Aegisub/src/audio_renderer.cpp

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// Copyright (c) 2009-2010, 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/
/// @file audio_renderer.cpp
/// @brief Base classes for audio renderers (spectrum, waveform, ...)
/// @ingroup audio_ui
#include "audio_renderer.h"
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#include "include/aegisub/audio_provider.h"
#include <libaegisub/make_unique.h>
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#include <algorithm>
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#include <functional>
#include <wx/bitmap.h>
#include <wx/dcmemory.h>
namespace {
template<typename T>
bool compare_and_set(T &var, T new_value)
{
if (var == new_value) return false;
var = new_value;
return true;
}
}
AudioRendererBitmapCacheBitmapFactory::AudioRendererBitmapCacheBitmapFactory(AudioRenderer *renderer)
: renderer(renderer)
{
assert(renderer);
}
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std::unique_ptr<wxBitmap> AudioRendererBitmapCacheBitmapFactory::ProduceBlock(int /* i */)
{
return agi::make_unique<wxBitmap>(renderer->cache_bitmap_width, renderer->pixel_height, 24);
}
size_t AudioRendererBitmapCacheBitmapFactory::GetBlockSize() const
{
return sizeof(wxBitmap) + renderer->cache_bitmap_width * renderer->pixel_height * 3;
}
AudioRenderer::AudioRenderer()
{
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for (int i = 0; i < AudioStyle_MAX; ++i)
bitmaps.emplace_back(256, AudioRendererBitmapCacheBitmapFactory(this));
// Make sure there's *some* values for those fields, and in the caches
SetMillisecondsPerPixel(1);
SetHeight(1);
}
void AudioRenderer::SetMillisecondsPerPixel(double new_pixel_ms)
{
if (compare_and_set(pixel_ms, new_pixel_ms))
{
if (renderer)
renderer->SetMillisecondsPerPixel(pixel_ms);
ResetBlockCount();
}
}
void AudioRenderer::SetHeight(int _pixel_height)
{
if (compare_and_set(pixel_height, _pixel_height))
Invalidate();
}
void AudioRenderer::SetAmplitudeScale(float _amplitude_scale)
{
if (compare_and_set(amplitude_scale, _amplitude_scale))
{
// A scaling of 0 or a negative scaling makes no sense
assert(amplitude_scale > 0);
if (renderer)
renderer->SetAmplitudeScale(amplitude_scale);
Invalidate();
}
}
void AudioRenderer::SetRenderer(AudioRendererBitmapProvider *_renderer)
{
if (compare_and_set(renderer, _renderer))
{
Invalidate();
if (renderer)
{
renderer->SetProvider(provider);
renderer->SetAmplitudeScale(amplitude_scale);
renderer->SetMillisecondsPerPixel(pixel_ms);
}
}
}
void AudioRenderer::SetAudioProvider(AudioProvider *_provider)
{
if (compare_and_set(provider, _provider))
{
Invalidate();
if (renderer)
renderer->SetProvider(provider);
ResetBlockCount();
}
}
void AudioRenderer::SetCacheMaxSize(size_t max_size)
{
// Limit the bitmap cache sizes to 16 MB hard, to avoid the risk of exhausting
// system bitmap object resources and similar. Experimenting shows that 16 MB
// bitmap cache should be plenty even if working with a one hour audio clip.
cache_bitmap_maxsize = std::min<size_t>(max_size/8, 0x1000000);
// The renderer gets whatever is left.
cache_renderer_maxsize = max_size - 4*cache_bitmap_maxsize;
}
void AudioRenderer::ResetBlockCount()
{
if (provider)
{
const size_t total_blocks = NumBlocks(provider->GetNumSamples());
for (auto& bmp : bitmaps) bmp.SetBlockCount(total_blocks);
}
}
size_t AudioRenderer::NumBlocks(const int64_t samples) const
{
const double duration = samples * 1000.0 / provider->GetSampleRate();
return static_cast<size_t>(duration / pixel_ms / cache_bitmap_width);
}
const wxBitmap *AudioRenderer::GetCachedBitmap(int i, AudioRenderingStyle style)
{
assert(provider);
assert(renderer);
bool created = false;
wxBitmap *bmp = bitmaps[style].Get(i, &created);
assert(bmp);
if (created)
{
renderer->Render(*bmp, i*cache_bitmap_width, style);
needs_age = true;
}
assert(bmp->IsOk());
return bmp;
}
void AudioRenderer::Render(wxDC &dc, wxPoint origin, int start, int length, AudioRenderingStyle style)
{
assert(start >= 0);
if (!provider) return;
if (!renderer) return;
if (length <= 0) return;
// One past last absolute pixel strip to render
int end = start + length;
// One past last X coordinate to render on
int lastx = origin.x + length;
// Figure out which range of bitmaps are required
int firstbitmap = start / cache_bitmap_width;
// And the offset in it to start its use at
int firstbitmapoffset = start % cache_bitmap_width;
// The last bitmap required
int lastbitmap = std::min<int>(end / cache_bitmap_width, NumBlocks(provider->GetDecodedSamples()) - 1);
// Set a clipping region so that the first and last bitmaps don't draw
// outside the requested range
wxDCClipper clipper(dc, wxRect(origin, wxSize(length, pixel_height)));
origin.x -= firstbitmapoffset;
for (int i = firstbitmap; i <= lastbitmap; ++i)
{
dc.DrawBitmap(*GetCachedBitmap(i, style), origin);
origin.x += cache_bitmap_width;
}
// Now render blank audio from origin to end
if (origin.x < lastx)
renderer->RenderBlank(dc, wxRect(origin.x-1, origin.y, lastx-origin.x+1, pixel_height), style);
if (needs_age)
{
bitmaps[style].Age(cache_bitmap_maxsize);
renderer->AgeCache(cache_renderer_maxsize);
needs_age = false;
}
}
void AudioRenderer::Invalidate()
{
for (auto& bmp : bitmaps) bmp.Age(0);
needs_age = false;
}
void AudioRendererBitmapProvider::SetProvider(AudioProvider *_provider)
{
if (compare_and_set(provider, _provider))
OnSetProvider();
}
void AudioRendererBitmapProvider::SetMillisecondsPerPixel(double new_pixel_ms)
{
if (compare_and_set(pixel_ms, new_pixel_ms))
OnSetMillisecondsPerPixel();
}
void AudioRendererBitmapProvider::SetAmplitudeScale(float _amplitude_scale)
{
if (compare_and_set(amplitude_scale, _amplitude_scale))
OnSetAmplitudeScale();
}