Problem playing tracks over bluetooth.

[mooballs]

If anyone could help I'd very grateful. This code used to work, Phil helped me with one issue (declaring the sample rate) and now it compiles ok and loads but whenever I try to play something over bluetooth it freaks out and reboots. I'm sure it's something stupid I'm doing but I can't work out what it is. I was using one of the multi-outputs to feed a VU meter.
Here's the code:

`#include "AudioTools.h"
#include "BluetoothA2DPSink.h"

#include "AudioLibs/AudioA2DP.h"
#include "AudioConfigLocal.h"

BluetoothA2DPSink a2dp_sink;
A2DPStream in; // had to copy a2dp in to out, then wrap out in volume and eq then use multioutput to get vol_info
MultiOutput out;
StreamCopy copier(out, in); //copying in to out
VolumePrint out1; //changed from vol.info
I2SStream out2; //changed from i2s
//A2DPStream in;
VolumeStream volume(out);
LinearVolumeControl(lvc); //this is for using the log pot

Equilizer3Bands eq(volume); //must wrap the stream up correctly
//StreamCopy copier(eq, i2s); // copy in to equilizer
ConfigEquilizer3Bands cfg_eq;

#define I2S_BUFFER_SIZE 1024 //default is 512
#define I2S_BUFFER_COUNT 6 //default is 6

int VolLevel = 0;

void writeDataStream(const uint8_t *data, uint32_t length) {
out1.write(data, length);
}

void read_data_stream(const uint8_t *data, uint32_t length) {
eq.write(data, length);
}

// Arduino Setup
void setup() {

Serial.begin(115200);

out.add(out1); //multi-outs
out.add(out2);

AudioLogger::instance().begin(Serial, AudioLogger::Warning); //tried setting to Warning from Info to aid audio quality

//i2s_out esp32 external DAC
auto config = out2.defaultConfig(TX_MODE);
config.pin_bck = 26;
config.pin_ws = 25;
config.pin_data = 23;
config.sample_rate = 44100; //changed from a2dp_sink.sample_rate();
config.channels = 2;
config.bits_per_sample = 16;
config.buffer_size = I2S_BUFFER_SIZE;
config.buffer_count = I2S_BUFFER_COUNT;
out2.begin(config);

cfg_eq = eq.defaultConfig();
cfg_eq.setAudioInfo(config); // use channels, bits_per_sample and sample_rate from kit

cfg_eq.gain_medium = 0.5;

eq.begin(cfg_eq);

// set initial volume
volume.begin(config); // we need to provide the bits_per_sample and channels
volume.setVolume(0.0);
volume.setVolumeControl(lvc); //for using log pot
// register callback
//a2dp_sink.set_pin_config(my_pin_config);
a2dp_sink.set_stream_reader(writeDataStream, false);
a2dp_sink.set_stream_reader(read_data_stream, false);

a2dp_sink.set_mono_downmix(true); //makes mono
Serial.print("starting a2dp...");
// Start Bluetooth Audio Receiver
a2dp_sink.set_auto_reconnect(true);
a2dp_sink.start("BT"); //bluetooth name
}

// Arduino loop
void loop() {
copier.copy();
}
`

And here's the decoded stack results with the relevant line from the library in bold:

0x40083a49: panic_abort at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/esp_system/panic.c line 408
0x40094ed1: esp_system_abort at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/esp_system/esp_system.c line 137
0x4009b25d: __assert_func at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/newlib/assert.c line 85
0x400d26d2: audio_tools::Vector ::operator at C:\Users\marky\OneDrive\Documents\Arduino\libraries\arduino-audio-tools-main\src/AudioBasic/Collections/Vector.h line 228
inline T &operator[](int index) {

0x400d33c8: audio_tools::VolumeOutput::write(unsigned char const*, unsigned int) at C:\Users\marky\OneDrive\Documents\Arduino\libraries\arduino-audio-tools-main\src/AudioTools/AudioOutput.h line 550
volumes_tmp[j] = 0;

0x400d2745: audio_tools::MultiOutput::write(unsigned char const*, unsigned int) at C:\Users\marky\OneDrive\Documents\Arduino\libraries\arduino-audio-tools-main\src/AudioTools/AudioIO.h line 165
int written = vector[j]->write(buffer + start, open);

0x400d42d7: audio_tools::VolumeStream::write(unsigned char const*, unsigned int) at C:\Users\marky\OneDrive\Documents\Arduino\libraries\arduino-audio-tools-main\src/AudioTools/VolumeStream.h line 149
return p_out->write(buffer, size);

0x400d375b: audio_tools::Equilizer3Bands::write(unsigned char const*, unsigned int) at C:\Users\marky\OneDrive\Documents\Arduino\libraries\arduino-audio-tools-main\src/AudioFilter/Equilizer.h line 109
return p_print->write(data, len);

0x400d3770: read_data_stream(unsigned char const*, unsigned int) at C:\Users\marky\OneDrive\Documents\Arduino\BTfaultfind/BTfaultfind.ino line 37
eq.write(data, length);

0x401b8612: BluetoothA2DPSink::audio_data_callback(unsigned char const*, unsigned int) at C:\Users\marky\OneDrive\Documents\Arduino\libraries\ESP32-A2DP-main\src\BluetoothA2DPSink.cpp line 1173
*(stream_reader)(data, len);

0x400d6167: ccall_audio_data_callback(uint8_t const*, uint32_t) at C:\Users\marky\OneDrive\Documents\Arduino\libraries\ESP32-A2DP-main\src\BluetoothA2DPSink.cpp line 1332
actual_bluetooth_a2dp_sink->audio_data_callback(data,len);

0x401127dd: btc_a2dp_sink_data_ready at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_sink.c line 158
0x401096fd: osi_thread_generic_event_handler at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/bt/common/osi/thread.c line 425
0x40109693: osi_thread_run at /Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/bt/common/osi/thread.c line 165

[pschatzmann]

I think it is because you write to out1 w/o having it configured and started by calling begin.
But you better configure out (after calling add) which will do this automatically.

[mooballs]

That makes complete sense, thanks again Phil you bloody legend. I'll try it asap and report back. Just out of interest, any idea why it might have worked a while ago?