[FFmpeg-devel] [PATCH] af_pan: comment a tricky piece of code.

[Nicolas George]

Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
 libavfilter/af_pan.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)


I wrote it and I had trouble remembering what it did...


diff --git a/libavfilter/af_pan.c b/libavfilter/af_pan.c
index 9f293a6..0280ab2 100644
--- a/libavfilter/af_pan.c
+++ b/libavfilter/af_pan.c
@@ -66,6 +66,7 @@ static int parse_channel_name(char **arg, int *rchannel, int *rnamed)
 
     if (sscanf(*arg, " %7[A-Z] %n", buf, &len)) {
         layout0 = layout = av_get_channel_layout(buf);
+        /* channel_id <- first set bit in layout */
         for (i = 32; i > 0; i >>= 1) {
             if (layout >= (int64_t)1 << i) {
                 channel_id += i;
-- 
1.7.9