avcodec/mjpegenc_common: Constify ff_mjpeg_encode_{dc,picture_header}()

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/mjpegenc_common.c

@@ -56,10 +56,10 @@ static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
 }
 
 static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p,
-                              MJpegContext *m,
+                              const MJpegContext *m,
                               const uint8_t intra_matrix_permutation[64],
-                              uint16_t luma_intra_matrix[64],
-                              uint16_t chroma_intra_matrix[64],
+                              const uint16_t luma_intra_matrix[64],
+                              const uint16_t chroma_intra_matrix[64],
                               int hsample[3], int use_slices, int matrices_differ)
 {
     int size;
@@ -246,7 +246,7 @@ static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p,
     }
 }
 
-void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4])
+void ff_mjpeg_init_hvsample(const AVCodecContext *avctx, int hsample[4], int vsample[4])
 {
     if (avctx->codec_id == AV_CODEC_ID_LJPEG &&
         (   avctx->pix_fmt == AV_PIX_FMT_BGR0
@@ -273,10 +273,10 @@ void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4
 }
 
 void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
-                                    const AVFrame *frame, struct MJpegContext *m,
+                                    const AVFrame *frame, const struct MJpegContext *m,
                                     const uint8_t intra_matrix_permutation[64], int pred,
-                                    uint16_t luma_intra_matrix[64],
-                                    uint16_t chroma_intra_matrix[64],
+                                    const uint16_t luma_intra_matrix[64],
+                                    const uint16_t chroma_intra_matrix[64],
                                     int use_slices)
 {
     const int lossless = !m;
@@ -465,7 +465,7 @@ void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits)
 }
 
 void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
-                        uint8_t *huff_size, uint16_t *huff_code)
+                        const uint8_t huff_size[], const uint16_t huff_code[])
 {
     int mant, nbits;
 

libavcodec/mjpegenc_common.h

@@ -31,21 +31,21 @@ struct MJpegContext;
 int ff_mjpeg_add_icc_profile_size(AVCodecContext *avctx, const AVFrame *frame,
                                   size_t *max_pkt_size);
 void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
-                                    const AVFrame *frame, struct MJpegContext *m,
+                                    const AVFrame *frame, const struct MJpegContext *m,
                                     const uint8_t intra_matrix_permutation[64],
                                     int pred,
-                                    uint16_t luma_intra_matrix[64],
-                                    uint16_t chroma_intra_matrix[64],
+                                    const uint16_t luma_intra_matrix[64],
+                                    const uint16_t chroma_intra_matrix[64],
                                     int use_slices);
 void ff_mjpeg_encode_picture_trailer(PutBitContext *pb, int header_bits);
 void ff_mjpeg_escape_FF(PutBitContext *pb, int start);
 void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
                                   const uint8_t *bits_table,
                                   const uint8_t *val_table);
-void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4]);
+void ff_mjpeg_init_hvsample(const AVCodecContext *avctx, int hsample[4], int vsample[4]);
 
 void ff_mjpeg_encode_dc(PutBitContext *pb, int val,
-                        uint8_t *huff_size, uint16_t *huff_code);
+                        const uint8_t huff_size[], const uint16_t huff_code[]);
 
 int ff_mjpeg_encode_check_pix_fmt(AVCodecContext *avctx);