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PackUtils.hx
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PackUtils.hx
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/*
** PackUtils.hx
**
** Copyright (c) 2011-2017 Peter McQuillan
**
** All Rights Reserved.
**
** Distributed under the BSD Software License (see license.txt)
**
*/
class PackUtils
{
//////////////////////////////// local tables ///////////////////////////////
// These two tables specify the characteristics of the decorrelation filters.
// Each term represents one layer of the sequential filter, where positive
// values indicate the relative sample involved from the same channel (1=prev),
// 17 & 18 are special functions using the previous 2 samples, and negative
// values indicate cross channel decorrelation (in stereo only).
static var very_high_terms:Array < Int >= [ 18, 18, 2, 3, -2, 18, 2, 4, 7, 5, 3, 6, 8, -1, 18, 2, 0];
static var high_terms:Array < Int >= [ 18, 18, 18, -2, 2, 3, 5, -1, 17, 4, 0];
static var default_terms:Array < Int >= [ 18, 18, 2, 17, 3, 0];
static var fast_terms:Array < Int >= [ 18, 17, 0];
///////////////////////////// executable code ////////////////////////////////
// This function initializes everything required to pack WavPack bitstreams
// and must be called BEFORE any other function in this module.
public static function pack_init(wpc:WavpackContext):Void {
var wps:WavpackStream= wpc.stream;
var flags:Int = wps.wphdr.flags;
var term_string:Array<Dynamic>;
var dpp_idx:Int= 0;
var ti:Int;
wps.sample_index = 0;
if((flags & Defines.HYBRID_SHAPE) !=0 )
{
var weight:Int= wpc.config.shaping_weight;
if (weight <= -1000)
{
weight = -1000;
}
wps.dc.shaping_acc[1] = weight << 16;
wps.dc.shaping_acc[0] = wps.dc.shaping_acc[1];
}
if((wpc.config.flags & Defines.CONFIG_VERY_HIGH_FLAG) != 0 )
{
term_string = very_high_terms;
}
else if((wpc.config.flags & Defines.CONFIG_HIGH_FLAG) != 0 )
{
term_string = high_terms;
}
else if((wpc.config.flags & Defines.CONFIG_FAST_FLAG) != 0 )
{
term_string = fast_terms;
}
else
{
term_string = default_terms;
}
for (ti in 0...(term_string.length - 1))
{
if ((term_string[ti] >= 0) || ((flags & Defines.CROSS_DECORR) != 0 ))
{
wps.decorr_passes[dpp_idx].term = term_string[ti];
wps.decorr_passes[dpp_idx].delta = 2;
dpp_idx++;
}
else if((flags & Defines.MONO_FLAG) == 0 )
{
wps.decorr_passes[dpp_idx].term = -3;
wps.decorr_passes[dpp_idx].delta = 2;
dpp_idx++;
}
}
wps.num_terms = dpp_idx;
WordsUtils.init_words(wps);
}
// Allocate room for and copy the decorrelation terms from the decorr_passes
// array into the specified metadata structure. Both the actual term id and
// the delta are packed into single characters.
static function write_decorr_terms(wps:WavpackStream, wpmd:WavpackMetadata):Void {
var tcount:Int;
var byteptr:Array<Int> = new Array();
var byte_idx:Int= 0;
var dpp_idx:Int= 0;
wpmd.id = Defines.ID_DECORR_TERMS;
tcount = wps.num_terms;
while (tcount > 0)
{
byteptr[byte_idx] = ((((wps.decorr_passes[dpp_idx].term + 5) & 0x1f) | ((wps.decorr_passes[dpp_idx].delta << 5) & 0xe0)));
byte_idx++;
tcount--;
++dpp_idx;
}
wpmd.byte_length = byte_idx;
wpmd.data = byteptr;
}
// Allocate room for and copy the decorrelation term weights from the
// decorr_passes array into the specified metadata structure. The weights
// range +/-1024, but are rounded and truncated to fit in signed chars for
// metadata storage. Weights are separate for the two channels
static function write_decorr_weights(wps:WavpackStream, wpmd:WavpackMetadata):Void {
var tcount:Int;
var i:Int;
var byteptr:Array<Int> = new Array();
var byte_idx:Int= 0;
wpmd.id = Defines.ID_DECORR_WEIGHTS;
i = wps.num_terms - 1;
while (i >= 0)
{
if ((WordsUtils.store_weight(wps.decorr_passes[i].weight_A) != 0) || ((wps.wphdr.flags & Defines.FALSE_STEREO_OR_MONO_FLAG) == 0) &&
(WordsUtils.store_weight(wps.decorr_passes[i].weight_B) != 0))
{
break;
}
--i;
}
tcount = i + 1;
for (i in 0...wps.num_terms)
{
if (i < tcount)
{
byteptr[byte_idx] = WordsUtils.store_weight(wps.decorr_passes[i].weight_A);
wps.decorr_passes[i].weight_A = WordsUtils.restore_weight(byteptr[byte_idx]);
byte_idx++;
if((wps.wphdr.flags & Defines.FALSE_STEREO_OR_MONO_FLAG) == 0 )
{
byteptr[byte_idx] = WordsUtils.store_weight(wps.decorr_passes[i].weight_B);
wps.decorr_passes[i].weight_B = WordsUtils.restore_weight(byteptr[byte_idx]);
byte_idx++;
}
}
else
{
wps.decorr_passes[i].weight_A = wps.decorr_passes[i].weight_B = 0;
}
}
wpmd.byte_length = byte_idx;
wpmd.data = byteptr;
}
// Allocate room for and copy the decorrelation samples from the decorr_passes
// array into the specified metadata structure. The samples are signed 32-bit
// values, but are converted to signed log2 values for storage in metadata.
