ESP keeps rebooting with setIndex()

[alfons12]

Hello,

I run this example code with only two modifications:

const char *startFilePath="/003"; - I have a 003 folder under the root folder and 3 MP3s in it

and

player.setVolume(1); // 100
player.begin();
player.setAutoNext(false);
player.setIndex(1); // 2nd file

because I want to play just the second file.

It works fine without the setIndex() - it plays the first file in the 003 folder.

But the result with setIndex(1) is:

-----------------------------------------
load:0x40078000,len:16436
load:0x40080400,len:4
ho 8 tail 4 room 4
load:0x40080404,len:3524
entry 0x400805b8

assert failed: xStreamBufferSend stream_buffer.c:700 (pxStreamBuffer)

Backtrace: 0x40082571:0x3ffd1450 0x400947e5:0x3ffd1470 0x4009b46a:0x3ffd1490 0x40095b76:0x3ffd15c0 0x400d3c06:0x3ffd1600 0x400d3c8f:0x3ffd1630 0x400d8967:0x3ffd1660 0x400d5d0f:0x3ffd1690 0x400d3661:0x3ffd16c0 0x400d6ea0:0x3ffd1710 0x4020e57d:0x3ffd1730 0x400d401f:0x3ffd1750 0x400d50e9:0x3ffd1780 0x400d9876:0x3ffd17b0 0x400d9b8b:0x3ffd17e0 0x400d9eb1:0x3ffd1820 0x400d9f3a:0x3ffd1850 0x400da346:0x3ffd1880 0x400e83b7:0x3ffd1920 0x40095eba:0x3ffd1940

ELF file SHA256: 2811b231f

Rebooting...
ets Jul 29 2019 12:21:46

-----------------------------------------

Thank you for any hint.

[pschatzmann]

I don't think this is crashing in any my functionality: decode the backtrace to analyze where the issue is coming from..

If you want to play an individual file, maybe it is easier just to copy the file to the decoder.

[alfons12]

Ok, thanks. Is there an example somewhere how to do that? I started to use the library yesterday so would appreciate some guidance code before I get familiar with it.

[pschatzmann]

Google is your friend!

[alfons12]

I meant example of " it is easier just to copy the file to the decoder."

But thanks for the decoding backtrace as well :)

[pschatzmann]

That should be easy to find: just consider the naming conventions...

[alfons12]

If anybody would be able to identify the cause from the backtrace:

[pschatzmann]

I guess you just run out of RAM!
Did you try to activate PSRAM or decrease the A2DP buffer size ?

[alfons12]

Even though the playback without selecting the specific file works?

Activating PSRAM didn't solve it. Btw. I'm using the "Huge app" partition schema.

I also played with the buffer size but no luck - used this example https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-communication/a2dp/basic-player-a2dp/basic-player-a2dp.ino and commented out the audio kit stuff. This way I wasn't able to play anything :( - using this code the ESP32 reboots itself even without using setPath() or setIndex().

[alfons12]

I get the same error when using setPath() too.

Changed the wires, double-checked the pins, used different SD card and different SD card reader. Nothing helped.

Could you please point me out how to play an individual file without using setIndex() and setPath()?

Thank you very much for any hint.

[pschatzmann]

Maybe you should cosider this advice instead of moving from one complex case to another w/o any proper testing.

[alfons12]

No complex case here really. Just trying to run the basic a2dp example provided.

No additional code that would eat up RAM. 520KB in esp32 should be enough to run the example, right?

Wanted to avoid digging into the internal workings of the library since I just need to play the file (which works great without using the setPath()) but will probably have to spend a couple of days on it as now I'm stuck. Maybe different ESP32...

Anyways, thank you very much for your time and hints you provided.

[pschatzmann]

Try to monitor the RAM consumption for your specific case. I guess you just have an mp3 file with a bitrate that is consuming too much RAM.

Did you measure the RAM consumption of the MP3 decoding for your selected file only with a CSVOutput ?
Did you measure the RAM consumption of A2DP sending of a simple sine ?

You can avoid the excessive RAM allocation e.g. If you use WAV files instead or optimize the RAM allocations of the MP3 decoder and A2DP.

