Cherry pick PR #2845: [media] Recreate codec to ensure new codec in P…

…artialAudio tests (#2907)

Refer to the original PR: #2845

AudioDecoder::Reset() may use flush() to reset codec, which could fail
in PartialAudio tests on tvos and android with aac, ec3, and ac3 inputs.
Recreating codec ensures the outputs are the same in the tests.

b/329526479

Co-authored-by: Bo-Rong Chen <[email protected]>

starboard/shared/starboard/player/filter/testing/audio_decoder_test.cc

@@ -336,14 +336,31 @@ class AudioDecoderTest
     }
   }
 
-  void ResetDecoder() {
-    audio_decoder_->Reset();
+  void ResetInternal() {
     can_accept_more_input_ = true;
     last_input_buffer_ = nullptr;
     decoded_audios_.clear();
+    written_inputs_.clear();
     eos_written_ = false;
     decoded_audio_sample_rate_ = 0;
     first_output_received_ = false;
+    {
+      ScopedLock scoped_lock(event_queue_mutex_);
+      event_queue_.clear();
+    }
+  }
+
+  void ResetDecoder() {
+    audio_decoder_->Reset();
+    ResetInternal();
+  }
+
+  void RecreateDecoder() {
+    // TODO(b/332955827): Investigate the output difference after flush() codec.
+    audio_decoder_.reset();
+    audio_renderer_sink_.reset();
+    ResetInternal();
+    SetUp();
   }
 
   void WaitForDecodedAudio() {
@@ -724,7 +741,7 @@ TEST_P(AudioDecoderTest, PartialAudio) {
        ++number_of_input_to_write) {
     SB_LOG(INFO) << "Testing " << number_of_input_to_write
                  << " access units for partial audio.";
-    ResetDecoder();
+    RecreateDecoder();
 
     // Decode InputBuffers without partial audio and use the output as reference
     for (int i = 0; i < number_of_input_to_write; ++i) {
@@ -766,7 +783,7 @@ TEST_P(AudioDecoderTest, PartialAudio) {
                                      decoded_audio_sample_rate_) /
         4;
 
-    ResetDecoder();
+    RecreateDecoder();
 
     for (int i = 0; i < number_of_input_to_write; ++i) {
       SbTime duration_to_discard_from_front = i == 0 ? duration_to_discard : 0;
@@ -817,12 +834,12 @@ TEST_P(AudioDecoderTest, PartialAudio) {
         (frames_per_access_unit / 4 - 1) * bytes_per_frame;
     auto reference_search_end = reference_decoded_audio->data() +
                                 reference_decoded_audio->size_in_bytes();
-    auto offset_in_bytes =
-        std::search(reference_search_begin, reference_search_end,
-                    partial_decoded_audio->data(),
-                    partial_decoded_audio->data() +
-                        partial_decoded_audio->size_in_bytes()) -
-        reference_search_begin;
+    auto offset_index = std::search(
+        reference_search_begin, reference_search_end,
+        partial_decoded_audio->data(),
+        partial_decoded_audio->data() + partial_decoded_audio->size_in_bytes());
+    ASSERT_FALSE(offset_index == reference_search_end);
+    auto offset_in_bytes = offset_index - reference_search_begin;
     auto offset_in_frames = offset_in_bytes / bytes_per_frame;
 
     constexpr int kEpsilonInFrames = 2;