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[asdcplib.git] / README

$Id$

The asdcplib library is a set of objects that offer
simplified access to files conforming to the sound and
picture track file formats proposed by the SMPTE working
group DC-28.20.

This work was originally funded by Digital Cinema
Initiatives, LLC. Subsequent efforts have been funded by
Deluxe Laboratories, Doremi Labs, and others.

**The asdcplib project is housed on SourceForge. The project
home page is at http://sourceforge.net/projects/asdcplib.
There is not much there other than CVS because I don't
really have the time to master SourceForge administration.
Feel free to email with questions or to request a tar file.

The project used to depend upon the mxflib project. Because
of the focus on covering the whole of the MXF spscifications,
mxflib is considerably larger and more complex that what I
require for this application. For this reason I have created
a dedicated MXF implementation that is now part of this
library. Special thanks to Matt Beard and Oliver Morgan for
their great work and support.

Thanks also to the members of the SMPTE DC-28.20 packaging
ad-hoc group and the members of the MXF Interop Initiative
for their encouragement and support. Special thanks to
Jim Whittlesey and Howard Lukk at DCI for proposing and
supporting this project.


Design Notes

This library is intended (but of course not limited) for
use by developers of commercial D-Cinema products.  It is
designed to be easily integrated into a wide variety of
development environments.  Commercial users are strongly
urged to use static linking (at least where you use this
library) to prevent malicious in-field replacement of
critical system modules. This recommendation should be
considered wherever Open Source or Free software is being
used for applications having non-trivial security
requirements.

The author strives mightily to provide an API that is
completely independent of operating system and other
library dependencies, and which allows selective replacement
of some modules for local needs.  Specifically, the essence
parsers and OpenSSL crypto functions can be replaced by
linking to alternative implementations of the ASDCP::
objects which provide those services.

AS_DCP.h contains the entire API.  You do not need to read
any of the other files, except maybe asdcp-test.cpp which
contains detailed usage examples of each of the API's
services.


Build Instructions

GNU make is required to build asdcplib. The makefile will
work on win32 systems that have Cygwin. Other win32 gmake
packages may or may not work depending upon the availability
of standard POSIX shell commands. You will need gcc to rebuild
the dep.make file.

OpenSSL is also required. See http://www.openssl.org

If you are building on win32 or a unix with no OpenSSL library
support, you will have to also obtain and build OpenSSL (I'm
using 0.9.7d on win32).  Unpack it into the same parent directory
as asdcplib/, and rename the directory as (or make a sym link
named) 'openssl':

myhost$ ls -l
total 1761
drwxr-xr-x    1 jhurst   None         0 Feb  3 16:37 asdcplib
drwxr-xr-x   56 jhurst   None         0 Feb  2 16:35 openssl

I have tested this build on win32, Linux and Darwin platforms.
Others may work as well.


Build Versions

There are two flavors of build: the default build and the
"SMPTE_LABELS" build. Unless you are specifically  working on
emerging SMPTE standards for D-Cinema content, you will certainly
want the default build. If you are developing support for the MXF
Interop Initiative standards, the default build is for you!

If you are not aiming for MXF Interop and if you are working
on developing support for the very latest versions of the SMPTE
draft standards, then you want the SMPTE_LABELS build:

  make SMPTE_LABELS=1

NOTE: If you choose the SMPTE_LABELS build, you will be creating
files that may not work on MXF Interop systems. In the case of
encryption, incompatibility with MXF Interop is guaranteed! You
have been warned!


Documentation

Currently, the documentation is mostly in AS_DCP.h. Read
that file for a detailed description of the library's
capabilities.  Read asdcp-test.cpp for library usage
examples. More detailed documentation will be written RSN.


Change History
2006.03.09 - full read-write
 o Removed ASDCP_WITHOUT_OPENSSL compile-time option.
 o Full read/write now working on new MXF library

2005.00.00 - A New Hope
 o The temporary mxf-lite has been removed. MXF files are now 
   managed via the objects in KLV.h, MXFTypes.h MXF.h and
   Metadata.h. This release does not support writing MXF files.
 o Fixed a header interpretation error in the Wav parser.


