avcodec/aacsbr_fixed: Fix multiple runtime error: left shift of negative value -407

Fixes: 1674/clusterfuzz-testcase-minimized-6092531563495424
Fixes: 1686/clusterfuzz-testcase-minimized-6282691643179008

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/aacdec_template.c

@@ -2800,9 +2800,9 @@ static void spectral_to_sample(AACContext *ac, int samples)
                     int j;
                     /* preparation for resampler */
                     for(j = 0; j<samples; j++){
-                        che->ch[0].ret[j] = (int32_t)av_clip64((int64_t)che->ch[0].ret[j]<<7, INT32_MIN, INT32_MAX-0x8000)+0x8000;
+                        che->ch[0].ret[j] = (int32_t)av_clip64((int64_t)che->ch[0].ret[j]*128, INT32_MIN, INT32_MAX-0x8000)+0x8000;
                         if(type == TYPE_CPE)
-                            che->ch[1].ret[j] = (int32_t)av_clip64((int64_t)che->ch[1].ret[j]<<7, INT32_MIN, INT32_MAX-0x8000)+0x8000;
+                            che->ch[1].ret[j] = (int32_t)av_clip64((int64_t)che->ch[1].ret[j]*128, INT32_MIN, INT32_MAX-0x8000)+0x8000;
                     }
                 }
 #endif /* USE_FIXED */

libavcodec/aacsbr_fixed.c

@@ -289,7 +289,7 @@ static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
         if (shift >= 3)
             alpha0[k][0] = 0x7fffffff;
         else {
-            a00.mant <<= 1;
+            a00.mant *= 2;
             shift = 2-shift;
             if (shift == 0)
                 alpha0[k][0] = a00.mant;
@@ -303,7 +303,7 @@ static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
         if (shift >= 3)
             alpha0[k][1] = 0x7fffffff;
         else {
-            a01.mant <<= 1;
+            a01.mant *= 2;
             shift = 2-shift;
             if (shift == 0)
                 alpha0[k][1] = a01.mant;
@@ -316,7 +316,7 @@ static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
         if (shift >= 3)
             alpha1[k][0] = 0x7fffffff;
         else {
-            a10.mant <<= 1;
+            a10.mant *= 2;
             shift = 2-shift;
             if (shift == 0)
                 alpha1[k][0] = a10.mant;
@@ -330,7 +330,7 @@ static void sbr_hf_inverse_filter(SBRDSPContext *dsp,
         if (shift >= 3)
             alpha1[k][1] = 0x7fffffff;
         else {
-            a11.mant <<= 1;
+            a11.mant *= 2;
             shift = 2-shift;
             if (shift == 0)
                 alpha1[k][1] = a11.mant;

libavcodec/sbrdsp_fixed.c

@@ -116,7 +116,7 @@ static av_always_inline SoftFloat autocorr_calc(int64_t accu)
         } else {
             nz = 0;
             while (FFABS(i) < 0x40000000) {
-                i <<= 1;
+                i *= 2;
                 nz++;
             }
             nz = 32-nz;
@@ -125,7 +125,7 @@ static av_always_inline SoftFloat autocorr_calc(int64_t accu)
         round = 1U << (nz-1);
         mant = (int)((accu + round) >> nz);
         mant = (mant + 0x40)>>7;
-        mant <<= 6;
+        mant *= 64;
         expo = nz + 15;
         return av_int2sf(mant, 30 - expo);
 }