split wmv2 encoder and decoder in their own files

Originally committed as revision 11091 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 240 insertions, 0 deletions

diff --git a/libavcodec/wmv2enc.c b/libavcodec/wmv2enc.c
new file mode 100644
index 0000000000..641f0dc854
--- /dev/null
+++ b/libavcodec/wmv2enc.c
@@ -0,0 +1,240 @@
+/*
+ * Copyright (c) 2002 The FFmpeg Project.
+ *
+ * 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
+ */
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "mpegvideo.h"
+#include "msmpeg4.h"
+#include "msmpeg4data.h"
+#include "wmv2.h"
+
+
+static int encode_ext_header(Wmv2Context *w){
+    MpegEncContext * const s= &w->s;
+    PutBitContext pb;
+    int code;
+
+    init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
+
+    put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
+    put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
+
+    put_bits(&pb, 1, w->mspel_bit=1);
+    put_bits(&pb, 1, s->loop_filter);
+    put_bits(&pb, 1, w->abt_flag=1);
+    put_bits(&pb, 1, w->j_type_bit=1);
+    put_bits(&pb, 1, w->top_left_mv_flag=0);
+    put_bits(&pb, 1, w->per_mb_rl_bit=1);
+    put_bits(&pb, 3, code=1);
+
+    flush_put_bits(&pb);
+
+    s->slice_height = s->mb_height / code;
+
+    return 0;
+}
+
+static int wmv2_encode_init(AVCodecContext *avctx){
+    Wmv2Context * const w= avctx->priv_data;
+
+    if(MPV_encode_init(avctx) < 0)
+        return -1;
+
+    ff_wmv2_common_init(w);
+
+    avctx->extradata_size= 4;
+    avctx->extradata= av_mallocz(avctx->extradata_size + 10);
+    encode_ext_header(w);
+
+    return 0;
+}
+
+#if 0 /* unused, remove? */
+static int wmv2_encode_end(AVCodecContext *avctx){
+
+    if(MPV_encode_end(avctx) < 0)
+        return -1;
+
+    avctx->extradata_size= 0;
+    av_freep(&avctx->extradata);
+
+    return 0;
+}
+#endif
+
+int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
+{
+    Wmv2Context * const w= (Wmv2Context*)s;
+
+    put_bits(&s->pb, 1, s->pict_type - 1);
+    if(s->pict_type == I_TYPE){
+        put_bits(&s->pb, 7, 0);
+    }
+    put_bits(&s->pb, 5, s->qscale);
+
+    s->dc_table_index = 1;
+    s->mv_table_index = 1; /* only if P frame */
+//    s->use_skip_mb_code = 1; /* only if P frame */
+    s->per_mb_rl_table = 0;
+    s->mspel= 0;
+    w->per_mb_abt=0;
+    w->abt_type=0;
+    w->j_type=0;
+
+    assert(s->flipflop_rounding);
+
+    if (s->pict_type == I_TYPE) {
+        assert(s->no_rounding==1);
+        if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
+
+        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
+
+        if(!s->per_mb_rl_table){
+            ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
+            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
+        }
+
+        put_bits(&s->pb, 1, s->dc_table_index);
+
+        s->inter_intra_pred= 0;
+    }else{
+        int cbp_index;
+
+        put_bits(&s->pb, 2, SKIP_TYPE_NONE);
+
+        ff_msmpeg4_code012(&s->pb, cbp_index=0);
+        if(s->qscale <= 10){
+            int map[3]= {0,2,1};
+            w->cbp_table_index= map[cbp_index];
+        }else if(s->qscale <= 20){
+            int map[3]= {1,0,2};
+            w->cbp_table_index= map[cbp_index];
+        }else{
+            int map[3]= {2,1,0};
+            w->cbp_table_index= map[cbp_index];
+        }
+
+        if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
+
+        if(w->abt_flag){
+            put_bits(&s->pb, 1, w->per_mb_abt^1);
+            if(!w->per_mb_abt){
+                ff_msmpeg4_code012(&s->pb, w->abt_type);
+            }
+        }
+
+        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
+
+        if(!s->per_mb_rl_table){
+            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
+            s->rl_chroma_table_index = s->rl_table_index;
+        }
+        put_bits(&s->pb, 1, s->dc_table_index);
+        put_bits(&s->pb, 1, s->mv_table_index);
+
+        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
+    }
+    s->esc3_level_length= 0;
+    s->esc3_run_length= 0;
+
+    return 0;
+}
+
+/* Nearly identical to wmv1 but that is just because we do not use the
+ * useless M$ crap features. It is duplicated here in case someone wants
+ * to add support for these crap features. */
+void ff_wmv2_encode_mb(MpegEncContext * s,
+                       DCTELEM block[6][64],
+                       int motion_x, int motion_y)
+{
+    Wmv2Context * const w= (Wmv2Context*)s;
+    int cbp, coded_cbp, i;
+    int pred_x, pred_y;
+    uint8_t *coded_block;
+
+    ff_msmpeg4_handle_slices(s);
+
+    if (!s->mb_intra) {
+        /* compute cbp */
+        cbp = 0;
+        for (i = 0; i < 6; i++) {
+            if (s->block_last_index[i] >= 0)
+                cbp |= 1 << (5 - i);
+        }
+
+        put_bits(&s->pb,
+                 wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
+                 wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
+
+        /* motion vector */
+        h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
+        ff_msmpeg4_encode_motion(s, motion_x - pred_x,
+                              motion_y - pred_y);
+    } else {
+        /* compute cbp */
+        cbp = 0;
+        coded_cbp = 0;
+        for (i = 0; i < 6; i++) {
+            int val, pred;
+            val = (s->block_last_index[i] >= 1);
+            cbp |= val << (5 - i);
+            if (i < 4) {
+                /* predict value for close blocks only for luma */
+                pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
+                *coded_block = val;
+                val = val ^ pred;
+            }
+            coded_cbp |= val << (5 - i);
+        }
+#if 0
+        if (coded_cbp)
+            printf("cbp=%x %x\n", cbp, coded_cbp);
+#endif
+
+        if (s->pict_type == I_TYPE) {
+            put_bits(&s->pb,
+                     ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
+        } else {
+            put_bits(&s->pb,
+                     wmv2_inter_table[w->cbp_table_index][cbp][1],
+                     wmv2_inter_table[w->cbp_table_index][cbp][0]);
+        }
+        put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
+        if(s->inter_intra_pred){
+            s->h263_aic_dir=0;
+            put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
+        }
+    }
+
+    for (i = 0; i < 6; i++) {
+        ff_msmpeg4_encode_block(s, block[i], i);
+    }
+}
+
+AVCodec wmv2_encoder = {
+    "wmv2",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_WMV2,
+    sizeof(Wmv2Context),
+    wmv2_encode_init,
+    MPV_encode_picture,
+    MPV_encode_end,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+};