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authorRalph Giles <giles@thaumas.net>2016-10-04 08:46:00 -0700
committerErik de Castro Lopo <erikd@mega-nerd.com>2016-10-05 03:30:21 +1100
commit52df9c61178d49215f6c4d2ebfa43e0df1a4fd85 (patch)
treedf05df35ce9e4af6563e5ca6991d2d9d0780c035
parent4bbd73a854f47eaf0f776c01d7cf6d0c21639e74 (diff)
downloadflac-52df9c61178d49215f6c4d2ebfa43e0df1a4fd85.tar.gz
Flac-in-mp4 draft v0.0.1.
Draft updates in response to feedback from Timothy B. Terriberry and Jean-Yves Avenard. Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
-rw-r--r--doc/isoflac.txt61
1 files changed, 30 insertions, 31 deletions
diff --git a/doc/isoflac.txt b/doc/isoflac.txt
index a74d0f9b..46a218d0 100644
--- a/doc/isoflac.txt
+++ b/doc/isoflac.txt
@@ -1,5 +1,5 @@
Encapsulation of FLAC in ISO Base Media File Format
-Version 0.0.0 (early draft)
+Version 0.0.1 (draft)
Table of Contents
1 Scope
@@ -19,7 +19,8 @@ Table of Contents
4.4 Basic Structure (informative)
4.4.1 Initial Movie
4.5 Example of Encapsulation (informative)
-5 Author's Address
+5 Acknowledgements
+6 Author's Address
1 Scope
@@ -71,8 +72,6 @@ Table of Contents
for any PCM sample, a timestamp exactly matching its sampling
timestamp is present in the media timeline.
- 3.4 native metadata
-
4 Design Rules of Encapsulation
@@ -119,8 +118,6 @@ Table of Contents
lapping is required. See section 'Random Access' for
further details.
- FLAC native metadata
-
4.3 Definition of a FLAC sample
4.3.1 Sample entry format
@@ -211,14 +208,25 @@ Table of Contents
unsigned int(8) MetadataBlockData[BlockLength];
}
- aligned(8) class FLACSpecificBox extends Box('dfLa'){
+ aligned(8) class FLACSpecificBox
+ (unsigned int32 MetadataBlocks) extends Box('dfLa'){
unsigned int(8) Version;
- unsigned int(8) MetadataBlocks;
for(i=0; i <= MetadataBlocks; i++){
FLACMetadataBlock();
}
}
+ + MetadataBlocks:
+
+ The number of FLAC[3] native metadata blocks to
+ follow. This value must be at least 1 as a native
+ METADATA_BLOCK_STREAMINFO structure is required to
+ decode FLAC audio data.
+
+ This value is not coded as the end of the
+ FLACMetadataBlock list can be intuited from the
+ LastMetadataBlockFlag (see below).
+
+ Version:
The Version field shall be set to 0.
@@ -228,14 +236,7 @@ Table of Contents
of those values, the reader shall not read the fields
after this within the FLACSpecificBox.
- + MetadataBlocks:
-
- The number of FLAC[3] native metadata blocks to
- follow. This value must be at least 1 as a native
- METADATA_BLOCK_STREAMINFO structure is required to
- decode FLAC audio data.
-
- These fields are followed by a sequence of FLAC[3]
+ The Version field is followed by a sequence of FLAC[3]
native-metadata block structures that fill the remainder
of the box length.
@@ -348,14 +349,6 @@ Table of Contents
track. The sample_is_non_sync_sample field for FLAC
samples shall be set to 0.
- 4.3.6.2 Pre-roll
-
- FLAC bitstreams do not require pre-roll or
- multi-sample synchronization. All samples
- independently decode directly to a complete set of
- valid samples. NeitherAudioRollRecoveryEntry nor AudioPreRollEntry
- shall be used.
-
4.4 Basic Structure (informative)
4.4.1 Initial Movie
@@ -422,11 +415,11 @@ Table of Contents
It is strongly recommended that the order of boxes should
follow the above structure. Boxes marked with an asterisk
- (*) may be present. For most boxes listed above, the
- definition is as is defined in ISO/IEC 14496-12 [1]. The
- additional boxes and the additional requirements,
- restrictions and recommendations to the other boxes are
- described in this specification.
+ (*) may or may not be present depending on context. For
+ most boxes listed above, the definition is as is defined
+ in ISO/IEC 14496-12 [1]. The additional boxes and the
+ additional requirements, restrictions and recommendations
+ to the other boxes are described in this specification.
4.5 Example of Encapsulation (informative)
[File]
@@ -658,5 +651,11 @@ Table of Contents
position = 678
size = 17001
-5 Authors' Address
- Monty Montgomery <monty@xiph.org>
+5 Acknowledgements
+
+ This spec draws heavily from the Opus-in-ISOBMFF specification
+ work done by Yusuke Nakamura <muken.the.vfrmaniac |at| gmail.com>
+
+6 Authors' Address
+
+ Monty Montgomery <cmontgomery@mozilla.com>