Anyone got experience with A) Desktop Emulation and B) Microphones? #38
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Ultimately, I want to use the esp32-a1s audio kit to do all this, but it's a long road, so I'm trying to use a desktop emulation example to develop and prototype this. So I took Phil Schatzmann's excellent desktop "generator" example, and tried to initialize "in", which definitely doesn't seem to work: uint16_t sample_rate=44100; PortAudioStream out; // On desktop we use StreamCopy copier(out, in); // copy in to out // Arduino Setup // open output incfg.sample_rate = sample_rate; ret = out.begin(config); // Setup MIC? ALSA lib pcm.c:8568:(snd_pcm_recover) underrun occurred ALSA lib pcm.c:8568:(snd_pcm_recover) underrun occurred This repeats, of course. |
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Replies: 5 comments 3 replies
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I have never tried: but you would use just one PortAudioStream object for input and output. In the config you would set intput = true. Then you should be able to read and write. This is similar to I2S . I also just added the defaultConfig() method that accepts a mode parameter - like in AudioKitStream and I2Stream. So you can now call defaultConfig(RXTX_MODE); |
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Like this? uint16_t sample_rate=44100; // Arduino Setup // open output // Arduino loop Works, (thank-you very much!) but there are two issues: ALSA lib pulse.c:242:(pulse_connect) PulseAudio: Unable to connect: Connection refused ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card [I] AudioCopy.h : 121 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops and |
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I haven't used this much so I can't really help. Just to give a heads up: this will work perfectly in the AudioKit: just use aud.defaultConfig(RXTX_MODE); |
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Well, it's for both platformio and your libraries, I mean, I'm hoping to just use desktop stuff for the short term, this ultimately ends up on the esp32. Desktop = faster compile .. thanks for that! |
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Also thanks for the pointer about the config.is_input=true equivalence. That'll be handy. |
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Just a word of caution: The floating point operations on a microcontroller are much slower than on a desktop, so you will be limited in the size of the filters. Therefore you need to keep them as small as possible! |
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Got advice? Is there some way to use 16-bit ints or something? |
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Have a look at the available AudioEffects If you really need fast Filters on the ESP32 there is a DSP library written by Espressif in assempler which will outperform my generic implementation. |
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I have never tried: but you would use just one PortAudioStream object for input and output. In the config you would set intput = true. Then you should be able to read and write. This is similar to I2S .
I also just added the defaultConfig() method that accepts a mode parameter - like in AudioKitStream and I2Stream. So you can now call defaultConfig(RXTX_MODE);