mpegtsenc: allow user triggered PES packet flushing

Signed-off-by: Jindrich Makovicka <jindrich.makovicka@nangu.tv>
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/mpegtsenc.c

@@ -935,7 +935,7 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
     avio_flush(s->pb);
 }
 
-static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
+static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
 {
     AVStream *st = s->streams[pkt->stream_index];
     int size = pkt->size;
@@ -1059,27 +1059,48 @@ static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
     return 0;
 }
 
-static int mpegts_write_end(AVFormatContext *s)
+static void mpegts_write_flush(AVFormatContext *s)
 {
-    MpegTSWrite *ts = s->priv_data;
-    MpegTSWriteStream *ts_st;
-    MpegTSService *service;
-    AVStream *st;
     int i;
 
     /* flush current packets */
     for(i = 0; i < s->nb_streams; i++) {
-        st = s->streams[i];
-        ts_st = st->priv_data;
+        AVStream *st = s->streams[i];
+        MpegTSWriteStream *ts_st = st->priv_data;
         if (ts_st->payload_size > 0) {
             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
                              ts_st->payload_pts, ts_st->payload_dts,
                              ts_st->payload_flags & AV_PKT_FLAG_KEY);
+            ts_st->payload_size = 0;
         }
+    }
+    avio_flush(s->pb);
+}
+
+static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    if (!pkt) {
+        mpegts_write_flush(s);
+        return 1;
+    } else {
+        return mpegts_write_packet_internal(s, pkt);
+    }
+}
+
+static int mpegts_write_end(AVFormatContext *s)
+{
+    MpegTSWrite *ts = s->priv_data;
+    MpegTSService *service;
+    int i;
+
+    mpegts_write_flush(s);
+
+    for(i = 0; i < s->nb_streams; i++) {
+        AVStream *st = s->streams[i];
+        MpegTSWriteStream *ts_st = st->priv_data;
         av_freep(&ts_st->payload);
         av_freep(&ts_st->adts);
     }
-    avio_flush(s->pb);
 
     for(i = 0; i < ts->nb_services; i++) {
         service = ts->services[i];
@@ -1103,5 +1124,6 @@ AVOutputFormat ff_mpegts_muxer = {
     .write_header      = mpegts_write_header,
     .write_packet      = mpegts_write_packet,
     .write_trailer     = mpegts_write_end,
+    .flags             = AVFMT_ALLOW_FLUSH,
     .priv_class = &mpegts_muxer_class,
 };