Split the mpeg4 encoder and decoder off h263.c

Originally committed as revision 21079 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 197 insertions, 0 deletions

diff --git a/libavcodec/mpeg4video.h b/libavcodec/mpeg4video.h
new file mode 100644
index 0000000000..b5abceaef2
--- /dev/null
+++ b/libavcodec/mpeg4video.h
@@ -0,0 +1,197 @@
+/*
+ * MPEG4 encoder/decoder internal header.
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_MPEG4VIDEO_H
+#define AVCODEC_MPEG4VIDEO_H
+
+// shapes
+#define RECT_SHAPE       0
+#define BIN_SHAPE        1
+#define BIN_ONLY_SHAPE   2
+#define GRAY_SHAPE       3
+
+#define SIMPLE_VO_TYPE             1
+#define CORE_VO_TYPE               3
+#define MAIN_VO_TYPE               4
+#define NBIT_VO_TYPE               5
+#define ARTS_VO_TYPE               10
+#define ACE_VO_TYPE                12
+#define ADV_SIMPLE_VO_TYPE         17
+
+// aspect_ratio_info
+#define EXTENDED_PAR 15
+
+//vol_sprite_usage / sprite_enable
+#define STATIC_SPRITE 1
+#define GMC_SPRITE 2
+
+#define MOTION_MARKER 0x1F001
+#define DC_MARKER     0x6B001
+
+#define VOS_STARTCODE        0x1B0
+#define USER_DATA_STARTCODE  0x1B2
+#define GOP_STARTCODE        0x1B3
+#define VISUAL_OBJ_STARTCODE 0x1B5
+#define VOP_STARTCODE        0x1B6
+
+/* dc encoding for mpeg4 */
+extern const uint8_t DCtab_lum[13][2];
+extern const uint8_t DCtab_chrom[13][2];
+
+extern const uint16_t intra_vlc[103][2];
+extern const int8_t intra_level[102];
+extern const int8_t intra_run[102];
+extern RLTable rl_intra;
+
+/* Note this is identical to the intra rvlc except that it is reordered. */
+extern const uint16_t inter_rvlc[170][2];
+extern const int8_t inter_rvlc_run[169];
+extern const int8_t inter_rvlc_level[169];
+extern RLTable rvlc_rl_inter;
+
+extern const uint16_t intra_rvlc[170][2];
+extern const int8_t intra_rvlc_run[169];
+extern const int8_t intra_rvlc_level[169];
+extern RLTable rvlc_rl_intra;
+
+extern const uint16_t sprite_trajectory_tab[15][2];
+extern const uint8_t mb_type_b_tab[4][2];
+extern const AVRational pixel_aspect[16];
+
+/* these matrixes will be permuted for the idct */
+extern const int16_t ff_mpeg4_default_intra_matrix[64];
+extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
+
+extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
+extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
+extern const uint16_t ff_mpeg4_resync_prefix[8];
+
+extern const uint8_t mpeg4_dc_threshold[8];
+
+void mpeg4_encode_mb(MpegEncContext *s,
+                    DCTELEM block[6][64],
+                    int motion_x, int motion_y);
+void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
+                   int dir);
+void ff_set_mpeg4_time(MpegEncContext * s);
+void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
+
+int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb);
+void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
+void ff_mpeg4_clean_buffers(MpegEncContext *s);
+void ff_mpeg4_stuffing(PutBitContext * pbc);
+void ff_mpeg4_init_partitions(MpegEncContext *s);
+void ff_mpeg4_merge_partitions(MpegEncContext *s);
+void ff_clean_mpeg4_qscales(MpegEncContext *s);
+int ff_mpeg4_decode_partitions(MpegEncContext *s);
+int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
+int mpeg4_decode_video_packet_header(MpegEncContext *s);
+
+extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
+
+
+#if 0 //3IV1 is quite rare and it slows things down a tiny bit
+#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
+#else
+#define IS_3IV1 0
+#endif
+
+
+/**
+ * predicts the dc.
+ * encoding quantized level -> quantized diff
+ * decoding quantized diff -> quantized level
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ * @param dir_ptr pointer to an integer where the prediction direction will be stored
+ */
+static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, int level, int *dir_ptr, int encoding)
+{
+    int a, b, c, wrap, pred, scale, ret;
+    int16_t *dc_val;
+
+    /* find prediction */
+    if (n < 4) {
+        scale = s->y_dc_scale;
+    } else {
+        scale = s->c_dc_scale;
+    }
+    if(IS_3IV1)
+        scale= 8;
+
+    wrap= s->block_wrap[n];
+    dc_val = s->dc_val[0] + s->block_index[n];
+
+    /* B C
+     * A X
+     */
+    a = dc_val[ - 1];
+    b = dc_val[ - 1 - wrap];
+    c = dc_val[ - wrap];
+
+    /* outside slice handling (we can't do that by memset as we need the dc for error resilience) */
+    if(s->first_slice_line && n!=3){
+        if(n!=2) b=c= 1024;
+        if(n!=1 && s->mb_x == s->resync_mb_x) b=a= 1024;
+    }
+    if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1){
+        if(n==0 || n==4 || n==5)
+            b=1024;
+    }
+
+    if (abs(a - b) < abs(b - c)) {
+        pred = c;
+        *dir_ptr = 1; /* top */
+    } else {
+        pred = a;
+        *dir_ptr = 0; /* left */
+    }
+    /* we assume pred is positive */
+    pred = FASTDIV((pred + (scale >> 1)), scale);
+
+    if(encoding){
+        ret = level - pred;
+    }else{
+        level += pred;
+        ret= level;
+        if(s->error_recognition>=3){
+            if(level<0){
+                av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
+                return -1;
+            }
+            if(level*scale > 2048 + scale){
+                av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
+                return -1;
+            }
+        }
+    }
+    level *=scale;
+    if(level&(~2047)){
+        if(level<0)
+            level=0;
+        else if(!(s->workaround_bugs&FF_BUG_DC_CLIP))
+            level=2047;
+    }
+    dc_val[0]= level;
+
+    return ret;
+}
+#endif