// Values are stored for both channels and are specified from the first term
// with unspecified samples set to zero. The number of samples stored varies
// with the actual term value, so those must obviously be specified before
// these in the metadata list. Any number of terms can have their samples
// specified from no terms to all the terms, however I have found that
// sending more than the first term's samples is a waste. The "wcount"
// variable can be set to the number of terms to have their samples stored.
static function write_decorr_samples(wps:WavpackStream, wpmd:WavpackMetadata):Void {
var tcount:Int;
var wcount:Int= 1;
var temp:Int;
var byteptr:Array<Int> = new Array();
var byte_idx:Int= 0;
var dpp_idx:Int= 0;
wpmd.id = Defines.ID_DECORR_SAMPLES;
tcount = wps.num_terms;
while (tcount > 0)
{
if (wcount != 0)
{
if (wps.decorr_passes[dpp_idx].term > Defines.MAX_TERM)
{
wps.decorr_passes[dpp_idx].samples_A[0] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.decorr_passes[dpp_idx].samples_A[0]));
byteptr[byte_idx] = temp & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
byteptr[byte_idx] = (temp >> 8) & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
wps.decorr_passes[dpp_idx].samples_A[1] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.decorr_passes[dpp_idx].samples_A[1]));
byteptr[byte_idx] = temp & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
byteptr[byte_idx] = (temp >> 8) & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
if((wps.wphdr.flags & Defines.FALSE_STEREO_OR_MONO_FLAG) == 0)
{
wps.decorr_passes[dpp_idx].samples_B[0] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.decorr_passes[dpp_idx].samples_B[0]));
byteptr[byte_idx] = temp & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
byteptr[byte_idx] = (temp >> 8) & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
wps.decorr_passes[dpp_idx].samples_B[1] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.decorr_passes[dpp_idx].samples_B[1]));
byteptr[byte_idx] = temp & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
byteptr[byte_idx] = (temp >> 8) & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
}
}
else if (wps.decorr_passes[dpp_idx].term < 0)
{
wps.decorr_passes[dpp_idx].samples_A[0] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.decorr_passes[dpp_idx].samples_A[0]));
byteptr[byte_idx] = temp & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
byteptr[byte_idx] = (temp >> 8) & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
wps.decorr_passes[dpp_idx].samples_B[0] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.decorr_passes[dpp_idx].samples_B[0]));
byteptr[byte_idx] = temp & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
byteptr[byte_idx] = (temp >> 8) & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
}
else
{
var m:Int= 0;
var cnt:Int= wps.decorr_passes[dpp_idx].term;
while (cnt > 0)
{
wps.decorr_passes[dpp_idx].samples_A[m] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.decorr_passes[dpp_idx].samples_A[m]));
byteptr[byte_idx] = (temp);
byte_idx++;
byteptr[byte_idx] = ((temp >> 8));
byte_idx++;
if((wps.wphdr.flags & Defines.FALSE_STEREO_OR_MONO_FLAG) == 0)
{
wps.decorr_passes[dpp_idx].samples_B[m] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.decorr_passes[dpp_idx].samples_B[m]));
byteptr[byte_idx] = temp & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
byteptr[byte_idx] = (temp >> 8) & 0xFF;
if(byteptr[byte_idx] > 127)
{
byteptr[byte_idx] = byteptr[byte_idx] - 256;
}
byte_idx++;
}
m++;
cnt--;
}
}
wcount--;
}
else
{
for (internalc in 0...Defines.MAX_TERM)
{
wps.decorr_passes[dpp_idx].samples_A[internalc] = 0;
wps.decorr_passes[dpp_idx].samples_B[internalc] = 0;
}
}
dpp_idx++;
tcount--;
}
wpmd.byte_length = byte_idx;
wpmd.data = byteptr;
}
// Allocate room for and copy the noise shaping info into the specified
// metadata structure. These would normally be written to the
// "correction" file and are used for lossless reconstruction of
// hybrid data. The "delta" parameter is not yet used in encoding as it
// will be part of the "quality" mode.
