ref: 11af283c2493c1b03adcc5d668f4b1a415178883
dir: /aac_se_enc.c/
/*
* Writing/counting AAC syntactic elements
*
* Copyright (c) 1999 M. Bakker
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/**************************************************************************
Version Control Information Method: CVS
Identifiers:
$Revision: 1.15 $
$Date: 2000/11/01 14:05:32 $ (check in)
$Author: menno $
*************************************************************************/
#include "aac_se_enc.h"
#include "quant.h"
#include "huffman.h"
int max_pred_sfb;
/*****************************************************************************/
/* WriteAACFillBits(...) */
/* Write fill_elements to the bitstream. */
/* Number of bits written is LEN_SE_ID + FIL_COUNT_LEN + a multiple of 8. */
/* Return number of bits left over (less than 7 ). */
/*****************************************************************************/
int WriteAACFillBits(BsBitStream* ptrBs, /* Pointer to bitstream */
int numBits, /* Number of bits needed to fill */
int writeFlag)
{
int numberOfBitsLeft=numBits;
/* Need at least (LEN_SE_ID + LEN_F_CNT) bits for a fill_element */
int minNumberOfBits = LEN_SE_ID + LEN_F_CNT;
while (numberOfBitsLeft>=minNumberOfBits) {
int numberOfBytes;
int maxCount;
if (writeFlag) {
BsPutBit(ptrBs,ID_FIL,LEN_SE_ID); /* Write fill_element ID */
}
numberOfBitsLeft-=minNumberOfBits; /* Subtract for ID,count */
numberOfBytes=(int)(numberOfBitsLeft/LEN_BYTE);
maxCount = (1<<LEN_F_CNT) - 1; /* Max count without escaping */
/* if we have less than maxCount bytes, write them now */
if (numberOfBytes<maxCount) {
int i;
if (writeFlag) {
BsPutBit(ptrBs,numberOfBytes,LEN_F_CNT);
for (i=0;i<numberOfBytes;i++) {
BsPutBit(ptrBs,0,LEN_BYTE);
}
}
/* otherwise, we need to write an escape count */
}
else {
int maxEscapeCount,maxNumberOfBytes,escCount;
int i;
if (writeFlag) {
BsPutBit(ptrBs,maxCount,LEN_F_CNT);
}
maxEscapeCount = (1<<LEN_BYTE) - 1; /* Max escape count */
maxNumberOfBytes = maxCount + maxEscapeCount;
numberOfBytes = (numberOfBytes > maxNumberOfBytes ) ? (maxNumberOfBytes) : (numberOfBytes);
escCount = numberOfBytes - maxCount;
if (writeFlag) {
BsPutBit(ptrBs,escCount,LEN_BYTE);
for (i=0;i<numberOfBytes-1;i++) {
BsPutBit(ptrBs,0,LEN_BYTE);
}
}
}
numberOfBitsLeft -= LEN_BYTE*numberOfBytes;
}
return numberOfBitsLeft;
}
int WriteADTSHeader(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
BsBitStream* fixedStream, /* Pointer to bitstream */
int used_bits,
int writeFlag) /* 1 means write, 0 means count only */
{
if (writeFlag) {
/* Fixed ADTS header */
BsPutBit(fixedStream, 0xFFFF, 12); // 12 bit Syncword
BsPutBit(fixedStream, 1, 1); // ID
BsPutBit(fixedStream, 0, 2); // layer
BsPutBit(fixedStream, 1, 1); // protection absent
BsPutBit(fixedStream, quantInfo->profile, 2); // profile
BsPutBit(fixedStream, quantInfo->srate_idx, 4); // sampling rate
BsPutBit(fixedStream, 0, 1); // private bit
BsPutBit(fixedStream, 1, 3); // ch. config (must be > 0)
BsPutBit(fixedStream, 0, 1); // original/copy
BsPutBit(fixedStream, 0, 1); // home
BsPutBit(fixedStream, 0, 2); // emphasis
/* Variable ADTS header */
BsPutBit(fixedStream, 0, 1); // copyr. id. bit
BsPutBit(fixedStream, 0, 1); // copyr. id. start
BsPutBit(fixedStream, bit2byte(used_bits), 13); // number of bits
BsPutBit(fixedStream, 0x7FF, 11); // buffer fullness (0x7FF for VBR)
BsPutBit(fixedStream, 0, 2); // raw data blocks (0+1=1)
}
return 58;
}
/*****************************************************************************/
/* WriteSCE(...), write a single-channel element to the bitstream. */
/*****************************************************************************/
int WriteSCE(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
int tag,
BsBitStream* fixedStream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int bit_count=0;
if (writeFlag) {
/* write ID_SCE, single_element_channel() identifier */
