Hello all,I recently upgraded the libFLAC used in my application Max (http:// sbooth.org/Max/) to 1.1.3 and added preliminary support for album art. During the upgrade I evidently made some coding mistakes with interesting results. I've combed everything over and can't quite see the problems. I've become somewhat frustrated because my code didn't really change significantly from my usage of the 1.1.2 APIs yet things don't work like they did previously.
My first issue is this: files generated by my application are reported as having "ERROR, MD5 signature mismatch" when tested with flac -t. I am at a loss as to why! When I set FLAC__stream_encoder_set_verify to true no errors are reported during the encode. Has anyone seen anything like this? The source for my encoder may be viewed at http://macaudiox.svn.sourceforge.net/viewvc/ macaudiox/trunk/Encoders/FLACEncoder.m?view=markup if anyone is curious.
The second issue is likely more serious. When I attempt to add album art to one of the FLAC files I've created (using the level 2 metadata interface), the files are becoming corrupt (in a sense). Testing with flac-t indicates "ERROR, --until value is before --skip point". Interestingly, the file seems to work with metaflac:
METADATA block #0
type: 0 (STREAMINFO)
is last: false
length: 34
minimum blocksize: 4608 samples
maximum blocksize: 4608 samples
minimum framesize: 893 bytes
maximum framesize: 14662 bytes
sample_rate: 44100 Hz
channels: 2
bits-per-sample: 16
total samples: 9626736
MD5 signature: a9b57ffa2020017504e551c6ded0e092
METADATA block #1
type: 4 (VORBIS_COMMENT)
is last: false
length: 336
vendor string: reference libFLAC 1.1.3 20061120
comments: 7
comment[0]: ALBUM=Hope Floats
comment[1]: ARTIST=Lyle Lovett
comment[2]: TITLE=Smile
comment[3]: TRACKNUMBER=11
comment[4]: TRACKTOTAL=13
comment[5]: ENCODER=Max 0.7.1b
comment[6]: ENCODING=FLAC settings: exhaustiveModelSearch:0
midSideStereo:1 looseMidSideStereo:0 QLPCoeffPrecision:0,
minResidualPartitionOrder:0, maxResidualPartitionOrder:4, maxLPCOrder:8
METADATA block #2 type: 6 (PICTURE) is last: false length: 32 type: 3 (Cover (front)) MIME type: image/png description: width: 800 height: 600 depth: 24 colors: 0 (unindexed) data length: 685873 data:00000000: 89 50 4E 47 0D 0A 1A 0A 00 00 00 0D 49 48 44 52 .PNG........IHDR
! <snip> !
000A7730: 82 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .
METADATA block #3
type: 1 (PADDING)
is last: true
length: 7860
Obviously I am doing something wrong, but again I'm not sure what.
The tagging/album art source code is at http://
macaudiox.svn.sourceforge.net/viewvc/macaudiox/trunk/Tasks/
EncoderTasks/FLACEncoderTask.m?view=markup for the curious.
Does anyone have any ideas? Stephen
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