Aegisub/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/
//
// $Id$
/// @file audio_renderer_waveform.cpp
/// @ingroup audio_ui
///
/// Render a waveform display of PCM audio data
#include "config.h"
#ifndef AGI_PRE
#include <algorithm>
#include <wx/dcmemory.h>
#endif
#include "block_cache.h"
#include "include/aegisub/audio_provider.h"
#include "audio_colorscheme.h"
#include "audio_renderer.h"
#include "audio_renderer_waveform.h"
#include "colorspace.h"
AudioWaveformRenderer::AudioWaveformRenderer()
: AudioRendererBitmapProvider()
, colors_normal(6, "Icy Blue", AudioStyle_Normal)
, colors_selected(6, "Icy Blue", AudioStyle_Selected)
, colors_inactive(6, "Icy Blue", AudioStyle_Inactive)
, audio_buffer(0)
{
}
AudioWaveformRenderer::~AudioWaveformRenderer()
{
delete[] audio_buffer;
}
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 = GetColorScheme(style);
// 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->GetSampleRate() * provider->GetBytesPerSample();
audio_buffer = new char[buffer_needed];
}
int64_t 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, cur_sample, pixel_samples);
cur_sample += pixel_samples;
int peak_min = 0, peak_max = 0;
int64_t avg_min_accum = 0, avg_max_accum = 0;
const int16_t *aud = (const int16_t *)audio_buffer;
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);
dc.SetPen(pen_avgs);
dc.DrawLine(x, midpoint - avg_max, x, midpoint - avg_min);
}
// Horizontal zero-point line
dc.SetPen(wxPen(pal->get(1.0f)));
dc.DrawLine(0, midpoint, rect.width, midpoint);
}
void AudioWaveformRenderer::RenderBlank(wxDC &dc, const wxRect &rect, AudioRenderingStyle style)
{
const AudioColorScheme *pal = GetColorScheme(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);
}
void AudioWaveformRenderer::OnSetProvider()
{
delete[] audio_buffer;
audio_buffer = 0;
}
void AudioWaveformRenderer::OnSetSamplesPerPixel()
{
delete[] audio_buffer;
audio_buffer = 0;
}
const AudioColorScheme *AudioWaveformRenderer::GetColorScheme(AudioRenderingStyle style) const
{
switch (style)
{
case AudioStyle_Selected: return &colors_selected;
case AudioStyle_Inactive: return &colors_inactive;
default: return &colors_normal;
}
}