3 intro => 'Comparison of audio compression formats.',
4 keywords => [qw( audio sound codec encoder encoding decode compression file format type mime )],
7 name => '<abbr title="MPEG-1 Audio Layer III">MP3</abbr>',
22 name => '<abbr title="Advanced Audio Coding">AAC</abbr>',
27 name => '<abbr title="Adaptive Transform Acoustic Coding">ATRAC</abbr>',
34 mime => 'audio/musepack',
41 children => [qw( quality limits royalties support )],
44 name => 'compression quality',
45 children => [qw( quality_music quality_speech quality_ll )],
75 children => [qw( channels bitrate latency peeling )],
81 mp3 => [3, 6, 'stereo, extended to upto 5.1'],
87 name => 'bitrate peeling',
89 vorbis => [3, undef, 'yes but "unusable" quality'],
96 name => 'frame size (ms)',
98 mp3 => [3, 26, 'typical version and layer has 1152 samples at 44kHz'],
103 name => 'minimal bitrate',
111 name => 'Streamable',
117 name => 'Fast seeking',
119 mpc => [5, undef, 'indexed'],
120 opus => [3, undef, 'bisection seeking (usually 1 physical seek required if implemented correctly)'],
125 mp3 => [5, undef, 'expired'],
127 opus => [4, undef, 'open and free design'],
128 atrac => [2, undef, 'proprietary, but the original patents have expired'],
129 mpc => [5, undef, 'open format, bsd licensed implementation'],