return -1;
}
int i = MAX_RETRY + pos - curr_pos;
+ int64_t cache_start = 0;
while( ret>=0 && !flushed && curr_pos<=pos && --i>=0 ) {
ret = read_frame(frame);
if( ret > 0 ) {
if( frame->key_frame && seeking < 0 ) {
- seeking = 1;
- ffmpeg->purge_cache();
- }
- if( ffmpeg->get_use_cache() && seeking > 0 && curr_pos < pos ) {
- VFrame *cache_frame = ffmpeg->new_cache_frame(vframe, curr_pos);
- if( cache_frame ) {
- ret = convert_cmodel(cache_frame, frame);
- ffmpeg->put_cache_frame();
+ int use_cache = ffmpeg->get_use_cache();
+ if( use_cache < 0 ) {
+// for reverse read, reload file frame_cache from keyframe to pos
+ ffmpeg->purge_cache();
+ int count = preferences->cache_size /
+ vframe->get_data_size() / 2; // try to burn only 1/2 of cache
+ cache_start = pos - count + 1;
+ seeking = 1;
}
+ else
+ seeking = 0;
+ }
+ if( seeking > 0 && curr_pos >= cache_start && curr_pos < pos ) {
+ int vw =vframe->get_w(), vh = vframe->get_h();
+ int vcolor_model = vframe->get_color_model();
+// do not use shm here, puts too much pressure on 32bit systems
+ VFrame *cache_frame = new VFrame(vw, vh, vcolor_model, 0);
+ ret = convert_cmodel(cache_frame, frame);
+ if( ret > 0 )
+ ffmpeg->put_cache_frame(cache_frame, curr_pos);
}
++curr_pos;
}
return ret;
}
-VFrame *FFMPEG::new_cache_frame(VFrame *vframe, int64_t position)
-{
- return file_base->file->new_cache_frame(vframe, position, 0);
-}
-
-void FFMPEG::put_cache_frame()
+void FFMPEG::put_cache_frame(VFrame *frame, int64_t position)
{
- return file_base->file->put_cache_frame();
+ file_base->file->put_cache_frame(frame, position, 0);
}
int FFMPEG::get_use_cache()