[FFmpeg-cvslog] swresample/resample: increase precision for compensation

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed Nov 11 16:49:21 2015 +0100| [351e625d60165be67c362af6e96ead6c9262623f] | committer: Michael Niedermayer

swresample/resample: increase precision for compensation

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=351e625d60165be67c362af6e96ead6c9262623f
---

 libswresample/resample.c     |    4 ++++
 tests/fate/libswresample.mak |    8 ++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/libswresample/resample.c b/libswresample/resample.c
index c5ee62d..77f3a0d 100644
--- a/libswresample/resample.c
+++ b/libswresample/resample.c
@@ -355,6 +355,10 @@ static ResampleContext *resample_init(ResampleContext *c, int out_rate, int in_r
     c->compensation_distance= 0;
     if(!av_reduce(&c->src_incr, &c->dst_incr, out_rate, in_rate * (int64_t)phase_count, INT32_MAX/2))
         goto error;
+    while (c->dst_incr < (1<<20) && c->src_incr < (1<<20)) {
+        c->dst_incr *= 2;
+        c->src_incr *= 2;
+    }
     c->ideal_dst_incr = c->dst_incr;
     c->dst_incr_div   = c->dst_incr / c->src_incr;
     c->dst_incr_mod   = c->dst_incr % c->src_incr;
diff --git a/tests/fate/libswresample.mak b/tests/fate/libswresample.mak
index e48170d..064c0f6 100644
--- a/tests/fate/libswresample.mak
+++ b/tests/fate/libswresample.mak
@@ -366,16 +366,16 @@ fate-swr-resample_async-$(3)-$(1)-$(2): FUZZ = 0.1
 fate-swr-resample_async-$(3)-$(1)-$(2): REF = tests/data/asynth-$(1)-1.wav
 endef
 
-fate-swr-resample_async-fltp-44100-8000: CMP_TARGET = 4031.48
+fate-swr-resample_async-fltp-44100-8000: CMP_TARGET = 4020.62
 fate-swr-resample_async-fltp-44100-8000: SIZE_TOLERANCE = 529200 - 20310
 
-fate-swr-resample_async-fltp-8000-44100: CMP_TARGET = 11185.34
+fate-swr-resample_async-fltp-8000-44100: CMP_TARGET = 11186.69
 fate-swr-resample_async-fltp-8000-44100: SIZE_TOLERANCE = 96000 - 20344
 
-fate-swr-resample_async-s16p-44100-8000: CMP_TARGET = 4031.59
+fate-swr-resample_async-s16p-44100-8000: CMP_TARGET = 4020.73
 fate-swr-resample_async-s16p-44100-8000: SIZE_TOLERANCE = 529200 - 20310
 
-fate-swr-resample_async-s16p-8000-44100: CMP_TARGET = 11185.65
+fate-swr-resample_async-s16p-8000-44100: CMP_TARGET = 11187.01
 fate-swr-resample_async-s16p-8000-44100: SIZE_TOLERANCE = 96000 - 20344
 
 $(call CROSS_TEST,$(SAMPLERATES),ARESAMPLE,s16p,s16le,s16)