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