mpegvideo: move ff_draw_horiz_band() to mpegutils.c

Drop the mpegvideo dependency for svq3 in configure.

1 files changed, 80 insertions, 0 deletions

diff --git a/libavcodec/mpegutils.c b/libavcodec/mpegutils.c
new file mode 100644
index 0000000000..bc430f0531
--- /dev/null
+++ b/libavcodec/mpegutils.c
@@ -0,0 +1,80 @@
+/*
+ * Mpeg video formats-related defines and utility functions
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "libavutil/common.h"
+#include "libavutil/frame.h"
+#include "libavutil/pixdesc.h"
+
+#include "avcodec.h"
+#include "mpegutils.h"
+
+void ff_draw_horiz_band(AVCodecContext *avctx,
+                        AVFrame *cur, AVFrame *last,
+                        int y, int h, int picture_structure,
+                        int first_field, int low_delay)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
+    int vshift = desc->log2_chroma_h;
+    const int field_pic = picture_structure != PICT_FRAME;
+    if (field_pic) {
+        h <<= 1;
+        y <<= 1;
+    }
+
+    h = FFMIN(h, avctx->height - y);
+
+    if (field_pic && first_field &&
+        !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
+        return;
+
+    if (avctx->draw_horiz_band) {
+        AVFrame *src;
+        int offset[AV_NUM_DATA_POINTERS];
+        int i;
+
+        if (cur->pict_type == AV_PICTURE_TYPE_B || low_delay ||
+           (avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
+            src = cur;
+        else if (last)
+            src = last;
+        else
+            return;
+
+        if (cur->pict_type == AV_PICTURE_TYPE_B &&
+            picture_structure == PICT_FRAME &&
+            avctx->codec_id != AV_CODEC_ID_SVQ3) {
+            for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
+                offset[i] = 0;
+        } else {
+            offset[0]= y * src->linesize[0];
+            offset[1]=
+            offset[2]= (y >> vshift) * src->linesize[1];
+            for (i = 3; i < AV_NUM_DATA_POINTERS; i++)
+                offset[i] = 0;
+        }
+
+        emms_c();
+
+        avctx->draw_horiz_band(avctx, src, offset,
+                               y, picture_structure, h);
+    }
+}