Audio on Microcontrollers is chanllenging because of the limited resources.
Both A2DP & mp3 decoding are specially challenging individually and when you want to combine them you need to know what you are doing!

Some users had issues with excessive metadata in the mp3.

Another variable is the ESP32 core version, the newer the less RAM you have available for your applications....

[alfons12]

Will try to dig deeper. Thank you. But could it really be a RAM problem if the MP3 is playing fine without the setPath/setIndex()? It simply plays nicely, no issues whatsoever. That would mean that setPath/setIndex() have some "RAM side effect"....?

It crashes even on a very small file with a normal bitrate:

I will also try a different type of ESP32.

[pschatzmann]

Hmm, I would be surprised: Did you run a test with a different output class ?
You can check the available RAM before and after the setPath call.

You could also try to use the SD or SDMMC library instead of SDFAT. I am not sure about the memory implications...

Your initial stacktrace and the log above are clear indications that there is not enought RAM and an allocation is failing.

[alfons12]

... Tried I2S stream, same result

... Can't check the RAM, need to first learn how to measure it. But this will definitely give answers.

... SD and SDMMC libraries apparently require different pins. It is impossible to guess the order from the documentation. Could you please clarify? Thank you.

[pschatzmann]

I just tried this sketch with an AudioKit using ESP32 core 3.1.2, SDFAT library 2.3.0 and the latest versions of my libraries.
I uncommented the setPath() and could not reproduce any issues.

You can call the checkMemory(true) method of my AudioTools to report on the RAM or just call ESP.getFreeHeap().

You can also define your custom Pins for the SD library by defining your custom SPI pins with the SPI.begin() method !
Unfortunately, the SDFAT pins on a regular ESP32 can not be changed.

I also tried the same with an output to A2DPStream and the available RAM was between 29k and 37k after each copy step.

[alfons12]

Phil, have you or some of the users of your library ever successfully decoded an MP3 with your library using an ESP32 with 512KB of SRAM without PSRAM?

After conducting a series of tests, trying multiple SD cards, SD cards readers, SD libraries and two different boards (WROOM, C6), I am leaning towards the conclusion that it simply can't work with my setup. That I need a different microcontroller - with either more memory or one which supports PSRAM.

Or is there a more RAM efficient way of using your library? Something less comfortable to use but less resource hungry?

Thank you.

[pschatzmann]

The ESP32 (with its 512 KB SRAM) has more then enough RAM (even w/o PSRAM) and as I was writing above I could not reproduce your issue even with the challenging A2DP sketch on an AudioKit which has a regular ESP32 processor using the latest ESP32 core version!

And there is definitly much more RAM then needed if you use the I2S output.

• Maybe you can share the mp3 files that are causing your issues ?
• You never provided the information what ESP32 Arduino core version you are you using.
• Please share your result about your available RAM at the different points of processing: As I was writing above I was getting between 29k and 37k which is enough.

There are plenty of ways to optimize the RAM usage by adusting the relevant parameters of your different components: just read the documentation.

• E.g. libhelix or
• sdfat has many configuration options and
• as mentioned above you can define the A2DP buffer size.

But in any case you will need to do a proper root cause analysis

The most memory efficient way to use A2DP is to just provide the audio data via the callback method: with this there is no need for the memory intensitive queue and I already mentioned that WAV are not using any RAM at all because they don't need to be decoded. It's just about copying data from the source to the destination!

[alfons12]

Phil, thank you for spending your valuable time on my issue :-/ Greatly appreciated.

This is the source code:

Arduino, ESP32 core versions, clean installation (tried 3.1.2, 3.1.1)

First three getFreeHeap() calls:
282356
218016
218016

The last one is not executed as the code crashes on player.copy()
assert failed: void libhelix::MP3DecoderHelix::provideResult(MP3FrameInfo&) MP3DecoderHelix.h:155 (written == toWrite)
Backtrace: 0x40082561:0x3ffb1f30 0x4008daf9:0x3ffb1f50 0x40093d0e:0x3ffb1f70 0x400d34f7:0x3ffb20a0 0x400d7f90:0x3ffb20f0 0x4017b701:0x3ffb2110 0x400d3c4f:0x3ffb2130 0x400d5725:0x3ffb2160 0x400da9ce:0x3ffb2190 0x400dace3:0x3ffb21c0 0x400daefd:0x3ffb2200 0x4017b6ad:0x3ffb2230 0x400d7fc5:0x3ffb2250 0x400e8458:0x3ffb2270 0x4008e7a2:0x3ffb2290

Tried multiple mp3s from different sources, all 44.1, 16bit, stereo, no difference.
Everything works perfectly with WAV files.

