libavcodec/atrac3plus.c:1374: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `bitstream_read_bit`.

libavcodec/atrac3plus.c:1373:30: Call
1371. 
1372.         if (bitstream_read_bit(bc)) { /* gain control data present? */
1373.             coded_subbands = bitstream_read(bc, 4) + 1;
                                   ^
1374.             if (bitstream_read_bit(bc)) /* is high band gain data replication on? */
1375.                 ctx->channels[ch_num].num_gain_subbands = bitstream_read(bc, 4) + 1;

libavcodec/bitstream.h:183:1: Parameter `bc->bits_left`
  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/atrac3plus.c:1374:17: Call
1372.         if (bitstream_read_bit(bc)) { /* gain control data present? */
1373.             coded_subbands = bitstream_read(bc, 4) + 1;
1374.             if (bitstream_read_bit(bc)) /* is high band gain data replication on? */
                      ^
1375.                 ctx->channels[ch_num].num_gain_subbands = bitstream_read(bc, 4) + 1;
1376.             else

libavcodec/bitstream.h:145:1: Parameter `bc->bits_left`
  143. 
  144. /* Return one bit from the buffer. */
  145. static inline unsigned bitstream_read_bit(BitstreamContext *bc)
       ^
  146. {
  147.     if (!bc->bits_left)

libavcodec/bitstream.h:150:12: Call
  148.         refill_64(bc);
  149. 
  150.     return get_val(bc, 1);
                  ^
  151. }
  152. 

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: ([0, +oo] - 1):unsigned32 by call to `bitstream_read_bit` 
    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_data(BitstreamContext *bc, Atrac3pChanUnitCtx *ctx,\n                             int num_channels, AVCodecContext *avctx)\n{\n    int ch_num, coded_subbands, sb, ret;\n    for (ch_num = 0; ch_num < num_channels; ch_num++) {\n        memset(ctx->channels[ch_num].gain_data, 0,\n               sizeof(*ctx->channels[ch_num].gain_data) * ATRAC3P_SUBBANDS);\n        if (bitstream_read_bit(bc)) {\n            coded_subbands = bitstream_read(bc, 4) + 1;\n            if (bitstream_read_bit(bc))\n                ctx->channels[ch_num].num_gain_subbands = bitstream_read(bc, 4) + 1;\n            else\n                ctx->channels[ch_num].num_gain_subbands = coded_subbands;\n            if ((ret = decode_gainc_npoints(bc, ctx, ch_num, coded_subbands)) < 0 ||\n                (ret = decode_gainc_levels(bc, ctx, ch_num, coded_subbands))  < 0 ||\n                (ret = decode_gainc_loc_codes(bc, ctx, ch_num, coded_subbands, avctx)) < 0)\n                return ret;\n            if (coded_subbands > 0) {\n                for (sb = coded_subbands; sb < ctx->channels[ch_num].num_gain_subbands; sb++)\n                    ctx->channels[ch_num].gain_data[sb] =\n                        ctx->channels[ch_num].gain_data[sb - 1];\n            }\n        } else {\n            ctx->channels[ch_num].num_gain_subbands = 0;\n        }\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 unsigned bitstream_read_bit(BitstreamContext *bc)\n{\n    if (!bc->bits_left)\n        refill_64(bc);\n    return get_val(bc, 1);\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}']