Support playing tracks by track id

src/audio/audio_decoder.cpp

@@ -89,9 +89,11 @@ auto AudioDecoder::Process(const std::vector<InputStream>& inputs,
   // Check the input stream's format has changed (or, by extension, if this is
   // the first stream).
   if (!current_input_format_ || *current_input_format_ != info.format) {
-    ESP_LOGI(kTag, "beginning new stream");
     has_samples_to_send_ = false;
-    ProcessStreamInfo(info);
+    if (!ProcessStreamInfo(info)) {
+      return;
+    }
+    ESP_LOGI(kTag, "beginning new stream");
     auto res = current_codec_->BeginStream(input->data());
     input->consume(res.first);
     if (res.second.has_error()) {

src/audio/audio_fsm.cpp

@@ -5,6 +5,7 @@
  */
 
 #include "audio_fsm.hpp"
+#include <future>
 #include <memory>
 #include <variant>
 #include "audio_decoder.hpp"
@@ -14,6 +15,7 @@
 #include "i2s_audio_output.hpp"
 #include "i2s_dac.hpp"
 #include "pipeline.hpp"
+#include "track.hpp"
 
 namespace audio {
 
@@ -59,18 +61,38 @@ auto AudioState::Init(drivers::GpioExpander* gpio_expander,
   return true;
 }
 
+void AudioState::react(const system_fsm::StorageMounted& ev) {
+  sDatabase = ev.db;
+}
+
 namespace states {
 
 void Uninitialised::react(const system_fsm::BootComplete&) {
   transit<Standby>();
 }
 
-void Standby::react(const PlayFile& ev) {
+void Standby::react(const InputFileOpened& ev) {
-  if (sFileSource->OpenFile(ev.filename)) {
   transit<Playback>();
+}
+
+void Standby::react(const PlayTrack& ev) {
+  auto db = sDatabase.lock();
+  if (!db) {
+    ESP_LOGW(kTag, "database not open; ignoring play request");
+    return;
+  }
+
+  if (ev.data) {
+    sFileSource->OpenFile(ev.data->filepath());
+  } else {
+    sFileSource->OpenFile(db->GetTrackPath(ev.id));
   }
 }
 
+void Standby::react(const PlayFile& ev) {
+  sFileSource->OpenFile(ev.filename);
+}
+
 void Playback::entry() {
   ESP_LOGI(kTag, "beginning playback");
   sI2SOutput->SetInUse(true);
@@ -81,6 +103,16 @@ void Playback::exit() {
   sI2SOutput->SetInUse(false);
 }
 
+void Playback::react(const PlayTrack& ev) {
+  sTrackQueue.push_back(EnqueuedItem(ev.id));
+}
+
+void Playback::react(const PlayFile& ev) {
+  sTrackQueue.push_back(EnqueuedItem(ev.filename));
+}
+
+void Playback::react(const InputFileOpened& ev) {}
+
 void Playback::react(const InputFileFinished& ev) {
   ESP_LOGI(kTag, "finished file");
   if (sTrackQueue.empty()) {
@@ -91,6 +123,14 @@ void Playback::react(const InputFileFinished& ev) {
 
   if (std::holds_alternative<std::string>(next_item)) {
     sFileSource->OpenFile(std::get<std::string>(next_item));
+  } else if (std::holds_alternative<database::TrackId>(next_item)) {
+    auto db = sDatabase.lock();
+    if (!db) {
+      ESP_LOGW(kTag, "database not open; ignoring play request");
+      return;
+    }
+    sFileSource->OpenFile(
+        db->GetTrackPath(std::get<database::TrackId>(next_item)));
   }
 }
 

src/audio/fatfs_audio_input.cpp

@@ -8,7 +8,9 @@
 #include <stdint.h>
 
 #include <algorithm>
+#include <chrono>
 #include <cstdint>
+#include <future>
 #include <memory>
 #include <string>
 #include <variant>
@@ -38,6 +40,7 @@ namespace audio {
 
 FatfsAudioInput::FatfsAudioInput()
     : IAudioElement(),
+      pending_path_(),
       current_file_(),
       is_file_open_(false),
       current_container_(),
@@ -45,11 +48,19 @@ FatfsAudioInput::FatfsAudioInput()
 
 FatfsAudioInput::~FatfsAudioInput() {}
 
+auto FatfsAudioInput::OpenFile(std::future<std::optional<std::string>>&& path)
+    -> void {
+  pending_path_ = std::move(path);
+}
+
 auto FatfsAudioInput::OpenFile(const std::string& path) -> bool {
   if (is_file_open_) {
     f_close(&current_file_);
     is_file_open_ = false;
   }
+  if (pending_path_) {
+    pending_path_ = {};
+  }
   ESP_LOGI(kTag, "opening file %s", path.c_str());
 
   database::TagParserImpl tag_parser;
@@ -89,16 +100,33 @@ auto FatfsAudioInput::OpenFile(const std::string& path) -> bool {
     return false;
   }
 
+  events::Dispatch<InputFileOpened, AudioState>({});
   is_file_open_ = true;
   return true;
 }
 
 auto FatfsAudioInput::NeedsToProcess() const -> bool {
-  return is_file_open_;
+  return is_file_open_ || pending_path_;
 }
 
 auto FatfsAudioInput::Process(const std::vector<InputStream>& inputs,
                               OutputStream* output) -> void {
+  if (pending_path_) {
+    ESP_LOGI(kTag, "waiting for path");
+    if (!pending_path_->valid()) {
+      pending_path_ = {};
+    } else {
+      if (pending_path_->wait_for(std::chrono::seconds(0)) ==
+          std::future_status::ready) {
+        ESP_LOGI(kTag, "path ready!");
+        auto result = pending_path_->get();
+        if (result) {
+          OpenFile(*result);
+        }
+      }
+    }
+  }
+
   if (!is_file_open_) {
     return;
   }

src/audio/include/audio_events.hpp

@@ -21,9 +21,9 @@ struct PlayFile : tinyfsm::Event {
 struct PlayTrack : tinyfsm::Event {
   database::TrackId id;
   std::optional<database::TrackData> data;
-  std::optional<database::TrackTags> tags;
 };
 
