libcore/Video.cpp

   1 // Video.cpp:  Draw individual video frames, for Gnash.
   2 //
   3 //   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Free Software
   4 //   Foundation, Inc
   5 //
   6 // This program is free software; you can redistribute it and/or modify
   7 // it under the terms of the GNU General Public License as published by
   8 // the Free Software Foundation; either version 3 of the License, or
   9 // (at your option) any later version.
  10 //
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License
  17 // along with this program; if not, write to the Free Software
  18 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 //
  20
  21 #include "Video.h"
  22
  23 #include <boost/bind.hpp>
  24 #include <cassert>
  25
  26 #include "MovieClip.h"
  27 #include "DefineVideoStreamTag.h"
  28 #include "fn_call.h"
  29 #include "as_value.h"
  30 #include "NetStream_as.h"
  31 #include "NativeFunction.h"
  32 #include "movie_root.h"
  33 #include "VM.h"
  34 #include "MediaHandler.h" // for setting up embedded video decoder
  35 #include "VideoDecoder.h" // for setting up embedded video decoder
  36 #include "namedStrings.h"
  37 #include "Global_as.h"
  38 #include "Renderer.h"
  39 #include "RunResources.h"
  40 #include "Transform.h"
  41
  42 // Define this to get debug logging during embedded video decoding
  43 //#define DEBUG_EMBEDDED_VIDEO_DECODING
  44
  45 namespace gnash {
  46
  47 namespace {
  48     void attachPrototypeProperties(as_object& o);
  49     void attachVideoInterface(as_object& o);
  50     as_value video_ctor(const fn_call& fn);
  51     as_value video_attach(const fn_call& fn);
  52     as_value video_clear(const fn_call& fn);
  53     as_value video_deblocking(const fn_call& fn);
  54     as_value video_smoothing(const fn_call& fn);
  55     as_value video_width(const fn_call& fn);
  56     as_value video_height(const fn_call& fn);
  57 }
  58
  59 Video::Video(as_object* object,
  60         const SWF::DefineVideoStreamTag* def, DisplayObject* parent)
  61         :
  62         DisplayObject(getRoot(*object), object, parent),
  63         m_def(def),
  64         _ns(0),
  65         _embeddedStream(m_def),
  66         _lastDecodedVideoFrameNum(-1),
  67         _lastDecodedVideoFrame(),
  68     _smoothing(false)
  69 {
  70     assert(object);
  71     assert(def);
  72
  73     media::MediaHandler* mh = getRunResources(*object).mediaHandler();
  74         if (!mh) {
  75                 LOG_ONCE( log_error(_("No Media handler registered, "
  76                         "won't be able to decode embedded video")) );
  77                 return;
  78         }
  79
  80         media::VideoInfo* info = m_def->getVideoInfo();
  81         if (!info) return;
  82
  83     try {
  84             _decoder = mh->createVideoDecoder(*info);
  85         }
  86         catch (const MediaException& e) {
  87             log_error("Could not create Video Decoder: %s", e.what());
  88         }
  89 }
  90
  91 Video::~Video()
  92 {
  93 }
  94
  95 int
  96 Video::width() const
  97 {
  98     if (_ns) return _ns->videoWidth();
  99     return 0;
 100 }
 101
 102 int
 103 Video::height() const
 104 {
 105     if (_ns) return _ns->videoHeight();
 106     return 0;
 107 }
 108
 109 void
 110 Video::clear()
 111 {
 112     // Clear the current image only if paused.
 113     if (_ns && _ns->playbackState() == PlayHead::PLAY_PAUSED)
 114     {
 115         set_invalidated();
 116         _lastDecodedVideoFrame.reset();
 117     }
 118 }
 119
 120 void
 121 Video::display(Renderer& renderer, const Transform& base)
 122 {
 123         assert(m_def);
 124
 125     const DisplayObject::MaskRenderer mr(renderer, *this);
 126
 127     const Transform xform = base * transform();
 128         const SWFRect& bounds = m_def->bounds();
 129
 130     image::GnashImage* img = getVideoFrame();
 131         if (img) {
 132                 renderer.drawVideoFrame(img, xform, &bounds, _smoothing);
 133         }
 134
 135         clear_invalidated();
 136 }
 137
 138 image::GnashImage*
 139 Video::getVideoFrame()
 140 {
 141         // If this is a video from a NetStream_as object, retrieve a video
 142     // frame from there.