2005.00.00 - The Reformation
 o Removed mxflib as a dependency by forking the necessary
   functions and placing them in the mxf-lite subdirectory.
   Please note that the very heavy modifications done here
   render all comparisson to mxflib code a substantial task.
   All errors are now mine and users are warned not to bug
   Oliver or Matt for help with this code. The version of
   mxflib at the time of the fork was: 0.5.1.3.


2005.06.03 - bug fixes v0.10.18
 o Updated UL batch to include GC UL.


2005.05.27 - bug fixes v0.10.17
 o Un-did essence container and compression descriptor changes.
   The default build reflects MXF Interop decisions as of 26 May.
 o Added note about build versions to README (see above).
 o Added warnings to SMPTE_LABELS builds.
 o Fixed JP2K essence container label.


2005.05.02 - bug fixes v0.10.16
 o Reorganized internal files, added file reader object, added OS
   portability header, removed and renamed some files. If you have a
   patch against previous versions of the source, you should check
   it thoroughly.
 o Added RGBA attributes to JP2K descriptor.
 o Changed interface to CodestreamParser.
 o Added JP2K parser implementation. It is parsing each frame but is
   not yet being used to populate the descriptor.
 o Added 48fps option for `asdcp-test -p`.
 o Added picture rate constants to AS_DCP.h (23.976, 24, 48).
 o Added sample rate constant to AS_DCP.h (48k).
 o Changed asdcp-test to encrypt picture headers by default
   (plaintext offset will be 0), added -E option to allow
   plaintext headers.


2005.04.28 - bug fixes v0.9.15
 o The XML descriptors for the crypto DMS have moved in mxflib to
   the file DMS_Crypto.xml (they were in DMS_DCPENC.xml).  Older
   installations should update the file from mxflib.
 o Added Close() and Seek() to ~MyFileWriter(), cleaned up headers
 o Added UUID generator output mode (-u).
 o Added -S option to extract PCM essence into stereo wav files
 o Added more UL testing and conformance checking.
 o Added macro SMPTE_LABELS which causes the library to be built
   with SMPTE (as opposed to MXF Interop) labels. This is not
   set by default, and currently only affects the PCM container
   label and encrypted element label.
 o Cleaned up the GNUmakefile test targets, the source files
   are now named with the TEST_FILE_PREFIX macro.
 o enabled 23.976-framed PCM (2002 samples per frame)
 o The size of the asdcp-test frame buffer for picture essence
   may now be set from the command line (-b).  The default is 4MB.
 o h__Reader::ReadEKLVPacket() now tests the UL (duh) and switches
   on the value, allowing plaintext and ciphertext frames to
   be mixed in the file.
 o Fixed error in UUID generator format.
 o JP2K files now use the GenericPictureDescriptor to store
   ContainerDuration and SampleRate. SampleRate is mapped
   to EditRate in the PictureDescriptor struct. This fixes
   the second caveat from the 0.8.13 release.
 o Fxed bug in PCMParserList that was miscalculating the extent
   of a PCM sample.  This bug did not affect API users, it was
   only present in asdcp-test.
 o Fixed EditRate on PCM files (was showing sample rate)
 o Fixed Encrypted Essence Container UL
 o Fixed BlockAlign value for PCM essence

 - The following changes were provided by Jeff Loewenguth
 - Thanks Jeff!
 o Moved the DMS CryptographicFramework entry from the material
   package to the source package
 o Fixed erroneous Source Essence Container Label value
 o Fixed broken sort of JP2K frames in JP2K parser
 o Added FindFrameGOPStart() method to the MPEG2 MXFReader
 o Added missing length values for EKLV packets without HMAC
 o -x with JP2K essence writes to files with 6 digit names
   (up from 5 digits).
 o The Key ID may now be specified as an argument to asdcp-test
    (-j <key-id-string>)


2004.12.30 - bug fixes + wav files v0.8.14
 o Added WAV file write to asdcp-test (uses mxflib::waveheader_t).
 o Three-partition files reading properly.  adscplib still writes
   two-partition files.
 o Changes in the mxflib WAV essence parser API had broken
   asdcplib's ability to read essence from a WAV file.  I have
   fixed this bug, but at the expense of breaking compatibility
   with older versions of mxflib. Beware!
 o Removed redundant (but working) bin-text-bin conversions.


