[FFmpeg-devel] [PATCH 3/3] Implement CODEC_CAP_DRAW_HORIZ_BAND for VP3 decoder

[David Conrad]

---
 libavcodec/vp3.c |   32 +++++++++++++++++++++++++++++---
 1 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index cd0c3c7..e35ab5f 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -1450,6 +1450,32 @@ static void apply_loop_filter(Vp3DecodeContext *s, int plane, int ystart, int ye
         }
 }
 
+static void vp3_draw_horiz_band(Vp3DecodeContext *s, int y)
+{
+    int h, cy;
+    int offset[4];
+
+    if(s->avctx->draw_horiz_band==NULL)
+        return;
+
+    h = 16;
+
+    if (!s->flipped_image) {
+        if (y == 0)
+            h -= s->height - s->avctx->height;  // account for non-mod16
+        y = s->height - y - 16;
+    }
+
+    cy = y >> 1;
+    offset[0] = s->current_frame.linesize[0]*y;
+    offset[1] = s->current_frame.linesize[1]*cy;
+    offset[2] = s->current_frame.linesize[2]*cy;
+    offset[3] = 0;
+
+    emms_c();
+    s->avctx->draw_horiz_band(s->avctx, &s->current_frame, offset, y, 3, h);
+}
+
 /*
  * Perform the final rendering for a particular slice of data.
  * The slice number ranges from 0..(macroblock_height - 1).
@@ -1624,7 +1650,7 @@ static void render_slice(Vp3DecodeContext *s, int slice)
       *     dispatch (slice - 1);
       */
 
-    emms_c();
+    vp3_draw_horiz_band(s, 16*slice);
 }
 
 /*
@@ -2367,7 +2393,7 @@ AVCodec theora_decoder = {
     NULL,
     vp3_decode_end,
     vp3_decode_frame,
-    CODEC_CAP_DR1,
+    CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,
     NULL,
     .long_name = NULL_IF_CONFIG_SMALL("Theora"),
 };
@@ -2382,7 +2408,7 @@ AVCodec vp3_decoder = {
     NULL,
     vp3_decode_end,
     vp3_decode_frame,
-    CODEC_CAP_DR1,
+    CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,
     NULL,
     .long_name = NULL_IF_CONFIG_SMALL("On2 VP3"),
 };
-- 
1.6.6