mjpeg: use hpeldsp instead of dsputil for half-pel functions.

configure

@@ -1750,6 +1750,7 @@ ljpeg_encoder_select="aandcttables mpegvideoenc"
 loco_decoder_select="golomb"
 mdec_decoder_select="dsputil error_resilience mpegvideo"
 mimic_decoder_select="dsputil hpeldsp"
+mjpeg_decoder_select="dsputil hpeldsp"
 mjpeg_encoder_select="aandcttables dsputil mpegvideoenc"
 mlp_decoder_select="dsputil mlp_parser"
 motionpixels_decoder_select="dsputil"

libavcodec/mjpegdec.c

@@ -89,6 +89,7 @@ av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
     avcodec_get_frame_defaults(&s->picture);
 
     s->avctx = avctx;
+    ff_hpeldsp_init(&s->hdsp, avctx->flags);
     ff_dsputil_init(&s->dsp, avctx);
     ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
     s->buffer_size   = 0;
@@ -992,7 +993,7 @@ static av_always_inline void mjpeg_copy_block(MJpegDecodeContext *s,
                                               int linesize, int lowres)
 {
     switch (lowres) {
-    case 0: s->dsp.put_pixels_tab[1][0](dst, src, linesize, 8);
+    case 0: s->hdsp.put_pixels_tab[1][0](dst, src, linesize, 8);
         break;
     case 1: copy_block4(dst, src, linesize, linesize, 4);
         break;

libavcodec/mjpegdec.h

@@ -34,6 +34,7 @@
 #include "avcodec.h"
 #include "get_bits.h"
 #include "dsputil.h"
+#include "hpeldsp.h"
 
 #define MAX_COMPONENTS 4
 
@@ -97,6 +98,7 @@ typedef struct MJpegDecodeContext {
     uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
     ScanTable scantable;
     DSPContext dsp;
+    HpelDSPContext hdsp;
 
     int restart_interval;
     int restart_count;