FLAC Agent Build: Difference between revisions

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| 1339 || SDC || Find Metadata || '''fLaC''' </br> '''0x_664C6143''' || Verifying 8 bits at a time that file starts with fLAc.
| 1339 || SDC || Find Metadata || '''fLaC''' </br> '''0x_664C6143''' || Verifying 8 bits at a time that file starts with fLAc.
|-
|-
| 1394 || SDC || Read Metadata || '''0b_0''' || Read 1 bit to determine last metadata block..
|-
| 1398 || SDC || Read Metadata || '''0b_0000000''' || Read 7 bits. Metadata Type 0  Streaminfo?
|-
| 1401 || SDC || Read Metadata || '''0x_000022''' || Read 24 bits 0x_22 indicating length .
|-
| 1578 || SDC || Read StreamInfo|| '''0x664C614300000022''' || Read 34 bits 0x_22 indicating length into Streaminfo structure
# '''0x1000''' 4096 Minimum Blocksize 16 bits
# '''0x1000''' 4096 Maximum Blocksize 16 bits
# '''0x000159''' 345 Minimum Framesize 24 bits
# '''0x001D88''' 7560 Maximum Framesize 24 bits
# '''0x2EE00''' 192000 Samplerate 20 bits
# '''0b001''' 1 Channels 3 bits + 1 = 2 Channels
# '''0b10111''' 23 5 bits Bits per sample = 23 + 1
# '''0x004BE30D0''' 79.573,200 36 bits number of samples
# '''mdsum''' 16 Bytes (8*16 bits)
# ''skip rest of block length(34) - used bits(272)/8 = 0
|-
| Example || Example || Example || Example || Example  
| Example || Example || Example || Example || Example  
|-
|-
| Example || Example || Example || Example || Example  
| Example || Example || Example || Example || Example  
|}
|}
# SDC 1339 Read 8 bits at a time start of file verifying '''fLAc''' '''0x_664C 6143''' at start of file. 
#


===[https://xiph.org/flac/documentation_format_overview.html Flac overview]===
===[https://xiph.org/flac/documentation_format_overview.html Flac overview]===

Revision as of 21:00, 21 November 2024


EditDate 2024-08-06

Related Threads: FLAC Agent

I am building a self-learning FLAC Agent and this will track the trials and tribulations of the build here.

I decided to loose my agent against flac files on the NVDIA GPU I have so closed on using C/C++ and CUDA.

Got linker to work. created a.out in Debug directory

Corrected the linker so it's now debuggable and gdb allows me to see assembler code so I'm finally talking directly to the machine again.

Brings me back.Web References https://developer.nvidia.com/cuda-toolkit, https://xiph.org/flac/, https://ftp.osuosl.org/pub/xiph/releases/flac/

I want to build an agent that will read flac music files and identify patterns in them. Once it has the patterns identified I want to see if can draw images in line with the evolving songs and long term improvise based on optimum patterns. Very long term may play sounds that draw a message the machine wants to tell us.

Log

--Johnny (talk) 17:41, 21 November 2024 (UTC) Printed off stream_decoder.c from FLAC xiph code and tracing through documenting reads from file. So far seems they do way more 8 bit and less reads than I'll need. See below for sequence of reads.

—Johnny (talk) 20:53, 14 November 2024 (UTC) 2 break throughs today. Found shorten a program from Tony Robinson at Cambridge that is the compression logic behind flac and it’s in C. File:Robinson tr156.ps


—Johnny (talk) 15:43, 14 November 2024 (UTC) Well I think I figured it out, going to check this afternoon. In the export session I was sending both mono tracks to the left and right stereo channels so naturally they were identical. Garbage in garbage out. Going to try splitting them. Top voice to right channel and bottom guitar to the left hand of God. —Johnny (talk) 12:58, 14 November 2024 (UTC) Tan into core problem last night. Channel/Track 0===1. Need to determine where in file creation scheme this is happening.

--Johnny (talk) 11:02, 29 October 2024 (UTC) Reading the flac file and starting to breakdown metadata. Expect to lift and streamline decoding code. Just found out we can create our own metadata bloc and hope to store successive passes of agent there.

--Johnny (talk) 20:51, 6 August 2024 (UTC) Got linker to work.

