WIP track down new pipeline memory issues

src/audio/audio_decoder.cpp

@@ -66,20 +66,13 @@ auto AudioDecoder::ProcessStreamInfo(const StreamInfo& info) -> bool {
 
 auto AudioDecoder::Process(const std::vector<InputStream>& inputs,
                            OutputStream* output) -> void {
-  // We don't really expect multiple inputs, so just pick the first that
-  // contains data. If none of them contain data, then we can still flush
-  // pending samples.
-  auto input = std::find_if(
-      inputs.begin(), inputs.end(),
-      [](const InputStream& s) { return s.data().size_bytes() > 0; });
-  if (input == inputs.end()) {
-    input = inputs.begin();
-  }
-
+  auto input = inputs.begin();
   const StreamInfo& info = input->info();
-  if (std::holds_alternative<std::monostate>(info.format)) {
+  if (std::holds_alternative<std::monostate>(info.format) || info.bytes_in_stream == 0) {
+    output->prepare({});
     return;
   }
+
   if (!current_input_format_ || *current_input_format_ != info.format) {
     // The input stream has changed! Immediately throw everything away and
     // start from scratch.
@@ -133,7 +126,8 @@ auto AudioDecoder::Process(const std::vector<InputStream>& inputs,
     }
   }
 
-  input->consume(current_codec_->GetInputPosition());
+  ESP_LOGI(kTag, "decoded %u bytes", current_codec_->GetInputPosition() - 1);
+  input->consume(current_codec_->GetInputPosition() - 1);
 }
 
 }  // namespace audio

src/audio/audio_task.cpp

@@ -130,9 +130,7 @@ void AudioTaskMain(void* args) {
           continue;
         }
 
-        if ((!output_format || output_format != sink_stream.info().format) &&
-            !std::holds_alternative<std::monostate>(
-                sink_stream.info().format)) {
+        if (!output_format || output_format != sink_stream.info().format) {
           // The format of the stream within the sink stream has changed. We
           // need to reconfigure the sink, but shouldn't do so until we've fully
           // drained the current buffer.
@@ -145,7 +143,7 @@ void AudioTaskMain(void* args) {
 
         // We've reconfigured the sink, or it was already configured correctly.
         // Send through some data.
-        if (output_format == sink_stream.info().format) {
+        if (output_format == sink_stream.info().format && !std::holds_alternative<std::monostate>(*output_format)) {
           // TODO: tune the delay on this, as it's currently the only way to
           // throttle this task's CPU time. Maybe also hold off on the pipeline
           // if the buffer is already close to full?

src/audio/fatfs_audio_input.cpp

@@ -4,6 +4,7 @@
 #include <cstdint>
 #include <memory>
 #include <string>
+#include <variant>
 
 #include "arena.hpp"
 #include "esp_heap_caps.h"
@@ -47,6 +48,7 @@ auto FatfsAudioInput::OpenFile(const std::string& path) -> void {
 auto FatfsAudioInput::Process(const std::vector<InputStream>& inputs,
                               OutputStream* output) -> void {
   if (!is_file_open_) {
+    output->prepare({});
     return;
   }
 

src/drivers/include/dac.hpp

@@ -26,7 +26,7 @@ class Register {
   uint8_t page;
   uint8_t reg;
 
-  constexpr Register(uint8_t page, uint8_t reg) : page(page), reg(reg) {}
+  constexpr Register(uint8_t p, uint8_t r) : page(p), reg(r) {}
 };
 
 constexpr Register RESET(0, 1);