253 lines
7 KiB
C++
253 lines
7 KiB
C++
// Copyright (c) 2006-2007, Rodrigo Braz Monteiro, Evgeniy Stepanov
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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//
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// $Id$
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/// @file subtitles_provider_libass.cpp
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/// @brief libass-based subtitle renderer
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/// @ingroup subtitle_rendering
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///
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#include "config.h"
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#ifdef WITH_LIBASS
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#ifndef AGI_PRE
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#include <wx/filefn.h>
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#include <wx/utils.h>
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#endif
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#ifdef __APPLE__
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#include <sys/param.h>
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#include <libaegisub/util_osx.h>
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#endif
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#include <libaegisub/log.h>
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#include "ass_file.h"
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#include "dialog_progress.h"
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#include "frame_main.h"
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#include "main.h"
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#include "standard_paths.h"
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#include "subtitles_provider_libass.h"
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#include "utils.h"
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#include "video_context.h"
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#include "video_frame.h"
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/// @brief Handle libass messages
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///
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static void msg_callback(int level, const char *fmt, va_list args, void *) {
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if (level >= 7) return;
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char buf[1024];
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#ifdef _WIN32
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vsprintf_s(buf, sizeof(buf), fmt, args);
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#else
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vsnprintf(buf, sizeof(buf), fmt, args);
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#endif
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if (level < 2) // warning/error
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LOG_I("subtitle/provider/libass") << buf;
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else // verbose
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LOG_D("subtitle/provider/libass") << buf;
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}
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class FontConfigCacheThread : public wxThread {
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ASS_Library *ass_library;
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ASS_Renderer *ass_renderer;
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FontConfigCacheThread** thisPtr;
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ExitCode Entry() {
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#ifdef __APPLE__
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char config_path[MAXPATHLEN];
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char *config_dir;
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config_dir = agi::util::OSX_GetBundleResourcesDirectory();
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snprintf(config_path, MAXPATHLEN, "%s/etc/fonts/fonts.conf", config_dir);
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free(config_dir);
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#else
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const char *config_path = NULL;
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#endif
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if (ass_library) ass_renderer = ass_renderer_init(ass_library);
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ass_set_fonts(ass_renderer, NULL, "Sans", 1, config_path, true);
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if (ass_library) ass_renderer_done(ass_renderer);
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*thisPtr = NULL;
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return EXIT_SUCCESS;
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}
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public:
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FontConfigCacheThread(ASS_Library *ass_library, FontConfigCacheThread **thisPtr)
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: ass_library(ass_library)
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, ass_renderer(NULL)
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, thisPtr(thisPtr)
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{
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*thisPtr = this;
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Create();
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Run();
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}
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FontConfigCacheThread(ASS_Renderer *ass_renderer, FontConfigCacheThread **thisPtr)
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: ass_library(NULL)
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, ass_renderer(ass_renderer)
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, thisPtr(thisPtr)
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{
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*thisPtr = this;
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Create();
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Run();
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}
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};
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static void wait_for_cache_thread(FontConfigCacheThread const * const * const cache_worker) {
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if (!*cache_worker) return;
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bool canceled;
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DialogProgress *progress = new DialogProgress(AegisubApp::Get()->frame, L"", &canceled, L"Caching fonts", 0, 1);
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progress->Show();
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while (*cache_worker) {
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if (canceled) throw agi::UserCancelException("Font caching cancelled");
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progress->Pulse();
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wxYield();
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wxMilliSleep(100);
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}
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progress->Destroy();
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}
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/// @brief Constructor
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///
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LibassSubtitlesProvider::LibassSubtitlesProvider(std::string) {
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wait_for_cache_thread(&cache_worker);
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// Initialize renderer
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ass_track = NULL;
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ass_renderer = ass_renderer_init(ass_library);
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if (!ass_renderer) throw _T("ass_renderer_init failed");
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ass_set_font_scale(ass_renderer, 1.);
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new FontConfigCacheThread(ass_renderer, &cache_worker);
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wait_for_cache_thread(&cache_worker);
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}
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/// @brief Destructor
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///
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LibassSubtitlesProvider::~LibassSubtitlesProvider() {
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if (ass_track) ass_free_track(ass_track);
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if (ass_renderer) ass_renderer_done(ass_renderer);
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}
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/// @brief Load subtitles
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/// @param subs
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///
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void LibassSubtitlesProvider::LoadSubtitles(AssFile *subs) {
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// Prepare subtitles
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std::vector<char> data;
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subs->SaveMemory(data,_T("UTF-8"));
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// Load file
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if (ass_track) ass_free_track(ass_track);
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ass_track = ass_read_memory(ass_library, &data[0], data.size(),(char *)"UTF-8");
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if (!ass_track) throw _T("libass failed to load subtitles.");
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}
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/// DOCME
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#define _r(c) ((c)>>24)
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/// DOCME
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#define _g(c) (((c)>>16)&0xFF)
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/// DOCME
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#define _b(c) (((c)>>8)&0xFF)
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/// DOCME
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#define _a(c) ((c)&0xFF)
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/// @brief Draw subtitles
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/// @param frame
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/// @param time
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/// @return
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///
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void LibassSubtitlesProvider::DrawSubtitles(AegiVideoFrame &frame,double time) {
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// Set size
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ass_set_frame_size(ass_renderer, frame.w, frame.h);
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// Get frame
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ASS_Image* img = ass_render_frame(ass_renderer, ass_track, int(time * 1000), NULL);
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// libass actually returns several alpha-masked monochrome images.
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// Here, we loop through their linked list, get the colour of the current, and blend into the frame.
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// This is repeated for all of them.
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while (img) {
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// Get colours
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unsigned int opacity = 255 - ((unsigned int)_a(img->color));
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unsigned int r = (unsigned int)_r(img->color);
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unsigned int g = (unsigned int)_g(img->color);
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unsigned int b = (unsigned int) _b(img->color);
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// Prepare copy
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int src_stride = img->stride;
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int dst_stride = frame.pitch;
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int dst_delta = dst_stride - img->w*4;
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//int stride = std::min(src_stride,dst_stride);
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const unsigned char *src = img->bitmap;
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unsigned char *dst = frame.data + (img->dst_y * dst_stride + img->dst_x * 4);
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unsigned int k,ck,t;
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// Copy image to destination frame
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for (int y=0;y<img->h;y++) {
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//memcpy(dst,src,stride);
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for (int x = 0; x < img->w; ++x) {
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k = ((unsigned)src[x]) * opacity / 255;
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ck = 255 - k;
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t = *dst;
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*dst++ = (k*b + ck*t) / 255;
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t = *dst;
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*dst++ = (k*g + ck*t) / 255;
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t = *dst;
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*dst++ = (k*r + ck*t) / 255;
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dst++;
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}
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dst += dst_delta;
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src += src_stride;
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}
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// Next image
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img = img->next;
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}
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}
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void LibassSubtitlesProvider::CacheFonts() {
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ass_library = ass_library_init();
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ass_set_message_cb(ass_library, msg_callback, NULL);
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new FontConfigCacheThread(ass_library, &cache_worker);
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}
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/// DOCME
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ASS_Library* LibassSubtitlesProvider::ass_library;
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FontConfigCacheThread* LibassSubtitlesProvider::cache_worker = NULL;
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#endif // WITH_LIBASS
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