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https://github.com/iluvcapra/bwavfile.git
synced 2025-12-31 17:00:44 +00:00
WaveWriter impl, a new approach
This commit is contained in:
Jamie Hardt
@@ -1,43 +0,0 @@
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use std::io::{Write,Seek,SeekFrom};
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use super::wavewriter::WaveWriter;
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use super::errors::Error;
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use super::fmt::WaveFmt;
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use byteorder::LittleEndian;
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use byteorder::WriteBytesExt;
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pub struct AudioFrameWriter<W: Write + Seek> {
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inner : W,
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form_size : u64,
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data_size : u64,
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data_start : u64,
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format: WaveFmt
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}
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impl<W:Write + Seek> AudioFrameWriter<W> {
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pub fn new(inner: W, format: WaveFmt) -> Self {
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todo!();
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}
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pub fn write_audio_frame(&mut self, buffer: &[i32]) -> Result<u64,Error> {
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assert!(buffer.len() as u16 == self.format.channel_count,
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"read_integer_frame was called with a mis-sized buffer, expected {}, was {}",
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self.format.channel_count, buffer.len());
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let framed_bits_per_sample = self.format.block_alignment * 8 / self.format.channel_count;
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for n in 0..(self.format.channel_count as usize) {
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match (self.format.bits_per_sample, framed_bits_per_sample) {
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(0..=8,8) => self.inner.write_u8(( buffer[n] + 0x80) as u8 )?, // EBU 3285 §A2.2
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(9..=16,16) => self.inner.write_i16::<LittleEndian>(buffer[n] as i16)?,
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(10..=24,24) => self.inner.write_i24::<LittleEndian>(buffer[n])?,
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(25..=32,32) => self.inner.write_i32::<LittleEndian>(buffer[n])?,
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(b,_)=> panic!("Unrecognized integer format, bits per sample {}, channels {}, block_alignment {}",
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b, self.format.channel_count, self.format.block_alignment)
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}
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}
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Ok( 1 )
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}
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}
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@@ -112,7 +112,6 @@ mod common_format;
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mod parser;
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mod audio_frame_reader;
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mod audio_frame_writer;
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mod list_form;
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mod chunks;
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@@ -1,215 +1,138 @@
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use std::collections::HashMap;
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use std::io::{Write, Seek, SeekFrom};
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use std::fs::File;
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use std::io::Cursor;
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use std::io::{Write,Seek,SeekFrom};
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use super::errors::Error;
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use super::chunks::WriteBWaveChunks;
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use super::Error;
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use super::fourcc::{FourCC, WriteFourCC, RIFF_SIG, WAVE_SIG, FMT__SIG,};
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use super::fmt::WaveFmt;
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use super::common_format::CommonFormat;
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use super::fourcc::{FourCC, RIFF_SIG, RF64_SIG, WAVE_SIG, FMT__SIG, JUNK_SIG,
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DS64_SIG, FACT_SIG, FLLR_SIG, ELM1_SIG, WriteFourCC};
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use super::bext::Bext;
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//use super::audio_frame_writer::AudioFrameWriter;
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use super::chunks::WriteBWaveChunks;
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use byteorder::LittleEndian;
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use byteorder::WriteBytesExt;
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enum WritingState {
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NoChunk,
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ChunkOpen { ident: FourCC, length: u64, length_field_pos: u64 }
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pub struct WaveChunkWriter<W> where W: Write + Seek {
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inner : WaveWriter<W>,
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content_start_pos : u64,
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length : u64
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}
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/// This isn't working yet, do not use.
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impl<W> WaveChunkWriter<W> where W: Write + Seek {
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fn begin(mut inner : WaveWriter<W>, ident : FourCC) -> Result<Self,Error> {
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let length : u64 = 0;
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inner.inner.write_fourcc(ident)?;
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inner.inner.write_u32::<LittleEndian>(length as u32)?;
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inner.increment_form_length(8)?;
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let content_start_pos = inner.inner.seek(SeekFrom::End(0))?;
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Ok( WaveChunkWriter { inner , content_start_pos, length } )
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}
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fn end(self) -> WaveWriter<W> {
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self.inner
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}
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fn increment_chunk_length(&mut self, amount: u64) -> Result<(), std::io::Error> {
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self.length = self.length + amount;
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if self.length < u32::MAX as u64 {
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self.inner.inner.seek(SeekFrom::Start(self.content_start_pos - 4))?;
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self.inner.inner.write_u32::<LittleEndian>(self.length as u32)?;
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} else {
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todo!()
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}
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Ok(())
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}
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}
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impl<W> Write for WaveChunkWriter<W> where W: Write + Seek {
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fn write(&mut self, buffer: &[u8]) -> Result<usize, std::io::Error> {
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self.inner.inner.seek(SeekFrom::End(0))?;
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let written = self.inner.inner.write(buffer)?;
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self.increment_chunk_length(written as u64)?;
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self.inner.increment_form_length(written as u64)?;
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Ok( written )
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}
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fn flush(&mut self) -> Result<(), std::io::Error> {
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self.inner.inner.flush()
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}
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}
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/// Wave, Broadcast-WAV and RF64/BW64 writer.
