radio/lib/wModel/file/audio.cpp

#include "audio.h"

#include <mad.h>

M::Audio::Audio(W::Blob* p_file, const W::Address& addr, QObject* parent):
    File(p_file, addr, parent)
{
}

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;
    uint64_t amount = 0;
    while(stream.error != MAD_ERROR_BUFLEN) {       //TODO handle other errors;
        
        int success = mad_header_decode(&header, &stream);
        if (success == 0) {
            
            amount++;
            length += header.duration.seconds * MAD_TIMER_RESOLUTION + header.duration.fraction;
            tBits += header.bitrate;
        }
    }
    
    additional.insert(u"duration", new W::Uint64(length * 1000 / MAD_TIMER_RESOLUTION));
    additional.insert(u"bitrate", new W::Uint64(tBits / amount));
}