[FFmpeg-cvslog] fftools/ffmpeg: Fallback to duration if sample rate is unavailable

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Tue May  1 22:44:07 2018 +0200| [83260729955b9249599a23be5f9ad4e9051db002] | committer: Michael Niedermayer

fftools/ffmpeg: Fallback to duration if sample rate is unavailable

Regression since: af1761f7
Fixes: Division by 0
Fixes: ffmpeg_crash_1

Found-by: Thuan Pham, Marcel Böhme, Andrew Santosa and Alexandru Razvan Caciulescu with AFLSmart
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 16d8b13b3b26c19d7f8856e039fe6662d96b4ff3)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=83260729955b9249599a23be5f9ad4e9051db002
---

 ffmpeg.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ffmpeg.c b/ffmpeg.c
index 2887e91d1a..5282027895 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -2396,8 +2396,12 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt)
         ist->dts = ist->next_dts;
         switch (ist->dec_ctx->codec_type) {
         case AVMEDIA_TYPE_AUDIO:
-            ist->next_dts += ((int64_t)AV_TIME_BASE * ist->dec_ctx->frame_size) /
-                             ist->dec_ctx->sample_rate;
+            if (ist->dec_ctx->sample_rate) {
+                ist->next_dts += ((int64_t)AV_TIME_BASE * ist->dec_ctx->frame_size) /
+                                  ist->dec_ctx->sample_rate;
+            } else {
+                ist->next_dts += av_rescale_q(pkt->duration, ist->st->time_base, AV_TIME_BASE_Q);
+            }
             break;
         case AVMEDIA_TYPE_VIDEO:
             if (ist->framerate.num) {