Audible AAX support

src/mp4box/adrm.rs

@@ -0,0 +1,109 @@
+use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
+
+use serde::Serialize;
+use std::io::{Read, Seek, Write};
+
+use crate::mp4box::*;
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+pub struct AdrmBox {
+    #[serde(serialize_with = "<[_]>::serialize")]
+    pub drm_blob: [u8; 48],
+    pub file_checksum: [u8; 20],
+    #[serde(serialize_with = "<[_]>::serialize")]
+    pub unknown0: [u8; 60],
+}
+
+impl Mp4Box for AdrmBox {
+    fn box_type(&self) -> BoxType {
+        BoxType::AdrmBox
+    }
+
+    fn box_size(&self) -> u64 {
+        156
+    }
+
+    fn to_json(&self) -> Result<String> {
+        Ok(serde_json::to_string(&self).unwrap())
+    }
+
+    fn summary(&self) -> Result<String> {
+        let mut s = String::with_capacity(49);
+        s.push_str("checksum=");
+        for b in self.file_checksum.iter() {
+            s.push_str(&format!("{:02x}", b));
+        }
+        Ok(s)
+    }
+}
+
+impl<R: Read + Seek> ReadBox<&mut R> for AdrmBox {
+    fn read_box(reader: &mut R, size: u64) -> Result<Self> {
+        let start = box_start(reader)?;
+
+        let mut result = AdrmBox {
+            drm_blob: [0u8; 48],
+            file_checksum: [0u8; 20],
+            unknown0: [0u8; 60],
+        };
+
+        reader.read_u32::<BigEndian>()?; // 56
+        reader.read_u32::<BigEndian>()?; // 1
+        reader.read_exact(&mut result.drm_blob)?;
+        reader.read_u32::<BigEndian>()?; // 0
+        reader.read_u32::<BigEndian>()?; // 1
+        reader.read_u32::<BigEndian>()?; // 0
+        reader.read_exact(&mut result.file_checksum)?;
+        reader.read_exact(&mut result.unknown0)?;
+
+        assert_eq!(reader.stream_position()?, start + size);
+
+        Ok(result)
+    }
+}
+
+impl<W: Write> WriteBox<&mut W> for AdrmBox {
+    fn write_box(&self, writer: &mut W) -> Result<u64> {
+        let size = self.box_size();
+        BoxHeader::new(self.box_type(), size).write(writer)?;
+
+        writer.write_u32::<BigEndian>(56)?;
+        writer.write_u32::<BigEndian>(1)?;
+        writer.write_all(&self.drm_blob)?;
+        writer.write_u32::<BigEndian>(0)?;
+        writer.write_u32::<BigEndian>(1)?;
+        writer.write_u32::<BigEndian>(0)?;
+        writer.write_all(&self.file_checksum)?;
+        writer.write_all(&self.unknown0)?;
+
+        Ok(size)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::mp4box::BoxHeader;
+    use std::io::Cursor;
+
+    #[test]
+    fn test_adrm() {
+        let src_box = AdrmBox {
+            drm_blob: [29u8; 48],
+            file_checksum: [244u8; 20],
+            unknown0: [113u8; 60],
+        };
+
+        let mut buf = Vec::new();
+        src_box.write_box(&mut buf).unwrap();
+        assert_eq!(buf.len(), src_box.box_size() as usize);
+
+        let mut reader = Cursor::new(&buf);
+        let header = BoxHeader::read(&mut reader).unwrap();
+        assert_eq!(header.name, BoxType::AdrmBox);
+        assert_eq!(src_box.box_size(), header.size);
+
+        let dst_box = AdrmBox::read_box(&mut reader, header.size).unwrap();
+        assert_eq!(src_box, dst_box);
+    }
+}

src/mp4box/mod.rs

@@ -62,6 +62,7 @@ use std::io::{Read, Seek, SeekFrom, Write};
 
 use crate::*;
 
