[FFmpeg-devel] [PATCH] fix pcm_read_seek with negative timestamp

Reimar Döffinger Reimar.Doeffinger
Sat Mar 14 12:04:44 CET 2009


Hello,
currently pcm_read seek for negative timestamps either seeks somewhere
before data_offset (clearly broken) or fails (possibly broken).
This patch treats negative time stamps as 0, which would be
consistent with the behaviour of the generic index handling code.
I am not really sure which behaviour is right, but I am convinced that
1) we should never seek before data_offset and 2) behaviour of the
different seek functions should be consistent.
Attached is the diff of the seek regression test, except for the flac
part, the changes are a supersection of what the GENERIC_INDEX patch
changes.

diff --git a/libavformat/raw.c b/libavformat/raw.c
index 224c26f..ba73dca 100644
--- a/libavformat/raw.c
+++ b/libavformat/raw.c
@@ -232,6 +232,7 @@ int pcm_read_seek(AVFormatContext *s,
 
     if (block_align <= 0 || byte_rate <= 0)
         return -1;
+    if (timestamp < 0) timestamp = 0;
 
     /* compute the position by aligning it to block_align */
     pos = av_rescale_rnd(timestamp * byte_rate,


Greetings,
Reimar D?ffinger
-------------- next part --------------
--- seek.regression.ref	2009-03-13 20:46:43.000000000 +0100
+++ data/seek.regression	2009-03-14 11:54:31.000000000 +0100
@@ -42,19 +42,22 @@
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 ----------------
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@@ -236,19 +258,22 @@
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+ret: 0 st: 0 ts:-0.740839 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:54 size:4096 flags:1
 ret: 0 st:-1 ts:2.153336 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:189978 size:0 flags:1
 ret: 0 st:-1 ts:1.047503 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:92444 size:0 flags:1
-ret:-1 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:54 size:4096 flags:1
 ret: 0 st: 0 ts:2.835828 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:250174 size:0 flags:1
 ret: 0 st:-1 ts:1.730004 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:152640 size:0 flags:1
 ret: 0 st:-1 ts:0.624171 flags:1
 ret: 0 st: 0 dts:0.624172 pts:0.624172 pos:55106 size:4096 flags:1
-ret:-1 st: 0 ts:-0.481655 flags:0
+ret: 0 st: 0 ts:-0.481655 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:54 size:4096 flags:1
 ret: 0 st: 0 ts:2.412494 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:212836 size:0 flags:1
 ret: 0 st:-1 ts:1.306672 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:115302 size:0 flags:1
 ret: 0 st:-1 ts:0.200839 flags:1
 ret: 0 st: 0 dts:0.200839 pts:0.200839 pos:17768 size:4096 flags:1
-ret:-1 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:54 size:4096 flags:1
 ret: 0 st: 0 ts:1.989184 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:175500 size:0 flags:1
 ret: 0 st:-1 ts:0.883340 flags:0
 ret: 0 st: 0 dts:0.883333 pts:0.883333 pos:77964 size:4096 flags:1
-ret:-1 st:-1 ts:-0.222493 flags:1
+ret: 0 st:-1 ts:-0.222493 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:54 size:4096 flags:1
 ret: 0 st: 0 ts:2.671678 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:235696 size:0 flags:1
 ret: 0 st: 0 ts:1.565850 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:138162 size:0 flags:1
 ret: 0 st:-1 ts:0.460008 flags:0
 ret: 0 st: 0 dts:0.460000 pts:0.460000 pos:40626 size:4096 flags:1
-ret:-1 st:-1 ts:-0.645825 flags:1
+ret: 0 st:-1 ts:-0.645825 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:54 size:4096 flags:1
 ----------------