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///
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///
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pub struct WaveWriter<W> where W: Write + Seek {
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pub format : WaveFmt,
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inner : W,
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form_size : u64,
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ds64_sizes : Option<HashMap<FourCC,u64>>,
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writing_state : WritingState,
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form_length: u64,
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format: WaveFmt
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}
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impl WaveWriter<File> {
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pub fn create(path: &str, format: WaveFmt) -> Result<Self, Error> {
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/// Create a new Wave file at `path`.
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pub fn create(path : &str, format : WaveFmt) -> Result<Self, Error> {
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let f = File::create(path)?;
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Self::new(f, format)
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Ok( Self::new(f, format)? )
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}
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}
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impl<W: Write + Seek> WaveWriter<W> {
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/// Wrap a `Write` struct with a wavewriter.
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pub fn new(inner : W, format: WaveFmt) -> Result<Self,Error> {
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let mut retval = Self { inner, form_size : 0, format: format,
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ds64_sizes : None,
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writing_state : WritingState::NoChunk
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};
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impl<W> WaveWriter<W> where W: Write + Seek {
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retval.inner.seek(SeekFrom::Start(0))?;
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retval.inner.write_fourcc(RIFF_SIG)?;
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retval.inner.write_u32::<LittleEndian>(0)?;
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retval.inner.write_fourcc(WAVE_SIG)?;
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retval.update_form_size(4)?;
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retval.write_ds64_reservation()?;
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retval.write_format_chunk()?;
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if format.common_format() != CommonFormat::IntegerPCM {
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retval.write_fact_chunk()?;
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}
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retval.write_framing_filler()?;
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/// Wrap a writer in a Wave writer.
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///
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/// The inner writer will immediately have a RIFF WAVE file header
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/// written to it along with the format descriptor (and possibly a `fact`
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/// chunk if appropriate).
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pub fn new(mut inner : W, format: WaveFmt) -> Result<Self, Error> {
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inner.write_fourcc(RIFF_SIG)?;
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inner.write_u32::<LittleEndian>(0)?;
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inner.write_fourcc(WAVE_SIG)?;
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let mut retval = WaveWriter { inner, form_length: 0, format};
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retval.increment_form_length(4)?;
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let mut chunk = retval.begin_chunk(FMT__SIG)?;
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chunk.write_wave_fmt(&format)?;
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let retval = chunk.end();
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Ok( retval )
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}
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/// Unwrap the inner writer.
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pub fn into_inner(self) -> W {
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return self.inner;
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}
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pub fn begin_chunk(&mut self, ident : FourCC) -> Result<(),Error> {
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/// Create a new chunk writer, which takes posession of the `WaveWriter`.
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///
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/// Begin writing a chunk segment. To close the chunk (and perhaps write
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/// another), call `end()` on the chunk writer.
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pub fn begin_chunk(mut self, ident: FourCC) -> Result<WaveChunkWriter<W>,Error> {
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self.inner.seek(SeekFrom::End(0))?;
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self.inner.write_fourcc(ident)?;
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let length_field_pos = self.inner.seek(SeekFrom::Current(0))?;
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self.inner.write_u32::<LittleEndian>(0)?;
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self.writing_state = WritingState::ChunkOpen {ident, length: 0, length_field_pos };
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self.update_form_size(8)?;
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Ok( () )
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WaveChunkWriter::begin(self, ident)
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}
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pub fn append_data_to_chunk(&mut self, buffer : &[u8]) -> Result<u64,Error> {
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match self.writing_state {
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WritingState::ChunkOpen {ident: _, length, length_field_pos} => {
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self.inner.seek(SeekFrom::End(0))?;
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self.inner.write(buffer)?;
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self.inner.seek(SeekFrom::Start(length_field_pos))?;
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let new_length = length + buffer.len() as u64;
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if new_length >= (u32::MAX as u64) {
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todo!();
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} else {
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self.inner.write_u32::<LittleEndian>(new_length as u32)?;
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self.update_form_size(buffer.len() as u64)?;
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}
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Ok(buffer.len() as u64)
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},
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_ => Err(Error::DataChunkNotPreparedForAppend)
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}
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}
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pub fn end_chunk(&mut self) -> Result<(), Error> {
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match self.writing_state {
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WritingState::ChunkOpen { ident:_, length, length_field_pos : _ } => {
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if length % 2 == 1 {
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self.inner.seek(SeekFrom::End(0))?;
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self.inner.write_u8(0)?;
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self.update_form_size(1)?;