BsPutBit(fixedStream,ID_SCE,LEN_SE_ID);
/* write the element_identifier_tag */
BsPutBit(fixedStream,tag,LEN_TAG);
}
bit_count += LEN_SE_ID;
bit_count += LEN_TAG;
/* Write an individual_channel_stream element */
bit_count += WriteICS(quantInfo,0,fixedStream,writeFlag);
return bit_count;
}
/*****************************************************************************/
/* WriteLFE(...), write a lfe-channel element to the bitstream. */
/*****************************************************************************/
int WriteLFE(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
int tag,
BsBitStream* fixedStream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int bit_count=0;
if (writeFlag) {
/* write ID_LFE, lfe_element_channel() identifier */
BsPutBit(fixedStream,ID_LFE,LEN_SE_ID);
/* write the element_identifier_tag */
BsPutBit(fixedStream,tag,LEN_TAG);
}
bit_count += LEN_SE_ID;
bit_count += LEN_TAG;
/* Write an individual_channel_stream element */
bit_count += WriteICS(quantInfo,0,fixedStream,writeFlag);
return bit_count;
}
/*****************************************************************************/
/* WriteCPE(...), write a channel_pair_element to the bitstream. */
/*****************************************************************************/
int WriteCPE(AACQuantInfo* quantInfoL, /* AACQuantInfo structure, left */
AACQuantInfo* quantInfoR, /* AACQuantInfo structure, right */
int tag,
int commonWindow, /* common_window flag */
MS_Info* ms_info, /* MS stereo information */
BsBitStream* fixedStream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int bit_count=0;
if (writeFlag) {
/* write ID_CPE, single_element_channel() identifier */
BsPutBit(fixedStream,ID_CPE,LEN_SE_ID);
/* write the element_identifier_tag */
BsPutBit(fixedStream,tag,LEN_TAG); /* Currently, this is zero */
/* common_window? */
BsPutBit(fixedStream,commonWindow,LEN_COM_WIN);
}
bit_count += LEN_SE_ID;
bit_count += LEN_TAG;
bit_count += LEN_COM_WIN;
/* if common_window, write ics_info */
if (commonWindow) {
int numWindows,maxSfb;
bit_count += WriteICSInfo(quantInfoL,fixedStream,writeFlag);
numWindows=quantInfoL->num_window_groups;
maxSfb = quantInfoL->max_sfb;
if (writeFlag) {
BsPutBit(fixedStream,ms_info->is_present,LEN_MASK_PRES);
if (ms_info->is_present==1) {
int g;
int b;
for (g=0;g<numWindows;g++) {
for (b=0;b<maxSfb;b++) {
BsPutBit(fixedStream,ms_info->ms_used[g*maxSfb+b],LEN_MASK);
}
}
}
}
bit_count += LEN_MASK_PRES;
if (ms_info->is_present==1)
bit_count += (numWindows*maxSfb*LEN_MASK);
}
/* Write individual_channel_stream elements */
bit_count += WriteICS(quantInfoL,commonWindow,fixedStream,writeFlag);
bit_count += WriteICS(quantInfoR,commonWindow,fixedStream,writeFlag);
return bit_count;
}
/*****************************************************************************/
/* WriteICS(...), write an individual_channel_stream element to the bitstream.*/
/*****************************************************************************/
int WriteICS(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
int commonWindow, /* Common window flag */
BsBitStream* fixed_stream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
/* this function writes out an individual_channel_stream to the bitstream and */
/* returns the number of bits written to the bitstream */
int bit_count = 0;
// int output_book_vector[MAX_SCFAC_BANDS*2];
writeFlag = ( writeFlag != 0 );
/* Write the 8-bit global_gain */
BsPutBit(fixed_stream,quantInfo->common_scalefac,writeFlag*LEN_GLOB_GAIN);
bit_count += LEN_GLOB_GAIN;
/* Write ics information */
if (!commonWindow) {
bit_count += WriteICSInfo(quantInfo,fixed_stream,writeFlag);
}
/* Write section_data() information to the bitstream */
// bit_count += sort_book_numbers(quantInfo,output_book_vector,fixed_stream,writeFlag);
bit_count += sort_book_numbers(quantInfo,fixed_stream,writeFlag);
/* Write scale_factor_data() information */