 tests/data/b-libav.al
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
-ret:-1 st:-1 ts:-1.000000 flags:0
+ret: 0 st:-1 ts:-1.000000 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st:-1 ts:1.894167 flags:1
 ret: 0 st: 0 dts:1.894150 pts:1.894150 pos:41766 size:1024 flags:1
 ret: 0 st: 0 ts:0.788345 flags:0
 ret: 0 st: 0 dts:0.788345 pts:0.788345 pos:17383 size:1024 flags:1
-ret:-1 st: 0 ts:-0.317506 flags:1
+ret: 0 st: 0 ts:-0.317506 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st:-1 ts:2.576668 flags:0
 ret:-5
 ret: 0 st:-1 ts:1.470835 flags:1
 ret: 0 st: 0 dts:1.470839 pts:1.470839 pos:32432 size:1024 flags:1
 ret: 0 st: 0 ts:0.364989 flags:0
 ret: 0 st: 0 dts:0.364989 pts:0.364989 pos:8048 size:1024 flags:1
-ret:-1 st: 0 ts:-0.740816 flags:1
+ret: 0 st: 0 ts:-0.740816 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st:-1 ts:2.153336 flags:0
 ret:-5
 ret: 0 st:-1 ts:1.047503 flags:1
 ret: 0 st: 0 dts:1.047483 pts:1.047483 pos:23097 size:1024 flags:1
-ret:-1 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st: 0 ts:2.835828 flags:1
 ret:-5
 ret: 0 st:-1 ts:1.730004 flags:0
 ret: 0 st: 0 dts:1.730023 pts:1.730023 pos:38147 size:1024 flags:1
 ret: 0 st:-1 ts:0.624171 flags:1
 ret: 0 st: 0 dts:0.624172 pts:0.624172 pos:13763 size:1024 flags:1
-ret:-1 st: 0 ts:-0.481678 flags:0
+ret: 0 st: 0 ts:-0.481678 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st: 0 ts:2.412517 flags:1
 ret:-5
 ret: 0 st:-1 ts:1.306672 flags:0
 ret: 0 st: 0 dts:1.306667 pts:1.306667 pos:28812 size:1024 flags:1
 ret: 0 st:-1 ts:0.200839 flags:1
 ret: 0 st: 0 dts:0.200816 pts:0.200816 pos:4428 size:1024 flags:1
-ret:-1 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st: 0 ts:1.989161 flags:1
 ret: 0 st: 0 dts:1.989161 pts:1.989161 pos:43861 size:683 flags:1
 ret: 0 st:-1 ts:0.883340 flags:0
 ret: 0 st: 0 dts:0.883356 pts:0.883356 pos:19478 size:1024 flags:1
-ret:-1 st:-1 ts:-0.222493 flags:1
+ret: 0 st:-1 ts:-0.222493 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st: 0 ts:2.671655 flags:0
 ret:-5
 ret: 0 st: 0 ts:1.565850 flags:1
 ret: 0 st: 0 dts:1.565850 pts:1.565850 pos:34527 size:1024 flags:1
 ret: 0 st:-1 ts:0.460008 flags:0
 ret: 0 st: 0 dts:0.460000 pts:0.460000 pos:10143 size:1024 flags:1
-ret:-1 st:-1 ts:-0.645825 flags:1
+ret: 0 st:-1 ts:-0.645825 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ----------------
 tests/data/b-libav.asf
 ret: 0 st: 0 dts:3.100000 pts:3.100000 pos:575 size:28874 flags:1
@@ -2630,50 +2683,58 @@
 ----------------
 tests/data/b-libav.au
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
-ret:-1 st:-1 ts:-1.000000 flags:0
+ret: 0 st:-1 ts:-1.000000 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
 ret: 0 st:-1 ts:1.894167 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:167090 size:0 flags:1
 ret: 0 st: 0 ts:0.788345 flags:0
 ret: 0 st: 0 dts:0.788345 pts:0.788345 pos:69556 size:4096 flags:1
-ret:-1 st: 0 ts:-0.317506 flags:1
+ret: 0 st: 0 ts:-0.317506 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
 ret: 0 st:-1 ts:2.576668 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:227286 size:0 flags:1
 ret: 0 st:-1 ts:1.470835 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:129752 size:0 flags:1
 ret: 0 st: 0 ts:0.365011 flags:0
 ret: 0 st: 0 dts:0.365011 pts:0.365011 pos:32218 size:4096 flags:1
-ret:-1 st: 0 ts:-0.740839 flags:1
+ret: 0 st: 0 ts:-0.740839 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
 ret: 0 st:-1 ts:2.153336 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:189948 size:0 flags:1
