libavcodec/tscc2.c:178: error: Integer Overflow L2
  ([1, +oo] - 12):unsigned32 by call to `bitstream_read`.

libavcodec/tscc2.c:178:26: Call
176.                     return AVERROR_INVALIDDATA;
177.                 if (ac == 0x1000)
178.                     ac = bitstream_read(bc, 12);
                              ^
179.                 bpos += ac & 0xF;
180.                 if (bpos >= 16)

libavcodec/bitstream.h:183:1: Parameter `n`
  181. 
  182. /* Return n bits from the buffer. n has to be in the 0-32 range. */
  183. static inline uint32_t bitstream_read(BitstreamContext *bc, unsigned n)
       ^
  184. {
  185.     if (!n)

libavcodec/bitstream.h:194:12: Call
  192.     }
  193. 
  194.     return get_val(bc, n);
                  ^
  195. }
  196. 

libavcodec/bitstream.h:130:1: <LHS trace>
128. }
129. 
130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
     ^
131. {
132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: Parameter `bc->bits_left`
    128. }
    129. 
    130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
         ^
    131. {
    132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: <RHS trace>
128. }
129. 
130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
     ^
131. {
132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: Parameter `n`
    128. }
    129. 
    130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
         ^
    131. {
    132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:139:5: Binary operation: ([1, +oo] - 12):unsigned32 by call to `bitstream_read` 
    137.     bc->bits <<= n;
    138. #endif
    139.     bc->bits_left -= n;
             ^
    140. 
    141.     return ret;

static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
{
#ifdef BITSTREAM_READER_LE
    uint64_t ret = bc->bits & ((UINT64_C(1) << n) - 1);
    bc->bits >>= n;
#else
    uint64_t ret = bc->bits >> (64 - n);
    bc->bits <<= n;
#endif
    bc->bits_left -= n;
    return ret;
}
['static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set,\n                           uint8_t *dst, int stride, int plane)\n{\n    BitstreamContext *bc = &c->bc;\n    int prev_dc, dc, nc, ac, bpos, val;\n    int i, j, k, l;\n    if (bitstream_read_bit(bc)) {\n        if (bitstream_read_bit(bc)) {\n            val = bitstream_read(bc, 8);\n            for (i = 0; i < 8; i++, dst += stride)\n                memset(dst, val, 16);\n        } else {\n            if (bitstream_bits_left(bc) < 16 * 8 * 8)\n                return AVERROR_INVALIDDATA;\n            for (i = 0; i < 8; i++) {\n                for (j = 0; j < 16; j++)\n                    dst[j] = bitstream_read(bc, 8);\n                dst += stride;\n            }\n        }\n        return 0;\n    }\n    prev_dc = 0;\n    for (j = 0; j < 2; j++) {\n        for (k = 0; k < 4; k++) {\n            if (!(j | k)) {\n                dc = bitstream_read(bc, 8);\n            } else {\n                dc = bitstream_read_vlc(bc, c->dc_vlc.table, 9, 2);\n                if (dc == -1)\n                    return AVERROR_INVALIDDATA;\n                if (dc == 0x100)\n                    dc = bitstream_read(bc, 8);\n            }\n            dc          = (dc + prev_dc) & 0xFF;\n            prev_dc     = dc;\n            c->block[0] = dc;\n            nc = bitstream_read_vlc(bc, c->nc_vlc[vlc_set].table, 9, 1);\n            if (nc == -1)\n                return AVERROR_INVALIDDATA;\n            bpos = 1;\n            memset(c->block + 1, 0, 15 * sizeof(*c->block));\n            for (l = 0; l < nc; l++) {\n                ac = bitstream_read_vlc(bc, c->ac_vlc[vlc_set].table, 9, 2);\n                if (ac == -1)\n                    return AVERROR_INVALIDDATA;\n                if (ac == 0x1000)\n                    ac = bitstream_read(bc, 12);\n                bpos += ac & 0xF;\n                if (bpos >= 16)\n                    return AVERROR_INVALIDDATA;\n                val = sign_extend(ac >> 4, 8);\n                c->block[ff_zigzag_scan[bpos++]] = val;\n            }\n            tscc2_idct4_put(c->block, q, dst + k * 4, stride);\n        }\n        dst += 4 * stride;\n    }\n    return 0;\n}', 'static inline uint32_t bitstream_read(BitstreamContext *bc, unsigned n)\n{\n    if (!n)\n        return 0;\n    if (n > bc->bits_left) {\n        refill_32(bc);\n        if (bc->bits_left < 32)\n            bc->bits_left = n;\n    }\n    return get_val(bc, n);\n}', 'static inline uint64_t get_val(BitstreamContext *bc, unsigned n)\n{\n#ifdef BITSTREAM_READER_LE\n    uint64_t ret = bc->bits & ((UINT64_C(1) << n) - 1);\n    bc->bits >>= n;\n#else\n    uint64_t ret = bc->bits >> (64 - n);\n    bc->bits <<= n;\n#endif\n    bc->bits_left -= n;\n    return ret;\n}']