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}
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Ok(())
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},
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WritingState::NoChunk => Ok(())
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}
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}
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}
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impl<W: Write + Seek> WaveWriter<W> { /* Private implementation */
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fn write_format_chunk(&mut self) -> Result<(), Error> {
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let mut buf : Vec<u8> = vec![];
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let mut cursor = Cursor::new(&mut buf);
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cursor.write_wave_fmt(&self.format)?;
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self.append_chunk(FMT__SIG, &buf)
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}
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fn write_fact_chunk(&mut self) -> Result<(), Error> {
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self.append_chunk(FACT_SIG, &[0u8; 4])?;
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Ok(())
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}
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fn write_ds64_reservation(&mut self) -> Result<(),Error> {
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self.append_chunk(JUNK_SIG, &[0u8; 96])?;
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Ok(())
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}
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fn write_framing_filler(&mut self) -> Result<(),Error> {
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let framing = 0x4000;
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let current_length = self.inner.seek(SeekFrom::End(0))?;
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let size_to_add = framing - ((current_length % framing) - 8);
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let chunk_size_to_add = size_to_add - 8;
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let buf = vec![ 0u8; chunk_size_to_add as usize];
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self.append_chunk(ELM1_SIG, &buf)?;
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Ok( () )
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}
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fn append_chunk(&mut self, ident : FourCC, buffer: &[u8]) -> Result<(),Error> {
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self.begin_chunk(ident)?;
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self.append_data_to_chunk(buffer)?;
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self.end_chunk()?;
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Ok(())
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}
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fn update_form_size(&mut self, added_size: u64) -> Result<(),Error> {
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fn increment_form_length(&mut self, amount: u64) -> Result<(), std::io::Error> {
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self.form_length = self.form_length + amount;
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self.inner.seek(SeekFrom::Start(4))?;
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let new_size = added_size + self.form_size;
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if new_size < (u32::MAX as u64) {
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self.inner.write_u32::<LittleEndian>(new_size as u32)?;
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} else {
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self.update_form_size_ds64(new_size)?;
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}
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self.form_size = new_size;
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Ok( () )
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}
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fn update_form_size_ds64(&mut self, new_size: u64) -> Result<(), Error> {
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if self.ds64_sizes.is_none() {
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self.inner.seek(SeekFrom::Start(0))?;
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self.inner.write_fourcc(RF64_SIG)?;
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self.inner.seek(SeekFrom::Start(12))?;
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self.inner.write_fourcc(DS64_SIG)?;
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self.ds64_sizes = Some( HashMap::new() );
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}
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self.inner.seek(SeekFrom::Start(20))?;
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self.inner.write_u64::<LittleEndian>(new_size)?;
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self.inner.write_u32::<LittleEndian>(self.form_length as u32)?;
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Ok(())
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}
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}
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#[test]
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fn test_simple_create() {
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fn test_new() {
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use std::io::Cursor;
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use super::fourcc::ReadFourCC;
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use byteorder::ReadBytesExt;
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let buf = vec![0u8; 0];
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let mut cursor = Cursor::new(buf);
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let format = WaveFmt::new_pcm(48000, 24, 1);
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let w = WaveWriter::new(cursor, format).unwrap();
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cursor = w.into_inner();
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let mut cursor = Cursor::new(vec![0u8;0]);
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let format = WaveFmt::new_pcm(4800, 24, 1);
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WaveWriter::new(&mut cursor, format).unwrap();
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cursor.seek(SeekFrom::Start(0)).unwrap();
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assert_eq!( cursor.read_fourcc().unwrap(), RIFF_SIG);
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assert_eq!(cursor.read_fourcc().unwrap(), RIFF_SIG);
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let form_size = cursor.read_u32::<LittleEndian>().unwrap();
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assert_eq!( cursor.read_fourcc().unwrap(), WAVE_SIG);
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assert_eq!( cursor.read_fourcc().unwrap(), JUNK_SIG);
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let junk_size = cursor.read_u32::<LittleEndian>().unwrap();
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cursor.seek(SeekFrom::Current(junk_size as i64)).unwrap();
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assert_eq!( cursor.read_fourcc().unwrap(), FMT__SIG);
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assert_eq!(cursor.read_fourcc().unwrap(), WAVE_SIG);
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assert_eq!(cursor.read_fourcc().unwrap(), FMT__SIG);
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let fmt_size = cursor.read_u32::<LittleEndian>().unwrap();
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cursor.seek(SeekFrom::Current(fmt_size as i64)).unwrap();
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assert_eq!(form_size, fmt_size + 8 + 4);
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assert_eq!( cursor.read_fourcc().unwrap(), ELM1_SIG);
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let junk2_size = cursor.read_u32::<LittleEndian>().unwrap();
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cursor.seek(SeekFrom::Current(junk2_size as i64)).unwrap();
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assert_eq!( form_size , junk2_size + junk_size + fmt_size + 4 + 8 * 3);
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}
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}
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