g3dvl: Rewrite the mpeg 1&2 bitstream parser

Based on work of Maarten Lankhorst this time.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Younes Manton <younes.m@gmail.com>

src/gallium/include/pipe/p_video_state.h

@@ -43,6 +43,17 @@ struct pipe_video_rect
    unsigned x, y, w, h;
 };
 
+/*
+ * see table 6-12 in the spec
+ */
+enum pipe_mpeg12_picture_coding_type
+{
+   PIPE_MPEG12_PICTURE_CODING_TYPE_I = 0x01,
+   PIPE_MPEG12_PICTURE_CODING_TYPE_P = 0x02,
+   PIPE_MPEG12_PICTURE_CODING_TYPE_B = 0x03,
+   PIPE_MPEG12_PICTURE_CODING_TYPE_D = 0x04
+};
+
 /*
  * see table 6-14 in the spec
  */