--Johnny (talk) 19:14, 6 August 2024 (UTC) First had to get a working version of Eclipse that ran on the version of Ubuntu I had. This required updating Eclipse to include the development version so I am currently running Eclipse version=4.32.0 and Ubuntu Oracular Oriole (development branch) which was the only version I found that allowed my instruction debug due to comaptibility issues after Ubuntu updated to Wayland from X11.

Once I had a working development environment I install [ttps://ftp.osuosl.org/pub/xiph/releases/flac/ libFLAC] Unfortunately I've been unable to get a clean link in the development environment so I'm now trying Configure C project with cmake in eclipse manual method to assemble and successfully compile decoder.

Analyze flac stream

The math behind it all File:Robinson tr156.ps. 

0000:0000 | 66 4C 61 43  00 00 00 22  10 00 10 00  00 01 59 00 | fLaC..."......Y.
0000:0010 | 1D 88 2E E0  03 70 04 BE  30 D0 4F CA  4A C4 B1 96 | ...à.p.¾0ÐOÊJı.
0000:0020 | E4 DE 2B A3  C8 66 BD 20  A4 31 03 00  02 F4 00 00 | äÞ+£Èf½ ¤1...ô..
0000:0030 | 00 00 00 00  00 00 00 00  00 00 00 00  00 00 10 00 | ................
0000:0040 | 00 00 00 00  00 1D 40 00  00 00 00 00  00 2C 42 C9 | ......@......,BÉ
0000:0050 | 10 00 00 00  00 00 00 3A  90 00 00 00  00 00 00 5A | .......:.......Z
0000:0060 | B2 A9 10 00  00 00 00 00  00 57 E0 00  00 00 00 00 | ²©.......Wà.....
0000:0070 | 00 89 59 38  10 00 00 00  00 00 00 75  30 00 00 00 | ..Y8.......u0...
0000:0080 | 00 00 00 B8  D2 F6 10 00  00 00 00 00  00 92 70 00 | ...¸Òö........p.
0000:0090 | 00 00 00 00  00 E7 CB 21  10 00 00 00  00 00 00 AF | .....çË!.......¯
0000:00A0 | C0 00 00 00  00 00 01 17  62 29 10 00  00 00 00 00 | À.......b)......
0000:00B0 | 00 CD 10 00  00 00 00 00  01 46 C7 46  10 00 00 00 | .Í.......FÇF....
0000:00C0 | 00 00 00 EA  60 00 00 00  00 00 01 76  C5 7E 10 00 | ...ê`......vÅ~..
0000:00D0 | 00 00 00 00  01 07 A0 00  00 00 00 00  01 A6 43 11 | ...... ......¦C.
0000:00E0 | 10 00 00 00  00 00 01 24  F0 00 00 00  00 00 01 D6 | .......$ð......Ö
0000:00F0 | 3E CE 10 00  00 00 00 00  01 42 40 00  00 00 00 00 | >Î.......B@.....
0000:0100 | 02 06 0E DF  10 00 00 00  00 00 01 5F  90 00 00 00 | ...ß......._....
0000:0110 | 00 00 02 35  51 2A 10 00  00 00 00 00  01 7C D0 00 | ...5Q*.......|Ð.
0000:0120 | 00 00 00 00  02 64 C4 5D  10 00 00 00  00 00 01 9A | .....dÄ]........
0000:0130 | 20 00 00 00  00 00 02 94  36 7C 10 00  00 00 00 00 |  .......6|......
0000:0140 | 01 B7 70 00  00 00 00 00  02 C3 E5 15  10 00 00 00 | .·p......Ãå.....
0000:0150 | 00 00 01 D4  C0 00 00 00  00 00 02 F3  EE 56 10 00 | ...ÔÀ......óîV..
0000:0160 | 00 00 00 00  01 F2 00 00  00 00 00 00  03 23 B2 77 | .....ò.......#²w
0000:0170 | 10 00 00 00  00 00 02 0F  50 00 00 00  00 00 03 53 | ........P......S
0000:0180 | 78 02 10 00  00 00 00 00  02 2C A0 00  00 00 00 00 | x........, .....
0000:0190 | 03 83 A9 4D  10 00 00 00  00 00 02 49  F0 00 00 00 | ..©M.......Ið...
0000:01A0 | 00 00 03 B2  CA 1E 10 00  00 00 00 00  02 67 30 00 | ...²Ê........g0.
