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This commit is contained in:
chudov
2008-11-22 15:06:22 +00:00
parent b4c0c7e381
commit 3c1cebb93e
1 changed files with 52 additions and 10 deletions
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62
LossyWAVDotNet/LossyWAV.cs
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@@ -33,6 +33,8 @@ namespace LossyWAVDotNet
{
#region Public Methods
public const string version_string = "1.1.1#";
public LossyWAVWriter(IAudioDest audioDest, IAudioDest lwcdfDest, int bitsPerSample, int channelCount, int sampleRate, double quality)
{
_audioDest = audioDest;
@@ -41,6 +43,11 @@ namespace LossyWAVDotNet
samplerate = sampleRate;
bitspersample = bitsPerSample;
if (_audioDest != null && _audioDest.BitsPerSample > bitsPerSample)
throw new Exception("audio parameters mismatch");
if (_lwcdfDest != null && _lwcdfDest.BitsPerSample != bitsPerSample)
throw new Exception("audio parameters mismatch");
int quality_integer = (int)Math.Floor(quality);
fft_analysis_string = new string[4] { "0100010", "0110010", "0111010", "0111110" };
@@ -138,6 +145,26 @@ namespace LossyWAVDotNet
set { }
}
public int BitsPerSample
{
get { return bitspersample; }
}
public int OverallBitsRemoved
{
get { return overall_bits_removed; }
}
public int BlocksProcessed
{
get { return blocks_processed; }
}
public int SamplesProcessed
{
get { return (blocks_processed - 1) * codec_block_size + this_codec_block_size; }
}
public int Analysis
{
get { return this_analysis_number; }
@@ -367,9 +394,9 @@ namespace LossyWAVDotNet
for (int i = analysis_recs[analysis_number].lo_bins; i <= analysis_recs[analysis_number].hi_bins; i++)
{
double f_tfb = i * analysis_recs[analysis_number].bin_width;
double sp = (float)(1 + Math.Pow(Math.Min(f_dfb, f_tfb - f_lfb) / f_dfb, SP) * SW);
double sp = 1 + Math.Pow(Math.Min(f_dfb, f_tfb - f_lfb) / f_dfb, SP) * SW;
int sp_int = (int)Math.Floor(sp - 1);
double sp_rem = Math.Max(0, sp - sp_int - (1 - (sp_int & 1))) / 2F;
double sp_rem = Math.Max(0, sp - sp_int - (1 - (sp_int & 1))) / 2.0;
analysis_recs[analysis_number].spreading_averages_int[i] = sp_int;
analysis_recs[analysis_number].spreading_averages_rem[i] = (float)sp_rem;
analysis_recs[analysis_number].spreading_averages_rec[i] = (float)(1 / sp);
@@ -400,20 +427,19 @@ namespace LossyWAVDotNet
rotating_blocks_ptr[i] = new int[codec_block_size, channels];
btrd_codec_block = new int[codec_block_size, channels];
corr_codec_block = new int[codec_block_size, channels];
blocks_processed = 1;
blocks_processed = 0;
overall_bits_removed = 0;
overall_bits_lost = 0;
initialized = true;
const uint fccFact = 0x74636166;
string version_string = "lossyWAV 1.1.1#";
string datestamp = DateTime.Now.ToString();
string parameter_string = "--standard "; // !!!!!
string factString = version_string + " @ " + datestamp + ", " + parameter_string + "\r\n\0";
string factString = "lossyWAV " + version_string + " @ " + datestamp + ", " + parameter_string + "\r\n\0";
if (_audioDest != null && _audioDest is WAVWriter) ((WAVWriter)_audioDest).WriteChunk(fccFact, new ASCIIEncoding().GetBytes(factString));
if (_lwcdfDest != null && _lwcdfDest is WAVWriter) ((WAVWriter)_lwcdfDest).WriteChunk(fccFact, new ASCIIEncoding().GetBytes(factString));
_audioDest.BlockSize = codec_block_size;
_lwcdfDest.BlockSize = codec_block_size * 2;
if (_audioDest != null) _audioDest.BlockSize = codec_block_size;
if (_lwcdfDest != null) _lwcdfDest.BlockSize = codec_block_size * 2;
}
double fill_fft_input(int actual_analysis_block_start, int this_fft_length, int channel)
@@ -443,7 +469,7 @@ namespace LossyWAVDotNet
}
sc_i = analysis_recs[analysis_number].hi_bins + 1;
sc_x = Math.Sqrt(fastsqr(fft_array[sc_i * 2]) + fastsqr(fft_array[sc_i * 2 + 1])) * analysis_recs[analysis_number].skewing_function[sc_i];
sc_y += sc_x;
//sc_y += sc_x;
fft_result[sc_i] = sc_x;
double snr_value_exp = Math.Pow(2, snr_value / lg2x20);
@@ -463,6 +489,12 @@ namespace LossyWAVDotNet
void remove_bits(int channel, short bits_to_remove_from_this_channel)
{
short min_bits_to_remove = 0;
if (_audioDest != null && _audioDest.BitsPerSample < bitspersample)
min_bits_to_remove = (short) (bitspersample - _audioDest.BitsPerSample);
if (bits_to_remove_from_this_channel < min_bits_to_remove)
bits_to_remove_from_this_channel = min_bits_to_remove;
channel_recs[channel].bits_to_remove = bits_to_remove_from_this_channel;
channel_recs[channel].bits_lost = 0;
channel_recs[channel].clipped_samples = 0;
@@ -528,7 +560,7 @@ namespace LossyWAVDotNet
channel_recs[channel].clipped_samples = this_channel_clips;
if (this_channel_clips <= maximum_clips_per_channel)
break;
if (bits_to_remove_from_this_channel == 0)
if (bits_to_remove_from_this_channel <= min_bits_to_remove)
break;
bits_to_remove_from_this_channel--;
channel_recs[channel].bits_lost++;
@@ -648,7 +680,17 @@ namespace LossyWAVDotNet
clipped_samples += channel_recs[channel].clipped_samples;
}
if (_audioDest != null) _audioDest.Write(btrd_codec_block, (uint)this_codec_block_size);
if (_audioDest != null)
{
if (_audioDest.BitsPerSample < bitspersample)
{
int sh = bitspersample - _audioDest.BitsPerSample;
for (int i = 0; i < this_codec_block_size; i++)
for (int c = 0; c < channels; c++)
btrd_codec_block[i, c] >>= sh;
}
_audioDest.Write(btrd_codec_block, (uint)this_codec_block_size);
}
if (_lwcdfDest != null) _lwcdfDest.Write(corr_codec_block, (uint)this_codec_block_size);
}