ffmpeg: backport detect MPEG streams with faulty DTS and discard

1 files changed, 92 insertions, 0 deletions

diff --git a/lib/ffmpeg/patches/0059-backport-detect-MPEG-streams-faulty-dts.patch b/lib/ffmpeg/patches/0059-backport-detect-MPEG-streams-faulty-dts.patch
new file mode 100644
index 0000000000..1ea599187c
--- /dev/null
+++ b/lib/ffmpeg/patches/0059-backport-detect-MPEG-streams-faulty-dts.patch
@@ -0,0 +1,92 @@
+From 2dcaa1b9d142ae113b28bffdbf7f8f8900b5e770 Mon Sep 17 00:00:00 2001
+From: Michael Niedermayer <michaelni@gmx.at>
+Date: Mon, 3 Mar 2014 01:55:18 +0100
+Subject: [PATCH] avformat/utils: detect MPEG streams with faulty DTS and
+ discard affected DTS
+
+Fixes issue2.ts
+
+Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
+---
+ libavformat/avformat.h |  7 +++++++
+ libavformat/utils.c    | 25 +++++++++++++++++++++++++
+ 2 files changed, 32 insertions(+)
+
+diff --git a/libavformat/avformat.h b/libavformat/avformat.h
+index 52eeb61..e0ec3da 100644
+--- a/libavformat/avformat.h
++++ b/libavformat/avformat.h
+@@ -988,6 +988,13 @@ enum AVStreamParseType {
+     int64_t pts_reorder_error[MAX_REORDER_DELAY+1];
+     uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1];
+ 
++    /**
++     * Internal data to analyze DTS and detect faulty mpeg streams
++     */
++    int64_t last_dts_for_order_check;
++    uint8_t dts_ordered;
++    uint8_t dts_misordered;
++
+ } AVStream;
+ 
+ AVRational av_stream_get_r_frame_rate(const AVStream *s);
+diff --git a/libavformat/utils.c b/libavformat/utils.c
+index 584edd3..4e262b1 100644
+--- a/libavformat/utils.c
++++ b/libavformat/utils.c
+@@ -1120,6 +1120,28 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
+     if (s->flags & AVFMT_FLAG_NOFILLIN)
+         return;
+ 
++    if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && pkt->dts != AV_NOPTS_VALUE) {
++        if (pkt->dts == pkt->pts && st->last_dts_for_order_check != AV_NOPTS_VALUE) {
++            if (st->last_dts_for_order_check <= pkt->dts) {
++                st->dts_ordered++;
++            } else {
++                av_log(s, st->dts_misordered ? AV_LOG_DEBUG : AV_LOG_WARNING,
++                       "DTS %"PRIi64" < %"PRIi64" out of order\n",
++                       pkt->dts,
++                       st->last_dts_for_order_check);
++                st->dts_misordered++;
++            }
++            if (st->dts_ordered + st->dts_misordered > 250) {
++                st->dts_ordered    >>= 1;
++                st->dts_misordered >>= 1;
++            }
++        }
++
++        st->last_dts_for_order_check = pkt->dts;
++        if (st->dts_ordered < 8*st->dts_misordered && pkt->dts == pkt->pts)
++            pkt->dts = AV_NOPTS_VALUE;
++    }
++
+     if ((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
+         pkt->dts = AV_NOPTS_VALUE;
+ 
+@@ -1664,6 +1686,7 @@ void ff_read_frame_flush(AVFormatContext *s)
+             st->parser = NULL;
+         }
+         st->last_IP_pts = AV_NOPTS_VALUE;
++        st->last_dts_for_order_check = AV_NOPTS_VALUE;
+         if (st->first_dts == AV_NOPTS_VALUE)
+             st->cur_dts = RELATIVE_TS_BASE;
+         else
+@@ -2488,6 +2511,7 @@ static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
+         st              = ic->streams[i];
+         st->cur_dts     = st->first_dts;
+         st->last_IP_pts = AV_NOPTS_VALUE;
++        st->last_dts_for_order_check = AV_NOPTS_VALUE;
+         for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
+             st->pts_buffer[j] = AV_NOPTS_VALUE;
+     }
+@@ -3623,6 +3647,7 @@ AVStream *avformat_new_stream(AVFormatContext *s, const AVCodec *c)
+     /* default pts setting is MPEG-like */
+     avpriv_set_pts_info(st, 33, 1, 90000);
+     st->last_IP_pts = AV_NOPTS_VALUE;
++    st->last_dts_for_order_check = AV_NOPTS_VALUE;
+     for (i = 0; i < MAX_REORDER_DELAY + 1; i++)
+         st->pts_buffer[i] = AV_NOPTS_VALUE;
+ 
+-- 
+1.8.5.5
+