huffyuv: Add multithreading support

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit 76d8846c)

libavcodec/huffyuv.c

@@ -32,6 +32,7 @@
 #include "get_bits.h"
 #include "put_bits.h"
 #include "dsputil.h"
+#include "thread.h"
 
 #define VLC_BITS 11
 
@@ -527,6 +528,28 @@ s->bgr32=1;
 
     return 0;
 }
+
+static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
+{
+    HYuvContext *s = avctx->priv_data;
+    int i;
+
+    avctx->coded_frame= &s->picture;
+    alloc_temp(s);
+
+    for (i = 0; i < 6; i++)
+        s->vlc[i].table = NULL;
+
+    if(s->version==2){
+        if(read_huffman_tables(s, ((uint8_t*)avctx->extradata)+4, avctx->extradata_size) < 0)
+            return -1;
+    }else{
+        if(read_old_huffman_tables(s) < 0)
+            return -1;
+    }
+
+    return 0;
+}
 #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */
 
 #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER
@@ -950,10 +973,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
     s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
 
     if(p->data[0])
-        avctx->release_buffer(avctx, p);
+        ff_thread_release_buffer(avctx, p);
 
     p->reference= 0;
-    if(avctx->get_buffer(avctx, p) < 0){
+    if(ff_thread_get_buffer(avctx, p) < 0){
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
@@ -1425,8 +1448,9 @@ AVCodec ff_huffyuv_decoder = {
     NULL,
     decode_end,
     decode_frame,
-    CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,
+    CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_FRAME_THREADS,
     NULL,
+    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),
 };
 #endif
@@ -1441,8 +1465,9 @@ AVCodec ff_ffvhuff_decoder = {
     NULL,
     decode_end,
     decode_frame,
-    CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,
+    CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_FRAME_THREADS,
     NULL,
+    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),
 };
 #endif