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CUETools.Codecs.ALAC several bugfixes

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This commit is contained in:
Grigory Chudov
2018-02-19 20:46:10 -05:00
parent 6312b2a86a
commit 7133c09fb8
1 changed files with 21 additions and 9 deletions
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16
CUETools.Codecs.ALAC/ALACWriter.cs
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@@ -514,7 +514,7 @@ namespace CUETools.Codecs.ALAC
/* generate warm-up samples */
res[0] = smp[0];
for (int i = 1; i <= order; i++)
res[i] = smp[i] - smp[i - 1];
res[i] = extend_sign32(smp[i] - smp[i - 1], bps);
#if aaa
// contains errors: if (resval * orig_sign <= 0) continue; is not the same as sign(resval) * sign(orig), because 0x80000000 * 0xffffffff < 0!
@@ -738,6 +738,8 @@ namespace CUETools.Codecs.ALAC
k = k > k_modifier ? k_modifier : k;
size += (x >> k) > 8 ? 9 + bps : (x >> k) + k + 1;
history += x * rice_historymult - ((history * rice_historymult) >> 9);
if (x > 0xFFFF)
history = 0xFFFF;
}
return size;
}
@@ -760,6 +762,8 @@ namespace CUETools.Codecs.ALAC
history += x * rice_historymult - ((history * rice_historymult) >> 9);
sign_modifier = 0;
// this werid if actually hurts compression speed and ratio, but
// unfortunately cannot be removed because the decoder does the same.
if (x > 0xFFFF)
history = 0xFFFF;
@@ -867,6 +871,9 @@ namespace CUETools.Codecs.ALAC
frame.ChooseBestSubframe(ch);
}
// Before returning, we must call ChooseBestSubframe at least once.
if (n < eparams.max_prediction_order) return;
float* lpcs = stackalloc float[lpc.MAX_LPC_ORDER * lpc.MAX_LPC_ORDER];
int min_order = eparams.min_prediction_order;
int max_order = eparams.max_prediction_order;
@@ -1236,6 +1243,9 @@ namespace CUETools.Codecs.ALAC
if (frame.type == FrameType.Verbatim)
{
int obps = Settings.PCM.BitsPerSample;
// Second call to ChooseSubframes will undo the
// channel swap
frame.ChooseSubframes();
for (int i = 0; i < frame.blocksize; i++)
for (int ch = 0; ch < Settings.PCM.ChannelCount; ch++)
bitwriter.writebits_signed(obps, frame.subframes[ch].samples[i]);
@@ -1247,6 +1257,8 @@ namespace CUETools.Codecs.ALAC
bps, frame.subframes[ch].best.ricemodifier);
}
output_frame_footer(bitwriter);
if (bitwriter.Length >= max_frame_size)
throw new Exception("buffer overflow");
if (_sample_byte_size.Length <= frame_count)
{
@@ -1747,7 +1759,7 @@ namespace CUETools.Codecs.ALAC
// set maximum encoded frame size (if larger, re-encodes in verbatim mode)
if (Settings.PCM.ChannelCount == 2)
max_frame_size = 16 + ((m_blockSize * (Settings.PCM.BitsPerSample + Settings.PCM.BitsPerSample + 1) + 7) >> 3);
max_frame_size = 16 + ((m_blockSize * Settings.PCM.ChannelCount * (Settings.PCM.BitsPerSample + Settings.PCM.ChannelCount - 1) + 7) >> 3);
else
max_frame_size = 16 + ((m_blockSize * Settings.PCM.ChannelCount * Settings.PCM.BitsPerSample + 7) >> 3);