multithreaded/SMP motion estimation

multithreaded/SMP encoding for MPEG1/MPEG2/MPEG4/H263
all pthread specific code is in pthread.c
to try it, run configure --enable-pthreads and ffmpeg ... -threads <num>
the internal thread API is a simple AVCodecContext.execute() callback which executes a given function pointer with different arguments and returns after finishing all, that way no mutexes or other thread-mess is needed outside pthread.c

Originally committed as revision 2772 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 22 insertions, 0 deletions

diff --git a/libavcodec/common.h b/libavcodec/common.h
index 729ba4615b..c48f5f1a54 100644
--- a/libavcodec/common.h
+++ b/libavcodec/common.h
@@ -475,6 +475,28 @@ static inline uint8_t* pbBufPtr(PutBitContext *s)
 #endif
 }
 
+/**
+ *
+ * PutBitContext must be flushed & aligned to a byte boundary before calling this.
+ */
+static inline void skip_put_bytes(PutBitContext *s, int n){
+        assert((put_bits_count(s)&7)==0);
+#ifdef ALT_BITSTREAM_WRITER
+        FIXME may need some cleaning of the buffer
+	s->index += n<<3;
+#else
+        assert(s->bit_left==32);
+	s->buf_ptr += n;
+#endif    
+}
+
+/**
+ * Changes the end of the buffer.
+ */
+static inline void set_put_bits_buffer_size(PutBitContext *s, int size){
+    s->buf_end= s->buf + size;
+}
+
 /* Bitstream reader API docs:
 name
     abritary name which is used as prefix for the internal variables