Is there anything left from the root cause analysis to be investigated?

[alfons12]

Oh, my bad.

1/ Streaming WAV to A2DP works fine.

2/ Streaming MP3 to I2S works fine.

• ESP.getFreeHeap() after player.copy() is 179156

3/ Streaming MP3 to A2DP doesn't work
(the numbers are ESP.getFreeHeap())

195768
131428
[W] A2DPStream.h : 338 - ==> state: Connecting
[W] A2DPStream.h : 338 - ==> state: Connected
12832
12832
12832
12832
12832
12832
--> here it gets stuck, no output printed, ESP32 doesn't reboot (AudioToolsLogLevel::Warning)

With AudioToolsLogLevel::Debug (bold are ouputs of ESP.getFreeHeap())
[W] A2DPStream.h : 338 - ==> state: Connected
[I] A2DPStream.h : 172 - a2dp_source is connected...
12576
12576
[D] AudioPlayer.h : 363 - virtual size_t audio_tools::AudioPlayer::copy(size_t)
[D] StreamCopy.h : 105 - copy 1024 bytes
[D] StreamCopy.h : 248 - available: 1059386
[D] StreamCopy.h : 396 - write: 1024
[D] AudioEncoded.h : 188 - EncodedAudioOutput::write: 1024
[D] CodecMP3Helix.h : 108 - virtual size_t audio_tools::MP3DecoderHelix::write(const uint8_t*, size_t): 1024
[D] CodecMP3Helix.h : 133 - static void audio_tools::MP3DecoderHelix::infoCallback(MP3FrameInfo&, void*)
[I] AudioTypes.h : 130 - MP3DecoderHelix sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] AudioPlayer.h : 224 - virtual void audio_tools::AudioPlayer::setAudioInfo(audio_tools::AudioInfo)
[I] AudioPlayer.h : 225 - sample_rate: 44100
[I] AudioPlayer.h : 226 - bits_per_sample: 16
[I] AudioPlayer.h : 227 - channels: 2
[D] VolumeStream.h : 166 - virtual void audio_tools::VolumeStream::setAudioInfo(audio_tools::AudioInfo)
[D] BaseStream.h : 122 - virtual void audio_tools::AudioStream::setAudioInfo(audio_tools::AudioInfo)
[I] AudioTypes.h : 130 - out: sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] BaseStream.h : 122 - virtual void audio_tools::AudioStream::setAudioInfo(audio_tools::AudioInfo)
[I] AudioTypes.h : 130 - out: sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] VolumeStream.h : 145 - VolumeStream::write: 4608
[D] A2DPStream.h : 238 - virtual size_t audio_tools::A2DPStream::write(const uint8_t*, size_t): 4608
[D] BufferRTOS.h : 96 - int audio_tools::BufferRTOS::writeArray(const T*, int) [with T = unsigned char]: 4608
[D] A2DPStream.h : 265 - write 4608 -> 4608
[D] AudioEncoded.h : 200 - EncodedAudioOutput::write: 1024 -> 1024
[D] StreamCopy.h : 402 - write: 1024 -> 1024
[I] StreamCopy.h : 168 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
12576
12576
[D] AudioPlayer.h : 363 - virtual size_t audio_tools::AudioPlayer::copy(size_t)
[D] StreamCopy.h : 105 - copy 1024 bytes
[D] StreamCopy.h : 248 - available: 1058362
[D] StreamCopy.h : 396 - write: 1024
[D] AudioEncoded.h : 188 - EncodedAudioOutput::write: 1024
[D] CodecMP3Helix.h : 108 - virtual size_t audio_tools::MP3DecoderHelix::write(const uint8_t*, size_t): 1024
[D] VolumeStream.h : 145 - VolumeStream::write: 4608
[D] A2DPStream.h : 238 - virtual size_t audio_tools::A2DPStream::write(const uint8_t*, size_t): 4608
[D] BufferRTOS.h : 96 - int audio_tools::BufferRTOS::writeArray(const T*, int) [with T = unsigned char]: 4608
[D] A2DPStream.h : 265 - write 4608 -> 4608
[D] AudioEncoded.h : 200 - EncodedAudioOutput::write: 1024 -> 1024
[D] StreamCopy.h : 402 - write: 1024 -> 1024
[I] StreamCopy.h : 168 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
12576
12576
[D] AudioPlayer.h : 363 - virtual size_t audio_tools::AudioPlayer::copy(size_t)
[D] StreamCopy.h : 105 - copy 1024 bytes
[D] StreamCopy.h : 248 - available: 1057338
[D] StreamCopy.h : 396 - write: 1024
[D] AudioEncoded.h : 188 - EncodedAudioOutput::write: 1024
[D] CodecMP3Helix.h : 108 - virtual size_t audio_tools::MP3DecoderHelix::write(const uint8_t*, size_t): 1024
[D] VolumeStream.h : 145 - VolumeStream::write: 4608
[D] A2DPStream.h : 238 - virtual size_t audio_tools::A2DPStream::write(const uint8_t*, size_t): 4608
[D] BufferRTOS.h : 96 - int audio_tools::BufferRTOS::writeArray(const T*, int) [with T = unsigned char]: 4608
[D] A2DPStream.h : 265 - write 4608 -> 4608
[D] VolumeStream.h : 145 - VolumeStream::write: 4608
[D] A2DPStream.h : 238 - virtual size_t audio_tools::A2DPStream::write(const uint8_t*, size_t): 4608
[D] A2DPStream.h : 253 - Waiting for buffer: writing 4608 > available 1536
[D] A2DPStream.h : 253 - Waiting for buffer: writing 4608 > available 1536
[D] A2DPStream.h : 253 - Waiting for buffer: writing 4608 > available 1536
[D] A2DPStream.h : 253 - Waiting for buffer: writing 4608 > available 1536

