Aegisub/aegisub/src/subtitles_provider_libass.cpp

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// Copyright (c) 2006-2007, Rodrigo Braz Monteiro, Evgeniy Stepanov
// 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 subtitles_provider_libass.cpp
/// @brief libass-based subtitle renderer
/// @ingroup subtitle_rendering
///
#include "config.h"
#ifdef WITH_LIBASS
#ifndef AGI_PRE
#include <wx/filefn.h>
#include <wx/utils.h>
#endif
#ifdef __APPLE__
#include <sys/param.h>
#include <libaegisub/util_osx.h>
#endif
#include <libaegisub/log.h>
#include "ass_file.h"
#include "dialog_progress.h"
#include "frame_main.h"
#include "main.h"
#include "standard_paths.h"
#include "subtitles_provider_libass.h"
#include "utils.h"
#include "video_context.h"
#include "video_frame.h"
/// @brief Handle libass messages
///
static void msg_callback(int level, const char *fmt, va_list args, void *) {
if (level >= 7) return;
char buf[1024];
#ifdef _WIN32
vsprintf_s(buf, sizeof(buf), fmt, args);
#else
vsnprintf(buf, sizeof(buf), fmt, args);
#endif
if (level < 2) // warning/error
LOG_I("subtitle/provider/libass") << buf;
else // verbose
LOG_D("subtitle/provider/libass") << buf;
}
class FontConfigCacheThread : public wxThread {
ASS_Library *ass_library;
ASS_Renderer *ass_renderer;
FontConfigCacheThread** thisPtr;
ExitCode Entry() {
#ifdef __APPLE__
char config_path[MAXPATHLEN];
char *config_dir;
config_dir = agi::util::OSX_GetBundleResourcesDirectory();
snprintf(config_path, MAXPATHLEN, "%s/etc/fonts/fonts.conf", config_dir);
free(config_dir);
#else
const char *config_path = NULL;
#endif
if (ass_library) ass_renderer = ass_renderer_init(ass_library);
ass_set_fonts(ass_renderer, NULL, "Sans", 1, config_path, true);
if (ass_library) ass_renderer_done(ass_renderer);
*thisPtr = NULL;
return EXIT_SUCCESS;
}
public:
FontConfigCacheThread(ASS_Library *ass_library, FontConfigCacheThread **thisPtr)
: ass_library(ass_library)
, ass_renderer(NULL)
, thisPtr(thisPtr)
{
*thisPtr = this;
Create();
Run();
}
FontConfigCacheThread(ASS_Renderer *ass_renderer, FontConfigCacheThread **thisPtr)
: ass_library(NULL)
, ass_renderer(ass_renderer)
, thisPtr(thisPtr)
{
*thisPtr = this;
Create();
Run();
}
};
static void do_wait(agi::ProgressSink *ps, FontConfigCacheThread const * const * const cache_worker) {
ps->SetIndeterminate();
while (*cache_worker && !ps->IsCancelled())
wxMilliSleep(100);
}
static void wait_for_cache_thread(FontConfigCacheThread const * const * const cache_worker) {
if (!*cache_worker) return;
DialogProgress progress(wxGetApp().frame, "Updating font index", "This may take several minutes");
progress.Run(bind(do_wait, std::tr1::placeholders::_1, cache_worker));
}
/// @brief Constructor
///
LibassSubtitlesProvider::LibassSubtitlesProvider(std::string) {
wait_for_cache_thread(&cache_worker);
// Initialize renderer
ass_track = NULL;
ass_renderer = ass_renderer_init(ass_library);
if (!ass_renderer) throw "ass_renderer_init failed";
ass_set_font_scale(ass_renderer, 1.);
new FontConfigCacheThread(ass_renderer, &cache_worker);
wait_for_cache_thread(&cache_worker);
}
/// @brief Destructor
///
LibassSubtitlesProvider::~LibassSubtitlesProvider() {
if (ass_track) ass_free_track(ass_track);
if (ass_renderer) ass_renderer_done(ass_renderer);
}
/// @brief Load subtitles
/// @param subs
///
void LibassSubtitlesProvider::LoadSubtitles(AssFile *subs) {
// Prepare subtitles
std::vector<char> data;
subs->SaveMemory(data);
// Load file
if (ass_track) ass_free_track(ass_track);
ass_track = ass_read_memory(ass_library, &data[0], data.size(),(char *)"UTF-8");
if (!ass_track) throw "libass failed to load subtitles.";
}
/// DOCME
#define _r(c) ((c)>>24)
/// DOCME
#define _g(c) (((c)>>16)&0xFF)
/// DOCME
#define _b(c) (((c)>>8)&0xFF)
/// DOCME
#define _a(c) ((c)&0xFF)
/// @brief Draw subtitles
/// @param frame
/// @param time
/// @return
///
void LibassSubtitlesProvider::DrawSubtitles(AegiVideoFrame &frame,double time) {
// Set size
ass_set_frame_size(ass_renderer, frame.w, frame.h);
// Get frame
ASS_Image* img = ass_render_frame(ass_renderer, ass_track, int(time * 1000), NULL);
// libass actually returns several alpha-masked monochrome images.
// Here, we loop through their linked list, get the colour of the current, and blend into the frame.
// This is repeated for all of them.
while (img) {
// Get colours
unsigned int opacity = 255 - ((unsigned int)_a(img->color));
unsigned int r = (unsigned int)_r(img->color);
unsigned int g = (unsigned int)_g(img->color);
unsigned int b = (unsigned int) _b(img->color);
// Prepare copy
int src_stride = img->stride;
int dst_stride = frame.pitch;
const unsigned char *src = img->bitmap;
unsigned char *dst = frame.data;
if (frame.flipped) {
dst += dst_stride * (frame.h - 1);
dst_stride *= -1;
}
dst += (img->dst_y * dst_stride + img->dst_x * 4);
// Copy image to destination frame
for (int y = 0; y < img->h; y++) {
unsigned char *dstp = dst;
for (int x = 0; x < img->w; ++x) {
unsigned int k = ((unsigned)src[x]) * opacity / 255;
unsigned int ck = 255 - k;
*dstp = (k * b + ck * *dstp) / 255;
++dstp;
*dstp = (k * g + ck * *dstp) / 255;
++dstp;
*dstp = (k * r + ck * *dstp) / 255;
++dstp;
++dstp;
}
dst += dst_stride;
src += src_stride;
}
// Next image
img = img->next;
}
}
void LibassSubtitlesProvider::CacheFonts() {
ass_library = ass_library_init();
ass_set_message_cb(ass_library, msg_callback, NULL);
new FontConfigCacheThread(ass_library, &cache_worker);
}
/// DOCME
ASS_Library* LibassSubtitlesProvider::ass_library;
FontConfigCacheThread* LibassSubtitlesProvider::cache_worker = NULL;
#endif // WITH_LIBASS