0000:01B0 | 00 00 00 00  03 E2 21 59  10 00 00 00  00 00 02 84 | .....â!Y........
0000:01C0 | 80 00 00 00  00 00 04 11  6A 20 10 00  00 00 00 00 | ........j ......
0000:01D0 | 02 A1 D0 00  00 00 00 00  04 40 99 8E  10 00 00 00 | .¡Ð......@......
0000:01E0 | 00 00 02 BF  20 00 00 00  00 00 04 70  26 72 10 00 | ...¿ ......p&r..
0000:01F0 | 00 00 00 00  02 DC 60 00  00 00 00 00  04 9F AC 04 | .....Ü`.......¬.
0000:0200 | 10 00 00 00  00 00 02 F9  B0 00 00 00  00 00 04 CF | .......ù°......Ï
0000:0210 | 68 DE 10 00  00 00 00 00  03 17 00 00  00 00 00 00 | hÞ..............
0000:0220 | 04 FF BB 39  10 00 00 00  00 00 03 34  50 00 00 00 | .ÿ»9.......4P...
0000:0230 | 00 00 05 30  0F 68 10 00  00 00 00 00  03 51 90 00 | ...0.h.......Q..
0000:0240 | 00 00 00 00  05 5F BE 20  10 00 00 00  00 00 03 6E | ....._¾ .......n
0000:0250 | E0 00 00 00  00 00 05 8F  2A F4 10 00  00 00 00 00 | à.......*ô......
0000:0260 | 03 8C 30 00  00 00 00 00  05 BE CE 03  10 00 00 00 | ..0......¾Î.....
0000:0270 | 00 00 03 A9  80 00 00 00  00 00 05 EE  42 EF 10 00 | ...©.......îBï..
0000:0280 | 00 00 00 00  03 C6 C0 00  00 00 00 00  06 1E 70 80 | .....ÆÀ.......p.
0000:0290 | 10 00 00 00  00 00 03 E4  10 00 00 00  00 00 06 4E | .......ä.......N
0000:02A0 | 24 95 10 00  00 00 00 00  04 01 60 00  00 00 00 00 | $.........`.....
0000:02B0 | 06 7E 2E 0E  10 00 00 00  00 00 04 1E  B0 00 00 00 | .~..........°...
0000:02C0 | 00 00 06 AE  5B CB 10 00  00 00 00 00  04 3B F0 00 | ...®[Ë.......;ð.
0000:02D0 | 00 00 00 00  06 DD 86 77  10 00 00 00  00 00 04 59 | .....Ý.w.......Y
0000:02E0 | 40 00 00 00  00 00 07 0D  D9 09 10 00  00 00 00 00 | @.......Ù.......
0000:02F0 | 04 76 90 00  00 00 00 00  07 3D 1D 71  10 00 00 00 | .v.......=.q....
0000:0300 | 00 00 04 93  E0 00 00 00  00 00 07 6C  91 E0 10 00 | ....à......l.à..
0000:0310 | 00 00 00 00  04 B1 20 00  00 00 00 00  07 9A A0 3A | .....± ....... :
0000:0320 | 10 00 04 00  00 28 20 00  00 00 72 65  66 65 72 65 | .....( ...refere
0000:0330 | 6E 63 65 20  6C 69 62 46  4C 41 43 20  31 2E 34 2E | nce libFLAC 1.4.
0000:0340 | 33 20 32 30  32 33 30 36  32 33 00 00  00 00 81 00 | 3 20230623......
0000:0350 | 20 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00 |  ...............
0000:0360 | 00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00 | ................
...
0000:2350 | 00 00 FF F8  C3 8C 00 F0  4E FF 89 81  FF 8E 74 FF | ..ÿøÃ..ðNÿ..ÿ.tÿ
0000:2360 | 92 E9 FF 95  46 FF 91 DF  FF 8E A2 FF  86 61 FF 7B | .éÿ.Fÿ.ßÿ.¢ÿ.aÿ{
0000:2370 | 71 E6 9D E5  5C 51 8B 82  7F A0 C1 74  22 E0 5C B9 | qæ.å\Q... Át"à\¹
0000:2380 | 37 01 44 FD  4F D1 7F 19  7F F6 EE B2  25 0A 26 56 | 7.DýOÑ...öî²%.&V
0000:2390 | 9F 5B 33 62  79 5D 10 9D  13 35 7A 15  24 65 0E B4 | .[3by]...5z.$e.´
0000:23A0 | 2A 4B E2 CB  CE E3 CE 5F  29 4C 5D 64  19 3A 10 10 | *KâËÎãÎ_)L]d.:..
0000:23B0 | 59 1D D1 05  A1 08 D6 D0  48 55 8A 5E  6A 7B A4 C2 | Y.Ñ.¡.ÖÐHU.^j{¤Â
0000:23C0 | 40 12 67 E4  60 3E 4B CB  E3 AD 01 86  B8 6B 7B 62 | @.gä`>KËã...¸k{b