+struct InputFileOpened : tinyfsm::Event {};
 struct InputFileFinished : tinyfsm::Event {};
 struct AudioPipelineIdle : tinyfsm::Event {};
 

src/audio/include/audio_fsm.hpp

@@ -38,10 +38,13 @@ class AudioState : public tinyfsm::Fsm<AudioState> {
   /* Fallback event handler. Does nothing. */
   void react(const tinyfsm::Event& ev) {}
 
+  void react(const system_fsm::StorageMounted&);
+
   virtual void react(const system_fsm::BootComplete&) {}
   virtual void react(const PlayTrack&) {}
   virtual void react(const PlayFile&) {}
 
+  virtual void react(const InputFileOpened&) {}
   virtual void react(const InputFileFinished&) {}
   virtual void react(const AudioPipelineIdle&) {}
 
@@ -69,8 +72,10 @@ class Uninitialised : public AudioState {
 
 class Standby : public AudioState {
  public:
-  void react(const PlayTrack&) override {}
+  void react(const InputFileOpened&) override;
+  void react(const PlayTrack&) override;
   void react(const PlayFile&) override;
+
   using AudioState::react;
 };
 
@@ -79,6 +84,10 @@ class Playback : public AudioState {
   void entry() override;
   void exit() override;
 
+  void react(const PlayTrack&) override;
+  void react(const PlayFile&) override;
+
+  void react(const InputFileOpened&) override;
   void react(const InputFileFinished&) override;
   void react(const AudioPipelineIdle&) override;
 

src/audio/include/fatfs_audio_input.hpp

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <cstdint>
+#include <future>
 #include <memory>
 #include <string>
 #include <vector>
@@ -33,6 +34,7 @@ class FatfsAudioInput : public IAudioElement {
   FatfsAudioInput();
   ~FatfsAudioInput();
 
+  auto OpenFile(std::future<std::optional<std::string>>&& path) -> void;
   auto OpenFile(const std::string& path) -> bool;
 
   auto NeedsToProcess() const -> bool override;
@@ -47,6 +49,7 @@ class FatfsAudioInput : public IAudioElement {
   auto ContainerToStreamType(database::Encoding)
       -> std::optional<codecs::StreamType>;
 
+  std::optional<std::future<std::optional<std::string>>> pending_path_;
   FIL current_file_;
   bool is_file_open_;
 

src/database/database.cpp

@@ -229,6 +229,18 @@ auto Database::Update() -> std::future<void> {
   });
 }
 
+auto Database::GetTrackPath(TrackId id)
+    -> std::future<std::optional<std::string>> {
+  return worker_task_->Dispatch<std::optional<std::string>>(
+      [=, this]() -> std::optional<std::string> {
+        auto track_data = dbGetTrackData(id);
+        if (track_data) {
+          return track_data->filepath();
+        }
+        return {};
+      });
+}
+
 auto Database::GetTracks(std::size_t page_size) -> std::future<Result<Track>*> {
   return worker_task_->Dispatch<Result<Track>*>([=, this]() -> Result<Track>* {
     Continuation<Track> c{.iterator = nullptr,

src/database/include/database.hpp

@@ -82,6 +82,8 @@ class Database {
 
   auto Update() -> std::future<void>;
 
+  auto GetTrackPath(TrackId id) -> std::future<std::optional<std::string>>;
+
   auto GetTracks(std::size_t page_size) -> std::future<Result<Track>*>;
   auto GetDump(std::size_t page_size) -> std::future<Result<std::string>*>;
 

src/system_fsm/include/system_events.hpp

@@ -6,6 +6,9 @@
 
 #pragma once
 
+#include <memory>
+
+#include "database.hpp"
 #include "tinyfsm.hpp"
 
 namespace system_fsm {
@@ -38,7 +41,9 @@ struct StorageUnmountRequested : tinyfsm::Event {};
 /*
  * Sent by SysState when the system storage has been successfully mounted.
  */
-struct StorageMounted : tinyfsm::Event {};
+struct StorageMounted : tinyfsm::Event {
+  std::weak_ptr<database::Database> db;
+};
 
 struct StorageError : tinyfsm::Event {};
 

src/system_fsm/running.cpp

@@ -50,7 +50,7 @@ void Running::entry() {
 
   ESP_LOGI(kTag, "storage loaded okay");
   events::Dispatch<StorageMounted, SystemState, audio::AudioState, ui::UiState>(
-      StorageMounted());
+      StorageMounted{.db = sDatabase});
 }
 
 void Running::exit() {

src/tasks/tasks.cpp

@@ -45,7 +45,7 @@ auto AllocateStack() -> cpp::span<StackType_t>;
 // amount of stack space.
 template <>
 auto AllocateStack<Type::kAudio>() -> cpp::span<StackType_t> {
-  std::size_t size = 32 * 1024;
+  std::size_t size = 48 * 1024;
   return {static_cast<StackType_t*>(heap_caps_malloc(size, MALLOC_CAP_DEFAULT)),
           size};
 }