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.
 - increase StateQueue size from 4 to 8 entries
 - log mixer->enable(), bufferProvider, and currentTrackMask
 - log buffer provider addresses
 - increase fast mixer log buffer again
 - check logf format vs. argument list compatibility
 - add logging to AudioMixer
 - add checking of magic field in AudioMixer to detect overwrites
 - add bool AudioMixer::enabled()

Bug: 6490974
Change-Id: I1f3f18aa62d9fbd35bc32285b669f5ba40efe28e

1 files changed, 43 insertions, 3 deletions

diff --git a/services/audioflinger/AudioMixer.cpp b/services/audioflinger/AudioMixer.cpp
index 08325ad..529d1b5 100644
--- a/services/audioflinger/AudioMixer.cpp
+++ b/services/audioflinger/AudioMixer.cpp
@@ -98,7 +98,7 @@ effect_descriptor_t AudioMixer::dwnmFxDesc;
 
 AudioMixer::AudioMixer(size_t frameCount, uint32_t sampleRate, uint32_t maxNumTracks)
     :   mTrackNames(0), mConfiguredNames((maxNumTracks >= 32 ? 0 : 1 << maxNumTracks) - 1),
-        mSampleRate(sampleRate)
+        mSampleRate(sampleRate), mLog(&mDummyLog)
 {
     // AudioMixer is not yet capable of multi-channel beyond stereo
     COMPILE_TIME_ASSERT_FUNCTION_SCOPE(2 == MAX_NUM_CHANNELS);
@@ -122,6 +122,7 @@ AudioMixer::AudioMixer(size_t frameCount, uint32_t sampleRate, uint32_t maxNumTr
     mState.hook         = process__nop;
     mState.outputTemp   = NULL;
     mState.resampleTemp = NULL;
+    mState.mLog         = &mDummyLog;
     // mState.reserved
 
     // FIXME Most of the following initialization is probably redundant since
@@ -131,6 +132,7 @@ AudioMixer::AudioMixer(size_t frameCount, uint32_t sampleRate, uint32_t maxNumTr
     for (unsigned i=0 ; i < MAX_NUM_TRACKS ; i++) {
         t->resampler = NULL;
         t->downmixerBufferProvider = NULL;
+        t->magic = track_t::kMagic;
         t++;
     }
 
@@ -169,6 +171,12 @@ AudioMixer::~AudioMixer()
     delete [] mState.resampleTemp;
 }
 
+void AudioMixer::setLog(NBLog::Writer *log)
+{
+    mLog = log;
+    mState.mLog = log;
+}
+
 int AudioMixer::getTrackName(audio_channel_mask_t channelMask, int sessionId)
 {
     uint32_t names = (~mTrackNames) & mConfiguredNames;
@@ -209,9 +217,12 @@ int AudioMixer::getTrackName(audio_channel_mask_t channelMask, int sessionId)
         t->mainBuffer = NULL;
         t->auxBuffer = NULL;
         t->downmixerBufferProvider = NULL;
+        t->fastIndex = -1;
+        // t->magic unchanged
 
         status_t status = initTrackDownmix(&mState.tracks[n], n, channelMask);
         if (status == OK) {
+            mLog->logf("getTrackName %d", n);
             return TRACK0 + n;
         }
         ALOGE("AudioMixer::getTrackName(0x%x) failed, error preparing track for downmix",
@@ -366,9 +377,11 @@ void AudioMixer::deleteTrackName(int name)
 {
     ALOGV("AudioMixer::deleteTrackName(%d)", name);
     name -= TRACK0;
+    mLog->logf("deleteTrackName %d", name);
     ALOG_ASSERT(uint32_t(name) < MAX_NUM_TRACKS, "bad track name %d", name);
     ALOGV("deleteTrackName(%d)", name);
     track_t& track(mState.tracks[ name ]);
+    track.checkMagic();
     if (track.enabled) {
         track.enabled = false;
         invalidateState(1<<name);
@@ -387,8 +400,10 @@ void AudioMixer::enable(int name)
     name -= TRACK0;
     ALOG_ASSERT(uint32_t(name) < MAX_NUM_TRACKS, "bad track name %d", name);
     track_t& track = mState.tracks[name];
+    track.checkMagic();
 
     if (!track.enabled) {
+        mLog->logf("enable %d", name);
         track.enabled = true;
         ALOGV("enable(%d)", name);
         invalidateState(1 << name);
@@ -400,19 +415,32 @@ void AudioMixer::disable(int name)
     name -= TRACK0;
     ALOG_ASSERT(uint32_t(name) < MAX_NUM_TRACKS, "bad track name %d", name);
     track_t& track = mState.tracks[name];
+    track.checkMagic();
 
     if (track.enabled) {
+        mLog->logf("disable %d", name);
         track.enabled = false;
         ALOGV("disable(%d)", name);
         invalidateState(1 << name);
     }
 }
 
