Implement audio decoding supports to MediaSamplesDecoder - #77281

ffc83d5

Implement audio decoding supports to MediaSamplesDecoder
https://bugs.webkit.org/show_bug.cgi?id=327758
rdar://190173646

Reviewed by NOBODY (OOPS!).

MediaSamplesDecoder was a skeleton whose methods were placeholders. It now
decodes audio in the content process by wrapping AudioDecoder, for every codec
AudioDecoder accepts: Opus, Vorbis, FLAC, MP3, AAC (LC, HE, HE v2), A-law,
u-law and PCM. The decoded output is one MediaSamplesBlock of interleaved
32-bit float samples per call, backed by shared memory when UseSharedMemory is
set. The AAC cookie of a track built from a format description is an
ES_Descriptor, which is unwrapped to the AudioSpecificConfig AudioDecoder
expects. Encrypted tracks, and blocks holding encrypted samples, are rejected.
Only Cocoa is supported for now; other platforms and video report that they
cannot decode.

MediaSamplesBlock gains isolatedCopy() as NativePromise copies its resolve
value across threads.

* Source/WebCore/platform/MediaSamplesBlock.h:
(WebCore::MediaSamplesBlock::isolatedCopy):
* Source/WebCore/platform/MediaSamplesDecoder.cpp:
(WebCore::nextDescriptor): Added.
(WebCore::audioSpecificConfigFromESDescriptor): Added.
(WebCore::audioDecoderConfiguration): Added.
(WebCore::MediaSamplesDecoder::MediaSamplesDecoder):
(WebCore::MediaSamplesDecoder::~MediaSamplesDecoder):
(WebCore::MediaSamplesDecoder::canDecode):
(WebCore::MediaSamplesDecoder::create):
(WebCore::MediaSamplesDecoder::canContinueWith):
(WebCore::MediaSamplesDecoder::decode):
(WebCore::MediaSamplesDecoder::drain):
(WebCore::MediaSamplesDecoder::flush):
(WebCore::MediaSamplesDecoder::decodeOnQueue): Added.
(WebCore::MediaSamplesDecoder::drainOnQueue): Added.
(WebCore::MediaSamplesDecoder::flushOnQueue): Added.
(WebCore::MediaSamplesDecoder::finishFlush): Added.
(WebCore::MediaSamplesDecoder::settleWithPendingOutput): Added.
(WebCore::MediaSamplesDecoder::setAudioDecoder): Added.
(WebCore::MediaSamplesDecoder::didFailDecoding): Added.
(WebCore::MediaSamplesDecoder::didDecodeAudio): Added.
* Source/WebCore/platform/MediaSamplesDecoder.h:
* Tools/TestWebKitAPI/PlatformCocoa.cmake:
* Tools/TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* Tools/TestWebKitAPI/Tests/WebCore/cocoa/MediaSamplesDecoderTests.mm: Added.

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