void VideoStream::drop_one_frame()
{
ASSERT(MAX_VIDEO_FRAMES > 2 && (_frames_head - _frames_tail) == MAX_VIDEO_FRAMES);
int frame_index = _frames_head - _kill_mark++ % (MAX_VIDEO_FRAMES - 2) - 2;
free_frame(frame_index);
while (frame_index != _frames_tail) {
--frame_index;
_frames[frame_slot(frame_index + 1)] = _frames[frame_slot(frame_index)];
}
_frames_tail++;
}
uint32_t VideoStream::alloc_frame_slot()
{
if ((_frames_head - _frames_tail) == MAX_VIDEO_FRAMES) {
drop_one_frame();
}
return frame_slot(_frames_head++);
}
void VideoStream::maintenance()
{
uint32_t mm_time = _client.get_mm_time();
remove_dead_frames(mm_time);
if (!_update_mark && !_update_time && _frames_head != _frames_tail) {
VideoFrame* tail = &_frames[frame_slot(_frames_tail)];
ASSERT(tail->compressed_data);
uint8_t* data = tail->compressed_data;
uint32_t length = tail->compressed_data_size;
int got_picture = 0;
got_picture =_mjpeg_decoder->decode_data(data, length);
if (got_picture) {
#ifdef WIN32
_canvas.put_image(_dc, _pixmap, _dest, _clip);
#else
_canvas.put_image(_pixmap, _dest, _clip);
#endif
if (is_time_to_display(mm_time, tail->mm_time)) {
_update_mark = _channel.invalidate(_dest, true);
Platform::yield();
} else {
_update_time = tail->mm_time;
_channel.stream_update_request(_update_time);
}
}
free_frame(_frames_tail++);
}
}
void as_environment::add_local ( const tu_string &varname, const as_value &val )
// Add a local var with the given name and value to our
// current local frame. Use this when you know the var
// doesn't exist yet, since it's faster than set_local();
// e.g. when setting up args for a function.
{
assert ( varname.length() > 0 );
m_local_frames.push_back ( frame_slot ( varname, val ) );
}
void VideoStream::remove_dead_frames(uint32_t mm_time)
{
while (_frames_head != _frames_tail) {
if (int(_frames[frame_slot(_frames_tail)].mm_time - mm_time) >= MAX_UNDER) {
return;
}
free_frame(_frames_tail);
_frames_tail++;
}
}
void VideoStream::free_frame(uint32_t frame_index)
{
int slot = frame_slot(frame_index);
delete[] _frames[slot].compressed_data;
_frames[slot].compressed_data = NULL;
}