}
void init_get_bits(GetBitContext *s,                   const uint8_t *buffer, int bit_size){    const int buffer_size= (bit_size+7)>>3;    s->buffer= buffer;    s->size_in_bits= bit_size;    s->buffer_end= buffer + buffer_size;#ifdef ALT_BITSTREAM_READER    s->index=0;#elif defined LIBMPEG2_BITSTREAM_READER    s->buffer_ptr = buffer;    s->bit_count = 16;    s->cache = 0;#elif defined A32_BITSTREAM_READER    s->buffer_ptr = (uint32_t*)buffer;    s->bit_count = 32;    s->cache0 = 0;    s->cache1 = 0;#endif    {        OPEN_READER(re, s)        UPDATE_CACHE(re, s)//        UPDATE_CACHE(re, s)        CLOSE_READER(re, s)    }#ifdef A32_BITSTREAM_READER    s->cache1 = 0;#endif}