Initial revision

Originally committed as revision 2 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 68 insertions, 0 deletions

diff --git a/libav/common.h b/libav/common.h
new file mode 100644
index 0000000000..18473eb8e8
--- /dev/null
+++ b/libav/common.h
@@ -0,0 +1,68 @@
+#ifndef COMMON_H
+#define COMMON_H
+
+typedef unsigned char UINT8;
+typedef unsigned short UINT16;
+typedef unsigned int UINT32;
+typedef signed char INT8;
+typedef signed short INT16;
+typedef signed int INT32;
+
+/* bit I/O */
+
+struct PutBitContext;
+
+typedef void (*WriteDataFunc)(void *, UINT8 *, int);
+
+typedef struct PutBitContext {
+    UINT8 *buf, *buf_ptr, *buf_end;
+    int bit_cnt;
+    UINT32 bit_buf;
+    long long data_out_size; /* in bytes */
+    void *opaque;
+    WriteDataFunc write_data;
+} PutBitContext;
+
+void init_put_bits(PutBitContext *s, 
+                   UINT8 *buffer, int buffer_size,
+                   void *opaque,
+                   void (*write_data)(void *, UINT8 *, int));
+void put_bits(PutBitContext *s, int n, unsigned int value);
+long long get_bit_count(PutBitContext *s);
+void align_put_bits(PutBitContext *s);
+void flush_put_bits(PutBitContext *s);
+
+/* jpeg specific put_bits */
+void jput_bits(PutBitContext *s, int n, unsigned int value);
+void jflush_put_bits(PutBitContext *s);
+
+/* misc math functions */
+
+extern inline int log2(unsigned int v)
+{
+    int n;
+
+    n = 0;
+    if (v & 0xffff0000) {
+        v >>= 16;
+        n += 16;
+    }
+    if (v & 0xff00) {
+        v >>= 8;
+        n += 8;
+    }
+    if (v & 0xf0) {
+        v >>= 4;
+        n += 4;
+    }
+    if (v & 0xc) {
+        v >>= 2;
+        n += 2;
+    }
+    if (v & 0x2) {
+        n++;
+    }
+    return n;
+}
+
+#endif