Buffer size for ESP32 I2S

Author: pschatzmann

examples/tests/codecs/test-codec-aac-fdk-dec/test-codec-aac-fdk-dec.ino

@@ -0,0 +1,29 @@
+#include "AudioTools.h"
+#include "AudioCodecs/CodecAACFDK.h"
+#include "AudioLibs/AudioBoardStream.h"
+
+URLStream url("ssid","password");  // or replace with ICYStream to get metadata
+AudioBoardStream i2s(AudioKitEs8388V1); // final output of decoded stream
+EncodedAudioStream dec(&i2s, new AACDecoderFDK()); // Decoding stream
+StreamCopy copier(dec, url); // copy url to decoder
+
+
+void setup(){
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial, AudioLogger::Info);  
+
+  // setup i2s
+  auto config = i2s.defaultConfig(TX_MODE);
+  i2s.begin(config);
+
+  // setup I2S based on sampling rate provided by decoder
+  dec.begin();
+
+  // aac radio
+  url.begin("http://peacefulpiano.stream.publicradio.org/peacefulpiano.aac","audio/aac");
+
+}
+
+void loop(){
+  copier.copy();
+}

src/AudioI2S/I2SConfigESP32V1.h

@@ -79,6 +79,8 @@ class I2SConfigESP32V1 : public AudioInfo {
       LOGI("bits per sample: %d", bits_per_sample);
       LOGI("number of channels: %d", channels);
       LOGI("signal_type: %s", i2s_signal_types[signal_type]);      
+      LOGI("buffer_count:%d", buffer_count);
+      LOGI("buffer_size:%d", buffer_size);
       if (signal_type==Digital){
         LOGI("i2s_format: %s", i2s_formats[i2s_format]);      
       } 

src/AudioI2S/I2SESP32V1.h

@@ -195,9 +195,14 @@ class I2SDriverESP32V1 {
 
     i2s_chan_config_t getChannelConfig(I2SConfigESP32V1 &cfg) {
       TRACED();
-      return I2S_CHANNEL_DEFAULT_CONFIG(
+      i2s_chan_config_t result = I2S_CHANNEL_DEFAULT_CONFIG(
           (i2s_port_t)cfg.port_no,
           cfg.is_master ? I2S_ROLE_MASTER : I2S_ROLE_SLAVE);
+      // use the legicy size parameters for frame num
+      int size = cfg.buffer_size * cfg.buffer_count;
+      int frame_size = cfg.bits_per_sample * cfg.channels / 8;
+      if (size > 0) result.dma_frame_num = size / frame_size;
+      return result;
     }
 
     i2s_std_clk_config_t getClockConfig(I2SConfigESP32V1 &cfg) {