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/
//
// $Id$
/// @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_samples(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
SetSamplesPerPixel(1);
SetHeight(1);
}
AudioRenderer::~AudioRenderer()
{
}
void AudioRenderer::SetSamplesPerPixel(int _pixel_samples)
{
if (pixel_samples == _pixel_samples) return;
pixel_samples = _pixel_samples;
if (renderer)
renderer->SetSamplesPerPixel(pixel_samples);
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->SetSamplesPerPixel(pixel_samples);
}
}
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 - 2*cache_bitmap_maxsize;
}
void AudioRenderer::ResetBlockCount()
{
if (provider)
{
size_t rendered_width = (size_t)((provider->GetNumSamples() + pixel_samples - 1) / pixel_samples);
cache_numblocks = rendered_width / cache_bitmap_width;
for_each(bitmaps, bind(&AudioRendererBitmapCache::SetBlockCount, _1, cache_numblocks));
}
}
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);
}
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 = end / cache_bitmap_width;
// How many columns of the last bitmap to use
int lastbitmapoffset = end % cache_bitmap_width;
// Check if we need to render any blank audio past the last bitmap from cache,
// this happens if we're asked to render more audio than the provider has.
if (lastbitmap >= (int)cache_numblocks)
{
lastbitmap = cache_numblocks - 1;
lastbitmapoffset = cache_bitmap_width;
if (firstbitmap > lastbitmap)
firstbitmap = lastbitmap;
}
// Three basic cases now:
// * Either we're just rendering blank audio,
// * Or there is exactly one bitmap to render,
// * Or there is more than one bitmap to render.
// origin is passed by value because we'll be using it as a local var to keep track
// of rendering progress!
if (start / cache_bitmap_width >= (int)cache_numblocks)
{
// Do nothing, the blank audio rendering will happen later
}
else if (firstbitmap == lastbitmap)
{
const int renderwidth = lastbitmapoffset - firstbitmapoffset;
wxBitmap bmp = GetCachedBitmap(firstbitmap, style);
wxMemoryDC bmpdc(bmp);
dc.Blit(origin, wxSize(renderwidth, pixel_height), &bmpdc, wxPoint(firstbitmapoffset, 0));
origin.x += renderwidth;
}
else
{
wxBitmap bmp;
{
bmp = GetCachedBitmap(firstbitmap, style);
// Can't use dc.DrawBitmap here because we need to clip the bitmap
wxMemoryDC bmpdc(bmp);
dc.Blit(origin, wxSize(cache_bitmap_width-firstbitmapoffset, pixel_height),
&bmpdc, wxPoint(firstbitmapoffset, 0));
origin.x += cache_bitmap_width-firstbitmapoffset;
}
for (int i = firstbitmap+1; i < lastbitmap; ++i)
{
bmp = GetCachedBitmap(i, style);
dc.DrawBitmap(bmp, origin);
origin.x += cache_bitmap_width;
}
{
bmp = GetCachedBitmap(lastbitmap, style);
// We also need clipping here
wxMemoryDC bmpdc(bmp);
dc.Blit(origin, wxSize(lastbitmapoffset+1, pixel_height), &bmpdc, wxPoint(0, 0));
origin.x += lastbitmapoffset+1;
}
}
// 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);
}
bitmaps[style].Age(cache_bitmap_maxsize);
renderer->AgeCache(cache_renderer_maxsize);
}
void AudioRenderer::Invalidate()
{
for_each(bitmaps, bind(&AudioRendererBitmapCache::Age, _1, 0));
}
void AudioRendererBitmapProvider::SetProvider(AudioProvider *_provider)
{
if (provider == _provider) return;
provider = _provider;
OnSetProvider();
}
void AudioRendererBitmapProvider::SetSamplesPerPixel(int _pixel_samples)
{
if (pixel_samples == _pixel_samples) return;
pixel_samples = _pixel_samples;
OnSetSamplesPerPixel();
}
void AudioRendererBitmapProvider::SetAmplitudeScale(float _amplitude_scale)
{
if (amplitude_scale == _amplitude_scale) return;
amplitude_scale = _amplitude_scale;
OnSetAmplitudeScale();
}