use VLCs for in place of get_fragment_run_length(), get_mode_code(), and

get_motion_vector_vlc()

Originally committed as revision 4266 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vp3.c

@@ -15,17 +15,17 @@
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
- * VP3 Video Decoder by Mike Melanson (melanson@pcisys.net)
- * For more information about the VP3 coding process, visit:
- *   http://www.pcisys.net/~melanson/codecs/
- *
- * Theora decoder by Alex Beregszaszi
- *
  */
 
 /**
  * @file vp3.c
  * On2 VP3 Video Decoder
+ *
+ * VP3 Video Decoder by Mike Melanson (mike at multimedia.cx)
+ * For more information about the VP3 coding process, visit:
+ *   http://multimedia.cx/
+ *
+ * Theora decoder by Alex Beregszaszi
  */
 
 #include <stdio.h>
@@ -271,6 +271,11 @@ typedef struct Vp3DecodeContext {
     VLC ac_vlc_3[16];
     VLC ac_vlc_4[16];
 
+    VLC superblock_run_length_vlc;
+    VLC fragment_run_length_vlc;
+    VLC mode_code_vlc;
+    VLC motion_vector_vlc;
+
     /* these arrays need to be on 16-byte boundaries since SSE2 operations
      * index into them */
     int16_t __align16 intra_y_dequant[64];
@@ -1274,7 +1279,12 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
                      * that cares about the fragment coding runs */
                     if (current_run == 0) {
                         bit ^= 1;
+#if 1
+                        current_run = get_vlc2(gb, 
+                            s->fragment_run_length_vlc.table, 5, 2) + 1;
+#else
                         current_run = get_fragment_run_length(gb);
+#endif
                     }
 
                     if (bit) {
@@ -1404,7 +1414,14 @@ static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
                 if (scheme == 7)
                     coding_mode = get_bits(gb, 3);
                 else
+{
+#if 1
+                    coding_mode = ModeAlphabet[scheme]
+                        [get_vlc2(gb, s->mode_code_vlc.table, 3, 3)];
+#else
                     coding_mode = ModeAlphabet[scheme][get_mode_code(gb)];
+#endif
+}
 
                 s->macroblock_coding[current_macroblock] = coding_mode;
                 for (k = 0; k < 6; k++) {
@@ -1491,8 +1508,13 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
                 case MODE_GOLDEN_MV:
                     /* all 6 fragments use the same motion vector */
                     if (coding_mode == 0) {
+#if 1
+                        motion_x[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
+                        motion_y[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
+#else
                         motion_x[0] = get_motion_vector_vlc(gb);
                         motion_y[0] = get_motion_vector_vlc(gb);
+#endif
                     } else {
                         motion_x[0] = get_motion_vector_fixed(gb);
                         motion_y[0] = get_motion_vector_fixed(gb);
@@ -1518,8 +1540,13 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
                     motion_x[4] = motion_y[4] = 0;
                     for (k = 0; k < 4; k++) {
                         if (coding_mode == 0) {
+#if 1
+                            motion_x[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
+                            motion_y[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
+#else
                             motion_x[k] = get_motion_vector_vlc(gb);
                             motion_y[k] = get_motion_vector_vlc(gb);
+#endif
                         } else {
                             motion_x[k] = get_motion_vector_fixed(gb);
                             motion_y[k] = get_motion_vector_fixed(gb);
@@ -2496,13 +2523,8 @@ static int vp3_decode_init(AVCodecContext *avctx)
 	s->version = 1;
 
     s->avctx = avctx;
-#if 0
-    s->width = avctx->width;
-    s->height = avctx->height;
-#else
     s->width = (avctx->width + 15) & 0xFFFFFFF0;
     s->height = (avctx->height + 15) & 0xFFFFFFF0;
-#endif
     avctx->pix_fmt = PIX_FMT_YUV420P;
     avctx->has_b_frames = 0;
     if(avctx->idct_algo==FF_IDCT_AUTO)
@@ -2608,6 +2630,18 @@ static int vp3_decode_init(AVCodecContext *avctx)
             &ac_bias_3[i][0][0], 4, 2, 0);
     }
 
+    init_vlc(&s->fragment_run_length_vlc, 5, 31,
+        &fragment_run_length_vlc_table[0][1], 4, 2,
+        &fragment_run_length_vlc_table[0][0], 4, 2, 0);
+
+    init_vlc(&s->mode_code_vlc, 3, 8,
+        &mode_code_vlc_table[0][1], 2, 1,
+        &mode_code_vlc_table[0][0], 2, 1, 0);
+
+    init_vlc(&s->motion_vector_vlc, 6, 63,
+        &motion_vector_vlc_table[0][1], 2, 1,
+        &motion_vector_vlc_table[0][0], 2, 1, 0);
+
     /* work out the block mapping tables */
     s->superblock_fragments = av_malloc(s->superblock_count * 16 * sizeof(int));
     s->superblock_macroblocks = av_malloc(s->superblock_count * 4 * sizeof(int));

libavcodec/vp3data.h

@@ -72,6 +72,76 @@ static const uint32_t vp31_filter_limit_values[64] =
     0,  0,  0,  0,  0,  0,  0,  0
 };
 
