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cf15661e9c
Some mpeg versions use LSF (low sampling frequency) when encoding low sample rates which changes a bit how the side info is layed out. Also skip trying to separate data and other_data as after reading up a bit on how main data begin and bit reservoir works i think it was done incorrectly. To know the real audio data length i think you need to decode the huffman tables. Instead just have a "audio_data" field which are the bits with audo data for current and possibly following frames.
78 lines
6.2 KiB
Plaintext
78 lines
6.2 KiB
Plaintext
$ fq -i -d mp3 . test.mp3
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mp3> grep(44100, "ID", "^ID3$", "^ID.?$", "Info", "magic", "\u00ff", [0x49, 0x44])
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x20| 40| @|.frames[0].header.sample_rate: 44100 (0)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0xe0| 50 | P |.frames[1].header.sample_rate: 44100 (0)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x1b0| 52 | R |.frames[2].header.sample_rate: 44100 (0)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x1c0| 11 4b 36 4a 08 83 58 c9| .K6J..X.|.frames[2].audio_data: raw bits
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0x1d0|20 d4 29 52 98 c8 c8 f9 13 80 40 24 bc 91 23 42| .)R......@$..#B|
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* |until 0x283.7 (end) (188) | |
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x40| 49 6e 66 6f | Info |.frames[0].xing.header: "Info"
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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mp3> vgrep(44100, "ID", "^ID3$", "^ID.?$", "Info", "magic", "\u00ff", [0x49, 0x44])
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x20| 40| @|.frames[0].header.sample_rate: 44100 (0)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0xe0| 50 | P |.frames[1].header.sample_rate: 44100 (0)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x1b0| 52 | R |.frames[2].header.sample_rate: 44100 (0)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x40| 49 6e 66 6f | Info |.frames[0].xing.header: "Info"
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mp3> fgrep(44100, "ID", "^ID3$", "^ID.?$", "Info", "magic", "\u00ff", [0x49, 0x44])
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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mp3> bgrep(44100, "ID", "^ID3$", "^ID.?$", "Info", "magic", "\u00ff", [0x49, 0x44])
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x1c0| 11 4b 36 4a 08 83 58 c9| .K6J..X.|.frames[2].audio_data: raw bits
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0x1d0|20 d4 29 52 98 c8 c8 f9 13 80 40 24 bc 91 23 42| .)R......@$..#B|
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* |until 0x283.7 (end) (188) | |
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x40| 49 6e 66 6f | Info |.frames[0].xing.header: "Info"
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|49 44 33 |ID3 |.headers[0].magic: "ID3" (valid)
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mp3> "64ff65ff66" | fromhex | bgrep("\u00ff"; "b")
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x0|64 ff 65 ff 66| |d.e.f| |.: raw bits 0x0-0x4.7 (5)
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mp3> grep_by(. == 44100)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x20| 40| @|.frames[0].header.sample_rate: 44100 (0)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0xe0| 50 | P |.frames[1].header.sample_rate: 44100 (0)
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|
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0x1b0| 52 | R |.frames[2].header.sample_rate: 44100 (0)
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mp3> grep_by(format == "id3v2")
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|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|.headers[0]{}: header (id3v2)
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0x00|49 44 33 |ID3 | magic: "ID3" (valid)
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0x00| 04 | . | version: 4
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0x00| 00 | . | revision: 0
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0x00| 00 | . | flags{}:
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0x00| 00 00 00 23 | ...# | size: 35
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0x00| 54 53 53 45 00 00| TSSE..| frames[0:1]:
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0x10|00 0f 00 00 03 4c 61 76 66 35 38 2e 34 35 2e 31|.....Lavf58.45.1|
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0x20|30 30 00 |00. |
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0x20| 00 00 00 00 00 00 00 00 00 00 | .......... | padding: raw bits (all zero)
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mp3> ^D
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