Changeset 379 for dsfilters/demux_mpc/src/mpc_pin.cpp

Timestamp:

01/05/08 11:40:24 (16 years ago)

Author:

radscorpion

Message:

SV7 demuxing and decoding works.
However there are strange artifacts when seeking in SV7 files.. - TODO

File:

• dsfilters/demux_mpc/src/mpc_pin.cpp (modified) (1 diff)

dsfilters/demux_mpc/src/mpc_pin.cpp

@@ -638 +638 @@
 }
 
+int CMPCReader::ReadSwapped(void *buf, int size)
+{
+        // this method should only be used to read smaller chunks of data - 
+        // one maximum MPC SV7 frame
+        uint8   temp[16*1024];
+
+        // 32-bit aligned words
+        __int64 cur, av;
+        GetPosition(&cur, &av);
+
+        int preroll = cur & 0x03;
+        __int64 aligned_pos = cur - preroll;
+        int read_size = ((size + preroll) + 0x03) &~ 0x03;              // alignment
+
+        // read the data
+        Seek(aligned_pos);
+        int ret = Read(temp, read_size);
+        if (ret < 0) return ret;
+
+        // swap bytes
+        uint8 *bcur = temp;
+#define SWAP(a,b)       do { uint8 t=(a); (a)=(b); (b)=t; } while (0)
+        while (read_size > 3) {
+                SWAP(bcur[0], bcur[3]);
+                SWAP(bcur[1], bcur[2]);
+                bcur += 4;
+                read_size -= 4;
+        }
+#undef SWAP
+
+        // copy data
+        bcur = temp + preroll;
+        memcpy(buf, bcur, size);
+
+        // advance
+        Seek(cur + size);
+
+        return 0;
+}
+
+
 // reading syntax elements
 int CMPCReader::GetMagick(uint32 &elm)