Aegisub/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
// Headers
#include "config.h"
#include "audio_renderer.h"
#ifndef AGI_PRE
#include <algorithm>
#include <tr1/functional>
#include <wx/bitmap.h>
#include <wx/dcmemory.h>
#endif
#include "include/aegisub/audio_provider.h"
template<class C, class F> static void for_each(C &container, F const& func)
{
std::for_each(container.begin(), container.end(), func);
}
using std::tr1::placeholders::_1;
AudioRendererBitmapCacheBitmapFactory::AudioRendererBitmapCacheBitmapFactory(AudioRenderer *renderer)
: renderer(renderer)
{
assert(renderer);
}
wxBitmap *AudioRendererBitmapCacheBitmapFactory::ProduceBlock(int /* i */)
{
return new wxBitmap(renderer->cache_bitmap_width, renderer->pixel_height, 24);
}
void AudioRendererBitmapCacheBitmapFactory::DisposeBlock(wxBitmap *bmp)
{
delete bmp;
}
size_t AudioRendererBitmapCacheBitmapFactory::GetBlockSize() const
{
return sizeof(wxBitmap) + renderer->cache_bitmap_width * renderer->pixel_height * 3;
}
AudioRenderer::AudioRenderer()
: pixel_ms(0)
, pixel_height(0)
, amplitude_scale(0)
, cache_bitmap_width(32) // arbitrary value for now
, cache_bitmap_maxsize(0)
, cache_renderer_maxsize(0)
, renderer(0)
, provider(0)
{
bitmaps.resize(AudioStyle_MAX, AudioRendererBitmapCache(256, AudioRendererBitmapCacheBitmapFactory(this)));
// Make sure there's *some* values for those fields, and in the caches
SetMillisecondsPerPixel(1);
SetHeight(1);
}
AudioRenderer::~AudioRenderer()
{
}
void AudioRenderer::SetMillisecondsPerPixel(double new_pixel_ms)
{
if (pixel_ms == new_pixel_ms) return;
pixel_ms = new_pixel_ms;
if (renderer)
renderer->SetMillisecondsPerPixel(pixel_ms);
ResetBlockCount();
}
void AudioRenderer::SetHeight(int _pixel_height)
{
if (pixel_height == _pixel_height) return;
pixel_height = _pixel_height;
Invalidate();
}
void AudioRenderer::SetAmplitudeScale(float _amplitude_scale)
{
if (amplitude_scale == _amplitude_scale) return;
// A scaling of 0 or a negative scaling makes no sense
assert(_amplitude_scale > 0);
amplitude_scale = _amplitude_scale;
if (renderer)
renderer->SetAmplitudeScale(amplitude_scale);
Invalidate();
}
void AudioRenderer::SetRenderer(AudioRendererBitmapProvider *_renderer)
{
if (renderer == _renderer) return;
renderer = _renderer;
Invalidate();
if (renderer)
{
renderer->SetProvider(provider);
renderer->SetAmplitudeScale(amplitude_scale);
renderer->SetMillisecondsPerPixel(pixel_ms);
}
}
void AudioRenderer::SetAudioProvider(AudioProvider *_provider)
{
if (provider == _provider) return;
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)
{
double duration = provider->GetNumSamples() * 1000.0 / provider->GetSampleRate();
size_t rendered_width = (size_t)ceil(duration / pixel_ms);
cache_numblocks = rendered_width / cache_bitmap_width;
for_each(bitmaps, bind(&AudioRendererBitmapCache::SetBlockCount, _1, cache_numblocks));
}
}
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, cache_numblocks - 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_each(bitmaps, bind(&AudioRendererBitmapCache::Age, _1, 0));
needs_age = false;
}
void AudioRendererBitmapProvider::SetProvider(AudioProvider *_provider)
{
if (provider == _provider) return;
provider = _provider;
OnSetProvider();
}
void AudioRendererBitmapProvider::SetMillisecondsPerPixel(double new_pixel_ms)
{
if (pixel_ms == new_pixel_ms) return;
pixel_ms = new_pixel_ms;
OnSetMillisecondsPerPixel();
}
void AudioRendererBitmapProvider::SetAmplitudeScale(float _amplitude_scale)
{
if (amplitude_scale == _amplitude_scale) return;
amplitude_scale = _amplitude_scale;
OnSetAmplitudeScale();
}