static function write_shaping_info(wps:WavpackStream, wpmd:WavpackMetadata):Void {
var byteptr:Array<Int> = new Array();
var byte_idx:Int= 0;
var temp:Int;
wpmd.id = Defines.ID_SHAPING_WEIGHTS;
wps.dc.error[0] = WordsUtils.exp2s(temp = WordsUtils.log2s(wps.dc.error[0]));
byteptr[byte_idx] =(temp);
byte_idx++;
byteptr[byte_idx] = ((temp >> 8));
byte_idx++;
wps.dc.shaping_acc[0] = WordsUtils.exp2s(temp = WordsUtils.log2s(wps.dc.shaping_acc[0]));
byteptr[byte_idx] = (temp);
byte_idx++;
byteptr[byte_idx] = ((temp >> 8));
byte_idx++;
if((wps.wphdr.flags & Defines.FALSE_STEREO_OR_MONO_FLAG) == 0)
{
wps.dc.error[1] = WordsUtils.exp2s(temp = WordsUtils.log2s(wps.dc.error[1]));
byteptr[byte_idx] = (temp);
byte_idx++;
byteptr[byte_idx] = ((temp >> 8));
byte_idx++;
wps.dc.shaping_acc[1] = WordsUtils.exp2s(temp = WordsUtils.log2s(wps.dc.shaping_acc[1]));
byteptr[byte_idx] = (temp);
byte_idx++;
byteptr[byte_idx] = ((temp >> 8));
byte_idx++;
}
if ((wps.dc.shaping_delta[0] | wps.dc.shaping_delta[1]) != 0)
{
wps.dc.shaping_delta[0] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.dc.shaping_delta[0]));
byteptr[byte_idx] = (temp);
byte_idx++;
byteptr[byte_idx] = ((temp >> 8));
byte_idx++;
if((wps.wphdr.flags & Defines.FALSE_STEREO_OR_MONO_FLAG) == 0)
{
wps.dc.shaping_delta[1] = WordsUtils.exp2s(temp = WordsUtils.log2s(
wps.dc.shaping_delta[1]));
byteptr[byte_idx] = (temp);
byte_idx++;
byteptr[byte_idx] = ((temp >> 8));
byte_idx++;
}
}
wpmd.byte_length = byte_idx;
wpmd.data = byteptr;
}
// Allocate room for and copy the configuration information into the specified
// metadata structure. Currently, we just store the upper 3 bytes of
// config.flags and only in the first block of audio data. Note that this is
// for informational purposes not required for playback or decoding (like
// whether high or fast mode was specified).
static function write_config_info(wpc:WavpackContext, wpmd:WavpackMetadata):Void {
var byteptr:Array<Int> = new Array();
var byte_idx:Int= 0;
wpmd.id = Defines.ID_CONFIG_BLOCK;
byteptr[byte_idx] = (wpc.config.flags >> 8);
byte_idx++;
byteptr[byte_idx] = (wpc.config.flags >> 16);
byte_idx++;
byteptr[byte_idx] = (wpc.config.flags >> 24);
byte_idx++;
wpmd.byte_length = byte_idx;
wpmd.data = byteptr;
}
// Allocate room for and copy the non-standard sampling rateinto the specified
// metadata structure. We just store the lower 3 bytes of the sampling rate.
