libavcodec/ralf.c:361: error: Integer Overflow L2
  ([1, +oo] - 2):unsigned32 by call to `bitstream_read`.

libavcodec/ralf.c:361:17: Call
359. 
360.     if (avctx->channels > 1)
361.         dmode = bitstream_read(bc, 2) + 1;
                     ^
362.     else
363.         dmode = 0;

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_block(AVCodecContext *avctx, BitstreamContext *bc,\n                        int16_t *dst0, int16_t *dst1)\n{\n    RALFContext *ctx = avctx->priv_data;\n    int len, ch, ret;\n    int dmode, mode[2], bits[2];\n    int *ch0, *ch1;\n    int i, t, t2;\n    len = 12 - get_unary(bc, 0, 6);\n    if (len <= 7) len ^= 1;\n    len = 1 << len;\n    if (ctx->sample_offset + len > ctx->max_frame_size) {\n        av_log(avctx, AV_LOG_ERROR,\n               "Decoder\'s stomach is crying, it ate too many samples\\n");\n        return AVERROR_INVALIDDATA;\n    }\n    if (avctx->channels > 1)\n        dmode = bitstream_read(bc, 2) + 1;\n    else\n        dmode = 0;\n    mode[0] = (dmode == 4) ? 1 : 0;\n    mode[1] = (dmode >= 2) ? 2 : 0;\n    bits[0] = 16;\n    bits[1] = (mode[1] == 2) ? 17 : 16;\n    for (ch = 0; ch < avctx->channels; ch++) {\n        if ((ret = decode_channel(ctx, bc, ch, len, mode[ch], bits[ch])) < 0)\n            return ret;\n        if (ctx->filter_params > 1 && ctx->filter_params != FILTER_RAW) {\n            ctx->filter_bits += 3;\n            apply_lpc(ctx, ch, len, bits[ch]);\n        }\n        if (bitstream_bits_left(bc) < 0)\n            return AVERROR_INVALIDDATA;\n    }\n    ch0 = ctx->channel_data[0];\n    ch1 = ctx->channel_data[1];\n    switch (dmode) {\n    case 0:\n        for (i = 0; i < len; i++)\n            dst0[i] = ch0[i] + ctx->bias[0];\n        break;\n    case 1:\n        for (i = 0; i < len; i++) {\n            dst0[i] = ch0[i] + ctx->bias[0];\n            dst1[i] = ch1[i] + ctx->bias[1];\n        }\n        break;\n    case 2:\n        for (i = 0; i < len; i++) {\n            ch0[i] += ctx->bias[0];\n            dst0[i] = ch0[i];\n            dst1[i] = ch0[i] - (ch1[i] + ctx->bias[1]);\n        }\n        break;\n    case 3:\n        for (i = 0; i < len; i++) {\n            t  = ch0[i] + ctx->bias[0];\n            t2 = ch1[i] + ctx->bias[1];\n            dst0[i] = t + t2;\n            dst1[i] = t;\n        }\n        break;\n    case 4:\n        for (i = 0; i < len; i++) {\n            t  =   ch1[i] + ctx->bias[1];\n            t2 = ((ch0[i] + ctx->bias[0]) << 1) | (t & 1);\n            dst0[i] = (t2 + t) / 2;\n            dst1[i] = (t2 - t) / 2;\n        }\n        break;\n    }\n    ctx->sample_offset += len;\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}']