[FFmpeg-cvslog] diracdec: Add slice threading to HQ profile

[Kieran Kunhya]

ffmpeg | branch: master | Kieran Kunhya <kieran at kunhya.com> | Tue Jan 12 00:51:49 2016 +0000| [bfc8a4dabe5a0154b31128b59dca575010176441] | committer: Rostislav Pehlivanov

diracdec: Add slice threading to HQ profile

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bfc8a4dabe5a0154b31128b59dca575010176441
---

 libavcodec/diracdec.c |   38 ++++++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index 9d985351..c67f845 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -832,11 +832,13 @@ static int decode_lowdelay_slice(AVCodecContext *avctx, void *arg)
  * VC-2 Specification ->
  * 13.5.3 hq_slice(sx,sy)
  */
-static int decode_hq_slice(DiracContext *s, GetBitContext *gb,
-                           int slice_x, int slice_y)
+static int decode_hq_slice(AVCodecContext *avctx, void *arg)
 {
     int i, quant, level, orientation, quant_idx;
     uint8_t quants[MAX_DWT_LEVELS][4];
+    DiracContext *s = avctx->priv_data;
+    DiracSlice *slice = arg;
+    GetBitContext *gb = &slice->gb;
 
     skip_bits_long(gb, 8*s->highquality.prefix_bytes);
     quant_idx = get_bits(gb, 8);
@@ -856,7 +858,7 @@ static int decode_hq_slice(DiracContext *s, GetBitContext *gb,
         int bits_end = get_bits_count(gb) + bits_left;
         for (level = 0; level < s->wavelet_depth; level++) {
             for (orientation = !!level; orientation < 4; orientation++) {
-                decode_subband(s, gb, quants[level][orientation], slice_x, slice_y, bits_end,
+                decode_subband(s, gb, quants[level][orientation], slice->slice_x, slice->slice_y, bits_end,
                                &s->plane[i].band[level][orientation], NULL);
             }
         }
@@ -873,7 +875,7 @@ static int decode_hq_slice(DiracContext *s, GetBitContext *gb,
 static int decode_lowdelay(DiracContext *s)
 {
     AVCodecContext *avctx = s->avctx;
-    int slice_x, slice_y, bytes, bufsize;
+    int slice_x, slice_y, bytes = 0, bufsize;
     const uint8_t *buf;
     DiracSlice *slices;
     int slice_num = 0;
@@ -888,11 +890,31 @@ static int decode_lowdelay(DiracContext *s)
     bufsize = get_bits_left(&s->gb);
 
     if (s->hq_picture) {
-        for (slice_y = 0; slice_y < s->num_y; slice_y++) {
-            for (slice_x = 0; slice_x < s->num_x; slice_x++) {
-                decode_hq_slice(s, &s->gb, slice_x, slice_y);
+        int i;
+
+        for (slice_y = 0; bufsize > 0 && slice_y < s->num_y; slice_y++) {
+            for (slice_x = 0; bufsize > 0 && slice_x < s->num_x; slice_x++) {
+                bytes = s->highquality.prefix_bytes + 1;
+                for (i = 0; i < 3; i++) {
+                    if (bytes <= bufsize/8)
+                        bytes += buf[bytes] * s->highquality.size_scaler + 1;
+                }
+
+                slices[slice_num].bytes   = bytes;
+                slices[slice_num].slice_x = slice_x;
+                slices[slice_num].slice_y = slice_y;
+                init_get_bits(&slices[slice_num].gb, buf, bufsize);
+                slice_num++;
+
+                buf     += bytes;
+                if (bufsize/8 >= bytes)
+                    bufsize -= bytes*8;
+                else
+                    bufsize = 0;
             }
         }
+        avctx->execute(avctx, decode_hq_slice, slices, NULL, slice_num,
+                       sizeof(DiracSlice));
     } else {
         for (slice_y = 0; bufsize > 0 && slice_y < s->num_y; slice_y++) {
             for (slice_x = 0; bufsize > 0 && slice_x < s->num_x; slice_x++) {
@@ -2199,6 +2221,6 @@ AVCodec ff_dirac_decoder = {
     .init           = dirac_decode_init,
     .close          = dirac_decode_end,
     .decode         = dirac_decode_frame,
-    .capabilities   = AV_CODEC_CAP_DELAY,
+    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_DR1,
     .flush          = dirac_decode_flush,
 };