// Note that this would only be used when the sampling rate was not included
// in the table of 15 "standard" values.
static function write_sample_rate(wpc:WavpackContext, wpmd:WavpackMetadata):Void {
var byteptr:Array<Int> = new Array();
var byte_idx:Int= 0;
wpmd.id = Defines.ID_SAMPLE_RATE;
byteptr[byte_idx] = ((wpc.config.sample_rate));
byte_idx++;
byteptr[byte_idx] = ((wpc.config.sample_rate >> 8));
byte_idx++;
byteptr[byte_idx] = ((wpc.config.sample_rate >> 16));
byte_idx++;
wpmd.data = byteptr;
wpmd.byte_length = byte_idx;
}
public static function pack_start_block(wpc:WavpackContext):Int {
var wps:WavpackStream= wpc.stream;
var flags:Int = wps.wphdr.flags;
var wpmd:WavpackMetadata= new WavpackMetadata();
var i:Int= 0;
var chunkSize:Int;
wps.lossy_block = Defines.FALSE;
wps.wphdr.crc = 0xffffffff;
wps.wphdr.block_samples = 0;
wps.wphdr.ckSize = Defines.WAVPACK_HEADER_SIZE - 8;
wps.blockbuff[0] = (wps.wphdr.ckID[0]);
wps.blockbuff[1] = (wps.wphdr.ckID[1]);
wps.blockbuff[2] = (wps.wphdr.ckID[2]);
wps.blockbuff[3] = (wps.wphdr.ckID[3]);
wps.blockbuff[4] = ((wps.wphdr.ckSize));
wps.blockbuff[5] = ((wps.wphdr.ckSize >> 8));
wps.blockbuff[6] = ((wps.wphdr.ckSize >>> 16));
wps.blockbuff[7] = ((wps.wphdr.ckSize >>> 24));
wps.blockbuff[8] = ((wps.wphdr.version));
wps.blockbuff[9] = ((wps.wphdr.version >>> 8));
wps.blockbuff[10] = ((wps.wphdr.track_no));
wps.blockbuff[11] = ((wps.wphdr.index_no));
wps.blockbuff[12] = ((wps.wphdr.total_samples));
wps.blockbuff[13] = ((wps.wphdr.total_samples >>> 8));
wps.blockbuff[14] = ((wps.wphdr.total_samples >>> 16));
wps.blockbuff[15] = ((wps.wphdr.total_samples >>> 24));
wps.blockbuff[16] = ((wps.wphdr.block_index));
wps.blockbuff[17] = ((wps.wphdr.block_index >>> 8));
wps.blockbuff[18] = ((wps.wphdr.block_index >>> 16));
wps.blockbuff[19] = ((wps.wphdr.block_index >>> 24));
wps.blockbuff[20] = ((wps.wphdr.block_samples));
wps.blockbuff[21] = ((wps.wphdr.block_samples >>> 8));
wps.blockbuff[22] = ((wps.wphdr.block_samples >>> 16));
wps.blockbuff[23] = ((wps.wphdr.block_samples >>> 24));
wps.blockbuff[24] = (wps.wphdr.flags);
wps.blockbuff[25] = (wps.wphdr.flags >>> 8);
wps.blockbuff[26] = (wps.wphdr.flags >>> 16);
wps.blockbuff[27] = (wps.wphdr.flags >>> 24);
wps.blockbuff[28] = ((wps.wphdr.crc));
wps.blockbuff[29] = ((wps.wphdr.crc >>> 8));
wps.blockbuff[30] = ((wps.wphdr.crc >>> 16));
wps.blockbuff[31] = ((wps.wphdr.crc >>> 24));
write_decorr_terms(wps, wpmd);
copy_metadata(wpmd, wps.blockbuff, wps.blockend);
write_decorr_weights(wps, wpmd);
copy_metadata(wpmd, wps.blockbuff, wps.blockend);
write_decorr_samples(wps, wpmd);
copy_metadata(wpmd, wps.blockbuff, wps.blockend);
WordsUtils.write_entropy_vars(wps, wpmd);
copy_metadata(wpmd, wps.blockbuff, wps.blockend);
if(((flags & Defines.SRATE_MASK) == Defines.SRATE_MASK) && (wpc.config.sample_rate != 44100))
{
write_sample_rate(wpc, wpmd);
copy_metadata(wpmd, wps.blockbuff, wps.blockend);
}
if((flags & Defines.HYBRID_FLAG) != 0)
{
WordsUtils.write_hybrid_profile(wps, wpmd);
copy_metadata(wpmd, wps.blockbuff, wps.blockend);
}
if(((flags & Defines.INITIAL_BLOCK) != 0) && (wps.sample_index == 0))
{
write_config_info(wpc, wpmd);
