Web MIDI API back-end (work-in-progress)

content/common/media/media_param_traits.cc

Index: content/common/media/media_param_traits.cc
diff --git a/content/common/media/media_param_traits.cc b/content/common/media/media_param_traits.cc
index f833ea02a5b29371ddc1ad9d67351fcd4599cf88..ce1ea625283794e0dc7c2844c9ea17f890a24601 100644
--- a/content/common/media/media_param_traits.cc
+++ b/content/common/media/media_param_traits.cc
@@ -7,10 +7,13 @@
 #include "base/stringprintf.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/limits.h"
+#include "media/midi/midi_port_info.h"
 #include "media/video/capture/video_capture_types.h"
 
 using media::AudioParameters;
 using media::ChannelLayout;
+using media::MIDIPortInfo;
+using media::MIDIPortInfoList;
 using media::VideoCaptureParams;
 using media::VideoCaptureSessionId;
 
@@ -92,4 +95,50 @@ void ParamTraits<VideoCaptureParams>::Log(const VideoCaptureParams& p,
   l->append(base::StringPrintf("<VideoCaptureParams>"));
 }
 
+// MIDI
+
+void ParamTraits<MIDIPortInfoList>::Write(Message* m,
+                                          const MIDIPortInfoList& p) {
+  int64 n = p.size();
+  m->WriteInt64(n);
+
+  for (size_t i = 0; i < n; ++i) {
+    m->WriteString(p[i].id_);
+    m->WriteString(p[i].manufacturer_);
+    m->WriteString(p[i].name_);
+    m->WriteString(p[i].version_);
+  }
+}
+
+bool ParamTraits<MIDIPortInfoList>::Read(const Message* m,
+                                         PickleIterator* iter,
+                                         MIDIPortInfoList* r) {
+  int64 n;
+  if (!m->ReadInt64(iter, &n) || n < 0)
+    return false;
+
+  r->reserve(n);
+  for (int i = 0; i < n; ++i) {
+    std::string id;
+    std::string manufacturer;
+    std::string name;
+    std::string version;
+
+    if (!m->ReadString(iter, &id) ||
+        !m->ReadString(iter, &manufacturer) ||
+        !m->ReadString(iter, &name) ||
+        !m->ReadString(iter, &version))
+      return false;
+
+    r->push_back(MIDIPortInfo(id, manufacturer, name, version));
+  }
+
+  return true;
+}
+
+void ParamTraits<MIDIPortInfoList>::Log(const MIDIPortInfoList& p,
+                                        std::string* l) {
+  l->append(base::StringPrintf("<MIDIPortInfoList>"));
+}
+
 }