I have verified that using the "-t wavpcm" option results in 24-bit wav files which the Tascam DP-32SD can understand. I have summarized the technical details and have filed a bug report on the Tascam forum that discuses this unit.
- Sam 2015-09-20 19:17 GMT-07:00 Måns Rullgård <m...@mansr.com>: > Sam Trenholme <strenholme.use...@gmail.com> writes: > >> Without modifying the header, the Tascam DP-32SD (a stand-alone >> digital multitrack recorder) is unable to “grok” (acknowledge as a >> valid .WAV file) a 24-bit 44.1khz monophonic .WAV file generated by >> sox. >> >> Because of this, the Tascam DP-32SD is unable to import 24-bit/44.1 >> SoX-generated files via the “Audio Depot” unless the .WAV header is >> altered. >> >> ==Steps to reproduce== >> >> Use the SoX program to generate a 24-bit wav file. For example: >> >> sox foo.wav -b24 bar.wav gain -9 > > Try adding "-t wavpcm" before the output filename. > >> Technical details >> >> A Tascam DP-32SD has, for an “audio depot” 24/44.1 file header, the >> following bytes (this is “hexdump” format; the numbers on the left are >> hexadecimal numbers; the ASCII that follows is a representation of the >> data): >> >> 00000000 52 49 46 46 XX XX XX XX 57 41 56 45 66 6d 74 20 |RIFF....WAVEfmt | >> 00000010 10 00 00 00 01 00 01 00 44 ac 00 00 cc 04 02 00 |........D.......| >> 00000020 03 00 18 00 64 61 74 61 WW WW WW WW WW WW WW WW |....data........| > > This is a standard, original Microsoft WAVEFORMAT header. The value > 0x0001 at offset 0x14 indicates PCM data. Although the header structure > can encode arbitrary values, only 8-bit and 16-bit PCM should use this > format. > >> SoX, on the other hand, generates a 24/44.1 wav file with the >> following header: >> >> 00000000 52 49 46 46 XX XX XX XX 57 41 56 45 66 6d 74 20 |RIFF....WAVEfmt | >> 00000010 28 00 00 00 fe ff 01 00 44 ac 00 00 cc 04 02 00 |(.......D.......| >> 00000020 03 00 18 00 16 00 18 00 04 00 00 00 01 00 00 00 |................| >> 00000030 00 00 10 00 80 00 00 aa 00 38 9b 71 66 61 63 74 |.........8.qfact| >> 00000040 04 00 00 00 14 f5 5f 00 64 61 74 61 WW WW WW WW |......_.data....| > > This is a WAVEFORMATEXTENSIBLE header, indicated by the format tag > 0xfffe at file offset 0x14. This header adds additional fields at the > end allowing arbitrary bit depths as well as various other information. > It should be used whenever the bit depth is not 8 or 16. > > Sox is doing the right thing in creating a WAVEFORMATEXTENSIBLE header > for 24-bit data, but apparently the Tascam software can't understand > this format (it's not alone in this, unfortunately), instead applying > less strict rules for the basic WAVEFORMAT header (everybody does this, > and rightly so). > > The "-t wavpcm" option forces sox to use the short WAVEFORMAT header > even when this goes against the spec. > > For more details, see https://msdn.microsoft.com/en-us/library/dd390971.aspx > > -- > Måns Rullgård > m...@mansr.com ------------------------------------------------------------------------------ _______________________________________________ SoX-devel mailing list SoX-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sox-devel