copy_metadata(wpmd, wps.blockbuff, wps.blockend);
}
chunkSize = (wps.blockbuff[4] & 0xff) + ((wps.blockbuff[5] & 0xff) << 8) +
((wps.blockbuff[6] & 0xff) << 16) + ((wps.blockbuff[7] & 0xff) << 24);
BitsUtils.bs_open_write(wps.wvbits, ((chunkSize + 12)), wps.blockend);
if (wpc.wvc_flag != 0)
{
wps.block2buff[0] = (wps.wphdr.ckID[0]);
wps.block2buff[1] = (wps.wphdr.ckID[1]);
wps.block2buff[2] = (wps.wphdr.ckID[2]);
wps.block2buff[3] = (wps.wphdr.ckID[3]);
wps.block2buff[4] = ((wps.wphdr.ckSize));
wps.block2buff[5] = ((wps.wphdr.ckSize >>> 8));
wps.block2buff[6] = ((wps.wphdr.ckSize >>> 16));
wps.block2buff[7] = ((wps.wphdr.ckSize >>> 24));
wps.block2buff[8] = ((wps.wphdr.version));
wps.block2buff[9] = ((wps.wphdr.version >>> 8));
wps.block2buff[10] = ((wps.wphdr.track_no));
wps.block2buff[11] = ((wps.wphdr.index_no));
wps.block2buff[12] = ((wps.wphdr.total_samples));
wps.block2buff[13] = ((wps.wphdr.total_samples >>> 8));
wps.block2buff[14] = ((wps.wphdr.total_samples >>> 16));
wps.block2buff[15] = ((wps.wphdr.total_samples >>> 24));
wps.block2buff[16] = ((wps.wphdr.block_index));
wps.block2buff[17] = ((wps.wphdr.block_index >>> 8));
wps.block2buff[18] = ((wps.wphdr.block_index >>> 16));
wps.block2buff[19] = ((wps.wphdr.block_index >>> 24));
wps.block2buff[20] = ((wps.wphdr.block_samples));
wps.block2buff[21] = ((wps.wphdr.block_samples >>> 8));
wps.block2buff[22] = ((wps.wphdr.block_samples >>> 16));
wps.block2buff[23] = ((wps.wphdr.block_samples >>> 24));
wps.block2buff[24] = wps.wphdr.flags;
wps.block2buff[25] = (wps.wphdr.flags >>> 8);
wps.block2buff[26] = (wps.wphdr.flags >>> 16);
wps.block2buff[27] = (wps.wphdr.flags >>> 24);
wps.block2buff[28] = ((wps.wphdr.crc));
wps.block2buff[29] = ((wps.wphdr.crc >>> 8));
wps.block2buff[30] = ((wps.wphdr.crc >>> 16));
wps.block2buff[31] = ((wps.wphdr.crc >>> 24));
if((flags & Defines.HYBRID_SHAPE) != 0)
{
write_shaping_info(wps, wpmd);
copy_metadata(wpmd, wps.block2buff, wps.block2end);
}
chunkSize = (wps.block2buff[4] & 0xff) + ((wps.block2buff[5] & 0xff) << 8) +
((wps.block2buff[6] & 0xff) << 16) + ((wps.block2buff[7] & 0xff) << 24);
BitsUtils.bs_open_write(wps.wvcbits, ((chunkSize + 12)), wps.block2end);
}
return Defines.TRUE;
}
// Pack the given samples into the block currently being assembled. This function
// checks the available space each sample so that it can return prematurely to
// indicate that the blocks must be terminated. The return value is the number
// of actual samples packed and will be the same as the provided sample_count
// in no error occurs.
public static function pack_samples(wpc:WavpackContext, buffer:Array<Int>, sample_count:Int):Int {
var wps:WavpackStream= wpc.stream;
var flags: Int = wps.wphdr.flags;
var tcount:Int;
var lossy:Int= 0;
var m:Int;
var byte_idx:Int= 0;
var dpp_idx:Int= 0;
var crc : Int = 0;
var crc2 : Int = 0;
var i:Int;
var bptr:Array<Int>;
var block_samples:Int;
if (sample_count == 0)
{
return 0;
}
byte_idx = wpc.byte_idx; // Get the index position for the buffer holding the input WAV data
i = 0;
block_samples = (((wps.blockbuff[23] & 0xFF) << 24));
block_samples += (((wps.blockbuff[22] & 0xFF) << 16));
