avcodec/atrac1: fix decoder: QMF delay compensation should be 39 samples

This also adds a new fate test

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

libavcodec/atrac1.c

@@ -65,7 +65,7 @@ typedef struct AT1SUCtx {
     DECLARE_ALIGNED(32, float, spec2)[AT1_SU_SAMPLES];     ///< mdct buffer
     DECLARE_ALIGNED(32, float, fst_qmf_delay)[46];         ///< delay line for the 1st stacked QMF filter
     DECLARE_ALIGNED(32, float, snd_qmf_delay)[46];         ///< delay line for the 2nd stacked QMF filter
-    DECLARE_ALIGNED(32, float, last_qmf_delay)[256+23];    ///< delay line for the last stacked QMF filter
+    DECLARE_ALIGNED(32, float, last_qmf_delay)[256+39];    ///< delay line for the last stacked QMF filter
 } AT1SUCtx;
 
 /**
@@ -260,9 +260,9 @@ static void at1_subband_synthesis(AT1Ctx *q, AT1SUCtx* su, float *pOut)
     /* combine low and middle bands */
     ff_atrac_iqmf(q->bands[0], q->bands[1], 128, temp, su->fst_qmf_delay, iqmf_temp);
 
-    /* delay the signal of the high band by 23 samples */
-    memcpy( su->last_qmf_delay,    &su->last_qmf_delay[256], sizeof(float) *  23);
-    memcpy(&su->last_qmf_delay[23], q->bands[2],             sizeof(float) * 256);
+    /* delay the signal of the high band by 39 samples */
+    memcpy( su->last_qmf_delay,    &su->last_qmf_delay[256], sizeof(float) *  39);
+    memcpy(&su->last_qmf_delay[39], q->bands[2],             sizeof(float) * 256);
 
     /* combine (low + middle) and high bands */
     ff_atrac_iqmf(temp, su->last_qmf_delay, 256, pOut, su->snd_qmf_delay, iqmf_temp);

tests/fate/atrac.mak

@@ -1,6 +1,13 @@
-FATE_ATRAC1-$(call DEMDEC, AEA, ATRAC1) += fate-atrac1
-fate-atrac1: CMD = pcm -i $(TARGET_SAMPLES)/atrac1/test_tones_small.aea
-fate-atrac1: REF = $(SAMPLES)/atrac1/test_tones_small.pcm
+FATE_ATRAC1 += fate-atrac1-1
+fate-atrac1-1: CMD = pcm -i $(TARGET_SAMPLES)/atrac1/test_tones_small.aea
+fate-atrac1-1: REF = $(SAMPLES)/atrac1/test_tones_small_fixed_delay.pcm
+
+FATE_ATRAC1 += fate-atrac1-2
+fate-atrac1-2: CMD = pcm -i $(TARGET_SAMPLES)/atrac1/chirp_tone_10-16000.aea
+fate-atrac1-2: REF = $(SAMPLES)/atrac1/chirp_tone_10-16000.pcm
+fate-atrac1-2: FUZZ = 61
+
+FATE_ATRAC1-$(call DEMDEC, AEA, ATRAC1) += $(FATE_ATRAC1)
 
 FATE_ATRAC3 += fate-atrac3-1
 fate-atrac3-1: CMD = pcm -i $(TARGET_SAMPLES)/atrac3/mc_sich_at3_066_small.wav