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/* Sound.cc - an object that holds the sound structure
* Copyright (C) 2006-2007, Pino Toscano <pino@kde.org>
* Copyright (C) 2009, 2017-2020, Albert Astals Cid <aacid@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "GooString.h"
#include "Object.h"
#include "Sound.h"
#include "Stream.h"
#include "FileSpec.h"
Sound *Sound::parseSound(Object *obj)
{
// let's try to see if this Object is a Sound, according to the PDF specs
// (section 9.2)
Stream *str = nullptr;
// the Object must be a Stream
if (obj->isStream()) {
str = obj->getStream();
} else {
return nullptr;
}
// the Stream must have a Dict
Dict *dict = str->getDict();
if (dict == nullptr)
return nullptr;
// the Dict must have the 'R' key of type num
Object tmp = dict->lookup("R");
if (tmp.isNum()) {
return new Sound(obj);
} else {
return nullptr;
}
}
Sound::Sound(const Object *obj, bool readAttrs)
{
streamObj = obj->copy();
samplingRate = 0.0;
channels = 1;
bitsPerSample = 8;
encoding = soundRaw;
if (readAttrs)
{
Dict *dict = streamObj.getStream()->getDict();
Object tmp = dict->lookup("F");
if (!tmp.isNull()) {
// valid 'F' key -> external file
kind = soundExternal;
Object obj1 = getFileSpecNameForPlatform (&tmp);
if (obj1.isString()) {
fileName = obj1.getString()->toStr();
}
} else {
// no file specification, then the sound data have to be
// extracted from the stream
kind = soundEmbedded;
}
// sampling rate
samplingRate = dict->lookup("R").getNumWithDefaultValue(0);
// sound channels
tmp = dict->lookup("C");
if (tmp.isInt()) {
channels = tmp.getInt();
}
// bits per sample
tmp = dict->lookup("B");
if (tmp.isInt()) {
bitsPerSample = tmp.getInt();
}
// encoding format
tmp = dict->lookup("E");
if (tmp.isName())
{
const char *enc = tmp.getName();
if (strcmp("Raw", enc) == 0) {
encoding = soundRaw;
} else if (strcmp("Signed", enc) == 0) {
encoding = soundSigned;
} else if (strcmp("muLaw", enc) == 0) {
encoding = soundMuLaw;
} else if (strcmp("ALaw", enc) == 0) {
encoding = soundALaw;
}
}
}
}
Sound::~Sound()
{
}
Stream *Sound::getStream()
{
return streamObj.getStream();
}
Sound *Sound::copy() const
{
Sound *newsound = new Sound(&streamObj, false);
newsound->kind = kind;
newsound->fileName = fileName;
newsound->samplingRate = samplingRate;
newsound->channels = channels;
newsound->bitsPerSample = bitsPerSample;
newsound->encoding = encoding;
return newsound;
}
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