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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).
28 lines
1.4 KiB
Markdown
28 lines
1.4 KiB
Markdown
Tiny fixtures for `tests/audio/decode_extensions.rs`: one per container or codec that
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`DECODE_EXTENSIONS` names and the crate cannot write itself. All are a 0.1 s mono 440 Hz sine
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from ffmpeg's `sine` generator (`F="-y -f lavfi -i sine=frequency=440:duration=0.1 -ac 1"`).
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From SoundCraft (`crates/audio-io/tests/fixtures`), made with ffmpeg 8.0:
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ffmpeg $F -ar 8000 -c:a libmp3lame -b:a 16k tone.mp3
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ffmpeg $F -ar 24000 -c:a mp2 -b:a 32k tone.mp2
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ffmpeg $F -ar 8000 -c:a libvorbis -q:a -1 tone.ogg
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ffmpeg $F -ar 8000 -c:a aac -b:a 16k tone.m4a
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ffmpeg $F -ar 8000 -c:a aac -b:a 16k -f adts tone.aac
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ffmpeg $F -ar 8000 -c:a pcm_s16le tone.caf
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ffmpeg $F -ar 8000 -c:a pcm_s16le tone.mkv
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ffmpeg $F -ar 8000 -c:a libvorbis -q:a -1 tone.webm
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ffmpeg $F -ar 8000 -c:a pcm_s16le -f aiff tone.aifc # AIFF-C "sowt"
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Made here with ffmpeg 9.0.2 (`-bitexact -map_metadata -1` added to `$F`):
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ffmpeg $F -ar 8000 -c:a pcm_s16le tone.mov
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ffmpeg $F -ar 8000 -c:a pcm_s16le -f matroska tone.mka
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ffmpeg $F -ar 48000 -c:a libopus -b:a 16k tone.opus
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ffmpeg $F -ar 48000 -c:a ac3 -b:a 64k tone.ac3
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ffmpeg $F -ar 48000 -c:a eac3 -b:a 64k tone.eac3
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`silence.mp1` has no ffmpeg encoder. It is four hand-built MPEG-1 Layer I frames (mono, 32 kHz,
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32 kbit/s, 48 bytes each: header `FF FF 18 C0`, all subband allocations zero), which decode to
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silence.
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