2004.12.23 - JPEG 2000 support v0.8.13
 o Reads/writes JPEG 2000 essence in plaintext and ciphertext
   with the following caveats:
    - The Picture Essence Descriptor is empty.
    - Because there is no essence descriptor, the reader code
      in asdcp-test has no idea how many frames are in the file
      and ends with an out-of-bounds frame error.  This error
      is being suppressed in asdcp-test for the current release.
 o Still broken when reading three-partition files.


2004.10.22 - fixes and UL updates v0.7.11
 WARNING: COMPATIBILITY BREAKPOINT
 Files created with this and future versions of this library are
 not compatible with previous versions of this library.  As you
 might suspect, files created with previous versions of this
 library are not compatible with  this and future versions.

 o h__Reader will now open a three-partitition file (untested)
 o Moved DMS from Material partition to File partition
 o Added length fields to appropriate places in EKLV packet 


2004.10.22 - fixes and UL updates v0.7.10
 o fixed frame buffer handling of externally allocated buffer,
   created unit test (asdcp-mem-test)
 o added operator==() and operator!=() to Rational type
 o fixed some type-related compiler warnings
 o asdcp-test -p now works on unwrap
 o updated some ULs to match documentation (thanks to Arun
   for the submission)
 o canonicalized line endings


2004.07.02 - full plaintext + ciphertext read/write v0.6.9
 o HMAC, plaintext offest and raw ciphertext read supported
 o back to proper CBR index
 o MPEG temporal offset working


2004.07.01 - plaintext + ciphertext read/write v0.5.8
 o encryption of MPEG and PCM essence supported with the
   following caveats:
   - no HMAC support
   - no plaintext offest support
   - no raw ciphertext read support
 o moved to reflecting the whole KLV triplet in the CBR
   index (now incompatible with mxflib, still searching
   for info about what's "right")
 o awaitng the following fixes/features:
   - retrieve Temporal Offset from index in MPEG2::Reader
   - test for correct ULs when reading frame triplets
   - fix header metadata items for encrypted files
   - HMAC support
   - plaintext offest support
   - raw ciphertext read support


2004.06.14 - plaintext read/write w/key generator v0.4.5
 o Project now uses OpenSSL (tested with 0.9.7d on win32, Linux, Darwin)
   Use `make ASDCP_WITHOUT_OPENSSL=1` to make plaintext-only version
 o Accepts interior I frames when parsing MPEG2 VES
 o Improved error reporting on format errors
 o Added support for encryption to asdcp-test
 o Added RNG for asdcp-test (non-production use only, see notes in FortunaRNG.h)
 o Implemented CBC encrypt, decrypt module
 o Added partial TemporalOffset retrieval from MPEG2 parser
 o Fixed win32 binmode bug


2004.05.12 - plaintext read/write v0.3.4
 o Full read/write of plaintext MPEG-2 VES and WAV files
   (does not yet support mux from or demux to 2 channel pairs)
 o Builds with autoconf-based mxflib
 o Added ASDCP_ prefix to macros
 o Updated documentation, fixed documentation errors
 o Simplified API for MXF writer setup
 o Decoupled essence parsers from MXF writers
 o added raw ciphertext support to FrameBuffer
 o Cleaned up Get/Set naming confusion
 o Added missing const qualifiers


2004.04.27 - preview release v0.2.1
 o hasty release for quick review
 o this release may not build with mxflib using autoconf.
 o writes plaintext AS-DCP MPEG2 essence files
 o tested under win32 and linux. FreeBSD and Darwin do not work


2004.02.04 - First release (v0.1.1):
 o asdcp-test is mostly complete. It should correctly provide
   access to the read and info capabilities of the library.
 o The MPEG2 reader is functional but not fully tested.
 o Some file format integrity tests remain to be coded.
 o The PCM reader is mostly complete, I am having difficulty
   getting a suitable test file from mxfwrap.
 o The makefile creates a static library module. The API
   will cleanly support a DSO (or DLL). Let me know if DSO
   support is important to you.
 o Nothing is thread safe. Thread safety was not a requirement
   in the initial project definition. Thread safety may be added
   above the mxflib/klvlib level. Let me know if it is important
   to you.
 o The files xmldict.xml and types.xml must be in the current
   directory when the program is run. The files are supplied
   with mxflib. Runtime location of the files is not currently
   a project goal. Comments on how best to handle this situation
   would be appreciated. See AS_DCP.cpp at init_mxf_types()
   for a more detailed discussion.

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