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RF64 implementation

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Jamie Hardt
2020-12-26 19:01:32 -08:00
parent 1d2edcb675
commit 155a26ace0
1 changed files with 12 additions and 4 deletions
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16
src/wavewriter.rs
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@@ -91,12 +91,18 @@ impl<W> WaveChunkWriter<W> where W: Write + Seek {
fn increment_chunk_length(&mut self, amount: u64) -> Result<(), std::io::Error> { fn increment_chunk_length(&mut self, amount: u64) -> Result<(), std::io::Error> {
self.length = self.length + amount; self.length = self.length + amount;
if self.length < u32::MAX as u64 { if !self.inner.is_rf64 {
self.inner.inner.seek(SeekFrom::Start(self.content_start_pos - 4))?; self.inner.inner.seek(SeekFrom::Start(self.content_start_pos - 4))?;
self.inner.inner.write_u32::<LittleEndian>(self.length as u32)?; self.inner.inner.write_u32::<LittleEndian>(self.length as u32)?;
} else { } else {
if self.ident == DATA_SIG { if self.ident == DATA_SIG {
todo!("FIXME RF64 wave writing is not yet supported") let data_chunk_64bit_field_offset = 8 + 4 + 8 + 8;
self.inner.inner.seek(SeekFrom::Start(self.content_start_pos - 4))?;
self.inner.inner.write_u32::<LittleEndian>(0xFFFF_FFFF)?;
// this only need to happen once, not every time we increment
self.inner.inner.seek(SeekFrom::Start(data_chunk_64bit_field_offset))?;
self.inner.inner.write_u64::<LittleEndian>(self.length)?;
} else { } else {
todo!("FIXME RF64 wave writing is not yet supported") todo!("FIXME RF64 wave writing is not yet supported")
} }
@@ -208,16 +214,17 @@ impl<W> WaveWriter<W> where W: Write + Seek {
Ok( retval ) Ok( retval )
} }
fn promote_to_rf64(&mut self) -> Result<(),Error> { fn promote_to_rf64(&mut self) -> Result<(), std::io::Error> {
if !self.is_rf64 { if !self.is_rf64 {
self.inner.seek(SeekFrom::Start(0))?; self.inner.seek(SeekFrom::Start(0))?;
self.inner.write_fourcc(RF64_SIG)?; self.inner.write_fourcc(RF64_SIG)?;
self.inner.write_u32::<LittleEndian>(0xFFFF)?; self.inner.write_u32::<LittleEndian>(0xFFFF_FFFF)?;
self.inner.seek(SeekFrom::Start(12))?; self.inner.seek(SeekFrom::Start(12))?;
self.inner.write_fourcc(DS64_SIG)?; self.inner.write_fourcc(DS64_SIG)?;
self.inner.seek(SeekFrom::Current(4))?; self.inner.seek(SeekFrom::Current(4))?;
self.inner.write_u64::<LittleEndian>(self.form_length)?; self.inner.write_u64::<LittleEndian>(self.form_length)?;
self.is_rf64 = true;
} }
Ok(()) Ok(())
} }
@@ -265,6 +272,7 @@ impl<W> WaveWriter<W> where W: Write + Seek {
self.inner.write_u32::<LittleEndian>(self.form_length as u32)?; self.inner.write_u32::<LittleEndian>(self.form_length as u32)?;
Ok(()) Ok(())
} else { } else {
self.promote_to_rf64()?;
todo!("FIXME RF64 wave writing is not yet supported") todo!("FIXME RF64 wave writing is not yet supported")
} }