block_samples += (((wps.blockbuff[21] & 0xFF) << 8));
block_samples += ((wps.blockbuff[20] & 0xFF));
m = ((block_samples & (Defines.MAX_TERM - 1)));
crc = (wps.blockbuff[31]&0xFF) << 24;
crc +=(wps.blockbuff[30]&0xFF) << 16;
crc +=(wps.blockbuff[29]&0xFF) << 8;
crc +=(wps.blockbuff[28]) & 0xFF;
crc2 = 0;
if (wpc.wvc_flag != 0)
{
crc2 = (wps.block2buff[31]&0xFF) << 24;
crc2 +=(wps.block2buff[30]&0xFF) << 16;
crc2 +=(wps.block2buff[29]&0xFF) << 8;
crc2 +=(wps.block2buff[28]) & 0xFF;
}
bptr = new Array();
/////////////////////// handle lossless mono mode /////////////////////////
if (((flags & Defines.HYBRID_FLAG) == 0) && ((flags & Defines.FALSE_STEREO_OR_MONO_FLAG) != 0))
{
bptr = buffer;
for (internalCounter in 0...sample_count)
{
var code:Int = 0;
if (BitsUtils.bs_remain_write(wps.wvbits) < 64)
{
break;
}
code = bptr[byte_idx];
crc = (crc * 3) + code;
byte_idx++;
dpp_idx = 0;
tcount = wps.num_terms;
while (tcount > 0)
{
var sam:Int;
if (wps.decorr_passes[dpp_idx].term > Defines.MAX_TERM)
{
if ((wps.decorr_passes[dpp_idx].term & 1) != 0)
{
sam = (2* wps.decorr_passes[dpp_idx].samples_A[0]) -
wps.decorr_passes[dpp_idx].samples_A[1];
}
else
{
sam = ((3* wps.decorr_passes[dpp_idx].samples_A[0]) -
wps.decorr_passes[dpp_idx].samples_A[1]) >> 1;
}
wps.decorr_passes[dpp_idx].samples_A[1] = wps.decorr_passes[dpp_idx].samples_A[0];
wps.decorr_passes[dpp_idx].samples_A[0] = code;
}
else
{
sam = wps.decorr_passes[dpp_idx].samples_A[m];
wps.decorr_passes[dpp_idx].samples_A[(m + wps.decorr_passes[dpp_idx].term) &
(Defines.MAX_TERM - 1)] = code;
}
code -= apply_weight(wps.decorr_passes[dpp_idx].weight_A, sam);
wps.decorr_passes[dpp_idx].weight_A = update_weight(wps.decorr_passes[dpp_idx].weight_A,
wps.decorr_passes[dpp_idx].delta, sam, code);
dpp_idx++;
tcount--;
}
m = (m + 1) & (Defines.MAX_TERM - 1);
WordsUtils.send_word_lossless(wps, code, 0);
i++;
}
wpc.byte_idx = byte_idx;
}
//////////////////// handle the lossless stereo mode //////////////////////
else if (((flags & Defines.HYBRID_FLAG) == 0) && ((flags & Defines.FALSE_STEREO_OR_MONO_FLAG) == 0))
{
bptr = buffer;
for (internalCounter in 0...sample_count)
{
var left:Int;
var right:Int;
var sam_A:Int;
var sam_B:Int;
if (BitsUtils.bs_remain_write(wps.wvbits) < 128)
{
break;
}
left = bptr[byte_idx];
crc = (crc * 3) + left;
right = bptr[byte_idx + 1];
crc = (crc * 3) + right;
byte_idx = byte_idx + 2;
if((flags & Defines.JOINT_STEREO) != 0)
{
right += ((left -= right) >> 1);
}
dpp_idx = 0;
tcount = wps.num_terms;
while (tcount > 0)
{
if (wps.decorr_passes[dpp_idx].term > 0)
{
if (wps.decorr_passes[dpp_idx].term > Defines.MAX_TERM)
{
if ((wps.decorr_passes[dpp_idx].term & 1) != 0)
{
sam_A = (2* wps.decorr_passes[dpp_idx].samples_A[0]) -
wps.decorr_passes[dpp_idx].samples_A[1];
sam_B = (2* wps.decorr_passes[dpp_idx].samples_B[0]) -
wps.decorr_passes[dpp_idx].samples_B[1];
}
else
{
sam_A = ((3* wps.decorr_passes[dpp_idx].samples_A[0]) -
wps.decorr_passes[dpp_idx].samples_A[1]) >> 1;
sam_B = ((3* wps.decorr_passes[dpp_idx].samples_B[0]) -
wps.decorr_passes[dpp_idx].samples_B[1]) >> 1;
}
wps.decorr_passes[dpp_idx].samples_A[1] = wps.decorr_passes[dpp_idx].samples_A[0];
