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Implement padding support for mp3 files

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This commit is contained in:
Grigory Chudov
2018-07-03 19:56:08 -04:00
parent c0836e7d31
commit 989ca7f793
1 changed files with 18 additions and 12 deletions
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30
CUETools.Codecs.libmp3lame/LameWriter.cs
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@@ -15,6 +15,7 @@ namespace CUETools.Codecs.libmp3lame
private uint m_finalSampleCount;
private byte[] m_outputBuffer;
private long m_bytesWritten;
private long m_streamStart;
public long FinalSampleCount
{
@@ -85,7 +86,7 @@ namespace CUETools.Codecs.libmp3lame
}
int lametagFrameSize = this.GetLametagFrame();
this.m_outputStream.Seek(0, SeekOrigin.Begin);
this.m_outputStream.Seek(m_streamStart, SeekOrigin.Begin);
this.m_outputStream.Write(this.m_outputBuffer, 0, lametagFrameSize);
}
@@ -122,6 +123,7 @@ namespace CUETools.Codecs.libmp3lame
private int GetLametagFrame()
{
this.EnsureOutputBufferSize(1024);
while (true)
{
uint lametagFrameResult;
@@ -144,17 +146,6 @@ namespace CUETools.Codecs.libmp3lame
}
}
public uint GetLametagFrame(byte[] outputBuffer)
{
unsafe
{
fixed (byte* outputBufferPtr = outputBuffer)
{
return libmp3lamedll.lame_get_lametag_frame(m_handle, (IntPtr)outputBufferPtr, (uint)outputBuffer.Length);
}
}
}
private void EnsureInitialized()
{
if (!this.m_initialized)
@@ -179,6 +170,21 @@ namespace CUETools.Codecs.libmp3lame
throw new LameException("lame_init_params failed");
}
byte[] id3v2 = { 0x49, 0x44, 0x33, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
int padding = m_settings.Padding;
int id3v2sz = padding;
int i = 9;
do
{
id3v2[i--] = (byte)(id3v2sz & 0x7f);
id3v2sz >>= 7;
} while (id3v2sz != 0);
m_outputStream.Write(id3v2, 0, id3v2.Length);
m_bytesWritten += id3v2.Length;
m_outputStream.Write(new byte[padding], 0, padding);
m_bytesWritten += padding;
m_streamStart = this.m_outputStream.Position;
this.m_initialized = true;
}
}