[FFmpeg-cvslog] avfilter/vf_ssim: Add support for writing stats to stdout

[Tobias Rapp]

ffmpeg | branch: master | Tobias Rapp <t.rapp at noa-audio.com> | Tue Oct 20 15:34:36 2015 +0200| [18e8fac531cb4b7db3d6d36b222c99e3e8968cfe] | committer: Michael Niedermayer

avfilter/vf_ssim: Add support for writing stats to stdout

Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=18e8fac531cb4b7db3d6d36b222c99e3e8968cfe
---

 doc/filters.texi      |    3 ++-
 libavfilter/vf_ssim.c |    6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index 486398d..6a1596e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -10226,7 +10226,8 @@ The description of the accepted parameters follows.
 @table @option
 @item stats_file, f
 If specified the filter will use the named file to save the SSIM of
-each individual frame.
+each individual frame. When filename equals "-" the data is sent to
+standard output.
 @end table
 
 The file printed if @var{stats_file} is selected, contains a sequence of
diff --git a/libavfilter/vf_ssim.c b/libavfilter/vf_ssim.c
index 5cd9361..b23d447 100644
--- a/libavfilter/vf_ssim.c
+++ b/libavfilter/vf_ssim.c
@@ -223,7 +223,9 @@ static av_cold int init(AVFilterContext *ctx)
 {
     SSIMContext *s = ctx->priv;
 
-    if (s->stats_file_str) {
+    if (!strcmp(s->stats_file_str, "-")) {
+        s->stats_file = stdout;
+    } else if (s->stats_file_str) {
         s->stats_file = fopen(s->stats_file_str, "w");
         if (!s->stats_file) {
             int err = AVERROR(errno);
@@ -354,7 +356,7 @@ static av_cold void uninit(AVFilterContext *ctx)
 
     ff_dualinput_uninit(&s->dinput);
 
-    if (s->stats_file)
+    if (s->stats_file && s->stats_file != stdout)
         fclose(s->stats_file);
 
     av_freep(&s->temp);