Added OTIO_CORE 0.14.0 version_manifest. (#1415)

* Added OTIO_CORE 0.14.0 version_manifest.
* Adding instructions for runtime downgrading to versioning-schemas.md
* Removed Test schema from 0.14.0 version manifest.

Signed-off-by: Joshua Minor <[email protected]>

Author: jminor

docs/tutorials/versioning-schemas.md

@@ -199,6 +199,35 @@ otio.adapters.write_to_file(
 
 See the [versioning module](../api/python/opentimelineio.versioning.rst) for more information on accessing these.
 
+## Downgrading at Runtime
+
+If you are using multiple pieces of software built with mismatched versions of OTIO, you may need to configure the newer one(s) to write out OTIO in an older format without recompiling or modifying the software.
+
+You can accomplish this in two ways:
+- The `OTIO_DEFAULT_TARGET_VERSION_FAMILY_LABEL` environment variable can specify a family and version.
+- The `otioconvert` utility program can downgrade an OTIO file to an older version.
+
+### OTIO_DEFAULT_TARGET_VERSION_FAMILY_LABEL Environment Variable
+
+If your software uses OTIO's Python adapter system, then you can set the `OTIO_DEFAULT_TARGET_VERSION_FAMILY_LABEL` environment variable with a `FAMILY:VERSION` value.
+For example, in a *nix shell: `env OTIO_DEFAULT_TARGET_VERSION_FAMILY_LABEL=OTIO_CORE:0.14.0 my_program`
+
+The `OTIO_CORE` family is pre-populated with the core OTIO schema versions for previous OTIO releases, for example `0.14.0`. If you have custom schema that needs to be downgraded as well, you will need to specify your own family and version mapping, as described above.
+
+### Downgrading with otioconvert
+
+If your software uses OTIO's C++ API, then it does not look for the `OTIO_DEFAULT_TARGET_VERSION_FAMILY_LABEL` environment variable, but you can convert an OTIO file after it has been created with the `otioconvert` utility.
+
+You can either use a family like this:
+```
+env OTIO_DEFAULT_TARGET_VERSION_FAMILY_LABEL=OTIO_CORE:0.14.0 otioconvert -i input.otio -o output.otio
+```
+
+or you can specify the version mapping for each schema you care about like this:
+```
+otioconvert -i input.otio -o output.otio -A target_schema_versions="{'Clip':1, 'Timeline':1, 'Marker':2}"
+```
+
 ## For Developers
 
 During the development of OpenTimelineIO schemas, whether they are in the core or in plugins, it is expected that schemas will change and evolve over time.  Here are some processes for doing that.

src/opentimelineio/CORE_VERSION_MAP.cpp

@@ -15,6 +15,38 @@
 namespace opentimelineio { namespace OPENTIMELINEIO_VERSION {
 
 const label_to_schema_version_map CORE_VERSION_MAP {
+    { "0.14.0",
+        {
+            { "Adapter", 1 },
+            { "Clip", 1 },
+            { "Composable", 1 },
+            { "Composition", 1 },
+            { "Effect", 1 },
+            { "ExternalReference", 1 },
+            { "FreezeFrame", 1 },
+            { "Gap", 1 },
+            { "GeneratorReference", 1 },
+            { "HookScript", 1 },
+            { "ImageSequenceReference", 1 },
+            { "Item", 1 },
+            { "LinearTimeWarp", 1 },
+            { "Marker", 2 },
+            { "MediaLinker", 1 },
+            { "MediaReference", 1 },
+            { "MissingReference", 1 },
+            { "PluginManifest", 1 },
+            { "SchemaDef", 1 },
+            { "SerializableCollection", 1 },
+            { "SerializableObject", 1 },
+            { "SerializableObjectWithMetadata", 1 },
+            { "Stack", 1 },
+            { "TimeEffect", 1 },
+            { "Timeline", 1 },
+            { "Track", 1 },
+            { "Transition", 1 },
+            { "UnknownSchema", 1 },
+        }
+    },
     { "0.15.0.dev1",
         {
             { "Adapter", 1 },

src/opentimelineio/CORE_VERSION_MAP.last.cpp

@@ -15,6 +15,38 @@
 namespace opentimelineio { namespace OPENTIMELINEIO_VERSION {
 
 const label_to_schema_version_map CORE_VERSION_MAP {
+    { "0.14.0",
+        {
+            { "Adapter", 1 },
+            { "Clip", 1 },
+            { "Composable", 1 },
+            { "Composition", 1 },
+            { "Effect", 1 },
+            { "ExternalReference", 1 },
+            { "FreezeFrame", 1 },
+            { "Gap", 1 },
+            { "GeneratorReference", 1 },
+            { "HookScript", 1 },
+            { "ImageSequenceReference", 1 },
+            { "Item", 1 },
+            { "LinearTimeWarp", 1 },
+            { "Marker", 2 },
+            { "MediaLinker", 1 },
+            { "MediaReference", 1 },
+            { "MissingReference", 1 },
+            { "PluginManifest", 1 },
+            { "SchemaDef", 1 },
+            { "SerializableCollection", 1 },
+            { "SerializableObject", 1 },
+            { "SerializableObjectWithMetadata", 1 },
+            { "Stack", 1 },
+            { "TimeEffect", 1 },
+            { "Timeline", 1 },
+            { "Track", 1 },
+            { "Transition", 1 },
+            { "UnknownSchema", 1 },
+        }
+    },
     // {next}
 };