bit_count += write_scalefactor_bitstream(fixed_stream,writeFlag,quantInfo);
/* Write pulse_data() */
bit_count += WritePulseData(quantInfo,fixed_stream,writeFlag);
/* Write TNS data */
bit_count += WriteTNSData(quantInfo,fixed_stream,writeFlag);
/* Write gain control data */
bit_count += WriteGainControlData(fixed_stream,writeFlag);
/* Write out spectral_data() */
bit_count += WriteSpectralData(quantInfo,fixed_stream,writeFlag);
/* Return number of bits */
return(bit_count);
}
/*****************************************************************************/
/* WriteICSInfo(...), write individual_channel_stream information */
/* to the bitstream. */
/*****************************************************************************/
int WriteICSInfo(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
BsBitStream* fixed_stream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int grouping_bits;
int max_sfb;
int bit_count = 0;
/* Compute number of scalefactor bands */
// if (quantInfo->max_sfb*quantInfo->num_window_groups != quantInfo->nr_of_sfb)
//CommonExit(-1,"Wrong number of scalefactorbands");
max_sfb = quantInfo->max_sfb;
if (writeFlag) {
/* write out ics_info() information */
BsPutBit(fixed_stream,0,LEN_ICS_RESERV); /* reserved Bit*/
/* Write out window sequence */
BsPutBit(fixed_stream,quantInfo->block_type,LEN_WIN_SEQ); /* short window */
/* Write out window shape */
BsPutBit(fixed_stream,quantInfo->window_shape,LEN_WIN_SH); /* window shape */
}
bit_count += LEN_ICS_RESERV;
bit_count += LEN_WIN_SEQ;
bit_count += LEN_WIN_SH;
/* For short windows, write out max_sfb and scale_factor_grouping */
if (quantInfo -> block_type == ONLY_SHORT_WINDOW){
if (writeFlag) {
BsPutBit(fixed_stream,max_sfb,LEN_MAX_SFBS);
grouping_bits = find_grouping_bits(quantInfo->window_group_length,quantInfo->num_window_groups);
BsPutBit(fixed_stream,grouping_bits,MAX_SHORT_WINDOWS - 1); /* the grouping bits */
}
bit_count += LEN_MAX_SFBS;
bit_count += MAX_SHORT_WINDOWS - 1;
}
/* Otherwise, write out max_sfb and predictor data */
else { /* block type is either start, stop, or long */
if (writeFlag) {
BsPutBit(fixed_stream,max_sfb,LEN_MAX_SFBL);
}
bit_count += LEN_MAX_SFBL;
bit_count += WriteLTP_PredictorData(quantInfo,fixed_stream,writeFlag);
}
return bit_count;
}
/*****************************************************************************/
/* WriteLTP_PredictorData(...), write LTP predictor data. */
/*****************************************************************************/
int WriteLTP_PredictorData(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
BsBitStream* fixed_stream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int bit_count = 0;
bit_count += ltp_encode (quantInfo, fixed_stream, writeFlag);
return (bit_count);
}
/*****************************************************************************/
/* WritePulseData(...), write pulse data. */
/*****************************************************************************/
int WritePulseData(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
BsBitStream* fixed_stream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int i, bit_count = 0;
if (quantInfo->pulseInfo.pulse_data_present) {
if (writeFlag) {
BsPutBit(fixed_stream,1,LEN_PULSE_PRES); /* no pulse_data_present */
BsPutBit(fixed_stream,quantInfo->pulseInfo.number_pulse,LEN_NEC_NPULSE); /* no pulse_data_present */
BsPutBit(fixed_stream,quantInfo->pulseInfo.pulse_start_sfb,LEN_NEC_ST_SFB); /* no pulse_data_present */
}
bit_count += (LEN_NEC_NPULSE + LEN_NEC_ST_SFB);
for (i = 0; i < quantInfo->pulseInfo.number_pulse+1; i++) {
if (writeFlag) {
BsPutBit(fixed_stream,quantInfo->pulseInfo.pulse_offset[i],LEN_NEC_POFF);
BsPutBit(fixed_stream,quantInfo->pulseInfo.pulse_amp[i],LEN_NEC_PAMP);
}
bit_count += (LEN_NEC_POFF + LEN_NEC_PAMP);
}
}
else {
if (writeFlag) {
BsPutBit(fixed_stream,0,LEN_PULSE_PRES); /* no pulse_data_present */
}
}
bit_count += LEN_PULSE_PRES;