Sequence of reads

Acronyms: 

SDC  = Stream_Decoder.c
BitR - Bitreader.c
Trace of value exchange
Line Number Code Pakage Module Value Opertion Description
1339 SDC Find Metadata fLaC
0x_664C6143		 Verifying 8 bits at a time that file starts with fLAc.
1394 SDC Read Metadata 0b_0 Read 1 bit to determine last metadata block..
1398 SDC Read Metadata 0b_0000000 Read 7 bits. Metadata Type 0 Streaminfo?
1401 SDC Read Metadata 0x_000022 Read 24 bits 0x_22 indicating length .
1578 SDC Read StreamInfo 0x664C614300000022 Read 34 bits 0x_22 indicating length into Streaminfo structure
  1. 0x1000 4096 Minimum Blocksize 16 bits
  2. 0x1000 4096 Maximum Blocksize 16 bits
  3. 0x000159 345 Minimum Framesize 24 bits
  4. 0x001D88 7560 Maximum Framesize 24 bits
  5. 0x2EE00 192000 Samplerate 20 bits
  6. 0b001 1 Channels 3 bits + 1 = 2 Channels
  7. 0b10111 23 5 bits Bits per sample = 23 + 1
  8. 0x004BE30D0 79.573,200 36 bits number of samples
  9. mdsum 16 Bytes (8*16 bits)
  10. skip rest of block length(34) - used bits(272)/8 = 0
Example Example Example Example Example
Example Example Example Example Example

Flac overview

  1. Metadata Block Header
    1. <1> Last-metadata-block flag: '1' if this block is the last metadata block before the audio blocks, '0' otherwise.
    2. <7> BLOCK_TYPE
      1. 0 : STREAMINFO
      2. 1 : PADDING
      3. 2 : APPLICATION
      4. 3 : SEEKTABLE
      5. 4 : VORBIS_COMMENT
      6. 5 : CUESHEET
      7. 6 : PICTURE
      8. 7-126 : reserved
      9. 127 : invalid, to avoid confusion with a frame sync code
    3. <24> Length (in bytes) of metadata to follow (does not include the size of the METADATA_BLOCK_HEADER)
  2. Streaminfo Mandatory Metadata Block
    1. <16> The minimum block size (in samples) used in the stream.
    2. <16> The maximum block size (in samples) used in the stream. (Minimum blocksize == maximum blocksize) implies a fixed-blocksize stream.
    3. <24> The minimum frame size (in bytes) used in the stream. May be 0 to imply the value is not known.
    4. <24> The maximum frame size (in bytes) used in the stream. May be 0 to imply the value is not known.
    5. <20> Sample rate in Hz. Though 20 bits are available, the maximum sample rate is limited by the structure of frame headers to 655350Hz. Also, a value of 0 is invalid.
    6. <3> (number of channels)-1. FLAC supports from 1 to 8 channels
    7. <5> (bits per sample)-1. FLAC supports from 4 to 32 bits per sample.
    8. <36> Total samples in stream. 'Samples' means inter-channel sample, i.e. one second of 44.1Khz audio will have 44100 samples regardless of the number of channels. A value of zero here means the number of total samples is unknown.
    9. <128> MD5 signature of the unencoded audio data. This allows the decoder to determine if an error exists in the audio data even when the error does not result in an invalid bitstream.
    10. NOTES
    11. FLAC specifies a minimum block size of 16 and a maximum block size of 65535, meaning the bit patterns corresponding to the numbers 0-15 in the minimum blocksize and maximum blocksize fields are invalid.
  3. Flac format

