libavcodec/atrac3plus.c:1079: error: Integer Overflow L2
  ([1, +oo] - 2):unsigned32 by call to `bitstream_read`.

libavcodec/atrac3plus.c:1079:13: Call
1077.     Atrac3pChanParams *ref_chan = &ctx->channels[0];
1078. 
1079.     switch (bitstream_read(bc, 2)) { /* switch according to coding mode */
                  ^
1080.     case 0: /* fixed-length coding */
1081.         for (sb = 0; sb < coded_subbands; sb++)

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] - 2):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 decode_gainc_levels(BitstreamContext *bc, Atrac3pChanUnitCtx *ctx,\n                               int ch_num, int coded_subbands)\n{\n    int sb, i, delta, delta_bits, min_val, pred;\n    Atrac3pChanParams *chan     = &ctx->channels[ch_num];\n    Atrac3pChanParams *ref_chan = &ctx->channels[0];\n    switch (bitstream_read(bc, 2)) {\n    case 0:\n        for (sb = 0; sb < coded_subbands; sb++)\n            for (i = 0; i < chan->gain_data[sb].num_points; i++)\n                chan->gain_data[sb].lev_code[i] = bitstream_read(bc, 4);\n        break;\n    case 1:\n        if (ch_num) {\n            for (sb = 0; sb < coded_subbands; sb++)\n                for (i = 0; i < chan->gain_data[sb].num_points; i++) {\n                    delta = bitstream_read_vlc(bc, gain_vlc_tabs[5].table,\n                                               gain_vlc_tabs[5].bits, 1);\n                    pred = (i >= ref_chan->gain_data[sb].num_points)\n                           ? 7 : ref_chan->gain_data[sb].lev_code[i];\n                    chan->gain_data[sb].lev_code[i] = (pred + delta) & 0xF;\n                }\n        } else {\n            for (sb = 0; sb < coded_subbands; sb++)\n                gainc_level_mode1m(bc, ctx, &chan->gain_data[sb]);\n        }\n        break;\n    case 2:\n        if (ch_num) {\n            for (sb = 0; sb < coded_subbands; sb++)\n                if (chan->gain_data[sb].num_points > 0) {\n                    if (bitstream_read_bit(bc))\n                        gainc_level_mode1m(bc, ctx, &chan->gain_data[sb]);\n                    else\n                        gainc_level_mode3s(&chan->gain_data[sb],\n                                           &ref_chan->gain_data[sb]);\n                }\n        } else {\n            if (chan->gain_data[0].num_points > 0)\n                gainc_level_mode1m(bc, ctx, &chan->gain_data[0]);\n            for (sb = 1; sb < coded_subbands; sb++)\n                for (i = 0; i < chan->gain_data[sb].num_points; i++) {\n                    delta = bitstream_read_vlc(bc, gain_vlc_tabs[4].table,\n                                               gain_vlc_tabs[4].bits, 1);\n                    pred = (i >= chan->gain_data[sb - 1].num_points)\n                           ? 7 : chan->gain_data[sb - 1].lev_code[i];\n                    chan->gain_data[sb].lev_code[i] = (pred + delta) & 0xF;\n                }\n        }\n        break;\n    case 3:\n        if (ch_num) {\n            for (sb = 0; sb < coded_subbands; sb++)\n                gainc_level_mode3s(&chan->gain_data[sb],\n                                   &ref_chan->gain_data[sb]);\n        } else {\n            delta_bits = bitstream_read(bc, 2);\n            min_val    = bitstream_read(bc, 4);\n            for (sb = 0; sb < coded_subbands; sb++)\n                for (i = 0; i < chan->gain_data[sb].num_points; i++) {\n                    chan->gain_data[sb].lev_code[i] = min_val + bitstream_read(bc, delta_bits);\n                    if (chan->gain_data[sb].lev_code[i] > 15)\n                        return AVERROR_INVALIDDATA;\n                }\n        }\n        break;\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}']