improve filterRecordData
[enigma2.git] / lib / base / filepush.cpp
index 76e01ea..7f85eac 100644 (file)
@@ -6,13 +6,16 @@
 
 #define PVR_COMMIT 1
 
 
 #define PVR_COMMIT 1
 
-eFilePushThread::eFilePushThread(int io_prio_class, int io_prio_level)
+FILE *f = fopen("/log.ts", "wb");
+
+eFilePushThread::eFilePushThread(int io_prio_class, int io_prio_level, int blocksize)
        :prio_class(io_prio_class), prio(io_prio_level), m_messagepump(eApp, 0)
 {
        m_stop = 0;
        m_sg = 0;
        m_send_pvr_commit = 0;
        m_stream_mode = 0;
        :prio_class(io_prio_class), prio(io_prio_level), m_messagepump(eApp, 0)
 {
        m_stop = 0;
        m_sg = 0;
        m_send_pvr_commit = 0;
        m_stream_mode = 0;
+       m_blocksize = blocksize;
        flush();
        enablePVRCommit(0);
        CONNECT(m_messagepump.recv_msg, eFilePushThread::recvEvent);
        flush();
        enablePVRCommit(0);
        CONNECT(m_messagepump.recv_msg, eFilePushThread::recvEvent);
@@ -53,9 +56,56 @@ void eFilePushThread::thread()
                        /* first try flushing the bufptr */
                if (m_buf_start != m_buf_end)
                {
                        /* first try flushing the bufptr */
                if (m_buf_start != m_buf_end)
                {
-                               // TODO: take care of boundaries.
-                       filterRecordData(m_buffer + m_buf_start, m_buf_end - m_buf_start);
+                               /* filterRecordData wants to work on multiples of blocksize.
+                                  if it returns a negative result, it means that this many bytes should be skipped
+                                  *in front* of the buffer. Then, it will be called again. with the newer, shorter buffer.
+                                  if filterRecordData wants to skip more data then currently available, it must do that internally.
+                                  Skipped bytes will also not be output.
+
+                                  if it returns a positive result, that means that only these many bytes should be used
+                                  in the buffer. 
+                                  
+                                  In either case, current_span_remaining is given as a reference and can be modified. (Of course it 
+                                  doesn't make sense to decrement it to a non-zero value unless you return 0 because that would just
+                                  skip some data). This is probably a very special application for fast-forward, where the current
+                                  span is to be cancelled after a complete iframe has been output.
+
+                                  we always call filterRecordData with our full buffer (otherwise we couldn't easily strip from the end)
+                                  
+                                  we filter data only once, of course, but it might not get immediately written.
+                                  that's what m_filter_end is for - it points to the start of the unfiltered data.
+                               */
+                       
+                       int filter_res;
+                       
+                       do
+                       {
+                               filter_res = filterRecordData(m_buffer + m_filter_end, m_buf_end - m_filter_end, current_span_remaining);
+
+                               if (filter_res < 0)
+                               {
+                                       eDebug("[eFilePushThread] filterRecordData re-syncs and skips %d bytes", -filter_res);
+                                       m_buf_start = m_filter_end + -filter_res;  /* this will also drop unwritten data */
+                                       ASSERT(m_buf_start <= m_buf_end); /* otherwise filterRecordData skipped more data than available. */
+                                       continue; /* try again */
+                               }
+                               
+                                       /* adjust end of buffer to strip dropped tail bytes */
+                               m_buf_end = m_filter_end + filter_res;
+                                       /* mark data as filtered. */
+                               m_filter_end = m_buf_end;
+                       } while (0);
+                       
+                       ASSERT(m_filter_end == m_buf_end);
+                       
+                       if (m_buf_start == m_buf_end)
+                               continue;
+
+                               /* now write out data. it will be 'aligned' (according to filterRecordData). 
+                                  absolutely forbidden is to return EINTR and consume a non-aligned number of bytes. 
+                               */
                        int w = write(m_fd_dest, m_buffer + m_buf_start, m_buf_end - m_buf_start);
                        int w = write(m_fd_dest, m_buffer + m_buf_start, m_buf_end - m_buf_start);
+                       fwrite(m_buffer + m_buf_start, 1, m_buf_end - m_buf_start, f);
 //                     eDebug("wrote %d bytes", w);
                        if (w <= 0)
                        {
 //                     eDebug("wrote %d bytes", w);
                        if (w <= 0)
                        {
@@ -89,6 +139,7 @@ void eFilePushThread::thread()
                if (m_sg && !current_span_remaining)
                {
                        m_sg->getNextSourceSpan(source_pos, bytes_read, current_span_offset, current_span_remaining);
                if (m_sg && !current_span_remaining)
                {
                        m_sg->getNextSourceSpan(source_pos, bytes_read, current_span_offset, current_span_remaining);
+                       ASSERT(!(current_span_remaining % m_blocksize));
 
                        if (source_pos != current_span_offset)
                                source_pos = m_raw_source.lseek(current_span_offset, SEEK_SET);
 
                        if (source_pos != current_span_offset)
                                source_pos = m_raw_source.lseek(current_span_offset, SEEK_SET);
@@ -101,7 +152,11 @@ void eFilePushThread::thread()
                if (m_sg && maxread > current_span_remaining)
                        maxread = current_span_remaining;
 
                if (m_sg && maxread > current_span_remaining)
                        maxread = current_span_remaining;
 
+                       /* align to blocksize */
+               maxread -= maxread % m_blocksize;
+
                m_buf_start = 0;
                m_buf_start = 0;
+               m_filter_end = 0;
                m_buf_end = 0;
                
                if (maxread)
                m_buf_end = 0;
                
                if (maxread)
@@ -222,7 +277,7 @@ void eFilePushThread::resume()
 
 void eFilePushThread::flush()
 {
 
 void eFilePushThread::flush()
 {
-       m_buf_start = m_buf_end = 0;
+       m_buf_start = m_buf_end = m_filter_end = 0;
 }
 
 void eFilePushThread::enablePVRCommit(int s)
 }
 
 void eFilePushThread::enablePVRCommit(int s)
@@ -250,8 +305,7 @@ void eFilePushThread::recvEvent(const int &evt)
        m_event(evt);
 }
 
        m_event(evt);
 }
 
-void eFilePushThread::filterRecordData(const unsigned char *data, int len)
+int eFilePushThread::filterRecordData(const unsigned char *data, int len, size_t &current_span_remaining)
 {
 {
-       /* do nothing */
+       return len;
 }
 }
-