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use nom::{IResult as NomResult, le_u16 as parse_le_u16, le_u32 as parse_le_u32, le_u8 as parse_u8};
use swf_tree as ast;
pub fn sound_rate_from_id(sound_rate_id: u8) -> ast::SoundRate {
match sound_rate_id {
0 => ast::SoundRate::SoundRate5500,
1 => ast::SoundRate::SoundRate11000,
2 => ast::SoundRate::SoundRate22000,
3 => ast::SoundRate::SoundRate44000,
_ => panic!("Unexpected sound rate id"),
}
}
pub fn audio_coding_format_from_id(audio_coding_format_id: u8) -> ast::AudioCodingFormat {
match audio_coding_format_id {
0 => ast::AudioCodingFormat::UncompressedNativeEndian,
1 => ast::AudioCodingFormat::Adpcm,
2 => ast::AudioCodingFormat::Mp3,
3 => ast::AudioCodingFormat::UncompressedLittleEndian,
4 => ast::AudioCodingFormat::Nellymoser16,
5 => ast::AudioCodingFormat::Nellymoser8,
6 => ast::AudioCodingFormat::Nellymoser,
11 => ast::AudioCodingFormat::Speex,
_ => panic!("Unexpected audio coding format id"),
}
}
pub fn is_uncompressed_audio_coding_format(format: &ast::AudioCodingFormat) -> bool {
match format {
ast::AudioCodingFormat::UncompressedNativeEndian => true,
ast::AudioCodingFormat::UncompressedLittleEndian => true,
_ => false,
}
}
pub fn parse_sound_info(input: &[u8]) -> NomResult<&[u8], ast::SoundInfo> {
do_parse!(
input,
flags: parse_u8 >>
has_in_point: value!((flags & (1 << 0)) != 0) >>
has_out_point: value!((flags & (1 << 1)) != 0) >>
has_loops: value!((flags & (1 << 2)) != 0) >>
has_envelope: value!((flags & (1 << 3)) != 0) >>
sync_no_multiple: value!((flags & (1 << 4)) != 0) >>
sync_stop: value!((flags & (1 << 5)) != 0) >>
in_point: cond!(has_in_point, parse_le_u32) >>
out_point: cond!(has_out_point, parse_le_u32) >>
loop_count: cond!(has_loops, parse_le_u16) >>
envelope_records: cond!(has_envelope, length_count!(parse_u8, parse_sound_envelope)) >>
(ast::SoundInfo {
sync_stop,
sync_no_multiple,
in_point,
out_point,
loop_count,
envelope_records,
})
)
}
pub fn parse_sound_envelope(input: &[u8]) -> NomResult<&[u8], ast::SoundEnvelope> {
do_parse!(
input,
pos44: parse_le_u32 >>
left_level: parse_le_u16 >>
right_level: parse_le_u16 >>
(ast::SoundEnvelope {
pos44,
left_level,
right_level,
})
)
}