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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2015 - ROLI Ltd.
Permission is granted to use this software under the terms of either:
a) the GPL v2 (or any later version)
b) the Affero GPL v3
Details of these licenses can be found at: www.gnu.org/licenses
JUCE 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.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.juce.com for more information.
==============================================================================
*/
#if JUCE_USE_LAME_AUDIO_FORMAT
class LAMEEncoderAudioFormat::Writer : public AudioFormatWriter
{
public:
Writer (OutputStream* destStream, const String& formatName,
const File& appFile, int vbr, int cbr,
double sampleRate, unsigned int numberOfChannels,
int bitsPerSample, const StringPairArray& metadata)
: AudioFormatWriter (destStream, formatName, sampleRate,
numberOfChannels, (unsigned int) bitsPerSample),
vbrLevel (vbr), cbrBitrate (cbr),
tempWav (".wav")
{
WavAudioFormat wavFormat;
if (FileOutputStream* out = tempWav.getFile().createOutputStream())
{
writer = wavFormat.createWriterFor (out, sampleRate, numChannels,
bitsPerSample, metadata, 0);
args.add (appFile.getFullPathName());
args.add ("--quiet");
if (cbrBitrate == 0)
{
args.add ("--vbr-new");
args.add ("-V");
args.add (String (vbrLevel));
}
else
{
args.add ("--cbr");
args.add ("-b");
args.add (String (cbrBitrate));
}
addMetadataArg (metadata, "id3title", "--tt");
addMetadataArg (metadata, "id3artist", "--ta");
addMetadataArg (metadata, "id3album", "--tl");
addMetadataArg (metadata, "id3comment", "--tc");
addMetadataArg (metadata, "id3date", "--ty");
addMetadataArg (metadata, "id3genre", "--tg");
addMetadataArg (metadata, "id3trackNumber", "--tn");
}
}
void addMetadataArg (const StringPairArray& metadata, const char* key, const char* lameFlag)
{
const String value (metadata.getValue (key, String()));
if (value.isNotEmpty())
{
args.add (lameFlag);
args.add (value);
}
}
~Writer()
{
if (writer != nullptr)
{
writer = nullptr;
if (! convertToMP3())
convertToMP3(); // try again
}
}
bool write (const int** samplesToWrite, int numSamples)
{
return writer != nullptr && writer->write (samplesToWrite, numSamples);
}
private:
int vbrLevel, cbrBitrate;
TemporaryFile tempWav;
ScopedPointer<AudioFormatWriter> writer;
StringArray args;
bool runLameChildProcess (const TemporaryFile& tempMP3, const StringArray& processArgs) const
{
ChildProcess cp;
if (cp.start (processArgs))
{
const String childOutput (cp.readAllProcessOutput());
DBG (childOutput); (void) childOutput;
cp.waitForProcessToFinish (10000);
return tempMP3.getFile().getSize() > 0;
}
return false;
}
bool convertToMP3() const
{
TemporaryFile tempMP3 (".mp3");
StringArray args2 (args);
args2.add (tempWav.getFile().getFullPathName());
args2.add (tempMP3.getFile().getFullPathName());
DBG (args2.joinIntoString (" "));
if (runLameChildProcess (tempMP3, args2))
{
FileInputStream fis (tempMP3.getFile());
if (fis.openedOk() && output->writeFromInputStream (fis, -1) > 0)
{
output->flush();
return true;
}
}
return false;
}
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Writer)
};
//==============================================================================
LAMEEncoderAudioFormat::LAMEEncoderAudioFormat (const File& lameApplication)
: AudioFormat ("MP3 file", ".mp3"),
lameApp (lameApplication)
{
}
LAMEEncoderAudioFormat::~LAMEEncoderAudioFormat()
{
}
bool LAMEEncoderAudioFormat::canHandleFile (const File&)
{
return false;
}
Array<int> LAMEEncoderAudioFormat::getPossibleSampleRates()
{
const int rates[] = { 32000, 44100, 48000, 0 };
return Array<int> (rates);
}
Array<int> LAMEEncoderAudioFormat::getPossibleBitDepths()
{
const int depths[] = { 16, 0 };
return Array<int> (depths);
}
bool LAMEEncoderAudioFormat::canDoStereo() { return true; }
bool LAMEEncoderAudioFormat::canDoMono() { return true; }
bool LAMEEncoderAudioFormat::isCompressed() { return true; }
StringArray LAMEEncoderAudioFormat::getQualityOptions()
{
static const char* vbrOptions[] = { "VBR quality 0 (best)", "VBR quality 1", "VBR quality 2", "VBR quality 3",
"VBR quality 4 (normal)", "VBR quality 5", "VBR quality 6", "VBR quality 7",
"VBR quality 8", "VBR quality 9 (smallest)", nullptr };
StringArray opts (vbrOptions);
const int cbrRates[] = { 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 };
for (int i = 0; i < numElementsInArray (cbrRates); ++i)
opts.add (String (cbrRates[i]) + " Kb/s CBR");
return opts;
}
AudioFormatReader* LAMEEncoderAudioFormat::createReaderFor (InputStream*, const bool)
{
return nullptr;
}
AudioFormatWriter* LAMEEncoderAudioFormat::createWriterFor (OutputStream* streamToWriteTo,
double sampleRateToUse,
unsigned int numberOfChannels,
int bitsPerSample,
const StringPairArray& metadataValues,
int qualityOptionIndex)
{
int vbr = 4;
int cbr = 0;
const String qual (getQualityOptions() [qualityOptionIndex]);
if (qual.contains ("VBR"))
vbr = qual.retainCharacters ("0123456789").getIntValue();
else
cbr = qual.getIntValue();
return new Writer (streamToWriteTo, getFormatName(), lameApp, vbr, cbr,
sampleRateToUse, numberOfChannels, bitsPerSample, metadataValues);
}
#endif
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