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Update parsing of ACID chunk in WAV files.

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This commit is contained in:
Erik de Castro Lopo 2004-10-27 10:46:36 +00:00
parent 6f707349f0
commit b5c03a45a4
2 changed files with 42 additions and 13 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2004-10-27 Erik de Castro Lopo <erikd AT mega-nerd DOT com>
* src/wav.c
Update ACID chunk parsing.
2004-10-23 Erik de Castro Lopo <erikd AT mega-nerd DOT com>
* src/common.h src/sndfile.c

50
src/wav.c
View File

@ -1312,14 +1312,28 @@ wav_read_smpl_chunk (SF_PRIVATE *psf, unsigned int chunklen)
** The acid chunk goes a little something like this:
**
** 4 bytes 'acid'
** 4 bytes (int) length of chunk
** 4 bytes (int) ???
** 4 bytes (int) length of chunk starting at next byte
**
** 4 bytes (int) type of file:
** this appears to be a bit mask,however some combinations
** are probably impossible and/or qualified as "errors"
**
** 0x01 On: One Shot Off: Loop
** 0x02 On: Root note is Set Off: No root
** 0x04 On: Stretch is On, Off: Strech is OFF
** 0x08 On: Disk Based Off: Ram based
** 0x10 On: ?????????? Off: ????????? (Acidizer puts that ON)
**
** 2 bytes (short) root note
** 2 bytes (short) ???
** 4 bytes (float) ???
** 4 bytes (int) number of beats
** 2 bytes (short) meter denominator
** 2 bytes (short) meter numerator
** if type 0x10 is OFF : [C,C#,(...),B] -> [0x30 to 0x3B]
** if type 0x10 is ON : [C,C#,(...),B] -> [0x3C to 0x47]
** (both types fit on same MIDI pitch albeit different octaves, so who cares)
**
** 2 bytes (short) ??? always set to 0x8000
** 4 bytes (float) ??? seems to be always 0
** 4 bytes (int) number of beats
** 2 bytes (short) meter numerator - always 4 in SF/ACID
** 2 bytes (short) meter denominator - always 4 in SF/ACID
** 4 bytes (float) tempo
**
*/
@ -1327,26 +1341,36 @@ wav_read_smpl_chunk (SF_PRIVATE *psf, unsigned int chunklen)
static int
wav_read_acid_chunk (SF_PRIVATE *psf, unsigned int chunklen)
{ unsigned int bytesread = 0 ;
int beats ;
int beats, flags ;
short rootnote, q1, meter_denom, meter_numer ;
float q2, q3, tempo ;
float q2, tempo ;
chunklen += (chunklen & 1) ;
bytesread += psf_binheader_readf (psf, "e224f", &rootnote, &q1, &q2, &q3) ;
bytesread += psf_binheader_readf (psf, "e422f", &flags, &rootnote, &q1, &q2) ;
LSF_SNPRINTF (psf->u.cbuf, sizeof (psf->u.cbuf), "%f", q2) ;
psf_log_printf (psf, " Root note : %d\n ???? : %d\n ???? : %s\n ???? : %d\n",
rootnote, q1, psf->u.cbuf, q3) ;
psf_log_printf (psf, " Flags : 0x%04x (%s,%s,%s,%s,%s)\n", flags,
(flags & 0x01) ? "OneShot" : "Loop",
(flags & 0x02) ? "RootNoteValid" : "RootNoteInvalid",
(flags & 0x04) ? "StretchOn" : "StretchOff",
(flags & 0x08) ? "DiskBased" : "RAMBased",
(flags & 0x10) ? "??On" : "??Off") ;
psf_log_printf (psf, " Root note : 0x%x\n ???? : 0x%04x\n ???? : %s\n",
rootnote, q1, psf->u.cbuf) ;
bytesread += psf_binheader_readf (psf, "e422f", &beats, &meter_denom, &meter_numer, &tempo) ;
LSF_SNPRINTF (psf->u.cbuf, sizeof (psf->u.cbuf), "%f", tempo) ;
psf_log_printf (psf, " Beats : %d\n Meter : %d/%d\n Tempo : %s\n",
beats, meter_denom, meter_numer, psf->u.cbuf) ;
beats, meter_numer, meter_denom, psf->u.cbuf) ;
psf_binheader_readf (psf, "j", chunklen - bytesread) ;
return 0 ;
} /* wav_read_acid_chunk */
/*
** Do not edit or modify anything in this comment block.
** The arch-tag line is a file identity tag for the GNU Arch