Add non-mpg123 MP3 decoder.

src/modules/sound/lullaby/MP3Decoder.cpp

@@ -0,0 +1,144 @@
+/**
+ * Copyright (c) 2006-2020 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#define DR_MP3_IMPLEMENTATION
+#define DR_MP3_NO_STDIO
+#include "MP3Decoder.h"
+
+namespace love
+{
+namespace sound
+{
+namespace lullaby
+{
+
+MP3Decoder::MP3Decoder(Data *data, int bufferSize)
+: Decoder(data, bufferSize)
+{
+	// initialize mp3 handle
+	if(drmp3_init_memory(&mp3, data->getData(), data->getSize(), nullptr, nullptr) == 0)
+		throw love::Exception("Could not read mp3 data.");
+
+	sampleRate = mp3.sampleRate;
+
+	// calculate duration
+	drmp3_uint64 pcmCount, mp3FrameCount;
+	if (!drmp3_get_mp3_and_pcm_frame_count(&mp3, &mp3FrameCount, &pcmCount))
+	{
+		drmp3_uninit(&mp3);
+		throw love::Exception("Could not calculate duration.");
+	}
+	duration = ((double) pcmCount) / ((double) mp3.sampleRate);
+
+	// create seek table
+	uint32_t mp3FrameInt = mp3FrameCount;
+	seekTable.resize(mp3FrameCount, {0ULL, 0ULL, 0, 0});
+	if (!drmp3_calculate_seek_points(&mp3, &mp3FrameInt, seekTable.data()))
+	{
+		drmp3_uninit(&mp3);
+		throw love::Exception("Could not calculate seek table");
+	}
+	mp3FrameInt = mp3FrameInt > mp3FrameCount ? mp3FrameCount : mp3FrameInt;
+
+	// bind seek table
+	if (!drmp3_bind_seek_table(&mp3, mp3FrameInt, seekTable.data()))
+	{
+		drmp3_uninit(&mp3);
+		throw love::Exception("Could not bind seek table");
+	}
+}
+
+MP3Decoder::~MP3Decoder()
+{
+	drmp3_uninit(&mp3);
+}
+
+bool MP3Decoder::accepts(const std::string &ext)
+{
+	static const std::string supported[] =
+	{
+		"mp3", ""
+	};
+
+	for (int i = 0; !(supported[i].empty()); i++)
+	{
+		if (supported[i].compare(ext) == 0)
+			return true;
+	}
+
+	return false;
+}
+
+love::sound::Decoder *MP3Decoder::clone()
+{
+	return new MP3Decoder(data, bufferSize);
+}
+
+int MP3Decoder::decode()
+{
+	// bufferSize is in char
+	int maxRead = bufferSize / sizeof(int16_t) / mp3.channels;
+	int read = (int) drmp3_read_pcm_frames_s16(&mp3, maxRead, (drmp3_int16 *) buffer);
+
+	if (read < maxRead)
+		eof = true;
+
+	return read * sizeof(int16_t) * mp3.channels;
+}
+
+bool MP3Decoder::seek(double s)
+{
+	drmp3_uint64 targetSample = s * mp3.sampleRate;
+	drmp3_bool32 success = drmp3_seek_to_pcm_frame(&mp3, targetSample);
+
+	if (success)
+		eof = false;
+
+	return success;
+}
+
+bool MP3Decoder::rewind()
+{
+	return seek(0.0);
+}
+
+bool MP3Decoder::isSeekable()
+{
+	return true;
+}
+
+int MP3Decoder::getChannelCount() const
+{
+	return mp3.channels;
+}
+
+int MP3Decoder::getBitDepth() const
+{
+	return 16;
+}
+
+double MP3Decoder::getDuration()
+{
+	return duration;
+}
+
+} // lullaby
+} // sound
+} // love

src/modules/sound/lullaby/MP3Decoder.h

@@ -0,0 +1,71 @@
+/**
+ * Copyright (c) 2006-2020 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#ifndef LOVE_SOUND_LULLABY_MP3_DECODER_H
+#define LOVE_SOUND_LULLABY_MP3_DECODER_H
+
+// LOVE
+#include "common/Data.h"
+#include "sound/Decoder.h"
+
+// dr_mp3
+#include "dr/dr_mp3.h"
+
+#include <vector>
+
+namespace love
+{
+namespace sound
+{
+namespace lullaby
+{
+
+class MP3Decoder: public love::sound::Decoder
+{
+public:
+
+	MP3Decoder(Data *data, int bufsize);
+	virtual ~MP3Decoder();
+
+	static bool accepts(const std::string &ext);
+	love::sound::Decoder *clone();
+	int decode();
+	bool seek(double s);
+	bool rewind();
+	bool isSeekable();
+	int getChannelCount() const;
+	int getBitDepth() const;
+	double getDuration();
+
+private:
+
+	// MP3 handle
+	drmp3 mp3;
+	// Used for fast seeking
+	std::vector<drmp3_seek_point> seekTable;
+
+	double duration;
+}; // MP3Decoder
+
+} // lullaby
+} // sound
+} // love
+
+#endif