Aegisub/src/audio_renderer_waveform.cpp

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// Copyright (c) 2010, Niels Martin Hansen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/
#include "audio_renderer_waveform.h"
#include "audio_colorscheme.h"
#include "options.h"
#include <libaegisub/audio/provider.h>
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#include <algorithm>
#include <wx/dcmemory.h>
enum {
/// Only render the peaks
Waveform_MaxOnly = 0,
/// Render the peaks and averages
Waveform_MaxAvg,
Waveform_Continuous
};
AudioWaveformRenderer::AudioWaveformRenderer(std::string const& color_scheme_name)
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: render_averages(OPT_GET("Audio/Display/Waveform Style")->GetInt() == Waveform_MaxAvg)
{
colors.reserve(AudioStyle_MAX);
for (int i = 0; i < AudioStyle_MAX; ++i)
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colors.emplace_back(6, color_scheme_name, i);
}
AudioWaveformRenderer::~AudioWaveformRenderer() { }
void AudioWaveformRenderer::Render(wxBitmap &bmp, int start, AudioRenderingStyle style)
{
wxMemoryDC dc(bmp);
wxRect rect(wxPoint(0, 0), bmp.GetSize());
int midpoint = rect.height / 2;
const AudioColorScheme *pal = &colors[style];
double pixel_samples = pixel_ms * provider->GetSampleRate() / 1000.0;
// Fill the background
dc.SetBrush(wxBrush(pal->get(0.0f)));
dc.SetPen(*wxTRANSPARENT_PEN);
dc.DrawRectangle(rect);
// Make sure we've got a buffer to fill with audio data
if (!audio_buffer)
{
// Buffer for one pixel strip of audio
size_t buffer_needed = pixel_samples * provider->GetChannels() * provider->GetBytesPerSample();
audio_buffer.reset(new char[buffer_needed]);
}
double cur_sample = start * pixel_samples;
assert(provider->GetBytesPerSample() == 2);
assert(provider->GetChannels() == 1);
wxPen pen_peaks(wxPen(pal->get(0.4f)));
wxPen pen_avgs(wxPen(pal->get(0.7f)));
for (int x = 0; x < rect.width; ++x)
{
provider->GetAudio(audio_buffer.get(), (int64_t)cur_sample, (int64_t)pixel_samples);
cur_sample += pixel_samples;
int peak_min = 0, peak_max = 0;
int64_t avg_min_accum = 0, avg_max_accum = 0;
auto aud = reinterpret_cast<const int16_t *>(audio_buffer.get());
for (int si = pixel_samples; si > 0; --si, ++aud)
{
if (*aud > 0)
{
peak_max = std::max(peak_max, (int)*aud);
avg_max_accum += *aud;
}
else
{
peak_min = std::min(peak_min, (int)*aud);
avg_min_accum += *aud;
}
}
// midpoint is half height
peak_min = std::max((int)(peak_min * amplitude_scale * midpoint) / 0x8000, -midpoint);
peak_max = std::min((int)(peak_max * amplitude_scale * midpoint) / 0x8000, midpoint);
int avg_min = std::max((int)(avg_min_accum * amplitude_scale * midpoint / pixel_samples) / 0x8000, -midpoint);
int avg_max = std::min((int)(avg_max_accum * amplitude_scale * midpoint / pixel_samples) / 0x8000, midpoint);
dc.SetPen(pen_peaks);
dc.DrawLine(x, midpoint - peak_max, x, midpoint - peak_min);
if (render_averages) {
dc.SetPen(pen_avgs);
dc.DrawLine(x, midpoint - avg_max, x, midpoint - avg_min);
}
}
// Horizontal zero-point line
if (render_averages)
dc.SetPen(wxPen(pal->get(1.0f)));
else
dc.SetPen(pen_peaks);
dc.DrawLine(0, midpoint, rect.width, midpoint);
}
void AudioWaveformRenderer::RenderBlank(wxDC &dc, const wxRect &rect, AudioRenderingStyle style)
{
const AudioColorScheme *pal = &colors[style];
wxColor line(pal->get(1.0));
wxColor bg(pal->get(0.0));
// Draw the line as background above and below, and line in the middle, to avoid
// overdraw flicker (the common theme in all of audio display direct drawing).
int halfheight = rect.height / 2;
dc.SetBrush(wxBrush(bg));
dc.SetPen(*wxTRANSPARENT_PEN);
dc.DrawRectangle(rect.x, rect.y, rect.width, halfheight);
dc.DrawRectangle(rect.x, rect.y + halfheight + 1, rect.width, rect.height - halfheight - 1);
dc.SetPen(wxPen(line));
dc.DrawLine(rect.x, rect.y+halfheight, rect.x+rect.width, rect.y+halfheight);
}
wxArrayString AudioWaveformRenderer::GetWaveformStyles() {
wxArrayString ret;
ret.push_back(_("Maximum"));
ret.push_back(_("Maximum + Average"));
return ret;
}