RFR: 8357714: AudioClip.play crash on macOS when loading resource from jar [v3]

[Johan Vos]

> After JDK-8287822 (https://bugs.openjdk.org/browse/JDK-8287822), mpeg file content is no longer played via GSTPlatform but via OSXPlatform. 
> We need to correctly handle data in case the source is a file inside a jar, in which case CJavaInputStreamCallbacks is used.
> 
> The 2 changes I made are:
> 1. Use ConnectionHolder instead of Locator for CJavaInputStreamCallbacks in case a jar resource is used.
> 2. In case of random access datasource, use readBlock instead of readNextBlock in AVMediaPlayer

Johan Vos has updated the pull request incrementally with one additional commit since the last revision:

  Remove whitespace

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1839/files
  - new: https://git.openjdk.org/jfx/pull/1839/files/e99a8504..15ce1ee6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1839&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1839&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1839.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1839/head:pull/1839

PR: https://git.openjdk.org/jfx/pull/1839