Barely working basic playback

lib/wModel/file/audio.cpp

@@ -0,0 +1,80 @@
+#include "audio.h"
+
+#include <mad.h>
+
+M::Audio::Audio(W::Blob* p_file, const W::Address& addr, QObject* parent):
+    File(p_file, addr, parent),
+    frames()
+{
+    W::Handler* requestFrames = W::Handler::create(address + W::Address({u"requestFrames"}), this, &M::Audio::_h_requestFrames);
+    
+    addHandler(requestFrames);
+}
+
+M::Audio::~Audio()
+{}
+
+M::Model::ModelType M::Audio::getType() const
+{
+    return type;
+}
+
+void M::Audio::initAdditional(const W::String& p_mime)
+{
+    File::initAdditional(p_mime);       //TODO handle other than mp3 formats
+    
+    mad_stream stream;
+    mad_header header;
+    mad_stream_init(&stream);
+    mad_header_init(&header);
+    
+    mad_stream_buffer(&stream, file->uchar(), file->size());
+    
+    uint64_t length = 0;
+    uint64_t tBits = 0;
+    while(stream.error != MAD_ERROR_BUFLEN) {       //TODO handle other errors;
+        
+        int success = mad_header_decode(&header, &stream);
+        if (success == 0) {
+            frames.emplace_back(stream.this_frame - stream.buffer, stream.next_frame - stream.this_frame);
+            
+            length += header.duration.seconds * MAD_TIMER_RESOLUTION + header.duration.fraction;
+            tBits += header.bitrate;
+        }
+    }
+    
+    additional.insert(u"duration", new W::Uint64(length / MAD_TIMER_RESOLUTION));
+    additional.insert(u"bitrate", new W::Uint64(tBits / frames.size()));
+    additional.insert(u"framesAmount", new W::Uint64(frames.size()));
+}
+
+void M::Audio::h_requestFrames(const W::Event& ev)
+{
+    const W::Vocabulary& vc = static_cast<const W::Vocabulary&>(ev.getData());
+    const W::Uint64& index = static_cast<const W::Uint64&>(vc.at(u"index"));
+    const W::Uint64& amount = static_cast<const W::Uint64&>(vc.at(u"amount"));
+    
+    W::Vocabulary* evc = new W::Vocabulary();
+    if (index + amount > frames.size()) {
+        evc->insert(u"result", new W::Uint64(1));
+    } else {
+        evc->insert(u"result", new W::Uint64(0));
+        uint64_t start = 0;
+        uint64_t size = 0;
+        bool first = true;
+        for (int i = 0; i < amount; ++i) {
+            const std::pair<uint64_t, uint64_t>& pair = frames[index + i];
+            if (first) {
+                start = pair.first;
+                first = false;
+            }
+            size += pair.second;
+        }
+        
+        evc->insert(u"data", file->slice(start, size));
+        evc->insert(u"amount", new W::Uint64(amount));
+        
+    }
+    
+    response(evc, W::Address{u"responseFrames"}, ev);
+}

lib/wModel/file/audio.h

@@ -0,0 +1,36 @@
+#ifndef M_AUDIO_H
+#define M_AUDIO_H
+
+#include <wModel/file/file.h>
+
+#include <wType/blob.h>
+#include <deque>
+
+namespace M {
+
+    /**
+     * @todo write docs
+     */
+    class Audio : public File {
+        friend class File;
+    protected:
+        Audio(W::Blob* p_file, const W::Address& addr, QObject* parent = 0);
+        
+    public:
+        ~Audio();
+        
+        M::Model::ModelType getType() const override;
+        static const M::Model::ModelType type = audio;
+        
+    protected:
+        void initAdditional(const W::String& p_mime) override;
+        
+        handler(requestFrames);
+        
+    private:
+        std::deque<std::pair<uint64_t, uint64_t>> frames;
+    };
+
+}
+
+#endif // M_AUDIO_H

lib/wModel/file/file.cpp

@@ -1,7 +1,13 @@
 #include "file.h"
 #include <iostream>
 
+#include "audio.h"
+
 QMimeDatabase M::File::mimeDB;
+const std::map<QString, M::Model::ModelType> M::File::mimeMap = {
+    {"image/jpeg", M::Model::file},
+    {"audio/mpeg", M::Model::audio}
+};
 
 M::File::File(W::Blob* p_file, const W::Address& addr, QObject* parent):
     M::Model(addr, parent),
@@ -79,8 +85,24 @@ M::File * M::File::create(W::Blob* blob, const W::Address& addr, QObject* parent
     M::File* out;
     
     QMimeType mt = mimeDB.mimeTypeForData(blob->byteArray());
-    out = new File(blob, addr, parent);
     
-    out->initAdditional(W::String(mt.name().toStdString()));
+    const QString& mime = mt.name();
+    std::map<QString, M::Model::ModelType>::const_iterator itr = mimeMap.find(mime);
+    
+    M::Model::ModelType modelType = M::Model::file;
+    if (itr != mimeMap.end()) {
+        modelType = itr->second;
+    }
+    
+    switch (modelType) {
+        case Model::audio:
+            out = new Audio(blob, addr, parent);
+            break;
+        default:
+            out = new File(blob, addr, parent);
+            break;
+    }
+    
+    out->initAdditional(W::String(mime.toStdString()));
     return out;
 }

lib/wModel/file/file.h

@@ -38,6 +38,7 @@ namespace M {
         W::Blob* file;
         
         static QMimeDatabase mimeDB;
+        static const std::map<QString, M::Model::ModelType> mimeMap;
     };
 }