Temporary additional logging to investigate bug

The bug appears related to continuing to use an invalid buffer provider
in fast mixer after track destruction, so focus the added logs in that area.

Also includes a bug fix: was calling log in an unsafe place
near Threads.cpp AudioFlinger::PlaybackThread::createTrack_l line 1250.

Details:
 - include caller pid or client pid where appropriate
 - increase log buffer size
 - log mFastIndex when AudioMixer sees an invalid bufferProvider.
 - log both potentially modified and actually modified tracks in FastMixer.
 - fix benign bug where sq->end() was called more than once.
 - log StateQueue push() call and return.

Bug: 6490974
Change-Id: Iee7c8f40e20b6000cd8286c0ec6a14fff4a37af1

1 files changed, 28 insertions, 2 deletions

diff --git a/services/audioflinger/FastMixer.cpp b/services/audioflinger/FastMixer.cpp
index 80e37ca..b64c8fb 100644
--- a/services/audioflinger/FastMixer.cpp
+++ b/services/audioflinger/FastMixer.cpp
@@ -120,6 +120,7 @@ bool FastMixer::threadLoop()
         FastMixerState::Command command = next->mCommand;
         if (next != current) {
 
+            logWriter->logTimestamp();
             logWriter->log("next != current");
 
             // As soon as possible of learning of a new dump area, start using it
@@ -301,12 +302,19 @@ bool FastMixer::threadLoop()
                     const FastTrack* fastTrack = &current->mFastTracks[i];
                     AudioBufferProvider *bufferProvider = fastTrack->mBufferProvider;
                     ALOG_ASSERT(bufferProvider != NULL && fastTrackNames[i] == -1);
+                    if (bufferProvider == NULL ||
+                            bufferProvider->getValid() != AudioBufferProvider::kValid) {
+                        logWriter->logTimestamp();
+                        logWriter->logf("added invalid %#x", i);
+                    }
                     if (mixer != NULL) {
                         // calling getTrackName with default channel mask and a random invalid
                         //   sessionId (no effects here)
                         name = mixer->getTrackName(AUDIO_CHANNEL_OUT_STEREO, -555);
                         ALOG_ASSERT(name >= 0);
                         fastTrackNames[i] = name;
+                        mixer->setParameter(name, AudioMixer::TRACK, AudioMixer::FAST_INDEX,
+                                (void *) i);
                         mixer->setBufferProvider(name, bufferProvider);
                         mixer->setParameter(name, AudioMixer::TRACK, AudioMixer::MAIN_BUFFER,
                                 (void *) mixBuffer);
@@ -322,22 +330,31 @@ bool FastMixer::threadLoop()
                     generations[i] = fastTrack->mGeneration;
                 }
 
-                // finally process modified tracks; these use the same slot
+                // finally process (potentially) modified tracks; these use the same slot
                 // but may have a different buffer provider or volume provider
                 unsigned modifiedTracks = currentTrackMask & previousTrackMask;
                 if (modifiedTracks) {
-                    logWriter->logf("modified %#x", modifiedTracks);
+                    logWriter->logf("pot. mod. %#x", modifiedTracks);
                 }
+                unsigned actuallyModifiedTracks = 0;
                 while (modifiedTracks != 0) {
                     i = __builtin_ctz(modifiedTracks);
                     modifiedTracks &= ~(1 << i);
                     const FastTrack* fastTrack = &current->mFastTracks[i];
                     if (fastTrack->mGeneration != generations[i]) {
+                        actuallyModifiedTracks |= 1 << i;
                         AudioBufferProvider *bufferProvider = fastTrack->mBufferProvider;
                         ALOG_ASSERT(bufferProvider != NULL);
+                        if (bufferProvider == NULL ||
+                                bufferProvider->getValid() != AudioBufferProvider::kValid) {
+                            logWriter->logTimestamp();
+                            logWriter->logf("modified invalid %#x", i);
+                        }
                         if (mixer != NULL) {
                             name = fastTrackNames[i];
                             ALOG_ASSERT(name >= 0);
+                            mixer->setParameter(name, AudioMixer::TRACK, AudioMixer::FAST_INDEX,
+                                    (void *) i);
                             mixer->setBufferProvider(name, bufferProvider);
                             if (fastTrack->mVolumeProvider == NULL) {
                                 mixer->setParameter(name, AudioMixer::VOLUME, AudioMixer::VOLUME0,
@@ -360,6 +377,9 @@ bool FastMixer::threadLoop()
                         generations[i] = fastTrack->mGeneration;
                     }
                 }
+                if (actuallyModifiedTracks) {
+                    logWriter->logf("act. mod. %#x", actuallyModifiedTracks);
+                }
 
                 fastTracksGen = current->mFastTracksGen;
 
@@ -423,6 +443,12 @@ bool FastMixer::threadLoop()
                 }
                 ftDump->mUnderruns = underruns;
                 ftDump->mFramesReady = framesReady;
+                AudioBufferProvider *bufferProvider = fastTrack->mBufferProvider;
+                if (bufferProvider == NULL ||
+                        bufferProvider->getValid() != AudioBufferProvider::kValid) {
+                    logWriter->logTimestamp();
+                    logWriter->logf("mixing invalid %#x", i);
+                }
             }
 
             int64_t pts;