oma: Report a timestamp

Reported-By: jb@videolan.org
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavformat/omadec.c

@@ -47,6 +47,7 @@
 #include "internal.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/des.h"
+#include "libavutil/mathematics.h"
 #include "oma.h"
 #include "pcm.h"
 #include "id3v2.h"
@@ -418,9 +419,12 @@ static int oma_read_header(AVFormatContext *s)
 
 static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
-    OMAContext *oc = s->priv_data;
-    int packet_size = s->streams[0]->codec->block_align;
-    int ret = av_get_packet(s->pb, pkt, packet_size);
+    OMAContext *oc  = s->priv_data;
+    AVStream *st    = s->streams[0];
+    int packet_size = st->codec->block_align;
+    int byte_rate   = st->codec->bit_rate >> 3;
+    int64_t pos     = avio_tell(s->pb);
+    int ret         = av_get_packet(s->pb, pkt, packet_size);
 
     if (ret < packet_size)
         pkt->flags |= AV_PKT_FLAG_CORRUPT;
@@ -432,6 +436,12 @@ static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
 
     pkt->stream_index = 0;
 
+    if (pos > 0) {
+        pkt->pts =
+        pkt->dts = av_rescale(pos, st->time_base.den,
+                              byte_rate * (int64_t)st->time_base.num);
+    }
+
     if (oc->encrypted) {
         /* previous unencrypted block saved in IV for
          * the next packet (CBC mode) */