fate: add test for tremolo filter

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

tests/fate/filter-audio.mak

@@ -122,6 +122,11 @@ FATE_AFILTER_SAMPLES-$(call FILTERDEMDECENCMUX, STEREOTOOLS, WAV, PCM_S16LE, PCM
 fate-filter-stereotools: SRC = $(TARGET_SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav
 fate-filter-stereotools: CMD = framecrc -i $(SRC) -aframes 20 -af stereotools=mlev=0.015625
 
+FATE_AFILTER-$(call FILTERDEMDECENCMUX, TREMOLO, WAV, PCM_S16LE, PCM_S16LE, WAV) += fate-filter-tremolo
+fate-filter-tremolo: tests/data/asynth-44100-2.wav
+fate-filter-tremolo: SRC = $(TARGET_PATH)/tests/data/asynth-44100-2.wav
+fate-filter-tremolo: CMD = framecrc -i $(SRC) -aframes 20 -af tremolo
+
 tests/data/hls-list.m3u8: TAG = GEN
 tests/data/hls-list.m3u8: ffmpeg$(PROGSSUF)$(EXESUF) | tests/data
 	$(M)$(TARGET_EXEC) $(TARGET_PATH)/$< \

tests/ref/fate/filter-tremolo

@@ -0,0 +1,25 @@
+#tb 0: 1/44100
+#media_type 0: audio
+#codec_id 0: pcm_s16le
+#sample_rate 0: 44100
+#channel_layout 0: 3
+0,          0,          0,     1024,     4096, 0x5d3be907
+0,       1024,       1024,     1024,     4096, 0xea151fbe
+0,       2048,       2048,     1024,     4096, 0xa5bc19f4
+0,       3072,       3072,     1024,     4096, 0x8706ec6d
+0,       4096,       4096,     1024,     4096, 0x334ff275
+0,       5120,       5120,     1024,     4096, 0xcd0ff7ad
+0,       6144,       6144,     1024,     4096, 0x29a1e9c9
+0,       7168,       7168,     1024,     4096, 0x1d41e77f
+0,       8192,       8192,     1024,     4096, 0x99e7fe07
+0,       9216,       9216,     1024,     4096, 0x4bbf09ce
+0,      10240,      10240,     1024,     4096, 0x94600236
+0,      11264,      11264,     1024,     4096, 0xc8af0c9e
+0,      12288,      12288,     1024,     4096, 0x70eef88f
+0,      13312,      13312,     1024,     4096, 0xb222ec47
+0,      14336,      14336,     1024,     4096, 0x1071ee27
+0,      15360,      15360,     1024,     4096, 0x7c390bd2
+0,      16384,      16384,     1024,     4096, 0x68bdf655
+0,      17408,      17408,     1024,     4096, 0x810cfacb
+0,      18432,      18432,     1024,     4096, 0x9639e41f
+0,      19456,      19456,     1024,     4096, 0xa30be70f