libavcodec/on2avc.c:118: error: Integer Overflow L2
  ([1, +oo] - 4):unsigned32 by call to `bitstream_read`.

libavcodec/on2avc.c:118:21: Call
116. 
117.     while (band < num_bands) {
118.         band_type = bitstream_read(bc, 4);
                         ^
119.         run_len   = 1;
120.         do {

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] - 4):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 on2avc_decode_band_types(On2AVCContext *c, BitstreamContext *bc)\n{\n    int bits_per_sect = c->is_long ? 5 : 3;\n    int esc_val = (1 << bits_per_sect) - 1;\n    int num_bands = c->num_bands * c->num_windows;\n    int band = 0, i, band_type, run_len, run;\n    while (band < num_bands) {\n        band_type = bitstream_read(bc, 4);\n        run_len   = 1;\n        do {\n            run = bitstream_read(bc, bits_per_sect);\n            run_len += run;\n        } while (run == esc_val);\n        if (band + run_len > num_bands) {\n            av_log(c->avctx, AV_LOG_ERROR, "Invalid band type run\\n");\n            return AVERROR_INVALIDDATA;\n        }\n        for (i = band; i < band + run_len; i++) {\n            c->band_type[i]    = band_type;\n            c->band_run_end[i] = band + run_len;\n        }\n        band += run_len;\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}']