dv1394: add a private option for video standard.

libavdevice/dv1394.c

@@ -30,6 +30,8 @@
 #include <time.h>
 #include <strings.h>
 
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
 #include "libavformat/avformat.h"
 
 #undef DV1394_DEBUG
@@ -38,6 +40,7 @@
 #include "dv1394.h"
 
 struct dv1394_data {
+    AVClass *class;
     int fd;
     int channel;
     int format;
@@ -90,10 +93,12 @@ static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap
     if (!dv->dv_demux)
         goto failed;
 
-    if (ap->standard && !strcasecmp(ap->standard, "pal"))
-        dv->format = DV1394_PAL;
-    else
-        dv->format = DV1394_NTSC;
+    if (ap->standard) {
+       if (!strcasecmp(ap->standard, "pal"))
+           dv->format = DV1394_PAL;
+       else
+           dv->format = DV1394_NTSC;
+    }
 
     if (ap->channel)
         dv->channel = ap->channel;
@@ -227,6 +232,20 @@ static int dv1394_close(AVFormatContext * context)
     return 0;
 }
 
+static const AVOption options[] = {
+    { "standard", "", offsetof(struct dv1394_data, format), FF_OPT_TYPE_INT, {.dbl = DV1394_NTSC}, DV1394_PAL, DV1394_NTSC, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+    { "PAL",      "", 0, FF_OPT_TYPE_CONST, {.dbl = DV1394_PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+    { "NTSC",     "", 0, FF_OPT_TYPE_CONST, {.dbl = DV1394_NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+    { NULL },
+};
+
+static const AVClass dv1394_class = {
+    .class_name = "DV1394 indev",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 AVInputFormat ff_dv1394_demuxer = {
     .name           = "dv1394",
     .long_name      = NULL_IF_CONFIG_SMALL("DV1394 A/V grab"),
@@ -234,5 +253,6 @@ AVInputFormat ff_dv1394_demuxer = {
     .read_header    = dv1394_read_header,
     .read_packet    = dv1394_read_packet,
     .read_close     = dv1394_close,
-    .flags          = AVFMT_NOFILE
+    .flags          = AVFMT_NOFILE,
+    .priv_class     = &dv1394_class,
 };