avcodec/dnxhddata: move avpriv_dnxhd_parse_header_prefix to a header

It's a small and simple function that can be inlined.

This removes one private symbol and should reduce object dependencies with the next
major bump
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/dnxhddata.c

@@ -22,7 +22,6 @@
 #include "avcodec.h"
 #include "dnxhddata.h"
 #include "libavutil/common.h"
-#include "libavutil/intreadwrite.h"
 
 /* The quantization tables below are in zigzag order! */
 
@@ -1103,12 +1102,12 @@ int avpriv_dnxhd_get_interlaced(int cid)
     return ff_dnxhd_cid_table[i].flags & DNXHD_INTERLACED ? 1 : 0;
 }
 
+#if LIBAVCODEC_VERSION_MAJOR < 58
 uint64_t avpriv_dnxhd_parse_header_prefix(const uint8_t *buf)
 {
-    uint64_t prefix = AV_RB32(buf);
-    prefix = (prefix << 16) | buf[4] << 8;
-    return ff_dnxhd_check_header_prefix(prefix);
+    return ff_dnxhd_parse_header_prefix(buf);
 }
+#endif
 
 static int dnxhd_find_hr_cid(AVCodecContext *avctx)
 {

libavcodec/dnxhddata.h

@@ -25,6 +25,7 @@
 #include <stdint.h>
 #include "avcodec.h"
 #include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
 
 /** Additional profile info flags */
 #define DNXHD_INTERLACED   (1<<0)
@@ -83,7 +84,17 @@ static av_always_inline uint64_t ff_dnxhd_check_header_prefix(uint64_t prefix)
     return 0;
 }
 
+static av_always_inline uint64_t ff_dnxhd_parse_header_prefix(const uint8_t *buf)
+{
+    uint64_t prefix = AV_RB32(buf);
+    prefix = (prefix << 16) | buf[4] << 8;
+    return ff_dnxhd_check_header_prefix(prefix);
+}
+
 int avpriv_dnxhd_get_frame_size(int cid);
 int avpriv_dnxhd_get_interlaced(int cid);
+#if LIBAVCODEC_VERSION_MAJOR < 58
+attribute_deprecated
 uint64_t avpriv_dnxhd_parse_header_prefix(const uint8_t *buf);
+#endif
 #endif /* AVCODEC_DNXHDDATA_H */

libavcodec/dnxhddec.c

@@ -190,7 +190,7 @@ static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
         return AVERROR_INVALIDDATA;
     }
 
-    header_prefix = avpriv_dnxhd_parse_header_prefix(buf);
+    header_prefix = ff_dnxhd_parse_header_prefix(buf);
     if (header_prefix == 0) {
         av_log(ctx->avctx, AV_LOG_ERROR,
                "unknown header 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X\n",

libavformat/dnxhddec.c

@@ -30,7 +30,7 @@ static int dnxhd_probe(AVProbeData *p)
     int w, h, compression_id;
     if (p->buf_size < 0x2c)
         return 0;
-    if (avpriv_dnxhd_parse_header_prefix(p->buf) == 0)
+    if (ff_dnxhd_parse_header_prefix(p->buf) == 0)
         return 0;
     h = AV_RB16(p->buf + 0x18);
     w = AV_RB16(p->buf + 0x1a);

libavformat/movenc.c

@@ -1071,7 +1071,7 @@ static int mov_write_avid_tag(AVIOContext *pb, MOVTrack *track)
     int cid;
 
     if (track->vos_data && track->vos_len > 0x29) {
-        if (avpriv_dnxhd_parse_header_prefix(track->vos_data) != 0) {
+        if (ff_dnxhd_parse_header_prefix(track->vos_data) != 0) {
             /* looks like a DNxHD bit stream */
             interlaced = (track->vos_data[5] & 2);
             cid = AV_RB32(track->vos_data + 0x28);