use libtag duration where available

src/app_console/app_console.cpp

@@ -112,17 +112,13 @@ int CmdPlayFile(int argc, char** argv) {
     database::TrackId id = std::atoi(argv[1]);
     AppConsole::sTrackQueue->AddLast(id);
   } else {
-    // TODO.
-    /*
     std::ostringstream path;
     path << '/' << argv[1];
     for (int i = 2; i < argc; i++) {
       path << ' ' << argv[i];
     }
 
-    events::Dispatch<audio::PlayFile, audio::AudioState>(
-        audio::PlayFile{.filename = path.str()});
-        */
+    events::Audio().Dispatch(audio::PlayFile{.filename = path.str()});
   }
 
   return 0;

src/audio/audio_fsm.cpp

@@ -93,6 +93,10 @@ void Uninitialised::react(const system_fsm::BootComplete&) {
   transit<Standby>();
 }
 
+void Standby::react(const PlayFile& ev) {
+  sFileSource->SetPath(ev.filename);
+}
+
 void Standby::react(const internal::InputFileOpened& ev) {
   transit<Playback>();
 }
@@ -161,6 +165,9 @@ void Playback::react(const internal::InputFileClosed& ev) {}
 void Playback::react(const internal::InputFileFinished& ev) {
   ESP_LOGI(kTag, "finished playing file");
   sTrackQueue->Next();
+  if (!sTrackQueue->GetCurrent()) {
+    transit<Standby>();
+  }
 }
 
 void Playback::react(const internal::AudioPipelineIdle& ev) {

src/audio/audio_task.cpp

@@ -61,10 +61,12 @@ Timer::Timer(StreamInfo::Pcm format)
 
 auto Timer::SetLengthSeconds(uint32_t len) -> void {
   total_duration_seconds_ = len;
+  has_duration_ = true;
 }
 
 auto Timer::SetLengthBytes(uint32_t len) -> void {
   total_duration_seconds_ = bytes_to_samples(len) / format_.sample_rate;
+  has_duration_ = true;
 }
 
 auto Timer::AddBytes(std::size_t bytes) -> void {
@@ -135,8 +137,14 @@ void AudioTask::Main() {
             if (ForwardPcmStream(*pcm, stream.data())) {
               stream.consume(stream.data().size_bytes());
             }
+            if (!timer_->has_duration()) {
+              if (stream.info().total_length_seconds()) {
+                timer_->SetLengthSeconds(*stream.info().total_length_seconds());
+              } else {
                 timer_->SetLengthBytes(
                     stream.info().total_length_bytes().value_or(0));
+              }
+            }
             return;
           }
 
@@ -233,6 +241,8 @@ auto AudioTask::BeginDecoding(InputStream& stream) -> bool {
 
   if (format.duration_seconds) {
     timer_->SetLengthSeconds(*format.duration_seconds);
+  } else if (stream.info().total_length_seconds()) {
+    timer_->SetLengthSeconds(*stream.info().total_length_seconds());
   } else {
     timer_->SetLengthBytes(stream.info().total_length_bytes().value_or(0));
   }

src/audio/fatfs_audio_input.cpp

@@ -283,6 +283,9 @@ auto FatfsAudioInput::OpenFile(const std::string& path) -> void {
 
   OutputStream writer{input_buffer_.get()};
   writer.prepare(format, info.fsize);
+  if (tags.duration) {
+    writer.info().total_length_seconds() = *tags.duration;
+  }
 
   streamer_->Restart(std::move(file));
   is_first_read_ = true;

src/audio/include/audio_events.hpp

@@ -30,6 +30,10 @@ struct QueueUpdate : tinyfsm::Event {
   bool current_changed;
 };
 
+struct PlayFile : tinyfsm::Event {
+  std::string filename;
+};
+
 struct VolumeChanged : tinyfsm::Event {};
 
 namespace internal {

src/audio/include/audio_fsm.hpp

@@ -51,6 +51,7 @@ class AudioState : public tinyfsm::Fsm<AudioState> {
 
   virtual void react(const system_fsm::BootComplete&) {}
 
+  virtual void react(const PlayFile&) {}
   virtual void react(const QueueUpdate&) {}
   virtual void react(const PlaybackUpdate&) {}
 
@@ -82,6 +83,7 @@ class Uninitialised : public AudioState {
 
 class Standby : public AudioState {
  public:
+  void react(const PlayFile&) override;
   void react(const internal::InputFileOpened&) override;
   void react(const QueueUpdate&) override;
 

src/audio/include/audio_task.hpp

@@ -26,6 +26,7 @@ class Timer {
   auto SetLengthBytes(uint32_t) -> void;
 
   auto AddBytes(std::size_t) -> void;
+  auto has_duration() const -> bool { return has_duration_; }
 
  private:
   auto bytes_to_samples(uint32_t) -> uint32_t;
@@ -35,6 +36,7 @@ class Timer {
   uint32_t current_seconds_;
   uint32_t current_sample_in_second_;
 
+  bool has_duration_;
   uint32_t total_duration_seconds_;
 };
 

src/audio/include/stream_info.hpp

@@ -42,6 +42,13 @@ class StreamInfo {
     return total_length_bytes_;
   }
 
+  auto total_length_seconds() -> std::optional<std::uint32_t>& {
+    return total_length_seconds_;
+  }
+  auto total_length_seconds() const -> std::optional<std::uint32_t> {
+    return total_length_seconds_;
+  }
+
   struct Encoded {
     // The codec that this stream is associated with.
     codecs::StreamType type;
@@ -77,6 +84,7 @@ class StreamInfo {
  private:
   std::size_t bytes_in_stream_;
   std::optional<std::uint32_t> total_length_bytes_;
+  std::optional<std::uint32_t> total_length_seconds_;
   Format format_{};
 };