The "Waiting for buffer" then repeats ....

Here it seems to me that the it tries to allocate the buffer but it doesn't have enough memory?
It now behaves differently than before - at this point the ESP32 was rebooted automatically - the setup is the same, just took a different mp3 and upgraded ESP32 libraries to 3.1.3

[alfons12]

After setting cfg.buffer_size = 10240; it starts playing the mp3 but the quality is awful.

However,

player.begin();
player.setPath("aaa/example1000");

crashes immediately even with the modified buffer size.

[D] SDDirect.h : 172 - popPath: aaa
[D] SDDirect.h : 149 - FileT audio_tools::SDDirect<SDT, FileT>::openNext(FileT&) [with SDT = fs::SDFS; FileT = fs::File]
[D] SDDirect.h : 169 - void audio_tools::SDDirect<SDT, FileT>::popPath() [with SDT = fs::SDFS; FileT = fs::File]
[D] SDDirect.h : 172 - popPath:
[I] AudioSourceSD.h : 84 - Using file /aaa/example1000.mp3
[D] StreamCopy.h : 50 - void audio_tools::StreamCopyT::begin() [with T = unsigned char]
[I] StreamCopy.h : 54 - buffer_size=1024
[D] AudioPlayer.h : 276 - virtual bool audio_tools::AudioPlayer::setPath(const char*)
[I] AudioPlayer.h : 506 - void audio_tools::AudioPlayer::writeEnd()
[D] StreamCopy.h : 105 - copy 1024 bytes
[D] StreamCopy.h : 248 - available: 1059386
[D] StreamCopy.h : 396 - write: 1024
[D] AudioEncoded.h : 188 - EncodedAudioOutput::write: 1024
[D] CodecMP3Helix.h : 108 - virtual size_t audio_tools::MP3DecoderHelix::write(const uint8_t*, size_t): 1024
[D] CodecMP3Helix.h : 133 - static void audio_tools::MP3DecoderHelix::infoCallback(MP3FrameInfo&, void*)
[I] AudioTypes.h : 130 - MP3DecoderHelix sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] AudioPlayer.h : 224 - virtual void audio_tools::AudioPlayer::setAudioInfo(audio_tools::AudioInfo)
[I] AudioPlayer.h : 225 - sample_rate: 44100
[I] AudioPlayer.h : 226 - bits_per_sample: 16
[I] AudioPlayer.h : 227 - channels: 2
[D] VolumeStream.h : 166 - virtual void audio_tools::VolumeStream::setAudioInfo(audio_tools::AudioInfo)
[D] BaseStream.h : 122 - virtual void audio_tools::AudioStream::setAudioInfo(audio_tools::AudioInfo)
[I] AudioTypes.h : 130 - out: sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] BaseStream.h : 122 - virtual void audio_tools::AudioStream::setAudioInfo(audio_tools::AudioInfo)
[I] AudioTypes.h : 130 - out: sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] VolumeStream.h : 145 - VolumeStream::write: 4608
[I] Fade.h : 106 - faded out 1152 frames to volume 0.000000
[D] A2DPStream.h : 238 - virtual size_t audio_tools::A2DPStream::write(const uint8_t*, size_t): 4608
[D] BufferRTOS.h : 96 - int audio_tools::BufferRTOS::writeArray(const T*, int) [with T = unsigned char]: 4608