 ret: 0 st:-1 ts:1.047503 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:92414 size:0 flags:1
-ret:-1 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
 ret: 0 st: 0 ts:2.835828 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:250144 size:0 flags:1
 ret: 0 st:-1 ts:1.730004 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:152610 size:0 flags:1
 ret: 0 st:-1 ts:0.624171 flags:1
 ret: 0 st: 0 dts:0.624172 pts:0.624172 pos:55076 size:4096 flags:1
-ret:-1 st: 0 ts:-0.481655 flags:0
+ret: 0 st: 0 ts:-0.481655 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
 ret: 0 st: 0 ts:2.412494 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:212806 size:0 flags:1
 ret: 0 st:-1 ts:1.306672 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:115272 size:0 flags:1
 ret: 0 st:-1 ts:0.200839 flags:1
 ret: 0 st: 0 dts:0.200839 pts:0.200839 pos:17738 size:4096 flags:1
-ret:-1 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
 ret: 0 st: 0 ts:1.989184 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:175470 size:0 flags:1
 ret: 0 st:-1 ts:0.883340 flags:0
 ret: 0 st: 0 dts:0.883333 pts:0.883333 pos:77934 size:4096 flags:1
-ret:-1 st:-1 ts:-0.222493 flags:1
+ret: 0 st:-1 ts:-0.222493 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
 ret: 0 st: 0 ts:2.671678 flags:0
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:235666 size:0 flags:1
 ret: 0 st: 0 ts:1.565850 flags:1
 ret: 0 st: 0 dts:-209146758205323.718750 pts:-209146758205323.718750 pos:138132 size:0 flags:1
 ret: 0 st:-1 ts:0.460008 flags:0
 ret: 0 st: 0 dts:0.460000 pts:0.460000 pos:40596 size:4096 flags:1
-ret:-1 st:-1 ts:-0.645825 flags:1
+ret: 0 st:-1 ts:-0.645825 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:24 size:4096 flags:1
 ----------------
 tests/data/b-libav.avi
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:9908 size:28118 flags:1
@@ -3513,7 +3574,7 @@
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:398 size:31393 flags:1
 ----------------
 tests/data/b-libav.swf
-ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:65 size:31385 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:55 size:31385 flags:1
 ret:-1 st:-1 ts:-1.000000 flags:0
 ret:-1 st:-1 ts:1.894167 flags:1
 ret:-1 st: 0 ts:0.800000 flags:0
@@ -3598,50 +3659,58 @@
 ----------------
 tests/data/b-libav.ul
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
-ret:-1 st:-1 ts:-1.000000 flags:0
+ret: 0 st:-1 ts:-1.000000 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st:-1 ts:1.894167 flags:1
 ret: 0 st: 0 dts:1.894150 pts:1.894150 pos:41766 size:1024 flags:1
 ret: 0 st: 0 ts:0.788345 flags:0
 ret: 0 st: 0 dts:0.788345 pts:0.788345 pos:17383 size:1024 flags:1
-ret:-1 st: 0 ts:-0.317506 flags:1
+ret: 0 st: 0 ts:-0.317506 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st:-1 ts:2.576668 flags:0
 ret:-5
 ret: 0 st:-1 ts:1.470835 flags:1
 ret: 0 st: 0 dts:1.470839 pts:1.470839 pos:32432 size:1024 flags:1
 ret: 0 st: 0 ts:0.364989 flags:0
 ret: 0 st: 0 dts:0.364989 pts:0.364989 pos:8048 size:1024 flags:1
-ret:-1 st: 0 ts:-0.740816 flags:1
+ret: 0 st: 0 ts:-0.740816 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st:-1 ts:2.153336 flags:0
 ret:-5
 ret: 0 st:-1 ts:1.047503 flags:1
 ret: 0 st: 0 dts:1.047483 pts:1.047483 pos:23097 size:1024 flags:1
-ret:-1 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st: 0 ts:2.835828 flags:1
 ret:-5
 ret: 0 st:-1 ts:1.730004 flags:0
 ret: 0 st: 0 dts:1.730023 pts:1.730023 pos:38147 size:1024 flags:1
 ret: 0 st:-1 ts:0.624171 flags:1
 ret: 0 st: 0 dts:0.624172 pts:0.624172 pos:13763 size:1024 flags:1