Decompose test.flac

  1. 0-4 "fLaC" ID Bytes
0 Metadata Block Streaminfo (Mandatory) 0
Metadata Block Header Streaminfo 0
Value Hex Description Number Bits
fLAc 664C 6143 fLAc Streaminfo Identity tag 4 bytes
0 "0(b)" Not last Metadata Block 1 Bit
0 "0000000(b)" Streaminfo Block type 7 Bits
34 "000022" Metadata Block length hex 22 24 Bits
Metadata Block Data
Value Hex Description Number Bits
4,096 "1000" The minimum block size (in samples) used in the stream. 16 Bits
4,096 "1000" The maximum block size (in samples) used in the stream. 16 Bits
345 "000159" The minimum frame size (in bytes) used in the stream. May be 0 to imply the value is not known. 24 Bits
7,560 "001D88" The minimum frame size (in bytes) used in the stream. May be 0 to imply the value is not known. 24 Bits
192,000 "2EE00" Sample rate in Hz. Though 20 bits are available, the maximum sample rate is limited by the structure of frame headers to 655350Hz. Also, a value of 0 is invalid. 20 Bits
2 "001(b)" (number of channels)-1. FLAC supports from 1 to 8 channels 3 Bits
24 "10111(b)" (bits per sample)-1. FLAC supports from 4 to 32 bits per sample. 5 Bits
79573200 "004BE30D0" Total samples in stream. 'Samples' means inter-channel sample, i.e. one second of 44.1Khz audio will have 44100 samples regardless of the number of channels. A value of zero here means the number of total samples is unknown. 36 Bits
NA "4FCA4AC4B196E4DE2BA3C866BD20A431" MD5 signature of the unencoded audio data. This allows the decoder to determine if an error exists in the audio data even when the error does not result in an invalid bitstream. 128 Bits
1 Metadata Block SeekTable 2A
SeekTable 2A The number of seek points is implied by the metadata header 'length' field, i.e. equal to length / 18.
Value Hex Description Number Bits
0 "0" Not last Metadata Block 1 Bit
3 "0000011(b)" SeekTable Block type 7 Bits
756 "0002F4" Number of seek points 42 24 Bits
Metadata Block Data
Value Hex Description Number Bits
0 Seek point
0 "0000000000000000" 0 Seek Point Sample number of first sample in the target frame. 64 Bits
0 "0000000000000000" Offset (in bytes) from the first byte of the first frame header to the first byte of the target frame's header. 64 Bits
4,096 "1000" Number of samples in the target frame. 16 Bits
1 Seek Point
1916928 "00000000001D4000" 1 Seek Point Sample number of first sample in the target frame. 64 Bits
2900681 "00000000002C42C9" Offset (in bytes) from the first byte of the first frame header to the first byte of the target frame's header. 64 Bits
4,096 "1000" Number of samples in the target frame. 16 Bits
2 Seek Point
3837952 "00000000003A9000" 2 Seek Point Sample number of first sample in the target frame. 64 Bits
5943977 "00000000005AB2A9" Offset (in bytes) from the first byte of the first frame header to the first byte of the target frame's header. 64 Bits
0 "1000" Number of samples in the target frame. 16 Bits
3 Seek Point
5758976 "000000000057E000" 3 Seek Point Sample number of first sample in the target frame. 64 Bits
9001272 "0000000000895938" Offset (in bytes) from the first byte of the first frame header to the first byte of the target frame's header. 64 Bits
4,096 "1000" Number of samples in the target frame. 16 Bits
...Last Seek Point
78716928 "0000000004B12000" Last Seek Point Sample number of first sample in the target frame. 64 Bits
127574074 "00000000079AA03A" Offset (in bytes) from the first byte of the first frame header to the first byte of the target frame's header. 64 Bits
4,096 "1000" Number of samples in the target frame. 16 Bits
2 Metadata Block Vorbis 322
Metadata Block Header 2 (Voorbis) 322
Value Hex Description Number Bits
0 "0(b)" Not last Metadata Block 1 Bit
4 "0000100(b)" Voorbis Block type 7 Bits
40 "000028" Metadata Block length 24 Bits