+bool AudioMixer::enabled(int name)
+{
+    name -= TRACK0;
+    ALOG_ASSERT(uint32_t(name) < MAX_NUM_TRACKS, "bad track name %d", name);
+    track_t& track = mState.tracks[name];
+    track.checkMagic();
+
+    return track.enabled;
+}
+
 void AudioMixer::setParameter(int name, int target, int param, void *value)
 {
     name -= TRACK0;
     ALOG_ASSERT(uint32_t(name) < MAX_NUM_TRACKS, "bad track name %d", name);
     track_t& track = mState.tracks[name];
+    track.checkMagic();
 
     int valueInt = (int)value;
     int32_t *valueBuf = (int32_t *)value;
@@ -455,6 +483,9 @@ void AudioMixer::setParameter(int name, int target, int param, void *value)
         //         for a specific track? or per mixer?
         /* case DOWNMIX_TYPE:
             break          */
+        case FAST_INDEX:
+            track.fastIndex = valueInt;
+            break;
         default:
             LOG_FATAL("bad param");
         }
@@ -540,6 +571,7 @@ void AudioMixer::setParameter(int name, int target, int param, void *value)
 
 bool AudioMixer::track_t::setResampler(uint32_t value, uint32_t devSampleRate)
 {
+    checkMagic();
     if (value != devSampleRate || resampler != NULL) {
         if (sampleRate != value) {
             sampleRate = value;
@@ -572,6 +604,7 @@ bool AudioMixer::track_t::setResampler(uint32_t value, uint32_t devSampleRate)
 inline
 void AudioMixer::track_t::adjustVolumeRamp(bool aux)
 {
+    checkMagic();
     for (uint32_t i=0 ; i<MAX_NUM_CHANNELS ; i++) {
         if (((volumeInc[i]>0) && (((prevVolume[i]+volumeInc[i])>>16) >= volume[i])) ||
             ((volumeInc[i]<0) && (((prevVolume[i]+volumeInc[i])>>16) <= volume[i]))) {
@@ -600,8 +633,10 @@ size_t AudioMixer::getUnreleasedFrames(int name) const
 void AudioMixer::setBufferProvider(int name, AudioBufferProvider* bufferProvider)
 {
     name -= TRACK0;
+    mLog->logf("bp %d-%p", name, bufferProvider);
     ALOG_ASSERT(uint32_t(name) < MAX_NUM_TRACKS, "bad track name %d", name);
 
+    mState.tracks[name].checkMagic();
     if (mState.tracks[name].downmixerBufferProvider != NULL) {
         // update required?
         if (mState.tracks[name].downmixerBufferProvider->mTrackBufferProvider != bufferProvider) {
@@ -623,6 +658,9 @@ void AudioMixer::setBufferProvider(int name, AudioBufferProvider* bufferProvider
 
 void AudioMixer::process(int64_t pts)
 {
+    if (mState.needsChanged) {
+        mLog->logf("process needs=%#x", mState.needsChanged);
+    }
     mState.hook(&mState, pts);
 }
 
@@ -647,6 +685,7 @@ void AudioMixer::process__validate(state_t* state, int64_t pts)
     }
     state->enabledTracks &= ~disabled;
     state->enabledTracks |=  enabled;
+    state->mLog->logf("process_validate ena=%#x", state->enabledTracks);
 
     // compute everything we need...
     int countActiveTracks = 0;
@@ -1103,6 +1142,7 @@ void AudioMixer::process__genericNoResampling(state_t* state, int64_t pts)
 
     // acquire each track's buffer
     uint32_t enabledTracks = state->enabledTracks;
+    state->mLog->logf("process_gNR ena=%#x", enabledTracks);
     uint32_t e0 = enabledTracks;
     while (e0) {
         const int i = 31 - __builtin_clz(e0);
@@ -1111,8 +1151,8 @@ void AudioMixer::process__genericNoResampling(state_t* state, int64_t pts)
         t.buffer.frameCount = state->frameCount;
         int valid = t.bufferProvider->getValid();
         if (valid != AudioBufferProvider::kValid) {
-            ALOGE("invalid bufferProvider=%p name=%d frameCount=%d valid=%#x enabledTracks=%#x",
-                    t.bufferProvider, i, t.buffer.frameCount, valid, enabledTracks);
+            ALOGE("invalid bufferProvider=%p name=%d fastIndex=%d frameCount=%d valid=%#x enabledTracks=%#x",
+                    t.bufferProvider, i, t.fastIndex, t.buffer.frameCount, valid, enabledTracks);
             // expect to crash
         }
         t.bufferProvider->getNextBuffer(&t.buffer, pts);