wps.decorr_passes[dpp_idx].samples_B[1] = wps.decorr_passes[dpp_idx].samples_B[0];
wps.decorr_passes[dpp_idx].samples_A[0] = left;
wps.decorr_passes[dpp_idx].samples_B[0] = right;
}
else
{
var k:Int= (m + wps.decorr_passes[dpp_idx].term) & (Defines.MAX_TERM - 1);
sam_A = wps.decorr_passes[dpp_idx].samples_A[m];
sam_B = wps.decorr_passes[dpp_idx].samples_B[m];
wps.decorr_passes[dpp_idx].samples_A[k] = left;
wps.decorr_passes[dpp_idx].samples_B[k] = right;
}
left -= apply_weight(wps.decorr_passes[dpp_idx].weight_A, sam_A);
right -= apply_weight(wps.decorr_passes[dpp_idx].weight_B, sam_B);
wps.decorr_passes[dpp_idx].weight_A = update_weight(wps.decorr_passes[dpp_idx].weight_A,
wps.decorr_passes[dpp_idx].delta, sam_A, left);
wps.decorr_passes[dpp_idx].weight_B = update_weight(wps.decorr_passes[dpp_idx].weight_B,
wps.decorr_passes[dpp_idx].delta, sam_B, right);
}
else
{
sam_A = (wps.decorr_passes[dpp_idx].term == -2) ? right
: wps.decorr_passes[dpp_idx].samples_A[0];
sam_B = (wps.decorr_passes[dpp_idx].term == -1) ? left
: wps.decorr_passes[dpp_idx].samples_B[0];
wps.decorr_passes[dpp_idx].samples_A[0] = right;
wps.decorr_passes[dpp_idx].samples_B[0] = left;
left -= apply_weight(wps.decorr_passes[dpp_idx].weight_A, sam_A);
right -= apply_weight(wps.decorr_passes[dpp_idx].weight_B, sam_B);
wps.decorr_passes[dpp_idx].weight_A = update_weight_clip(wps.decorr_passes[dpp_idx].weight_A,
wps.decorr_passes[dpp_idx].delta, sam_A, left);
wps.decorr_passes[dpp_idx].weight_B = update_weight_clip(wps.decorr_passes[dpp_idx].weight_B,
wps.decorr_passes[dpp_idx].delta, sam_B, right);
}
dpp_idx++;
tcount--;
}
m = (m + 1) & (Defines.MAX_TERM - 1);
WordsUtils.send_word_lossless(wps, left, 0);
WordsUtils.send_word_lossless(wps, right, 1);
i++;
}
wpc.byte_idx = byte_idx;
}
/////////////////// handle the lossy/hybrid mono mode /////////////////////
else if (((flags & Defines.HYBRID_FLAG) != 0) && (flags & Defines.FALSE_STEREO_OR_MONO_FLAG) != 0)
{
bptr = buffer;
for (internalCounter in 0...sample_count)
{
var code:Int;
var temp:Int;
if ((BitsUtils.bs_remain_write(wps.wvbits) < 64) ||
((wpc.wvc_flag != 0) && (BitsUtils.bs_remain_write(wps.wvcbits) < 64)))
{
break;
}
code = bptr[byte_idx];
crc2 = (crc2 * 3) + code;
byte_idx++;
if((flags & Defines.HYBRID_SHAPE) != 0 )
{
wps.dc.shaping_acc[0] += wps.dc.shaping_delta[0];
var shaping_weight:Int= (wps.dc.shaping_acc[0] ) >> 16;
temp = -apply_weight(shaping_weight, wps.dc.error[0]);
if((flags & Defines.NEW_SHAPING) != 0 && (shaping_weight < 0) && (temp != 0))
{
if (temp == wps.dc.error[0])
{
temp = (temp < 0) ? (temp + 1) : (temp - 1);
}
wps.dc.error[0] = -code;
code += temp;
}
else
{
wps.dc.error[0] = -(code += temp);
}
}
dpp_idx = 0;
tcount = wps.num_terms;
while (tcount > 0)
{
if (wps.decorr_passes[dpp_idx].term > Defines.MAX_TERM)
{
if ((wps.decorr_passes[dpp_idx].term & 1) != 0)
{
wps.decorr_passes[dpp_idx].samples_A[2] = (2* wps.decorr_passes[dpp_idx].samples_A[0]) -
wps.decorr_passes[dpp_idx].samples_A[1];
}
else
{
wps.decorr_passes[dpp_idx].samples_A[2] = ((3* wps.decorr_passes[dpp_idx].samples_A[0]) -
wps.decorr_passes[dpp_idx].samples_A[1]) >> 1;
}
code -= (wps.decorr_passes[dpp_idx].aweight_A = apply_weight(wps.decorr_passes[dpp_idx].weight_A,
