lavf/dv: always provide avpriv_dv_* symbols

They are used from libavdevice.

configure

@@ -3532,6 +3532,7 @@ gdigrab_indev_deps="CreateDIBSection"
 gdigrab_indev_extralibs="-lgdi32"
 gdigrab_indev_select="bmp_decoder"
 iec61883_indev_deps="libiec61883"
+iec61883_indev_select="dv_demuxer"
 jack_indev_deps="libjack"
 jack_indev_deps_any="sem_timedwait dispatch_dispatch_h"
 kmsgrab_indev_deps="libdrm"

libavformat/Makefile

@@ -13,6 +13,7 @@ OBJS = allformats.o         \
        demux.o              \
        demux_utils.o        \
        dump.o               \
+       dv.o                 \
        format.o             \
        id3v1.o              \
        id3v2.o              \
@@ -184,7 +185,6 @@ OBJS-$(CONFIG_DSS_DEMUXER)               += dss.o
 OBJS-$(CONFIG_DTSHD_DEMUXER)             += dtshddec.o
 OBJS-$(CONFIG_DTS_DEMUXER)               += dtsdec.o rawdec.o
 OBJS-$(CONFIG_DTS_MUXER)                 += rawenc.o
-OBJS-$(CONFIG_DV_DEMUXER)                += dv.o
 OBJS-$(CONFIG_DV_MUXER)                  += dvenc.o
 OBJS-$(CONFIG_DVBSUB_DEMUXER)            += dvbsub.o rawdec.o
 OBJS-$(CONFIG_DVBTXT_DEMUXER)            += dvbtxt.o rawdec.o
@@ -711,7 +711,6 @@ SHLIBOBJS-$(CONFIG_RTP_MUXER)            += golomb_tab.o jpegtables.o \
 SHLIBOBJS-$(CONFIG_SPDIF_MUXER)          += dca_sample_rate_tab.o
 
 # libavdevice dependencies
-OBJS-$(CONFIG_IEC61883_INDEV)            += dv.o
 
 # Windows resource file
 SHLIBOBJS-$(HAVE_GNU_WINDRES)            += avformatres.o

libavformat/dv.c

@@ -28,6 +28,9 @@
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
+
+#include "config_components.h"
+
 #include <time.h>
 #include "avformat.h"
 #include "internal.h"
@@ -40,6 +43,8 @@
 #include "dv.h"
 #include "libavutil/avassert.h"
 
+#if CONFIG_DV_DEMUXER
+
 // Must be kept in sync with AVPacket
 struct DVPacket {
     int64_t  pts;
@@ -647,3 +652,21 @@ const AVInputFormat ff_dv_demuxer = {
     .read_seek      = dv_read_seek,
     .extensions     = "dv,dif",
 };
+
+#else // CONFIG_DV_DEMUXER
+DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
+{
+    return NULL;
+}
+
+int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
+{
+    return AVERROR(ENOSYS);
+}
+
+int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
+                             uint8_t *buf, int buf_size, int64_t pos)
+{
+    return AVERROR(ENOSYS);
+}
+#endif // CONFIG_DV_DEMUXER