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Ignore decoder specific info for object types 0x69 and 0x6B #227

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Ignore decoder specific info for object types 0x69 and 0x6B #227

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18 changes: 14 additions & 4 deletions mp4parse/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -379,6 +379,7 @@ pub enum SampleEntry {
#[allow(non_camel_case_types)]
#[derive(Debug, Default)]
pub struct ES_Descriptor {
pub object_profile: u8,
pub audio_codec: CodecType,
pub audio_object_type: Option<u16>,
pub extended_audio_object_type: Option<u16>,
Expand Down Expand Up @@ -2452,7 +2453,16 @@ fn find_descriptor(data: &[u8], esds: &mut ES_Descriptor) -> Result<()> {
read_dc_descriptor(descriptor, esds)?;
}
DECODER_SPECIFIC_TAG => {
read_ds_descriptor(descriptor, esds)?;
match esds.object_profile {
0x69 | 0x6B => {
// Could parse these object types' decoder specific info
// to discover the MPEG audio layer, etc., if needed.
break;
}
_ => {
read_ds_descriptor(descriptor, esds)?;
}
};
}
_ => {
debug!("Unsupported descriptor, tag {}", tag);
Expand Down Expand Up @@ -2647,7 +2657,7 @@ fn read_surround_channel_count(bit_reader: &mut BitReader, channels: u8) -> Resu
/// See ISO 14496-1:2010 § 7.2.6.6
fn read_dc_descriptor(data: &[u8], esds: &mut ES_Descriptor) -> Result<()> {
let des = &mut Cursor::new(data);
let object_profile = des.read_u8()?;
esds.object_profile = des.read_u8()?;

// Skip uninteresting fields.
skip(des, 12)?;
Expand All @@ -2656,9 +2666,9 @@ fn read_dc_descriptor(data: &[u8], esds: &mut ES_Descriptor) -> Result<()> {
find_descriptor(&data[des.position().try_into()?..data.len()], esds)?;
}

esds.audio_codec = match object_profile {
esds.audio_codec = match esds.object_profile {
0x40 | 0x41 => CodecType::AAC,
0x6B => CodecType::MP3,
0x69 | 0x6B => CodecType::MP3,
_ => CodecType::Unknown,
};

Expand Down