Implement YaProcessData reading

src/common/serialization/vst3/process-data.cpp

@@ -20,10 +20,9 @@
 
 YaAudioBusBuffers::YaAudioBusBuffers() {}
 
-YaAudioBusBuffers::YaAudioBusBuffers(
-    Steinberg::Vst::SymbolicSampleSizes sample_size,
-    size_t num_channels,
-    size_t num_samples)
+YaAudioBusBuffers::YaAudioBusBuffers(int32 sample_size,
+                                     size_t num_channels,
+                                     size_t num_samples)
     : buffers(sample_size == Steinberg::Vst::SymbolicSampleSizes::kSample64
                   ? decltype(buffers)(std::vector<std::vector<double>>(
                         num_channels,
@@ -33,7 +32,7 @@ YaAudioBusBuffers::YaAudioBusBuffers(
                         std::vector<float>(num_samples, 0.0)))) {}
 
 YaAudioBusBuffers::YaAudioBusBuffers(
-    Steinberg::Vst::SymbolicSampleSizes sample_size,
+    int32 sample_size,
     int32 num_samples,
     const Steinberg::Vst::AudioBusBuffers& data)
     : silence_flags(data.silenceFlags) {
@@ -67,27 +66,56 @@ Steinberg::Vst::AudioBusBuffers& YaAudioBusBuffers::get() {
     reconstructed_buffers.silenceFlags = silence_flags;
     std::visit(overload{
                    [&](std::vector<std::vector<double>>& buffers) {
-                       double_buffer_pointers.clear();
+                       buffer_pointers.clear();
                        for (auto& buffer : buffers) {
-                           double_buffer_pointers.push_back(buffer.data());
+                           buffer_pointers.push_back(buffer.data());
                        }
 
                        reconstructed_buffers.numChannels = buffers.size();
                        reconstructed_buffers.channelBuffers64 =
-                           double_buffer_pointers.data();
+                           reinterpret_cast<double**>(buffer_pointers.data());
                    },
                    [&](std::vector<std::vector<float>>& buffers) {
-                       float_buffer_pointers.clear();
+                       buffer_pointers.clear();
                        for (auto& buffer : buffers) {
-                           float_buffer_pointers.push_back(buffer.data());
+                           buffer_pointers.push_back(buffer.data());
                        }
 
                        reconstructed_buffers.numChannels = buffers.size();
                        reconstructed_buffers.channelBuffers32 =
-                           float_buffer_pointers.data();
+                           reinterpret_cast<float**>(buffer_pointers.data());
                    },
                },
                buffers);
 
     return reconstructed_buffers;
 }
+
+YaProcessData::YaProcessData() {}
+
+YaProcessData::YaProcessData(const Steinberg::Vst::ProcessData& process_data)
+    : process_mode(process_data.processMode),
+      symbolic_sample_size(process_data.symbolicSampleSize),
+      num_samples(process_data.numSamples),
+      outputs_num_channels(process_data.numOutputs),
+      input_parameter_changes(*process_data.inputParameterChanges),
+      input_events(process_data.inputEvents ? std::make_optional<YaEventList>(
+                                                  *process_data.inputEvents)
+                                            : std::nullopt),
+      process_context(process_data.processContext
+                          ? std::make_optional<Steinberg::Vst::ProcessContext>(
+                                *process_data.processContext)
+                          : std::nullopt) {
+    for (int i = 0; i < process_data.numInputs; i++) {
+        inputs.emplace_back(symbolic_sample_size, num_samples,
+                            process_data.inputs[i]);
+    }
+
+    // Fetch the number of channels for each output so we can recreate these
+    // buffers in the Wine plugin host
+    for (int i = 0; i < process_data.numOutputs; i++) {
+        outputs_num_channels[i] = process_data.outputs[i].numChannels;
+    }
+}
+
+// TODO: Reconstruction

src/common/serialization/vst3/process-data.h

@@ -48,7 +48,7 @@ class YaAudioBusBuffers {
      * Create a new, zero initialize audio bus buffers object. Used to
      * reconstruct the output buffers during `YaProcessData::get()`.
      */
-    YaAudioBusBuffers(Steinberg::Vst::SymbolicSampleSizes sample_size,
+    YaAudioBusBuffers(int32 sample_size,
                       size_t num_channels,
                       size_t num_samples);
 
@@ -60,7 +60,7 @@ class YaAudioBusBuffers {
      * field determines which variant of that union to use. Similarly the
      * `ProcessData`' `numSamples` field determines the extent of these arrays.
      */
-    YaAudioBusBuffers(Steinberg::Vst::SymbolicSampleSizes sample_size,
+    YaAudioBusBuffers(int32 sample_size,
                       int32 num_samples,
                       const Steinberg::Vst::AudioBusBuffers& data);
 
@@ -96,13 +96,11 @@ class YaAudioBusBuffers {
      */
     Steinberg::Vst::AudioBusBuffers reconstructed_buffers;
 
-    // Used in reconstructed_buffers, because we need to store pointers to the
-    // inner vectors in `buffers`. We're using a union instead of void pointers
-    // here to have at least some resemblance of type safety.
-    union {
-        std::vector<float*> float_buffer_pointers;
-        std::vector<double*> double_buffer_pointers;
-    };
+    /**
+     * We need these during the reconstruction process to provide a pointer to
+     * an array of pointers to the actual buffers.
+     */
+    std::vector<void*> buffer_pointers;
 
     /**
      * A bitfield for silent channels copied directly from the input struct.
@@ -195,7 +193,7 @@ class YaProcessData {
     /**
      * The processing mode copied directly from the input struct.
      */
-    Steinberg::Vst::ProcessModes process_mode;
+    int32 process_mode;
 
     /**
      * The symbolic sample size (see `Steinberg::Vst::SymbolicSampleSizes`) is
@@ -203,7 +201,7 @@ class YaProcessData {
      * union of array of either single or double precision floating point
      * arrays. This field determines which of those variants should be used.
      */
-    Steinberg::Vst::SymbolicSampleSizes symbolic_sample_size;
+    int32 symbolic_sample_size;
 
     /**
      * The number of samples in each audio buffer.