assert failed: xStreamBufferSend stream_buffer.c:700 (pxStreamBuffer)

Backtrace: 0x40082625:0x3ffd11a0 0x40095b21:0x3ffd11c0 0x4009c7a6:0x3ffd11e0 0x40096eb2:0x3ffd1310 0x400d3cca:0x3ffd1350 0x400d3e53:0x3ffd1380 0x400d881b:0x3ffd13b0 0x400d5ba3:0x3ffd13e0 0x400d35dd:0x3ffd1410 0x400d6bf0:0x3ffd1460 0x40213261:0x3ffd1480 0x400d405f:0x3ffd14a0 0x400d4f7d:0x3ffd14d0 0x400d9726:0x3ffd1500 0x400d9a3b:0x3ffd1530 0x400d9d65:0x3ffd1570 0x400d9dee:0x3ffd15a0 0x400da5b1:0x3ffd15d0 0x400e8a2f:0x3ffd1670 0x400971f6:0x3ffd1690

[pschatzmann]

I don't understand: why don't you provide the available RAM for this case ?
Again: please share the mp3 file that is crashing and the MP3 file that was working!

I am wondering why you only get 12k of available RAM when I was getting between 29k and 37k using the latest SDFAT library and the latest ESP32 core version.

You can still optimize the RAM usage of libhelix by defining:

• setMaxPCMSize(int size)
• setMaxFrameSize(int size)

I would expect that max pcm size should be 4608 and the min cfg.buffer_size 2 * 4608 for your case above

[alfons12]

Ok, here is the final result which brings me to the very beginning...

• No mp3 file works with SD library (only 13K of free RAM, no sound whatsoever, chunks of sound with cfg.buffer_size = 10240;)
• All files work with SDFAT library (free RAM between 37K and 45K)

However,

• everything work unless player.setPath() or setIndex() is used - I simply put any mp3 file in the root and let the library get it "automatically"
• 
• when either setPath or setIndex is used, ESP32 keeps rebooting
• there is no chance to measure free RAM as it crashes on setPath which occurs before any processing starts

So the RAM problem was caused by the SD library.

But what causes crash on setPath still remains a mystery :(

There is only a single 003.mp3 file in the root and I use setPath like this:

Result:

Free RAM before player.begin() 199452
Free RAM after player.begin() 167344
Then it crashes on setPath()

