Seeking in AudioGeneratorWAV gets invalid RIFF header

[alittlebitweird]

Hello all!

I successfully got ESP8266Audio running on my ESP32, and it is outputting a wav file read from an SD card via a pcm5102 DAC.

I need to be able to dynamically seek to different positions in the wav file and play it back at varying speeds. I read through the code and it seemed like the right way to do this is to call file->seek(5, SEEK_SET).

Calling this function in combination with file->getPos shows that I am indeed increasing the position from 0 -> 5 (seconds? miliseconds?). Unfortunately, when I do this, the audio fails to play and outputs the following error:

AudioGeneratorWAV::ReadWAVInfo: cannot read WAV, invalid RIFF header, got: 570225EE
AudioGeneratorWAV::begin: failed during ReadWAVInfo

Here is the full ESP8266Audio implementation, in case it helps:

static const i2s_config_t i2s_config = {
  .mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_TX),
  .sample_rate = 44100,
  .bits_per_sample = i2s_bits_per_sample_t(16),
  .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
  .communication_format = i2s_comm_format_t(0x01), // I2S_COMM_FORMAT_STAND_I2S,
  .intr_alloc_flags = 0, // default interrupt priority
  .dma_buf_count = 8,
  .dma_buf_len = 64,
  .use_apll = false
};

static const i2s_pin_config_t pin_config = {
  .bck_io_num = i2sBitClockPin,
  .ws_io_num = i2sLeftRightClockPin,
  .data_out_num = i2sDataOutPin,
  .data_in_num = I2S_PIN_NO_CHANGE
};

void setup() {
  i2s_driver_install(i2s_port_t(i2sPortNumber), &i2s_config, 0, NULL);
  i2s_set_pin(i2s_port_t(i2sPortNumber), &pin_config);

  audioLogger = &Serial;

  dac = new AudioOutputI2S();
  wav = new AudioGeneratorWAV();
  file = new AudioFileSourceSD("/gnome.wav");

  file->seek(5, SEEK_SET);
  wav->begin(file, dac);
}

void loop() {
   if (wav->isRunning()) {
     if (!wav->loop()) {
       wav->stop();
       Serial.println("Stopped");
     }
   }
}

[fizicko]

Hello! Did you find a way to adjust the playback speed?