If one removes the check for STATE_DRAINED from MediaCodecLoop, then this happens:


C   18.072s Main  ********************************************************************************
C   18.072s Main  Detailed Logs
C   18.072s Main  ********************************************************************************
C   18.072s Main  [UNKNOWN] MediaCodecAudioDecoderTest/AudioDecoderTest.ProduceAudioSamples/0:
C   18.073s Main  [ RUN      ] MediaCodecAudioDecoderTest/AudioDecoderTest.ProduceAudioSamples/0
C   18.073s Main  ../../media/filters/audio_decoder_unittest.cc:339: Failure
C   18.073s Main  Value of: buffer->timestamp().InMicroseconds()
C   18.073s Main    Actual: 80500
C   18.073s Main  Expected: sample_info.timestamp
C   18.073s Main  Which is: 500
C   18.073s Main  Google Test trace:
C   18.073s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 0
C   18.073s Main  ../../media/filters/audio_decoder_unittest.cc:340: Failure
C   18.073s Main  Value of: buffer->duration().InMicroseconds()
C   18.074s Main    Actual: 10000
C   18.074s Main  Expected: sample_info.duration
C   18.074s Main  Which is: 3500
C   18.074s Main  Google Test trace:
C   18.074s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 0
C   18.074s Main  ../../media/filters/audio_decoder_unittest.cc:350: Failure
C   18.074s Main  Value of: audio_hash.IsEquivalent(sample_info.hash, 0.02)
C   18.074s Main    Actual: false
C   18.074s Main  Expected: true
C   18.075s Main  Audio hashes differ. Expected: -0.26,0.87,1.36,0.84,-0.30,-1.22, Actual: -0.54,0.02,-0.38,-0.15,-0.76,-0.45,
C   18.075s Main  Google Test trace:
C   18.075s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 0
C   18.075s Main  ../../media/filters/audio_decoder_unittest.cc:355: Failure
C   18.075s Main  Value of: GetDecodedAudioMD5(i)
C   18.075s Main    Actual: "86afe194049ec8efa802d779ec6aeda3"
C   18.075s Main  Expected: exact_hash
C   18.075s Main  Which is: "48ea9bb1bdbf85e04cfb2689aa372349"
C   18.075s Main  Google Test trace:
C   18.076s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 0
C   18.076s Main  ../../media/filters/audio_decoder_unittest.cc:339: Failure
C   18.076s Main  Value of: buffer->timestamp().InMicroseconds()
C   18.076s Main    Actual: 90500
C   18.076s Main  Expected: sample_info.timestamp
C   18.076s Main  Which is: 4000
C   18.076s Main  Google Test trace:
C   18.076s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 1
C   18.076s Main  ../../media/filters/audio_decoder_unittest.cc:350: Failure
C   18.076s Main  Value of: audio_hash.IsEquivalent(sample_info.hash, 0.02)
C   18.077s Main    Actual: false
C   18.077s Main  Expected: true
C   18.077s Main  Audio hashes differ. Expected: 0.09,0.23,0.21,0.03,-0.17,-0.24, Actual: -0.20,0.13,-0.06,-0.05,-0.43,-0.34,
C   18.077s Main  Google Test trace:
C   18.077s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 1
C   18.077s Main  ../../media/filters/audio_decoder_unittest.cc:355: Failure
C   18.077s Main  Value of: GetDecodedAudioMD5(i)
C   18.077s Main    Actual: "63f746c63ed19aaf6f55b818a74db3c8"
C   18.078s Main  Expected: exact_hash
C   18.078s Main  Which is: "150be2d114cdffcb2eb84ec3ff05ab1c"
C   18.078s Main  Google Test trace:
C   18.078s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 1
C   18.078s Main  ../../media/filters/audio_decoder_unittest.cc:339: Failure
C   18.078s Main  Value of: buffer->timestamp().InMicroseconds()
C   18.078s Main    Actual: 100500
C   18.078s Main  Expected: sample_info.timestamp
C   18.078s Main  Which is: 14000
C   18.079s Main  Google Test trace:
C   18.079s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 2
C   18.079s Main  ../../media/filters/audio_decoder_unittest.cc:350: Failure
C   18.079s Main  Value of: audio_hash.IsEquivalent(sample_info.hash, 0.02)
C   18.079s Main    Actual: false
C   18.079s Main  Expected: true
C   18.079s Main  Audio hashes differ. Expected: 0.10,0.24,0.23,0.04,-0.14,-0.23, Actual: 0.83,0.47,0.96,0.29,0.59,0.00,
C   18.079s Main  Google Test trace:
C   18.080s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 2
C   18.080s Main  ../../media/filters/audio_decoder_unittest.cc:355: Failure
C   18.080s Main  Value of: GetDecodedAudioMD5(i)
C   18.080s Main    Actual: "8c20f2cc6b1e048370bc8cf93a579909"
C   18.080s Main  Expected: exact_hash
C   18.080s Main  Which is: "a330b3b2e7e6d1f0dca474f5f070b2c7"
C   18.080s Main  Google Test trace:
C   18.080s Main  ../../media/filters/audio_decoder_unittest.cc:427: i = 1, j = 2
C   18.080s Main  [  FAILED  ] MediaCodecAudioDecoderTest/AudioDecoderTest.ProduceAudioSamples/0, where GetParam() = bear-opus.ogg (128 ms)
C   18.080s Main  [----------] 1 test from MediaCodecAudioDecoderTest/AudioDecoderTest (128 ms total)
C   18.081s Main  
C   18.081s Main  [----------] Global test environment tear-down
C   18.081s Main  [==========] 1 test from 1 test case ran. (129 ms total)
C   18.081s Main  [  PASSED  ] 0 tests.
C   18.081s Main  [  FAILED  ] 1 test, listed below:
C   18.081s Main  
C   18.081s Main   1 FAILED TEST

on closer inspection, the flushed version of the codec returns AGAIN many times, until it returns a decoded buffer with pts 0.08 (should have been 0).

unsure if this is a bug that's specific to the codec or not.