+static const uint16_t fragment_run_length_vlc_table[30][2] = {
+    /* 1 -> 2 */
+    { 0x0, 2 },    { 0x1, 2 },
+
+    /* 3 -> 4 */
+    { 0x4, 3 },    { 0x5, 3 },
+
+    /* 5 -> 6 */
+    { 0xC, 4 },    { 0xD, 4 },
+
+    /* 7 -> 10 */
+    { 0x38, 6 },   { 0x39, 6 },
+    { 0x3A, 6 },   { 0x3B, 6 },
+
+    /* 11 -> 14 */
+    { 0x78, 7 },   { 0x79, 7 },
+    { 0x7A, 7 },   { 0x7B, 7 },
+
+    /* 15 -> 30 */
+    { 0x1F0, 9 },  { 0x1F1, 9 },  { 0x1F2, 9 },  { 0x1F3, 9 },
+    { 0x1F4, 9 },  { 0x1F5, 9 },  { 0x1F6, 9 },  { 0x1F7, 9 },
+    { 0x1F8, 9 },  { 0x1F9, 9 },  { 0x1FA, 9 },  { 0x1FB, 9 },
+    { 0x1FC, 9 },  { 0x1FD, 9 },  { 0x1FE, 9 },  { 0x1FF, 9 }
+};
+
+static const uint8_t mode_code_vlc_table[30][2] = {
+    { 0, 1 },      { 2, 2 },
+    { 6, 3 },      { 14, 4 },
+    { 30, 5 },     { 62, 6 },
+    { 126, 7 },    { 127, 7 }
+};
+
+static const uint8_t motion_vector_vlc_table[63][2] = {
+    { 0, 3 },
+    { 1, 3 },
+    { 2, 3 },
+    
+    { 6, 4 },    { 7, 4 },
+
+    { 8, 4 },    { 9, 4 },
+
+    { 40, 6 },    { 41, 6 },    { 42, 6 },    { 43, 6 },
+    { 44, 6 },    { 45, 6 },    { 46, 6 },    { 47, 6 },
+
+    { 96, 7 },    { 97, 7 },    { 98, 7 },    { 99, 7 },
+    { 100, 7 },   { 101, 7 },   { 102, 7 },   { 103, 7 },
+    { 104, 7 },   { 105, 7 },   { 106, 7 },   { 107, 7 },
+    { 108, 7 },   { 109, 7 },   { 110, 7 },   { 111, 7 },
+
+    { 0xE0, 8 },  { 0xE1, 8 },  { 0xE2, 8 },  { 0xE3, 8 },
+    { 0xE4, 8 },  { 0xE5, 8 },  { 0xE6, 8 },  { 0xE7, 8 },
+    { 0xE8, 8 },  { 0xE9, 8 },  { 0xEA, 8 },  { 0xEB, 8 },
+    { 0xEC, 8 },  { 0xED, 8 },  { 0xEE, 8 },  { 0xEF, 8 },
+
+    { 0xF0, 8 },  { 0xF1, 8 },  { 0xF2, 8 },  { 0xF3, 8 },
+    { 0xF4, 8 },  { 0xF5, 8 },  { 0xF6, 8 },  { 0xF7, 8 },
+    { 0xF8, 8 },  { 0xF9, 8 },  { 0xFA, 8 },  { 0xFB, 8 },
+    { 0xFC, 8 },  { 0xFD, 8 },  { 0xFE, 8 },  { 0xFF, 8 }
+};
+
+static const int motion_vector_table[63] = {
+    0, 1, -1,
+    2, -2,
+    3, -3,
+    4, -4, 5, -5, 6, -6, 7, -7,
+    8, -8, 9, -9, 10, -10, 11, -11, 12, -12, 13, -13, 14, -14, 15, -15,
+    16, -16, 17, -17, 18, -18, 19, -19, 20, -20, 21, -21, 22, -22, 23, -23,
+    24, -24, 25, -25, 26, -26, 27, -27, 28, -28, 29, -29, 30, -30, 31, -31
+};
+
 static const uint16_t dc_bias[16][32][2] = {
   {  /* DC bias table 0 */
     { 0x2D, 6 },