108 lines
4.5 KiB
C++
108 lines
4.5 KiB
C++
// Copyright (c) 2005, 2006, Rodrigo Braz Monteiro
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// Copyright (c) 2006, 2007, Niels Martin Hansen
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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//
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// $Id$
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/// @file audio_renderer_spectrum.h
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/// @see audio_renderer_spectrum.cpp
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/// @ingroup audio_ui
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///
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/// Calculate and render a frequency-power spectrum for PCM audio data.
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#ifndef AGI_PRE
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#include <stdint.h>
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#endif
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#include "audio_provider_manager.h"
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// Specified and implemented in cpp file, interface is private to spectrum code
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class AudioSpectrumCacheManager;
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/// @class AudioSpectrum
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/// @brief Render frequency-power spectrum graphs for audio data.
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///
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/// Renders frequency-power spectrum graphs of PCM audio data using a fast fourier transform
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/// to derive the data. The frequency-power data are cached to avoid re-computing them
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/// frequently, and the cache size is limited by a configuration setting.
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///
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/// The spectrum image is rendered to a 32 bit RGB bitmap. Power data is scaled linearly
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/// and not logarithmically, since the rendering is done with limited precision, but
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/// an amplification factor can be specified to see different ranges.
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class AudioSpectrum {
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private:
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/// Internal cache management for the spectrum
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AudioSpectrumCacheManager *cache;
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/// Colour table used for regular rendering
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unsigned char colours_normal[256*3];
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/// Colour table used for rendering the audio selection
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unsigned char colours_selected[256*3];
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/// The audio provider to use as source
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AudioProvider *provider;
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unsigned long line_length; ///< Number of frequency components per line (half of number of samples)
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unsigned long num_lines; ///< Number of lines needed for the audio
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unsigned int fft_overlaps; ///< Number of overlaps used in FFT
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float power_scale; ///< Amplification of displayed power
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int minband; ///< Smallest frequency band displayed
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int maxband; ///< Largest frequency band displayed
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public:
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/// @brief Constructor
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/// @param _provider Audio provider to render spectrum data for.
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///
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/// Reads configuration data for the spectrum display and initialises itself following that.
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AudioSpectrum(AudioProvider *_provider);
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/// @brief Destructor
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~AudioSpectrum();
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/// @brief Render a range of audio spectrum to a bitmap buffer.
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/// @param range_start First audio sample in the range to render.
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/// @param range_end Last audio sample in the range to render.
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/// @param selected Use the alternate colour palette?
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/// @param img Pointer to 32 bit RGBX data
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/// @param imgleft Offset from left edge of bitmap to render to, in pixels
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/// @param imgwidth Width of bitmap to render, in pixels
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/// @param imgpitch Offset from one scanline to the next in the bitmap, in bytes
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/// @param imgheight Number of lines in the bitmap
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void RenderRange(int64_t range_start, int64_t range_end, bool selected, unsigned char *img, int imgleft, int imgwidth, int imgpitch, int imgheight);
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/// @brief Set the amplification to use when rendering.
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/// @param _power_scale Amplification factor to use.
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void SetScaling(float _power_scale);
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};
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