 143         if (_ns) {
 144                 std::auto_ptr<image::GnashImage> tmp = _ns->get_video();
 145                 if (tmp.get()) _lastDecodedVideoFrame = tmp;
 146         }
 147
 148         // If this is a video from a VideoFrame tag, retrieve a video frame
 149     // from there.
 150         else if (_embeddedStream) {
 151
 152         // Don't try to do anything if there is no decoder. If it was
 153         // never constructed (most likely), we'll return nothing,
 154         // otherwise the last decoded frame.
 155         if (!_decoder.get()) {
 156                     LOG_ONCE(log_error(_("No Video info in video definition")));
 157             return _lastDecodedVideoFrame.get();
 158         }
 159
 160         const boost::uint16_t current_frame = get_ratio();
 161
 162 #ifdef DEBUG_EMBEDDED_VIDEO_DECODING
 163                 log_debug("Video instance %s need display video frame (ratio) %d",
 164                         getTarget(), current_frame);
 165 #endif
 166
 167                 // If current frame is the same then last decoded
 168                 // we don't need to decode more
 169                 if (_lastDecodedVideoFrameNum >= 0 &&
 170                 _lastDecodedVideoFrameNum == current_frame) {
 171 #ifdef DEBUG_EMBEDDED_VIDEO_DECODING
 172                         log_debug("  current frame == _lastDecodedVideoFrameNum (%d)",
 173                     current_frame);
 174 #endif
 175                         return _lastDecodedVideoFrame.get();
 176                 }
 177
 178         // TODO: find a better way than using -1 to show that no
 179         // frames have been decoded yet.
 180         assert(_lastDecodedVideoFrameNum >= -1);
 181         boost::uint16_t from_frame = _lastDecodedVideoFrameNum + 1;
 182
 183                 // If current frame is smaller then last decoded frame
 184                 // we restart decoding from scratch
 185                 if (current_frame < static_cast<size_t>(_lastDecodedVideoFrameNum)) {
 186 #ifdef DEBUG_EMBEDDED_VIDEO_DECODING
 187                         log_debug("  current frame (%d) < _lastDecodedVideoFrameNum (%d)",
 188                     current_frame, _lastDecodedVideoFrameNum);
 189 #endif
 190                         from_frame = 0;
 191                 }
 192
 193                 // Reset last decoded video frame number now, so it's correct
 194                 // on early return (ie: nothing more to decode)
 195                 _lastDecodedVideoFrameNum = current_frame;
 196
 197 #ifdef DEBUG_EMBEDDED_VIDEO_DECODING
 198                 log_debug("  decoding embedded frames from %d to %d for Video "
 199                 "object %s", from_frame, current_frame, getTarget());
 200 #endif
 201
 202         const size_t frames = m_def->visitSlice(
 203                 boost::bind(boost::mem_fn(&media::VideoDecoder::push),
 204                     _decoder.get(), _1),
 205                 from_frame, current_frame);
 206
 207         if (!frames) return _lastDecodedVideoFrame.get();
 208
 209                 _lastDecodedVideoFrame = _decoder->pop();
 210         }
 211
 212         return _lastDecodedVideoFrame.get();
 213 }
 214
 215 void
 216 Video::construct(as_object* /*init*/)
 217 {
 218     // For soft references.
 219     saveOriginalTarget();
 220 }
 221
 222
 223 void
 224 Video::add_invalidated_bounds(InvalidatedRanges& ranges, bool force)
 225 {
 226         if (!force && !invalidated()) return; // no need to redraw
 227
 228         ranges.add(m_old_invalidated_ranges);
 229
 230         assert(m_def);
 231
 232         SWFRect bounds;
 233         bounds.expand_to_transformed_rect(getWorldMatrix(*this), m_def->bounds());
 234
 235         ranges.add(bounds.getRange());
 236 }
 237
 238 void
 239 Video::setStream(NetStream_as* ns)
 240 {
 241         _ns = ns;
 242         _ns->setInvalidatedVideo(this);
 243 }
 244
 245 // extern (used by Global.cpp)
 246 void
 247 video_class_init(as_object& global, const ObjectURI& uri)
 248 {
 249         // This is going to be the global Video "class"/"function"
 250     Global_as& gl = getGlobal(global);
 251     as_object* proto = createObject(gl);
 252     as_object* cl = gl.createClass(&video_ctor, proto);
 253     attachVideoInterface(*proto);
 254
 255         // Register _global.Video
 256         global.init_member(uri, cl, as_object::DefaultFlags);
 257 }
 258
 259 void
 260 registerVideoNative(as_object& global)
 261 {
 262     VM& vm = getVM(global);
 263     vm.registerNative(video_ctor, 667, 0);
 264     vm.registerNative(video_attach, 667, 1);
 265     vm.registerNative(video_clear, 667, 2);
 266 }
 267
 268 SWFRect
 269 Video::getBounds() const
 270 {
 271         if (_embeddedStream) return m_def->bounds();
 272
 273         // TODO: return the bounds of the dynamically
 274         //       loaded video if not embedded ?
