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Audio data extraction

master
Matteo Cypriani 4 years ago
parent
commit
2e74951628
5 changed files with 99 additions and 1 deletions
  1. +4
    -1
      src/cue_sheet/mod.rs
  2. +8
    -0
      src/error.rs
  3. +1
    -0
      src/lib.rs
  4. +9
    -0
      src/main.rs
  5. +77
    -0
      src/raw_audio.rs

+ 4
- 1
src/cue_sheet/mod.rs View File

@ -10,7 +10,10 @@ use ::metadata::cuex::NrgCuexTrack;
/// Writes the cue sheet for `image_name` into a file.
///
/// `metadata` is the metadata extracted from `image_name` by nrgrip::metadata.
/// - `image_name` is the name of the input NRG file.
/// - `metadata` is the metadata extracted from `image_name` by
/// nrgrip::metadata.
///
/// The output file's name is derived from `image_name`.
pub fn write_cue_sheet(image_name: &String, metadata: &NrgMetadata)
-> Result<(), NrgError> {


+ 8
- 0
src/error.rs View File

@ -12,6 +12,8 @@ pub enum NrgError {
NrgFormatV1,
NrgChunkId,
NoNrgCue,
AudioReadError,
AudioWriteError
}
impl fmt::Display for NrgError {
@ -22,6 +24,8 @@ impl fmt::Display for NrgError {
NrgError::NrgFormatV1 => write!(f, "NRG v1 format is not handled."),
NrgError::NrgChunkId => write!(f, "NRG chunk ID unknown."),
NrgError::NoNrgCue => write!(f, "NRG cue sheet chunk absent."),
NrgError::AudioReadError => write!(f, "Error reading raw audio."),
NrgError::AudioWriteError => write!(f, "Error writing raw audio."),
}
}
}
@ -34,6 +38,8 @@ impl Error for NrgError {
NrgError::NrgFormatV1 => "NRG format v1",
NrgError::NrgChunkId => "NRG chunk ID",
NrgError::NoNrgCue => "No NRG cue",
NrgError::AudioReadError => "Audio read error",
NrgError::AudioWriteError => "Audio write error",
}
}
@ -44,6 +50,8 @@ impl Error for NrgError {
NrgError::NrgFormatV1 => None,
NrgError::NrgChunkId => None,
NrgError::NoNrgCue => None,
NrgError::AudioReadError => None,
NrgError::AudioWriteError => None,
}
}
}


+ 1
- 0
src/lib.rs View File

@ -3,3 +3,4 @@
pub mod error;
pub mod metadata;
pub mod cue_sheet;
pub mod raw_audio;

+ 9
- 0
src/main.rs View File

@ -48,8 +48,17 @@ fn main() {
println!("\n{}", metadata);
// Read and write the cue sheet
println!("\nNow extracting cue sheet...");
if let Err(err) = nrgrip::cue_sheet::write_cue_sheet(&img_name, &metadata) {
println!("Error writing cue sheet: {}", err.to_string());
process::exit(1);
}
// Extract raw audio data
println!("Now extracting raw audio data...");
if let Err(err) = nrgrip::raw_audio::extract_nrg_raw_audio(
&mut fd, &img_name, &metadata) {
println!("Error extracting raw audio data: {}", err.to_string());
}
println!("OK!");
}

+ 77
- 0
src/raw_audio.rs View File

@ -0,0 +1,77 @@
//! Module to extract the raw audio data from an NRG image file.
use std::fs::File;
use std::io::{Seek, SeekFrom, Read, Write};
use ::error::NrgError;
use ::metadata::metadata::NrgMetadata;
/// Extracts the raw audio data from an NRG image.
///
/// - `in_fd` is the handler to the NRG image file.
/// - `image_name` is the name of the input NRG file.
/// - `metadata` is the metadata extracted from `image_name` by
/// nrgrip::metadata.
///
/// The output file's name is derived from `image_name`.
pub fn extract_nrg_raw_audio(in_fd: &mut File,
image_name: &String,
metadata: &NrgMetadata)
-> Result<(), NrgError> {
let skip_bytes = get_daox_track1_index1(metadata);
try!(in_fd.seek(SeekFrom::Start(skip_bytes)));
let file_name = make_output_file_name(image_name);
let mut out_fd = try!(File::create(file_name));
let mut cur_offset = skip_bytes;
while cur_offset < metadata.chunk_offset {
let mut audio_buf = [0u8; 2352];
let mut nbytes = try!(in_fd.read(&mut audio_buf));
if nbytes != 2352 {
return Err(NrgError::AudioReadError);
}
cur_offset += nbytes as u64;
nbytes = try!(out_fd.write(&audio_buf));
if nbytes != 2352 {
return Err(NrgError::AudioWriteError);
}
}
assert_eq!(cur_offset, metadata.chunk_offset);
Ok(())
}
/// Returns the index1 of the first DAOX track in `metadata`, or 0 if there are
/// no DAOX tracks.
fn get_daox_track1_index1(metadata: &NrgMetadata) -> u64 {
if metadata.daox_chunk.is_none() {
return 0;
}
let daox_tracks = &metadata.daox_chunk.as_ref().unwrap().tracks;
if daox_tracks.is_empty() {
return 0;
}
return daox_tracks[0].index1;
}
/// Generates the output file's name from the NRG image's name.
///
/// If `image_name`'s extension is `.nrg` (case-insensitive), the name will be
/// the same as `image_name` with a `.raw` extension instead of `.nrg`.
/// Otherwise, it will be `image_name.raw`.
fn make_output_file_name(image_name: &String) -> String {
let mut name = image_name.clone();
if name.to_lowercase().ends_with(".nrg") {
let newlen = name.len() - 4;
name.truncate(newlen);
}
name.push_str(".raw");
name
}

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