+pub(crate) mod adrm;
 pub(crate) mod avc1;
 pub(crate) mod co64;
 pub(crate) mod ctts;
@@ -237,6 +238,7 @@ boxtype! {
     DayBox => 0xa9646179,
     CovrBox => 0x636f7672,
     DescBox => 0x64657363,
+    AdrmBox => 0x6164726d,
     WideBox => 0x77696465
 }
 

src/mp4box/mp4a.rs

@@ -2,7 +2,7 @@ use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 use serde::Serialize;
 use std::io::{Read, Seek, Write};
 
-use crate::mp4box::*;
+use crate::{adrm::AdrmBox, mp4box::*};
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize)]
 pub struct Mp4aBox {
@@ -12,6 +12,7 @@ pub struct Mp4aBox {
 
     #[serde(with = "value_u32")]
     pub samplerate: FixedPointU16,
+    pub adrm: Option<AdrmBox>,
     pub esds: Option<EsdsBox>,
 }
 
@@ -22,6 +23,7 @@ impl Default for Mp4aBox {
             channelcount: 2,
             samplesize: 16,
             samplerate: FixedPointU16::new(48000),
+            adrm: None,
             esds: Some(EsdsBox::default()),
         }
     }
@@ -34,6 +36,7 @@ impl Mp4aBox {
             channelcount: config.chan_conf as u16,
             samplesize: 16,
             samplerate: FixedPointU16::new(config.freq_index.freq() as u16),
+            adrm: None,
             esds: Some(EsdsBox::new(config)),
         }
     }
@@ -89,9 +92,10 @@ impl<R: Read + Seek> ReadBox<&mut R> for Mp4aBox {
         reader.read_u32::<BigEndian>()?; // pre-defined, reserved
         let samplerate = FixedPointU16::new_raw(reader.read_u32::<BigEndian>()?);
 
+        let mut adrm = None;
         let mut esds = None;
-        let current = reader.stream_position()?;
-        if current < start + size {
+        let mut current = reader.stream_position()?;
+        while current < start + size {
             let header = BoxHeader::read(reader)?;
             let BoxHeader { name, size: s } = header;
             if s > size {
@@ -100,17 +104,27 @@ impl<R: Read + Seek> ReadBox<&mut R> for Mp4aBox {
                 ));
             }
 
-            if name == BoxType::EsdsBox {
-                esds = Some(EsdsBox::read_box(reader, s)?);
+            match name {
+                BoxType::AdrmBox => {
+                    adrm = Some(AdrmBox::read_box(reader, s)?);
+                }
+                BoxType::EsdsBox => {
+                    esds = Some(EsdsBox::read_box(reader, s)?);
+                }
+                _ => {
+                    skip_box(reader, s)?;
+                }
             }
-            skip_bytes_to(reader, start + size)?;
+
+            current = reader.stream_position()?;
         }
 
         Ok(Mp4aBox {
             data_reference_index,
             channelcount,
             samplesize,
             samplerate,
+            adrm,
             esds,
         })
     }
@@ -605,6 +619,7 @@ mod tests {
             channelcount: 2,
             samplesize: 16,
             samplerate: FixedPointU16::new(48000),
+            adrm: None,
             esds: Some(EsdsBox {
                 version: 0,
                 flags: 0,
@@ -647,6 +662,7 @@ mod tests {
             channelcount: 2,
             samplesize: 16,
             samplerate: FixedPointU16::new(48000),
+            adrm: None,
             esds: None,
         };
         let mut buf = Vec::new();

src/mp4box/stsd.rs

@@ -107,6 +107,10 @@ impl<R: Read + Seek> ReadBox<&mut R> for StsdBox {
             BoxType::Tx3gBox => {
                 tx3g = Some(Tx3gBox::read_box(reader, s)?);
             }
+            // aavd
+            BoxType::UnknownBox(0x61617664) => {
+                mp4a = Some(Mp4aBox::read_box(reader, s)?);
+            }
             _ => {}
         }