 275         return SWFRect();
 276 }
 277
 278 void
 279 Video::markOwnResources() const
 280 {
 281         if (_ns) _ns->setReachable();
 282 }
 283
 284 as_object*
 285 createVideoObject(Global_as& gl)
 286 {
 287     // TODO: how to use this for AS3 as well?
 288     // Turn into constructBuiltin()
 289     as_object* obj = getObjectWithPrototype(gl, NSV::CLASS_VIDEO);
 290     as_object* proto = obj->get_prototype();
 291     if (proto) attachPrototypeProperties(*proto);
 292     return obj;
 293 }
 294
 295 namespace {
 296
 297 void
 298 attachVideoInterface(as_object& o)
 299 {
 300     VM& vm = getVM(o);
 301         o.init_member("attachVideo", vm.getNative(667, 1));
 302         o.init_member("clear", vm.getNative(667, 2));
 303 }
 304
 305 void
 306 attachPrototypeProperties(as_object& proto)
 307 {
 308     const int protect = PropFlags::dontDelete;
 309
 310     proto.init_property("deblocking", &video_deblocking, &video_deblocking,
 311             protect);
 312     proto.init_property("smoothing", &video_smoothing, &video_smoothing,
 313             protect);
 314
 315     const int flags = PropFlags::dontDelete |
 316         PropFlags::readOnly;
 317
 318     proto.init_property("height", &video_height, &video_height, flags);
 319     proto.init_property("width", &video_width, &video_width, flags);
 320 }
 321
 322 as_value
 323 video_attach(const fn_call& fn)
 324 {
 325         Video* video = ensure<IsDisplayObject<Video> >(fn);
 326
 327         if (fn.nargs < 1)
 328         {
 329                 IF_VERBOSE_ASCODING_ERRORS(
 330                 log_aserror(_("attachVideo needs 1 arg"));
 331                 );
 332                 return as_value();
 333         }
 334
 335     as_object* obj = toObject(fn.arg(0), getVM(fn));
 336         NetStream_as* ns;
 337
 338     if (isNativeType(obj, ns)) {
 339                 video->setStream(ns);
 340         }
 341         else {
 342                 IF_VERBOSE_ASCODING_ERRORS(
 343                 log_aserror(_("attachVideo(%s) first arg is not a NetStream instance"),
 344                         fn.arg(0));
 345                 );
 346         }
 347         return as_value();
 348 }
 349
 350 as_value
 351 video_deblocking(const fn_call& fn)
 352 {
 353         Video* video = ensure<IsDisplayObject<Video> >(fn);
 354     UNUSED(video);
 355
 356     log_unimpl("Video.deblocking");
 357     return as_value();
 358 }
 359
 360 as_value
 361 video_smoothing(const fn_call& fn)
 362 {
 363         Video* video = ensure<IsDisplayObject<Video> >(fn);
 364
 365     if (!fn.nargs) return as_value(video->smoothing());
 366
 367     const bool smooth = toBool(fn.arg(0), getVM(fn));
 368     video->setSmoothing(smooth);
 369
 370     return as_value();
 371 }
 372
 373 as_value
 374 video_width(const fn_call& fn)
 375 {
 376         Video* video = ensure<IsDisplayObject<Video> >(fn);
 377     return as_value(video->width());
 378 }
 379
 380 as_value
 381 video_height(const fn_call& fn)
 382 {
 383         Video* video = ensure<IsDisplayObject<Video> >(fn);
 384     return as_value(video->height());
 385 }
 386
 387 as_value
 388 video_clear(const fn_call& fn)
 389 {
 390         Video* video = ensure<IsDisplayObject<Video> >(fn);
 391
 392     video->clear();
 393     return as_value();
 394 }
 395
 396 as_value
 397 video_ctor(const fn_call& /* fn */)
 398 {
 399         return as_value();
 400 }
 401
 402 } // anonymous namespace
 403
 404 } // end of namespace gnash
 405
 406
 407