mjpeg/ljpegenc: factor ff_mjpeg_init_hvsample() out

This reduces the amount of duplicated code
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/ljpegenc.c

@@ -272,7 +272,6 @@ static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
 {
     LJpegEncContext *s = avctx->priv_data;
-    int chroma_v_shift, chroma_h_shift;
 
     if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
          avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
@@ -296,26 +295,7 @@ static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
     ff_dsputil_init(&s->dsp, avctx);
     ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
 
-    av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
-                                     &chroma_v_shift);
-
-    if (   avctx->pix_fmt == AV_PIX_FMT_BGR0
-        || avctx->pix_fmt == AV_PIX_FMT_BGRA
-        || avctx->pix_fmt == AV_PIX_FMT_BGR24) {
-        s->vsample[0] = s->hsample[0] =
-        s->vsample[1] = s->hsample[1] =
-        s->vsample[2] = s->hsample[2] = 1;
-    } else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P || avctx->pix_fmt == AV_PIX_FMT_YUVJ444P) {
-        s->vsample[0] = s->vsample[1] = s->vsample[2] = 2;
-        s->hsample[0] = s->hsample[1] = s->hsample[2] = 1;
-    } else {
-        s->vsample[0] = 2;
-        s->vsample[1] = 2 >> chroma_v_shift;
-        s->vsample[2] = 2 >> chroma_v_shift;
-        s->hsample[0] = 2;
-        s->hsample[1] = 2 >> chroma_h_shift;
-        s->hsample[2] = 2 >> chroma_h_shift;
-    }
+    ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
 
     ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
                                  s->huff_code_dc_luminance,

libavcodec/mjpegenc.c

@@ -204,14 +204,9 @@ static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p)
     }
 }
 
-void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
-                                    ScanTable *intra_scantable,
-                                    uint16_t intra_matrix[64])
+void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[3], int vsample[3])
 {
     int chroma_h_shift, chroma_v_shift;
-    const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV;
-    int hsample[3], vsample[3];
-    int i;
 
     av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
                                      &chroma_v_shift);
@@ -233,6 +228,17 @@ void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
         hsample[1] = 2 >> chroma_h_shift;
         hsample[2] = 2 >> chroma_h_shift;
     }
+}
+
+void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
+                                    ScanTable *intra_scantable,
+                                    uint16_t intra_matrix[64])
+{
+    const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV;
+    int hsample[3], vsample[3];
+    int i;
+
+    ff_mjpeg_init_hvsample(avctx, hsample, vsample);
 
     put_marker(pb, SOI);
 

libavcodec/mjpegenc.h

@@ -57,6 +57,7 @@ void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
 void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits);
 void ff_mjpeg_escape_FF(PutBitContext *pb, int start);
 void ff_mjpeg_encode_stuffing(MpegEncContext *s);
+void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[3], int vsample[3]);
 void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
                         uint8_t *huff_size, uint16_t *huff_code);
 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[6][64]);