ESP32 Forum

Posted: **Thu Mar 12, 2020 5:15 pm**

Hello,

In my project I want to mix MP3 audios with VoIP (not at the same time) with the codec. The board used is LyraT v4.3.

So after I realice that the read and write pipelines must be relinked (as the flexible_pipeline example shows) I implement the same steps used but with the filter / raw and I2S components.

Steps followed:
- Initialization:
1.- Init board
2.- Init I2S reader and writer -> register it into the pipelines
3.- Init filter and raw stream -> register it into the reader pipeline
4.- Init reader event and set it as a listener.
5.- Init filter and raw stream -> register it into the writer pipeline
6.- Init writer event and set it as a listener.

- Start process (reader)
1.- invoke audio_pipeline_breakup_elements to clean all elements (due to compatibility with MP3)
2.- Relink components: {"i2s_r", "filter_r", "raw_r"}
3.- Set listener
4.- Reset ringbuffer, elements and change state to AEL_STATE_INIT
5.- run and resume pipeline

- Start process (writer)
1.- invoke audio_pipeline_breakup_elements to clean all elements (due to compatibility with MP3)
2.- Relink components: "raw_w", "filter_w", "i2s_w"}
3.- Set listener
4.- Reset ringbuffer, elements and change state to AEL_STATE_INIT
5.- run and resume pipeline

- Read from microphone and reproduce it over the speaker

- Stop process (writer)
1.- pause element
2.- pause pipeline

- Stop process (reader)
1.- pause element
2.- pause pipeline

At this point i'm trying to reopen it from the start processes.

I got the microphone enable again but the speaker doesn't turned on again.

Have anyone any idea how it can be?

Posted: **Fri Mar 13, 2020 7:26 pm**

HI
I had a few problems with this also, don't know if I'm doing it correctly - but this worked for me,
and I tried many different things.

Code: Select all

	
	audio_pipeline_terminate(pipeline);

	if (strstr(Mp3Files[Mp3Stack[Mp3StackPos]].c_str(), (const char*)".mp3"))
		{
		audio_decoder = mp3_decoder;
		const char * boomer[]{ "FatReader", "mp3Decoder","DspOutput", "i2s-out" };
		audio_pipeline_link(pipeline, boomer, 4);
		SongExt = "MP3";
		}
	else
		{
		audio_decoder = flac_decoder;
		const char * boomer[]{ "FatReader", "flacDecoder", "DspOutput","i2s-out" };
		audio_pipeline_link(pipeline, boomer, 4);
		SongExt = "FLC";

		}
	audio_pipeline_set_listener(pipeline, evt);
	audio_element_set_uri(PlayFatStream, ("/sdcard" + filename).c_str());

	audio_pipeline_run(pipeline);
	audio_pipeline_resume(pipeline);

Hope that helps!!

Posted: **Mon Mar 16, 2020 1:21 pm**

Hello shabtronic, thanks so much for your reply.

From your answer I just to add some lines to make it work.

audio_pipeline_reset_ringbuffer(pipeline_audio_writer);
audio_pipeline_reset_elements(pipeline_audio_writer);
audio_pipeline_change_state(pipeline_audio_writer, AEL_STATE_INIT);

After this, there is no neeed to reset the module after all.

Thanks so much.

ESP32 Forum

How to relink components from VoIP example

How to relink components from VoIP example

Re: How to relink components from VoIP example

Re: How to relink components from VoIP example