In ts demuxer, output pes packet as soon as they are complete.

This is needed for subtitles where packets are infrequent.
Patch by Janne Grunau, janne-ffmpeg at jannau dot net.

Originally committed as revision 23157 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 10 insertions, 0 deletions

diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index c92a9c2585..59603384d2 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -807,6 +807,16 @@ static int mpegts_push_data(MpegTSFilter *filter,
                 pes->data_index += buf_size;
             }
             buf_size = 0;
+            /* emit complete packets with known packet size
+             * decreases demuxer delay for infrequent packets like subtitles from
+             * a couple of seconds to milliseconds for properly muxed files.
+             * total_size is the number of bytes following pes_packet_length
+             * in the pes header, i.e. not counting the first 6 bytes */
+            if (pes->total_size < MAX_PES_PAYLOAD &&
+                pes->pes_header_size + pes->data_index == pes->total_size + 6) {
+                ts->stop_parse = 1;
+                new_pes_packet(pes, ts->pkt);
+            }
             break;
         case MPEGTS_SKIP:
             buf_size = 0;