File indexing completed on 2024-05-12 04:55:36 

0001 /**
0002  * \file gstfingerprintdecoder.h
0003  * Chromaprint fingerprint decoder using GStreamer.
0004  *
0005  * \b Project: Kid3
0006  * \author Urs Fleisch
0007  * \date 15 Feb 2013
0008  *
0009  * Copyright (C) 2013-2018  Urs Fleisch
0010  *
0011  * This file is part of Kid3.
0012  *
0013  * Kid3 is free software; you can redistribute it and/or modify
0014  * it under the terms of the GNU General Public License as published by
0015  * the Free Software Foundation; either version 2 of the License, or
0016  * (at your option) any later version.
0017  *
0018  * Kid3 is distributed in the hope that it will be useful,
0019  * but WITHOUT ANY WARRANTY; without even the implied warranty of
0020  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0021  * GNU General Public License for more details.
0022  *
0023  * You should have received a copy of the GNU General Public License
0024  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
0025  */
0026 
0027 #pragma once
0028 
0029 #include <gst/gst.h>
0030 #include "abstractfingerprintdecoder.h"
0031 #include "fingerprintcalculator.h"
0032 
0033 /**
0034  * Chromaprint fingerprint decoder using GStreamer.
0035  */
0036 class GstFingerprintDecoder : public AbstractFingerprintDecoder {
0037 public:
0038   /**
0039    * Constructor.
0040    * @param parent parent object
0041    */
0042   explicit GstFingerprintDecoder(QObject* parent = 0);
0043 
0044   /**
0045    * Destructor.
0046    */
0047   virtual ~GstFingerprintDecoder();
0048 
0049   /**
0050    * Run decoder on audio file.
0051    * @param filePath path to audio file
0052    */
0053   virtual void start(const QString& filePath);
0054 
0055   /**
0056    * Stop decoder.
0057    * Can be used to stop the decoder when an error is found after
0058    * getting bufferReady() data.
0059    */
0060   virtual void stop();
0061 
0062 private:
0063   static const int BUFFER_SIZE = 10;
0064   static const gint64 MAX_LENGTH_NS = 120000000000;
0065   static const guint TIMEOUT_MS = 5000;
0066 
0067   void raiseError(FingerprintCalculator::Error error);
0068   static gboolean cb_timeout(gpointer data);
0069   static void cb_message(GstBus* bus, GstMessage* message,
0070                          GstFingerprintDecoder* self);
0071   static void cb_pad_added(GstElement* dec, GstPad* pad,
0072                            GstFingerprintDecoder* self);
0073   static void cb_no_more_pads(GstElement* dec, GstFingerprintDecoder* self);
0074   static void cb_notify_caps(GstPad *pad, GParamSpec* spec,
0075                              GstFingerprintDecoder* self);
0076   static void cb_unknown_type(GstElement* dec, GstPad* pad, GstCaps* caps,
0077                               GstFingerprintDecoder* self);
0078   static void cb_new_buffer(GstElement* sink, GstFingerprintDecoder* self);
0079 
0080   GMainLoop* m_loop;
0081   GstElement* m_pipeline;
0082   GstElement* m_dec;
0083   GstElement* m_conv;
0084   FingerprintCalculator::Error m_error;
0085   int m_duration;
0086   gint m_channels;
0087   gint m_rate;
0088   bool m_gotPad;
0089 };