Serial Stream from ESP32 >> ESP32 #2011
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@pschatzmann is there a way to pipe a URLStream or an ICYStream's data as received, over to another microcontroller (this one with wifi off) over a suitably sized Serial data, for eventual consumption and I2S output in the second microcontroller , without having to resort to ADPCM comp/decompression like in the send-adpcm_framed-receive example ? What do you suggest as a pipeline? ThankYou. |
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Replies: 3 comments · 39 replies
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I don't quite understand your question: The audio data transmitted via URLStream or ICYStream is usually mp3 or aac, so it is already complressed with a codec that is much better then ADPCM! Just make sure that the baud rate is high enough if you want to live play... |
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from previous tests, even sending out chunks of 4096 bytes at 2Mb/s worked well ( not sound wise - just the packets arrived intact is what I meant). |
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What I'd like is the send the chunks as fast as possible to the 2nd MCU, which will then process them at its own pace. |
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This has nothing to do with my library: I already told you that you need to implement Serial data synchronization to prevent loosing data (eg. using the ctsPin and rtxPin). Or you could implement a big buffer on the receiving side and implement your own synchronization protocol. |
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Or you could write to a file to make sure that you don't loose any data assuming that you will never run out of disk space.... |
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@pschatzmann ThankYou for your patience and interaction. As a tinkerer / beginner, I think I'm going to give up. |
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@pschatzmann , if I use a circular buffer for the serial data instead of extra cables for CTS and RTX, perhaps it may work ? |
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Just added an untested example using xon-xoff over serial |
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@pschatzmann That's super !!!! Going to test it soon. Also, in the Sender code, why do you instatiate the "AudioBoardStream i2s(AudioKitEs8388V1); // final output of decoded stream" if the sender is not going to use I2S ? Thanks ! |
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nevermind... its compiling now !! |
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Bingo !!!! @pschatzmann You are an absolute Legend !!!! |
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Phil, I'm trying to extract ICY Metadata on the recevier ESP32, but I'm getting stuck.
but the types do not match, neither does "Serial1" instead of "queue". is "queue" the right pipe to choose for this or does it require some more work on the communication class ? |
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not all streams are created equal. You can always write to or read from them but there is no obligation they have a setCallback method. Only MetaDataOutput streams promise to have the callback you want. Your queue or Serial1 have not. |
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I don't quite understand your question: The audio data transmitted via URLStream or ICYStream is usually mp3 or aac, so it is already complressed with a codec that is much better then ADPCM!
Just make sure that the baud rate is high enough if you want to live play...