fn read_dops()

in mp4parse/src/lib.rs [5297:5333]

• 32 lines of code
• 3 McCabe index (conditional complexity)

fn read_dops<T: Read>(src: &mut BMFFBox<T>) -> Result<OpusSpecificBox> {
    let version = src.read_u8()?;
    if version != 0 {
        return Err(Error::Unsupported("unknown dOps (Opus) version"));
    }

    let output_channel_count = src.read_u8()?;
    let pre_skip = be_u16(src)?;
    let input_sample_rate = be_u32(src)?;
    let output_gain = be_i16(src)?;
    let channel_mapping_family = src.read_u8()?;

    let channel_mapping_table = if channel_mapping_family == 0 {
        None
    } else {
        let stream_count = src.read_u8()?;
        let coupled_count = src.read_u8()?;
        let channel_mapping = read_buf(src, output_channel_count.into())?;

        Some(ChannelMappingTable {
            stream_count,
            coupled_count,
            channel_mapping,
        })
    };

    // TODO(kinetik): validate field value ranges.
    Ok(OpusSpecificBox {
        version,
        output_channel_count,
        pre_skip,
        input_sample_rate,
        output_gain,
        channel_mapping_family,
        channel_mapping_table,
    })
}