avcodec/jpeg2000dec: add slice threading support

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/jpeg2000dec.c

@@ -1755,9 +1755,12 @@ WRITE_FRAME(16, uint16_t)
 
 #undef WRITE_FRAME
 
-static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
-                                AVFrame *picture)
+static int jpeg2000_decode_tile(AVCodecContext *avctx, void *td,
+                                int jobnr, int threadnr)
 {
+    Jpeg2000DecoderContext *s = avctx->priv_data;
+    AVFrame *picture = td;
+    Jpeg2000Tile *tile = s->tile + jobnr;
     int x;
 
     tile_codeblocks(s, tile);
@@ -2067,7 +2070,7 @@ static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
     Jpeg2000DecoderContext *s = avctx->priv_data;
     ThreadFrame frame = { .f = data };
     AVFrame *picture = data;
-    int tileno, ret;
+    int ret;
 
     s->avctx     = avctx;
     bytestream2_init(&s->g, avpkt->data, avpkt->size);
@@ -2114,9 +2117,7 @@ static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
     if (ret = jpeg2000_read_bitstream_packets(s))
         goto end;
 
-    for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
-        if (ret = jpeg2000_decode_tile(s, s->tile + tileno, picture))
-            goto end;
+    avctx->execute2(avctx, jpeg2000_decode_tile, picture, NULL, s->numXtiles * s->numYtiles);
 
     jpeg2000_dec_cleanup(s);
 
@@ -2159,7 +2160,7 @@ AVCodec ff_jpeg2000_decoder = {
     .long_name        = NULL_IF_CONFIG_SMALL("JPEG 2000"),
     .type             = AVMEDIA_TYPE_VIDEO,
     .id               = AV_CODEC_ID_JPEG2000,
-    .capabilities     = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_DR1,
+    .capabilities     = AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_DR1,
     .priv_data_size   = sizeof(Jpeg2000DecoderContext),
     .init_static_data = jpeg2000_init_static_data,
     .init             = jpeg2000_decode_init,