return bit_count;
}
/*****************************************************************************/
/* WriteTNSData(...), write TNS data. */
/*****************************************************************************/
int WriteTNSData(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
BsBitStream* fixed_stream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int bit_count = 0;
int numWindows;
int len_tns_nfilt;
int len_tns_length;
int len_tns_order;
int filtNumber;
int resInBits;
int bitsToTransmit;
unsigned long unsignedIndex;
int w;
TNS_INFO* tnsInfoPtr = &quantInfo->tnsInfo;
if (writeFlag) {
BsPutBit(fixed_stream,tnsInfoPtr->tnsDataPresent,LEN_TNS_PRES);
}
bit_count += LEN_TNS_PRES;
/* If TNS is not present, bail */
if (!tnsInfoPtr->tnsDataPresent) {
return bit_count;
}
/* Set window-dependent TNS parameters */
if (quantInfo->block_type == ONLY_SHORT_WINDOW) {
numWindows = MAX_SHORT_WINDOWS;
len_tns_nfilt = LEN_TNS_NFILTS;
len_tns_length = LEN_TNS_LENGTHS;
len_tns_order = LEN_TNS_ORDERS;
}
else {
numWindows = 1;
len_tns_nfilt = LEN_TNS_NFILTL;
len_tns_length = LEN_TNS_LENGTHL;
len_tns_order = LEN_TNS_ORDERL;
}
/* Write TNS data */
bit_count += (numWindows * len_tns_nfilt);
for (w=0;w<numWindows;w++) {
TNS_WINDOW_DATA* windowDataPtr = &tnsInfoPtr->windowData[w];
int numFilters = windowDataPtr->numFilters;
if (writeFlag) {
BsPutBit(fixed_stream,numFilters,len_tns_nfilt); /* n_filt[] = 0 */
}
if (numFilters) {
bit_count += LEN_TNS_COEFF_RES;
resInBits = windowDataPtr->coefResolution;
if (writeFlag) {
BsPutBit(fixed_stream,resInBits-DEF_TNS_RES_OFFSET,LEN_TNS_COEFF_RES);
}
bit_count += numFilters * (len_tns_length+len_tns_order);
for (filtNumber=0;filtNumber<numFilters;filtNumber++) {
TNS_FILTER_DATA* tnsFilterPtr=&windowDataPtr->tnsFilter[filtNumber];
int order = tnsFilterPtr->order;
if (writeFlag) {
BsPutBit(fixed_stream,tnsFilterPtr->length,len_tns_length);
BsPutBit(fixed_stream,order,len_tns_order);
}
if (order) {
bit_count += (LEN_TNS_DIRECTION + LEN_TNS_COMPRESS);
if (writeFlag) {
BsPutBit(fixed_stream,tnsFilterPtr->direction,LEN_TNS_DIRECTION);
BsPutBit(fixed_stream,tnsFilterPtr->coefCompress,LEN_TNS_COMPRESS);
}
bitsToTransmit = resInBits - tnsFilterPtr->coefCompress;
bit_count += order * bitsToTransmit;
if (writeFlag) {
int i;
for (i=1;i<=order;i++) {
unsignedIndex = (unsigned long) (tnsFilterPtr->index[i])&(~(~0<<bitsToTransmit));
BsPutBit(fixed_stream,unsignedIndex,bitsToTransmit);
}
}
}
}
}
}
return bit_count;
}
/*****************************************************************************/
/* WriteGainControlData(...), write gain control data. */
/*****************************************************************************/
int WriteGainControlData(BsBitStream* fixed_stream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int bit_count = 0;
bit_count += LEN_GAIN_PRES;
if (writeFlag) {
BsPutBit(fixed_stream,0,LEN_GAIN_PRES);
}
return bit_count;
}
/*****************************************************************************/
/* WriteSpectralData(...), write spectral data. */
/*****************************************************************************/
int WriteSpectralData(AACQuantInfo* quantInfo, /* AACQuantInfo structure */
BsBitStream* fixed_stream, /* Pointer to bitstream */
int writeFlag) /* 1 means write, 0 means count only */
{
int bit_count = 0;
int numSpectral = quantInfo->spectralCount;
/* set up local pointers to data and len */
/* data array contains data to be written */
/* len array contains lengths of data words */
int* data = quantInfo -> data;
int* len = quantInfo -> len;
if (writeFlag) {
int i;
for(i=0;i<numSpectral;i++) {
if (len[i] > 0) { /* only send out non-zero codebook data */
BsPutBit(fixed_stream,data[i],len[i]); /* write data */
bit_count += len[i]; /* update bit_count */
}
}
}
else {
int i;
for(i=0;i<numSpectral;i++) {
bit_count += len[i]; /* update bit_count */
}
}
return bit_count;
}