How to change the hls_stream source in 'loop'?

[pete-789]

I'm using your excellent example hls-buffer-i2s.ino as the basis for this code.

Please excuse my ignorance !

Which objects would I have to stop / start (or whatever) to change the hls_stream source within the 'loop'?

Is it possible?

Skeleton code:

// audio-tools
#include "AudioTools.h"
#include "AudioTools/AudioCodecs/CodecHelix.h"
#include "AudioTools/AudioCodecs/CodecMTS.h"
#include "AudioTools/Communication/HLSStream.h"
#include "AudioTools/Concurrency/RTOS.h"
#include "AudioTools/AudioLibs/AudioBoardStream.h"

// fictitious station urls
const char *stationUrl[] = {
  PROGMEM("https://station_0.mp3"),
  PROGMEM("http://station_1.m3u8")
};

I2SCodecStream out(LyratV43);  // final output of decoded stream

BufferRTOS<uint8_t> buffer(0);
QueueStream<uint8_t> queue(buffer);
HLSStream hls_stream("secret", "secret");  // audio data source
// decoder
MP3DecoderHelix mp3;
AACDecoderHelix aac;
MTSDecoder mts(aac);             // MPEG-TS (MTS) decoder
MultiDecoder multi(hls_stream);  // MultiDecoder using mime from hls_stream
EncodedAudioOutput dec(&out, &multi);

// 2 separate copy processes
StreamCopy copier_play(dec, queue);
StreamCopy copier_write_queue(queue, hls_stream);
Task writeTask("write", 1024 * 8, 10, 0);

// Setup
void setup(void) {

  // get and set the board config
  auto config = out.defaultConfig(TX_MODE);
  
  if (!hls_stream.begin(
          stationUrl[1]))
    stop();

  // register decoders with mime types
  multi.addDecoder(mp3, "audio/mpeg");
  multi.addDecoder(aac, "audio/aac");
  multi.addDecoder(mts, "video/MP2T");  // MPEG-TS

  // start output
  out.begin(config);

  buffer.resize(10 * 1024);  // increase to 50k psram
  dec.begin();               // start decoder
  queue.begin(100);          // activate read when 100% full

  writeTask.begin([]() { copier_write_queue.copy(); });
}

// Arduino loop
void loop() { 
  copier_play.copy(); 

  // change hls_stream source here,
  // for instance to stationUrl[0]
}

[pschatzmann]

just call hls_stream.begin(url) again whenever you want to change the url!

[pete-789]

Thanks Phil, that does work but there is a considerable delay before the station changes.

Presumably this is because the copier is still 'playing' a chunk of data from the previous station... is there a way to make the changeover quicker?

[pschatzmann]

Did you try to call end ?

[pete-789]

'End' which? There are a lot of items with an end(); function !