-ret:-1 st: 0 ts:-0.481678 flags:0
+ret: 0 st: 0 ts:-0.481678 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st: 0 ts:2.412517 flags:1
 ret:-5
 ret: 0 st:-1 ts:1.306672 flags:0
 ret: 0 st: 0 dts:1.306667 pts:1.306667 pos:28812 size:1024 flags:1
 ret: 0 st:-1 ts:0.200839 flags:1
 ret: 0 st: 0 dts:0.200816 pts:0.200816 pos:4428 size:1024 flags:1
-ret:-1 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st: 0 ts:1.989161 flags:1
 ret: 0 st: 0 dts:1.989161 pts:1.989161 pos:43861 size:683 flags:1
 ret: 0 st:-1 ts:0.883340 flags:0
 ret: 0 st: 0 dts:0.883356 pts:0.883356 pos:19478 size:1024 flags:1
-ret:-1 st:-1 ts:-0.222493 flags:1
+ret: 0 st:-1 ts:-0.222493 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ret: 0 st: 0 ts:2.671655 flags:0
 ret:-5
 ret: 0 st: 0 ts:1.565850 flags:1
 ret: 0 st: 0 dts:1.565850 pts:1.565850 pos:34527 size:1024 flags:1
 ret: 0 st:-1 ts:0.460008 flags:0
 ret: 0 st: 0 dts:0.460000 pts:0.460000 pos:10143 size:1024 flags:1
-ret:-1 st:-1 ts:-0.645825 flags:1
+ret: 0 st:-1 ts:-0.645825 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:0 size:1024 flags:1
 ----------------
 tests/data/b-libav.voc
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:32 size:512 flags:1
@@ -3674,50 +3743,58 @@
 ----------------
 tests/data/b-libav.wav
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
-ret:-1 st:-1 ts:-1.000000 flags:0
+ret: 0 st:-1 ts:-1.000000 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st:-1 ts:1.894167 flags:1
 ret:-5
 ret: 0 st: 0 ts:0.788345 flags:0
 ret: 0 st: 0 dts:0.788345 pts:0.788345 pos:69576 size:4096 flags:1
-ret:-1 st: 0 ts:-0.317506 flags:1
+ret: 0 st: 0 ts:-0.317506 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st:-1 ts:2.576668 flags:0
 ret:-5
 ret: 0 st:-1 ts:1.470835 flags:1
 ret:-5
 ret: 0 st: 0 ts:0.365011 flags:0
 ret: 0 st: 0 dts:0.365011 pts:0.365011 pos:32238 size:4096 flags:1
-ret:-1 st: 0 ts:-0.740839 flags:1
+ret: 0 st: 0 ts:-0.740839 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st:-1 ts:2.153336 flags:0
 ret:-5
 ret: 0 st:-1 ts:1.047503 flags:1
 ret:-5
-ret:-1 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 ts:-0.058322 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st: 0 ts:2.835828 flags:1
 ret:-5
 ret: 0 st:-1 ts:1.730004 flags:0
 ret:-5
 ret: 0 st:-1 ts:0.624171 flags:1
 ret: 0 st: 0 dts:0.624172 pts:0.624172 pos:55096 size:4096 flags:1
-ret:-1 st: 0 ts:-0.481655 flags:0
+ret: 0 st: 0 ts:-0.481655 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st: 0 ts:2.412494 flags:1
 ret:-5
 ret: 0 st:-1 ts:1.306672 flags:0
 ret:-5
 ret: 0 st:-1 ts:0.200839 flags:1
 ret: 0 st: 0 dts:0.200839 pts:0.200839 pos:17758 size:4096 flags:1
-ret:-1 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 ts:-0.904989 flags:0
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st: 0 ts:1.989184 flags:1
 ret:-5
 ret: 0 st:-1 ts:0.883340 flags:0
 ret: 0 st: 0 dts:0.883333 pts:0.883333 pos:77954 size:4096 flags:1
-ret:-1 st:-1 ts:-0.222493 flags:1
+ret: 0 st:-1 ts:-0.222493 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ret: 0 st: 0 ts:2.671678 flags:0
 ret:-5
 ret: 0 st: 0 ts:1.565850 flags:1
 ret:-5
 ret: 0 st:-1 ts:0.460008 flags:0
 ret: 0 st: 0 dts:0.460000 pts:0.460000 pos:40616 size:4096 flags:1
-ret:-1 st:-1 ts:-0.645825 flags:1
+ret: 0 st:-1 ts:-0.645825 flags:1
+ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:44 size:4096 flags:1
 ----------------
 tests/data/b-libav.y4m
 ret: 0 st: 0 dts:0.000000 pts:0.000000 pos:66 size:152064 flags:1



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