[wildseansy]

Follow-up to #1333, targeting feat/adts-codec-support.

Buffered ADTS writes can succeed even when the following flush fails. Report fflush and fclose errors, and count frame bytes only after a successful flush. Own the output file with a closing smart pointer so an early codec-drain failure also releases it when the backend is destroyed.

Document ADTS .aac concatenation, matching sample rates/channel configurations, and removal of incomplete trailing frames. Preserve the feature branch's enum ordering and per-frame flush behavior.

Validation:

• Android NDK 27.1 C++20 syntax check of the full AndroidEncoder.cpp translation unit for arm64/API 24, using React Native 0.87.0 JSI headers.
• Local isolated C++ fault-injection harness using the extracted ADTS backend and real ADTS header implementation, with mocked codec/I/O boundaries: reproduced ignored flush/close failures, incorrect byte counting after failed flush, and missing cleanup in the original; all 12 checks pass with this patch. Also checked normal writes, short writes, start failure cleanup, and closing exactly once. This harness is local and is not an Android device test.
• git diff --check passes.

[github-actions]

WPT non-regression comparison

PASS — no regressions · 0 improved section(s) · overall 3427 → 3427 (0)

Unchanged sections (28)

Spec section	Base pass	Head pass	Delta
Processing model	1	1	0
Other	56	56	0
AnalyserNode	138	138	0
AudioBuffer	140	140	0
AudioBufferSourceNode	220	220	0
AudioContext	58	58	0
AudioNode	261	261	0
AudioParam	680	680	0
BiquadFilterNode	275	275	0
ChannelMergerNode	30	30	0
ChannelSplitterNode	7	7	0
ConstantSourceNode	64	64	0
ConvolverNode	178	178	0
DelayNode	127	127	0
DestinationNode	0	0	0
DynamicsCompressorNode	4	4	0
GainNode	15	15	0
IIRFilterNode	87	87	0
MediaElementAudioSourceNode	0	0	0
MediaStreamAudioDestinationNode	1	1	0
MediaStreamAudioSourceNode	0	0	0
OfflineAudioContext	35	35	0
OscillatorNode	104	104	0
PannerNode	727	727	0
PeriodicWave	33	33	0
ScriptProcessorNode	0	0	0
StereoPannerNode	104	104	0
WaveShaperNode	82	82	0

_{Baseline: 8b7d3124ae4f8452d3c5dcebfb1bc800d4a3b8c0 · Candidate: b81e3a5ce15cad5b074046a6305e38c652dbd16e}

_{Workflow run · this comment is updated on every push.}

[mdydek]

thank you