Block Data not Pertinent at this time

3 Metadata Block Padding 34E
Metadata Block Header 34E (Padding)
Value Hex Description Number Bits
1 "1" Is last Metadata Block 1 Bit
1 "0000001(b)" Padding Block type 7 Bits
8192 "002000" Metadata Block length 24 Bits

Block Data not pertinent

0 Stream Frame Header 2352

Flac Architecture

FF F8 C3 8C 00 F0 4E FF 89 81 FF 8E 74 FF 92 E9 FF 95 46 FF 91 DF FF 8E A2 FF 86 61 FF 7B 71 E6 9D E5

0 Stream Frame 2352
Value Hex Description Number Bits
FFF8 1111 1111 1111 10(b) FFF8 Sync code '11111111111110' 14 bits
0 "0(b)" Reserved: [1] Mandatory Value 0 1 Bit
0 "0(b)" Blocking strategy:
  • 0 : fixed-blocksize stream; frame header encodes the frame number
  • 1 : variable-blocksize stream; frame header encodes the sample number
 1 Bit
C 1100 "1100(b)" Block size in inter-channel samples:
  • 0000 : reserved
  • 0001 : 192 samples
  • 0010-0101 : 576 * (2^(n-2)) samples, i.e. 576/1152/2304/4608
  • 0110 : get 8 bit (blocksize-1) from end of header
  • 0111 : get 16 bit (blocksize-1) from end of header
  • 1000-1111 : 256 * (2^(n-8)) samples, i.e. 256/512/1024/2048/4096/8192/16384/32768
 4 Bits
3 0011 "0011(b)" Sample rate:
  • 0000 : get from STREAMINFO metadata block
  • 0001 : 88.2kHz
  • 0010 : 176.4kHz
  • 0011 : 192kHz
  • 0100 : 8kHz
  • 0101 : 16kHz
  • 0110 : 22.05kHz
  • 0111 : 24kHz
  • 1000 : 32kHz
  • 1001 : 44.1kHz
  • 1010 : 48kHz
  • 1011 : 96kHz
  • 1100 : get 8 bit sample rate (in kHz) from end of header
  • 1101 : get 16 bit sample rate (in Hz) from end of header
  • 1110 : get 16 bit sample rate (in tens of Hz) from end of header
  • 1111 : invalid, to prevent sync-fooling string of 1s
 4 Bits
8 1000 "1000(b)" Channel assignment
  1. 0000-0111 : (number of independent channels)-1. Where defined, the channel order follows SMPTE/ITU-R recommendations. The assignments are as follows:
    1. channel: mono
    2. channels: left, right
    3. channels: left, right, center
    4. channels: front left, front right, back left, back right
    5. channels: front left, front right, front center, back/surround left, back/surround right
    6. channels: front left, front right, front center, LFE, back/surround left, back/surround right
    7. channels: front left, front right, front center, LFE, back center, side left, side right
    8. channels: front left, front right, front center, LFE, back left, back right, side left, side right
  2. 1000 : left/side stereo: channel 0 is the left channel, channel 1 is the side(difference) channel
  3. 1001 : right/side stereo: channel 0 is the side(difference) channel, channel 1 is the right channel
  4. 1010 : mid/side stereo: channel 0 is the mid(average) channel, channel 1 is the side(difference) channel
  5. 1011-1111 : reserved
 4 Bits
C 110 "110(b)" Sample size in bits:
  • 000 : get from STREAMINFO metadata block
  • 001 : 8 bits per sample
  • 010 : 12 bits per sample
  • 011 : reserved
  • 100 : 16 bits per sample
  • 101 : 20 bits per sample
  • 110 : 24 bits per sample
  • 111 : 32 bits per sample
 3 Bits
0 "0(b)" Reserved: [1] Mandatory Value 0 1 Bit
F0 "11110000(b)" CRC-8 (polynomial = x^8 + x^2 + x^1 + x^0, initialized with 0) of everything before the crc, including the sync code 8 Bit
4EFF "0100111011111111(b)" CRC-16 (polynomial = x^16 + x^15 + x^2 + x^0, initialized with 0) of everything before the crc, back to and including the frame header sync code 16 Bit
Warm up Frames?