wps.decorr_passes[dpp_idx].samples_A[2]));
}
else
{
code -= (wps.decorr_passes[dpp_idx].aweight_A = apply_weight(wps.decorr_passes[dpp_idx].weight_A,
wps.decorr_passes[dpp_idx].samples_A[m]));
}
dpp_idx++;
tcount--;
}
code = WordsUtils.send_word(wps, code, 0);
dpp_idx--;
while (dpp_idx >= 0)
{
if (wps.decorr_passes[dpp_idx].term > Defines.MAX_TERM)
{
wps.decorr_passes[dpp_idx].weight_A = update_weight(wps.decorr_passes[dpp_idx].weight_A,
wps.decorr_passes[dpp_idx].delta,
wps.decorr_passes[dpp_idx].samples_A[2], code);
wps.decorr_passes[dpp_idx].samples_A[1] = wps.decorr_passes[dpp_idx].samples_A[0];
wps.decorr_passes[dpp_idx].samples_A[0] = (code += wps.decorr_passes[dpp_idx].aweight_A);
}
else
{
var sam:Int= wps.decorr_passes[dpp_idx].samples_A[m];
wps.decorr_passes[dpp_idx].weight_A = update_weight(wps.decorr_passes[dpp_idx].weight_A,
wps.decorr_passes[dpp_idx].delta, sam, code);
wps.decorr_passes[dpp_idx].samples_A[(m + wps.decorr_passes[dpp_idx].term) &
(Defines.MAX_TERM - 1)] = (code += wps.decorr_passes[dpp_idx].aweight_A);
}
dpp_idx--;
}
wps.dc.error[0] += code;
m = (m + 1) & (Defines.MAX_TERM - 1);
crc = (crc * 3) + code;
if (crc != crc2)
{
lossy = Defines.TRUE;
}
i++;
}
wpc.byte_idx = byte_idx;
}
/////////////////// handle the lossy/hybrid stereo mode ///////////////////
else if (((flags & Defines.HYBRID_FLAG) != 0) && ((flags & (Defines.FALSE_STEREO_OR_MONO_FLAG)) == 0))
{
bptr = buffer;
for (internalCounter in 0...sample_count)
{
var left:Int;
var right:Int;
var temp:Int;
var shaping_weight:Int;
if ((BitsUtils.bs_remain_write(wps.wvbits) < 128) ||
((wpc.wvc_flag != 0) && (BitsUtils.bs_remain_write(wps.wvcbits) < 128)))
{
break;
}
left = bptr[byte_idx];
byte_idx++;
right = bptr[byte_idx];
crc2 = (((crc2 * 3) + left) * 3) + right;
byte_idx++;
if ((flags & Defines.HYBRID_SHAPE) != 0)
{
wps.dc.shaping_acc[0] += wps.dc.shaping_delta[0];
shaping_weight = (wps.dc.shaping_acc[0]) >> 16;
temp = -apply_weight(shaping_weight, wps.dc.error[0]);
if (((flags & Defines.NEW_SHAPING) != 0) && (shaping_weight < 0) && (temp != 0))
{
if (temp == wps.dc.error[0])
{
temp = (temp < 0) ? (temp + 1) : (temp - 1);
}
wps.dc.error[0] = -left;
left += temp;
}
else
{
wps.dc.error[0] = -(left += temp);
}
wps.dc.shaping_acc[1] += wps.dc.shaping_delta[1];
shaping_weight = (wps.dc.shaping_acc[1]) >> 16;
temp = -apply_weight(shaping_weight, wps.dc.error[1]);
if (((flags & Defines.NEW_SHAPING) != 0) && (shaping_weight < 0) && (temp != 0))
{
if (temp == wps.dc.error[1])
{
temp = (temp < 0) ? (temp + 1) : (temp - 1);
}
wps.dc.error[1] = -right;
right += temp;
}
else
{
wps.dc.error[1] = -(right += temp);
}
}
if ((flags & Defines.JOINT_STEREO) != 0)
{
left -= right;
right += (left >> 1);
}
dpp_idx = 0;
tcount = wps.num_terms;
while (tcount > 0)
{
if (wps.decorr_passes[dpp_idx].term > Defines.MAX_TERM)
{
if ((wps.decorr_passes[dpp_idx].term & 1) != 0)
{
wps.decorr_passes[dpp_idx].samples_A[2] = (2* wps.decorr_passes[dpp_idx].samples_A[0]) -
wps.decorr_passes[dpp_idx].samples_A[1];
wps.decorr_passes[dpp_idx].samples_B[2] = (2* wps.decorr_passes[dpp_idx].samples_B[0]) -
wps.decorr_passes[dpp_idx].samples_B[1];
}