libavcodec/mpc7.c:121: error: Integer Overflow L2
  ([0, 1020] - 510):unsigned32.

libavcodec/mpc7.c:115:1: <LHS trace>
113.  * Fill samples for given subband
114.  */
115. static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
     ^
116. {
117.     int i, i1, t;

libavcodec/mpc7.c:115:1: Parameter `c->rnd.state[*]`
113.  * Fill samples for given subband
114.  */
115. static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
     ^
116. {
117.     int i, i1, t;

libavcodec/mpc7.c:121:23: Call
119.     case -1:
120.         for(i = 0; i < SAMPLES_PER_BAND; i++){
121.             *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
                           ^
122.         }
123.         break;

libavutil/lfg.h:38:1: Parameter `c->state[*]`
  36.  * it may be good enough and faster for your specific use case.
  37.  */
  38. static inline unsigned int av_lfg_get(AVLFG *c){
      ^
  39.     c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
  40.     return c->state[c->index++ & 63];

libavutil/lfg.h:40:5: Assignment
  38. static inline unsigned int av_lfg_get(AVLFG *c){
  39.     c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
  40.     return c->state[c->index++ & 63];
          ^
  41. }
  42. 

libavcodec/mpc7.c:121:13: Binary operation: ([0, 1020] - 510):unsigned32
119.     case -1:
120.         for(i = 0; i < SAMPLES_PER_BAND; i++){
121.             *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
                 ^
122.         }
123.         break;

static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
{
    int i, i1, t;
    switch(idx){
    case -1:
        for(i = 0; i < SAMPLES_PER_BAND; i++){
            *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
        }
        break;
    case 1:
        i1 = get_bits1(gb);
        for(i = 0; i < SAMPLES_PER_BAND/3; i++){
            t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
            *dst++ = mpc7_idx30[t];
            *dst++ = mpc7_idx31[t];
            *dst++ = mpc7_idx32[t];
        }
        break;
    case 2:
        i1 = get_bits1(gb);
        for(i = 0; i < SAMPLES_PER_BAND/2; i++){
            t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
            *dst++ = mpc7_idx50[t];
            *dst++ = mpc7_idx51[t];
        }
        break;
    case  3: case  4: case  5: case  6: case  7:
        i1 = get_bits1(gb);
        for(i = 0; i < SAMPLES_PER_BAND; i++)
            *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
        break;
    case  8: case  9: case 10: case 11: case 12:
    case 13: case 14: case 15: case 16: case 17:
        t = (1 << (idx - 2)) - 1;
        for(i = 0; i < SAMPLES_PER_BAND; i++)
            *dst++ = get_bits(gb, idx - 1) - t;
        break;
    default:
        return;
    }
}
['static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)\n{\n    int i, i1, t;\n    switch(idx){\n    case -1:\n        for(i = 0; i < SAMPLES_PER_BAND; i++){\n            *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;\n        }\n        break;\n    case 1:\n        i1 = get_bits1(gb);\n        for(i = 0; i < SAMPLES_PER_BAND/3; i++){\n            t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);\n            *dst++ = mpc7_idx30[t];\n            *dst++ = mpc7_idx31[t];\n            *dst++ = mpc7_idx32[t];\n        }\n        break;\n    case 2:\n        i1 = get_bits1(gb);\n        for(i = 0; i < SAMPLES_PER_BAND/2; i++){\n            t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);\n            *dst++ = mpc7_idx50[t];\n            *dst++ = mpc7_idx51[t];\n        }\n        break;\n    case  3: case  4: case  5: case  6: case  7:\n        i1 = get_bits1(gb);\n        for(i = 0; i < SAMPLES_PER_BAND; i++)\n            *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];\n        break;\n    case  8: case  9: case 10: case 11: case 12:\n    case 13: case 14: case 15: case 16: case 17:\n        t = (1 << (idx - 2)) - 1;\n        for(i = 0; i < SAMPLES_PER_BAND; i++)\n            *dst++ = get_bits(gb, idx - 1) - t;\n        break;\n    default:\n        return;\n    }\n}', 'static inline unsigned int av_lfg_get(AVLFG *c){\n    c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];\n    return c->state[c->index++ & 63];\n}']