FF 89 81 FF 8E 74 FF 92 E9 FF 91 DF FF 95 46 FF 8E A2 FF 86 61 FF 7B 71 E6 9D E5

0 Stream Frame Sub-Header 2352

FF 7B 71 E6 9D E5

0 Stream Frame 2352
Value Hex Description Number Bits
FFF8 1111 1111 1111 10(b) FFF8 Sync code '11111111111110' 14 bits
0 "0(b)" Zero bit padding, to prevent sync-fooling string of 1s 1 Bit
0 "0(b)" Subframe type: 
   000000 : SUBFRAME_CONSTANT
   000001 : SUBFRAME_VERBATIM
   00001x : reserved
   0001xx : reserved
   001xxx : if(xxx <= 4) SUBFRAME_FIXED, xxx=order ; else reserved
   01xxxx : reserved
   1xxxxx : SUBFRAME_LPC, xxxxx=order-1
6 Bit
C 1100 "1100(b)" Block size in inter-channel samples:
  • 0000 : reserved
  • 0001 : 192 samples
  • 0010-0101 : 576 * (2^(n-2)) samples, i.e. 576/1152/2304/4608
  • 0110 : get 8 bit (blocksize-1) from end of header
  • 0111 : get 16 bit (blocksize-1) from end of header
  • 1000-1111 : 256 * (2^(n-8)) samples, i.e. 256/512/1024/2048/4096/8192/16384/32768
 4 Bits
3 0011 "0011(b)" Sample rate:
  • 0000 : get from STREAMINFO metadata block
  • 0001 : 88.2kHz
  • 0010 : 176.4kHz
  • 0011 : 192kHz
  • 0100 : 8kHz
  • 0101 : 16kHz
  • 0110 : 22.05kHz
  • 0111 : 24kHz
  • 1000 : 32kHz
  • 1001 : 44.1kHz
  • 1010 : 48kHz
  • 1011 : 96kHz
  • 1100 : get 8 bit sample rate (in kHz) from end of header
  • 1101 : get 16 bit sample rate (in Hz) from end of header
  • 1110 : get 16 bit sample rate (in tens of Hz) from end of header
  • 1111 : invalid, to prevent sync-fooling string of 1s
 4 Bits
8 1000 "1000(b)" Channel assignment
  1. 0000-0111 : (number of independent channels)-1. Where defined, the channel order follows SMPTE/ITU-R recommendations. The assignments are as follows:
    1. channel: mono
    2. channels: left, right
    3. channels: left, right, center
    4. channels: front left, front right, back left, back right
    5. channels: front left, front right, front center, back/surround left, back/surround right
    6. channels: front left, front right, front center, LFE, back/surround left, back/surround right
    7. channels: front left, front right, front center, LFE, back center, side left, side right
    8. channels: front left, front right, front center, LFE, back left, back right, side left, side right
  2. 1000 : left/side stereo: channel 0 is the left channel, channel 1 is the side(difference) channel
  3. 1001 : right/side stereo: channel 0 is the side(difference) channel, channel 1 is the right channel
  4. 1010 : mid/side stereo: channel 0 is the mid(average) channel, channel 1 is the side(difference) channel
  5. 1011-1111 : reserved
 4 Bits
C 110 "110(b)" Sample size in bits:
  • 000 : get from STREAMINFO metadata block
  • 001 : 8 bits per sample
  • 010 : 12 bits per sample
  • 011 : reserved
  • 100 : 16 bits per sample
  • 101 : 20 bits per sample
  • 110 : 24 bits per sample
  • 111 : 32 bits per sample
 3 Bits
0 "0(b)" Reserved: [1] Mandatory Value 0 1 Bit
00 "00000000(b)" CRC-8 (polynomial = x^8 + x^2 + x^1 + x^0, initialized with 0) of everything before the crc, including the sync code 8 Bit
F04E "1111000001001110(b)" CRC-16 (polynomial = x^16 + x^15 + x^2 + x^0, initialized with 0) of everything before the crc, back to and including the frame header sync code 16 Bit

Manual Configure FLAC in Eclipse

  1. cmake project in Eclipse manual confiure. Johnny (talk) 19:16, 6 August 2024 (UTC)
  2. Follow full directions and do CMake first to populate directories.
  3. When updating make command include -C ${ConfigName} om behavior page.
  4. Debugging now.
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