199452
[D] AudioPlayer.h : 147 - virtual bool audio_tools::AudioPlayer::begin(int, bool)
[I] AudioPlayer.h : 333 - setVolume(1.000000)
[D] Allocator.h : 68 - Allocated 8
[D] Allocator.h : 68 - Allocated 8
[I] VolumeStream.h : 199 - setVolume: 1.000000 at 0
[I] VolumeStream.h : 199 - setVolume: 1.000000 at 1
[D] BaseStream.h : 122 - virtual void audio_tools::AudioStream::setAudioInfo(audio_tools::AudioInfo)
[I] AudioTypes.h : 130 - out: sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] Allocator.h : 68 - Allocated 4
[D] Allocator.h : 68 - Allocated 8
[D] Allocator.h : 68 - Allocated 8
[D] AudioEncoded.h : 141 - virtual bool audio_tools::EncodedAudioOutput::begin()
[D] AudioEncoded.h : 143 - virtual bool audio_tools::EncodedAudioOutput::begin()
[D] AudioCodecsBase.h : 27 - virtual void audio_tools::AudioDecoder::setAudioInfo(audio_tools::AudioInfo)
[D] CodecMP3Helix.h : 79 - virtual bool audio_tools::MP3DecoderHelix::begin()
[D] AudioSourceSDFAT.h : 74 - virtual void audio_tools::AudioSourceSDFAT::begin()
[D] SDDirect.h : 27 - void audio_tools::SDDirect<SDT, FileT>::begin(const char*, const char*, const char*) [with SDT = SdFat32; FileT = File32]
[I] MetaDataID3.h : 567 - virtual void audio_tools::MetaDataID3::begin()
[D] VolumeStream.h : 101 - bool audio_tools::VolumeStream::begin(audio_tools::VolumeStreamConfig)
[I] AudioSourceSDFAT.h : 99 - selectStream SDFAT: 0
[D] SDDirect.h : 77 - listDir: /
[D] SDDirect.h : 239 - FileT audio_tools::SDDirect<SDT, FileT>::open(const char*) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 144 - isDirectory /: 1
[D] SDDirect.h : 144 - isDirectory /: 1
[D] SDDirect.h : 129 - void audio_tools::SDDirect<SDT, FileT>::rewind(FileT&) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 149 - FileT audio_tools::SDDirect<SDT, FileT>::openNext(FileT&) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 144 - isDirectory System Volume Information: 1
[D] SDDirect.h : 210 - -> fileNamePath: System Volume Information
[D] SDDirect.h : 223 - <- fileNamePath: /System Volume Information
[D] SDDirect.h : 102 - name: /System Volume Information
[D] SDDirect.h : 162 - void audio_tools::SDDirect<SDT, FileT>::pushPath(const char*) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 163 - pushPath: System Volume Information
[D] Allocator.h : 68 - Allocated 24
[D] SDDirect.h : 77 - listDir: /System Volume Information
[D] SDDirect.h : 239 - FileT audio_tools::SDDirect<SDT, FileT>::open(const char*) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 144 - isDirectory System Volume Information: 1
[D] SDDirect.h : 144 - isDirectory System Volume Information: 1
[D] SDDirect.h : 129 - void audio_tools::SDDirect<SDT, FileT>::rewind(FileT&) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 149 - FileT audio_tools::SDDirect<SDT, FileT>::openNext(FileT&) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 144 - isDirectory WPSettings.dat: 0
[D] SDDirect.h : 210 - -> fileNamePath: WPSettings.dat
[D] SDDirect.h : 223 - <- fileNamePath: /System Volume Information/WPSettings.dat
[D] SDDirect.h : 185 - -> isValidAudioFile: 'WPSettings.dat': 0
[D] SDDirect.h : 116 - Ignoring /System Volume Information/WPSettings.dat
[D] SDDirect.h : 149 - FileT audio_tools::SDDirect<SDT, FileT>::openNext(FileT&) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 144 - isDirectory IndexerVolumeGuid: 0
[D] SDDirect.h : 210 - -> fileNamePath: IndexerVolumeGuid
[D] SDDirect.h : 223 - <- fileNamePath: /System Volume Information/IndexerVolumeGuid
[D] SDDirect.h : 185 - -> isValidAudioFile: 'IndexerVolumeGuid': 0
[D] SDDirect.h : 116 - Ignoring /System Volume Information/IndexerVolumeGuid
