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Dylan M. Taylor
0e60ef3b0a
DECODE_EXTENSIONS lists the file extensions of the formats decode reads. EncodeFormat gains ALL, extension() and mime_type(). SoundCraft kept these tables in its own FileFormat type; they are format knowledge, so they live here. A WAV with many empty data chunks parsed in quadratic time: whether an empty data chunk is followed by chunks alone was decided for every one of them, by walking the rest of the file. Only the first data chunk is used, so it is decided once. Tests SoundCraft added to audio-io after craft-audio was cut from it: Matroska element sizes beyond the file, an AIFF channel count with the sign bit set, probe and decode agreeing on the length of AAC in MP4, and one small file per decodable extension (tests/fixtures).
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Tiny fixtures for tests/audio/decode_extensions.rs: one per container or codec that
DECODE_EXTENSIONS names and the crate cannot write itself. All are a 0.1 s mono 440 Hz sine
from ffmpeg's sine generator (F="-y -f lavfi -i sine=frequency=440:duration=0.1 -ac 1").
From SoundCraft (crates/audio-io/tests/fixtures), made with ffmpeg 8.0:
ffmpeg $F -ar 8000 -c:a libmp3lame -b:a 16k tone.mp3
ffmpeg $F -ar 24000 -c:a mp2 -b:a 32k tone.mp2
ffmpeg $F -ar 8000 -c:a libvorbis -q:a -1 tone.ogg
ffmpeg $F -ar 8000 -c:a aac -b:a 16k tone.m4a
ffmpeg $F -ar 8000 -c:a aac -b:a 16k -f adts tone.aac
ffmpeg $F -ar 8000 -c:a pcm_s16le tone.caf
ffmpeg $F -ar 8000 -c:a pcm_s16le tone.mkv
ffmpeg $F -ar 8000 -c:a libvorbis -q:a -1 tone.webm
ffmpeg $F -ar 8000 -c:a pcm_s16le -f aiff tone.aifc # AIFF-C "sowt"
Made here with ffmpeg 9.0.2 (-bitexact -map_metadata -1 added to $F):
ffmpeg $F -ar 8000 -c:a pcm_s16le tone.mov
ffmpeg $F -ar 8000 -c:a pcm_s16le -f matroska tone.mka
ffmpeg $F -ar 48000 -c:a libopus -b:a 16k tone.opus
ffmpeg $F -ar 48000 -c:a ac3 -b:a 64k tone.ac3
ffmpeg $F -ar 48000 -c:a eac3 -b:a 64k tone.eac3
silence.mp1 has no ffmpeg encoder. It is four hand-built MPEG-1 Layer I frames (mono, 32 kHz,
32 kbit/s, 48 bytes each: header FF FF 18 C0, all subband allocations zero), which decode to
silence.