOut; i++)
as->saved[i] = data[curSample+i];
if (data)
free(data);
fwrite(as->bitBuffer, 1, as->bitBufferSize, as->out_file);
if (Samples < as->samplesToRead)
return F_FINISH;
else
return FNO_ERROR;
}
////////////////////////////////////////////////////////////////////////////////
void faac_EncodeFinish(faacAACStream *as)
{
faac_EncodeFrame(as);
faac_EncodeFrame(as);
}
////////////////////////////////////////////////////////////////////////////////
void faac_EncodeFree(faacAACStream *as)
{
int ch;
/* free encoder memory */
EncTfFree();
if (as->rc_needed)
RateConvFree (as->rc_buf);
for(ch=0; ch < as->channels; ch++)
if(as->inputBuffer[ch])
free(as->inputBuffer[ch]);
if(as->inputBuffer)
free(as->inputBuffer);
if (as->header_type == ADIF_HEADER)
write_ADIF_header(as);
sf_close(as->in_file);
fclose(as->out_file);
if (as->bitBuffer)
free(as->bitBuffer);
}
////////////////////////////////////////////////////////////////////////////////
faacVersion *faac_Version(void)
{
faacVersion *faacv = malloc(sizeof(faacVersion));
faacv->DLLMajorVersion = 2;
faacv->DLLMinorVersion = 30;
faacv->MajorVersion = 0;
faacv->MinorVersion = 70;
strcpy(faacv->HomePage, "http://www.slimline.net/aac/");
return faacv;
}
////////////////////////////////////////////////////////////////////////////////
void faac_InitParams(faacAACStream *as)
{
as->profile = MAIN_PROFILE;
as->header_type = ADTS_HEADER;
as->use_IS = 0;
as->use_MS = 0;
as->use_TNS = 0;
as->use_LTP = 1;
as->use_PNS = 0;
as->cut_off = 0;
as->bit_rate = 128;
as->out_sampling_rate = 0;
as->raw_audio = 0;
}
////////////////////////////////////////////////////////////////////////////////
void faac_SetParam(faacAACStream *as, int param, int value)
{
switch (param){
case PROFILE:
as->profile = value;
break;
case HEADER_TYPE:
as->header_type = value;
break;
case MS_STEREO:
as->use_MS = value;
break;
case IS_STEREO:
as->use_IS = value;
break;
case BITRATE:
as->bit_rate = value;
break;
case CUT_OFF:
as->cut_off = value;
break;
case OUT_SAMPLING_RATE:
as->out_sampling_rate = value;
break;
case RAW_AUDIO:
as->raw_audio = value;
break;
case TNS:
as->use_TNS = value;
break;
case LTP:
as->use_LTP = value;
break;
case PNS:
as->use_PNS = value;
break;
}
}
////////////////////////////////////////////////////////////////////////////////