[D] SDDirect.h : 149 - FileT audio_tools::SDDirect<SDT, FileT>::openNext(FileT&) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 153 - No next file
[D] SDDirect.h : 169 - void audio_tools::SDDirect<SDT, FileT>::popPath() [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 172 - popPath: System Volume Information
[D] SDDirect.h : 149 - FileT audio_tools::SDDirect<SDT, FileT>::openNext(FileT&) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 144 - isDirectory 003.mp3: 0
[D] SDDirect.h : 210 - -> fileNamePath: 003.mp3
[D] SDDirect.h : 223 - <- fileNamePath: /003.mp3
[D] SDDirect.h : 185 - -> isValidAudioFile: '003.mp3': 1
[D] SDDirect.h : 110 - File /003.mp3 at index: 0
[D] SDDirect.h : 149 - FileT audio_tools::SDDirect<SDT, FileT>::openNext(FileT&) [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 153 - No next file
[D] SDDirect.h : 169 - void audio_tools::SDDirect<SDT, FileT>::popPath() [with SDT = SdFat32; FileT = File32]
[D] SDDirect.h : 172 - popPath:
[I] AudioSourceSDFAT.h : 118 - -> selectStream: /003.mp3
[D] StreamCopy.h : 50 - void audio_tools::StreamCopyT::begin() [with T = unsigned char]
[I] StreamCopy.h : 54 - buffer_size=1024
[D] AudioPlayer.h : 276 - virtual bool audio_tools::AudioPlayer::setPath(const char*)
[I] AudioPlayer.h : 506 - void audio_tools::AudioPlayer::writeEnd()
[D] StreamCopy.h : 105 - copy 1024 bytes
[D] StreamCopy.h : 248 - available: 19688
[D] StreamCopy.h : 396 - write: 1024
[D] AudioEncoded.h : 188 - EncodedAudioOutput::write: 1024
[D] CodecMP3Helix.h : 108 - virtual size_t audio_tools::MP3DecoderHelix::write(const uint8_t*, size_t): 1024
[D] CodecMP3Helix.h : 133 - static void audio_tools::MP3DecoderHelix::infoCallback(MP3FrameInfo&, void*)
[I] AudioTypes.h : 130 - MP3DecoderHelix sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] AudioPlayer.h : 224 - virtual void audio_tools::AudioPlayer::setAudioInfo(audio_tools::AudioInfo)
[I] AudioPlayer.h : 225 - sample_rate: 44100
[I] AudioPlayer.h : 226 - bits_per_sample: 16
[I] AudioPlayer.h : 227 - channels: 2
[D] VolumeStream.h : 166 - virtual void audio_tools::VolumeStream::setAudioInfo(audio_tools::AudioInfo)
[D] BaseStream.h : 122 - virtual void audio_tools::AudioStream::setAudioInfo(audio_tools::AudioInfo)
[I] AudioTypes.h : 130 - out: sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] BaseStream.h : 122 - virtual void audio_tools::AudioStream::setAudioInfo(audio_tools::AudioInfo)
[I] AudioTypes.h : 130 - out: sample_rate: 44100 / channels: 2 / bits_per_sample: 16
[D] VolumeStream.h : 145 - VolumeStream::write: 4608
[I] Fade.h : 106 - faded out 1152 frames to volume 0.000000
[D] A2DPStream.h : 238 - virtual size_t audio_tools::A2DPStream::write(const uint8_t*, size_t): 4608
[D] BufferRTOS.h : 96 - int audio_tools::BufferRTOS::writeArray(const T*, int) [with T = unsigned char]: 4608

assert failed: xStreamBufferSend stream_buffer.c:700 (pxStreamBuffer)

[alfons12]

This migh (and might not) be a hint...

If I call setPath("/file01.mp3") before begin() - I know it will do nothing - it prints in the console:
[E] AudioSourceSDFAT.h : 115 - Open error: '/file01.mp3'

despite the file exists and is played correctly if setPath() is not used and the file is selected automatically.
[I] AudioSourceSDFAT.h : 118 - -> selectStream: /file01.mp3

[alfons12]

mp3btok.txt

I put together a working sketch that takes any file from the SD card and plays it using a BT speaker. It works nicely.

When I try to do the same with the same HW setup using player.setPath(), it fails.

I'm affraid I'm at the end of my investigation as I'm stuck and the working sketch does what I wanted to accomplish.

Thank you Phil for your time and if you could think of why the setPath is failing in my case, please let me know.