libavcodec/interplayvideo.c:904: error: Integer Overflow L2
  ([1, +oo] - 4):unsigned32 by call to `bitstream_read`.

libavcodec/interplayvideo.c:904:22: Call
902.     for (y = 0; y < s->avctx->height; y += 8) {
903.         for (x = 0; x < s->avctx->width; x += 8) {
904.             opcode = bitstream_read(&bc, 4);
                          ^
905. 
906.             ff_dlog(s->avctx,

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 void ipvideo_decode_opcodes(IpvideoContext *s, AVFrame *frame)\n{\n    int x, y;\n    unsigned char opcode;\n    int ret;\n    BitstreamContext bc;\n    bytestream2_skip(&s->stream_ptr, 14);\n    if (!s->is_16bpp) {\n        memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);\n        s->stride = frame->linesize[0];\n    } else {\n        s->stride = frame->linesize[0] >> 1;\n        s->mv_ptr = s->stream_ptr;\n        bytestream2_skip(&s->mv_ptr, bytestream2_get_le16(&s->stream_ptr));\n    }\n    s->line_inc = s->stride - 8;\n    s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0]\n                                  + (s->avctx->width - 8) * (1 + s->is_16bpp);\n    bitstream_init(&bc, s->decoding_map, s->decoding_map_size * 8);\n    for (y = 0; y < s->avctx->height; y += 8) {\n        for (x = 0; x < s->avctx->width; x += 8) {\n            opcode = bitstream_read(&bc, 4);\n            ff_dlog(s->avctx,\n                    "  block @ (%3d, %3d): encoding 0x%X, data ptr offset %d\\n",\n                    x, y, opcode, bytestream2_tell(&s->stream_ptr));\n            if (!s->is_16bpp) {\n                s->pixel_ptr = frame->data[0] + x\n                              + y*frame->linesize[0];\n                ret = ipvideo_decode_block[opcode](s, frame);\n            } else {\n                s->pixel_ptr = frame->data[0] + x*2\n                              + y*frame->linesize[0];\n                ret = ipvideo_decode_block16[opcode](s, frame);\n            }\n            if (ret != 0) {\n                av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\\n",\n                       s->avctx->frame_number, x, y);\n                return;\n            }\n        }\n    }\n    if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) {\n        av_log(s->avctx, AV_LOG_ERROR,\n               "Interplay video: decode finished with %d bytes left over\\n",\n               bytestream2_get_bytes_left(&s->stream_ptr));\n    }\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}']