From f238d1fd97cb605da60bbad619baa215d4569c32 Mon Sep 17 00:00:00 2001
From: tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>
Date: Thu, 25 Nov 2010 11:05:44 +0000
Subject: move /src/plugins/media to src/mediaplugins and /game/plugins/media
 to /game/mediaplugins

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@2753 b956fd51-792f-4845-bead-9b4dfca2ff2c
---
 .../src/mediaplugins/ffmpeg/ffmpeg_audio_convert.h | 133 +++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 mediaplugin/src/mediaplugins/ffmpeg/ffmpeg_audio_convert.h

(limited to 'mediaplugin/src/mediaplugins/ffmpeg/ffmpeg_audio_convert.h')

diff --git a/mediaplugin/src/mediaplugins/ffmpeg/ffmpeg_audio_convert.h b/mediaplugin/src/mediaplugins/ffmpeg/ffmpeg_audio_convert.h
new file mode 100644
index 00000000..ee4c5a81
--- /dev/null
+++ b/mediaplugin/src/mediaplugins/ffmpeg/ffmpeg_audio_convert.h
@@ -0,0 +1,133 @@
+/* UltraStar Deluxe - Karaoke Game
+ *
+ * UltraStar Deluxe is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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
+ * of the License, 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ */
+#ifndef _FFMPEG_AUDIO_CONVERT_H_
+#define _FFMPEG_AUDIO_CONVERT_H_
+
+#include "ffmpeg_core.h"
+#include "core/plugin_audio_convert.h"
+#include <math.h>
+
+extern const audioConverterInfo_t audioConverterInfo;
+
+// Note: FFmpeg seems to be using "kaiser windowed sinc" for resampling, so
+// the quality should be good.
+class FFmpegAudioConvertStream : public AudioConvertStream {
+private:
+	ReSampleContext *_resampleContext;
+	double _ratio;
+
+protected:
+	FFmpegAudioConvertStream(const AudioFormatInfo &srcFormatInfo, const AudioFormatInfo &dstFormatInfo) :
+		AudioConvertStream(srcFormatInfo, dstFormatInfo),
+		_resampleContext(NULL),
+		_ratio(0) {}
+
+	bool init() {
+		// Note: FFmpeg does not support resampling for more than 2 input channels
+
+		if (_srcFormatInfo.getFormat() != asfS16) {
+			logger.error("Unsupported format", "TAudioConverter_FFmpeg.Init");
+			return false;
+		}
+
+		if (_srcFormatInfo.getFormat() != _dstFormatInfo.getFormat()) {
+			logger.error("Incompatible formats", "TAudioConverter_FFmpeg.Init");
+			return false;
+		}
+
+#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52,15,0)
+		// use same values as the deprecated audio_resample_init()
+		const int TAPS = 16;
+		_resampleContext = av_audio_resample_init(
+				_dstFormatInfo.getChannels(),
+				_srcFormatInfo.getChannels(),
+				lround(_dstFormatInfo.getSampleRate()),
+				lround(_srcFormatInfo.getSampleRate()),
+				SAMPLE_FMT_S16, SAMPLE_FMT_S16,
+				TAPS, 10, 0, 0.8);
+#else
+		_resampleContext = audio_resample_init(
+				_dstFormatInfo.getChannels(),
+				_srcFormatInfo.getChannels(),
+				lround(_dstFormatInfo.getSampleRate()),
+				lround(_srcFormatInfo.getSampleRate()));
+#endif
+
+		if (!_resampleContext) {
+			logger.error("audio_resample_init() failed", "TAudioConverter_FFmpeg.Init");
+			return false;
+		}
+
+		// calculate ratio
+		_ratio = ((double)_dstFormatInfo.getChannels() / _srcFormatInfo.getChannels()) *
+		        (_dstFormatInfo.getSampleRate() / _srcFormatInfo.getSampleRate());
+
+		return true;
+	}
+
+public:
+	virtual ~FFmpegAudioConvertStream() {
+		if (_resampleContext)
+			audio_resample_close(_resampleContext);
+	}
+
+	static FFmpegAudioConvertStream* open(const AudioFormatInfo &srcFormatInfo, const AudioFormatInfo &dstFormatInfo) {
+		FFmpegAudioConvertStream *converter = new FFmpegAudioConvertStream(srcFormatInfo, dstFormatInfo);
+		if (!converter->init()) {
+			delete converter;
+			return 0;
+		}
+		return converter;
+	}
+
+	virtual int convert(uint8_t *inputBuffer, uint8_t *outputBuffer, int &inputSize) {
+		if (inputSize <= 0) {
+			// avoid div-by-zero in audio_resample()
+			return (inputSize == 0) ? 0 : -1;
+		}
+
+		int inputSampleCount = inputSize / _srcFormatInfo.getFrameSize();
+		int outputSampleCount = audio_resample(_resampleContext,
+				(short*)outputBuffer, (short*)inputBuffer, inputSampleCount);
+		if (outputSampleCount == -1) {
+			logger.error("audio_resample() failed", "TAudioConverter_FFmpeg.Convert");
+			return -1;
+		}
+		return outputSampleCount * _dstFormatInfo.getFrameSize();
+	}
+
+	/**
+	 * Destination/Source size ratio
+	 */
+	virtual double getRatio() {
+		return _ratio;
+	}
+
+	virtual int getOutputBufferSize(int inputSize) {
+		return ceil(inputSize * getRatio());
+	}
+};
+
+#endif /* _FFMPEG_AUDIO_CONVERT_H_ */
-- 
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